JP2005069084A - Reed valve of fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reed valve preventing local decrease of valve rigidity, inhibiting decrease of torsional stiffness and reducing entire valve rigidity. <P>SOLUTION: An end 53a in a longitudinal direction of a reed strip 53 faces an outlet of a discharge port and the other end 53b is fixed by a valve guard section. In an intermediate part 53c between the end and the other end of the reed strip, portions 57 elongated by formation of a hole 56 form a shape extending long in the longitudinal direction. The elongated portion may be uniform or not uniform in cross section. The hole of the reed valve extends from the vicinity of the end towards the other end and may terminate at a position overlapping the valve guard section, terminate immediately before the position overlapping the valve guard section or terminate at a boundary between the position overlapping the valve guard section and the position not overlapping. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reed valve used in a fluid machine such as a compressor.

  For example, compressors used in air conditioners are generally called swash plate type, scroll type, rotary type and the like. These compressors may be provided with a fluid passage in which the compression chamber and the discharge chamber communicate with each other, that is, a reed valve that functions as a discharge valve on the outlet side of the discharge hole. The reed valve prevents the backflow of the refrigerant gas from the discharge chamber toward the compression chamber. Only when the pressure in the compression chamber rises above the pressure in the discharge chamber, the reed valve opens and the refrigerant gas flows out from the compression chamber to the discharge chamber.

  If the reed valve has high rigidity, the pressure difference required to open the valve increases. This leads to an increase in overcompression and an increase in power loss of the compressor. In consideration of this point, for example, in Patent Document 1, the rigidity of the valve is reduced by reducing the intermediate portion of the reed valve to reduce the power loss.

  However, since the rigidity of the reed valve having a narrow intermediate portion is locally reduced, particularly large deformation occurs locally when the valve is opened, and accordingly, the generated stress increases and the valve strength decreases. . Further, since the torsional rigidity of the valve is lowered, there is a possibility that the valve may be damaged when the valve is inclined and seated.

Therefore, an object of the present invention is to provide a reed valve in which the overall valve rigidity is reduced while preventing a local decrease in valve rigidity.
JP 2000-145678 A

  Another object of the present invention is to provide a reed valve having a reduced valve rigidity while suppressing a decrease in torsional rigidity.

  Still another object of the present invention is to provide a fluid machine including the above-described reed valve.

  According to the present invention, there is provided a reed valve in which one end portion in the longitudinal direction is opposed to the outlet of the fluid passage and the other end portion is fixed by the valve pressing portion, and is provided at an intermediate portion between the one end portion and the other end portion. A reed valve for a fluid machine is obtained, in which a portion narrowed by forming a hole extends in the longitudinal direction.

  The thinned portion may have a uniform cross section.

  The thinned portion may have a non-uniform cross section.

  The hole may be a long hole extending in the longitudinal direction from the vicinity of the one end portion toward the other end portion.

  The hole may be terminated at a position on the valve pressing portion.

  The hole may be terminated just before the position of the valve pressing portion.

  The hole may terminate at a boundary between a position on the valve pressing portion and a position not applied.

  Moreover, according to this invention, the fluid machine provided with the reed valve mentioned above is obtained.

  According to the present invention, it is possible to provide a reed valve in which the overall valve rigidity is reduced while preventing a local decrease in valve rigidity and suppressing a decrease in torsional rigidity, and a fluid machine including the reed valve. .

  In this way, in the present invention, since the valve rigidity of the reed valve is lowered, the power loss of the fluid machine can be reduced. Furthermore, since the contact area between the reed valve and the retainer is reduced, sticking of the reed valve due to oil can be prevented, whereby the valve opening delay and return delay can be reduced, and the power loss of the fluid machine can be reduced. Further, since the reduction in torsional rigidity is prevented as much as possible while lowering the valve rigidity, it is possible to prevent the valve from being damaged by torsion. In addition, the speed at which the reed valve is seated can be reduced, thereby reducing the noise at the time of sitting and reducing the noise of the fluid machine.

  With reference to FIG. 1, an electric compressor which is a fluid machine including a reed valve according to an embodiment of the present invention will be described.

  The electric compressor shown in FIG. 1 is a so-called scroll type used in an air conditioner, and includes a discharge housing 11, an intermediate housing 12, and a suction housing 13. The discharge housing 11, the intermediate housing 12, and the suction housing 13 are all made of a metal material and are connected to each other by bolts 14 a and 14 b to form a sealed container 15.

  The discharge housing 11 includes a discharge port 16 on the end surface. A fixed scroll member 17 fixed to the discharge housing 11 and a movable scroll member 18 facing the fixed scroll member 17 are disposed in the discharge housing 11, and the gas refrigerant is compressed by the fixed and movable scroll members 17 and 18. The gas compression part 19 which forms the compression chamber 20 to perform is comprised.

  The fixed scroll member 17 includes a bottom plate 21, a spiral body 22 provided on one surface of the bottom plate 21, and a fixing portion 23 provided on the other surface of the bottom plate 21. The fixing portion 23 is fixed to the end wall of the discharge housing 11 by screws 24.

  The movable scroll member 18 includes a bottom plate 26, a spiral body 27 provided on one surface of the bottom plate 26, and a boss portion 28 protruding in a cylindrical shape from the other surface side of the bottom plate 27. Between the surface of the bottom plate 26 around the boss portion 28 and one end of the intermediate housing 12, there is provided a rotation prevention mechanism 29 composed of a ball coupling that prevents the movable scroll member 18 from rotating and enables a turning motion. Yes.

  A shaft 31 extending from the intermediate housing 12 to the suction housing 13 is provided. One end 31 a of the shaft 31 is supported inside a bearing fitting portion 33 that protrudes from the end wall 32 of the suction housing 13 toward the compression portion 19 via a rolling bearing 34.

  The electric compressor in FIG. 1 further includes a motor (electric unit) 35. The motor 35 is provided in the stator 36 on the inner wall portion of the intermediate housing 12 and the suction housing 13, a coil 37 provided in the periphery thereof, and provided in the stator 36, and is fixed to the shaft 31 around the shaft 31. The rotor 38 is provided.

  A large-diameter portion 31 b is provided at the other end of the shaft 31 and is supported in the intermediate housing 12 via a rolling bearing 39. An eccentric pin 31c is provided so as to protrude from the end of the large-diameter portion 31b. The eccentric pin 31 c is inserted into an eccentric bush 42 supported by the boss portion 28 via a bearing 41.

  During operation of this electric compressor, the refrigerant gas flows into the suction housing 13 through the suction port 43. The refrigerant gas that has flowed into the suction housing 13 further flows into the discharge housing 11 through the clearances of the gas passages 44 and 45 and the rolling bearings 39, the opening 46, and the like, and passes through the clearances of the rotation prevention mechanism 29. It reaches around 19 and is taken into the compression chamber 20.

  The refrigerant gas compressed in the compression chamber 20 flows out to the discharge chamber 52 through the fluid passage provided in the bottom plate 21 of the fixed scroll member 17, that is, the discharge hole 51. The refrigerant gas is further discharged from the discharge chamber 52 through the discharge port 16 to the outside of the compressor.

  On the outlet side of the discharge hole 51, a reed valve 53 that functions as a discharge valve and a retainer 54 that suppresses excessive bending of the reed valve 53 are provided. The reed valve 53 and the retainer 54 are fastened to the bottom plate 21 of the fixed scroll member 17 by bolts 55. The reed valve 53 prevents the reverse flow of the refrigerant gas from the discharge chamber 52 toward the compression chamber 20. Only when the pressure in the compression chamber 20 rises above the pressure in the discharge chamber 52, the reed valve 53 is opened and the refrigerant gas flows out from the compression chamber 20 through the discharge hole 51 to the discharge chamber 52. A portion where the reed valve 53 is pressed by the retainer 54 and the bolt 55 is referred to as a valve pressing portion in the following description.

  With reference to FIG.2 and FIG.3, the attachment form and operation | movement of the reed valve 53 are demonstrated.

  In the reed valve 53, one end 53a in the longitudinal direction faces the outlet of the discharge hole 51, and the other end 53b is fixed to the fixed scroll member 17 by the above-described valve pressing portion. When the pressure in the compression chamber 20 is lower than the pressure in the discharge chamber 52, the one end 53 a of the reed valve 53 is in close contact with the fixed scroll member 17 to close the outlet of the discharge hole 51 as shown in FIG. The reverse flow of the refrigerant gas toward the compression chamber 20 is prevented. When the pressure in the compression chamber 20 rises higher than the pressure in the discharge chamber 52, the one end 53a of the reed valve 53 moves away from the fixed scroll 17 and opens the outlet of the discharge hole 51 as shown in FIG. The refrigerant gas flows from the compression chamber 20 through the discharge hole 51 to the discharge chamber 52.

  The configuration of the reed valve 53 will be described with reference to FIG.

  The reed valve 53 of FIG. 4 is made of a thin and long metal plate material having a substantially constant width and thickness, and the other end from the vicinity of the one end portion 53a to the intermediate portion 53c between the one end portion 53a and the other end portion 53b. A long rectangular slot 56 extending in the longitudinal direction toward the portion 53b is provided. Due to the formation of the long hole 56, a pair of thinned portions 57 extend in the longitudinal direction in the intermediate portion 53c of the reed valve 53. The thinned portion 57 has a uniform cross section, but may be formed non-uniformly with the cross section varying in the longitudinal direction. A through hole 58 for inserting the bolt 55 described above is formed in the other end 53b of the reed valve 53.

  With reference to FIG. 5, the positional relationship between the reed valve 53 and the above-described valve presser will be described. In FIG. 5, a portion of the reed valve 53 that is pressed by the valve pressing portion is hatched, and a portion that faces the discharge hole 51 is indicated by a broken-line circle.

  The long hole 56 of the reed valve 53 may extend to a position applied to the valve pressing portion as shown in FIG. 5A, or may be terminated as shown in FIG. 5B. It may be terminated immediately before or at a boundary between a position on the valve presser portion and a position not applied as shown in FIG. 5 (b).

  Various modifications can be made to the shape of the reed valve 53. Some examples of these modifications are shown in FIGS. 6 (a), (b), and (c).

  The overall width of the reed valve 53-1 shown in FIG. 6A is substantially constant, whereas the width of the long hole 56 gradually and linearly changes in the longitudinal direction. Therefore, the thinned portion 57 is non-uniform in which the cross section varies in the longitudinal direction, and is formed so as to become wider as it approaches the other end portion 53b to be fixed.

  In the reed valve 53-2 in FIG. 6B, the entire width and the width of the elongated hole 56 gradually and linearly change in the longitudinal direction, and as the other end 53b to be fixed approaches, Is also narrower. Thus, the thinned portion 57 has a uniform cross section in the longitudinal direction.

  The overall width of the reed valve 53-3 in FIG. 6 (c) gradually and linearly changes in the longitudinal direction, and the width of each reed valve 53-3 decreases as it approaches the other end 53b to be fixed. On the other hand, the width of the slot 56 is substantially constant. Therefore, the thinned portion 57 is non-uniform in which the cross section varies in the longitudinal direction, and is formed so as to become narrower as it approaches the other end 53b to be fixed.

  In the above description, the scroll type electric compressor has been described as an example. However, the present invention is not limited to this, and the present invention can be similarly applied to various other types of fluid machines. In the case of a so-called reciprocating fluid machine, the reed valve described above can also be used as a suction valve.

  The electric compressor according to the present invention can be applied to a refrigeration circuit used in an air conditioner.

It is a longitudinal section of an electric compressor which is a fluid machine provided with a reed valve concerning an embodiment of the invention. It is sectional drawing which shows the principal part of the electric compressor of FIG. 1 in the state which the reed valve closed the discharge hole. It is sectional drawing which shows the principal part of the electric compressor of FIG. 1 in the state in which the reed valve opened the discharge hole. It is a top view of the reed valve used for the electric compressor of FIG. It is a figure for demonstrating the positional relationship of the reed valve and the valve pressing part which presses it in the electric compressor of FIG. It is the top view which showed various modifications of the shape of a reed valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Discharge housing 12 Intermediate housing 13 Suction housing 14a, 14b Bolt 15 Airtight container 16 Discharge port 17 Fixed scroll member 18 Movable scroll member 19 Gas compression part 20 Compression chamber 21 Bottom plate of fixed scroll member 22 Scroll body of fixed scroll member 23 Fixed part 24 screw 26 bottom plate of movable scroll member 27 spiral body of movable scroll member 28 boss portion 29 rotation prevention mechanism 31 shaft 31a one end of shaft 31b large diameter portion 31c eccentric pin 32 end wall of suction housing 33 bearing fitting portion 34 rolling bearing 35 Motor (electric part)
36 Stator 37 Coil 38 Rotor 39 Rolling bearing 41 Bearing 42 Eccentric bush 43 Suction port 44, 45 Gas passage 46 Open hole 51 Discharge hole 52 Discharge chamber 53, 53-1, 53-2, 53-3 Reed valve 53a One end portion 53b The other end portion of the reed valve 53c The intermediate portion of the reed valve 54 Retainer 55 Bolt 56 Long hole 57 Thinned portion 58 Through hole

Claims (8)

  A reed valve having one end in the longitudinal direction facing the outlet of the fluid passage and the other end fixed by a valve presser, and is narrowed by forming a hole in an intermediate portion between the one end and the other end A reed valve for a fluid machine, characterized in that the formed portion extends in the longitudinal direction.   The reed valve according to claim 1, wherein the thinned portion has a uniform cross section.   The reed valve of claim 1, wherein the narrowed portion has a non-uniform cross section.   4. The reed valve according to claim 1, wherein the hole is a long hole extending in the longitudinal direction from the vicinity of the one end portion toward the other end portion. 5.   The reed valve according to claim 4, wherein the hole terminates at a position on the valve pressing portion.   The reed valve according to claim 4, wherein the hole terminates immediately before a position on the valve pressing portion.   The reed valve according to claim 4, wherein the hole terminates at a boundary between a position applied to the valve pressing portion and a position not applied. A fluid machine comprising the reed valve according to claim 1.

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