WO2019138553A1

WO2019138553A1 - Scroll compressor

Info

Publication number: WO2019138553A1
Application number: PCT/JP2018/000715
Authority: WO
Inventors: 太樹飯塚; 遼太飯島
Original assignee: 日立ジョンソンコントロールズ空調株式会社
Priority date: 2018-01-12
Filing date: 2018-01-12
Publication date: 2019-07-18
Also published as: JPWO2019138553A1; JP6570756B1

Abstract

In a scroll compressor (1) according to the present invention, a compression chamber (RC) is formed between a fixed scroll (40) and an orbiting scroll (30) due to meshing of an orbiting lap (32) and a fixed lap (42). The scroll compressor (1) is provided with a capacity control valve (62) for opening or closing a bypass path (71) providing communication between the compression chamber (RC) and a suction opening (44) serving as a refrigerant supply portion for supplying an external gas refrigerant to the compression chamber (RC). The capacity control valve (62) is provided with a valve body (62a) which has a valve body hole (62ac) providing communication between a rear end-side opening portion (62e) opening on a rear-end surface and a front end-side opening portion (62f) opening on a front end-side lateral surface. The valve body (62a), when positioned in a valve-closed position, has the front end-side opening portion (62f) closed to block the bypass path (71), and, when positioned in a valve-open position, has the front end-side opening portion (62f) opened to open the bypass path (71).

Description

Scroll compressor

The present invention relates to a scroll compressor that constitutes a refrigeration cycle apparatus such as an air conditioner.

DESCRIPTION OF RELATED ART A scroll compressor is known as a compressor which comprises refrigerating-cycle apparatuses, such as an air conditioner. And in a scroll compressor, in order to control a fall of compression performance at the time of low load operation, capacity control of a compression room is performed.
For example, in patent document 1, while providing the bypass channel (communication channel) which leads from the extension chamber side of a compression chamber to the outer chamber side, the bypass valve (piston) which opens and closes a bypass channel is provided.
Then, at the time of low load operation, the bypass valve is opened and the refrigerant in the compression chamber is discharged from the extension chamber side to the outer chamber side through the bypass passage, thereby reducing the substantial compression chamber capacity (low capacity operation) .
Further, during high load operation, the scroll compressor is operated with the bypass valve closed (high capacity operation).

JP, 2007-154761, A

However, in Patent Document 1, when the turning wrap of the turning scroll (movable scroll) is shifted to one side in the bypass port section, the extension side compression chamber and the outside line side compression chamber do not communicate even if the bypass valve is opened. It has become.
For this reason, there is a problem that over-compression is performed temporarily and a pressure loss occurs.

This invention is made in view of the above, and it aims at providing the scroll compressor which can perform capacity control, controlling the pressure loss by over compression.

In order to achieve the above object, a scroll compressor according to the present invention is formed on a fixed scroll having a spiral fixed wrap formed on one side of a fixed end plate, and on one side of a turning end plate. Formed between the fixed scroll and the orbiting scroll by means of an orbiting scroll having a spiral swirling wrap which is pivotably arranged with respect to the fixed scroll, and meshing between the orbiting wrap and the fixed wrap A compression chamber, a refrigerant supply unit for supplying a gas refrigerant from the outside to the compression chamber, a bypass passage connecting the compression chamber and the refrigerant supply unit, a capacity control valve for opening and closing the bypass passage, The valve body included in the displacement control valve includes a valve body hole communicating the rear end side opening opened in the rear end face and the tip end side opening opened in the front end side, and the valve closing position In the state of being located in the Part is closed to block the bypass passage, while located in the open position, the tip side opening is opened, characterized by opening the bypass passage.

ADVANTAGE OF THE INVENTION According to this invention, the scroll compressor which can perform capacity control can be provided, suppressing the pressure loss by overcompression.

It is a sectional view showing the compression mechanism which constitutes the scroll compressor of a 1st embodiment. It is a perspective view which shows the valve body which comprises the displacement control valve of 1st Embodiment. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 opened. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 closed. It is a perspective view which shows the valve body which comprises the displacement control valve of 2nd Embodiment, and a bypass port. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 opened. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 closed. It is a perspective view which shows the valve body which comprises the displacement control valve of 3rd Embodiment. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 opened. It is a principal part enlarged view which shows the state which the displacement control valve in FIG. 1 closed.

First Embodiment
A first embodiment of the present invention will be described in detail with reference to the drawings. In the description, the same elements will be denoted by the same reference signs and redundant description will be omitted.
The compression mechanism 2 constituting the scroll compressor 1 of the present invention is shown in FIGS.

The compression mechanism 2 is configured to compress the gas refrigerant introduced into the scroll compressor 1 to a high pressure, and is driven by an electric motor (not shown). The compression mechanism 2 also includes a drive shaft 10, a scroll case 20, a orbiting scroll 30, a fixed scroll 40, an Oldham ring 50, and a variable displacement means 60.
The drive shaft 10 doubles as an output shaft of the electric motor, and is rotatably supported about the axis. Further, the drive shaft 10 is provided with an eccentric cam 11 at its tip.
The eccentric cam 11 is constituted by a cylindrical protrusion which is provided eccentrically from the axial center of the drive shaft 10.

Next, the scroll case 20 will be described (see FIG. 1).
The outer shape of the scroll case 20 is constituted by a cylindrical wall portion 21 having a cylindrical shape and a bottom plate portion 22 closing one end of the cylinder wall portion 21. In the cylinder wall portion 21, an outer peripheral flange portion 43 of a fixed scroll 40 described later is fastened. The scroll case 20 and the fixed scroll 40 form a storage chamber RS. The orbiting scroll 30 and the Oldham ring 50 are accommodated in the accommodation room RS.
Further, the scroll case 20 is provided with a support portion 23.
The bearing portion 23 is constituted by a bearing disposed at the center of the bottom plate portion 22 and rotatably supports the drive shaft 10.

Next, the orbiting scroll 30 will be described (see FIG. 1).
The orbiting scroll 30 is accommodated pivotably in the accommodation chamber RS. The orbiting scroll 30 also includes an orbiting mirror plate 31, an orbiting wrap 32, and an orbiting bearing 33.
The turning end plate 31 is formed of a disk-like member capable of turning in the cylindrical wall portion 21 of the scroll case 20.
The orbiting wrap 32 is composed of a spiral wall projecting from the surface facing the fixed scroll 40.
The orbiting bearing 33 is constituted by a round hole disposed at the center of the surface (the back surface of the orbiting wrap 32) of the orbiting end plate 31 facing the scroll case 20. The eccentric cam 11 is rotatably fitted in the round hole of the turning bearing 33 without rattling.

Next, the fixed scroll 40 will be described (see FIG. 1).
The fixed scroll 40 and the orbiting scroll 30 constitute a compression chamber RC. The fixed scroll 40 includes a fixed end plate 41, a fixed wrap 42, an outer peripheral flange 43, an inlet 44, and an outlet 45.
The fixed end plate 41 is formed of a disk-shaped member having the same diameter as the bottom plate portion 22 of the scroll case 20.
The fixed wrap 42 is formed of a spiral groove projecting from the surface facing the orbiting scroll 30. The fixed wrap 42 meshes with the orbiting wrap 32 of the orbiting scroll 30 to form an extension-side compression chamber on the inside of the orbiting wrap 32 and an outside-side compression chamber on the outside of the orbiting wrap 32.

The outer peripheral flange portion 43 is fastened to the cylindrical wall portion 21 of the scroll case 20 by a plurality of bolts (not shown), and the fixed scroll 40 is fixed to the scroll case 20.
The suction port 44 (refrigerant supply unit) is a supply port for supplying the gas refrigerant to the compression chamber RC from the outside. The suction port 44 is formed by a through hole which is open at the groove bottom portion of the outer peripheral groove end portion of the fixed wrap 42 and penetrates the fixed end plate 41.
The discharge port 45 is a discharge port for discharging the gas refrigerant compressed in the compression chamber RC to the outside. The discharge port 45 is formed by a through hole which is opened at a groove bottom portion of a central portion of the fixed wrap 42 and penetrates the fixed end plate 41.

Next, the Oldham ring 50 will be described (see FIG. 1).
The Oldham ring 50 is a substantially annular member, and is disposed between the scroll case 20 and the orbiting scroll 30 in the accommodation chamber RS. Then, the Oldham ring 50 is displaced between the scroll case 20 and the orbiting scroll 30 in conjunction with the orbiting scroll 30 to regulate rotation when the orbiting scroll 30 orbits.

Next, the variable capacitance means 60 will be described (see FIGS. 1 to 4).
The variable displacement means 60 is a structure for selectively switching the capacity of the compression chamber RC between a high capacity (high compression ratio) and a low capacity (low compression ratio). And, in the case of a high capacity, the entire volume of the compression chamber RC is used for the compression of the gas refrigerant, and in the case of a low capacity, a part of the volume of the compression chamber RC (the outlet 45 side) is a compression of the gas refrigerant Used for
The variable displacement means 60 also includes a bypass port 61, a displacement control valve 62, and a control pipe 63.

As shown in FIG. 3 and FIG. 4, the bypass port 61 penetrates the plate surface of the fixed end plate 41, and is configured by a stepped through hole in which holes having different diameters are connected in series. Further, the bypass port 61 includes a small diameter hole 61a, a large diameter hole 61b, and a guide sleeve 61c.
The small diameter hole portion 61 a constitutes a small diameter portion of the stepped through hole, and opens at the groove bottom portion of the fixed wrap 42.

The large diameter hole portion 61 b constitutes a large diameter portion of the stepped hole. Further, the large diameter hole 61b is a hole that opens to a plate surface (a back surface of the fixed wrap) opposite to the fixed wrap 42 in the fixed end plate 41, and is set larger in diameter than the small diameter hole 61a.
The inner diameter of the large diameter hole 61b is set to the same dimension as the outer diameter of the front end of the guide sleeve 61c, and the guide sleeve 61c is inserted into the large diameter hole 61b.
A stepped portion which is a boundary between the small diameter hole portion 61a and the large diameter hole portion 61b is set as the port stepped portion 61d.

The guide sleeve 61c is a structure for guiding a slide of a valve body 62a described later. The guide sleeve 61c is formed of a cylindrical body having a stepped outer shape whose front end is smaller in diameter than the rear end.
The front end portion of the guide sleeve 61c is inserted into the large diameter hole portion 61b. Further, at a rear end of the guide sleeve 61c, a collecting pipe line 63c of a control pipe 63 described later is inserted.

Next, the displacement control valve 62 will be described (see FIGS. 1 to 4).
The displacement control valve 62 is configured to open and close the bypass port 61 and the bypass passage 71, and includes a valve body 62a and a valve spring 62b.
The bypass passage 71 communicates the compression chamber RC and the suction port 44 (refrigerant supply unit) as a path for returning a part of the gas refrigerant in the compression chamber RC to the refrigerant supply unit side.
The valve body 62a has a stepped cylindrical shape in which cylinders having different diameters are connected in series. Further, the valve body 62a is constituted by a large diameter columnar portion 62aa and a small diameter columnar portion 62ab, and the valve body hole 62ac penetrates (see FIG. 2).

The valve body 62a is slidably disposed in the bypass port 61 between the valve opening position and the valve closing position.
The valve opening position indicates the position where the valve body 62a is located when the volume control valve 62 is opened, and the valve closing position means the location where the valve body 62a is located when the volume control valve 62 is closed. Show.

The large diameter columnar portion 62aa has a cylindrical shape, and constitutes a rear end portion of the valve body 62a.
Further, the outer diameter of the large diameter columnar portion 62aa is set to the same dimension as the inner diameter of the guide sleeve 61c.
That is, the guide sleeve 61c is set to such a dimension that the large diameter columnar portion 62aa can slide without rattling in the guide sleeve 61c.

The small diameter columnar portion 62ab has a cylindrical shape smaller in diameter than the large diameter columnar portion 62aa and coaxially disposed on the large diameter columnar portion 62aa, and constitutes a front end portion of the valve body 62a.
Further, the outer diameter of the small diameter columnar portion 62 ab is set to the same dimension as the inner diameter of the small diameter hole portion 61 a in the bypass port 61.
That is, the small diameter hole portion 61a is set to a dimension such that the small diameter columnar portion 62ab can slide in the small diameter hole portion 61a without a gap.
In addition, the step part used as the boundary part of large diameter columnar part 62aa and small diameter columnar part 62ab is set to valve body step part 62ad.

The valve body hole 62ac is constituted by a substantially T-shaped through hole communicating the rear end surface of the large diameter columnar portion 62aa with the side surface of the small diameter columnar portion 62ab (see FIG. 2). Then, an opening that opens to the rear end surface of the large diameter columnar portion 62aa is referred to as a rear end side opening 62e, and an opening that opens to the side surface of the small diameter columnar portion 62ab is referred to as a tip side opening 62f.

The valve spring 62b is a wound spring, and is wound around the small diameter columnar portion 62ab, and is held in a compressed state between the valve body stepped portion 62ad and the port stepped portion 61d. For this reason, the valve spring 62b biases the valve body 62a in the direction in which the valve opens due to the repulsive force.

Next, the control pipe 63 will be described (see FIG. 1).
The control pipe 63 is configured to selectively apply the suction pressure Ps or the storage chamber pressure Pb to the rear end surface of the valve body 62a via the gas refrigerant. And control piping 63 is provided with suction side pipe line 63a, lubricating oil supply side pipe line 63b, collecting pipe line 63c, and three-way valve 63d.
One end of the suction side pipe line 63a is connected to a suction port 44 (a refrigerant supply unit) through which the gas refrigerant is supplied to the scroll compressor 1 from the outside.

One end of the lubricating oil supply pipe 63 b (intermediate pressure pipe) is connected to the storage chamber RS. Further, a pressure reducing valve 63e is installed in the lubricating oil supply pipe 63b in the middle of the pipe as a pressure adjusting means.
The pressure reducing valve 63e (pressure adjusting means) is configured to reduce the pressure in the storage chamber RS (storage chamber pressure Pb) to an appropriate pressure (intermediate pressure Pm).
The pressure (intermediate pressure Pm) after pressure reduction by the pressure reducing valve 63e is set such that the following valve opening state and valve closing state are compatible with the spring constant of the valve spring 62b.

When the valve is opened, the suction pressure Ps is applied to the rear end surface (the rear end surface of the large diameter columnar portion 62aa) of the valve body 62a. However, as shown in FIG. 4, the valve spring 62b urges and holds the valve body 62a in the valve opening position against the suction pressure Ps, and opens the small diameter hole 61a of the bypass port 61 (the valve open state). .
When the valve is closed, the pressure (intermediate pressure Pm) adjusted by the pressure reducing valve 63e is applied to the rear end face side of the valve body 62a. As shown in FIG. 3, the valve spring 62b is compressed by the intermediate pressure Pm, the valve body 62a moves to the valve closing position, and the small diameter hole 61a of the bypass port 61 is closed (valve closing state).
In addition, since the pressure-reduction valve 63e is a structure generally used, the detailed description of a structure is abbreviate | omitted.

One end of the collecting conduit 63c is connected to the guide sleeve 61c.
The other ends of the suction side conduit 63a, the lubricating oil supply side conduit 63b, and the collecting conduit 63c are connected to a three-way valve 63d.
By operating the three-way valve 63d, the communication between the suction port 44 and the guide sleeve 61c and the communication between the storage chamber RS and the guide sleeve 61c are selectively switched.
Then, the pressure applied to the rear end face of the valve body 62a is switched to the suction pressure Ps or the intermediate pressure Pm by the switching operation of the three-way valve 63d.

Next, the operation of the variable capacitance means 60 will be described.
<When the scroll compressor 1 is used at high capacity (high compression ratio) (see FIGS. 1 and 3)>
The three-way valve 63d is operated to connect the lubricating oil supply side conduit 63b and the collecting conduit 63c, and an intermediate pressure Pm is applied to the rear end of the valve body 62a via the gas refrigerant. By applying the intermediate pressure Pm to the rear end surface of the valve body 62a, the valve spring 62b is compressed, and the valve body 62a moves to the valve closing position.
In the valve closed position, the front end portion (small diameter columnar portion 62ab) of the valve body 62a is inserted into the bypass port 61, and the front end surface of the small diameter columnar portion 62ab abuts on the turning wrap 32.
That is, at the time of valve closing, the front end surface is located on the same plane as the groove bottom portion of the fixed wrap 42.

In this state, the valve body 62 a closes the small diameter hole portion 61 a of the bypass port 61. Then, as the small diameter columnar portion 62ab is inserted into the small diameter hole portion 61a, the peripheral wall of the small diameter hole portion 61a closes the front end side opening 62f of the valve body 62a.
Thereby, the bypass passage 71 is shut off.
Further, since the intermediate pressure Pm to be applied is higher than the pressure in the compression chamber RC immediately after the start of compression, fine-grained lubricating oil mixed with the gas refrigerant travels along the pipe wall of the control pipe 63 and the valve body 62a The gap with the bypass port 61 is entered.

Thereby, the airtightness of the displacement control valve 62 at the time of valve closing is improved.
That is, the storage chamber RS functions as a lubricating oil supply unit, and the lubricating oil is supplied to the displacement control valve 62 through the control pipe 63.
When the displacement control valve 62 shuts off the bypass port 61, the entire volume of the compression chamber RC is used for compression, and the compression ratio becomes a high compression ratio.
And the case where the scroll compressor 1 is operated in this state is called high load operation (high capacity operation).

<When the scroll compressor 1 is used at low capacity (low compression ratio) (see FIGS. 1 and 4)>
The three-way valve 63d is operated to connect the suction side conduit 63a and the collecting conduit 63c, and apply the suction pressure Ps to the rear end of the valve body 62a via the gas refrigerant.
By applying the suction pressure Ps to the rear end surface of the valve body 62a, the repulsive force of the valve spring 62b resists the suction pressure Ps to move the valve body 62a to the valve opening position.
In the valve open position, the front end portion of the valve body 62a is separated from the small diameter hole portion 61a of the bypass port 61, and the rear end portion of the valve body 62a abuts on the front end of the guide sleeve 61c.

In this state, the compression chamber RC and the large diameter hole 61 b of the bypass port 61 communicate with each other. Then, as the front end portion of the valve body 62a is separated from the small diameter hole portion 61a, the front end side opening portion 62f of the valve body hole 62ac closed by the peripheral wall of the small diameter hole portion 61a is opened.
As a result, the small diameter hole portion 61a, the large diameter hole portion 61b, the valve body hole 62ac, the collecting conduit 63c, and the suction side conduit 63a are communicated in this order to bypass the compression chamber RC and the suction port 44 (refrigerant supply portion). Bypass path 71 is opened.

With the bypass passage 71 opened, the gas refrigerant supplied from the suction port 44 to the compression chamber RC is discharged from the bypass port 61 to the suction port 44 without being compressed. Then, the gas refrigerant is compressed by the volume from the bypass port 61 to the discharge port 45 in the compression chamber RC.
When the displacement control valve 62 opens the bypass port 61, a part of the volume of the compression chamber RC is used for compression, and the compression ratio is a low compression ratio.
And the case where the scroll compressor 1 is operated in this state is called low load operation (low capacity operation).

Next, the operation and effect of the scroll compressor 1 according to the present embodiment will be described.
The valve body 62a constituting the displacement control valve 62 of the present embodiment includes a valve body hole 62ac communicating with a rear end side opening 62e opening in the rear end face and a front end side opening 62f opening in the side face of the front end. ing. Then, the valve body hole 62 ac constitutes a part of the bypass passage 71.
Further, in a state where the valve body 62a is located at the valve closing position, the tip end side opening 62f is closed so as to close the bypass passage 71.

Then, in a state where the valve body 62a is located at the valve opening position, the tip end side opening 62f is opened, and the bypass passage 71 is set to be opened.
With such a configuration, during capacity control (during low capacity operation), the gas refrigerant is supplied and discharged from the bypass port 61 into the compression chamber RC in addition to the suction port 44 (refrigerant supply unit). Can.
As a result, the refrigerant can be bypassed regardless of the rotation angle of the orbiting scroll 30, so that the capacity control operation (low capacity operation) can be performed while suppressing the pressure loss due to the overcompression.

In the present embodiment, in the state where the displacement control valve 62 is closed, the lubricating oil supply side conduit 63b (intermediate pressure side conduit) and the collecting conduit 63c communicate with each other through the three-way valve 63d (switching means). 72 are formed. An oil film is formed in the gap between the valve body 62 a and the bypass port 61 by the lubricating oil mixed with the gas refrigerant supplied from the storage chamber RS to the capacity control valve 62 through the lubricating oil passage 72.
By forming an oil film in the gap between the valve body 62a and the bypass port 61, the air tightness of the displacement control valve 62 is enhanced, and the leakage of the refrigerant when the valve is closed is suppressed. It can be enhanced.
In addition, the lubricating oil exudes from the gap into the compression chamber RC, whereby lubrication between the tip of the orbiting wrap 32 and the fixed scroll 40 can be performed.

In the displacement control valve 62 of the present embodiment, when the valve is closed, the pressure applied to the rear end face of the valve body 62a causes the valve body 62a to resist the spring force of the valve spring 62b, and its tip end is in the compression chamber RC. It is biased to protrude into the
With such a configuration, the tip end face of the valve body 62 a abuts on the turning wrap 32 at the time of valve closing (during high capacity operation).
As a result, the space where the refrigerant can not be compressed in the bypass port 61 and the leakage of the refrigerant can be reduced, and the compression efficiency can be enhanced during high capacity operation.

In the present embodiment, the pressure reducing valve 63e (pressure adjusting means) is provided to the lubricating oil supply side pipeline 63b (intermediate pressure side pipeline) located between the storage chamber RS (lubricating oil supply unit) and the displacement control valve 62. Is arranged.
The pressure reducing valve 63e is disposed to adjust the pressure of the gas refrigerant supplied from the storage chamber RS.
For example, when the pressure of the storage chamber RS is supplied as it is and the force of pushing the turning wrap 32 by the tip end face of the valve body 62 a is too strong, the turning wrap 32 may be separated from the fixed scroll 40.

As a countermeasure against this, when the force to press the orbiting scroll 30 against the stationary scroll 40 is strengthened, the frictional resistance with the stationary scroll 40 when the orbiting scroll 30 orbits increases, and the operating efficiency decreases.
Therefore, in order to adjust the force pressing the orbiting scroll 30 against the fixed scroll 40 to an appropriate strength, a pressure reducing valve 63e is disposed.
As a result, the compression efficiency can be enhanced while suppressing the decrease in the operation efficiency during high capacity operation.

In the present embodiment, the spring constant of the valve spring 62b is such that the load exerted on the valve body 62a by the gas refrigerant at the time of closing the valve resists the spring force of the valve spring 62b to move the valve body 62a from the valve opening position to the valve closing position. It is set to be movable.
With such a setting, when closing the displacement control valve 62, the valve body 62a can be reliably moved to the valve closing position.
As a result, it is possible to prevent the gas refrigerant from flowing out of the cylinder and flowing into the compression chamber RC without closing the capacity control valve 62.

Second Embodiment
Next, a second embodiment of the scroll compressor 1 will be described with reference to FIGS. 5 to 7. The same code | symbol is attached | subjected to the structure similar to the above-mentioned scroll compressor 1, and the overlapping description is abbreviate | omitted.
As shown in FIG. 5 to FIG. 7, the configuration largely different from the first embodiment described above is the shape of the bypass port 61 of the variable capacitance means 60.
A port groove 61 e is provided on the peripheral wall of the small diameter hole 61 a constituting the bypass port 61.
The port groove 61e has a substantially rectangular cross section at a position facing the tip side opening 62f of the valve body 62a located at the valve closing position in the circumferential wall of the small diameter hole 61a, and extends toward the valve opening side (See FIG. 5).

Next, the operation of the variable capacitance means 60 will be described.
<When the scroll compressor 1 is used at high capacity (high compression ratio) (see FIG. 6)>
The valve body 62a is located at the valve closing position as in the first embodiment.
In this state, in the valve body 62a, the small diameter columnar portion 62ab is inserted into the small diameter hole portion 61a, and the small diameter hole portion 61a of the bypass port 61 is closed.

<When the scroll compressor 1 is used at low capacity (low compression ratio) (see FIG. 7)>
When the valve body 62a is located at the valve opening position, the tip of the small diameter columnar portion 62ab remains in the small diameter hole 61a, but the small diameter hole 61a and the large diameter hole 61b are formed through the port groove 61e. It is in communication.
As a result, the small diameter hole portion 61a, the port groove 61e, the valve body hole 62ac, the collecting conduit 63c, and the suction side conduit 63a are sequentially communicated and the bypass passage 71 bypassing the compression chamber RC and the suction port 44 is opened. (See Figure 1).

Next, the operation and effect of the scroll compressor 1 according to the present embodiment will be described.
In the valve body 62a of the first embodiment, the small diameter columnar portion 62ab is separated from the small diameter hole portion 61a at the valve opening position.
Therefore, when the valve body 62a moves from the valve opening position to the valve closing position, the small diameter columnar portion 62ab may not easily enter the small diameter hole portion 61a due to the influence of dimensional accuracy, thermal expansion due to temperature change, etc. is there.
However, in the present embodiment, the bypass passage 71 can be opened while leaving the tip of the small diameter columnar portion 62ab in the small diameter hole portion 61a.
By this, the movement from the valve opening position of the valve body 62a to the valve closing position can be performed more reliably.

Third Embodiment
Next, a third embodiment of the scroll compressor 1 will be described with reference to FIGS. 8 to 10. The same code | symbol is attached | subjected to the structure similar to the above-mentioned scroll compressor 1, and the overlapping description is abbreviate | omitted.
As shown in FIGS. 8 to 10, the configuration which is largely different from the first embodiment described above is the shape of the valve body hole 62ac opened in the valve body 62a constituting the displacement control valve 62 and the shape of the guide sleeve 61c. .
The valve body hole 62ac is formed of a substantially T-shaped through hole communicating the rear end surface of the large diameter columnar portion 62aa with the side surface of the large diameter columnar portion 62aa (see FIG. 8).
Then, an opening that opens to the rear end face of the large diameter columnar portion is referred to as a rear end side opening 62e, and an opening that opens to the side surface of the large diameter columnar portion is referred to as a front end side opening 62f.
The inner diameter of the guide sleeve 61c on the tip end side of the portion facing the tip end opening 62f is expanded (sleeve enlarged diameter portion 61f) when the valve body 62a is positioned at the valve opening position.

Next, the operation of the variable capacitance means 60 will be described.
<When the scroll compressor 1 is used at high capacity (high compression ratio) (see FIG. 9)>
The valve body 62a is located at the valve closing position as in the first embodiment.
In this state, in the valve body 62a, the small diameter columnar portion 62ab is inserted into the small diameter hole portion 61a, and the small diameter hole portion 61a of the bypass port 61 is closed.

<When using the scroll compressor 1 at low capacity (low compression ratio) (see FIG. 10)>
When the valve body 62a is located at the valve closing position, the small diameter columnar portion 62ab separates from the small diameter hole portion 61a, and the valve body step portion 62ad moves to the sleeve enlarged diameter portion 61f. It communicates with the sleeve enlarged diameter portion 61f (see FIG. 1).
As a result, the small diameter hole portion 61a, the large diameter hole portion 61b, the sleeve enlarged diameter portion 61f, the valve body hole 62ac, the collecting pipe line 63c, and the suction side pipe line 63a communicate in this order, and the compression chamber RC and the suction port The bypass path 71 that bypasses the supply portion is opened.

Next, the operation and effect of the scroll compressor 1 according to the present embodiment will be described.
In the valve body 62a of the present embodiment, the valve body hole 62ac is configured with a substantially T-shaped through hole that communicates the rear end surface of the large diameter columnar portion 62aa with the side surface of the large diameter columnar portion 62aa. The same effect as that of the embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 scroll compressor 30 turning scroll 31 turning end plate 32 turning wrap 40 fixed scroll 41 fixed end plate 42 fixed wrap 44 suction port (refrigerant supply part)
61 bypass port 61 e port groove 62 volume control valve 62 a valve body 62 ac valve body hole 62 b valve spring 62 e rear end side opening 62 f front end side opening 63 a suction side pipeline 63 b lubricating oil supply side pipeline (intermediate pressure side pipeline)
63c Collecting pipeline 63d Three-way valve (switching means)
63e Pressure reducing valve (pressure adjusting means)
71 bypass passage 72 lubricating oil passage RC compression chamber RS accommodation chamber (lubricating oil supply unit)

Claims

A fixed scroll having a spiral fixed wrap formed on one side of the fixed end plate;
An orbiting scroll having a spiral orbiting wrap formed on one surface of an orbiting mirror plate, the orbiting scroll being pivotally arranged with respect to the fixed scroll;
A compression chamber formed between the fixed scroll and the orbiting scroll by meshing between the orbiting wrap and the fixed lap;
A refrigerant supply unit that supplies gas refrigerant from the outside to the compression chamber;
A bypass passage communicating the compression chamber with the refrigerant supply unit;
A displacement control valve for opening and closing the bypass passage;
Equipped with
The valve body included in the volume control valve is
A rear end side opening that opens to the rear end face;
A tip side opening that opens to the tip side,
Equipped with a valve hole that communicates
In the closed position, the distal opening is closed to block the bypass passage,
A scroll compressor characterized in that the tip end side opening portion is opened to open the bypass passage in a state of being located at the valve opening position.
A suction side conduit whose one end communicates with the refrigerant supply unit;
An intermediate pressure side line whose one end communicates with the lubricating oil supply unit;
And an collecting pipe whose one end communicates with the displacement control valve;
Each other end of the suction side pipe line, the intermediate pressure side pipe line, and the collecting pipe line is connected via switching means,
Communication between the suction side conduit and the collecting conduit through the switching means forms the bypass passage,
The scroll compressor according to claim 1, wherein a lubricating oil passage is formed by communication between the intermediate pressure side conduit and the collecting conduit through the switching means.
The valve body is
The scroll compressor according to claim 1, characterized in that when the valve is closed, the tip end face thereof is biased so as to abut on the turning wrap.
The scroll compressor according to claim 2, characterized in that the intermediate pressure side pipeline is provided with pressure adjusting means.
A valve spring for urging the valve body from the valve closing position side to the valve opening position side;
The valve spring has a spring constant of
When the intermediate pressure side pipe line and the collecting pipe line communicate with each other, the load exerted on the valve body by the gas refrigerant supplied from the lubricating oil supply portion resists the spring force of the valve spring, and the valve The scroll compressor according to claim 2, characterized in that the body is movably set from the valve opening position to the valve closing position.
Configuring the bypass path,
The valve body located at the valve closing position is insertable,
A bypass port comprising a through hole penetrating the fixed end plate;
The bypass port is
2. The scroll compressor according to claim 1, further comprising a port groove extending toward the valve-opening side at a portion of the peripheral wall opposed to the tip end side opening portion of the valve body located at the valve closing position.