JET PUMP

Abstract

 The present disclosure provides a jet pump, including a pump body provided with a water inlet and a water outlet. A jet tube and an impeller are provided in the pump body. Fluid passes through the water inlet, the jet tube, the impeller, and the water outlet in sequence. At least one flow-increasing channel is provided at the outer periphery of the jet tube. The flow-increasing channel is provided around the outside of the jet tube. The flow-increasing channel is in communication with the water inlet and an inlet of the impeller. Fluid passing through the flow-increasing channel is thrown to the pressurizing chamber by the impeller. The flow-increasing channel is provided with a valve core. The movement of the valve core in the flow-increasing channel causes the flow-increasing channel to be opened or closed. A cavitation problem is relieved by providing the flow-increasing channel, and the present disclosure has a simple production process and a low production cost.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of jet pumps and, in particular, to a jet pump.

BACKGROUND

[0002] A water pump is a device configured to convey liquid, including a motor and a pump body. The pump body is provided with a water inlet, a water inlet channel, a pressurizing chamber, a water outlet channel, and a water outlet. An impeller is provided in the pressurizing chamber. The water inlet is connected to the water inlet channel. The water outlet is connected to the water outlet channel. The pressurizing chamber is connected to the water inlet channel and the water outlet channel, respectively. The motor drives the impeller to rotate at a high speed, and external water flow passes through the water inlet and the water inlet channel in sequence to enter the pressurizing chamber. A high-pressure water flow is formed by the pressurization of the impeller, enters the water outlet channel, and then is discharged from the water outlet. With the continuous discharge of the fluid inside the impeller, a low-pressure area is gradually formed at the center of the impeller, and the low-pressure area even reaches a vacuum. At this time, under the action of atmospheric pressure, the fluid at the inlet of the water pump continuously flows into the impeller through the water inlet and is thrown out by the impeller. In this process, the mechanical energy of the pump shaft is transmitted to the fluid by the impeller, transforming into pressure energy and kinetic energy of the fluid, wherein the pressure energy and kinetic energy of the fluid are reflected as the lift output of the water pump.

[0003] Specifically, the performance of the water pump depends on two parameters, namely lift and flow. The curve relation between lift and flow is inversely proportional, that is, if the lift is high, then the flow is small, while if the lift is low, then the flow is large. In addition, a flow of the water pump is limited by water inlet channel, that is, the size of the water inlet channel directly affects the upper limit value of the flow of the water pump. The performance of the water pump degrades when a certain flow rate is reached. This effect is due to the formation of primary cavitation in the area around the jet nozzle at the opening of the venturi. It not only reduces the lift and efficiency of the water pump but also causes problems, such as vibration, noise, and cavitation.

[0004] In order to control cavitation or alleviate the damage caused by cavitation, the main measures currently taken are the optimization of the inlet of the impeller, the optimization of the blade load, the installation of the inducer, the injection and pressurization of the inlet, and the adoption of the double suction structure to reduce the inlet flow rate of the pump and increase the inlet pressure of the pump so as to realize the control or alleviation of cavitation.

[0005] The Chinese patent application No. CN201910335203.9, entitled "FLOW-INCREASING WATER PUMP", discloses a pump body with a water inlet and a water outlet. A water inlet chamber, a pressurizing chamber, and a water flow channel are provided in the pump body. The water inlet chamber and the pressurizing chamber are further in communication with a flow-increasing channel. A one-way check mechanism is provided in the flow-increasing channel. When the liquid pressure in the water inlet chamber is higher than the liquid pressure in the pressurizing chamber, the one-way check mechanism switches on the flow-increasing channel. When the liquid pressure in the water inlet chamber is lower than the liquid pressure in the pressurizing chamber, the one-way check mechanism blocks the flow-increasing channel. According to the flow-increasing water pump patent, the structural design of the pump body is reasonably improved, the flow-increasing channel is additionally provided between the water inlet chamber and the pressurizing chamber, and the flowing or blocking of the liquid flow in the flow-increasing channel is controlled according to the pressure change between the pressurizing chamber and the water inlet chamber in the pump body by means of the one-way check mechanism, such that the curve relation diagram of the flow and the lift of the water pump is optimized, and the performance of the water pump is significantly improved.

[0006] However, the above-mentioned patent application has the following problems: The one-way check mechanism is provided in the narrow flow-increasing channel. The one-way check mechanism includes a partition plate, a guide sleeve, a movable rod, a movable baffle, a compression spring, and others. The one-way check mechanism has a complex structure and a high production cost and is difficult to assemble and is easily damaged during use.

SUMMARY

[0007] A technical problem to be solved by the present disclosure is to provide a jet pump to relieve the cavitation problem by arranging a flow-increasing channel, which has a simple production process and a low production cost.

[0008] A technical solution adopted by the present disclosure is as follows: A jet pump includes a pump body provided with a water inlet and a water outlet. A jet tube and an impeller are provided in the pump body. Fluid passes through the water inlet, the jet tube, the impeller, and the water outlet in sequence. At least one flow-increasing channel is provided at the outer periphery of the jet tube. The flow-increasing channel is provided around the outside of the jet tube. The flow-increasing channel is in communication with the water inlet and an inlet of the impeller. Fluid passing through the flow-increasing channel is thrown to the pressurizing chamber by the impeller. The flow-increasing channel is provided with a valve core. The movement of the valve core in the flow-increasing channel causes the flow-increasing channel to be opened or closed.

[0009] Compared with the prior art, the present disclosure has the advantages: with a flow-increasing channel provided at the outer periphery of the jet tube, the flow-increasing channel is in communication with the water inlet and the impeller, so the communication flow from the water outlet to the impeller can be increased.

[0010] When the jet pump is at a low lift, that is, when a pressure at the water inlet is greater than a predetermined pressure at the impeller, the flow-increasing channel is opened, which further increases the flow which is passed and thus effectively increases the upper limit value of the pump flow.

[0011] When the jet pump is at a low lift, that is, when a pressure at the water inlet is not greater than a predetermined pressure at the impeller, the flow-increasing channel is in a closed state. As a result, the water flow reaching the impeller decreases, and the upper limit value of the pump lift is effectively increased.

[0012] The present disclosure adopts the structure of the flow-increasing channel provided around the outside of the jet tube. Compared with the prior art, the overall volume of the entire jet pump does not increase significantly. In the present disclosure, only the valve core is provided in the flow-increasing channel, and other structures, such as a partition plate, a guide sleeve, a movable rod, a movable baffle, and a compression spring, are not involved. Therefore, compared with the prior art, the present disclosure has a simple production process and a low production cost.

[0013] When the pressure at the water inlet is greater than a predetermined pressure at the impeller, the movement of the valve core causes the flow-increasing channel to be opened.

[0014] In some embodiments of the present disclosure, a flow-increasing channel is provided at the outer periphery of the jet tube. A cross-section of the flow-increasing channel is a closed or open annular structure. The flow-increasing channel is provided around the outer periphery of the jet tube.

[0015] Preferably, the cross-section of the flow-increasing channel is an annular structure. The flow-increasing channel is sleeved outside the jet tube. The valve core is an annular structure which adapts to the cross-section of the flow-increasing channel.

[0016] Preferably, the valve core is made of an elastic material. The valve core can effectively block the valve port, thereby closing the flow-increasing channel. In the present embodiment, the structure of the valve core is similar to a sealing ring, which is a component with a simple and developed structure. Therefore, the production cost of the product is relatively low.

[0017] In addition, since the valve core is an annular structure, it is equivalent to that the valve core is sleeved outside the wall surface of the flow-increasing channel. During the movement of the valve core, the valve core is limited by the wall surface of the flow-increasing channel, so the movement is stable and reliable.

[0018] In the present embodiment, both the flow-increasing channel and the valve core are highly symmetrical structures. Therefore, during fluid passes through the flow-increasing channel or fluid acts on the valve core, the forces acting on the valve core are balanced, which also makes the working state of the valve core stable and reliable.

[0019] Specifically, a valve port is provided at a side of the flow-increasing channel, wherein the side of the flow-increasing channel is adjacent to the water inlet. The valve port is an annular structure or includes a plurality of regularly arranged rectangular, circular, or arc structures. When the structure of the valve port is provided, the above structures can all meet the water inlet requirements of the flow-increasing channel. The plurality of regularly arranged rectangular, circular, or arc structures can also realize the force balance of the valve core, thereby realizing the stable and reliable operation of the valve core.

[0020] In some embodiments of the present disclosure, a guide piece is provided at a wall surface of the flow-increasing channel, wherein the wall surface of the flow-increasing channel is adjacent to the valve port. The valve core located in the flow-increasing channel moves to the valve port through the guide piece. In the present disclosure, the guide piece is provided to ensure that the valve core can move to the position of the valve port stably and reliably so as to block the valve port.

[0021] In some embodiments of the present disclosure, a limiting piece is provided in the flow-increasing channel, and the valve core is located between the valve port and the limiting piece. The limiting piece limits the movement stroke of the valve core to prevent the movement path of the valve core from exceeding the limit when the force acting on the valve core is large. When the flow-increasing channel should be blocked, it is difficult for the valve core to move to the position of the valve port.

[0022] In some embodiments of the present disclosure, at least two flow-increasing channels are provided at the outer periphery of the jet tube, and the cross-section of the flow-increasing channel is circular or rectangular.

[0023] In some embodiments of the present disclosure, the cross-section of the flow-increasing channel is a curved line segment, and the at least two flow-increasing channels are arranged to form an annular structure.

[0024] In some embodiments of the present disclosure, a valve port is provided at a side of the flow-increasing channel, wherein the side of the flow-increasing channel is adjacent to the water inlet. The valve core provided in the flow-increasing channel is adapted to the structure of the valve port. When the valve core blocks the valve port, the flow-increasing channel is switched off.

[0025] Preferably, the valve port is adapted to the cross-section of the flow-increasing channel. The valve port is shaped as a circle, a rectangle, or a curved line segment. Correspondingly, the valve core is a block-shaped structural member whose cross-section is shaped as a circle, a rectangle, or a curved line segment.

[0026] Preferably, the valve core is made of an elastic material. The valve core can effectively block the valve port so as to close the flow-increasing channel.

[0027] In the above embodiments, the flow-increasing channel is typically a straight channel. The molding is simple and the production cost is low. Moreover, through the regular arrangement of two or more flow-increasing channels, the flow change can be increased without substantially increasing the volume of the jet pump.

[0028] In some embodiments of the present disclosure, a jet device is provided in the pump body. The jet device is made up of the jet tube, the water inlet tube, the pressurizing chamber, and the impeller.

[0029] The water inlet tube is connected to the water inlet. The water inlet tube is in communication with the jet tube as well as the valve port of the flow-increasing channel. The jet tube is in communication with the water inlet tube and pressurizing chamber. The flow-increasing channel is in communication with the water inlet tube and the pressurizing chamber. The pressurizing chamber is in communication with the water outlet of the pump body. Thus, the present disclosure realizes that the fluid enters the water inlet, passes through the water inlet tube, the jet tube, and the pressurizing chamber in sequence, and then is discharged from the water outlet of the pump body.

[0030] Whether the flow-increasing channel is in communication or not depends on a working state of a jet pump. If the flow-increasing channel is in communication, the fluid entering the water inlet tube will pass through the flow-increasing channel and then arrive at the pressurizing chamber.

[0031] In some embodiments of the present disclosure, the jet device includes a first casing, a second casing, a third casing, and a fourth casing.

[0032] The first casing and the second casing are connected to form the water inlet tube. A part of the jet tube and the valve port of the flow-increasing channel are located in the second casing.

[0033] A part of the jet tube and a part of the flow-increasing channel are located in the third casing. The second casing and the third casing form the jet tube, and the second casing and the third casing form the flow-increasing channel.

[0034] The third casing and the fourth casing form the pressurizing chamber.

[0035] In the present embodiment, the jet tube including the four parts can not only meet the general molding requirements but also facilitate the assembly of structures such as the valve core and the impeller. The assembly is the preferred structural arrangement of the present disclosure.

[0036] Specifically, the third casing is provided with an installation groove. The second casing is correspondingly provided with an installation portion. The installation portion is inserted into the installation groove. A sealing structure is provided between the second casing and the third casing. Specifically, the sealing structure may be a sealing member. The second casing and the third casing can be locked by bolts.

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present disclosure will be further described in detail below with reference to the drawings and preferred embodiments. However, those skilled in the art should understand that these drawings are drawn only for the purpose of explaining the preferred embodiments, and therefore should not be construed as a limitation to the scope of the present disclosure. In addition, unless otherwise specified, the drawings are only intended to conceptually represent the composition or configuration of the described objects. The drawings may be exaggerated and are not necessarily drawn to scale.

FIG. 1 is a schematic structural diagram of the jet pump of the present disclosure.

FIG. 2 is a side view of the jet pump of the present disclosure.

FIG. 3 is a sectional view taken along a cross-section A-A of FIG. 2.

FIG. 4 is a schematic structural diagram of a jet device.

FIG. 5 is an exploded schematic structural diagram I of the jet device.

FIG. 6 is an exploded schematic structural diagram II of the jet device.

FIG. 7 is a sectional view of Embodiment VI of the present disclosure.

[0038] Reference Numerals: 1, water inlet; 2, water outlet; 3, pump body; 4, jet tube; 5, impeller; 6, flow-increasing channel; 7, valve core; 8, valve port; 9, guide piece; 10, limiting piece; 11, water inlet tube; 12, pressurizing chamber; 13, first casing; 14, second casing; 14a, installation portion; 15, third casing; 15a, installation groove; 16, fourth casing; and 17, guide channel.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present disclosure will be explained in detail below with reference to the drawings.

[0040] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the present disclosure is further described in detail below with reference to the drawings and embodiments. It should be understood that the examples described herein are merely used to explain the present application, rather than to limit the present application.

[0041] In Embodiment I, as shown in FIG. 1 to FIG. 3, a jet pump includes a pump body 3 provided with a water inlet 1 and a water outlet 2. A jet tube 4 and an impeller 5 are provided in the pump body 3. Fluid passes through the water inlet 1, the jet tube 4, the impeller 5, and the water outlet 2 in sequence. At least one flow-increasing channel 6 is provided at the outer periphery of the jet tube 4. The flow-increasing channel 6 is provided around the outside of the jet tube. The flow-increasing channel 6 is in communication with the water inlet 1 and the impeller 5, so the communication flow from the water outlet 2 to the impeller 5 can be increased. The flow-increasing channel 6 is provided with a valve core 7. The movement of the valve core 7 in the flow-increasing channel 6 causes the flow-increasing channel 6 to be opened or closed. When the pressure at the water inlet 1 is greater than a predetermined pressure at the impeller 5, the movement of the valve core 7 causes the flow-increasing channel 6 to be opened, thereby further increasing the flow which is passed and thus effectively increasing the upper limit value of the pump flow. In the case of the low lift, that is, when the pressure at the water inlet 1 is not greater than the predetermined pressure at the impeller 5, the flow-increasing channel 6 is in the closed state. As a result, the water flow reaching the impeller 5 decreases, and the upper limit value of the pump lift is effectively increased.

[0042] The present disclosure adopts the structure of the flow-increasing channel 6 provided around the outside of the jet tube. Compared with the prior art, the overall volume of the entire jet pump does not increase significantly. In the present disclosure, only the valve core 7 is provided in the flow-increasing channel 6, and other structures, such as a partition plate, a guide sleeve, a movable rod, a movable baffle, and a compression spring, are not involved. Therefore, compared with the prior art, the present disclosure has a simple production process and a low production cost.

[0043] In Embodiment II, as shown in FIG. 3 to FIG. 6, a flow-increasing channel 6 is provided at the outer periphery of the jet tube 4. A cross-section of the flow-increasing channel 6 is a closed or open annular structure. The flow-increasing channel 6 is provided around the outer periphery of the jet tube 4.

[0044] Preferably, the cross-section of the flow-increasing channel 6 is an annular structure. The flow-increasing channel 6 is sleeved outside the jet tube 4. The valve core 7 is an annular structure which adapts to the cross-section of the flow-increasing channel 6.

[0045] Preferably, the valve core 7 is made of an elastic material. The valve core 7 can effectively block the valve port 8, thereby closing the flow-increasing channel 6. In the present embodiment, the structure of the valve core is similar to a sealing ring, which is a component with a simple and developed structure. Therefore, the production cost of the product is relatively low.

[0046] In addition, since the valve core 7 is an annular structure, it is equivalent to that the valve core 7 is sleeved outside the wall surface of the flow-increasing channel 6. During the movement of the valve core 7, the valve core 7 is limited by the wall surface of the flow-increasing channel 6, so the movement is stable and reliable.

[0047] In the present embodiment, both the flow-increasing channel 6 and the valve core 7 are highly symmetrical structures. Therefore, during fluid passes through the flow-increasing channel 6 or fluid acts on the valve core 7, the forces acting on the valve core 7 are balanced, which also makes the working state of the valve core 7 stable and reliable.

[0048] Specifically, a valve port 8 is provided at a side of the flow-increasing channel 6, wherein the side of the flow-increasing channel 6 is adjacent to the water inlet 1. The valve port 8 is an annular structure or includes a plurality of regularly arranged rectangular, circular, or arc structures. When the structure of the valve port 8 is provided, the above structures can all meet the water inlet requirements of the flow-increasing channel 6. The plurality of regularly arranged rectangular, circular, or arc structures can also realize the force balance of the valve core 7, thereby realizing the stable and reliable operation of the valve core 7.

[0049] The other contents of Embodiment II are the same as those of Embodiment I.

[0050] In Embodiment III, as shown in FIG. 3 to FIG. 6, a guide piece 9 is provided at a wall surface of the flow-increasing channel 6, wherein the wall surface of the flow-increasing channel 6 is adjacent to the valve port 8. The valve core 7 located in the flow-increasing channel 6 moves to the valve port 8 through the guide piece 9. In the present disclosure, the guide piece 9 is provided to ensure that the valve core 7 can move to the position of the valve port 8 stably and reliably so as to block the valve port 8.

[0051] A limiting piece 10 is provided in the flow-increasing channel 6, and the valve core 7 is located between the valve port 8 and the limiting piece 10. The limiting piece 10 limits the movement stroke of the valve core 7 to prevent the movement path of the valve core 7 from exceeding the limit when the force acting on the valve core 7 is large. When the flow-increasing channel 6 should be blocked, it is difficult for the valve core 7 to move to the position of the valve port 8.

[0052] The other contents of Embodiment III are the same as those of Embodiment II.

[0053] In Embodiment IV, at least two flow-increasing channels 6 are provided at the outer periphery of the jet tube 4, and the cross-section of the flow-increasing channel 6 is circular or rectangular.

[0054] The cross-section of the flow-increasing channel 6 is a curved line segment, and the at least two flow-increasing channels 6 are arranged to form an annular structure.

[0055] A valve port 8 is provided at a side of the flow-increasing channel 6, wherein the side of the flow-increasing channel 6 is adjacent to the water inlet 1. The valve core 7 provided in the flow-increasing channel 6 is adapted to the structure of the valve port 8. When the valve core 7 blocks the valve port 8, the flow-increasing channel 6 is switched off.

[0056] Preferably, the valve port 8 is adapted to the cross-section of the flow-increasing channel 6. The valve port 8 is shaped as a circle, a rectangle, or a curved line segment. Correspondingly, the valve core 7 is a block-shaped structural member whose cross-section is shaped as a circle, a rectangle, or a curved line segment.

[0057] Preferably, the valve core 7 is made of an elastic material. The valve core 7 can effectively block the valve port 8 so as to close the flow-increasing channel 6.

[0058] In the above embodiments, the flow-increasing channel 6 is typically a straight channel. The molding is simple and the production cost is low. Moreover, through the regular arrangement of two or more flow-increasing channels 6, the flow change can be increased without substantially increasing the volume of the jet pump 3.

[0059] The other contents of Embodiment IV are the same as those of Embodiment I.

[0060] In Embodiment V, as shown in FIG. 5 and FIG. 6, a jet device is provided in the pump body 3. The jet device includes the jet tube 4, a water inlet tube 11, and a pressurizing chamber 12. The impeller 5 is provided in the pressurizing chamber 12.

[0061] The water inlet tube 11 is connected to the water inlet. The water inlet tube 11 is in communication with the jet tube 4 as well as the valve port 8 of the flow-increasing channel 6. The jet tube 4 is in communication with the water inlet tube 11 and a water inlet of the impeller 5. The flow-increasing channel 6 is in communication with the water inlet tube 11 and the water inlet of the impeller 5. Fluid passing through the jet tube 4 is thrown out by the impeller 5 and then reaches a pressurized water chamber of the pressurizing chamber 12. The pressurized water chamber of the pressurizing chamber 12 is in communication with the water outlet 2 of the pump body 3. Thus, the present disclosure realizes that the fluid enters the water inlet, passes through the water inlet tube 11, the jet tube 4, the impeller 5, and the pressurized water chamber of the pressurizing chamber 12 in sequence, and then is discharged from the water outlet 2 of the pump body 3.

[0062] Whether the flow-increasing channel 6 is in communication or not depends on a working state of a jet pump. If the flow-increasing channel 6 is in communication, the fluid entering the water inlet tube 11 will pass through the flow-increasing channel 6 and then arrive at the water inlet of the impeller 5. Fluid passing through the flow-increasing channel 6 is thrown out by the impeller 5 and then reaches the pressurized water chamber of the pressurizing chamber 12.

[0063] The jet device includes a first casing 13, a second casing 14, a third casing 15, and a fourth casing 16.

[0064] The first casing 13 and the second casing 14 are connected to form the water inlet tube 11. A part of the jet tube 4 and the valve port 8 of the flow-increasing channel 6 are located in the second casing 14.

[0065] A part of the jet tube 4 and a part of the flow-increasing channel 6 are located in the third casing 15. The second casing 14 and the third casing 15 form the jet tube 4, and the second casing 14 and the third casing 15 form the flow-increasing channel 6.

[0066] The third casing 15 and the fourth casing 16 form the pressurizing chamber 12.

[0067] In the present embodiment, the jet tube 4 including the four parts can not only meet the general molding requirements but also facilitate the assembly of structures such as the valve core 7 and the impeller 5. The assembly is the preferred structural arrangement of the present disclosure.

[0068] Specifically, the third casing 15 is provided with an installation groove 15a. The second casing 14 is correspondingly provided with an installation portion 14a. The installation portion 14a is inserted into the installation groove 15a. A sealing structure is provided between the second casing 14 and the third casing 15. Specifically, the sealing structure may be a sealing member. The second casing 14 and the third casing 15 can be locked by bolts.

[0069] The other contents of Embodiment V are the same as those of Embodiment III or Embodiment IV

[0070] In Embodiment VI, as shown in FIG. 7, a section of the flow-increasing channel 6 is denoted as a guide channel 17, wherein the section of the flow-increasing channel 6 is adjacent to the impeller 5. The guide channel 17 is a curved channel. A guide port of the guide channel 17 is formed at a wall surface of the jet tube 4, wherein the wall surface of the jet tube 4 is adjacent to the impeller 5. With the above-mentioned structural arrangement of the guide channel 17, the fluid discharged from the flow-increasing channel 6 has improved jet efficiency.

[0071] Specifically, the guide port of the guide channel 17 is located at a diffusion section of the jet tube 4. Fluid passing through the flow-increasing channel 6 will enter the jet tube 4 and is guided to the inlet of the pressurizing chamber 12 together with the fluid passing through the jet tube 4. Since the guide port is provided at the diffusion section of the jet tube 4, the fluid discharged from the first channel 6 and the second channel has little influence on the fluid in the jet tube 4 and also avoids the influence of increasing turbulence on the fluid in the flow-increasing channel 6 during the high-speed jet of the jet device.

[0072] Preferably, a longitudinal section of the outer side wall surface of the guide channel 17 is a multi-step stepped surface. Fluid passes through the guide channel 17 and forms a certain buffer on the outer wall surface of the guide channel 17. In this way, the influence on the fluid in the jet tube 4 because of the impact produced by the fluid at the guide port is avoided.

[0073] The other contents of Embodiment VII are the same as those of any one of the above embodiments.

[0074] The present disclosure is described in detail above. Specific examples are used herein to illustrate the principles and implementation of the present disclosure, and the description of the above embodiments is only intended to help understand the present disclosure and the core idea thereof. It should be noted that several improvements and modifications may also be made by those having ordinary skill in the art without departing from the principles of the present disclosure, which should also fall within the scope of protection of the present disclosure.

Claims

1. A jet pump, comprising a pump body (3) provided with a water inlet (1) and a water outlet (2); wherein a jet tube (4) and an impeller (5) are provided in the pump body (3); fluid passes through the water inlet (1), the jet tube (4), the impeller (5), and the water outlet (2) in sequence; at least one flow-increasing channel (6) is provided at the outer periphery of the jet tube (4); the flow-increasing channel (6) is provided around the outside of the jet tube (4); the flow-increasing channel (6) is in communication with the water inlet (1) and an inlet of the impeller (5); fluid passing through the flow-increasing channel (6) is thrown to the pressurizing chamber (12) by the impeller (5); the flow-increasing channel (6) is provided with a valve core (7); and the movement of the valve core (7) in the flow-increasing channel (6) causes the flow-increasing channel (6) to be opened or closed.

2. The jet pump according to claim 1, wherein one flow-increasing channel (6) is provided at the outer periphery of the jet tube (4); a cross-section of the flow-increasing channel (6) is a closed or open annular structure; and the flow-increasing channel (6) is provided around the outer periphery of the jet tube (4).

3. The jet pump according to claim 2, wherein the cross-section of the flow-increasing channel (6) is an annular structure; the flow-increasing channel (6) is sleeved outside the jet tube (4); and the valve core (7) is an annular structure, and the annular structure adapts to the cross-section of the flow-increasing channel (6).

4. The jet pump according to claim 2 or claim 3, wherein a valve port (8) is provided at a side of the flow-increasing channel (6), and the side of the flow-increasing channel (6) is adjacent to the water inlet (1); and the valve port (8) is an annular structure or comprises a plurality of regularly arranged rectangular, circular, or arc structures.

5. The jet pump according to claim 1, wherein a guide piece (9) is provided a wall surface of the flow-increasing channel (6), and the wall surface of the flow-increasing channel (6) is adjacent to the valve port (8); and the valve core (7) located in the flow-increasing channel (6) moves to the valve port (8) through the guide piece (9).

6. The jet pump according to claim 1 or claim 5, wherein a valve port (8) is provided at a side of the flow-increasing channel (6), and the side of the flow-increasing channel (6) is adjacent to the water inlet (1); and a limiting piece (10) is provided in the flow-increasing channel (6), and the valve core (7) is located between the valve port (8) and the limiting piece (10).

7. The jet pump according to claim 6, wherein at least two flow-increasing channels (6) are provided at the outer periphery of the jet tube (4); a cross-section of the flow-increasing channel (6) is circular or rectangular; the valve port (8) is adapted to the cross-section of the flow-increasing channel (6); and the valve port (8) is shaped as a circle, a rectangle, or a curved line segment.

8. The jet pump according to claim 1, wherein a jet device is provided in the pump body (3); and the jet device is made up of the jet tube (4), a water inlet tube (11), the pressurizing chamber (12), and the impeller (5).

9. The jet pump according to claim 8, wherein the water inlet tube (11) is connected to the water inlet; the water inlet tube (11) is in communication with the jet tube (4) and the valve port (8) of the flow-increasing channel (6); the jet tube (4) is in communication with the water inlet tube (11) and a water inlet of the impeller (5); the flow-increasing channel (6) is in communication with the water inlet tube (11) and the water inlet of the impeller (5); fluid passing through the jet tube (4) and the flow-increasing channel (6) is thrown to a pressurized water chamber of the pressurizing chamber (12) by the impeller (5); and the pressurized water chamber of the pressurizing chamber (12) is in communication with the water outlet (2) of the pump body (3).

10. The jet pump according to claim 8, wherein the jet device comprises a first casing (13), a second casing (14), a third casing (15), and a fourth casing (16); the first casing (13) and the second casing (14) are connected to form the water inlet tube (11); a part of the jet tube (4) and the valve port (8) of the flow-increasing channel (6) are located in the second casing (14); a part of the jet tube (4) and a part of the flow-increasing channel (6) are located in the third casing (15); the second casing (14) and the third casing (15) form the jet tube (4); the second casing (14) and the third casing (15) form the flow-increasing channel (6); and the third casing (15) and the fourth casing (16) form the pressurizing chamber (12).

Drawing