TECHNICAL FIELD
[0001] The present disclosure relates to a scroll fluid machine unit having a pair of scrolls
rotatable relative to each other.
BACKGROUND
[0002] A scroll fluid machine is known, which can compress or expand a fluid in a space
formed between a pair of scrolls rotatable relative to each other. This type of scroll
fluid machine increases its temperature due to the influence of friction between components,
or compression or expansion of the fluid during operation. Such temperature increase
may reduce the life of a bearing or a lubricant used in the scroll fluid machine and
thus is not preferred. For this reason, the scroll fluid machine includes a cooling
device such as a cooling fan to suppress temperature increase during operation.
[0003] For example, Patent Document 1 discloses a scroll fluid machine including a cooling
fan integrally connected to a rotational shaft of the scroll fluid machine. This scroll
fluid machine can drive the cooling fan by power transmitted from the rotational shaft
of the scroll fluid machine. Thus, it is unnecessary to separately prepare a power
source for the cooling fan, and it is possible to achieve good cooling performance
with a compact configuration.
Citation List
Patent Literature
SUMMARY
Problems to be Solved
[0005] The configuration in which the cooling fan is integrally connected to the rotational
shaft of the scroll fluid machine as described above has to stop the cooling fan when
the scroll fluid machine is stopped. Accordingly, when the scroll fluid machine is
stopped, temperature increases due to heat generated during operation and hot fluid
remaining inside the machine. Such temperature increase may reduce the life of a bearing
accommodated in a casing or a lubricant such as grease and thus is not preferred.
[0006] At least one embodiment of the present invention was made in view of the above issue,
and an object thereof is to provide a scroll fluid machine unit that can provide stable
performance over a long period by suppressing temperature increase during suspension
of operation.
Solution to the Problems
[0007]
- (1) To solve the above problem, a scroll fluid machine unit according to at least
one embodiment of the present invention comprises: a scroll fluid machine capable
of compressing or expanding a fluid in a space formed between a pair of scrolls rotatable
relative to each other; a cooling fan for cooling the scroll fluid machine, the cooling
fan being capable of operating independently of the scroll fluid machine; at least
one temperature detection part configured to detect a temperature of the scroll fluid
machine; and a control part configured to control the cooling fan based on the temperature
detected by the at least one temperature detection part. The control part is configured
to operate the cooling fan until the temperature detected by the at least one temperature
detection part is less than a predetermined first threshold when the scroll fluid
machine is stopped.
With the above configuration (1), since the cooling fan is capable of operating independently
of the scroll fluid machine, it is possible to cool the scroll fluid machine by operating
the cooling fan even when the scroll fluid machine is stopped. Such a cooling fan
operates until the temperature of the scroll fluid machine detected by the temperature
detection part is less than the first threshold when the scroll fluid machine is stopped.
Thus, it is possible to effectively suppress temperature increase caused in the stopped
scroll fluid machine.
- (2) In some embodiments, in the above configuration (1), the control part is configured
to perform control so that the scroll fluid machine operates in a no-load condition
before the scroll fluid machine is stopped.
With the above configuration (2), since the scroll fluid machine operates in a no-load
condition before the scroll fluid machine is stopped, it is possible to discharge
the hot fluid remaining inside the scroll fluid machine. Thus, when the scroll fluid
machine is stopped, it is possible to suppress temperature increase of the scroll
fluid machine due to the hot fluid remaining inside.
- (3) In some embodiments, in the above configuration (2), the control part is configured
to perform control so that the scroll fluid machine operates in a no-load condition
until the temperature detected by the at least one temperature detection part is less
than a predetermined second threshold.
With the above configuration (3), the no-load operation performed when the scroll
fluid machine is stopped continues until the temperature of the scroll fluid machine
detected by the temperature detection part is less than the second threshold. Thus,
it is possible to reliably discharge the hot fluid remaining in the scroll fluid machine
when the machine is stopped.
- (4) In some embodiments, in the above configuration (3), the second threshold is set
higher than the first threshold.
With the above configuration (4), the second threshold is set higher than the first
threshold. Thus, when the scroll fluid machine is stopped, air cooling by the cooling
fan continues even after the hot remaining fluid is discharged by the no-load operation
of the scroll fluid machine, so that it is possible to reliably cool the scroll fluid
machine. In other words, since the no-load operation is shorter than the operating
time of the cooling fan, it is possible to reduce power consumption necessary for
the no-load operation.
- (5) In some embodiments, in any one of the above configurations (1) to (4), the at
least one temperature detection part includes a plurality of temperature sensors disposed
at different positions along a radial direction with respect to a rotational shaft
of the scroll fluid machine.
In the scroll fluid machine, the radially inner side is hotter. Accordingly, in the
stopped scroll fluid machine, heat transfer proceeds from the radially inner side
with high temperature to the radially outer side with low temperature. With the above
configuration (5), since the plurality of temperature sensors are disposed at different
positions in the radial direction, it is possible to more reliably suppress temperature
increase in consideration of heat transfer in the sopped scroll fluid machine.
- (6) In some embodiments, in any one of the above configurations (1) to (5), the at
least one temperature detection part is disposed on at least one of a fixed scroll
and an orbiting scroll constituting the pair of scrolls, a housing accommodating the
pair of scrolls, a crank shaft eccentrically connecting a rotational shaft of the
scroll fluid machine with the orbiting scroll, and a bearing housing connected to
the orbiting scroll.
With the above configuration (6), since the temperature detection part is disposed
in such positions, it is possible to accurately grasp the temperature of the stopped
scroll fluid machine and suppress temperature increase.
- (7) In some embodiments, in any one of the above configurations (1) to (6), each of
the pair of scrolls has a fin on an opposite side to the space, and the cooling fan
is attached to the pair of scrolls from a side so as to able to send air to the fins.
With the above configuration (7), the cooling fan attached to the pair of scrolls
from the side can sent air to the fins of the pair of scrolls, thus enabling efficient
cooling with a compact configuration.
- (8) To solve the above problem, a scroll fluid machine unit according to at least
one embodiment of the present invention comprises: a scroll fluid machine capable
of compressing or expanding a fluid in a space formed between a pair of scrolls rotatable
relative to each other; and a control part configured to control the scroll fluid
machine. The control part is configured to perform control so that the scroll fluid
machine operates in a no-load condition for a predetermined period when the scroll
fluid machine is stopped.
With the above configuration (8), since the scroll fluid machine operates in a no-load
condition, it is possible to discharge the hot fluid remaining inside the scroll fluid
machine. Thus, when the scroll fluid machine is stopped, it is possible to suppress
temperature increase of the scroll fluid machine due to the hot fluid remaining inside.
- (9) In some embodiments, in any one of the above configurations (1) to (8), the scroll
fluid machine is a compressor for supplying a compressed working fluid to a braking
device of a mobile object.
[0008] In such an application, the operation and stop of the scroll fluid machine are repeated
according to the braking operation of the mobile object. In this situation, heat is
likely to be accumulated in the scroll fluid machine. However, by adopting the above
configuration, it is possible to suppress temperature increase in the scroll fluid
machine during stop, and it is possible to improve the life.
Advantageous Effects
[0009] At least one embodiment of the present invention provides a scroll fluid machine
unit that can provide stable performance over a long period by suppressing temperature
increase after suspension of operation.
BRIEF DESCRIPTION OF DRAWINGS
[0010]
FIG. 1 is a perspective view of a scroll fluid machine unit according to an embodiment
of the present invention.
FIG. 2 is a vertical cross-sectional view along a rotational shaft of the scroll fluid
machine unit of FIG. 1.
FIG. 3 is a flowchart showing steps of control of the scroll fluid machine unit performed
by a control part of FIG. 2.
FIG. 4 is a graph showing transition of temperature T of the scroll fluid machine
in respond to an ON/OFF instruction from an ECU.
FIG. 5 is a graph showing transition of temperature T of the scroll fluid machine
in respond to an ON/OFF instruction from an ECU.
DETAILED DESCRIPTION
[0011] Embodiments of the present invention will now be described in detail with reference
to the accompanying drawings. It is intended, however, that unless particularly identified,
dimensions, materials, shapes, relative positions and the like of components described
in the embodiments shall be interpreted as illustrative only and not intended to limit
the scope of the present invention.
[0012] For instance, an expression of relative or absolute arrangement such as "in a direction",
"along a direction", "parallel", "orthogonal", "centered", "concentric" and "coaxial"
shall not be construed as indicating only the arrangement in a strict literal sense,
but also includes a state where the arrangement is relatively displaced by a tolerance,
or by an angle or a distance whereby it is possible to achieve the same function.
[0013] Further, for instance, an expression of a shape such as a rectangular shape or a
cylindrical shape shall not be construed as only the geometrically strict shape, but
also includes a shape with unevenness or chamfered corners within the range in which
the same effect can be achieved.
[0014] On the other hand, an expression such as "comprise", "include", "have", "contain"
and "constitute" are not intended to be exclusive of other components.
[0015] FIG. 1 is a perspective view of a scroll fluid machine unit 1 according to an embodiment
of the present invention. FIG. 2 is a vertical cross-sectional view along a rotational
shaft 18 of the scroll fluid machine unit 1 of FIG. 1.
[0016] In FIG. 2, a control system of the scroll fluid machine unit 1 omitted in FIG. 1
is also shown by a functional block.
[0017] The scroll fluid machine unit 1 is a unit in which a scroll fluid machine (main body)
2, an electric motor 4 serving as a power source of the scroll fluid machine 2, and
a cooling fan 6 for cooling the scroll fluid machine 2 are integrally combined. The
scroll fluid machine unit 1 according to the present embodiment comprises a compressor
for compressing a fluid as the scroll fluid machine 2 and, in particular, forms a
part of a brake system for supplying a compressed working fluid to a braking device
mounted on a mobile object such as a vehicle.
[0018] Although the following embodiments will be described with respect to the scroll fluid
machine unit 1 that is used to supply the compressed working fluid to the braking
device of the vehicle, the unit may be used for other applications. Further, the scroll
fluid machine unit 1 may be an expander unit for expanding a fluid.
[0019] The scroll fluid machine 2 has, on a front side (left side in FIG. 2), a supply port
8 to which a fluid (e.g., air such as outside air) to be compressed is supplied, and
an outlet port 10 from which the fluid compressed by the scroll fluid machine 2 is
discharged. The fluid supplied to the supply port 8 is compressed in a space (compression
chamber) formed between a pair of scrolls rotating relative to each other inside the
scroll fluid machine 2 and then is discharged from the outlet port 10.
[0020] The scroll fluid machine 2 has a housing 12 forming the shell. As shown in FIG. 2,
the housing 12 accommodates a pair of scrolls rotatable relative to each other, namely,
a fixed scroll 14 and an orbiting scroll 16. The fixed scroll 14 is fixed to the housing
12, and the orbiting scroll 16 is configured to be rotatable by power transmitted
from the electric motor 4.
[0021] The fixed scroll 14 includes a fixed-side end plate 14a oriented perpendicular to
the front-back direction, and a fixed scroll wrap 14b in a spiral shape disposed on
the back surface of the end plate 14a. The tip of the fixed scroll wrap 14b has a
groove, and the groove receives a tip seal (not shown) made of a self-lubricating
material, such as fluororesin. On the front surface of the fixed-side end plate 14a,
a cooling fin 14c is disposed for heat dissipation.
[0022] An outlet hole 17 communicating with the outlet port 10 is formed in a substantially
central portion of the fixed-side end plate 14a of the fixed scroll 14. The fixed
scroll wrap 14b is formed spirally from the vicinity of the outlet hole 17 toward
the outer periphery.
[0023] The orbiting scroll 16 includes an orbiting-side end plate 16a oriented perpendicular
to the front-back direction, and an orbiting scroll wrap 16b in a spiral shape disposed
on the front surface of the end plate 16a. The tip of the orbiting scroll wrap 16b
has a groove, and the groove receives a tip seal (not shown) made of a self-lubricating
material, such as fluororesin. On the back surface of the orbiting-side end plate
16a, a cooling fin 16c is disposed for heat dissipation.
[0024] To the back surface of the orbiting-side end plate 16a, a bearing housing 25 is fixed.
The bearing housing 25 has a hub 24 into which a bearing 22 of an eccentric shaft
part rotatably supporting a crank shaft 20 of the rotational shaft 18 is fitted.
[0025] The orbiting scroll 16 is substantially prevented from rotating by a rotation prevention
mechanisms 28 disposed between the orbiting-side end plate 16a and the housing 12.
The rotation prevention mechanisms 28 are disposed at three locations on the back
surface of the orbiting-side end plate 16a along the periphery at 120° intervals.
The rotation prevention mechanism 28 includes a crank member 30 having an orbiting-side
crankpin and a fixed-side crankpin eccentric with respect to the orbiting-side crankpin.
The eccentricity amount of the crank member 30 is set equal to the eccentricity amount
of the crank shaft 20 with respect to the rotational shaft 18. Such a crank member
30 is rotatably supported by bearings 32 and 34 which are radial bearings.
[0026] Since the scroll fluid machine 2 includes the rotation prevention mechanism 28 having
the above configuration, when the rotational shaft 18 is driven by power transmitted
from the electric motor 4, the orbiting scroll 16 orbits (revolves) while rotation
is substantially prevented. As a result, a space (compression chamber) 19 formed between
the fixed scroll 14 and the orbiting scroll 16 (i.e., between the fixed scroll wrap
14b and the orbiting scroll wrap 16b) moves from the radially outer side to the radially
inner side as the fixed scroll 14 and the orbiting scroll 16 rotate relative to each
other, and a fluid is compressed.
[0027] In the present embodiment, the scroll fluid machine 2 is provided with first to fifth
temperature sensors 36a to 36e as a temperature detection part for detecting temperature
of the scroll fluid machine 2. The first temperature sensor 36a is attached to the
fixed scroll 14. The second temperature sensor 36b is attached to the orbiting scroll
16. The third temperature sensor 36c is attached to the housing 12. The fourth temperature
sensor 36d is attached to the crank shaft 20. The fifth temperature sensor 36e is
attached to the bearing housing 25.
[0028] Further, the first to fifth temperature sensors 36a to 36e are disposed at different
positions in the radial direction with respect to the rotational shaft 18 of the scroll
fluid machine 2. As described above, since the temperature of the scroll fluid machine
2 increases as the space (compression chamber) 19 moves radially inward, in the stopped
scroll fluid machine 2, heat transfer proceeds from the radially inner side where
the hot fluid remains to the radially outer side. Therefore, when the first to fifth
temperature sensors 36a to 36e are disposed at different positions in the radial direction,
it is possible to favorably evaluate heat transfer in the stopped scroll fluid machine.
[0029] The electric motor 4 is an electric motor that can be driven by power supplied from
the outside and functions as a power source of the scroll fluid machine 2. The electric
motor 4 is disposed behind (right side in FIG. 2) the scroll fluid machine 2. The
electric motor 4 is a magnet motor including a motor casing 40 containing a rotor
42 and a stator 44. The rotor 42 is connected to the rotational shaft 18 of the scroll
fluid machine 2 so that output power of the electric motor 4 is transmitted via the
rotational shaft 18 to drive the scroll fluid machine 2. Thus, since the scroll fluid
machine 2 and the electric motor 4 are directly connected not via a transmission member
such as a coupling or a belt, the scroll fluid machine unit 1 is compact with reduced
power transmission loss.
[0030] As shown in FIG. 1, the cooling fan 6 is attached to a side of the scroll fluid machine
2 and includes a fan casing 46 and a fan body 48 accommodated therein. When the fan
body 48 operates, the air taken from the outside is introduced into the scroll fluid
machine 2 via a passage formed by the fan casing 46. In the present embodiment, particularly,
the housing 12 of the scroll fluid machine 2 has an opening 49 partially opening at
a connection portion with the fan casing 46, and the air from the fan casing 46 is
introduced into the cooling fin 14c of the fixed scroll 14 and the cooling fin 16c
of the orbiting scroll 16 via the opening 49.
[0031] The air passing through the cooling fin 14c of the fixed scroll 14 and the cooling
fin 16c of the orbiting scroll 16 is discharged to the outside from a discharge port
(not shown) formed in the housing 12 of the scroll fluid machine 2.
[0032] Such a cooling fan 6 is configured to be operable independently of the scroll fluid
machine 2. For example, the cooling fan 6 has a drive power supply (not shown) independent
of the electric motor 4, which is the power source of the scroll fluid machine 2.
[0033] Since the cooling fan 6 is to cool the scroll fluid machine 2, the electric motor
4 may include its own cooling device (e.g., a dedicated fan separate from the cooling
fan 6).
[0034] Further, as shown in FIG. 2, the scroll fluid machine unit 1 has a control part 50
which is a controller for controlling the operation of the scroll fluid machine unit
1. The control part 50 includes, for example, an electronic arithmetic device loaded
with a program designed to execute a predetermined operation. In the present embodiment,
the control part 50 acquires detection values from the first to fifth temperature
sensors 36a to 36e which are the temperature detection part, and controls the operation
of the scroll fluid machine unit 1 in accordance with the detection results.
[0035] The control part 50 may be a part of the scroll fluid machine unit 1, or may be a
separate device from the external scroll fluid machine unit 1.
[0036] Further, the control part 50 is configured to be able to communicate with an ECU
60 which is a control unit of the vehicle equipped with the scroll fluid machine unit
1. The ECU 60 transmits a control signal corresponding to ON/OFF of the scroll fluid
machine unit 1 to the control part 50 in accordance with the amount of compressed
fluid required by the braking device mounted on the vehicle. The control part 50 performs
control to switch ON/OFF of the scroll fluid machine unit 1 in response to the control
signal from the ECU 60.
[0037] Next, the details of control of the scroll fluid machine unit 1 having the above
configuration will be described. FIG. 3 is a flowchart showing steps of control of
the scroll fluid machine unit 1 performed by the control part 50 of FIG. 2.
[0038] First, the control part 50 determines whether an OFF instruction of the scroll fluid
machine unit 1 is issued based on a control signal from the ECU 60 (step S1). If it
is determined that the OFF instruction is issued to the scroll fluid machine unit
1 (step S1: YES), the control part 50 operates the cooling fan 6 (step S2). By operating
the cooling fan 6 before the scroll fluid machine 2 is stopped, it is possible to
suppress temperature increase of the scroll fluid machine 2.
[0039] If the cooling fan 6 has been operating from before step S1, the operation of the
cooling fan 6 simply continues in step S2.
[0040] Further, the control part 50 starts to operate the scroll fluid machine 2 in a no-load
condition (step S3). By operating the scroll fluid machine 2 in a no-load condition
before the scroll fluid machine 2 is stopped, it is possible to discharge the hot
fluid remaining inside the scroll fluid machine 2. Thus, when the scroll fluid machine
2 is stopped, it is possible to suppress temperature increase of the scroll fluid
machine 2 due to the hot fluid remaining inside.
[0041] Steps S2 and S3 may be performed before or after each other, or may be performed
simultaneously with each other.
[0042] Then, the control part 50 acquires a detection value from at least one of the first
to fifth temperature sensors 36a to 36e to detect the temperature T of the scroll
fluid machine unit 1 (step S4). In step S4, the detection value of at least one of
the first to fifth temperature sensors 36a to 36e may be used as the temperature T
of the scroll fluid machine unit 1, or representative temperature of the scroll fluid
machine unit 1 may be calculated from respective detection values of the first to
fifth temperature sensors 36a to 36e, and this value may be used as the temperature
T of the scroll fluid machine unit 1.
[0043] Then, the control part 50 acquires a first threshold T1 and a second threshold T2
which are used as reference values of the temperature T of the scroll fluid machine
unit 1 acquired in step S4 (step S5). Such first threshold T1 and second threshold
T2 are previously stored, for example, in a memory built in the control part 50, and
the control part 50 is configured to be able to read the thresholds as appropriate.
As described later, the first threshold T1 is a threshold for determining whether
to continue the operation of the cooling fan 6 executed in step S2, and the second
threshold T2 is a threshold for determining whether to continue the no-load operation
of the scroll fluid machine executed in step S3.
[0044] Then, the control part 50 determines whether the temperature T of the scroll fluid
machine unit 1 acquired in step S4 is less than the second threshold T2 (step S6).
If the temperature T of the scroll fluid machine unit 1 is less than the second threshold
T2 (step S6: YES), the control part 50 determines that the hot fluid remaining inside
the scroll fluid machine 2 is sufficiently discharged, and terminates the no-load
operation of the scroll fluid machine 2, and stops the scroll fluid machine 2 (step
S7). Thus, by terminating the no-load operation of the scroll fluid machine 2 at an
appropriate timing, it is possible to reduce useless power consumption.
[0045] Here, since the second threshold T2 is set higher than the first threshold T1, the
cooling fan 6 continues to operate when the no-load operation of the scroll fluid
machine 2 is terminated in step S7. In other words, the cooling fan 6 operates while
the scroll fluid machine 2 is stopped.
[0046] Then, the control part 50 continuously monitors the temperature T of the scroll fluid
machine unit 1 to determine whether the temperature T is less than the first threshold
T1 (step S8). If it is determined that the temperature T of the scroll fluid machine
unit 1 is less than the first threshold T1 (step S8: YES), the control part 50 stops
the cooling fan 6 (step S9). In other words, the operation of the cooling fan 6 continues
until the temperature T of the scroll fluid machine unit 1 is less than the first
threshold T1. Thus, even after the discharge of the hot remaining fluid is completed
by the no-load operation of the scroll fluid machine 2, air cooling by the cooling
fan continues, so that it is possible to reliably cool the scroll fluid machine 2.
[0047] FIG. 4 and FIG. 5 are graphs showing transition of the temperature T of the scroll
fluid machine 2 in respond to an ON/OFF instruction from the ECU 60.
[0048] In FIG. 4 and FIG. 5, as comparative examples, temperature transition of a scroll
fluid machine in which the above control is not performed (i.e., a scroll fluid machine
unit that has the same structure as the scroll fluid machine unit 1 according to the
present embodiment, but is configured to be controlled such that the scroll fluid
machine unit 1 is wholly stopped immediately in response to an OFF instruction from
the ECU 60) is shown by the dashed line.
[0049] FIG. 4 shows the case of repeating cycles in which an OFF instruction is issued from
the ECU 60, and then, after the temperature T of the scroll fluid machine 2 reaches
the first threshold T1, an ON instruction is issued from the ECU 60 again. In this
case, in the comparative example, the temperature of the scroll fluid machine increases
to Tmax1'; while in the present embodiment, when the scroll fluid machine unit 1 is
stopped, the operation of the cooling fan 6 (see step S2 of FIG. 3) and the no-load
operation of the scroll fluid machine 2 (see step S3 of FIG. 3) are performed, so
that the maximum temperature is reduced to Tmax1.
[0050] FIG. 5 shows the case of repeating cycles in which an OFF instruction is issued from
the ECU 60, and then, before the temperature T of the scroll fluid machine 2 reaches
the first threshold T1, an ON operation is performed again. In this case, in the comparative
example, the temperature of the scroll fluid machine increases to Tmax2'; while in
the present embodiment, when the scroll fluid machine unit 1 is stopped, the operation
of the cooling fan 6 (see step S2 of FIG. 3) and the no-load operation of the scroll
fluid machine 2 (see step S3 of FIG. 3) are performed, so that the maximum temperature
is reduced to Tmax2.
[0051] Although the above embodiment has been described with respect to the case where,
when the scroll fluid machine unit 1 is stopped, both the operation of the cooling
fan 6 (see step S2 of FIG. 3) and the no-load operation of the scroll fluid machine
2 (see step S3 of FIG. 3) are performed, either one may be performed.
[0052] As described above, at least one embodiment of the present invention provides a scroll
fluid machine unit 1 that can provide stable performance over a long period by suppressing
temperature increase after stop.
Industrial Applicability
[0053] At least one embodiment of the present invention can be applied to the scroll fluid
machine unit having a pair of scrolls rotatable relative to each other.
Reference Signs List
[0054]
- 1
- Scroll fluid machine unit
- 2
- Scroll fluid machine
- 4
- Electric motor
- 6
- Cooling fan
- 8
- Supply port
- 10
- Outlet port
- 12
- Housing
- 14
- Fixed scroll
- 14a
- Fixed-side end plate
- 14b
- Fixed scroll wrap
- 14c, 16c
- Cooling fin
- 16
- Orbiting scroll
- 16a
- Orbiting-side end plate
- 16b
- Orbiting scroll wrap
- 17
- Outlet hole
- 18
- Rotational shaft
- 19
- Space (Compression chamber)
- 20
- Crank shaft
- 22, 32, 34
- Bearing
- 24
- Hub
- 25
- Bearing housing
- 28
- Rotation prevention mechanism
- 30
- Crank member
- 36a
- First temperature sensor
- 36b
- Second temperature sensor
- 36c
- Third temperature sensor
- 36d
- Fourth temperature sensor
- 36e
- Fifth temperature sensor
- 42
- Rotor
- 46
- Fan casing
- 48
- Fan body
- 49
- Opening
- 50
- Control part
- 60
- ECU
1. A scroll fluid machine unit comprising:
a scroll fluid machine capable of compressing or expanding a fluid in a space formed
between a pair of scrolls rotatable relative to each other;
a cooling fan for cooling the scroll fluid machine, the cooling fan being capable
of operating independently of the scroll fluid machine;
at least one temperature detection part configured to detect a temperature of the
scroll fluid machine; and
a control part configured to control the cooling fan based on the temperature detected
by the at least one temperature detection part,
wherein the control part is configured to operate the cooling fan until the temperature
detected by the at least one temperature detection part is less than a predetermined
first threshold when the scroll fluid machine is stopped.
2. The scroll fluid machine unit according to claim 1,
wherein the control part is configured to perform control so that the scroll fluid
machine operates in a no-load condition before the scroll fluid machine is stopped.
3. The scroll fluid machine unit according to claim 2,
wherein the control part is configured to perform control so that the scroll fluid
machine operates in a no-load condition until the temperature detected by the at least
one temperature detection part is less than a predetermined second threshold.
4. The scroll fluid machine unit according to claim 3,
wherein the second threshold is set higher than the first threshold.
5. The scroll fluid machine unit according to any one of claims 1 to 4,
wherein the at least one temperature detection part includes a plurality of temperature
sensors disposed at different positions along a radial direction with respect to a
rotational shaft of the scroll fluid machine.
6. The scroll fluid machine unit according to any one of claims 1 to 5,
wherein the at least one temperature detection part is disposed on at least one of
a fixed scroll and an orbiting scroll constituting the pair of scrolls, a housing
accommodating the pair of scrolls, a crank shaft eccentrically connecting a rotational
shaft of the scroll fluid machine with the orbiting scroll, and a bearing housing
connected to the orbiting scroll.
7. The scroll fluid machine unit according to any one of claims 1 to 6,
wherein each of the pair of scrolls has a fin on an opposite side to the space, and
wherein the cooling fan is attached to the pair of scrolls from a side so as to able
to send air to the fins.
8. A scroll fluid machine unit comprising:
a scroll fluid machine capable of compressing or expanding a fluid in a space formed
between a pair of scrolls rotatable relative to each other; and
a control part configured to control the scroll fluid machine,
wherein the control part is configured to perform control so that the scroll fluid
machine operates in a no-load condition for a predetermined period when the scroll
fluid machine is stopped.
9. The scroll fluid machine unit according to any one of claims 1 to 8,
wherein the scroll fluid machine is a compressor for supplying a compressed working
fluid to a braking device of a mobile object.