WO2013109005A1 - Electronic control valve for variable capacity compressor - Google Patents

Description

Electronic control valve of variable displacement compressor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control valve of a variable displacement compressor, and in particular, to improve the electronic control valve of a variable displacement compressor, which is not influenced by the fluid temperature, thereby miniaturizing and reducing power consumption of the device itself, and having good pressure linearity and hysteresis. An apparatus for narrowing bandwidth and performing precise control, and more particularly, relates to an apparatus capable of performing an accurate operation, increasing the marketability, and in particular, enabling higher precision control.

In general, a compressor is provided in an air conditioner of a vehicle, and in recent years, a variable capacity compressor capable of varying a discharge capacity by controlling an inclination angle of a swash plate is widely applied.

The variable capacity compressor for an automotive air conditioner selectively receives power from the engine according to the interruption of the electronic clutch to suck the refrigerant gas from the evaporator, compress it through the linear reciprocating motion of the piston, and discharge it to the condenser. do.

1 is a view showing a typical variable displacement compressor, in which a typical variable displacement compressor has a cylinder block (1) having a plurality of axial cylinder bores (1a) therein, and the cylinder block (as shown in FIG. 1). The front housing 2, which is mounted at the front of 1) and forms a closed crank chamber 2a, is mounted under the valve plate 3 at the rear of the cylinder block 1, and the refrigerant suction chamber 4a. ) And a rear housing (4) having a discharge chamber (4b), a drive shaft (5) rotatably supported on the cylinder block (1) and the front housing (2), and inside the crank chamber (2a) The rotor 6 firmly mounted on the drive shaft 5 and the hinge mechanism 7 connected to the rotor 6 and the inclination angle may change in response to the pressure change of the crank chamber 2a. The swash plate 8 mounted on (5) and the outer circumference of the swash plate 8 are connected under the shoe 9 through the rotation of the swash plate 8. A plurality of pistons 10 compressing the refrigerant while reciprocating in the cylinder bore 1a according to the dynamic movement, and the refrigerant suction pressure and the crank chamber in the cylinder bore 1a so that the inclination angle of the swash plate 8 varies according to the heat load. The solenoid control valve 11 which changes the pressure difference with the gas pressure in (2a), and the compression coil spring installed between the rotor 6 and the swash plate 8 for the return to the initial position of the swash plate 8; (12) and the like.

In the general variable displacement compressor configured as described above, when the drive shaft 5 is rotated by the power of the engine, the swash plate 8 mounted to the drive shaft 5 to be capable of adjusting the inclination angle rotates together with the drive shaft 5, and then the front and rear directions, That is, the left and right swinging movement in the drawing, the plurality of pistons 10 connected to the outer circumference of the swash plate 8 in the cylinder bore (1a) of the cylinder block 1 by a distance proportional to the inclination angle of the swash plate (8) Reciprocating in.

As a result, the volume of the compression chamber in the cylinder bore 1a changes, and the suction, compression, and discharge of the refrigerant gas proceed in order by the volume change, and the high-pressure refrigerant gas having the capacity according to the inclination angle of the swash plate 8 is discharged. do.

At this time, the inclination angle of the swash plate 8 is varied in response to the pressure difference between the pressure in the crank chamber 2a and the suction pressure in the cylinder bore 1a by the solenoid control valve 11, thereby changing the amount of discharged refrigerant.

Development of a more precise control for the electronic control valve for controlling the variable displacement compressor as described above is being made continuously.

2 is a diagram illustrating an example of an electronic control valve of a conventional variable displacement compressor, and FIG. 3 is a diagram illustrating another example of an electronic control valve of a conventional variable displacement compressor.

In Figures 2 and 3 (a) is the ON operating state of the solenoid, (b) is the OFF operating state of the solenoid.

An example of the electronic control valve of the conventional variable displacement compressor shown in FIG. 2 was developed by T in Japan, and a relief valve 40 is provided therein to provide a crankcase pressure port 21 and a discharge pressure port 22. And a valve body 20 having a suction pressure port 23 formed therein, and a solenoid 30.

According to this configuration, the suction pressure port 23 communicates with the suction pressure port 23 from the crankcase pressure port 21 as shown in FIG. 2A during the ON operation of the solenoid 30, and the solenoid 30 2), the crankcase pressure port 21 communicates with the discharge pressure port 22 as shown in FIG.

One example of such an electronic control valve of a conventional variable displacement compressor has the advantage of low cost.

In addition, another example of the electronic control valve of the conventional variable displacement compressor shown in FIG. 3 was developed by E Company in Japan, and a bellows 70 is provided therein, and a crankcase pressure port 51 and a discharge pressure port ( 52, and the valve body 50, the suction pressure port 53 is formed, and the solenoid 60.

According to this configuration, the suction pressure port 53 is communicated from the crankcase pressure port 51 to the solenoid 60 as shown in FIG. 3 (a) when the solenoid 60 is turned on. 3), the crankcase pressure port 51 is in communication with the discharge pressure port 52, as shown in FIG.

Therefore, the electronic control valve of the conventional variable displacement compressor is capable of controlling the amount of refrigerant discharged by adjusting the inclination angle of the swash plate through the crankcase pressure through the above-described operation.

However, an example of an electronic control valve of a conventional variable displacement compressor developed by T in Japan has a disadvantage in that a large-capacity solenoid is required, linearity against pressure change, and hysteresis is large.

In addition, another example of an electronic control valve of a conventional variable displacement compressor developed by E Company in Japan is manufactured by welding the inside of the bellows to be vacuum, so that the production cost is high, and in particular, the shrinkage or expansion is caused by the temperature difference between the bellows and the outside. There is a concern that it may affect the correct opening and closing operation of the valve, and there is a technical problem such as increasing the capacity of the solenoid associated with the bellows spring constant to overcome the vacuum in the bellows.

The present invention is to solve the above problems, by improving the electronic control valve of the variable capacity compressor is not affected by the fluid temperature, the correct operation is made, and the miniaturization of the device itself and the reduction of power consumption to increase the marketability In particular, the present invention aims to provide an electronic control valve of a variable displacement compressor, which has good pressure linearity and narrows hysteresis bandwidth to enable higher precision control.

The first embodiment of the electronic control valve of the variable displacement compressor of the present invention, the electronic control valve is provided in the variable displacement compressor to control the pressure of the crankcase to vary the discharge capacity of the refrigerant; A body formed of a hollow body and having ports formed so that the crankcase pressure, the discharge pressure, and the suction pressure are respectively applied, one side of which is closed by a cap; A solenoid for closing the other side of the body and transferring the plunger and the push rod in one direction according to an electrical signal; A hollow guide fixed to an end of the push rod to communicate with the crankcase pressure port and its interior, and to close one of the passages connected to the crankcase pressure port from the discharge pressure port or from the suction pressure port; ; A hollow bellows elastically supporting the guide toward the solenoid side, the inside of which is in communication with the inside of the guide; And a check valve supported by the cap to close the interior of the body and the interior of the bellows.

And a second embodiment of the electronic control valve of the variable displacement compressor of the present invention, the electronic control valve is provided in the variable displacement compressor to control the pressure of the crankcase to vary the discharge capacity of the refrigerant; A body formed of a hollow body and having ports formed so that the crankcase pressure, the discharge pressure, and the suction pressure are respectively applied, one side of which is closed by a cap; A solenoid for closing the other side of the body and transferring the plunger and the push rod in one direction according to an electrical signal; A hollow guide connected to the distal end of the plunger so as to communicate with the suction pressure port therein and to selectively close a passage from the discharge pressure port to the crankcase pressure port; A hollow bellows elastically supporting the guide toward the solenoid side, the inside of which is in communication with the inside of the guide; And a check valve supported by the cap to close the interior of the body and the interior of the bellows.

In addition, a third embodiment of the electronic control valve of the variable displacement compressor of the present invention is provided with an electronic control valve provided in the variable displacement compressor to control the pressure of the crankcase to vary the discharge capacity of the refrigerant; A body formed of a hollow body, and having a port configured to act on the suction pressure, the discharge pressure, and the crankcase pressure, respectively, one side of which is closed by a cap; A solenoid which closes the other side of the body and transfers a push rod having a plunger and a part of the inside thereof formed in a hollow body in accordance with an electrical signal, each of which has a passage connecting the inside and the outside to one side; Any one of a passage fixed to the outer periphery of the push rod and connected to the crankcase pressure port from the discharge pressure port and a passage connected to the suction pressure port from the crankcase pressure port via the inside of the pushrod; A hollow guide for closing the door; A hollow bellows elastically supporting the guide toward the solenoid side and having the push rod passed therein; It is achieved by including a check valve supported by the cap to close the inside of the body and the inside of the push rod.

At this time, it is preferable that an elastic body is further provided on the inner circumference of the bellows.

Therefore, the pressure from the crankcase pressure port is transmitted to the suction pressure port according to the input of the electrical signal to the solenoid, and if there is no electrical signal, the pressure from the discharge pressure port to the crankcase pressure port. desirable.

In addition, the check valve is most preferably composed of a valve head and the coil spring of another type that can act as a ball or valve to serve as a relief valve.

The present invention as described above improves the electronic control valve of the variable displacement compressor is not affected by the fluid temperature, accurate operation is achieved, miniaturization of the device itself and reduction of power consumption to increase the marketability, especially the pressure linearity is good And it is an invention that can perform higher precision control by narrowing the hysteresis bandwidth.

1 shows a typical variable displacement compressor;

2 is a view showing an example of an electronic control valve of a conventional variable displacement compressor;

3 is a view showing another example of an electronic control valve of a conventional variable displacement compressor;

4 shows a first embodiment of an electronic control valve of a variable displacement compressor of the present invention;

Fig. 5 shows a second embodiment of the electronic control valve of the variable displacement compressor of the present invention;

Fig. 6 shows a third embodiment of the electronic control valve of the variable displacement compressor of the present invention.

<Description of the code>

ECV: Electronic Control Valve 100: Body

110: crankcase pressure port 120: discharge pressure port

130: suction pressure port 140: cap

150: decompression chamber 200: solenoid

210: plunger 220: push rod

221, 222: passage 230: core

240: restoring spring 250: coil

260: plate 270: frame

300: guide 310, 330: passage

320: holder 400: bellows

410: elastomer 420, 430: support

421: Euro 500: check valve

510: ball 520: coil spring

530: valve head 700: O-ring

4 is a diagram showing a first embodiment of an electronic control valve of a variable displacement compressor of the present invention, and FIG. 5 is a diagram showing a second embodiment of an electronic control valve of a variable displacement compressor of the present invention. Fig. 6 is a diagram showing a third embodiment of the electronic control valve of the variable displacement compressor of the present invention.

4 to 6, (a) shows the ON operating state of the solenoid, respectively, and (b) shows the OFF operating state of the solenoid, respectively.

Each embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>

First, the first embodiment of the electronic control valve of the variable displacement compressor of the present invention, as shown in Figure 4, is provided in the variable displacement compressor to control the pressure of the crankcase to change the discharge capacity of the refrigerant ( ECV); It is made of a hollow body, the ports 110, 120, 130 are formed so that the crankcase pressure (Pc), the discharge pressure (Pd), and the suction pressure (Ps), respectively, one side of the cap 140 A body 100 sealed by; A solenoid 200 for closing the other side of the body 100 and transferring the plunger 210 and the push rod 220 in one direction according to an electrical signal; The crankcase pressure port 110 is fixed to the end of the push rod 220 and communicates with the crankcase pressure port 110 and the inside thereof, from the discharge pressure port 120 or from the suction pressure port 130. Hollow guide 300 for closing any one of the passages connected to; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having an interior in communication with the interior of the guide 300; It is characterized in that the technical features include a check valve 500 which is supported by the cap 140 to close the inside of the body 100 and the bellows 400.

Basically, the present invention relates to an electronic control valve (ECV). The electronic control valve (ECV) is generally provided in a variable displacement compressor constituting an air conditioner for an automobile to control the pressure of the crankcase to adjust the inclination angle of the swash plate. The discharge capacity of the refrigerant is varied.

First, in the first embodiment of the electronically controlled valve of the variable displacement compressor of the present invention, the body 100 is a valve body made of a circular hollow body, and as shown in FIG. 4, the crank chamber of the variable displacement compressor from left to right. Ports 110, 120, 130 are formed through the inside and the outside so that the pressure Pc, the discharge pressure Pd, and the suction pressure Ps act in sequence.

In this case, reference numeral 700 denotes an O-ring for maintaining airtightness.

Each of the crankcase pressure ports 110, the discharge pressure ports 120, and the suction pressure ports 130 are formed in plural such as two or four at equal intervals on the circumference of the body 100.

And, one side of the body 100, that is, the left side in the drawing is sealed by the cap 140 of the separate, if the cap 140 and the body 100 to screw the coupling position of the cap 140 It is also possible to adjust the elastic support force therein through.

Inside the body 100, holes having different inner diameters are formed in multiple stages for each part, and in particular, the decompression chamber 150 in which the bellows 400 to be described below is located inside the crankcase pressure port 110. Is formed.

In addition, the other side of the body 100, that is, the solenoid 200 is provided on the right side of the drawing, so that the cap 140 and the solenoid 200 are sealed to the left and right of the body 100, respectively.

Here, the solenoid 200 is connected to the push rod 220 and move integrally, the plunger 210 made of a magnetic material, and the core 230 which is another magnetic body fixed and positioned on one side of the plunger 210, A restoring spring 240 provided between the plunger 210 and the core 230 and the plunger 210 and the core 230 are provided around the plunger 210 and the core 230 to generate a magnetic field by receiving an electrical signal from a separate controller (not shown). The coil 250 is formed, and the plunger 210, the core 230, and a plate 260 and a frame 270 accommodating the coil 240 are formed.

The solenoid 200 is a magnetic field is formed in accordance with the ON operation to move the plunger 210 and the push rod 220 to the left in the drawing as shown in Fig. 4 (a), the bellows ( 400 and the restoring spring 240, the plunger 210 and the push rod 220 is returned to the right side as shown in FIG.

In this way, the guide 300 is coupled to the end of the push rod 220 that moves in accordance with the application of the electrical signal.

The guide 300 is made of a hollow pipe, the left side in the drawing is formed with a passage 310 connecting the inside and outside of the crankcase pressure port 110 and the inside of the guide 300 is in communication, The right side of the figure is coupled to the end of the push rod 220.

At this time, the flow path is formed to allow the longitudinal flow of the refrigerant therebetween even when the guide 300 and the push rod 220 are coupled, for this purpose, the inner circumferential surface of the guide 300 and the push rod 220 If the holder 320 is formed between the outer peripheral surface of the manufacturing and assembly is easy.

In addition, the outer circumferential surface of the guide 300 is guided in the longitudinal direction in close contact with the inner circumferential surface of the body 100.

Accordingly, any one of passages connected to the crankcase pressure port 110 from the discharge pressure port 120 or from the suction pressure port 130 is selectively closed.

That is, when the guide 300 moves to the left side in the drawing as shown in FIG. 4A, the discharge pressure port 120 is closed, and the suction pressure port 130 is separated from the crankcase pressure port 110. Is communicated with each other, and when the guide 300 moves to the right side as shown in FIG. 4B, the suction pressure port 130 is closed, and the crankcase pressure port (from the discharge pressure port 120) 110) is in communication.

Therefore, in the present invention, the push rod 220 protrudes according to the input of the electrical signal to the solenoid 200 to transfer the pressure from the crankcase pressure port 110 to the suction pressure port 130, In the absence of an electrical signal, the push rod 220 may elastically return to transfer the pressure from the discharge pressure port 120 to the crankcase pressure port 110.

Next, in the decompression chamber 150 formed inside the crank chamber pressure port 110 of the body 100, a bellows 400 formed to be hollow with a thin thin metal material is positioned.

The bellows 400 is supported by the supports 420 and 430 provided at both ends thereof to maintain its elasticity. The support 420 provided on the left side of the bellows 400 has an outer circumferential surface of the body 100. In contact with the inner circumferential surface, a flow path 421 is formed therebetween to allow the refrigerant to flow in the longitudinal direction.

In addition, the support 430 provided on the right side of the bellows 400 is coupled to the left end of the guide 300 to elastically support the guide 300 toward the solenoid 200.

In particular, in the present invention, it is preferable that an elastic body 410 is additionally provided at the inner circumference of the bellows 400, and through this, the elastic body 410 together with the bellows 400 may guide the guide 300. It is preferable to supplement the force for elastically supporting the solenoid 200 side.

Finally, a check valve 500 for closing the inside of the decompression chamber 150 inside the body 100 and the bellows 400 is provided on the right side of the cap 140 closing the left side in the drawing of the body 100. ) Is provided.

The check valve 500 is composed of a ball 510 and a coil spring 520 to perform the function of a relief valve that is opened when excessive pressure is applied.

The operation of the first embodiment of the electronic control valve of the variable displacement compressor of the present invention configured as described above will be described.

First, as shown in (a) of FIG. 4, when an electrical signal is applied to the solenoid 200 from a separate control unit (not shown), the plunger 210 and the push rod of the solenoid 200 are operated. 220 is moved to the left in the drawing.

Accordingly, as the guide 300 connected to the end of the push rod 220 moves to the left side, the bellows 400 and the elastic body 410 elastically contract.

In addition, the discharge pressure port 120 is closed while the inner circumferential surface of the body 100 on which the discharge pressure port 120 is formed and the outer circumferential surface of the guide 300 come into contact with each other.

In addition, the suction pressure port 130 is opened while the right end of the guide 300 is spaced apart from the core 230 of the solenoid 200 in the body 100 where the suction pressure port 130 is formed. .

Thus, the discharge pressure port 120 is closed while the suction pressure port 130 is open.

As a result, the suction pressure port 130 communicates with the decompression chamber 150 of the body 100 and the inside of the guide 300 from the crank chamber pressure port 110 connected to the crank chamber of the variable displacement compressor. As a result, the refrigerant from the crankcase pressure port 110 is sent to the suction pressure port 130.

On the contrary, as shown in (b) of FIG. 4, when the electrical signal is not applied to the solenoid 200 and the OFF operation is performed, the plunger 210 and the push rod 220 of the solenoid 200 are restored. The spring 240 is moved to the right in the drawing.

Accordingly, as the guide 300 connected to the end of the push rod 220 is moved to the right side, the bellows 400 and the elastic body 410 elastically extend.

In addition, the discharge pressure port 120 is opened while the inner circumferential surface of the body 100 on which the discharge pressure port 120 is formed and the outer circumferential surface of the guide 300 are spaced apart.

In addition, the suction pressure port 130 is closed while the right end of the guide 300 is in contact with the core 230 of the solenoid 200 in the body 100 in which the suction pressure port 130 is formed. do.

Thus, the discharge pressure port 120 is opened while the suction pressure port 130 is closed.

As a result, the discharge pressure port 120 communicates with the discharge pressure port 120 through the decompression chamber 150 of the body 100 from the crank chamber pressure port 110 connected to the crank chamber of the variable displacement compressor. The refrigerant from is sent to the crankcase pressure port 110.

Through this operation, the first embodiment of the electronic control valve (ECV) of the variable displacement compressor of the present invention is to control the crankcase pressure of the variable displacement compressor to adjust the inclination angle of the swash plate to change the amount of refrigerant discharged.

Second Embodiment

Next, as shown in FIG. 5, the second embodiment of the electronic control valve of the variable displacement compressor of the present invention is provided in the variable displacement compressor to control the pressure of the crankcase to change the discharge capacity of the refrigerant ( ECV); It is made of a hollow body, the ports 110, 120, 130 are formed so that the crankcase pressure (Pc), the discharge pressure (Pd), and the suction pressure (Ps), respectively, one side of the cap 140 A body 100 sealed by; A solenoid 200 for closing the other side of the body 100 and transferring the plunger 210 and the push rod 220 in one direction according to an electrical signal; A hollow that is connected to the distal end of the plunger 210 to communicate with the suction pressure port 130 and the interior thereof, and selectively closes a passage connected from the discharge pressure port 120 to the crankcase pressure port 110. A guide 300; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having an interior in communication with the interior of the guide 300; It is characterized in that the technical features include a check valve 500 which is supported by the cap 140 to close the inside of the body 100 and the bellows 400.

In the second embodiment of the electronic control valve of the variable displacement compressor of the present invention, the overlapping detailed description of the same configuration as that of the first embodiment will be omitted.

In the second embodiment of the present invention, the solenoid 200 is a magnetic field is formed according to the ON operation so that the plunger 210 and the push rod 220 is moved to the right in the drawing as shown in Figure 5 (a) In response to the OFF operation, the plunger 210 and the push rod 220 are returned to the left side in the drawing by the restoring spring 240 as shown in FIG.

In this way, the guide 300 is coupled to the left end of the plunger 210 that moves in accordance with the application of the electrical signal.

The guide 300 is made of a hollow pipe, the right side in the drawing is formed with a passage 330 connecting the inside and the outside so that the suction pressure port 130 and the inside of the guide 300 is communicated, The upper right side is coupled to the end of the plunger 210.

In this case, the inside of the guide 300 and the suction pressure port 130 are only communicated through the passage 330.

In addition, the outer circumferential surface of the guide 300 is guided in the longitudinal direction in close contact with the inner circumferential surface of the body 100.

Accordingly, the passage connected to the crankcase pressure port 110 from the discharge pressure port 120 is selectively opened and closed.

That is, when the guide 300 moves to the right in the drawing as shown in FIG. 5A, the discharge pressure port 120 is closed, and the guide 300 is in the drawing as shown in FIG. 5B. The crankcase pressure port 110 communicates with the discharge pressure port 120 when moving to the left side.

Accordingly, in the present invention, the plunger 210 moves to the right side according to the input of the electrical signal to the solenoid 200 to transfer the pressure from the crankcase pressure port 110 to the suction pressure port 130. In the absence of an electrical signal, the push rod 220 may elastically return to the left side to transfer the pressure from the discharge pressure port 120 to the crankcase pressure port 110.

The operation of the second embodiment of the electronic control valve of the variable displacement compressor of the present invention configured as described above will be described.

First, as shown in (a) of FIG. 5, when an electrical signal is applied to the solenoid 200 from a separate control unit (not shown), the plunger 210 and the push rod of the solenoid 200 are operated. 220 is moved to the right in the drawing.

Accordingly, as the guide 300 connected to the end of the plunger 210 moves to the right, the bellows 400 and the elastic body 410 elastically extend.

In addition, the discharge pressure port 120 is closed while the inner circumferential surface of the body 100 on which the discharge pressure port 120 is formed and the outer circumferential surface of the guide 300 come into contact with each other.

In addition, the inside of the body 100 in which the suction pressure port 130 is formed maintains the suction pressure port 130 always open through the passage 330 of the guide 300.

As a result, the check valve from the crank chamber pressure port 110 connected to the crank chamber of the variable displacement compressor through the decompression chamber 150 of the body 100, and the check valve 500 and the guide 300. When the internal pressure difference 500 is greater than the force of the spring 520, the 500 is opened, and the suction pressure port 130 communicates with each other, so that the refrigerant from the crankcase pressure port 110 receives the suction pressure port ( 130 will be sent to.

On the contrary, as shown in (b) of FIG. 5, when the electrical signal is not applied to the solenoid 200 and the OFF operation is performed, the plunger 210 and the push rod 220 of the solenoid 200 are restored. The spring 240 is moved to the left side in the drawing.

Accordingly, as the guide 300 connected to the end of the plunger 210 moves to the left side, the bellows 400 and the elastic body 410 elastically contract.

In addition, the discharge pressure port 120 is opened while the inner circumferential surface of the body 100 on which the discharge pressure port 120 is formed and the outer circumferential surface of the guide 300 are spaced apart.

As a result, the discharge pressure port 120 communicates with the discharge pressure port 120 through the decompression chamber 150 of the body 100 from the crank chamber pressure port 110 connected to the crank chamber of the variable displacement compressor. The refrigerant from is sent to the crankcase pressure port 110.

Through this operation, the second embodiment of the electronic control valve (ECV) of the variable displacement compressor of the present invention is to control the crankcase pressure of the variable displacement compressor to adjust the inclination angle of the swash plate to change the discharge refrigerant amount.

Third Embodiment

Next, a third embodiment of the electronic control valve of the variable displacement compressor of the present invention, as shown in Figure 6, is provided in the variable displacement compressor to control the pressure of the crankcase to vary the discharge capacity of the refrigerant control valve In (ECV); It is made of a hollow body, the port 130, 120, 110 is formed so that the suction pressure (Ps), the discharge pressure (Pd), and the crankcase pressure (Pc), respectively, one side of the cap 140 A body 100 sealed by; Closing the other side of the body 100, the push rod 220 formed with a plunger 210 and a portion of the inside of the hollow body to connect the inside and the outside on both sides in accordance with the electrical signal is formed ) And the solenoid 200 for conveying in one direction; The inside of the push rod 220 from the crank chamber pressure port 110 and the passage connected to the crank chamber pressure port 110 from the discharge pressure port 120 is fixed to the stop outer peripheral surface of the push rod 220 A guide 300 for closing any one of the passages connected to the suction pressure port 130 via; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having the push rod 220 therein; It is characterized in that the technical features include a check valve 500 which is supported by the cap 140 to close the interior of the body and the push rod 220.

In the third embodiment of the electronic control valve of the variable displacement compressor of the present invention, the overlapping detailed description of the same configuration as that of the first embodiment will be omitted.

Inside the body 100, holes having different inner diameters are formed in multiple stages according to portions, and in particular, the bellows 400 to be described below is located inside the discharge pressure port 120, and the crankcase pressure The pressure reduction chamber 150 is formed inside the port 110.

In addition, the push rod 220 provided in the solenoid 200 has a hollow body on the left side of the drawing, and passages 221 and 222 are connected to both sides of the hollow body, respectively, on both sides of the hollow body. .

In addition, the guide 300 has a stepped cross section is fixed to the interruption of the push rod 220 is moved integrally with the push rod 220.

Accordingly, the passage 221 formed on the left side of the hollow body portion of the push rod 220 connects the inside of the push rod 220 and the suction pressure port 130 and is formed on the right side of the figure. The passage 222 connects the interior of the push rod 220 and the interior space of the guide 300.

Accordingly, the guide 300 passes through a passage connected from the discharge pressure port 120 to the crankcase pressure port 110 and the inside of the push rod 220 from the crankcase pressure port 110. One of the passages connected to the suction pressure port 130 is selectively closed.

That is, when the guide 300 moves to the left side as shown in FIG. 6A together with the push rod 220, the discharge pressure port 120 is closed, and the crankcase pressure port 110 is closed. The suction pressure port 130 communicates with the inside of the push rod 220 from the guide rod, and the guide 300 is integrated with the push rod 220 to the right in the drawing as shown in FIG. When moving, the crankcase pressure port 110 is directly communicated from the discharge pressure port 120.

Therefore, in the present invention, the guide 300 moves together with the push rod 220 in response to the input of an electrical signal to the solenoid 200 to push the pressure from the crankcase pressure port 110 to the push rod 220. The inside of the hollow portion of the through) to the suction pressure port 130, and if there is no electrical signal guide 300 with the push rod 220 is elastically returned from the discharge pressure port 120 It is desirable to transfer pressure directly to the crankcase pressure port 110.

Next, inside the discharge pressure port 120 of the body 100, a bellows 400 formed to be hollow with a thin thin metal material is positioned.

The bellows 400 is supported by the supports 420 and 430 provided at both ends thereof to maintain the shape of the bellows 400 elastically.

At this time, the support body 420 positioned on the left side of the drawing maintains a fixed state on the inner circumferential surface of the body 100, while the support body 430 positioned on the right side of the drawing is combined with the guide 300 and the guide. Elastic support 300 to the solenoid 200 side.

Finally, a check valve 500 for closing the inside of the body 100 and the inside of the push rod 220 is provided at the right side of the cap 140 closing the left side in the drawing of the body 100. .

At this time, the check valve 500 is preferably composed of a valve head 530 and the coil spring 520 of another type that can act as a valve to serve as a relief valve.

The operation of the third embodiment of the electronic control valve of the variable displacement compressor of the present invention configured as described above will be described.

First, as shown in FIG. 6A, when an electrical signal is applied to the solenoid 200 from a separate control unit (not shown), the plunger 210 and the push rod of the solenoid 200 are operated. 220 is moved to the left in the drawing.

Accordingly, the bellows 400 and the elastic body 410 elastically contract while the guide 300 fixed to the middle of the push rod 220 is also moved to the left side.

In addition, the discharge pressure port 120 is closed while the inner circumferential surface of the body 100 on which the crankcase pressure port 110 is formed and the left end of the guide 300 come into contact with each other.

In addition, inside the body 100 in which the crankcase pressure port 110 is formed, the right end of the guide 300 is spaced apart from the core 230 of the solenoid 200 while the crankcase pressure port 110 is Open.

Thus, the discharge pressure port 120 is closed while the crankcase pressure port 110 is opened.

As a result, the suction pressure port 130 communicates with the inside of the push rod 220 from the crankcase pressure port 110 connected to the crankcase of the variable displacement compressor, thereby allowing the crankcase pressure port 110 to Refrigerant is to be sent to the suction pressure port (130).

On the contrary, as shown in (b) of FIG. 6, when the electrical signal is not applied to the solenoid 200 and the OFF operation is performed, the plunger 210 and the push rod 220 of the solenoid 200 are bellowed. 400 and the restoring spring 240 is moved to the right in the drawing.

Accordingly, the bellows 400 and the elastic body 410 elastically extend as the guide 300 fixed to the middle outer peripheral surface of the push rod 220 moves to the right.

In addition, while the inner peripheral surface of the body 100, the crankcase pressure port 110 is formed and the left end of the guide 300 is spaced apart from the discharge pressure port 120, the crankcase pressure port 110 is in communication will be.

Then, the right end of the guide 300 is in contact with the core 230 of the solenoid 200, the flow path from the suction pressure port 130 to the crank chamber pressure port 110 is closed.

Thus, the discharge pressure port 120 is connected to the crankcase pressure port 110, while the flow path from the suction pressure port 130 to the crankcase pressure port 110 is closed.

As a result, the crankcase pressure port 110 connected to the crankcase of the variable displacement compressor and the discharge pressure port 120 communicate with each other, so that the refrigerant from the discharge pressure port 120 is transferred to the crankcase pressure port 110. Will be sent.

Through this operation, the third embodiment of the electronic control valve (ECV) of the variable displacement compressor of the present invention is to control the crankcase pressure of the variable displacement compressor to adjust the inclination angle of the swash plate to change the discharge refrigerant amount.

Therefore, according to the electronic control valve of the variable displacement compressor of the present invention, it is not necessary to configure the inside of the vacuum, so that it is possible to configure the solenoid 200 in a small size by greatly reducing the load of the bellows 400 and the power consumption is reduced In particular, since the coolant flows into and out of the bellows 400, it has an excellent advantage that there is little effect of shrinkage or expansion according to temperature.

In addition, by providing a separate check valve 500 to perform the function of the relief valve to improve response stability and prevent leakage due to high-speed vibration, in particular, because the solenoid 200 receives less force, the characteristics of linearity and hysteresis It also has the advantage that it is greatly improved to allow more precise control.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the scope of the present invention is not limited to the above drawings and embodiments.

Claims (6)

An electronic control valve (ECV) provided in a variable displacement compressor for controlling the pressure of the crankcase to vary the discharge capacity of the refrigerant; It is made of a hollow body, the ports 110, 120, 130 are formed so that the crankcase pressure (Pc), the discharge pressure (Pd), and the suction pressure (Ps), respectively, one side of the cap 140 A body 100 sealed by; A solenoid 200 for closing the other side of the body 100 and transferring the plunger 210 and the push rod 220 in one direction according to an electrical signal; The crankcase pressure port 110 is fixed to the end of the push rod 220 and communicates with the crankcase pressure port 110 and the inside thereof, from the discharge pressure port 120 or from the suction pressure port 130. Hollow guide 300 for closing any one of the passages connected to; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having an interior in communication with the interior of the guide 300; An electronic control valve of a variable displacement compressor, characterized in that it comprises a check valve (500) supported by the cap (140) to close the interior of the body (100) and the bellows (400). An electronic control valve (ECV) provided in a variable displacement compressor for controlling the pressure of the crankcase to vary the discharge capacity of the refrigerant; It is made of a hollow body, the ports 110, 120, 130 are formed so that the crankcase pressure (Pc), the discharge pressure (Pd), and the suction pressure (Ps), respectively, one side of the cap 140 A body 100 sealed by; A solenoid 200 for closing the other side of the body 100 and transferring the plunger 210 and the push rod 220 in one direction according to an electrical signal; A hollow that is connected to the distal end of the plunger 210 to communicate with the suction pressure port 130 and the interior thereof, and selectively closes a passage connected from the discharge pressure port 120 to the crankcase pressure port 110. A guide 300; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having an interior in communication with the interior of the guide 300; An electronic control valve of a variable displacement compressor, characterized in that it comprises a check valve (500) supported by the cap (140) to close the interior of the body (100) and the bellows (400). An electronic control valve (ECV) provided in a variable displacement compressor for controlling the pressure of the crankcase to vary the discharge capacity of the refrigerant; It is made of a hollow body, the port 130, 120, 110 is formed so that the suction pressure (Ps), the discharge pressure (Pd), and the crankcase pressure (Pc), respectively, one side of the cap 140 A body 100 sealed by; Closing the other side of the body 100, the push rod 220 formed with a plunger 210 and a portion of the inside of the hollow body to connect the inside and the outside on both sides in accordance with the electrical signal is formed ) And the solenoid 200 for conveying in one direction; The inside of the push rod 220 from the crank chamber pressure port 110 and the passage connected to the crank chamber pressure port 110 from the discharge pressure port 120 is fixed to the stop outer peripheral surface of the push rod 220 A guide 300 for closing any one of the passages connected to the suction pressure port 130 via; A hollow bellows 400 elastically supporting the guide 300 toward the solenoid 200 and having the push rod 220 therein; An electronic control valve of a variable displacement compressor, characterized in that it comprises a check valve (500) supported by the cap (140) to close the inside of the body (100) and the push rod (220). The electronic control valve according to any one of claims 1 to 3, wherein an elastic body (410) is further provided on an inner circumference of the bellows (400). According to any one of claims 1 to 3, according to the input of the electrical signal to the solenoid 200, the pressure from the crankcase pressure port 110 to the suction pressure port 130, the electrical The electronic control valve of a variable displacement compressor, characterized in that for transmitting no pressure from the discharge pressure port 120 to the crankcase pressure port (110). The relief valve according to any one of claims 1 to 3, wherein the check valve 500 comprises a ball 510 or another type of valve head 530 and a coil spring 520 that can act as a valve. Electronic control valve of a variable displacement compressor, characterized in that to perform the role of.

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