JP6640504B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor having a release valve device for preventing over-compression.

  As a background art of this technical field, there is WO2014 / 174655 (Patent Document 1). The device disclosed in Patent Document 1 is provided with a release valve device that allows the working fluid to flow from the compression chamber to the discharge pressure space by communicating the compression chamber with the discharge pressure space above the fixed scroll. A release valve that opens and closes the flow path of the communicating release hole, a release valve receiver that receives the release valve when the release valve opens, and a holding unit that presses the release valve receiver from above when the release valve release pressure. Is described.

Further, the release valve receiver has a first release valve receiver provided on the inner peripheral side and a second release valve receiver disposed on the outer peripheral side, and an outer peripheral side of the release valve receiver. A plurality of relief holes are formed, and the second release valve receiving portion is arranged on substantially the same circle as the plurality of relief holes, and is formed at a place where the plurality of relief holes are not formed. Is described.
It is described that by this, a sufficient flow path of the working fluid can be ensured, the surface for receiving the release valve in the release valve receiver can be enlarged, and the reliability can be improved.

WO2014 / 174655

  The release valve device disclosed in Patent Literature 1 includes a first release valve receiver provided on an inner peripheral side of a release valve receiver, and a second release valve receiver disposed on an 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 as the plurality of relief holes, and is formed at a portion where the plurality of relief holes are not formed. According to this configuration, it is described that the flow path of the working fluid can be sufficiently secured, and the area of the release valve receiver that receives the release valve can be increased, thereby ensuring reliability.

However, the one described in Patent Document 1 does not consider the following points.
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 has lubricated the compression chamber also flows into the release valve chamber together with the gas. Therefore, when the release valve is released (when the release passage is opened), the oil flows together with the gas from the outer peripheral side of the release valve into the release valve chamber, and a part of the gas and the oil is supplied to the second valve. After passing between the release valve receiving portion and the back side of the release valve and flowing to the plurality of relief holes, the air is discharged to the discharge pressure space. As described above, the bite of the oil occurs between the second release valve receiving portion and the release valve, and the biting of the oil deteriorates the opening operation of the release valve, and the responsiveness of the release valve device is reduced. become worse. For this reason, there is a problem that the performance of the scroll compressor is reduced.

  Further, as described in Patent Literature 1, in a release valve device having release valve receiving portions on an inner peripheral side and an outer peripheral side of a release valve receiver, when the release valve is released, gas and oil are released by the release valve. Flows from the outer peripheral side into the release valve chamber, passes between the second release valve receiving portion and the back side of the release valve, flows into the plurality of relief holes, and then flows 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. In addition, there is also a problem that the pressure loss increases and it becomes difficult to discharge the oil to the discharge pressure space.

  An object of the present invention is to provide a scroll compressor capable of improving 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. It is in.

  In order to achieve the above object, the present invention provides a compression mechanism section in which a fixed scroll having a base plate and a scroll wrap and an orbiting scroll are engaged with each other to form a compression chamber, a sealed container accommodating the compression mechanism section, A scroll compressor having a discharge pressure space formed in an airtight container and into which the working fluid compressed by the compression mechanism flows, wherein the scroll compressor 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 with the discharge pressure space, and a release valve chamber that is provided in the release valve chamber and communicates the working fluid from the compression chamber by communicating the compression chamber with the discharge pressure space. A release valve device that opens and closes the release hole, the release valve device receiving the release valve when the release valve is opened; A release valve receiver, the release valve receiver includes an inner peripheral side release valve receiver and an outer peripheral side release valve receiver, and the release valve chamber is provided on an outer peripheral side of the outer peripheral side release valve receiver. 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 reduce the pressure loss of the flow path in a release valve apparatus, and can aim at performance improvement, securing sufficient area of the release valve receiving part in a release valve apparatus is obtained. There is an effect that can be.

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. FIG. 4 is a longitudinal sectional view showing an example of a general release valve device. FIG. 3 is a plan view of a release valve receiver of the release valve device shown in FIG. 2 as viewed from above. FIG. 3 is a bottom view of the release valve receiver of the release valve device shown in FIG. 2 as viewed from below. FIG. 3 is a diagram illustrating a state in which a release valve is opened in the release valve device illustrated in FIG. 2 and also illustrates a flow of a working fluid. FIG. 3 is a diagram illustrating the flow of oil when the release valve starts to open in the release valve device shown in FIG. 2. 1 is a longitudinal sectional view showing a release valve device according to a first embodiment of a scroll compressor of the present invention. FIG. 8 is a plan view of the release valve receiver of the release valve device shown in FIG. 7 as viewed from above. FIG. 8 is a bottom view of the release valve receiver of the release valve device shown in FIG. 7 as viewed from below. FIG. 8 is a diagram illustrating the flow of oil when the release valve starts to open in the release valve device shown in FIG. 7. FIG. 4 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 as viewed from above. FIG. 12 is a bottom view of the release valve device shown in FIG. FIG. 12 is a diagram illustrating the flow of oil when the release valve starts to open in the release valve device shown in FIG. 11.

  Hereinafter, specific embodiments of the scroll compressor of the present invention will be described with reference to the drawings. In each of the drawings, the portions denoted by the same reference numerals indicate the same or corresponding portions.

First Embodiment A scroll compressor according to a first embodiment of the present invention will be described with reference to FIGS. 2 to 6 are diagrams for explaining a general release valve device corresponding to the present 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 includes a compression mechanism 2 for forming a compression chamber 2a, an electric motor 3, and the like housed in a closed container 4.

  The compression mechanism section 2 includes a frame 11 fixed to the closed container 4 by welding or the like, a fixed scroll 18 fixed to the frame 11 with bolts and having a scroll wrap, and a revolving scroll having a scroll wrap that meshes with the fixed scroll 2. 19 and 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 transmits the rotating action of the electric motor 9 to the crankshaft 10.

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

  In addition, 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 closed container 4. A suction pipe 6 connected to the suction port 18a is a discharge pipe provided through the closed container 4.

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

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

  Further, reference numeral 21 denotes a release valve device provided in the fixed scroll 21. The release valve device 21 is configured to release the working fluid or the working fluid in the compression chamber 2a when the pressure in the compression chamber 2a is overcompressed. Oil is released to the discharge pressure chamber 20 side. 26 is a holding plate for holding the release valve device 21, and 28 is a fixing bolt for fixing the holding plate 26 to the fixed scroll 18. This release valve device 21 will be described later in detail.

  The oil in the oil sump 17 is supplied to the main bearing 13, the sub-bearing 14, the sliding portions of the fixed scroll 18 and the orbiting scroll 19, etc., to lubricate these sliding portions. Further, by allowing the oil to 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. Accordingly, it is possible to suppress the high-temperature working fluid in the high-pressure side compression chamber from leaking to the low-pressure side, thereby suppressing heating or recompression of the working fluid in the low-pressure side compression chamber, and reducing thermal fluid loss. .

  When the electric motor 3 rotates, the orbiting scroll 19 orbits through the crankshaft 10 to reduce the volume of the compression chamber 2a 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, flows into the compression chamber 2a via the suction port 18a, and compresses the working fluid. Is performed. Thereafter, the compressed working fluid is discharged from the discharge port 18b to the discharge pressure space 20 in the closed casing 4 together with oil, and then flows toward the electric motor chamber 7 to separate the oil. The separated oil flows down into the oil sump 17, and the compressed working fluid (refrigerant) is sent from the closed vessel 4 via the discharge pipe 6 to the condenser side of the refrigeration cycle.

Next, the configuration of the release valve device 21 will be described. The release valve device 21 is for releasing the working fluid from the compression chamber 2a to the discharge pressure space 20 at the time of overcompression in which the pressure in the compression chamber 2a is equal to or higher than the discharge pressure. By allowing the working fluid to escape, overcompression can be prevented, 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 provided at a plurality of locations on the fixed scroll 18 corresponding to the plurality of compression chambers 2a 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 depending on the operating conditions are also sucked into the compression chamber 2a as working fluid. Due to the orbiting movement of the orbiting scroll 19, in the process of compressing the working fluid, the pressure in the compression chamber 2a may be excessively compressed to be equal to or higher than the discharge pressure. The release valve device 21 is closed during an operation state in which overcompression does not occur, but the release valve device 21 is opened during overcompression. Thereby, the compression chamber 2a communicates with the discharge pressure space 20, and the working fluid can be released 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 a release valve receiver of the release valve device shown in FIG. 2 as viewed from above, and FIG. 4 is a view of the release valve device shown in FIG. FIG. 5 is a bottom view of the release valve receiver 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, and also a view showing the flow of the working fluid, and FIG. It is a figure explaining the flow of oil at the time of opening of a release valve in a release valve device.

  As shown in FIG. 2, a release plate 22 communicating with the compression chamber 2a, the release hole 22 and the discharge pressure space 20 are communicated with the base plate portion of the fixed scroll 18, and the release valve device 21 is provided. A release valve chamber 27 for arranging the valve is formed. 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 to have a larger diameter than 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 a re-expansion loss of the gas remaining in the compression stroke. For this reason, the volume of the release hole 22 should be minimized. Further, it is necessary to secure a sufficient release flow path for the release valve chamber 27 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 the diameter of the release hole 22.

  The release valve device 21 includes a release valve 23 that opens and closes the release hole 22 that communicates with the compression chamber 2a. When the release valve 23 is closed, the release valve 23 is moved in a direction to close the flow path of the release hole 22. An elastic body (a 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 a release valve receiver 25 And a holding plate 26 for holding the release valve receiver 25 so that the release valve 23 does not move to the discharge pressure space 20 side.

  The release valve receiver 25 is formed by molding a sintered metal or a carbon steel material or the like, and as shown in FIGS. 3 and 4, a central relief channel 25a provided at the center and an outer peripheral relief provided at the outer peripheral side. A channel 25b is formed. Further, the outer peripheral side discharge channel 25b is formed at three places at equal intervals around the center release channel 25a.

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

  The release valve 23 is attached to a lower end of the elastic body 24, and the release valve 23 is configured to be urged toward the compression chamber 2a 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 at the bottom of the release valve chamber 27. Therefore, when the release valve 23 is closed, the release valve 23 is configured to be urged by the elastic body 24 to abut the valve seat portion to close the release hole 22. The release valve 23 is formed in a disc shape or a circular shape having a different diameter such as an elliptical shape.

When the release valve 23 is opened, a valve receiver for receiving the release valve 23 is provided in the release valve receiver 25.
That is, the above-mentioned release valve receiver 25 is provided with an inner peripheral side release valve receiver 25c at the tip of the above-mentioned convex portion, and an outer peripheral side release valve receiver 25d on the outer peripheral side. As shown in FIG. 4, the outer peripheral side release valve receiving portion 25d is formed at three locations around the inner peripheral side release valve receiving portion 25c at equal intervals. In addition, the outer peripheral side relief flow passage 25b is formed between the outer peripheral side release valve receiving portions 25d provided in the circumferential direction.

  When overcompression occurs in the compression chamber 2a and the pressure acting on the release valve 23 exceeds the urging force of the elastic body 24, the release valve 23 opens and is lifted upward, as shown in FIG. As described above, 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 flows into a release hole as shown by an arrow. After flowing into the release valve chamber 27 through the outer valve 22 and passing through the outer peripheral side of the release valve 23, it passes through the central relief channel 25a and the outer peripheral channel 25b formed in the release valve receiver 25. Then, it is released into the discharge pressure space 20. In this way, a release flow path of the working fluid by the release valve device 21 is formed from the release hole 22 to the release valve chamber 27, further to the central release flow path 25a and the internal release 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 come into contact with the inner peripheral side release valve receiving part 25c and the outer peripheral side release valve receiving part 25d below the receiving part 25.

  When the release passage 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 is caught between the back side of the release valve 23 and the release valve receiving portions 25c and 25d. It has been found that there is a problem in that the opening operation of the scroll valve 23 deteriorates, the response of the release valve device 21 deteriorates, and the performance of the scroll compressor decreases.

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

  Therefore, the scroll compressor according to the first embodiment of the present invention is configured as shown in FIGS. 7 to 10 are views for explaining the release valve device 21 of the first embodiment, FIG. 7 is a longitudinal sectional view showing the release valve device in the first embodiment of the scroll compressor of the present invention, and FIG. 7 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 FIG. 7 as viewed from below, and FIG. It is a figure explaining the flow of oil at the time of opening of a release valve in a valve device.

7 to 10, since the basic parts are the same as those of the release valve device 21 shown in FIGS. 2 to 4 described above, the description will be focused on the parts different from those in FIGS. The description of the parts that have been described is basically omitted.
The release valve device 21 according to the first embodiment is different 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 has a central relief channel 25 a, an outer peripheral relief channel 25 b, and an inner peripheral release similarly to those described with reference to FIGS. 2 to 4. The valve receiving part 25c and the outer peripheral side release valve receiving part 25d are provided. Further, the present embodiment is characterized in that an outer peripheral passage 25e is provided on the outer peripheral side of the outer peripheral side release valve receiving portion 25d.

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

  By providing the outer peripheral flow passage 25 e in the release valve receiver 25, the working fluid or oil flowing into the release valve chamber 27 from the outer peripheral side of the release valve 23 is released as shown by an arrow 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, from which it can flow out to the discharge pressure space 20.

  Accordingly, after the working fluid or oil in the compression chamber 2a flows into the release valve chamber 27, it can be prevented from bending in the circumferential direction, and the back side of the release valve 23 and the release valve receiving portions 25c, 25d can be prevented. The biting of oil into the space can also be suppressed. As a result, it is possible to reduce the pressure loss of the release flow path flowing through the release valve device 21 to the discharge pressure space 20, and it is possible to efficiently discharge the oil to the discharge pressure space 20. In addition, since the operation of the release valve 23 can be prevented from being deteriorated by the bite of the 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.

According to the present embodiment, not only the inner peripheral side release valve receiving portion 25c but also the outer peripheral side release valve receiving portion 25d are provided, so that the area of the release valve receiving portion in the release valve device 21 can be sufficiently secured. There is also an effect.
Other configurations are the same as those in FIGS. 2 to 4 described above, and a description thereof will be omitted.

  Second Embodiment 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 showing the release valve device shown in FIG. 11 from above, and FIG. 13 is a release valve shown in FIG. FIG. 14 is a diagram illustrating the flow of oil when the release valve starts to open in the release valve device shown in FIG.

  The second embodiment differs from the first embodiment in the shape 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. Other configurations are basically the same as those of the first embodiment, and the description of the same portions will be omitted.

  In the first embodiment, a gap is formed between the release valve receiver 25 and the holding plate 26 so that the release valve receiver 25 can move in the vertical direction due to the restriction on the processing accuracy of the fixed scroll 18 and the release valve receiver 25. When the release valve 23 opens, the release valve receiver 25 is also pushed upward simultaneously with the release valve 23, and the release valve receiver 25 collides with the holding plate 26. For this reason, it was found that abrasion occurred on the collision surface between the release valve receiver 25 and the presser plate 26, and there was a problem that the reliability of the release valve receiver 25 and the presser plate 26 was reduced.

  Therefore, in the second embodiment, the holding plate 26 and the release valve receiver 25 in the first embodiment are integrated. That is, as shown in FIGS. 11 to 13, a projecting portion that projects horizontally is provided integrally with the upper end portion (end portion on the discharge pressure space 20 side) of the release valve receiver 25, and this projecting portion is attached to the fixed scroll 18. Is fixed to the base plate with fixing bolts 28. Thereby, 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.

  The central relief channel 25a, the outer peripheral channel 25b, and the outer peripheral channel 25e provided on the outer peripheral side of the outer peripheral release valve receiving portion 25c formed in the release valve receiver 25 are connected to the release valve receiver 25. Is formed so as to penetrate to the upper end portion (end portion on the side of the discharge pressure space 20), and is opened to the discharge pressure space 20.

  With this configuration, the same effects as those of the first embodiment can be obtained, and since the collision between the release valve receiver 25 and the holding plate 26 does not occur as in the case of the first embodiment, there is a possibility of abrasion. Release valve device 21 can be realized, and high reliability can be obtained.

Further, since the holding 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 holding plate 26 as in the first embodiment. As shown in FIG. 11, the release valve chamber 27 can be formed so as to be enlarged to the inner peripheral surface thereof. As a result, the flow path 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 in the first embodiment.

  Each of the scroll compressors according to the embodiments of the present invention described above is particularly suitable for a refrigeration cycle device using a refrigerant containing 70% by weight or more of R32 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 device such as an air conditioner, the adiabatic index is larger and the discharge gas temperature is higher than when a refrigerant containing less than 70% by weight of R32 is used. Will be higher. For this reason, since it is necessary to suppress the temperature of the scroll compressor, for example, the refrigerant sucked into the compressor often operates under the liquid return condition (wet state). As a result, a state of liquid compression is easily generated in the compression chamber, and over-compression is easily generated.

  By using a scroll compressor as shown in the above-described first or second embodiment in such a refrigeration cycle apparatus, 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 this occurs, the release valve device 21 operates with good responsiveness, so that the load on the scroll wrap can be suppressed, and the reliability of the scroll compressor can be increased. That is, since the working fluid including the oil passing through the inside of the release valve device 21 is easily discharged to the discharge pressure space 20, even if the overcompression due to the liquid compression occurs, the release valve 23 is released from the back of the release valve 23. Since the engagement of the oil between the valve receiving portions 25c and 25d can be suppressed, 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.

  Note that the present invention is not limited to the above-described embodiments, and includes various modifications. Further, 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 above.

DESCRIPTION OF SYMBOLS 1 ... Scroll compressor, 2 ... Compression mechanism part, 2a ... Compression chamber,
3 ... motor, 3a ... rotor, 3b ... stator,
4 closed container, 5 suction pipe, 6 discharge pipe,
7 ... motor room, 8 ... oil pump, 9 ... oil drain pipe,
10 ... crankshaft, 10a ... main shaft part, 10b ... sub shaft part, 10c ... eccentric pin part,
11 ... frame, 12 ... sub-frame,
13 ... Main bearing, 14 ... Sub bearing, 15 ... Sub bearing housing,
16 ... power supply terminal, 17 ... oil pool,
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
25a: central escape passage, 25b: outer peripheral escape passage,
25c ... inner peripheral side release valve receiving part, 25d ... outer peripheral side release valve receiving part,
25e: outer peripheral flow path, 26: holding plate,
27: release valve chamber, 28: fixing bolt.

Claims (7)

A fixed scroll having a base plate and a scroll wrap and a revolving scroll are meshed with each other to form a compression chamber, a sealed container accommodating the compression mechanism, and formed in the sealed container. A scroll compressor having a discharge pressure space into which the 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 the release hole with the discharge pressure space,
A release valve device that is provided in the release valve chamber and that allows a working fluid to flow from the compression chamber to the discharge pressure space by communicating the compression chamber with the discharge pressure space;
The release valve device includes a release valve for opening and closing the release hole, and a release valve receiver for receiving 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 an outer peripheral side with respect to the outer peripheral release valve receiver. An outer peripheral flow path is provided ,
The release valve receiver communicates the release valve chamber and the discharge pressure space, and includes a central relief flow path provided on a central side, and an outer peripheral side release flow path provided on an outer peripheral side,
The outer peripheral side release flow path is provided in a plurality in the circumferential direction, the outer peripheral side release valve receiving portion and the outer peripheral flow path are provided between the plurality of outer peripheral side release flow paths,
A scroll compressor, wherein a plurality of the outer peripheral side release valve receiving portions are provided in a circumferential direction, and the outer peripheral flow path is provided on an outer peripheral side of the plurality of outer peripheral side release valve receiving portions .   2. The scroll compressor according to claim 1, wherein the base plate of the fixed scroll is provided with a holding plate for holding the release valve receiver from moving toward the discharge pressure space. 3. Machine.   2. The scroll compressor according to claim 1, wherein the release valve receiver is provided with an overhang portion integrally at an end on the discharge pressure space side, and the overhang portion is fixed to a base plate of the fixed scroll. 3. A scroll compressor, characterized in that it is configured to hold a release valve receiver from moving toward the discharge pressure space. 4. The scroll compressor according to claim 3 , wherein the outer peripheral passage provided on an outer peripheral side of the outer peripheral side release valve receiver is provided to penetrate to a discharge pressure space side end of the release valve receiver, A scroll compressor formed so as to open to a discharge pressure space. The scroll compressor according to claim 4 , wherein the outer peripheral flow path is formed up to an inner peripheral surface of a release valve chamber. 5. The scroll compressor according to claim 4 , wherein the release valve receiver includes a central relief channel provided on a central side and an outer peripheral channel provided on an outer peripheral side, wherein the central relief channel and the outer periphery are provided. 6. A scroll compressor, wherein a side relief passage is also provided so as to penetrate to a discharge pressure space side end of the release valve receiver, and is formed to 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% by weight or more of the refrigerant R32.

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