JP2023061029A - compressor - Google Patents

Abstract

To provide a compressor capable of suppressing pressure increase of a refrigerant present in a space formed between a discharge valve and a retainer.SOLUTION: A compressor includes: a fixation end plate 31a in which a discharge port 37 communicating a compression chamber with a discharge chamber 35 is formed; a discharge valve 70 for opening/closing a discharge opening 37a located on the discharge chamber 35 side of the discharge port 37; and a retainer 80 regulating bending amount of the discharge valve 70. The retainer 80 includes a through hole 81 penetrating through an upper surface and a lower surface of the retainer 80, and the through hole 81 is formed immediately above the discharge opening 37a and immediately above a portion of the fixation end plate 31a on which the discharge opening 37a is not formed.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to compressors.

For example, in a scroll compressor, which is a type of compressor, a compression chamber in which refrigerant is compressed and a discharge chamber in which the compressed refrigerant is discharged are separated by end plates. A port is formed in the end plate. Further, the end plate is provided with a discharge valve (check valve) that opens and closes the discharge port, and a retainer that regulates the amount of deflection of the discharge valve (see Patent Document 1, for example).

JP 2020-143639 A

The discharge valve closes the discharge port when stopped, and when the pressure in the compression chamber reaches a predetermined pressure or higher, the tip portion bends upward to open the discharge port. Then, when the pressure in the compression chamber drops, it returns to its original position and closes the discharge port again. In other words, during operation of the compressor, the tip portion of the discharge valve repeats reciprocating motion between the end plate and the retainer.

When the pressure in the compression chamber begins to drop and the discharge valve tries to return to its original position (position to close the discharge port), some of the refrigerant in the discharge chamber may flow back into the compression chamber via the discharge port. If the discharge valve closes the discharge port during such backflow, the backflowing refrigerant is blocked by the discharge valve and formed between the discharge valve and the retainer by a principle similar to water hammer. In some cases, the pressure of the refrigerant in the open space rises sharply and the pressure gradient becomes large.

Through analysis, the inventors have found that this pressure gradient tends to propagate in the longitudinal direction of the retainer (the direction from the distal end to the proximal end). Further, the inventors have found that pressure pulsation occurs in the space formed between the discharge valve and the retainer due to the propagation of this pressure gradient, resulting in vibration and noise.

The present disclosure has been made in view of such circumstances, and aims to suppress the pressure rise of the refrigerant in the space formed between the discharge valve and the retainer in order to reduce vibration and noise. aim.

In order to solve the above problems, the compressor of the present disclosure employs the following means.
That is, a compressor according to an aspect of the present disclosure includes a partition wall formed with a discharge port that communicates a compression chamber and a discharge chamber, and a discharge valve that opens and closes a discharge port of the discharge port located on the discharge chamber side. and a retainer for regulating the amount of deflection of the discharge valve, the retainer having a through hole penetrating the upper surface and the lower surface of the retainer, the through hole extending directly above the discharge port and the discharge valve. It is formed directly above the part of the partition where the outlet is not formed.

According to the present disclosure, it is possible to suppress the pressure increase of the refrigerant in the space formed between the discharge valve and the retainer.

1 is a longitudinal cross-sectional view of a compressor according to an embodiment of the present disclosure; FIG. Fig. 3 is a vertical cross-sectional view in the vicinity of a discharge valve and a retainer of the compressor; FIG. 4 is a perspective view of a fixed scroll with a discharge valve and retainer attached; 4 is a plan view of a retainer and a fixed end plate according to Example 1. FIG. FIG. 8 is a plan view of a retainer and a fixed end plate according to Example 2; FIG. 11 is a plan view of a retainer and a fixed end plate according to Example 3; FIG. 11 is a plan view of a retainer and a fixed end plate according to a modification; FIG. 11 is a plan view of a retainer and a fixed end plate according to a modification;

A compressor according to an embodiment of the present disclosure will be described below with reference to the drawings.

[About the compressor]
The compressor 1 is, for example, a scroll compressor included in an air conditioner mounted on a vehicle. In the following description, "compressor 1" is referred to as "scroll compressor 1".
As shown in FIG. 1 , scroll compressor 1 includes housing 10 , compression mechanism 30 , crankshaft 40 and electric motor 50 .

The housing 10 has a motor case 11 , an upper case 12 and a lower case 13 .

The motor case 11 is a cylindrical member made of metal with both ends opened.
The motor case 11 accommodates the compression mechanism 30, the crankshaft 40, and the electric motor 50 inside.

The upper case 12 is a metal member that closes one of the open ends of the motor case 11 .
The upper case 12 is fastened to the motor case 11 and a fixed scroll 31 (described later).

The lower case 13 is a metal member that closes the other open end of the motor case 11 .
Lower case 13 is fastened to motor case 11 .

An inverter cover 13 a is attached to the lower case 13 . A space defined by the lower case 13 and the inverter cover 13a accommodates an inverter (not shown).

A space defined by the housing 10 (motor case 11, upper case 12, and lower case 13) configured as described above accommodates a compression mechanism 30, a crankshaft 40, an electric motor 50, and various other devices.

The compression mechanism 30 is a mechanism that compresses low-pressure gas refrigerant taken from the outside of the housing 10 .
The compression mechanism 30 has a fixed scroll 31 and an orbiting scroll 32 .

The fixed scroll 31 is a member having a fixed end plate (partition wall) 31a and a spiral fixed wall 31b erected from the fixed end plate 31a.
The fixed scroll 31 is fastened to the upper case 12 and defines a discharge chamber 35 with the upper case 12 . A discharge pipe (not shown) is connected to the discharge chamber 35 so that the compressed gas refrigerant can be supplied to the outside of the scroll compressor 1 .

A discharge port 37 is formed in the fixed end plate 31a, and communicates a discharge chamber 35 and a compression chamber 36 (described later) separated by the fixed end plate 31a.
The discharge port 37 is a circular hole penetrating through the fixed end plate 31a in the thickness direction at approximately the center of the fixed end plate 31a (the position corresponding to the space where the pressure of the refrigerant is the highest in the compression chamber 36).

In the discharge chamber 35 , a discharge valve 70 and a retainer 80 that regulates the amount of deflection of the discharge valve 70 are provided at the outlet (discharge port 37 a ) of the discharge port 37 . Details of the discharge valve 70 and the retainer 80 will be described later.

The orbiting scroll 32 is a member having an orbiting end plate 32a and a spiral orbiting wall body 32b erected from the orbiting end plate 32a.
The orbiting scroll 32 is configured to orbit and orbit with respect to the fixed scroll 31 by means of a crankshaft 40 that rotates about the axis X1 and a known anti-rotation mechanism.

The fixed scroll 31 and the orbiting scroll 32 form compression chambers 36 by meshing their walls.
Gas refrigerant taken in from the outside of the housing 10 through a suction pipe (not shown) is introduced into the compression chamber 36 . The compression chamber 36 is configured such that its volume is gradually reduced by the orbital orbital motion of the orbiting scroll 32, and the gas refrigerant is compressed accordingly.

Crankshaft 40 is a member for transmitting driving force from electric motor 50 to orbiting scroll 32 .
The crankshaft 40 has a shaft body 40a and a crankpin 40b. The shaft main body 40 a and the crank pin 40 b are integrally formed as the crank shaft 40 .

The shaft body 40a is a shaft-shaped member extending along the axis X1. The shaft body 40a is rotationally driven by the electric motor 50 around the axis X1.
The shaft body 40a is rotatably supported around the axis X1 by a main bearing 61 arranged on the upper case 12 side and a sub-bearing 62 arranged on the lower case 13 side.

The crankpin 40b is a shaft-shaped member provided at the end of the shaft body 40a.
The crankpin 40b extends along an axis X2 eccentric to the axis X1.

In the crankshaft 40 configured as described above, the crankpin 40b is connected to the orbiting scroll 32, and the shaft body 40a is driven to rotate about the axis X1 by the electric motor 50, whereby the orbiting scroll 32 is driven and the compression mechanism 30 is driven. The gas refrigerant is compressed at .

[Discharge valve and retainer]
As shown in FIGS. 1 and 2 , the discharge valve 70 and retainer 80 are provided in the discharge chamber 35 .

As shown in FIGS. 1 to 3, the discharge valve 70 is a thin plate-like member (reed valve) provided on the surface of the fixed end plate 31a located on the discharge chamber 35 side.
The outer shape of the discharge valve 70 substantially matches the outer shape of the retainer 80 when viewed from above.

The retainer 80 is a plate-like member provided so as to overlap the discharge valve 70 .
As shown in FIGS. 3 and 4, the outer shape of the retainer 80 is a tongue-like shape extending longitudinally from the proximal end 80b toward the distal end 80a when viewed from above.
4, the discharge valve 70 is omitted for simplification of explanation (the same applies to FIGS. 5 to 8).

As shown in FIGS. 2 and 3, the base end 80b of the retainer 80 is fixed to the fixed end plate 31a with bolts 63 with the base end 70b of the discharge valve 70 interposed therebetween. As a result, the discharge valve 70 is fixed together with the retainer 80 to the fixed end plate 31a. A tip 70a of the discharge valve 70 is a free end.

A distal end 80a of the retainer 80 is located above a proximal end 80b, and the outer shape of the retainer 80 is gradually curved from the proximal end 80b toward the distal end 80a when viewed from the side. .

The discharge valve 70 closes the discharge port 37a of the discharge port 37 when the scroll compressor 1 is stopped. The tip 70a bends upward to open the discharge port 37a (discharge valve 70 indicated by a dashed line in FIG. 2). Refrigerant flows from the compression chamber 36 toward the discharge chamber 35 via the discharge port 37 . At this time, the amount of deflection of the discharge valve 70 is regulated by the retainer 80 .
When the pressure in the compression chamber 36 is lowered, the discharge valve 70 returns to its original position and closes the discharge port 37a again.
That is, during operation of the scroll compressor 1 , the tip 70 a of the discharge valve 70 repeats reciprocating motion between the fixed end plate 31 a and the retainer 80 .

In the discharge valve 70 and the retainer 80 configured as described above, when the pressure in the compression chamber 36 begins to decrease and the discharge valve 70 tries to return to its original position (the position where the discharge port 37a is closed), the refrigerant in the discharge chamber 35 may flow back into the compression chamber 36 via the discharge port 37 . If the discharge valve 70 closes the discharge port 37a when such a backflow occurs, the backflowing refrigerant is blocked by the discharge valve 70 and enters the space formed between the discharge valve 70 and the retainer 80. The pressure of a certain refrigerant may rise sharply, resulting in a large pressure gradient.

The inventors have found through analysis and the like that this pressure gradient tends to propagate in the longitudinal direction of the retainer 80 (the direction from the distal end 80a toward the proximal end 80b).

Therefore, in this embodiment, the through hole 81 is formed in the retainer 80 in order to suppress the pressure increase of the refrigerant in the space formed between the discharge valve 70 and the retainer 80 and the propagation of the pressure gradient.
Hereinafter, the configuration of the through hole 81 will be described using a plurality of examples.

[Example 1]
As shown in FIGS. 2 to 4 , the through hole 81 is a hole penetrating the upper surface (front surface) and the lower surface (back surface) of the retainer 80 .

As shown in FIGS. 2 and 4, the through hole 81 is an elongated hole with rounded corners integrally formed from the distal end 80a of the retainer 80 toward the proximal end 80b. extending so as to have a longitudinal direction. Further, the through hole 81 is formed from directly above the discharge port 37a to directly above the portion of the fixed end plate 31a where the discharge port 37a is not formed when viewed from above.

The proximal end 81b of the through hole 81 preferably reaches an intermediate position between the distal end 80a and the proximal end 80b of the retainer 80, or a position closer to the proximal end 80b than the intermediate position.

The through hole 81 configured as described above has a longitudinal dimension (dimension from the distal end 81a to the proximal end 81b) equal to or greater than the diameter of the discharge port 37a, preferably equal to or greater than 1.5 times the diameter of the discharge port 37a. More preferably, it is at least twice the diameter of the discharge port 37a.

However, if the proximal end 81b of the through hole 81 is too close to the proximal end 80b of the retainer 80, the strength of the retainer 80 may be insufficient. be.

[Example 2]
As shown in FIG. 5, the through hole 81 is a hole penetrating the upper surface (front surface) and the lower surface (back surface) of the retainer 80, as in the first embodiment.

The tip 81 a of the through hole 81 may reach the edge of the tip 80 a of the retainer 80 . That is, the through hole 81 may be a notch formed in a U shape from the tip 80 a of the retainer 80 .
Even in this case, the proximal end 81b of the through-hole 81 preferably reaches an intermediate position between the distal end 80a and the proximal end 80b of the retainer 80, or a position closer to the proximal end 80b than the intermediate position.

[Example 3]
As shown in FIG. 6 , the through hole 81 is a hole penetrating the upper surface (front surface) and the lower surface (back surface) of the retainer 80 as in the first and second embodiments.

However, unlike the first and second embodiments, the through hole 81 of this embodiment is not a single hole integrally formed from the distal end 80a of the retainer 80 toward the proximal end 80b, but extends along the longitudinal direction of the retainer 80. It consists of a plurality of circular holes provided along the

According to this embodiment, the following effects are obtained.
Since the retainer 80 has a through hole 81 passing through the upper and lower surfaces of the retainer 80 , the refrigerant in the space formed between the discharge valve 70 and the retainer 80 flows through the through hole 81 into the retainer 80 . It can escape to the upper surface side of 80 . As a result, it is possible to suppress the pressure rise of the refrigerant in the space and the resulting pressure pulsation.

In addition, since the through hole 81 is formed directly above the ejection port 37a and directly above the portion of the fixed end plate 31a where the ejection port 37a is not formed, the pressure including the portion directly above the ejection port 37a where the pressure is likely to rise is reduced. The coolant can escape to the upper surface side of the retainer 80 within the range along the direction in which the gradient is likely to propagate.

Further, as in the first and second embodiments, the through hole 81 is integrally formed along the longitudinal direction of the retainer 80, and the proximal end 81b of the through hole 81 is located between the distal end 80a and the proximal end 80b of the retainer 80. , or a position closer to the base end 80b than the intermediate position, the coolant can escape to the upper surface side of the retainer 80 more efficiently.

[Modification]
As shown in FIG. 7, a notch 82 formed from the side edge of the retainer 80 toward the through hole 81 may be provided.
In this case, a large area (opening area) of the portion that functions as the through hole 81 can be ensured without bringing the through hole 81 close to the base end 80b of the retainer 80, and pressure rise and pressure pulsation resulting therefrom can be further suppressed. can be suppressed.

Further, as shown in FIG. 8 , the through hole 81 itself may be a notch formed from the side edge of the retainer 80 toward the central portion of the retainer 80 .
In this case, the area (opening area) of the portion that functions as the through hole 81 can be secured without bringing the through hole 81 close to the base end 80 b of the retainer 80 .

The embodiment described above can be grasped, for example, as follows.
That is, a compressor (1) according to one aspect of the present disclosure includes a partition wall (31a) formed with a discharge port (37) that communicates a compression chamber (36) and a discharge chamber (35); a discharge valve (70) for opening and closing a discharge port (37a) located on the discharge chamber side of the discharge valve (70); and a retainer (80) for regulating the amount of deflection of the discharge valve. It has a through hole (81) penetrating through the lower surface, and the through hole is formed directly above the ejection port and directly above the portion of the partition wall where the ejection port is not formed.

According to the compressor of this aspect, the partition wall formed with the discharge port communicating the compression chamber and the discharge chamber, the discharge valve opening and closing the discharge port located on the discharge chamber side of the discharge port, and the discharge valve a retainer that regulates the amount of deflection, and the retainer has a through hole penetrating the upper and lower surfaces of the retainer, so that the refrigerant in the space formed between the discharge valve and the retainer can pass through. It can escape to the upper surface side of the retainer through the hole. As a result, it is possible to suppress the pressure rise of the refrigerant in the space and the resulting pressure pulsation.
In addition, since the through-holes are formed directly above the ejection port and directly above the part of the partition wall where the ejection port is not formed, the through-hole is formed in a direction in which the pressure gradient is easily propagated, including directly above the ejection port where the pressure is likely to rise. Refrigerant can escape to the upper surface side of the retainer in the range along.

Further, in the compressor according to one embodiment of the present disclosure, the retainer has a tongue shape extending from a base end (80b) fixed to the partition wall toward a tip end (80a), and the through hole is integrally formed along the extending direction of the retainer from a position directly above the discharge port toward the base end.

According to the compressor of this aspect, the retainer has a tongue shape extending from the proximal end fixed to the partition wall toward the distal end, and the through hole extends along the extending direction of the retainer. Since it is integrally formed from the position directly above the outlet toward the proximal end, it is possible to provide a through hole extending along the direction in which the pressure gradient tends to propagate. As a result, the coolant can be efficiently released to the upper surface side of the retainer.

Also, in the compressor according to an embodiment of the present disclosure, the through hole is integrally formed at least from a position directly above the discharge port to an intermediate position between the tip end and the base end.

According to the compressor according to this aspect, the through hole is integrally formed at least from the position directly above the discharge port to the intermediate position between the tip and the base end, so that the pressure gradient is easily propagated along the direction through-holes of sufficient dimensions can be provided. As a result, the coolant can be efficiently released to the upper surface side of the retainer.

Also, in the compressor according to an embodiment of the present disclosure, the through hole has a notch shape extending from the edge of the distal end of the retainer toward the proximal side.

According to the compressor of this aspect, the through-hole has a notch shape extending from the edge of the tip of the retainer toward the base end, so that the through-hole has a further sufficient dimension along the direction in which the pressure gradient tends to propagate. can be provided with a through hole having a As a result, the coolant can be efficiently released to the upper surface side of the retainer.

1 scroll compressor 10 housing 11 motor case 12 upper case 13 lower case 13a inverter cover 30 compression mechanism 31 fixed scroll 31a fixed end plate (partition wall)
31b fixed wall 32 orbiting scroll 32a orbiting end plate 32b orbiting wall 35 discharge chamber 36 compression chamber 37 discharge port 37a discharge port 40 crankshaft 40a shaft body 40b crank pin 50 electric motor 61 main bearing 62 sub-bearing 70 discharge valve 70a tip 70b Proximal end 80 Retainer 80a Distal end 80b Proximal end 81 Through hole 81a Distal end 81b Proximal end

Claims (4)

a partition formed with a discharge port communicating between the compression chamber and the discharge chamber;
a discharge valve for opening and closing a discharge port located on the discharge chamber side of the discharge port;
a retainer that regulates the amount of deflection of the discharge valve;
with
the retainer has a through hole penetrating the upper surface and the lower surface of the retainer;
The through hole is formed directly above the discharge port and directly above the portion of the partition wall where the discharge port is not formed. the retainer has a tongue-like shape extending from a proximal end fixed to the septum toward a distal end;
2. The compressor according to claim 1, wherein said through hole is integrally formed along the extending direction of said retainer from a position directly above said discharge port toward said base end. 3. The compressor according to claim 2, wherein the through-hole is integrally formed at least from a position directly above the discharge port to an intermediate position between the tip end and the base end. 4. The compressor according to claim 2 or 3, wherein the through hole has a notch shape extending from the edge of the tip of the retainer toward the base end.

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