JP2017053302A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a pressure loss of a channel in a release vale device, while sufficiently ensuring an area of a release valve receiving portion.SOLUTION: A scroll compressor is equipped with a compressor mechanism portion in which a base plate, a fixed scroll 18, and a turning scroll are engaged to form a compression chamber 2a; a sealed container; and a discharge pressure space 20 in which a working fluid compressed by the compression mechanism portion flows. The scroll compressor is also equipped with: a release hole 22 which is formed on a base plate of the fixed scroll, and is communicated with the compression chamber; a release valve chamber 27 which communicates the release hole and the discharge pressure space; and a release valve device 21 which is provided in the release valve chamber, and makes the working fluid from the compression chamber into the discharge pressure space. The release valve device is equipped with a release valve 23 opening/closing the release hole, and a release valve receiver 25 for receiving the release valve. The release valve receiver is equipped with an inner peripheral side release valve receiving portion and an outer peripheral side release valve receiving portion. On an outer peripheral side than the outer peripheral side release valve receiving portion, an outer peripheral channel 25e communicating the release valve chamber and the discharge pressure space is provided.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor provided with a release valve device for preventing overcompression.

  As a background art in this technical field, there is WO2014 / 174655 (Patent Document 1). The thing of this patent document 1 is equipped with the release valve apparatus which flows a working fluid from a compression chamber to a discharge pressure space by connecting a compression chamber and the discharge pressure space of the upper part of a fixed scroll, and a release valve apparatus is a compression chamber, A release valve that opens and closes the flow path of the release hole that communicates, a release valve receiver that receives the release valve when the release valve opens, and a presser that holds the release valve receiver from above when the release valve releases pressure. It is described that it consists of.

The release valve receiver includes a first release valve receiving portion provided on the inner peripheral side and a second release valve receiving portion disposed on the outer peripheral side, and the outer peripheral side of the release valve receiver. A plurality of relief holes are formed, and the second release valve receiving portion is disposed on substantially the same circle of the plurality of relief holes and is formed in a place where the plurality of relief holes are not formed. It is described that.
As a result, it is described that a sufficient flow path for the working fluid can be secured, and the surface that receives the release valve in the release valve receiver can be enlarged, thereby improving the reliability.

WO2014 / 174655

  The release valve device disclosed in Patent Document 1 includes a first release valve receiving portion provided on the inner peripheral side of the release valve receiver, and a second release valve receiving portion disposed on the outer peripheral side thereof. And a plurality of relief holes are formed on the outer peripheral side of the release valve receiver. The second release valve receiving portion is disposed on substantially the same circle of the plurality of escape holes, and is formed in a portion where the plurality of escape holes are not formed. It is described that with this configuration, it is possible to sufficiently secure the flow path of the working fluid and to enlarge the area of the release valve receiver that receives the release valve, thereby ensuring reliability.

However, in the thing of the said patent document 1, the following points are not considered.
That is, when the release valve that opens and closes the flow path of the release hole is opened and the working fluid in the compression chamber is discharged to the discharge pressure space, the oil that lubricated the compression chamber flows into the release valve chamber together with the gas. Therefore, when the release valve is released (when the release flow path is opened), the gas and oil also flow out from the outer peripheral side of the release valve into the release valve chamber, and a part of the gas and oil is added to the second valve. After passing between the release valve receiving portion and the back side of the release valve and flowing through the plurality of relief holes, the discharge valve is discharged into the discharge pressure space. As described above, oil is caught between the second release valve receiving portion and the release valve, and the opening operation of the release valve is deteriorated due to the biting of the oil, and the responsiveness of the release valve device is reduced. Deteriorate. For this reason, there exists a subject that the performance of a scroll compressor falls.

  Further, as described in Patent Document 1, in a release valve device including release valve receiving portions on the inner peripheral side and the outer peripheral side of a release valve receiver, gas and oil are released from the release valve when the release valve is released. Flow into the release valve chamber, pass between the second release valve receiving portion and the back side of the release valve, flow into the plurality of relief holes, and then into the discharge pressure space. It is configured to be discharged. For this reason, the flow path until the oil caught between the second release valve receiving portion and the back side of the release valve is discharged to the discharge pressure space side is bent in the circumferential direction in the release valve chamber. There is also a problem that the pressure loss increases and it becomes difficult to discharge oil to the discharge pressure space.

  An object of the present invention is to provide a scroll compressor that can improve the performance by reducing the pressure loss of the flow path in the release valve device while sufficiently securing the area of the release valve receiving portion in the release valve device. There is.

  In order to achieve the above object, the present invention includes a compression mechanism part in which a fixed scroll having a base plate and a scroll wrap and a turning scroll are meshed to form a compression chamber, a sealed container for accommodating the compression mechanism part, A scroll compressor having a discharge pressure space formed in a sealed container and into which a working fluid compressed by the compression mechanism portion flows, is formed on a base plate of the fixed scroll, and communicates with the compression chamber. A release hole, a release valve chamber that communicates the release hole and the discharge pressure space, and a release valve chamber that is provided in the release valve chamber, and allows the working fluid to flow from the compression chamber by communicating the compression chamber and the discharge pressure space. A release valve device that flows into the discharge pressure space, the release valve device opening and closing the release hole, and receiving the release valve when the release valve is opened The release valve receptacle includes an inner circumferential release valve receptacle and an outer circumferential release valve receptacle, and the release valve chamber is located on the outer circumferential side of the outer circumferential release valve receptacle. And an outer peripheral flow path communicating with the discharge pressure space.

  ADVANTAGE OF THE INVENTION According to this invention, the scroll compressor which can aim at the performance improvement by reducing the pressure loss of the flow path in a release valve apparatus, ensuring the area of the release valve receiving part in a release valve apparatus enough is obtained. There is an effect that can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a first embodiment of a scroll compressor according to the present invention. The longitudinal cross-sectional view which shows an example of a general release valve apparatus. The top view which looked at the release valve receptacle of the release valve apparatus shown in FIG. 2 from the upper side. The bottom view which looked at the release valve receptacle of the release valve apparatus shown in FIG. 2 from the lower side. The figure which shows the state which the release valve opened in the release valve apparatus shown in FIG. 2, and also showed the flow of the working fluid. The figure explaining the flow of the oil at the time of the opening start of a release valve in the release valve apparatus shown in FIG. The longitudinal cross-sectional view which shows the release valve apparatus in Example 1 of the scroll compressor of this invention. The top view which looked at the release valve receptacle of the release valve apparatus shown in FIG. 7 from the upper side. The bottom view which looked at the release valve receptacle of the release valve apparatus shown in FIG. 7 from the lower side. The figure explaining the flow of the oil at the time of the opening start of a release valve in the release valve apparatus shown in FIG. The longitudinal cross-sectional view which shows the release valve apparatus in Example 2 of the scroll compressor of this invention. The top view which looked at the release valve apparatus shown in FIG. 11 from the upper side. The bottom view which looked upwards from the lower end part of the release valve receptacle of the release valve apparatus shown in FIG. The figure explaining the flow of the oil at the time of the opening start of a release valve in the release valve apparatus shown in FIG.

  Hereinafter, specific examples of the scroll compressor of the present invention will be described with reference to the drawings. Note that, in each drawing, the portions denoted by the same reference numerals indicate the same or corresponding portions.

A scroll compressor according to a first embodiment of the present invention will be described with reference to FIGS. 2-6 is a figure for demonstrating the general release valve apparatus corresponding to this invention.
First, the overall structure of the scroll compressor according to the first embodiment will be described with reference to FIG.
The scroll compressor 1 is configured by storing a compression mechanism 2 for forming a compression chamber 2a, an electric motor 3, and the like in a sealed container 4.

  The compression mechanism section 2 includes a frame 11 fixed to the sealed container 4 by welding or the like, a fixed scroll 18 having a scroll wrap fixed to the frame 11 with bolts, and a turning scroll having a scroll wrap meshing with the fixed scroll 2. 19 or the like.

  The electric motor 3 includes a stator 3a and a rotor 3b, and is driven by an electric input from an inverter (not shown) via a power supply terminal 16. A crankshaft 10 is fixed to the rotor 3b, and the rotating action of the electric motor 9 is transmitted to the crankshaft 10.

  The crankshaft 10 includes a main shaft portion 10 a that is rotatably supported by a main bearing 13 provided on the frame 11, a sub shaft portion 10 b that is rotatably supported by a sub bearing 14, and the orbiting scroll 19. It is composed of an eccentric pin portion 10c that is inserted into and engaged with a boss portion on the back side. The sub bearing 14 is provided on the sub frame 12 fixed to the lower portion of the hermetic container 4 via a sub bearing housing 15.

  Note that 18a is a suction port formed on the outer peripheral side of the fixed scroll 18, 18b is a discharge port formed near the center of the fixed scroll 18, and 5 is provided through the sealed container 4. The suction pipe 6 connected to the suction port 18a is a discharge pipe provided through the sealed container 4.

  Reference numeral 20 denotes a discharge pressure space formed in the upper part of the closed container 4 and into which discharge gas (working fluid) discharged from the discharge port 18b of the fixed scroll 18 flows. Reference numeral 7 denotes the electric motor 3. The discharge gas discharged into the discharge pressure space 20 in the motor chamber flows into the motor chamber 7 through the passage formed in the outer periphery of the fixed scroll 18 and the frame 11, and then the discharge pipe 6 To the outside (condenser side of the refrigeration cycle).

  Reference numeral 17 denotes an oil reservoir formed in the lower part of the sealed container 4, and 8 denotes an oil reservoir provided in the oil reservoir 17. The oil reservoir is formed in an oil supply hole (not shown) formed in the crankshaft 10. An oil supply pump 9 for supplying the oil 17 includes oil (lubricating oil) supplied to the main bearing 13 and the orbiting bearing provided on the boss portion on the back of the orbiting scroll 19 to the oil reservoir 17. It is an oil drain pipe for returning.

  Furthermore, 21 is a release valve device provided in the fixed scroll 21. This release valve device 21 is used when the pressure in the compression chamber 2a becomes an overcompressed state. Oil is released to the discharge pressure chamber 20 side. Reference numeral 26 denotes a press plate for pressing the release valve device 21, and 28 denotes a fixing bolt for fixing the press plate 26 to the fixed scroll 18. The release valve device 21 will be described later in detail.

  The oil in the oil reservoir 17 is supplied to the sliding portions of the main bearing 13, the auxiliary bearing 14, the fixed scroll 18 and the orbiting scroll 19 to lubricate these sliding portions. Moreover, by letting oil flow into the compression chamber 2a, the sealing performance in the compression chamber 2a is improved, and the working fluid is prevented from leaking to the compression chamber 2a on the lower pressure side. As a result, it is possible to suppress the high-temperature working fluid in the high-pressure side compression chamber from leaking to the low-pressure side and heating or recompressing the working fluid in the low-pressure side compression chamber, thereby reducing thermal fluid loss. .

  When the electric motor 3 rotates, the orbiting scroll 19 is orbited through the crankshaft 10 to reduce the volume of the compression chamber 2 a formed by the fixed scroll 18 and the orbiting scroll 19. Along with this operation, a working fluid (refrigerant gas) from the evaporator side of the refrigeration cycle is sucked from the suction pipe 5 and flows into the compression chamber 2a through the suction port 18a to compress the working fluid. Is done. Thereafter, the compressed working fluid is discharged together with oil from the discharge port 18b to the discharge pressure space 20 in the sealed container 4, and then flows to the motor chamber 7 side to separate the oil. The separated oil flows down to the oil reservoir 17, and the compressed working fluid (refrigerant) is sent from the sealed container 4 to the condenser side of the refrigeration cycle via the discharge pipe 6.

Next, the configuration of the release valve device 21 will be described. The release valve device 21 is for allowing working fluid to escape from the compression chamber 2a to the discharge pressure space 20 during overcompression when the pressure in the compression chamber 2a is equal to or higher than the discharge pressure. By overflowing the working fluid, over-compression can be prevented, and power consumption can be reduced, bearing load can be reduced, and the scroll wrap can be prevented from being damaged.
The release valve device 21 is disposed at a plurality of locations of the fixed scroll 18 corresponding to the plurality of compression chambers 2 a formed by the fixed scroll 18 and the orbiting scroll 19.

  From the suction port 18a of the fixed scroll 18, gas refrigerant, mist-like lubricating oil, and liquid refrigerant or the like depending on operating conditions are drawn into the compression chamber 2a as working fluid. Due to the orbiting motion of the orbiting scroll 19, in the process where the working fluid is compressed, the pressure in the compression chamber 2 a may become overcompressed so as to be equal to or higher than the discharge pressure. The release valve device 21 is closed when in an operating state in which overcompression does not occur, but the release valve device 21 is opened during overcompression. Thereby, the compression chamber 2a and the discharge pressure space 20 communicate with each other, and the working fluid can escape from the compression chamber 2a to the discharge pressure space 20.

  Before describing the release valve device 21 of the present embodiment, first, a general release valve device will be described with reference to FIGS. 2 is a longitudinal sectional view showing an example of a general release valve device, FIG. 3 is a plan view of the release valve receiver of the release valve device shown in FIG. 2 as viewed from above, and FIG. 4 is a diagram of the release valve device shown in FIG. FIG. 5 is a bottom view of the release valve receiver as viewed from below, FIG. 5 is a view showing a state in which the release valve is opened in the release valve device shown in FIG. 2, a view showing the flow of working fluid, and FIG. It is a figure explaining the flow of the oil at the time of the opening start of a release valve in a release valve apparatus.

  As shown in FIG. 2, a release hole 22 communicating with the compression chamber 2 a, the release hole 22, and the discharge pressure space 20 communicate with the base plate portion of the fixed scroll 18, and the release valve device 21. A release valve chamber 27 is formed for arranging the. The release hole 22 is formed to have a smaller diameter than the scroll wrap thickness of the orbiting scroll 19, and the release valve chamber 27 is formed as a large diameter hole with respect to the release hole 22.

  The volume of the release hole 22 becomes a part of the volume of the compression chamber 2a, and becomes a dead volume accompanied by re-expansion loss of the gas remaining in the compression stroke. For this reason, it is preferable to suppress the volume of the release hole 22 as much as possible. The release valve chamber 27 needs to have a sufficient release flow path so as not to impair the function of releasing the working fluid released from the compression chamber 2a. For this reason, the diameter of the hole forming the release valve chamber 27 is larger than that of the release hole 22.

  The release valve device 21 opens and closes the release hole 22 that communicates with the compression chamber 2a, and when the release valve 23 is closed, the release valve 23 closes the flow path of the release hole 22. An elastic body (coil spring in this example) 24 to be pressed, a release valve receiver 25 for holding the elastic body 24 and receiving the release valve 23 when the release valve 23 is opened, and the release valve receiver 25 And a release plate 26 that presses the release valve receiver 25 so that the release valve 23 does not move toward the discharge pressure space 20.

  The release valve receiver 25 is manufactured by molding with sintered metal, carbon steel, or the like, and as shown in FIGS. 3 and 4, a central relief passage 25a provided in the center and an outer peripheral side relief provided on the outer peripheral side. A flow path 25b is formed. Further, the outer peripheral side escape passage 25b is formed at three equal intervals around the central escape passage 25a.

  Further, the release valve receiver 25 is provided with a convex portion that protrudes toward the compression chamber 2a on the center lower side, and one end side of the elastic body 24 is inserted into the convex portion by means such as press fitting. It is attached and fixed. The convex portion is formed to have a diameter that decreases toward the compression chamber 2a.

  The release valve 23 is attached to the lower end of the elastic body 24, and the release valve 23 is configured to be urged toward the compression chamber 2 a by the elastic body 24. An annular valve seat portion for receiving the release valve 23 when the release valve 23 is closed is formed around the release hole 22 in the bottom portion of the release valve chamber 27. Therefore, when the release valve 23 is closed, the release valve 23 is urged by the elastic body 24 to come into contact with the valve seat portion and close the release hole 22. The release valve 23 has a disc shape or an elliptical shape with a different diameter.

Further, the release valve receiver 25 is provided with a valve receiving portion for receiving the release valve 23 when the release valve 23 is opened.
That is, the release valve receiver 25 is provided with an inner peripheral release valve receiver 25c at the tip of the convex portion described above, and an outer peripheral release valve receiver 25d is provided on the outer peripheral side thereof. As shown in FIG. 4, the outer peripheral side release valve receiving portions 25d are formed at three equal intervals around the inner peripheral release valve receiving portion 25c. In addition, the said outer peripheral side relief flow path 25b is formed between the said outer peripheral side release valve receiving parts 25d provided with two or more by the circumferential direction.

  When the compression chamber 2a is overcompressed and the pressure acting on the release valve 23 exceeds the urging force of the elastic body 24, the release valve 23 is opened and lifted upward, as shown in FIG. Thus, it is received by the inner peripheral side release valve receiving part 25c and the outer peripheral side release valve receiving part 25d.

  FIG. 5 shows a state in which the release valve 23 is opened in a general release valve device 21. When the release valve 23 is opened, the working fluid in the compression chamber 2a is released into a release hole as indicated by an arrow. 22, flows into the release valve chamber 27 through the outer peripheral side of the release valve 23, passes through the central relief flow path 25 a and the outer peripheral relief flow path 25 b formed in the release valve receiver 25. And released into the discharge pressure space 20. In this way, a release flow path for the working fluid is formed by the release valve device 21 from the release hole 22 to the release valve chamber 27, the central relief flow path 25a, and the internal relief flow path 25b.

  When the release flow path is formed, the release valve 23 is separated from the valve seat portion, the working fluid flows from the compression chamber 2a side to the discharge pressure space 20, and the release valve 23 further includes the release valve. It moves so as to contact the inner peripheral side release valve receiving part 25c and the outer peripheral side release valve receiving part 25d at the lower part of the receiving part 25.

  In the state where the release flow path is formed and the pressure in the compression chamber 2a is released, the oil that has lubricated the compression chamber 2a also flows into the release valve chamber 27 at the same time. Therefore, when the release valve 23 is opened, oil biting occurs between the back side of the release valve 23 and the release valve receiving portions 25c and 25d. It has been found that the opening operation of 23 is deteriorated, the responsiveness of the release valve device 21 is deteriorated, and the performance of the scroll compressor is deteriorated.

  6 shows that the release valve device 21 illustrated in FIGS. 2 to 5 is engaged between the release valve 23 and the outer peripheral release valve receiving portion 25d when the release valve 23 starts to open. The flow until the oil is discharged into the discharge pressure space 20 is shown. As shown in FIG. 6, the oil bitten into the outer peripheral release valve receiving portion 25 flows in the circumferential direction on the lower end surface of the outer peripheral release valve receiving portion 25, and from the circumferential end to the outer periphery. It enters the outer peripheral relief passage 25 b formed between the side release valve receiving portions 25 and is discharged into the discharge pressure space 20. Since the flow path until the oil is discharged is bent in the circumferential direction with respect to the flow path from the compression chamber 2 to the discharge pressure space 20, pressure loss occurs due to the bending of the flow path, and the discharge pressure space There is also a problem that it is difficult to discharge oil to the 20 side.

  Therefore, the first embodiment of the scroll compressor according to the present invention is configured as shown in FIGS. 7-10 is a figure for demonstrating the release valve apparatus 21 of this Example 1, FIG. 7 is a longitudinal cross-sectional view which shows the release valve apparatus in Example 1 of the scroll compressor of this invention, FIG. FIG. 9 is a plan view of the release valve receiver of the release valve device shown in FIG. 7 as viewed from above, FIG. 9 is a bottom view of the release valve receiver of the release valve device as shown in FIG. 7, and FIG. It is a figure explaining the flow of the oil at the time of the opening start of a release valve in a valve apparatus.

7 to 10, the basic parts are the same as those of the release valve device 21 shown in FIGS. 2 to 4 described above. Therefore, the parts different from those in FIGS. The description of the portions that are present is basically omitted.
The release valve device 21 according to the first embodiment mainly differs from the release valve device 21 described with reference to FIGS.

  As shown in FIGS. 7 to 9, the release valve receiver 25 in the present embodiment is similar to the one described with reference to FIGS. 2 to 4. A valve receiver 25c and an outer peripheral release valve receiver 25d are provided. Further, the present embodiment is characterized in that an outer peripheral flow path 25e is provided on the outer peripheral side from the outer peripheral release valve receiving portion 25d.

  As shown in FIG. 10, the outer peripheral flow path 25 e allows the working fluid or oil that has flowed out from the outer peripheral side of the release valve 23 to flow to the discharge pressure space 20 almost straight without having a bent portion. The release valve receiver 25 is formed on the outer peripheral side from the outer peripheral release valve receiver 25d.

  By providing the outer peripheral flow path 25e in the release valve receiver 25, the working fluid and oil flowing into the release valve chamber 27 from the outer peripheral side of the release valve 23 are released from the outer peripheral side as indicated by arrows in FIG. From the outer peripheral side of the valve receiving portion 25d, it can rise straight and flow into the outer peripheral flow path 25e and flow out from here to the discharge pressure space 20.

  Therefore, the working fluid and oil in the compression chamber 2a can be prevented from bending in the circumferential direction after flowing into the release valve chamber 27, and the back side of the release valve 23 and the release valve receiving portions 25c and 25d The oil can be prevented from being caught between the two. As a result, the pressure loss of the release flow path that flows through the release valve device 21 and flows into the discharge pressure space 20 can be reduced, and the oil can be efficiently discharged to the discharge pressure space 20. Further, since the release valve 23 can be prevented from deteriorating its operation due to the biting of oil, the responsiveness of the release valve device 21 is also improved. Therefore, according to the present embodiment, the performance of the scroll compressor can be improved.

In addition, according to the present embodiment, since not only the inner peripheral release valve receiving portion 25c but also the outer peripheral release valve receiving portion 25d is provided, the area of the release valve receiving portion in the release valve device 21 can be sufficiently ensured. There is also an effect.
Other configurations are the same as those shown in FIGS.

  A scroll compressor according to a second embodiment of the present invention will be described with reference to FIGS. 11 is a longitudinal sectional view showing a release valve device according to a second embodiment of the scroll compressor of the present invention, FIG. 12 is a plan view of the release valve device shown in FIG. 11, and FIG. 13 is a release valve shown in FIG. FIG. 14 is a view for explaining the flow of oil when the release valve starts to open in the release valve device shown in FIG. 11.

  The second embodiment is different from the first embodiment described above in the configuration of the release valve receiver 25 of the release valve device 21 and the configuration in which the release valve receiver 25 is fixed to the fixed scroll 18. Since the other configuration is basically the same as that of the first embodiment, the description of the same portion is omitted.

  In the first embodiment, due to the processing accuracy of the fixed scroll 18 and the release valve receiver 25, a gap is created between the release valve receiver 25 and the presser plate 26 so that the release valve receiver 25 can move in the vertical direction. Thus, when the release valve 23 is opened, the release valve receiver 25 is also pushed upward simultaneously with the release valve 23, and the release valve receiver 25 and the presser plate 26 collide with each other. For this reason, it has been found that there is a problem in that wear occurs on the collision surface between the release valve receiver 25 and the presser plate 26 and the reliability of the release valve receiver 25 and the presser plate 26 is lowered.

  Therefore, in the second embodiment, the presser plate 26 and the release valve receiver 25 in the first embodiment are integrated. That is, as shown in FIGS. 11 to 13, a protruding portion that extends horizontally is integrally provided at the upper end portion (end portion on the discharge pressure space 20 side) of the release valve receiver 25, and this protruding portion is provided as the fixed scroll 18. These are fixed to the base plate with fixing bolts 28. Thus, the release valve receiver 25 is restrained from moving toward the discharge pressure space 20, and the release valve device 21 is installed in the release valve chamber 27 formed on the base plate of the fixed scroll. is there.

  Further, the central relief passage 25a, the outer peripheral relief passage 25b, and the outer peripheral passage 25e provided on the outer peripheral side of the outer release valve receptacle 25c are formed in the release valve receptacle 25. Is formed so as to penetrate through to the upper end portion (end portion on the discharge pressure space 20 side) of the gas and open to the discharge pressure space 20.

  By configuring in this way, the same effects as in the first embodiment can be obtained, and the collision between the release valve receiver 25 and the presser plate 26 does not occur as in the first embodiment. Release valve device 21 can be realized, and high reliability can be obtained.

Further, since the press plate 26 is integrated with the release valve receiver 25, it is not necessary to secure a contact surface between the release valve receiver 25 and the press plate 26 as in the first embodiment. As shown in FIG. 11, the release valve chamber 27 can be formed to expand to the inner peripheral surface. As a result, the cross-sectional area of the outer peripheral flow path 25e can be increased, and oil can be efficiently discharged to the discharge pressure space 20. Therefore, according to the second embodiment, the responsiveness of the release valve device 21 can be further improved, and the performance of the scroll compressor can be improved.
Other configurations are the same as those of the first embodiment.

  Each embodiment of the scroll compressor according to the present invention described above is particularly suitable for a refrigeration cycle apparatus using a refrigerant containing R32 in an amount of 70% by weight or more as a working fluid (refrigerant). When a refrigerant containing 70% by weight or more of R32 is used as a working fluid of a refrigeration cycle apparatus such as an air conditioner, the adiabatic index is large and the discharge gas temperature is higher than when a refrigerant having R32 of less than 70% by weight is used. Becomes higher. For this reason, since it is necessary to suppress the temperature of the scroll compressor, for example, the refrigerant sucked into the compressor is often operated under a liquid return condition (wet state). As a result, a liquid compression state is likely to occur in the compression chamber, and overcompression is likely to occur.

  By using such a refrigeration cycle apparatus with a scroll compressor as shown in the first or second embodiment, a large amount of liquid refrigerant is contained in the working fluid sucked into the compressor, resulting in liquid compression and excessive compression. Even if it occurs, since the release valve device 21 operates with good responsiveness, the load on the scroll wrap can be suppressed, and the reliability of the scroll compressor can be enhanced. That is, since the working fluid containing oil passing through the release valve device 21 is easily discharged into the discharge pressure space 20, even if overcompression occurs due to liquid compression, the release valve 23 and the rear surface are released. Since it is possible to prevent the oil from being caught between the valve receiving portions 25c and 25d, the release valve device 21 can be operated quickly, and the oil and the working fluid can be quickly discharged into the discharge pressure space 20.

  In addition, this invention is not limited to the Example mentioned above, Various modifications are included. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Scroll compressor, 2 ... Compression mechanism part, 2a ... Compression chamber,
3 ... Electric motor, 3a ... Rotor, 3b ... Stator,
4 ... Sealed container, 5 ... Suction pipe, 6 ... Discharge pipe,
7 ... Electric motor room, 8 ... Oil pump, 9 ... Oil drain pipe,
DESCRIPTION OF SYMBOLS 10 ... Crankshaft, 10a ... Main shaft part, 10b ... Subshaft part, 10c ... Eccentric pin part,
11 ... frame, 12 ... sub-frame,
13 ... Main bearing, 14 ... Sub bearing, 15 ... Sub bearing housing,
16 ... Power terminal, 17 ... Oil sump,
18 ... fixed scroll, 18a ... suction port, 18b ... discharge port,
19 ... orbiting scroll,
20 ... discharge pressure space, 21 ... release valve device,
22 ... Release hole, 23 ... Release valve,
24 ... Elastic body (coil spring), 25 ... Release valve receptacle,
25a ... central escape passage, 25b ... outer peripheral escape passage,
25c ... Inner circumference release valve receptacle, 25d ... Outer circumference release valve receptacle,
25e ... outer peripheral flow path, 26 ... presser plate,
27 ... Release valve chamber, 28 ... Fixing bolt.

Claims (10)

A compression mechanism portion that forms a compression chamber by meshing a fixed scroll having a base plate and a scroll wrap and a turning scroll, a sealed container that accommodates the compression mechanism portion, and formed in the sealed container. A scroll compressor having a discharge pressure space into which a compressed working fluid flows,
A release hole formed in the base plate of the fixed scroll and communicating with the compression chamber; a release valve chamber communicating with the release hole and the discharge pressure space;
Provided in this release valve chamber, comprising a release valve device for flowing a working fluid from the compression chamber to the discharge pressure space by communicating the compression chamber and the discharge pressure space,
The release valve device includes a release valve that opens and closes the release hole, and a release valve receiver that receives the release valve when the release valve is opened.
The release valve receiver includes an inner peripheral release valve receiver and an outer peripheral release valve receiver, and communicates the release valve chamber and the discharge pressure space on the outer peripheral side of the outer peripheral release valve receiver. A scroll compressor characterized in that an outer peripheral flow path is provided.   2. The scroll compressor according to claim 1, wherein the release valve receiver communicates with the release valve chamber and the discharge pressure space, a central relief passage provided on a central side, and an outer periphery provided on an outer peripheral side. A scroll compressor comprising a side relief passage.   3. The scroll compressor according to claim 2, wherein a plurality of the outer peripheral relief passages are provided in a circumferential direction, and the outer peripheral release valve receiving portion and the outer peripheral flow are provided between the plural outer peripheral relief passages. A scroll compressor characterized in that a path is provided.   4. The scroll compressor according to claim 3, wherein a plurality of the outer peripheral release valve receiving portions are provided in a circumferential direction, and the outer peripheral flow paths are respectively provided on the outer peripheral sides of the plurality of outer peripheral release valve receiving portions. A scroll compressor characterized by that.   2. The scroll compressor according to claim 1, wherein a base plate of the fixed scroll is provided with a press plate for pressing the release valve receiver to move toward the discharge pressure space. Machine.   The scroll compressor according to claim 1, wherein the release valve receiver is integrally provided with a protruding portion at an end portion of the discharge pressure space, and the protruding portion is fixed to the base plate of the fixed scroll. A scroll compressor characterized in that the release valve receptacle is configured to suppress movement toward the discharge pressure space.   The scroll compressor according to claim 6, wherein the outer peripheral flow path provided on the outer peripheral side of the outer peripheral side release valve receiving portion is provided to penetrate to the discharge pressure space side end portion of the release valve receiver, A scroll compressor characterized by being formed to open into a discharge pressure space.   The scroll compressor according to claim 7, wherein the outer peripheral flow path is formed up to an inner peripheral surface of the release valve chamber.   8. The scroll compressor according to claim 7, wherein the release valve receiver includes a central relief channel provided on a central side and an outer peripheral relief channel provided on an outer peripheral side, and the central relief channel and the outer periphery are provided. A scroll compressor characterized in that a side relief flow path is also provided penetrating to the discharge pressure space side end of the release valve receptacle and is open to the discharge pressure space.   2. The scroll compressor according to claim 1, wherein the scroll compressor is used as a compressor of a refrigeration cycle apparatus using a working fluid containing 70 wt% or more of refrigerant R32.

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