KR102565101B1 - Control valve for variable capacity type compressor and assembling methd thereof - Google Patents

Abstract

The present invention discloses a variable displacement control valve and an assembling method thereof. The present invention utilizes the ball spring fixing cap, which is an internal part, to set the control valve, as well as to assemble the control valve using simple parts without additional parts, and in particular, to ensure quality (hysteresis) through the use of an adapter. However, instead of the setting adjustment cap, the bellows spring is fixed using a T-shaped fixing cap inside the bellows, so that the control valve can be operated stably after welding and assembling. Efficiently control the intake and discharge amount of gaseous or liquid refrigerant, but increase the flow path blocking efficiency by the ball valve to prevent the inflow or outflow of refrigerant gas into the control room, increase the opening inclination angle of the swash plate when the pressure in the control room decreases, and The operation performance of the variable swash plate type compressor, such as increasing the discharge capacity of refrigerant gas through the increase of the opening inclination angle of the opening, and furthermore, the preparation operation time of the air conditioner can be shortened, while controlling by simplifying parts (eg 14). It is to secure price and quality competitiveness through localization of valves.

Description

Variable displacement control valve and its assembly method {CONTROL VALVE FOR VARIABLE CAPACITY TYPE COMPRESSOR AND ASSEMBLING METHD THEREOF}

The present invention relates to a variable displacement control valve, and more particularly, to efficiently control the suction and discharge amounts of high-pressure gas or liquid refrigerant through a pressure check in a control room, but by increasing the flow path blocking efficiency by a ball valve, A variable displacement type control valve capable of increasing the opening inclination angle of a swash plate when the control room pressure decreases while preventing the inflow or outflow of refrigerant gas and increasing the discharge capacity of refrigerant gas through the increase in the opening inclination angle of the swash plate and an assembly method thereof will be.

In general, a cooling circuit of an air conditioner for a vehicle includes a condenser, an expansion valve, an evaporator, and a compressor. At this time, the compressor compresses refrigerant gas drawn from the evaporator and discharges the compressed gas toward the condenser. And, the evaporator serves to perform heat exchange between the refrigerant flowing through the cooling circuit and the air in the vehicle interior.

Since the amount of heat of the air passing around the evaporator is transferred to the refrigerant flowing through the evaporator according to the size of the heat load or cooling load, the refrigerant gas pressure at the outlet or downstream of the evaporator reflects the size of the cooling load.

Since the compressor used in this cooling circuit uses engine power whose rotational speed changes according to the driving state, it is impossible to control the discharge capacity through rotational speed control. For this purpose, variable displacement compressors that vary the discharge capacity of the refrigerant have been widely applied.

And, in the variable displacement control valve used in the compressor, the bellows inside the bellows casing communicating with the suction chamber of the compressor expands or contracts according to the pressure in the suction chamber. This moves the valve rod in contact with the upper surface of the bellows up and down, and the valve rod moves the ball valve located on the upper end up and down again to control the supply amount of the refrigerant gas.

However, the conventional variable displacement control valve did not efficiently control the intake and discharge amounts of the high-pressure gas or liquid refrigerant through the control room pressure check, and thus the operation performance of the variable swash plate type compressor did not obtain satisfactory results. .

For example, in the variable displacement control valve disclosed in Patent Publication No. 10-2004-0042817, a balance spring (compression coil spring) is added to adjust from an external component, as well as a sealing O-ring for preventing leakage of the valve after setting the control valve As this is added, since it is finished with epoxy for fixing and sealing the setting adjustment cap, there is a disadvantage in that cracks occur in the bellows welded part when setting the control valve while rotating the bellows welded product, and the number of parts to configure the control valve ( Example; 17), there was a problem that the manufacturing cost also increased as the number increased.

Publication No. 10-2004-0042817 (published on May 20, 2004)

Registered Patent Publication No. 10-0443158 (Announcement date 2004.08.04.)

Registered Patent Publication No. 10-0793209 (published on 2008.01.10.)

Registered Patent Publication No. 10-0890207 (published on March 25, 2009)

Registered Patent Publication No. 10-1462418 (Announcement Date 2014.11.11.)

The problem to be solved by the present invention is to efficiently control the suction and discharge amounts of high-pressure gas or liquid refrigerant through the control room pressure check, but prevent the inflow or outflow of refrigerant gas into the control room by increasing the efficiency of blocking the flow path by the ball valve. while increasing the opening inclination angle of the swash plate when the pressure in the control room decreases, and increasing the discharge capacity of refrigerant gas through the increase in the opening inclination angle of the swash plate, the operating performance of the variable swash plate type compressor and furthermore, the preparation operation time of the air conditioner can be shortened. It is intended to provide a variable displacement control valve and an assembly method thereof.

Another problem to be solved by the present invention is to make it possible to assemble a control valve using a simple number of parts (eg, 14) without additional parts while setting using the ball spring fixing cap, which is an internal part. , Simplification of control valve setting and quality improvement using an adapter to ensure quality (hysteresis), and fixing the bellows spring using a T-shaped fixing cap inside the bellows instead of the setting adjustment cap used in the prior registered patent It is an object of the present invention to provide a variable displacement control valve and an assembly method thereof to secure price competitiveness through parts simplification as well as stably operating the control valve after welding and assembling while welding.

A variable displacement control valve, which is a means for solving the problems of the present invention, has a first port communicating with a suction chamber of a compressor and having a first port on which the suction pressure (Ps) acts, and adjusts the suction pressure (Ps). ) bellows housing in which a bellows that expands or contracts according to a change and a first pressure chamber in which a pressure reducing spring is accommodated is provided; A holder housing that is stacked and coupled to maintain a predetermined gap with the bellows inside the bellows housing, and is provided with a second port communicating with the control room of the compressor and receiving control room pressure and a first flow path opened and closed by a ball valve; It is made of a tubular structure having the same cross-sectional area up and down and is screwed to the holder housing so that the amount of fastening is adjusted so that the refrigerant gas is introduced or discharged by controlling the driving compression amount of the compressor, and is communicated with the discharge chamber of the compressor to increase the discharge pressure ( A third port where Pd) acts, and a second pressure chamber in which a ball spring having a constant mounting tension is accommodated to adjust the discharge pressure (Pd) according to the opening and closing of the ball valve to adjust the discharge pressure (Pd). a ball spring fixing cap; And, while passing through the holder housing, one end and the other end are disposed in the first pressure chamber and the second pressure chamber, respectively, and a first direction or a second direction opposite to the first direction depending on whether the bellows is expanded or contracted. an operating rod that moves straight to; A first accommodating groove for accommodating the blocked end elevation of the bellows is formed on an inner surface of the bellows housing, while the bellows contracts in one direction inside the bellows housing on the inner bottom surface of the first accommodating groove. In order to increase the blocking efficiency of the first flow path by the ball valve, a compressed air chamber into which compressed air generated when the raised end of the blocked end of the bellows comes into close contact with the inner surface of the bellows housing, and the compressed air chamber To form a compressed air discharge passage through which the introduced compressed air is discharged to the outside of the bellows housing .

In addition, the bellows has the blocking ridge formed in the form of a container in which the lower surface of the side pleats is closed, and the lower expansion part of the fixed cap constituting the T-shaped structure is accommodated in close contact with the blocking ridge, and the side pleats The outward wing at the upper end of the part is welded and fixed to the bottom surface of the upper tube.

In addition, the compressed air chamber formed on the inner surface of the first accommodating groove is formed in a V-shaped cross section at the central portion of the inner bottom surface of the first accommodating groove, and the compressed air discharge passage is formed in the central portion of the bottom surface of the first accommodating groove. It is formed in a V-shaped cross section starting from the compressed air chamber located there and continuing to the inner wall of the side of the first receiving groove to be connected to the first pressure chamber of the bellows housing.

In addition, the upper tube is coupled to the open other end of the bellows and has a second receiving groove of a cylindrical structure drawn into the bellows, and the second receiving groove controls the operating rod when the bellows expands or contracts. An adapter having a cylindrical structure for linear movement in one direction or a second direction is seated.

In addition, a seating groove in which one end of the operating rod is seated is formed in the adapter.

In addition, the third port of the ball spring fixing cap is coupled with a filter cap for preventing the inflow of foreign substances.

In addition, at least one or more O-rings are coupled to outer circumferential surfaces of the bellows housing and the holder housing.

According to another aspect, in the method of assembling a variable displacement control valve of the present invention, after the T-shaped fixed cap and the pressure-reducing spring supported by the T-shaped structure are sequentially put into the blocked end of the bellows, the open other end of the bellows A first step of assembling an adapter having a seating groove as a cylindrical structure into the second receiving groove while coupling an upper tube having a second receiving groove of a cylindrical structure to the upper tube; From the first process, the bellows in which the fixing cap and upper tube, the pressure-reducing spring, and the adapter are assembled are communicated with the suction chamber of the compressor to have a first port on which the suction pressure (Ps) acts. a second step of press-pressing and assembling the holder housing having a second port at the front end of the first pressure chamber of the bellows housing after putting it into the pressure chamber so that a primary setting of a control point is performed; After the operation rod, ball valve, and ball spring are sequentially introduced into the holder housing assembled by press pressing in the bellows housing from the second step, a tubular structure having the same cross-sectional area up and down on the opening side of the holder housing By finely adjusting and assembling the ball spring fixing cap made of a screw fastening method, the first flow path in the holder housing is opened and closed by the ball valve, and the discharge pressure (Pd) according to the opening and closing of the ball valve is in the second pressure chamber. A third step of making a secondary setting of a control point to open and close the third port of the ball spring fixing cap by adjusting ); a fourth process of assembling an O-ring to the outer circumferential surfaces of the bellows housing and the holder housing, which are assembled while the secondary setting of the control point is completed by the third process, and then inspecting performance; And, in the assembly structure passing the performance test from the fourth process, the ball spring fixing cap having the same cross-sectional area as the top and bottom of the holder housing and having a tubular structure is caulked and sealed, and then the ball spring fixing cap is caulked. a fifth step of assembling a filter cap to the holder housing; will proceed with

As such, the variable displacement control valve of the present invention utilizes a ball spring fixing cap, which is an internal part, to set the control valve, and to assemble the control valve using simple parts without additional parts.

The present invention is also configured to secure the bellows spring using a T-shaped fixing cap inside the bellows instead of a setting adjustment cap while ensuring quality (hysteresis) through the use of an adapter, through which the control valve is stably welded and assembled is to make it work.

In addition, the present invention efficiently controls the intake and discharge amounts of the high-pressure gas or liquid refrigerant through the control room pressure check, while preventing the inflow or outflow of refrigerant gas into the control room by increasing the flow path blocking efficiency by the ball valve. At the time of this descent, the opening inclination angle of the swash plate is increased, and the discharge capacity of refrigerant gas is increased through the increase in the opening inclination angle of the swash plate, thereby reducing the operating performance of the variable swash plate compressor and furthermore, the preparation operation time of the air conditioner. , It is possible to expect the effect of securing price and quality competitiveness through localization of control valves through parts simplification (eg 14).

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is an exploded perspective view showing the structure of a variable displacement control valve according to an embodiment of the present invention.
2 is a partially enlarged perspective view showing a coupling structure between a bellows housing and a bellows according to an embodiment of the present invention;
Figure 3 is a cutaway perspective view showing a state in which the bellows are inflated according to an embodiment of the present invention.
Figure 4 is a schematic cross-sectional view showing a bellows in an expanded state in an embodiment of the present invention.
5 is a cutaway perspective view showing a contracted state of the bellows according to an embodiment of the present invention.
Figure 6 is a schematic cross-sectional view showing a contracted state of the bellows in an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing the structure of a variable displacement control valve according to an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view showing a coupling structure between a bellows housing and bellows according to an embodiment of the present invention, and FIG. 3 is an enlarged perspective view of the present invention. 4 is a schematic cross-sectional view showing an expanded state of the bellows as an embodiment of the present invention, and FIG. 5 shows a state where the bellows are contracted as an embodiment of the present invention. 6 is a schematic cross-sectional view showing a contracted state of the bellows in an embodiment of the present invention.

1 to 6, the variable displacement control valve according to an embodiment of the present invention includes a bellows housing 10, a holder housing 20, a ball spring fixing cap 30, a bellows 40, It may include an operating rod 50, a ball valve 60, a ball spring 70, a filter cap 80, and an O-ring 90.

The bellows housing 10 may be provided with a first port 11 communicating with the suction chamber of the compressor and acting on the suction pressure Ps, and a first pressure chamber 12 for adjusting the suction pressure Ps. There is.

At this time, a first accommodating groove 13 may be formed on an inner surface of the bellows housing 10, and the blocking protrusion 41 of the bellows 40 may be accommodated in the first accommodating groove 13. In the first pressure chamber 12, the bellows 40 that expands or contracts according to the change in the suction pressure Ps and the pressure reducing spring 42 described later can be accommodated.

On the other hand, in the first receiving groove 13, the blocking ridge 41 of the bellows 40 is in close contact with the inner surface of the bellows housing 10, and the ball valve 60 provides a first flow path (to be described later) 22), the compressed air chamber 13a and the compressed air discharge passage 13b may be formed to increase the blocking efficiency.

That is, the compressed air chamber 13a is formed to form a V-shaped cross section at the center of the bottom surface of the first accommodating groove 13, and the compressed air discharge passage 13b is formed of the first accommodating groove 13. It is formed while forming a V-shaped cross section at the center of the bottom surface, and the compressed air chamber 13a and the compressed air discharge passage 13b start from the compressed air chamber 13a and the side of the first receiving groove 13 It is connected to the inner wall and can be connected to the first pressure chamber 12 of the bellows housing 10.

Accordingly, when the bellows 40 is contracted, the blocked one end ridge 41 of the bellows 40 and one surface of the bellows housing 20 are in close contact with each other without a gap, and the control by the ball valve 60 The blocking efficiency of one flow path 22 can be improved.

The holder housing 20 is inserted into the bellows housing 10, and communicates with the control room (crank room) of the compressor to have a second port 21 and a first flow path 22 in which the control room pressure Pc acts. ) can have.

The ball spring fixing cap 30 has a tubular structure having the same cross-sectional area up and down, and is screwed to the holder housing 20 so that the amount of fastening is adjusted so that the refrigerant gas is introduced or discharged through the control of the driving compression amount of the compressor. , It has a third port 31 communicating with the discharge chamber of the compressor and acting on the discharge pressure (Pd), and a second pressure chamber 32 for adjusting the discharge pressure (Pd) is provided.

At this time, the ball spring fixing cap 30 is screwed to the holder housing 20, which is to adjust the mounting tension of the ball spring 70 according to the screwing of the ball spring fixing cap 30. Accordingly, the opening/closing state of the first flow path 22 in the holder housing 20 by the ball valve 60 can be finely adjusted, and the discharge pressure from the fine adjustment of the opening/closing state of the first flow path 22 Fine adjustment of (Pd) becomes possible.

The bellows 40 expands or contracts according to the change in the suction pressure Ps in the first pressure chamber 12 while being configured inside the first pressure chamber 12, and one end is the blocking ridge 41 is formed and the other end is open, which is when the suction pressure (Ps) acting on the first port (11) is lower than the set value, the discharge pressure (Pd) acts on the third port (31) and the first While supplying refrigerant gas to the control chamber through the passage 22 and the second port 21, the pressure in the control chamber is increased to reduce the opening angle of the swash plate inclination angle and expand to reduce the refrigerant discharge capacity, while the first When the suction pressure (Ps) acting on the port (11) is equal to or higher than the set value, the third port (31), the first flow path (22) and the second port (21) act on the discharge pressure (Pd). ) to block the supply of refrigerant gas to the control chamber while lowering the pressure in the control chamber to increase the opening angle of the inclination angle of the swash plate and to increase the refrigerant discharge capacity.

Here, the bellows 40 has a container shape in which the lower surface of the side corrugation part 40a is sealed, and has the blocking ridge 41, and the blocking ridge 41 has a fixed cap 43 forming a T-shaped structure. ) is accommodated in a state of being in close contact with the lower extension part 43a, and the upper outward wing part 40b of the side corrugation part 40a can be welded and fixed to the lower surface of the upper tube 44.

On the other hand, a pressure reducing spring 42 is coupled to the bellows 40, and the pressure reducing spring 42 reduces the pressure of the bellows 40 when the suction pressure Ps acting on the first port 11 is lower than a set value. It has a certain mounting tension to expand it.

In addition, the fixing cap 43, which is a T-shaped structure, is coupled to the inside of the blocking raised portion 41 of the bellows 40, and the outward wing portion 40b, which is the other open end of the bellows 40, While the upper tube 44 having the second accommodating groove 44a constituting the cylindrical structure is welded and coupled, the adapter 45 is seated in the second accommodating groove 44a, while the adapter 45 is attached to the bellows ( 40) is configured to linearly move the operating rod 50 in the first direction P1 or in the second direction P2 opposite to the first direction P1 when it expands or contracts.

Here, a seating groove 45a in which one end of the operating rod 50 is seated may be formed in the adapter 45 .

The operating rod 50 is linearly moved in a first direction P1 or linearly moved in a second direction P2 opposite to the first direction P1 according to whether the bellows 40 is expanded or contracted. As configured, one end and the other end can be disposed in the first pressure chamber 12 and the second pressure chamber 32, respectively, while penetrating the holder housing 20.

The ball valve 60 is seated in the first flow path 22 in the holder housing 20, and is configured to open and close the first flow path 22 according to the linear movement direction of the operating rod 50. will be.

That is, the ball valve 60 presses the ball spring 70 when the operating rod 50 linearly moves in the first direction P1 and the first passage 22 communicates with the second port 21. ) is opened, and when the operating rod 40 moves linearly in the second direction P2, the first passage 22 communicating with the second port 21 by the mounting tension of the ball spring 70 It is configured to close.

The ball spring 70 is formed in the second pressure chamber 32 in the ball spring fixing cap 30, and has a constant mounting tension to adjust the discharge pressure Pd according to the opening and closing of the ball valve 60. it has

The filter cap 80 is configured to prevent foreign matter from flowing into the third port 31 of the ball spring fixing cap 30.

At least one or more O-rings 90 are coupled to outer circumferential surfaces of the bellows housing 10 and the holder housing 20 .

That is, the O-ring 90 is inserted into the first pressure chamber 12 through the first port 11 of the bellows housing 10 so that the control valve is tightly fitted to the compressor so that the refrigerant gas pressure of the compressor remains intact. Sealing action so that the refrigerant gas pressure in the compressor is transferred to the second pressure chamber 32 of the ball spring fixing cap 30 through the second port 21 of the holder housing 20 intactly will be.

Meanwhile, looking at the assembly process of the variable displacement control valve configured as described above, first, the lower expansion part 43a of the T-shaped fixed cap 43 is seated on the blocking ridge 41 of the bellows 40. On the other hand, after sequentially inputting the pressure-reducing spring 42 supported by the fixing cap 43, the upper tube having a second receiving groove 44a of a cylindrical structure at the other open end of the bellows 40 ( 44), the adapter 45 having a seating groove 45a in a cylindrical structure is assembled to the second receiving groove 44a.

As a next process, the bellows 40, in which the fixing cap 43, the upper tubes 43 and 44, the pressure reducing spring 42, and the adapter 45 are assembled, is communicated with the suction chamber of the compressor to generate suction pressure ( Ps) is put into the first pressure chamber 12 in the bellows housing 10 having the first port 11 acting, and then placed at the front end side of the first pressure chamber 12 of the bellows housing 10. The primary setting of the control point is performed while the holder housing 20 having the second port 21 is pressed and assembled.

As the next process, after sequentially introducing the operating rod 50, the ball valve 60 and the ball spring 70 into the holder housing 20 assembled to the bellows housing 10 by press pressing, The first flow path ( 22) is opened and closed by the ball valve 60, and in the second pressure chamber 32, the discharge pressure Pd according to the opening and closing of the ball valve 60 is adjusted so that the third pressure of the ball spring fixing cap 30 This is to enable the secondary setting of the control point to be made while allowing the port 31 to be opened and closed.

As the next process, after assembling the O-ring 90 on the outer circumferential surfaces of the bellows housing 10 and the holder housing 20, performance is tested.

As a next process, in the assembly structure that passes the performance test, the ball spring fixing cap 30 having the same cross-sectional area as the top and bottom of the holder housing 20 and having a tubular structure is caulked and sealed, and then the ball spring is fixed. When the filter cap 80 is assembled to the holder housing 20 in which the cap 30 is caulked, the variable displacement control valve can be completed as a single unit according to an embodiment of the present invention.

That is, Patent Publication No. 10-2004-0042817, a prior registered patent, press-fits and assembles a ball spring fixing cap while inserting a ball and a ball spring into the holder housing, and then press-fits and assembles the holder housing to the bellows housing to control the control point While setting , there is a structural problem inevitably causing deviation in the control point.

On the other hand, in the variable displacement control valve according to the embodiment of the present invention, the holder housing 20 is press-fitted into the bellows housing 10, and after the control point is first set, the holder housing 20 operates inside the holder housing 20. The rod 50, the ball valve 60, and the ball spring 70 are sequentially introduced, and then the ball spring fixing cap 30 having the same cross-sectional area up and down on the opening side of the holder housing 20 and having a tubular structure The ball valve 60 for opening and closing the first flow path 22 in the holder housing 20, and the second pressure chamber by the ball valve 60 Since the control point for the discharge pressure (Pd) in (32) and the opening and closing of the third port (31) is set secondarily, the control point deviation like the prior registration patent does not occur, that is, the deviation up is the control point that can be set.

As described above, the variable displacement control valve according to the embodiment of the present invention, which is assembled while setting the first and second control points, is first formed in the bellows housing 10, as shown in FIGS. 1 to 6. 1 port 11 is in communication with the suction chamber of the compressor so that the suction pressure (Ps) acts on the first pressure chamber (12).

At this time, as shown in the accompanying FIGS. 3 and 4, when the suction pressure (Ps) is lower than the pressure of the first pressure chamber 12 in the sealed bellows housing 10, the bellows housing 10 The bellows 40 accommodated in the first pressure chamber 12 expands.

Then, the adapter 45 accommodated in the second accommodating groove 44 of the upper tube 44 moves linearly from the expansion action of the bellows 40, and the adapter 45 is once seated in the seating groove 45a of the adapter 45. The seated operating rod 50 moves linearly to push the ball valve 60 seated in the first passage 22 of the holder housing 20 .

Here, since the opening and closing state of the ball valve 60 can be finely adjusted by the ball spring 70 whose mounting tension is controlled by the ball spring fixing cap 30 screwed to the holder housing 20, the ball Since the first passage 22 blocked by the valve 60 is opened through fine adjustment, the third port 31 of the ball spring fixing cap 30 communicates with the discharge chamber of the compressor and the discharge pressure Pd acts thereon. ) and the second port 21 of the holder housing 20, which is in communication with the control room of the compressor and where the control room pressure Pc acts, communicates with each other and allows refrigerant gas to flow in and out, thereby increasing the control room pressure. The opening inclination angle decreases, and the discharge capacity of the refrigerant gas decreases due to the opening inclination angle reduction of the swash plate.

On the other hand, as shown in the attached FIGS. 5 and 6, when the suction pressure (Ps) is equal to or higher than the pressure of the first pressure chamber 12 in the sealed bellows housing 10, the bellows housing 10 The bellows 40 accommodated in the first pressure chamber 12 is contracted by the mounting tension of the pressure reducing spring 42 .

Then, the adapter 45 seated in the second accommodating groove 44a of the upper tube 44 is linearly moved due to the contraction action of the bellows 40, and once in the seating groove 45a of the adapter 45 The seated operating rod 50 moves linearly, and accordingly, the ball valve 60, which opened the first passage 22 of the holder housing 20, is moved again by the mounting tension of the ball spring 70. 1 to block the flow path 22.

That is, when the blocking protrusion 41 of the bellows 40 is accommodated in the first receiving groove 13 formed on the inner surface of the bellows housing 10, the Compressed air is collected in the compressed air chamber 13a forming a V-shaped structure when the bellows 40 contracts, and the compressed air returns to the first pressure through the compressed air discharge passage 13a forming a V-shaped structure. While being discharged to the seal 12, the blocking ridge 41 of the bellows 40 may be in close contact with the inner surface of the bellows housing 10, and thus the ball valve 60 removes the first flow path. (22) is that the blocking efficiency can be increased.

Then, when the first flow path 22 is effectively blocked by the ball valve 70, the third port 31 of the ball spring fixing cap 30 and the second port 21 of the holder housing 20 ) are shielded from each other so that the inflow and outflow of refrigerant gas can be prevented.

That is, the ball valve 60 is moved to the first flow path ( 22) is blocked, the inflow and outflow of refrigerant gas into the control room is blocked, and as a result, the pressure in the control room decreases and the opening inclination angle of the swash plate increases, and the discharge capacity of refrigerant gas from the increase in the opening inclination angle of the swash plate it will increase

In other words, the variable displacement control valve according to an embodiment of the present invention drives the compressor when the bellows 40 is contracted as shown in FIGS. 5 and 6 attached due to the internal flat pressure (eg, 5 bar) of the compressor. The suction pressure (Ps) can be reduced from about 5 bar to about 1 bar, and accordingly, as shown in FIGS. 3 and 4, the expansion of the bellows 40 and the linear movement of the operating rod 50, and the ball valve ( 60) is opened, and the process of securing the flow path of the discharge pressure (Pd)→control chamber pressure (Pc) is repeated, and the compression amount of the compressor can be controlled.

In the above, the technical idea of the variable displacement control valve and its assembly method of the present invention has been described together with the accompanying drawings, but this is an exemplary description of the most preferred embodiment of the present invention, but does not limit the present invention.

Therefore, the present invention is not limited to the specific embodiments described above, and various modifications can be implemented by anyone having ordinary knowledge in the art to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Of course, such changes are within the scope of the claims.

10; bellows housing 11; 1st port
12; a first pressure chamber 13; 1st receiving groove
13a; compressed air chamber 13b; Compressed air discharge path
20; holder housing 21; 2nd port
22; 1 Euro 30; ball spring fixing cap
31; third port 32; 2nd pressure chamber
40; bellows 40a; side crease
40b; Outward wing portion 41; blocking ridge
42; pressure reducing spring 43; fixed cap
43a; lower extension 44; upper tube
44a; second accommodating groove 45; adapter
45a; seating groove 50; working rod
60; ball valve 70; ball spring
80; filter cap 90; o-ring

Claims (8)

Having a first port communicating with the suction chamber of the compressor and having a first port through which the suction pressure (Ps) acts, and adjusting the suction pressure (Ps), the bellows and the pressure reducing spring that expand or contract according to the change in the suction pressure (Ps) a bellows housing provided with a first pressure chamber to be accommodated therein;
A holder housing that is stacked and coupled to maintain a predetermined gap with the bellows inside the bellows housing, and is provided with a second port communicating with the control room of the compressor and receiving control room pressure and a first flow path opened and closed by a ball valve;
It is made of a tubular structure having the same cross-sectional area up and down and is screwed to the holder housing so that the amount of fastening is adjusted so that the refrigerant gas is introduced or discharged by controlling the driving compression amount of the compressor, and is communicated with the discharge chamber of the compressor to increase the discharge pressure ( A third port where Pd) acts, and a second pressure chamber in which a ball spring having a constant mounting tension is accommodated to adjust the discharge pressure (Pd) according to the opening and closing of the ball valve to adjust the discharge pressure (Pd). a ball spring fixing cap; and,
While penetrating the holder housing, one end and the other end are disposed in the first pressure chamber and the second pressure chamber, respectively, and a straight line in a first direction or a second direction opposite to the first direction depending on whether the bellows is expanded or contracted. moving working rod; including,
A first accommodating groove accommodating the blocked end elevation of the bellows is formed on an inner surface of the bellows housing, while a ball valve when the bellows is contracted in one direction inside the bellows housing is formed on the inner bottom surface of the first accommodating groove. In order to increase the blocking efficiency of the first flow path by the compressed air chamber into which the compressed air generated when the raised end of the blocked end of the bellows comes into close contact with the inner surface of the bellows housing, and the compressed air introduced into the compressed air chamber Forming a compressed air discharge passage for discharging air to the outside of the bellows housing ,
The compressed air chamber formed on the inner surface of the first accommodating groove is formed in a V-shaped cross section at the central portion of the inner bottom surface of the first accommodating groove, and the compressed air discharge passage is located in the central portion of the bottom surface of the first accommodating groove. The variable displacement type control valve, characterized in that formed in a V-shaped cross section starting from the compressed air chamber and continuing to the inner wall of the side of the first receiving groove to the first pressure chamber of the bellows housing. According to claim 1,
The bellows,
The lower surface of the side pleats has a raised portion at one end made in the form of a sealed container,
The one end of the ridge is accommodated in a state in which the lower extension of the fixing cap constituting the T-shaped structure is in close contact,
The variable displacement control valve having a one-side attachment structure in which the outer wing portion at the upper end of the side corrugation portion is welded and fixed to the bottom surface of the upper tube. delete According to claim 2,
The upper tube is coupled to the open other end of the bellows and has a second receiving groove of a cylindrical structure drawn into the bellows,
A variable capacity type control valve, characterized in that, an adapter having a cylindrical structure for linearly moving the actuating rod in a first direction or a second direction when the bellows expands or contracts is seated in the second accommodating groove. According to claim 4,
A variable displacement control valve, characterized in that the adapter is formed with a seating groove in which one end of the operating rod is seated. According to claim 1,
A variable displacement control valve, characterized in that the third port of the ball spring fixing cap is coupled with a filter cap for preventing the inflow of foreign substances. According to claim 1,
A variable displacement control valve, characterized in that at least one or more O-rings are coupled to the outer circumferential surfaces of the bellows housing and the holder housing. delete