KR20050097343A - Bypass valve assembly for capacity variable type rotary compressor - Google Patents

Abstract

The present invention relates to a bypass valve assembly of a variable displacement rotary compressor, and by modularizing the bypass valve assembly, the assembly process can be simplified to improve productivity, while preventing the leakage of compressed refrigerant gas and reducing the dead volume. A bypass valve assembly of a variable displacement rotary compressor can be reduced. To this end, the present invention forms a bypass hole for bypassing a part of the refrigerant gas compressed in one side of the inner space of the rotary compressor, and is installed in the mounting space portion communicating with the bypass hole to selectively select the bypass hole. A bypass valve assembly that opens and closes and varies a capacity of a rotary compressor, the bypass valve assembly comprising: a valve plate flowing by a pressure difference and opening and closing the bypass hole; A valve guide mounted in close contact with an interface between the bypass hole and the mounting space, for accommodating the valve plate to flow along the thickness direction thereof and for guiding the flow of the valve plate; It provides a bypass valve assembly of a variable displacement rotary compressor comprising a; a fixing member coupled to the inner peripheral surface of the front end of the valve guide to achieve a modularity with the valve plate and the valve guide.

Description

BYPASS VALVE ASSEMBLY FOR CAPACITY VARIABLE TYPE ROTARY COMPRESSOR}

The present invention relates to a rotary compressor, and more particularly to a bypass valve assembly of a variable displacement rotary compressor.

Generally, a compressor is a device that compresses a fluid such as refrigerant gas, and the compressor is classified into a rotary compressor, a reciprocating compressor, a scroll compressor, and the like according to a method of compressing the fluid.

At this time, the rotary compressor is provided with a power mechanism unit and a compression mechanism unit in one casing, respectively, and coupled to the rotating mechanism and the compression mechanism unit on both ends of one rotary shaft to transmit the rotational force of the transmission mechanism to the compressor sphere to the refrigerant from the compressor sphere to the refrigerant. To generate a compressive force.

As described above, most rotary compressors are applied to air conditioners such as air conditioners. Recently, in response to the multifunctionalization of air conditioners, a variable capacity rotary compressor that can reduce power consumption and improve compressor efficiency is required.

To this end, the conventional method of varying the compressor capacity by controlling the number of revolutions of the compressor is known, but this had to be equipped with a complex controller (for example, an inverter system), such that the manufacturing cost increases There is a disadvantage.

In the related art, a variable displacement rotary compressor, which can vary the capacity of a compressor inexpensively and safely using a bypass valve assembly, has been proposed.

1 is a view showing the structure of a conventional variable displacement rotary compressor, Figure 2 is a conventional variable displacement rotary compressor, a view showing the structure of a cylinder having a bypass valve assembly.

In addition, Figures 3 to 4 is a view showing the structure and operating state of the bypass valve assembly of Figure 2, Figures 5 to 6 is a conventional variable displacement rotary compressor, schematically showing the movement path of the refrigerant gas to be.

As shown, the conventional conventional variable displacement rotary compressor has a casing 10 to form a closed space therein, an electric mechanism unit installed on one side of the casing 10 to provide rotational force, and inside the casing 10. It is configured to include a compressor mechanism for compressing the refrigerant by the rotational force provided from the power mechanism.

The electric mechanism part includes a stator 11 fixedly disposed inside the casing 10, a rotor 12 rotatably disposed inside the stator 11, and a shaft center of the rotor 12. It is composed of a rotating shaft 13 is integrally rotatably coupled and the eccentric portion formed in the lower region.

The compressor mechanism is formed in an annular shape, the main bearing 15 and the sub-bearing to form an inner space together with the cylinder 14 installed in the casing 10 and the left and right sides of the cylinder 14 are covered together. 16 and rotatably coupled to the eccentric portion of the rotating shaft 13, which is pressed into the rotor 12 and supported by the main bearing 15 and the sub-bearing 16 and transmits the rotational force of the cylinder 14 A rolling piston 17 which rotates in the inner space and compresses the refrigerant, and is coupled to the tip of the discharge port 15a provided near the center of the main bearing 15 so as to be openable and closed to restrict the refrigerant discharged from the compression chamber. It comprises a valve 19, and a muffler 20 is provided on the outer surface of the main bearing 15 provided with a resonance chamber to accommodate the discharge valve (19).

A vane disposed on the inner side of the cylinder 14 so as to protrude and retract along the radial direction and contacts the outer diameter surface of the rolling piston 17 to partition the inner space into the suction chamber S and the compression chamber C ( A vane accommodating portion 18a is formed so that the vanes 18 can be coupled, and a spring 18b is formed in the vane accommodating portion 18a to allow the vane 18 to elastically contact the rolling piston 17. ) Is provided.

In addition, an inlet 14a is formed at one side of the cylinder 14 to suck the refrigerant, and is compressed on the other side of the inlet 14a with the vane receiving portion 18a therebetween in the circumferential direction. The discharge port 14b is formed so that the refrigerant can be discharged.

In addition, a gas suction pipe 21 connected to an accumulator (not shown) installed at the side of the casing 10 is coupled to the suction port 14a, and compressed gas is discharged to the outside of the casing 10. The gas discharge pipe 22 is coupled.

On the other hand, a bypass hole 14c for bypassing a part of the compressed refrigerant gas is formed at one side facing the inlet 14a of the cylinder 14, and a circular cross section at the outlet side of the bypass hole 14c. It is provided with a mounting space portion 14d having a bypass valve assembly 24 is installed through this, it will be described as follows.

Further, the first bypass pipe 22a and the second bypass pipe 21a are branched into the gas discharge pipe 22 and the gas suction pipe 21, respectively, and the bypass pipes 21a and 22a are respectively It is connected to the connecting pipe 31 which is connected to the bypass hole 14c through a three way valve 30.

At this time, the three-way valve 30 is adjusted so that the connecting pipe 31 can communicate with the first bypass pipe 22a or the second bypass pipe 21a by the control of the control unit 32.

The bypass valve assembly 24 is in close contact with the interface between the bypass hole 14c and the mounting space portion 14d to block leakage and the gasket 25 to be in close contact with the gasket 25. The valve seat 26 to be formed and, in close contact with the valve surface of the valve seat 26 and the valve plate 27 for controlling the bypass of the refrigerant gas by opening or blocking the bypass hole (14c) and The valve guide 28 accommodates the valve plate 27 therein and guides the flow of the valve plate 27, and the valve spring 29 elastically supports and fixes the valve guide 28. It is configured to include.

The gasket 25 and the valve seat 26 are formed in a disk shape having a diameter corresponding to the diameter of the mounting space portion 14d, and through holes are formed in the center portion thereof so as to communicate with the bypass hole 14c. 25a, 26a are formed.

The valve guide 28 has a hollow cylindrical shape communicating with the bypass hole 14c, and a body 28a having a seating surface formed thereon so that the valve plate 27 can be seated at one end thereof, and the body ( Consists of a plurality of guide members (28b) having a length longer than 28a and integrally spaced apart at regular intervals on the circumferential surface of the body (28a), the valve plate 27 is each guide member It is disposed between the inner circumferential surface of the 28b can flow along the thickness direction, and is compressed in the compression chamber (C) of the cylinder 14 through the gas discharge groove (28c) formed between each guide member (28b) The refrigerant gas may be discharged to the connection pipe 31.

In addition, the refrigerant gas supplied from the connecting pipe 31 passes through the gas through hole 28d formed at the center of the body 28a, and the valve plate 27 may be pressed against the valve seat 26.

The valve spring 29 is formed of a compression spring, but one end is fixedly installed through a spring groove 29a formed on the inner circumferential surface of the mounting space 14d to elastically support and fix the valve guide 28. The end portion of the valve spring 29 coupled to the spring groove 29a is wound to have a larger diameter than other portions.

Therefore, in the conventional rotary compressor having the above-described structure, the rotary shaft 13 rotates as power is applied to the electric mechanism, and thus the rolling piston 17 connected to the rotary shaft 13 has a cylinder 14. The eccentric rotation in the inner space to compress the refrigerant gas, the compressed high-pressure refrigerant gas is discharged to the refrigeration cycle device through the gas outlet pipe 22 through the casing (10).

Here, in the initial start-up of the compressor, that is, when a relatively large refrigeration capacity is required (power operation mode), as shown in FIG. 5, the second bypass pipe branched from the gas suction pipe 21 under the control of the control unit 32. The three-way valve 30 is adjusted so that the first bypass pipe 22a and the connection pipe 31 communicate with each other in a state where the pipe 21a is blocked.

Due to this structure, some of the high-pressure refrigerant gas discharged through the discharge pipe 22 is supplied back to the cylinder side through the first bypass pipe 22a, and the first bypass pipe 22a is provided. The high pressure refrigerant gas supplied through the pressure pressurizes the valve plate 27 of the bypass valve assembly 24. The valve plate 27 is in close contact with the valve face of the valve seat 26 by the pressure. The bypass hole 14c is blocked.

Accordingly, the refrigerant gas compressed in the compression chamber C of the cylinder 14 is discharged through the discharge port 15a and the casing 10 without being discharged through the bypass valve assembly 24. It is discharged to the refrigeration cycle apparatus through 22.

On the other hand, when the operation of the compressor is stable, that is, when a relatively small refrigeration capacity is required (saving operation mode), as shown in FIG. 6, the gas discharge pipe 22 is branched out under the control of the control unit 32. The three-way valve 30 is adjusted such that the second bypass pipe 21a and the connection pipe 31 communicate with each other while the first bypass pipe 22a is blocked.

By this structure, a part of the refrigerant gas that has been compressed in the compression chamber C of the cylinder 14 is discharged to the second bypass pipe 21a through the bypass valve assembly 24, and thus the cylinder ( The amount of refrigerant gas discharged to the casing 10 from the compression chamber C of FIG. 14 is reduced to reduce the cooling capacity of the refrigeration cycle apparatus.

At this time, the low-pressure refrigerant gas flowing through the gas suction pipe 21 flows into the second bypass pipe 21a branched from the gas suction pipe 21, and thus the valve plate 27 of the bypass valve assembly 24. ) Can be pressurized to a predetermined pressure, but the pressure for pressurizing the valve plate 27 is lower than the pressure of the compression chamber C so that the valve plate 27 is pushed toward the valve guide 28 and the bypass hole 14c is pressed. To be opened.

However, the conventional bypass valve assembly 24 having the above-described structure is not only complicated in configuration, but also has a problem in that productivity is reduced because each component is individually assembled.

In addition, in the conventional bypass valve assembly 24, the valve plate 27 is in contact with the valve face of the valve seat 26 to block or open the bypass hole 14c. May leak or be lost, as well as the dead volume of the valve seat 26 and the gasket 25, thereby degrading the performance of the compressor.

Accordingly, the present invention has been made in order to solve the above problems, by modularizing the bypass valve assembly, it is possible to simplify the assembly process to improve the productivity, and to prevent the leakage of the compressed refrigerant gas and the carcass It is an object of the present invention to provide a bypass valve assembly of a variable displacement rotary compressor that can reduce the enemy.

The present invention for achieving the above object, is formed in the mounting space portion in communication with the bypass hole to form a bypass hole for bypassing a portion of the refrigerant gas to be compressed in one side of the inner space of the rotary compressor A bypass valve assembly for selectively opening and closing the bypass hole and varying the capacity of the rotary compressor, the bypass valve assembly comprising: a valve plate flowing by a pressure difference and opening and closing the bypass hole; A valve guide mounted in close contact with an interface between the bypass hole and the mounting space, for accommodating the valve plate to flow along the thickness direction thereof and for guiding the flow of the valve plate; And a fixing member coupled to the inner circumferential surface of the tip of the valve guide to achieve modularity with the valve plate and the valve guide.

In addition, the fixing member is characterized in that the radially reduced and elastically deformable snap ring.

In addition, the diameter of the inner circumferential surface of the snap ring is formed to have a diameter smaller than the diameter of the valve plate to prevent the valve plate from being separated.

In addition, the snap ring is accommodated in the coupling groove formed to have a width corresponding to the width of the snap ring on the inner peripheral surface of the valve guide front end, characterized in that the elastic coupling.

In addition, the seating portion of the snap ring seated in the coupling groove is characterized in that formed to form a flat surface.

The valve contact part may further include a valve contact part protruding to communicate with the bypass hole at a boundary surface of the bypass hole and the mounting space to form a contact surface to be in close contact with the valve plate.

In addition, the valve contact portion is characterized in that the stepped to prevent the height interference with the fixing member.

In addition, the valve contact portion is characterized in that the contact surface is formed to be curved so as to be in linear contact with the valve plate.

In addition, it is characterized in that it further comprises a valve spring fixedly installed through a spring groove formed on the inner peripheral surface of the mounting space to elastically support and fix the valve guide.

In addition, the valve spring is characterized in that it further comprises a coupling protrusion formed integrally protruding in the rear end of the valve guide so as to form a modular with the valve guide coupled to the valve spring.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

7 is a view illustrating a cylinder structure of a rotary compressor having a bypass valve assembly according to the present invention, and FIGS. 8 to 9 are views illustrating a structure of the bypass valve assembly of FIG. 7.

10 is a view illustrating an operating state of the bypass valve assembly of FIG. 7.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted to clarify the gist of the present invention.

As shown, the cylinder 24 of the rotary compressor equipped with the bypass valve assembly according to the present invention, the inner side of one side is arranged to protrude and retract along the radial direction and contact the outer diameter surface of the rolling piston 27 And a vane accommodating portion 28a is formed so that the vanes 28 for dividing the internal space into the suction chamber S and the compression chamber C can be coupled to each other. A spring 28b is provided so that the 28 can elastically contact the rolling piston 27.

In addition, a suction port 24a is formed at one inner side of the cylinder 24 to suck refrigerant, and is compressed on the other side of the suction port 24a with the vane accommodation portion 28a interposed therebetween in the circumferential direction. The discharge port 24b is formed so that the coolant can be discharged.

In addition, the suction port 24a is coupled to a gas suction pipe (not shown) connected to an accumulator (not shown) installed on the side of the casing (not shown), the compressed gas to the outside of the casing The gas discharge pipe (not shown) discharged is combined.

On the other hand, a bypass hole 24c for bypassing a portion of the compressed refrigerant gas is formed at one side facing the inlet 24a of the cylinder 24, and a circular cross section at the outlet side of the bypass hole 24c. It is provided with a mounting space portion 24d having a bypass valve assembly 34 according to the present invention through this, it will be described as follows.

In addition, the first gas discharge pipe and the gas suction pipe are divided into a first bypass pipe and a second bypass pipe (not shown), and each of the bypass pipes is a 3-way valve (not shown). It is connected to the connecting pipe 31 is connected to the bypass hole 24c through.

At this time, the three-way valve is controlled so that the connecting pipe 31 can communicate with the first bypass pipe or the second bypass pipe under the control of a controller (not shown).

The bypass valve assembly 34 according to the present invention includes: a valve plate 36 which flows by a pressure difference and opens and closes the bypass hole 24c; The valve plate 36 is housed in close contact with the interface between the bypass hole 24c and the mounting space portion 24d so that the valve plate 36 can flow along its thickness direction. A valve guide 37 for guiding the flow of water; And a fixing member coupled to the inner circumferential surface of the tip of the valve guide 37 so that the valve plate 36 and the valve guide 37 can be modularized.

The valve guide 37 has a hollow cylindrical shape communicating with the bypass hole 24c, and a body 37a having a seating surface formed thereon so that the valve plate 36 can be seated at one end thereof, and the body ( It is composed of a plurality of guide members (37b) having a length longer than 37a and integrally spaced apart at regular intervals on the circumferential surface of the body (37a), the valve plate formed in a disc shape to have a predetermined diameter ( 36 may be disposed between the inner circumferential surface of each of the guide members 37b and flow along the thickness direction, and the cylinder 24 may be compressed through the gas discharge grooves 37c formed between the guide members 37b. The refrigerant gas compressed in the chamber C may be discharged to the connection pipe 31 through the bypass hole 24c.

In addition, the refrigerant gas supplied from the connecting pipe 31 passes through the gas through hole 37d formed at the center portion of the body 37a of the valve guide 37 and moves the valve plate 36 toward the bypass hole 24c. Can be pressurized.

The fixing member is a radially retractable snap ring 35 that is elastically deformable and is accommodated in a coupling groove 37e formed on the inner circumferential surface of the tip of the valve guide 37 to have a width corresponding to the width of the snap ring 35. Sexually coupled.

In addition, the diameter of the inner circumferential surface of the snap ring 35 is formed to have a diameter smaller than the diameter of the valve plate 36, the valve plate 36 is disposed in the valve guide 37 by such a structure After it is prevented from being separated to the outside through the snap ring 35 coupled to the front end of the valve guide 37.

In addition, the seating portion of the snap ring 35 seated in the coupling groove 37e is formed to form a flat surface. Due to this structure, the snap ring 35 is in close contact with the tip of the valve guide 37. It is coupled to prevent the loss of the valve plate 36 and to form a modular together with the valve guide 37, to reduce the number of parts and assembly labor, as well as to simplify the assembly process to improve productivity. do.

On the other hand, at the interface between the bypass hole 24c and the mounting space portion 24d, a valve contact portion is formed to protrude in communication with the bypass hole 24c to form a contact surface to be in close contact with the valve plate 36 ( 24e) is provided, the valve contact portion 24e is formed with a stepped portion 24f for preventing height interference with the snap ring 35, the contact surface in contact with the valve plate 36 is to be in line contact It is formed to be curved.

With this structure, the valve contact portion 24e can be positioned inside the valve guide 37 without height interference with the snap ring 35 after the modular bypass valve assembly 34 is mounted as described above. In this case, the valve plate 36 flowing according to the pressure difference is in line contact with the valve contact portion 24e and opens and closes the bypass hole 24c, thereby reducing the dead volume due to the use of the conventional gasket and the valve seat. Of course, it is possible to improve the performance of the compressor by preventing leakage of the refrigerant gas is compressed.

Meanwhile, one end of the valve guide 37 is mounted with a valve spring 38 for elastically supporting and fixing the valve guide 37. The valve spring 38 is formed as a compression spring but is formed on an inner circumferential surface of the mounting space 24d. One end is fixedly installed through the groove 38a to elastically support and fix the valve guide 37. At this time, the end of the valve spring 38 coupled to the spring groove 38a is wound to have a larger diameter than other portions. have.

In addition, the rear end of the valve guide 37, the coupling protrusion (37f) having a predetermined size is formed integrally protruding bar, the valve spring 38 is coupled through this to form a modular with the valve guide 37. Can be.

On the other hand, the operation method of the rotary compressor through the bypass valve assembly 34 having the structure as described above is the same as the conventional bar, redundant description thereof will be omitted.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be modified and implemented appropriately within the scope described in the claims.

As described above, according to the bypass valve assembly of the variable displacement rotary compressor according to the present invention by modularizing the bypass valve assembly, it is possible to simplify the assembly process to improve the productivity, to prevent leakage of the refrigerant gas to be compressed In addition, by reducing the dead volume there is an effect that can improve the performance of the compressor.

1 is a view showing the structure of a conventional variable displacement rotary compressor.

Figure 2 is a conventional variable displacement rotary compressor, showing a structure of a cylinder having a bypass valve assembly.

3 to 4 are views showing the structure and operating state of the bypass valve assembly of FIG.

5 to 6 is a conventional variable displacement type rotary compressor, schematically showing the movement path of the refrigerant gas.

7 is a view showing a cylinder structure of a rotary compressor having a bypass valve assembly according to the present invention.

8 to 9 illustrate the structure of the bypass valve assembly of FIG. 7.

FIG. 10 is a view illustrating an operating state of the bypass valve assembly of FIG. 7. FIG.

<Description of the symbols for the main parts of the drawings>

24: cylinder 24c: bypass hole

24d: mounting space 24e: valve contact

24f: step 31: connector

34: bypass valve assembly 35: snap ring

36: valve plate 37: valve guide

37a: body 37b: guide member

37c: Gas discharge groove 37d: Gas through hole

37e: coupling groove 37f: coupling protrusion

38: valve spring 38a: spring groove

Claims (10)

A bypass hole for bypassing a part of the refrigerant gas to be compressed is formed in one side of the inner space of the rotary compressor, and is installed in a mounting space portion communicating with the bypass hole to selectively open and close the bypass hole. A bypass valve assembly for varying capacity, A valve plate which flows by a pressure difference and opens and closes the bypass hole; A valve guide mounted in close contact with an interface between the bypass hole and the mounting space, for accommodating the valve plate to flow along the thickness direction thereof and for guiding the flow of the valve plate; And a fixing member coupled to an inner circumferential surface of the tip of the valve guide to achieve a modularity with the valve plate and the valve guide. 2. The method of claim 1, The fixing member is a bypass valve assembly of a variable displacement rotary compressor, characterized in that the radially shrinking and elastically deformable snap ring. The method of claim 2, Bypass valve assembly of the variable displacement rotary compressor characterized in that the diameter of the inner circumferential surface of the snap ring to have a diameter smaller than the diameter of the valve plate to prevent separation of the valve plate. The method of claim 2 or 3, The snap ring assembly is a bypass valve assembly of a variable displacement rotary compressor characterized in that it is elastically coupled to the coupling groove formed to have a width corresponding to the width of the snap ring on the inner peripheral surface of the valve guide front end. The method of claim 4, wherein Bypass valve assembly of the variable displacement rotary compressor characterized in that the seating portion of the snap ring seated in the coupling groove is formed to form a flat surface. The method of claim 1, The bypass valve of the variable displacement rotary compressor characterized in that it further comprises a valve contact portion protruding in communication with the bypass hole on the interface between the bypass hole and the mounting space to form a contact surface to be in close contact with the valve plate. Assembly. The method of claim 6, The valve contact portion of the bypass valve assembly of the variable displacement rotary compressor, characterized in that the stepped to prevent the height interference with the fixing member is formed. The method according to claim 6 or 7, The valve contact portion of the bypass valve assembly of a variable displacement rotary compressor, characterized in that the contact surface is formed so as to be in linear contact with the valve plate. The method of claim 1, The bypass valve assembly of the variable displacement type rotary compressor characterized in that it further comprises a valve spring fixedly installed through a spring groove formed on the inner circumferential surface of the mounting space to elastically support and fix the valve guide. The method of claim 9, Bypass valve assembly of the variable displacement rotary compressor characterized in that the valve spring is formed integrally projecting to the valve guide rear end so as to form a modularity with the valve guide coupled to the valve spring coupled to the valve spring. .