(19)
(11)EP 0 142 606 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
27.09.1989 Bulletin 1989/39

(21)Application number: 84107642.5

(22)Date of filing:  02.07.1984
(51)International Patent Classification (IPC)4F04C 29/00

(54)

Strainer device for rotary compressor

Filtereinrichtung für Umlaufverdichter

Installation de filtrage pour compresseur rotatif


(84)Designated Contracting States:
DE FR GB IT NL SE

(30)Priority: 20.10.1983 JP 196525/83

(43)Date of publication of application:
29.05.1985 Bulletin 1985/22

(73)Proprietor: MITSUBISHI DENKI KABUSHIKI KAISHA
Tokyo 100 (JP)

(72)Inventors:
  • Hirahara, Takuho
    Shizuoka-shi Shizuoka-ken (JP)
  • Sano, Fumiaki
    Shizuoka-shi Shizuoka-ken (JP)
  • Ishijima, Koji
    Fujieda-shi Shizuoka-ken (JP)
  • Kawaguchi, Susumu
    Shizuoka-shi Shizuoka-ken (JP)
  • Nakane, Kazuhiro
    Shizuoka-shi Shizuoka-ken (JP)

(74)Representative: Liesegang, Roland, Dr.-Ing. 
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)


(56)References cited: : 
DE-A- 2 457 319
US-A- 3 487 624
US-A- 4 023 708
US-A- 4 137 018
GB-A- 7 126
US-A- 3 487 944
US-A- 4 056 168
  
  • PATENT ABSTRACTS OF JAPAN, unexamined applications, section M, vol. 7, no. 31, February 8, 1983 THE PATENT OFFICE JAPANESE GOVERNMENT page 82 M 192
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description


[0001] This invention relates to a rotary compressor comprising the features of the first part of claims 1 (DE-A-2 457 319). In this known device the communication path containing the strainer is arranged in a radial plane of the rotary compressor and the strainer is located in a deep position in the communication path.

[0002] Figure 1 of the accompanying drawing illustrates a cross-section of the main part of a compression mechanism in a conventional rotary compressor (JP-A-57/186 087). In the drawing a reference numeral 1 designates a cylinder plate, and numerals 2 and 3 refer to side plates which define a suction and compression chamber 4. A rotational shaft 5 is driven by an electric motor, etc. (not shown in the drawing) to decrease and increase a volume in the above-mentioned suction and compression chamber 4 by means of a rolling piston 5a, thereby performing compression of the intake gas. Foreign substances, if any, in the intake gas are removed by a strainer 7 which is disposed at an enlarged portion 6a of a suction pipe 6 which is provided through a shell housing 10 as a pressure container, and the thus filtered intake gas is introduced into the suction and compression chamber 4 by way of a suction port 8 formed in the side plate 2 and a communication path 9 formed in the cylinder plate 1.

[0003] The above-described strainer device, however, has such disadvantages that it requires complicated working steps of enlarging a diameter of the suction pipe at its one portion, then disposing the strainer 7 in the enlarged portion of the suction pipe, and thereafter squeezing the open end of the enlarged portion 6a, and that stringent working precision is required in forming the pipe to meet the necessity for close and tight attachment of the strainer 7 at and to this enlarged portion 6a of the suction pipe 6.

[0004] The problem underlying the present invention is to provide a strainer device in a well determined space within the cylinder plate or the side plate such that easy production and assembling is possible without the risk of damaging the strainer.

[0005] This problem is solved by the features of claim 1.

[0006] The foregoing objects, other objects as well as specific construction and function of the strainer device for the rotary type compressor according to the present invention will become more apparent and understandable from the following detailed description of several preferred embodiments thereof, when read in conjunction with the accompanying drawing.

[0007] In the drawing:

Figure 1 is a cross-sectional view showing a strainer device of a conventional rotary type compressor;

Figure 2 is a cross-sectional view showing a strainer device for the rotary type compressor according to the first embodiment of the present invention;

Figure 3 is an enlarged perspective view of the cylinder plate of the rotary compressor shown in Figure 2;

Figure 4 through 8 are respectively cross-sectional views showing the second to sixth embodiments of the strainer device according to the present invention.



[0008] In the following, the present invention will be described in detail with reference to the preferred embodiments thereof illustrated in the accompanying drawing.

[0009] Referring first to Figures 2 and 3 showing respectively the cross-sectional view of the main part of the strainer device according to the first embodiment of the present invention and a perspective view of the cylinder plate, those parts designated by the reference numerals 1 through 10 inclusive denote the identical or equivalent parts as those in Figure 1. In the drawing, a numeral 11 refers to the cylinder plate. As is clearly seen from the drawing, an enlarged (or diameter-increased) portion 19a is formed at one open end of the communication path 19 to the side of the side plate 12. Within the enlarged portion 19a, there is embedded a caulking member 17a as a fitting to constitute the peripheral rim of the cup-shaped strainer 17. The suction pipe 16 is a straight tube extending in the axial direction of the rotational shaft 5, with one end thereof being connected with the suction port in the side plate 12. The pipe does not have the enlarge portion 6a as in the conventional device shown in Figure 1. Incidentally, a reference numeral 20 in Figure 3 designates a vane groove, into which a vane (not shown in the drawing) is fitted to define the compression chamber and the suction chamber.

[0010] In the strainer device of the above-described construction according to the first embodiment of the present invention, foreign substances which have got mixed in the intake gas such as coolant gas, etc. are removed by the strainer 17, and the thus filtered gas alone is introduced into the suction and compression chamber 4, whereby the same function as has ever been done can be attained. In addition, the working on the suction pipe can be done very easily, since it is the straight tube as already mentioned in the foregoing, and the assembly of the strainer 17 can also be done very easily only by inserting the caulking fitting 17a into the diameter-increased portion 19a of the communication path 19 formed in the cylinder plate 11. In this manner, according to the first embodiment of the present invention, since the caulking fitting 17a for the strainer 17 is embedded in the enlarged portion 19a of the communication path 19 in the cylinder plate 11, the working of the suction pipe 16 and the fitting of the strainer 17 can be simplified very remarkably.

[0011] In the following the second embodiment of the strainer device according to the present invention will be explained in reference to Figure 4. In this second embodiment shown in Figure 4, the construction of the strainer device is exactly same as that of the first embodiment shown in Figure 2 with the exception that the fitting direction of the strainer 17 is reversed.

[0012] Figure 5 shows the third embodiment of the present invention, wherein a flat-shaped strainer 27 is fitted. In either of the second and third embodiments, the diameter d of the communication path 19 formed in the cylinder plate 11 can be made small, whereby rigidity of the cylinder plate 11 can be improved advantageously.

[0013] In the following, the fourth embodiment of the present invention will be explained in reference to Figure 6. In Figure 6, those reference numerals same as in Figures 2 to 5 designates the identical or equivalent parts. In this particular embodiment, the position for setting the strainer is selected in the side plate. In the drawing, a reference numeral 28 designates an enlarged portion of the suction port 18 formed in the side plate 22. In this enlarged portion 28, the caulking fitting 17a constituting the peripheral rim of the strainer 17 is embedded. Same as in the previous embodiments, the suction pipe 16 is a straight tube extending in the axial direction of the rotational shaft 5, one end of which is connected with the suction port 18 formed in the side plate 22. Accordingly, there is no enlarged portion 6a as in the conventional device shown in Figure 1.

[0014] In the strainer device of the above-described construction according to the fourth embodiment of the present invention, foreign substances which have got mixed in the intake gas such as coolant gas, etc. can be removed by the strainer 17, as is the case with the first embodiment, and the thus filtered gas alone is introduced into the suction and compression chamber 4, whereby the same function which has ever been done can be attained. In addition, working of the suction pipe 16 is extremely easy due to its being a straight tube, and the assembly of the strainer 17 can also be completed simply by insertion of the caulking fitting 17a into the enlarged portion 28 of the suction port 18 in the side plate 22, hence this embodiment has the same effect as the first embodiment of the present invention.

[0015] In the following, the fifth and sixth embodiments of the strainer device according to the present invention will be explained in reference to Figures 7 and 8.

[0016] Figure 7 is a cross-sectional view of the main part of the strainer device according to the fifth embodiment of the present invention, wherein the fitting direction of the strainer 17 is reversed in contrast to the embodiment shown in Figure 6.

[0017] Figure 8 illustrates the sixth embodiment of the present invention, wherein the flat-shaped strainer 27, same as that in Figure 5, is fitted. In either of the fifth and sixth embodiments, the diameter d of the communication path 19 formed in the cylinder plate 11 can be made small, whereby rigidity of the cylinder plate 11 can be improved advantageously in the same manner as mentioned in the foregoing.

[0018] As has been explained in the foregoing, the present invention provides the strainer in the cylinder plate or the side plate, instead of providing it within the suction pipe. As the consequence of this, there are various advantages such that no complicated workings are required for disposing the strainer within the suction pipe, and that the disposition of the strainer can be done simultaneously with the assembly of the side plate and the suction pipe, whereby assembly of the strainer device as a whole can be simplified, and the manufacturing cost of the strainer device can be reduced.


Claims

1. Rotary type compressor, comprising'a rolling piston (5a) which rotates with rotation of a rotational shaft (5); a cylinder plate (11) provided in correspondence to the direction of the outer periphery of said rolling piston; a pair of side plates (12; 22) supporting said rotational shaft, and being disposed on both side surfaces of said cylinder plate (11) to define a compression chamber; a suction pipe (16) passing through a shell housing (10) with one end thereof being connected with a suction port (18) formed in one of said side plates to introduce intake gas; a communication path (19) for leading said intake gas from said suction port (18) to said compression chamber; and a strainer (17; 27; 37) for removing foreign substances contained in the intake gas, characterized in that said communication path includes a recess (19a; 28; 31) of enlarged diameter in a front surface of either said cylinder plate (11) or one of said side plates (22), said recess having one end defined by a joint between said cylinder plate and said side plate, and that said strainer (17; 27; 37) is provided in said enlarged diameter portion and has a caulking fitting, which fits into said recess (19a; 28; 31) so as to fix said strainer in position.
 
2. Rotary type compressor according to claim 1, characterized in that said suction pipe (16) is constructed in a substantially rectilinear form over its entire length.
 
3. Rotary type compressor according to claim 1 or 2, characterized in that said suction pipe (16) is disposed substantially in parallel with the axial direction of said rotational shaft (5), on which said piston (5a) is provided.
 
4. Rotary type compressor according to one of claims 1 to 3, characterized in that said enlarged portion (19a) is formed in the cylinder plate (11).
 
5. Rotary type compressor according to one of claims 1 to 3, characterized in that said enlarged portion (28) is formed in said side plate (22).
 
6. The strainer device for the rotary type compressor according to claim 4 or 5, characterized in that said strainer is cup-shaped (17) or flat (27).
 


Ansprüche

1. Umlaufverdichter mit einem Drehkolben (5a), welcher mit einer Welle (5) umläuft;

einer Zylinderplatte (11), welche korrespondierend zur Ausrichtung des äußeren Umfangs des Drehkolbens angeordnet ist, einem Paar Seitenplatten (12; 22), welche die Welle abstützen und zur Bildung einer Verdichterkammer auf den beiden Seiten der Zylinderplatte (11) angeordnet sind;

einem Saugrohr (16), welches durch eine Gehäuseschale (10) ragt, wobei das eine Ende des Saugrohes mit einer Saugöffnung (18) in einer der beiden Seitenplatten zum Einführen von Frischgas verbunden ist, einen Verbindungskanal (19) zum Leiten des Frischgases aus der Saugöffnung (18) zur Verdichterkammer und einem Filter (17; 27; 37) zum Entfernen von Fremdstoffen aus dem Frischgas, dadurch gekennzeichnet, daß der Verbindungskanal eine Aussparung (19a; 28; 31) vergrößerten Durchmessers in einer Frontseite entweder der Zylinderplatte (11) oder einer der Seitenplatten (22) aufweist, wobei das eine Ende der Aussparung durch eine Fuge zwischen der Zylinderplatte und der Seitenplatte definiert ist und das Filter (17; 27; 37) in dem Abschnitt vergrößerten Durchmessers mit dichtem Passitz in der Aussparung (19a; 28; 31) untergebracht ist, um das Filter in Position zu fixieren.


 
2. Umlaufverdichter nach Anspruch 1, dadurch gekennzeichnet, daß das Saugrohr (16) über seine Länge im wesentlichen geradlinig ist.
 
3. Umlaufverdichter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Saugrohr (16) im wesentlichen parallel zur axialen Ausrichtung der Welle (5) ist, auf welcher der Drehkolben (5a) angeordnet ist.
 
4. Drehkolben nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der vergrößerte Durchmesser (19a) in der Zylinderplatte (11) ausgebildet ist.
 
5. Umlaufverdichter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der vergrößerte Durchmesser (28) in der Seitenplatte (22) vorgesehen ist.
 
6. Umlaufverdichter nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß das Filter becherförmig (17) oder eben (27) ausgebildet ist.
 


Revendications

1. Compresseur de type rotatif, comprenant un piston roulant (5a) qui tourne avec la rotation d'un arbre rotatif (5); une plaque de cylindre (11) - prévue en correspondance avec la direction de la périphérie externe dudit piston roulant; une paire de plaques latérales (12; 22) supportant ledit arbre rotatif, et disposées sur les deux surfaces latérales de ladite plaque de cylindre (11) pour définir une chambre de compression; un tuyau d'aspiration (16) passant à travers une enveloppe (10) ayant une extrémité reliée à un orifice d'aspiration (18) ménagé dans une desdites plaques latérales pour introduire le gaz d'admission; un chemin de communication (19) pour acheminer ledit gaz d'admission depuis ledit orifice d'aspiration (18) jusqu'à ladite chambre de compression; et un filtre (17; 27; 37) pour éliminer des substances étrangères contenues dans le gaz d'admission, caractérisé en ce que ledit chemin de communication comporte un évidement (19a; 28; 31) de diamètre agrandi dans une surface avant soit de ladite plaque de cylindre (11) soit de l'une desdites plaques latérales (22), ledit évidement comportant une extrémité définie par un joint entre ladite plaque de cylindre et ladite plaque latérale, et en ce que ledit filtre (17; 27; 37) est prévu dans ladite partie à diamètre agrandi et comporte un élément d'ajustage et de calfatage qui s'adapte dans ledit évidement (19a; 28; 31) de manière à fixer ledit filtre en place.
 
2. Compresseur de type rotatif selon la revendication 1, caractérisé en ce que ledit tuyau d'aspiration (16) est construit suivant une forme essentiellement rectiligne sur la totalité de sa longueur.
 
3. Compresseur de type rotatif selon l'une des revendications 1 ou 2, caractérisé en ce que ledit tuyau d'aspiration (16) est disposé essentiellement parallèlement à la direction axiale dudit arbre rotatif (5), sur lequel est prévu ledit piston (5a).
 
4. Compresseur de type rotatif selon l'une des revendications 1 à 3, caractérisé en ce que ladite partie agrandie (19a) est formée dans la plaque de cylindre (11).
 
5. Compresseur de type rotatif selon l'une des revendications 1 à 3, caractérisé en ce que ladite partie agrandie (28) est formée dans ladite plaque latérale (22).
 
6. Dispositif de filtrage pour le compresseur de type rotatif selon la revendication 4 ou 5, caractérisé en ce que le filtre est en forme de coupelle (17) ou plat (27).
 




Drawing