JP2020159232A - Scroll compressor - Google Patents

Abstract

To suppress deterioration in performance caused by a fluid being excessively compressed, even in the case where a discharge part is integrally formed at a housing for reducing size and weight, in a scroll compressor capable of controlling capacity.SOLUTION: A scroll compressor 1 includes: a rear housing 2 in which a discharge part 2A for guiding a fluid discharged from a discharge port to a discharge pipe, a bypass chamber 40 for storing the fluid to be guided to the bypass pipe from a bypass port, and a communication flow passage 50 for guiding the fluid to the discharge part 2A from the bypass chamber 40 are formed; and a communication mechanism 60 for guiding the fluid to the discharge part 2A from the bypass chamber 40 via the communication flow passage 50. The communication mechanism 60 includes: a cylindrical member 61 which is arranged along an inner peripheral surface 2Aa of the discharge part 2A, and in which a through-hole 61a is formed for guiding the fluid guided from the communication flow passage 50 to the inside; and a reed valve 62 mounted on an inner peripheral surface 61b of the cylindrical member 61 so as to close the through-hole 61a.SELECTED DRAWING: Figure 5

Description

The present invention relates to a scroll compressor.

Conventionally, there is known a scroll compressor that compresses a fluid by forming a compression chamber by engaging a fixed scroll and a swivel scroll and revolving the swivel scroll with respect to the fixed scroll (for example, Patent Document 1). reference). The scroll compressor disclosed in Patent Document 1 performs capacity control according to an operating ability by taking out a fluid in the middle of compression from a bypass port provided outside the discharge port for discharging the fluid from the compression chamber. Can be done.

Further, in Patent Document 1, a discharge chamber communicating with the discharge pipe is provided, and a check valve is provided at the discharge port communicating the intermediate chamber and the discharge chamber. As a result, when the pressure of the fluid in the intermediate chamber exceeds the pressure of the fluid discharged from the discharge port, the fluid can be guided from the intermediate chamber to the discharge chamber, and performance deterioration due to excessive compression of the fluid can be suppressed. it can.

JP-A-2018-105194

In Patent Document 1, an end portion provided with a discharge pipe is further attached on a cover of a housing (casing) accommodating a scroll compression mechanism (scroll compressor main body), and a space partitioned by the cover and the end portion is defined as a discharge chamber. It was done.
However, in the case of integrally forming a discharge portion for guiding the compressed fluid to the discharge pipe in the housing accommodating the scroll compression mechanism to reduce the size and weight, other members are attached to form a discharge chamber. Can not do it. Therefore, it was not possible to suppress the deterioration of performance due to excessive compression of the fluid.

The present invention has been made in view of such circumstances, and a discharge portion for guiding a compressed fluid to a discharge pipe is integrally formed in a housing accommodating a scroll compression mechanism to reduce the size and weight. It is an object of the present invention to provide a scroll compressor capable of suppressing performance deterioration due to excessive compression of a fluid even in the case of conversion.

In order to solve the above-mentioned problems, the scroll compressor according to one aspect of the present invention employs the following means.
The scroll compressor according to one aspect of the present invention includes a housing formed in a tubular shape along an axis, a fixed scroll housed in the housing, and a crank pin eccentric with respect to a drive shaft rotating around the axis. The fixed scroll and the swivel scroll are intermeshed with each other, and the fluid sucked from the suction portion is transferred from the outer peripheral side to the inner peripheral side by the swivel scroll which is connected to and revolves around the axis. A compression chamber for guiding and compressing is formed, and the fixed scroll is provided with a discharge port that guides the fluid compressed in the compression chamber to a discharge pipe attached to the housing, and is arranged on the outer peripheral side of the discharge port. A bypass port is formed to guide the fluid to the bypass pipe communicating with the suction portion, and the housing is formed with a cylindrical inner peripheral surface while guiding the fluid discharged from the discharge port to the discharge pipe. A discharge portion, a bypass portion for accommodating the fluid guided from the bypass port to the bypass pipe, and a communication flow path for guiding the fluid from the bypass portion to the discharge portion are formed and attached to the discharge portion. Further, when the pressure of the fluid accommodated in the bypass portion is higher than the pressure of the fluid flowing through the discharge portion, a communication mechanism for guiding the fluid from the bypass portion to the discharge portion via the communication flow path is further provided. The communication mechanism is arranged along the inner peripheral surface of the discharge portion and closes the through hole and a cylindrical member having a through hole for guiding the fluid guided from the communication flow path to the inside. Has a lead valve attached to the inner peripheral surface of the cylindrical member.

According to the scroll compressor according to one aspect of the present invention, the housing is formed with a discharge portion, a bypass portion, and a communication flow path, and is arranged on the outer peripheral side of the discharge port via the bypass portion. The fluid flowing in from the bypass port can be guided to the communication flow path. The inner peripheral surface of the discharge portion is formed in a cylindrical shape, and a cylindrical member of a communication mechanism is arranged along the inner peripheral surface. The cylindrical member is formed with a through hole for guiding the fluid guided from the communication flow path to the inside, and a lead valve is attached so as to close the through hole.

Therefore, when the pressure of the fluid guided to the communication flow path is higher than the pressure of the fluid flowing through the discharge portion, the lead valve is opened and the fluid flows from the communication flow path to the discharge portion through the through hole. Be guided. As described above, according to the scroll compressor according to one aspect of the present invention, a discharge portion for guiding the compressed fluid to the discharge pipe is integrally formed in the housing accommodating the scroll compression mechanism to reduce the size and weight. Even in this case, by attaching a communication mechanism to the discharge portion, it is possible to suppress performance deterioration due to excessive compression of the fluid.

In the scroll compressor according to one aspect of the present invention, the cylindrical member is a pair of O-rings that come into contact with the inner peripheral surface of the discharge portion so as to sandwich the through hole along the direction in which the cylindrical member extends. May have. By forming an annular seal region at a position where the through hole is sandwiched between the pair of O-rings, it is possible to prevent the discharge portion and the communication flow path from communicating with each other in a region other than the lead valve.

In the scroll compressor according to one aspect of the present invention, a circle formed on the inner peripheral surface of the discharge portion on the discharge pipe side of the end surface of the cylindrical member with the cylindrical member inserted. An annular groove portion is formed, and the cylindrical member may be fixed by an annular fixture inserted into the annular groove portion. A cylindrical member to which a lead valve is attached is inserted along the inner peripheral surface of the discharge portion, and then an annular fixture is inserted into the annular groove portion, which is a relatively simple operation to insert the cylindrical member into the discharge portion. On the other hand, it can be securely fixed.

In the scroll compressor according to one aspect of the present invention, an annular recess that communicates with the through hole is formed on the outer peripheral surface of the cylindrical member, and the cylindrical member has the communication flow path and the circle. It may be arranged at a position where it communicates with the annular recess. According to the scroll compressor of this configuration, since the annular recess is formed on the outer peripheral surface of the cylindrical member, the annular recess is inserted regardless of the position around the axis of the cylindrical member inserted into the discharge portion. The state in which the communication flow path and the through hole communicate with each other is maintained. Since the position around the axis of the cylindrical member can be set to an arbitrary position, the work of attaching the cylindrical member to the discharge portion becomes easy.

In the scroll compressor according to one aspect of the present invention, the lead valve may be attached to the inner peripheral surface of the cylindrical member so that the direction in which the cylindrical member extends is the longitudinal direction. By matching the longitudinal direction of the reed valve with the direction in which the cylindrical member extends, the total length of the reed valve can be lengthened, the responsiveness of valve opening / closing can be improved, and the pressure loss due to the opening / closing delay can be reduced.

In the scroll compressor according to one aspect of the present invention, the cylindrical member is formed so as to extend along the cylindrical axis, and the position of the through hole in the circumferential direction around the cylindrical axis coincides with the communication flow path. It may be arranged so as to. Since the through hole and the communication flow path are aligned in the circumferential direction around the cylindrical axis, the communication flow path and the through hole are arranged so as to extend in the same direction. Therefore, the pressure loss generated in the fluid flowing from the communication flow path into the through hole can be reduced as compared with the case where the through hole and the communication flow path do not match the positions in the circumferential direction around the cylindrical axis.

According to the present invention, even when the housing accommodating the scroll compression mechanism is integrally formed with a discharge portion for guiding the compressed fluid to the discharge pipe to reduce the size and weight, the fluid is excessively compressed. It is possible to provide a scroll compressor capable of suppressing performance deterioration due to this.

It is a vertical sectional view which shows the scroll compressor of 1st Embodiment of this invention. It is a partially enlarged view of the scroll compressor shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA of the scroll compressor shown in FIG. It is a figure which showed the state which removed the rear housing, the connecting member, and the bypass pipe from the scroll compressor shown in FIG. It is a partially enlarged view of the communication mechanism of the scroll compressor shown in FIG. FIG. 5 is a cross-sectional view taken along the line BB of the communication mechanism shown in FIG. FIG. 5 is a cross-sectional view taken along the line CC of the communication mechanism shown in FIG. It is a partially enlarged view of the communication mechanism of the scroll compressor of the 2nd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along the line DD of the communication mechanism shown in FIG. FIG. 8 is a cross-sectional view taken along the line EE of the communication mechanism shown in FIG.

[First Embodiment]
Hereinafter, the open scroll compressor 1 according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing the scroll compressor 1 of the present embodiment.

As shown in FIG. 1, the scroll compressor 1 of the present embodiment has a rear housing 2 formed in a cylindrical shape extending in the circumferential direction around the axis X, and an opening provided on the front end side of the rear housing 2. It includes a front housing 3 attached so as to block 2a, and a front cover 11 attached to the other end of the front housing 3.

Further, the scroll compressor 1 of the present embodiment includes a scroll compression mechanism 5, a drive shaft 6, a main bearing (bearing portion) 7, a sub bearing 8, a crank pin 13, a drive bush 14, and a fixed scroll 15. And a swivel scroll 16.

The rear housing 2 has a shape in which the rear end side is closed, and the front housing 3 is fixed to the opening 2a on the front end side by a bolt 9. A closed space is formed inside the rear housing 2 with the front housing 3 fixed to the rear housing 2, and the scroll compression mechanism 5 and the drive shaft 6 are housed in the closed space. On the outer peripheral surface of the rear housing 2, a suction portion (not shown) for flowing a fluid (refrigerant gas) into the closed space and a discharge portion 2A for discharging the fluid compressed by the scroll compression mechanism 5 from the closed space to the outside are provided. It is formed.

The drive shaft 6 is rotatably supported by the front housing 3 via a main bearing 7 and a sub bearing 8. A pulley 18 rotatably installed on the outer peripheral portion of the front cover 11 is connected to the front end of the drive shaft 6 via an electromagnetic clutch 19. Power from the outside that drives the pulley 18 is transmitted to the drive shaft 6 via the electromagnetic clutch 19, and the drive shaft 6 rotates around the axis X shown in FIG. A crankpin 13 eccentric by a predetermined dimension is integrally provided at the rear end of the drive shaft 6. Further, the rear end of the drive shaft 6 is connected via a known variable turning radius mechanism including a turning scroll 16 of a scroll compression mechanism 5 described later and a drive bush 14 having a variable turning radius thereof.

In the scroll compression mechanism 5, the fluid (refrigerant gas) that is driven by the drive shaft 6 that rotates around the axis X and that flows in from the suction portion formed on the outer peripheral surface of the rear housing 2 is compressed and formed in the rear housing 2. Discharge from the discharge unit 2A.

The scroll compression mechanism 5 is a mechanism in which the fixed scroll 15 and the swivel scroll 16 are engaged with each other with a phase shift of 180 degrees, and the swivel scroll 16 revolves and swivels around the axis X. The scroll compression mechanism 5 forms a pair of compression chambers 17 between the fixed scroll 15 and the swivel scroll 16 and moves the fluid (refrigerant gas) by gradually reducing the volume from the outer peripheral position to the central position. Compress. The compression chamber 17 is a space that guides the fluid sucked from the suction portion from the outer peripheral side to the inner peripheral side and compresses it.

The fixed scroll 15 is fixed to the front housing 3 via the bearing member 7a. Further, the swivel scroll 16 is connected to the crank pin 13 of the drive shaft 6 via a drive bush 14, and is supported so as to be revolving and swivel drive around the axis X. The crank pin 13 is arranged at a position eccentric with respect to the axis X of the drive shaft 6.

The fixed scroll 15 and the swivel scroll 16 have a configuration in which spiral wraps 15B and 16B are erected on the end plates 15A and 16A, respectively. A pair of compression chambers 17 partitioned by the end plates 15A and 16A and the spiral wraps 15B and 16B are formed symmetrically with respect to the scroll center between the fixed scroll 15 and the swivel scroll 16. Further, the swivel scroll 16 smoothly revolves and swivels around the fixed scroll 15.

As shown in FIG. 1, the height of the compression chamber 17 in the axial direction is higher on the outer peripheral side of the spiral wraps 15B and 16B than on the inner peripheral side. As a result, when the compression chamber 17 moves from the outer peripheral side to the central side while reducing the volume to compress the fluid, three-dimensional compression is possible in which the spiral wraps 15B and 16B are compressed in both the circumferential direction and the lap height direction. A scroll compression mechanism 5 is configured.

Next, the discharge port 15a, the bypass port 15b, and the overcompression prevention port 15c formed on the fixed scroll 15 will be described with reference to FIG. FIG. 2 is a partially enlarged view of the scroll compressor 1 shown in FIG. 1, and is a vertical cross-sectional view showing a discharge port 15a, a bypass port 15b, and an overcompression prevention port 15c.

As shown in FIG. 2, the end plate 15A of the fixed scroll 15 is formed with a discharge port 15a, a bypass port 15b, and an overcompression prevention port 15c. The discharge port 15a, the bypass port 15b, and the overcompression prevention port 15c are through holes through which the end plate 15A is penetrated in the direction along the axis X.

The discharge port 15a is a port that is arranged substantially in the center of the end plate 15A and guides the fluid compressed in the compression chamber 17 to a discharge pipe (not shown) attached to the discharge portion 2A of the rear housing 2. On the end plate 15A, a lead valve 21 composed of a plate-shaped valve plate and a holding plate is arranged at a position of closing the discharge port 15a. The lead valve 21 is opened when the pressure of the discharge port 15a becomes higher than the pressure of the internal space of the discharge portion 2A.

The bypass port 15b is a port arranged on the outer peripheral side of the discharge port 15a with respect to the center of the end plate 15A. The bypass port 15b guides the fluid compressed in the compression chamber 17 to the bypass pipe 30 (see FIG. 3) that communicates with the suction portion. On the end plate 15A, a lead valve 22 composed of a plate-shaped valve plate and a holding plate is arranged at a position of closing the bypass port 15b. The reed valve 22 is opened when the pressure of the bypass port 15b becomes higher than the pressure of the bypass chamber 40.

As shown by a virtual line in FIG. 3, the bypass chamber (bypass portion) 40 is a space formed in an annular shape around the axis X of the rear housing 2. The bypass chamber 40 pushes the lead valve 22 away from the bypass port 15b and flows in to accommodate the fluid guided to the bypass pipe 30.

As shown in FIGS. 2 and 3, the rear housing 2 is formed with a discharge portion 2A, a bypass chamber 40, and a communication flow path 50. The discharge portion 2A is a space in which the inner peripheral surface 2Aa along the axis Y orthogonal to the axis X is formed in a cylindrical shape, and guides the fluid discharged from the discharge port 15a to the discharge pipe connected to the end portion. The discharge portion 2A is formed in the connecting member 10 and communicates with the discharge port 15a via the space 10A in which the lead valve 21 and the lead valve 23 are arranged. The communication flow path 50 is a flow path that guides the fluid from the bypass chamber 40 to the discharge portion 2A.

The bypass chamber 40 communicates with the bypass pipe 30. The bypass pipe 30 is provided with an electromagnetic on-off valve 31 that opens and closes in response to a control signal from a control unit (not shown). During the capacity control operation to reduce the discharge flow rate of the scroll compressor 1, the control unit opens the electromagnetic on-off valve 31, and the fluid is guided from the bypass chamber 40 to the suction unit (not shown) via the bypass pipe 30 and discharged. The flow rate discharged from the part 2A can be reduced. On the other hand, in the normal operation in which the capacitance control is off, the control unit closes the electromagnetic on-off valve 31 and the fluid is not guided from the bypass chamber 40 to the suction unit.

The overcompression prevention port 15c is a port arranged on the outer peripheral side of the discharge port 15a with respect to the center of the end plate 15A and on the inner peripheral side of the bypass port 15b. The overcompression prevention port 15c is a port that guides the fluid compressed in the compression chamber 17 to a discharge pipe (not shown) attached to the discharge portion 2A of the rear housing 2. On the end plate 15A, a lead valve 23 composed of a plate-shaped valve plate and a holding plate is arranged at a position that closes the overcompression prevention port 15c. The reed valve 23 is opened when the pressure of the overcompression prevention port 15c becomes higher than the pressure of the internal space of the discharge portion 2A.

FIG. 4 is a diagram showing a state in which the rear housing 2, the connecting member 10, and the bypass pipe 30 are removed from the scroll compressor 1 shown in FIG. As shown in FIG. 4, the discharge port 15a is arranged substantially at the center of the end plate 15A. The bypass ports 15b are arranged on the outer peripheral side of the discharge port 15a with respect to the center of the end plate 15A, and are arranged at four locations with respect to one lead valve 22. The overcompression prevention port 15c is arranged on the outer peripheral side of the discharge port 15a with respect to the center of the end plate 15A and on the inner peripheral side of the bypass port 15b. Two overcompression prevention ports 15c are arranged for each of the two lead valves 23.

Next, during normal operation in which the capacitance control is off and the control unit closes the electromagnetic on-off valve 31, the communication mechanism 60 that guides the fluid from the bypass chamber 40 to the discharge unit 2A will be described with reference to FIGS. 5 to 7. To do. The communication mechanism 60 is attached to the discharge unit 2A, and when the pressure of the fluid contained in the bypass chamber 40 is higher than the pressure of the fluid flowing through the discharge unit 2A, the communication mechanism 60 is discharged from the bypass chamber 40 via the communication flow path 50. It is a mechanism that guides the fluid to 2A. As shown in FIG. 5, the communication mechanism 60 includes a cylindrical member 61 and a lead valve 62.

The cylindrical member 61 is a substantially cylindrical member extending along the axis Y. As shown in FIG. 6, the cylindrical member 61 is arranged along the communication mechanism 60 on the inner peripheral surface 2Aa of the discharge portion 2A, and the through hole 61a for guiding the fluid guided from the communication flow path 50 to the inside (see FIG. 7). Is formed. As shown in FIG. 5, the cylindrical member 61 has a pair of O-rings 61c that come into contact with the inner peripheral surface 2Aa so as to sandwich the through hole 61a along the axis Y direction. The O-ring 61c forms an annular sealing region by contacting the inner peripheral surface 2Aa over the entire circumference around the axis Y.

On the inner peripheral surface 2Aa of the discharge portion 2A, a step portion 2Ac extending all around the axis Y is formed on the side farther from the discharge pipe than the position where the through hole 61a is formed. The diameter of the inner peripheral surface 2Aa on the side farther from the discharge pipe than the step portion 2Ac is smaller than the diameter of the outer peripheral surface of the cylindrical member 61. Therefore, the cylindrical member 61 is positioned at a position where the tip of the cylindrical member 61 abuts on the step portion 2Ac.

An annular groove 2Ab formed on the inner peripheral surface 2Aa of the discharge portion 2A is formed on the discharge pipe side of the end surface 61f of the cylindrical member 61 with the cylindrical member 61 inserted. A snap ring (annular fixture) 63 having a substantially C-shaped plan view is attached to the annular groove portion 2Ab.

The operator elastically deforms the snap ring 63 and inserts it to the position of the annular groove portion 2Ab to release the elastic deformation. As a result, the snap ring 63 is inserted into the annular groove portion 2Ab. The cylindrical member 61 is fixed by a snap ring 63 inserted into the annular groove portion 2Ab so as not to come off to the discharge pipe side.

As shown in FIGS. 5 and 7, an annular recess 61e communicating with the through hole 61a is formed on the outer peripheral surface 61d of the cylindrical member 61. As shown in FIG. 7, the annular recess 61e is an annular groove formed over the entire circumference around the axis Y. The annular recess 61e forms an endless annular flow path extending in the circumferential direction around the axis Y together with the inner peripheral surface 2Aa of the discharge portion 2A. As shown in FIG. 5, the cylindrical member 61 is arranged at a position where the communication flow path 50 and the annular recess 61e communicate with each other. Therefore, the communication flow path 50 and the through hole 61a are in a state of being communicated with each other through the annular recess 61e.

The lead valve 62 is a valve body attached to the inner peripheral surface 61b of the cylindrical member 61 so as to close the through hole 61a. The lead valve 62 is a fastening bolt that fastens a valve plate 62a, which is a plate-shaped elastic member, a holding plate 62b that suppresses deformation of the valve plate 62a to a desired amount, and the valve plate 62a and the holding plate 62b to the cylindrical member 61. It has 62c and. As shown in FIG. 5, the lead valve 62 is attached to the inner peripheral surface 61b of the cylindrical member 61 so that the direction in which the cylindrical member 61 extends (the axis Y direction) is the longitudinal direction.

As shown in FIG. 6, the cylindrical member 61 is formed with a tool insertion hole 61g for inserting a fastening bolt 62c and a tool (not shown) for tightening the fastening bolt 62c. Before attaching the communication mechanism 60 to the discharge portion 2A, the operator attaches the lead valve 62 to the cylindrical member 61 by inserting a tool through the tool insertion hole 61g and rotating the fastening bolt 62c.

As described above, the communication flow path 50 and the through hole 61a are in a state of communicating with each other through the annular recess 61e. Therefore, when the pressure of the bypass chamber 40 is higher than the pressure of the discharge portion 2A, the valve plate 62a that closes the through hole 61a is deformed and separated from the through hole 61a, and the fluid is guided from the through hole 61a to the discharge portion 2A.

The actions and effects of the scroll compressor 1 of the present embodiment described above will be described.
According to the scroll compressor 1 of the present embodiment, the rear housing 2 is formed with a discharge portion 2A, a bypass chamber 40, and a communication flow path 50, and is formed from the discharge port 15a via the bypass chamber 40. The fluid flowing in from the bypass port 15b arranged on the outer peripheral side can be guided to the communication flow path 50. The discharge portion 2A has an inner peripheral surface 2Aa formed in a cylindrical shape, and a cylindrical member 61 of a communication mechanism 60 is arranged along the inner peripheral surface 2Aa. The cylindrical member 61 is formed with a through hole 61a for guiding the fluid guided from the communication flow path 50 to the inside, and a lead valve 62 is attached so as to close the through hole 61a.

Therefore, when the pressure of the fluid guided to the communication flow path 50 is higher than the pressure of the fluid flowing through the discharge portion 2A, the lead valve 62 is opened and the communication flow path 50 is passed through the through hole 61a. The fluid is guided to the discharge portion 2A. As described above, according to the scroll compressor 1 of the present embodiment, the discharge portion 2A for guiding the compressed fluid to the discharge pipe is integrally formed in the rear housing 2 accommodating the scroll compression mechanism 5 to reduce the size and weight. By attaching the communication mechanism 60 to the discharge portion 2A, it is possible to suppress performance deterioration due to excessive compression of the fluid.

Further, by forming an annular seal region at a position where the through hole 61a is sandwiched between the pair of O-rings 61c, it is possible to prevent the discharge portion 2A and the communication flow path 50 from communicating with each other in regions other than the lead valve 62. be able to.
Further, a cylindrical member 61 to which the lead valve 62 is attached is inserted along the inner peripheral surface 2Aa of the discharge portion 2A, and then the snap ring 63 is inserted into the annular groove portion 2Ab. The shape member 61 can be securely fixed to the discharge portion 2A.

Further, according to the scroll compressor 1 of the present embodiment, since the annular recess 61e is formed on the outer peripheral surface 61d of the cylindrical member 61, the position of the cylindrical member 61 inserted into the discharge portion 2A around the axis Y. Regardless of this, the state in which the communication flow path 50 and the through hole 61a communicate with each other through the annular recess 61e is maintained. Since the position of the cylindrical member 61 around the axis Y can be set to an arbitrary position, the work of attaching the cylindrical member 61 to the discharge portion 2A becomes easy.

[Second Embodiment]
Next, the scroll compressor 1A according to the second embodiment of the present invention will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is the same as the first embodiment except for the cases described below, and the description thereof will be omitted below.

In the scroll compressor 1 of the first embodiment, the communication flow path 50 and the through hole 61a can be communicated with each other by forming an annular recess 61e on the outer peripheral surface 61d of the cylindrical member 61 of the communication mechanism 60. is there. On the other hand, the scroll compressor 1A of the present embodiment is provided with only the through hole 61h on the outer peripheral surface 61d of the cylindrical member 61A of the communication mechanism 60A.

Hereinafter, in the normal operation in which the capacitance control is off, the communication mechanism 60A for guiding the fluid from the bypass chamber 40 to the discharge unit 2A in the normal operation in which the control unit is in the closed state of the electromagnetic on-off valve 31 is shown in FIGS. 8 to 10. It will be explained with reference to. The communication mechanism 60A of the present embodiment is different in that the through hole 61h is provided instead of the through hole 61a and the annular recess 61e provided in the communication mechanism 60 of the first embodiment. The other configuration of the communication mechanism 60A is the same as that of the communication mechanism 60 of the first embodiment.

As shown in FIG. 8, the cylindrical member 61A of the communication mechanism 60A is formed with a through hole 61h for communicating the outer peripheral surface 61d and the inner peripheral surface 61b of the cylindrical member 61A. The through hole 61h is a hole having a circular plan view formed only at one place around the axis Y of the cylindrical member 61A. As shown in FIG. 8, the cylindrical member 61A is attached to the discharge portion 2A so that the position of the through hole 61h in the circumferential direction around the axis Y coincides with the position of the communication flow path 50.

As shown in FIGS. 9 and 10, the lead valve 62 is attached at the same position as the through hole 61h in the circumferential direction around the axis Y. This is because the through hole 61h is closed by the valve plate 62a of the lead valve 62.

In the present embodiment, since the through hole 61h and the communication flow path 50 are aligned in the circumferential direction around the axis Y, the communication flow path 50 and the through hole 61h are arranged so as to extend in the same direction. Therefore, as compared with the first embodiment, the pressure loss generated in the fluid flowing from the communication flow path 50 into the through hole 61h can be reduced.

1,1A Scroll compressor 2 Rear housing 2A Discharge part 2Aa Inner peripheral surface 2Ab Circular groove 2Ac Step part 5 Scroll compression mechanism 6 Drive shaft 11 Front cover 13 Crankpin 15 Fixed scroll 15a Discharge port 15b Bypass port 15c Overcompression prevention port 16 Swing scroll 17 Compression chamber 21, 22, 23 Reed valve 30 Bypass piping 40 Bypass chamber (bypass section)
50 Communication flow path 60, 60A Communication mechanism 61, 61A Cylindrical member 61a Through hole 61b Inner peripheral surface 61c O-ring 61d Outer peripheral surface 61e Circular recess 61f End surface 61g Tool insertion hole 61h Through hole 62 Lead valve 62a Valve plate 63 Snap ring X, Y axis

Claims (6)

A housing formed in a tubular shape along the axis,
A fixed scroll housed in the housing
It is provided with a swivel scroll that is connected to a crankpin that is eccentric with respect to a drive shaft that rotates around the axis and that revolves around the axis.
The fixed scroll and the swivel scroll are meshed with each other to form a compression chamber that guides and compresses the fluid sucked from the suction portion from the outer peripheral side to the inner peripheral side.
The fixed scroll has a discharge port that guides the fluid compressed in the compression chamber to a discharge pipe attached to the housing, and a bypass pipe that is arranged on the outer peripheral side of the discharge port and communicates the fluid to the suction portion. A bypass port leading to is formed,
The housing includes a discharge portion that guides the fluid discharged from the discharge port to the discharge pipe and has a cylindrical inner peripheral surface, and a bypass portion that houses the fluid that is guided from the bypass port to the bypass pipe. And a communication flow path that guides the fluid from the bypass portion to the discharge portion is formed.
When the pressure of the fluid attached to the discharge portion and accommodated in the bypass portion is higher than the pressure of the fluid flowing through the discharge portion, the fluid is guided from the bypass portion to the discharge portion via the communication flow path. Further equipped with a communication mechanism,
The communication mechanism
A cylindrical member arranged along the inner peripheral surface of the discharge portion and having a through hole for guiding a fluid guided from the communication flow path to the inside.
A scroll compressor having a lead valve attached to the inner peripheral surface of the cylindrical member so as to close the through hole. The scroll compressor according to claim 1, wherein the cylindrical member has a pair of O-rings that come into contact with the inner peripheral surface of the discharge portion so as to sandwich the through hole along the direction in which the cylindrical member extends. An annular groove portion formed on the discharge pipe side of the end surface of the cylindrical member with the cylindrical member inserted is formed on the inner peripheral surface of the discharge portion.
The scroll compressor according to claim 1 or 2, wherein the cylindrical member is fixed by an annular fixture inserted into the annular groove portion. An annular recess that communicates with the through hole is formed on the outer peripheral surface of the cylindrical member.
The scroll compressor according to any one of claims 1 to 3, wherein the cylindrical member is arranged at a position where the communication flow path and the annular recess are communicated with each other. The scroll compressor according to any one of claims 1 to 4, wherein the lead valve is attached to the inner peripheral surface of the cylindrical member so that the direction in which the cylindrical member extends is the longitudinal direction. According to claim 1, the cylindrical member is formed so as to extend along the cylindrical axis and is arranged so that the position of the through hole in the circumferential direction around the cylindrical axis coincides with the communication flow path. Item 3. The scroll compressor according to any one of items 3.

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