KR101057391B1 - Electrical control valve for variable capacity compressor - Google Patents

Abstract

PURPOSE: An electronic control valve of a variable-capacity compressor is provided to ensure maximum-variable capacity by drawing back pressure of a crank chamber in initial operation of an air conditioner. CONSTITUTION: An electronic control valve of a variable-capacity compressor comprises a housing(11), a valve body(13), a standby unit, a diaphragm assembly(16), a push rod(17), a plunger(18) and a valve rod(21). The housing comprises a coil(10). The valve body comprises a first path(12a) connected to a discharge chamber and a crank chamber and a second path(12c) and is coupled to the lower part of the housing. The standby unit is formed along the upper axial line of the housing and forms a diaphragm standby unit. The diaphragm assembly is located right below the standby unit and operates according to suction pressure of a decompression unit.

Description

Electronic Control Valve for Variable Capacity Compressor

The present invention relates to an electronic control valve of a variable displacement compressor, and more particularly, to a variable displacement compressor used in a vehicle air conditioner and the like to implement a maximum variable capacity at the initial stage of air conditioner operation to enable rapid cooling. It relates to an electronic control valve.

In general, a cooling circuit of a vehicle air conditioner includes a condenser, an expansion valve, an evaporator, and a compressor, in which the compressor compresses refrigerant gas sucked from the evaporator and discharges the compressed gas to the condenser side.

The evaporator performs heat exchange between the refrigerant flowing in the cooling circuit and the air in the vehicle.

Since the amount of air passing through the periphery of the evaporator is usually transferred to the refrigerant flowing through the evaporator, the refrigerant gas pressure at the outlet or downstream side of the evaporator reflects the magnitude of the cooling load.

Since the compressor used in the cooling circuit uses the power of the engine whose rotation speed changes according to the driving state, it is impossible to control the discharge capacity by adjusting the rotation speed. Therefore, in recent years, the compressor has a proper cooling capacity regardless of the engine rotation speed. In order to obtain a large number of variable displacement compressor that can vary the discharge capacity of the refrigerant is a trend is applied.

Such a variable displacement compressor is provided with a pressure control valve for controlling the amount of refrigerant discharge, wherein the pressure control valve is a mechanical pressure control valve driven by mechanical force and an electronic pressure control valve driven by electrical force.

Recently, an electronic pressure control valve is mainly used, and this is called an electronic control valve (ECV).

Usually, in the variable displacement compressor, the inclination of the swash plate is changed by the control of the electronic control valve, and the refrigerant discharge amount of the compressor is determined by the inclination of the swash plate.

Such an electronic control valve is a system of controlling the pressure Pc inside the crank chamber by controlling a portion of the refrigerant of the discharge pressure Pd discharged from the discharge chamber to be introduced into the crank chamber.

In the case of such an electronic control valve, a method of controlling the capacity by varying the pressure of the crankcase in accordance with the air conditioner operating conditions, that is, when the cooling load is large and the cooling load is small has been recently proposed.

For example, in order to obtain sufficient cooling effect from the beginning of the air conditioner operation, the back pressure of the crankcase is rapidly drawn back when the air conditioner is turned on, and the angle of the swash plate is set to the maximum angle. By implementing the capacity to cool more quickly, it is possible to shorten the warm-up time early in the air conditioner operation.

That is, an electronic control valve having a function of reducing the time for the warm wind when the air conditioner is turned on has been proposed.

For example, European Patent EP 1 650 435 A1 discloses a "control valve of a variable displacement compressor".

The control valve of the variable displacement compressor closes the valve when the cooling load is large and raises the plunger to open the flow path of the crank chamber and the suction chamber to draw back the pressure in the crank chamber to increase the swash plate angle, and shorten the initial warm-up time of the air conditioner operation. It consists of the way.

In addition, when the cooling load is small, the valve is opened and the plunger is lowered to close the flow paths of the crank chamber and the suction chamber and at the same time perform the same function as the existing control valve.

However, the control valve of the variable displacement compressor has the following disadvantages.

First, the overall size increases due to the large number of parts of the plunger member that opens and closes the flow path while operating in conjunction with the valve rod, and the overall number of peripheral parts such as seats and washers. There is a disadvantage in generating a lot of noise and vibration during operation.

Second, since the plunger member separated into two is made of magnetic material and is pulled up by magnetic force, it has a disadvantage in terms of manufacturability and manufacturing cost, such as not only a large number of processes such as heat treatment, but also many difficulties in processing. There are many disadvantages that cause a decrease in functionality or durability due to the characteristics that occur a lot.

Accordingly, the present invention has been made in view of the above, and the drawback of the pressure of the crankcase at the beginning of the air conditioner operation is improved by improving the structure of the valve rod, the operation relationship with the plunger side, and the flow path shape. By implementing a new type of variable capacity control method that ensures variable capacity, the warm-up time of initial air conditioner operation can be shortened, and in particular, the structure of the plunger member and the arrangement relationship with the peripheral parts can be simplified to reduce the number of parts. In addition, the overall size can be reduced, and a non-magnetic plunger seat, a plunger ring, a plunger pin, etc. are employed to provide an electronic control valve of a variable capacity compressor that can reduce costs and improve durability and functionality. Its purpose is to.

One example of the electronic control valve of the variable displacement compressor provided by the present invention to achieve the above object is to have a housing having a coil inside, a passage connected to the discharge type side and a crank chamber side, and a suction chamber side passage, respectively. A diaphragm assembly coupled to a lower portion, an atmospheric portion formed along an upper end axis of the housing to form a diaphragm atmospheric side, and a diaphragm assembly positioned under the atmospheric portion and operated according to suction pressure of the decompression portion formed at the lower portion; The push rod is positioned directly below the diaphragm assembly, and the center of the push rod is slidably coupled to the lower end of the push rod, and is disposed concentrically on the inside of the coil to move up and down by an electromagnetic force. Suction passage and crank through contact and disconnection with the top Plunger for opening and closing the measurement passage, and the discharge chamber side and the crank chamber side passage in the valve body can be opened and closed coupled to the lower end of the plunger, the passage along the flow path and radial direction through the central axis Characterized in that it comprises a valve rod capable of flowing the crank chamber side pressure to the suction chamber side through the outlet.

In addition, another example of the electronic control valve of the variable displacement compressor provided by the present invention in order to achieve the above object has a housing having a coil inside, a passage connected to the discharge type side and the crank chamber side, respectively, and a suction chamber side passage; A diaphragm assembly coupled to a lower portion of the housing, an atmospheric portion formed along an upper end axis of the housing to form a diaphragm atmospheric side, and a diaphragm assembly positioned under the atmospheric portion and operated according to suction pressure of the decompression portion formed at the lower portion thereof. And the discharge chamber side of the valve body using the valve seat of the lower end positioned inside the valve body, which is slidably positioned and operatively coupled to penetrate through the center axis of the plunger. And a push rod for opening and closing a crankcase side passage, and the push furnace The center is coupled to the inside of the coil concentrically arranged up and down by the electromagnetic force, and installed inside the valve body and the crank chamber side pressure while flowing to the suction chamber side while sliding with the lower end of the plunger. A relief valve, for example, a valve body which is open to the plunger side and the upper end thereof, and which is formed in the valve body to open and close the bypass flow passage communicating the crankcase passage and the suction chamber passage, and the valve body upwards. Characterized in that it comprises a relief valve consisting of a valve spring for supporting elasticity.

The electronic control valve of the variable displacement compressor provided by the present invention has the following advantages.

First, since the maximum variable capacity can be secured at the beginning of the air conditioner operation, there is an advantage of shortening the warm-up time at the beginning of the air conditioner operation.

Second, since the plunger consists of a single part, the number of parts can be reduced, and since the parts such as springs and spring seats can be removed around the plunger, the overall size of the solenoid control valve can be simplified. It can reduce the noise, simplify the structure, and reduce the noise and vibration.

Third, since the plunger sheet, the plunger ring, the plunger pin, etc. is made of a nonmagnetic material, it is easy to process and inexpensive to manufacture, and in particular, it is possible to reduce the amount of heat generated to improve durability and functionality.

1 is an exploded perspective view showing an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.
2 is a perspective view showing an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.
3 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.
4A and 4B are cross-sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.
5 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a second embodiment of the present invention.
6 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a third embodiment of the present invention.
7 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a fourth embodiment of the present invention.
8 is an exploded perspective view showing an electronic control valve of a variable displacement compressor according to a fifth embodiment of the present invention.
9A and 9B are cross-sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a fifth embodiment of the present invention.
10 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a sixth embodiment of the present invention.
11A and 11B are cross-sectional views illustrating an operating state of an electronic control valve of a variable displacement compressor according to a sixth embodiment of the present invention.
12 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a seventh embodiment of the present invention.
13A and 13B are cross-sectional views illustrating an operating state of an electronic control valve of a variable displacement compressor according to a seventh embodiment of the present invention.

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

The electronic control valve provided in the present invention is basically the same as the "control valve" disclosed in the applicant's registered patent No. 10-0947642 except for a part of the configuration and operation, for the redundant configuration and operation simply Let's explain.

1 to 3 are a perspective view and a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.

As shown in FIGS. 1 to 3, the electronic control valve includes a method of realizing a maximum variable capacity at the same time as operating the air conditioner to achieve rapid cooling, that is, a method of shortening the warm-up time at the beginning of the air conditioner operation. In addition, the structure of the surroundings including the plunger can be simplified and the size of the product can be reduced while minimizing the number of parts.

To this end, a cylindrical housing 11 having a lower housing body 31 is provided, and the coil 10 for generating electromagnetic force inside the housing 11 to operate the plunger 18 in a concentric manner. Combined, the coil 10 at this time is to be wrapped inside the bobbin (32).

The coil 10 is electrically connected to the outside and can be operated by the control of a controller (not shown).

The lower part of the housing 11 is provided with a valve body 13 for providing a fluid flow passage between the discharge chamber and the crank chamber, wherein the valve body 13 is the lower end of the housing body 31 in the housing 11 It is supported by a structure that is coupled to.

The valve body 13 is provided with three passages. For example, two passages 12a and 12b connected to the discharge chamber side and the crank chamber side, respectively, and the suction pressure Ps are provided to the pressure reducing unit 15, or One passage 12c serving as a passage through which the crank chamber pressure escapes to the suction chamber side is provided, and fluid communication between the discharge chamber and the crank chamber is possible through each passage, and the suction pressure according to the refrigerant load acts. It is possible to discharge the pressurization of the crankcase.

Here, the pressure reducing part 15 is formed below the diaphragm assembly 16 and communicates with the passage 12c side of the valve body 13 by flow paths 33a and 33b.

In addition, the upper end of the housing 11 is provided with a waiting portion 14 to which the spring adjusting device 34 belongs, and the waiting part 14 is formed through a hole in the spring adjusting device 34. It becomes possible.

In addition, a diaphragm assembly 16 made of a conventional diaphragm material and including a stretchable membrane member is provided, and the diaphragm assembly 16 is sandwiched between the upper core 35 and the lower core 36 through the membrane member. It is installed in a losing structure, the upper portion of the diaphragm assembly 16 is installed so that the atmospheric portion 14 is formed at the same time the pressure-reduced portion 15 is formed below.

Accordingly, the diaphragm assembly 16 may basically play a role of opening and closing the passages 12a and 12b together with the plunger 18 while operating according to the pressure acting on the pressure reducing unit 15.

In addition, there is provided a push rod 17 positioned directly below the diaphragm assembly 16 and slidably installed therein, wherein the push rod 17 is extended downward along the center axis of the housing 11. Extends into and slidably engages with its top side through the axis of the plunger 18.

In particular, the present invention provides a plunger 18, which is made of a single piece and has a minimum size and effectively performs a role of a valve body for opening and closing a passage.

The plunger 18 is disposed concentrically on the inner side of the coil 10, the center of which is slidably coupled to the lower end of the push rod 17, and moves up and down by the electromagnetic force of the coil 10 to operate the valve body 13. It will serve to open and close between the two passages (12b, 12c) in).

Of course, in the case of the plunger 18, the flow passage by opening and closing the passage (12a, 12b) of the valve body 13 together with the push rod 21 and the valve rod 21 to be described later while interlocking with the diaphragm assembly 16 side It can also play a role in controlling the

The plunger 18 is elastically supported downward by the return spring 37 mounted around the push rod 21, so that in a situation in which no electromagnetic force is applied, the plunger 18 is positioned downward by the spring force. It becomes possible to maintain the state (path closed state) which is always in contact with the upper end side of the body 13.

For example, when the plunger 18 is moved upward, the bottom of the plunger is separated from the upper end of the valve body 13, so that the suction chamber side passage 12c and the crank chamber side passage 12b can be opened. On the contrary, if the plunger lower end comes into contact with the upper end of the valve body 13, the suction chamber side passage 12c and the crank chamber side passage 12b can be in a closed state.

In addition, a valve rod 21 serving to open and close the discharge chamber side and the crank chamber side passages 12a and 12b in the valve body 13 is provided while interlocking with the plunger 18.

The valve rod 21 is coupled to and supported by the lower end of the plunger 18 and is installed to extend downward along the axis of the valve body 13, and both passages are provided using the valve seat 28 at the lower end. (12a, 12b) serves to open and close the liver.

In particular, the valve rod 21 has a flow path 19 penetrating from the lower end through the center axis line, and penetrated in the radial direction from the flow path 19 at this time, and an upper end portion of the valve body 13, In other words, an outlet 20 is formed which communicates with the space 37 formed around the engaging portion between the plunger 18 and the valve rod 21.

Accordingly, when the plunger rises, the crankcase pressure can flow to the suction chamber through the flow passage 19 and the outlet 20 in the valve rod 21.

In addition, the plunger 18 and the valve rod 21 may be coupled to each other in a manner that is fitted to each other by various methods.

As an example, the protrusions 22 formed on the plunger 18 may be coupled in a form fitted to the inner diameter of the valve rod 21.

In this case, the protrusion 22 may be slidably fitted to the inner diameter of the valve rod 21, that is, it may be fitted in a loose fitting structure, in which case the valve rod 21 may be a spring 23 below. By being supported by the elasticity it is possible to operate with the plunger 18.

As another example, as shown in FIG. 5, a protrusion 22 is formed at a lower end of the plunger 18, and the protrusion 22 is integrally bound to the rod-side inner diameter of the valve rod 21. That is, it is possible to operate with the plunger 18 while being combined into an interference fit structure, in which the spring can be deleted and the advantage of eliminating the sheet press-fitting and adjustment process can be obtained.

As another example, as shown in FIG. 6, a groove 24 is formed at a lower end of the plunger 18, and the outer diameter of the valve rod 21 is fitted into the groove 24 at this time. It becomes possible.

At this time, the outer diameter of the valve rod 21 is slidably fitted in the groove portion 24 of the plunger 18, that is, it can be coupled in a loose fitting structure, in this case the valve rod 21 is It is elastically supported by the spring 23 to be able to operate with the plunger 18.

As another example, as shown in FIG. 7, the groove 24 of the plunger 18 may be coupled to the outer diameter of the valve rod 20. While integrally bound to (24), that is to say coupled to the interference fit structure can be operated with the plunger 18.

In this case, the spring can be deleted, and the advantage of eliminating the sheet press-fitting and adjusting process can be obtained.

Therefore, looking at the operating state of the electronic control valve is configured as follows.

4A and 4B are sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a first embodiment of the present invention.

As shown in Fig. 4A, the state when the cooling load is not so large, that is, when the air conditioner is normally operated without being overloaded is shown.

For example, the plunger 18 and the valve rod 21 are kept in a lowered state, so that the lower end portion of the plunger 18 is in contact with the upper end of the valve body 13 while opening the passage between the suction chamber side and the crank chamber side. At the same time, the valve seat 28 of the valve rod 21 maintains an open state, so that a part of the refrigerant of the discharge pressure Pd discharged from the discharge chamber is introduced into the crank chamber and the pressure Pc inside the crank chamber. This can be controlled.

As the discharge pressure Pd is introduced into the crank chamber, the crank chamber internal pressure Pc becomes larger than the suction chamber side pressure Ps, so that the inclination of the swash plate becomes smaller (swash plate is raised), and eventually the air conditioner capacity at this time Can be determined from the appropriate line according to the air conditioner operating situation.

As shown in Fig. 4B, the air conditioner starts up, that is, the air conditioner is turned on.

When the air conditioner power source is turned on, the plunger 18 rises while the maximum current is supplied to the coil 10 under the control of a controller (not shown), and is discharged by the valve seat 28 of the valve rod 21. As the gap between the actual passage 12a and the crank chamber side passage 12b is closed, the passage of the discharge pressure Pd to the crank chamber side is blocked.

From then on, as the crank chamber side and the suction chamber side are opened, the crank chamber side internal pressure Pc is increased between the flow passage 19 → outlet 20 → space 38 → plunger and the valve body of the valve rod 21. The gap is drawn out through the passage 12c on the suction chamber side, thereby increasing the inclination of the swash plate (as the swash plate is laid down), thereby ensuring the maximum variable capacity, and at the same time operating the air conditioner at the maximum variable capacity. The air conditioning performance can be exhibited to allow for rapid cooling.

Of course, if the room becomes cool after a certain time has elapsed after the air conditioner is activated, the current supplied to the coil 10 is gradually reduced and then shut off by the control of the controller, so that the electronic control valve is in a normal operating state, for example, FIG. 4A. Can be switched to a state such as

8 is an exploded perspective view showing an electronic control valve of a variable displacement compressor according to a fifth embodiment of the present invention.

As shown in Fig. 8, the shape of the plunger consisting of two component combinations is shown here.

The plunger 18 is composed of an upper plunger body 18a and a lower plunger sheet 18b, and the plunger body 18a and the plunger sheet 18b can move together while being in contact with each other up and down. do.

Here, the plunger main body 18a is slidably coupled to the lower end of the push rod 17 through the hole in the center axis thereof, and is disposed concentrically on the inner side of the coil 10 to be operated up and down by an electromagnetic force.

In addition, the plunger sheet 18b comes into contact with the lower end of the plunger body 18a through the upper end thereof, and accommodates the plunger spring 25a inward and is elastically supported downward by the plunger spring 25a at this time. While being in contact with and detachable from the top of the valve body 13.

At this time, the center portion of the bottom surface of the plunger seat 18b, that is, the edge of the edge of the hole through which the valve rod 21 penetrates is caught by the seal member 26 mounted on the outer circumference of the valve rod 21. In this case, it is possible to operate up and down together with the plunger 18 and the valve rod 21 by the engaging action with the seal member 26 at this time.

Here, the plunger sheet 18b is made of a nonmagnetic material such as aluminum, so that the manufacturing cost can be lowered, and the heat generation amount is small, so that the problem affecting the performance can be eliminated.

9A and 9B are sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a fifth embodiment of the present invention.

9A and 9B, the operation of the electronic control valve is the same as the operation of the electronic control valve provided in the first to fourth embodiments, except that the plunger combination type is different. Since there is a difference in the description will be described.

For example, when the air conditioner power is turned on, the plunger main body 18a and the valve rod 21 rise, and at the same time, the seal member 26 pulls up the plunger seat 18b as the valve rod 21 rises. I will go.

As a result, the valve seat 28 of the valve rod 21 is closed between the discharge chamber side passage 12a and the crank chamber side passage 12b, thereby preventing the discharge pressure Pd from flowing to the crank chamber side.

Then, the crank chamber side internal pressure Pc passes through the flow passage 19 → outlet 20 → space 38 → the plunger seat and the valve body of the valve rod 21 → the passage 12c on the suction chamber side. As it exits, the inclination of the swash plate increases, thus ensuring maximum variable capacity.

10 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a sixth embodiment of the present invention.

As shown in Fig. 10, the shape of the plunger consisting of three component combinations is shown here.

The plunger 18 is a plunger main body 18a which rises by an electromagnetic force, a plunger ring 18c which opens and closes the crank chamber side passage 12b and the suction chamber side passage 12c and a plunger pin 18d for moving it. It is composed.

The center of the plunger body 18a is slidably coupled to the lower end of the push rod 17, and is disposed in a concentric manner on the inner side of the coil 10, and is configured to be operated up and down by an electromagnetic force.

In addition, the plunger ring 18c is installed in a structure that is always elastically supported in the downward direction by the plunger spring 25b installed between the lower end of the plunger body 18a and the valve body 13 using a spring force. The upper end of the valve body 13 is detachable from the upper end of the valve body 13 at the same time as being in contact with the upper end of the valve.

In addition, the plunger pin 18d is a member connecting the plunger main body 18a and the valve rod 21, and is fitted into the lower end hole of the plunger main body 18a through the upper end thereof and coupled to the valve rod through the lower end thereof. It fits into the inner diameter of the upper end of 21.

In particular, the locking jaw 27 is protrudingly formed around the lower end of the plunger pin 18d, and the locking jaw 27 at this time performs a function of moving the plunger ring 18c upward when the plunger pin is raised. do.

Of course, the plunger ring 18c and the plunger pin 18d may be made of a nonmagnetic material such as aluminum.

11A and 11B are sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a sixth embodiment of the present invention.

As shown in Figs. 11A to 11B, the operation of the electronic control valve is the same as the operation of the electronic control valve provided in the first to fourth embodiments, except that the plunger combination type is different. Since there is a difference in the description will be described.

For example, when the air conditioner power is turned on, the valve rod 21 via the plunger main body 18a and the plunger pin 18d rises, and at the same time as the valve rod 21 rises, the plunger pin 18d The locking jaw 27 pulls up the plunger ring 18c.

Thereby, while the valve seat 28 of the valve rod 21 is closed between the discharge chamber side passage 12a and the crank chamber side passage 12b, the discharge pressure Pd is blocked from passing to the crank chamber side, and the crank chamber side is blocked. The internal pressure Pc is passed through the passage 19 → the outlet 20 → the space 38 → the gap between the plunger ring and the valve body → the passage 12c on the suction chamber side of the valve rod 21, and then the swash plate As the slope of increases, the maximum variable capacity can be obtained.

12 is a cross-sectional view showing an electronic control valve of a variable displacement compressor according to a seventh embodiment of the present invention.

As shown in FIG. 12, the electronic control valve has the same basic form as the electronic control valve provided in the first to sixth embodiments, and includes a push rod 17, a plunger 18, and a relief valve. (29) includes a new combination of forms.

To this end, the push rods 17 extend long downward from just below the diaphragm assembly 16 and are joined together while penetrating the central axis of the plunger 18.

That is, the push rod 17 and the plunger 18 are integrally coupled by the snap ring member mounted on the outer diameter of the rod body, and can be operated together in this coupled state.

In addition, the push rod 17 is slidable with the diaphragm assembly 16 through an upper end thereof, and a lower end extending downwardly is positioned inside the valve body 13 to open the valve seat 28 at the lower end thereof. The discharge chamber side and the crank chamber side passages 12a and 12b in the valve body 13 can be opened and closed.

In addition, the plunger 18 is disposed concentrically on the inner side of the coil 10 to be able to operate up and down by the electromagnetic force, coupled to the push rod 17 through the hole in the center axis of the plunger 18 to move together. do.

In particular, a relief valve 29 for opening and closing the crank chamber side passage 12b and the suction chamber side passage 12c is provided inside the valve body 13, and the relief valve 29 at this time is the plunger 18. While sliding with the lower end of the crank chamber side pressure to flow to the suction chamber side or serves to block.

To this end, the relief valve 29 is composed of a valve body 29a and a valve spring 29b, wherein the valve body 29a is installed in the bypass flow path 30 formed in the valve body 13. In order to open and close the flow path, the valve spring 29b is installed in the bypass flow path 30 to serve to elastically support the valve body 29a at all times.

In this case, the bypass flow path 30 means a flow path for communicating the crank chamber side passage 12b and the suction chamber side passage 12c.

13A and 13B are sectional views showing an operating state of an electronic control valve of a variable displacement compressor according to a seventh embodiment of the present invention.

As shown in FIG. 13A, in a situation where the air conditioner is normally operated without a large cooling load, the plunger 18 and the push rod 17 are kept lowered by the spring force, and thus the plunger 18 is maintained. Since the lower end portion of the relief valve 29 presses the upper end, the passage between the suction chamber side and the crank chamber side is closed while the bypass flow path 30 is blocked by the relief valve 29.

In addition, since the valve seat 28 of the push rod 17 is kept open, a portion of the refrigerant of the discharge pressure Pd discharged from the discharge chamber is introduced into the crank chamber, and the pressure Pc inside the crank chamber is decreased. Can be controlled.

As shown in FIG. 13B, when the air conditioner power source is turned on, the plunger 18 rises while the maximum current is supplied to the coil 10 under the control of a controller (not shown). The valve seat 28 closes between the discharge chamber side passage 12a and the crank chamber side passage 12b, thereby preventing the discharge pressure Pd from flowing to the crank chamber side.

As the plunger 18 rises in this way, the valve body 29a of the relief valve 29 also rises, and the bypass flow path 30 is opened, whereby the crankcase side internal pressure Pc opens the bypass flow path 30. After the passage, the gas passes through the passage 12c on the suction chamber side.

Therefore, as the inclination of the swash plate is increased, it is possible to secure the maximum variable capacity, and as a result, the air conditioner performance can be exerted with the maximum variable capacity at the same time as the air conditioner operation, thereby enabling rapid cooling.

In the above, certain preferred embodiments according to the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and a person of ordinary skill in the art may vary without departing from the spirit of the technical idea of the present invention described in the claims below. Will be able to carry out the change.

10 coil 11 housing
12a, 12b, 12c: passage 13: valve body
14: waiting part 15: decompression part
16: diaphragm assembly 17: push rod
18: Plunger 19: Euro
20: outlet 21: valve rod
22: protrusion 23: spring
24: groove portion 25a, 25b: plunger spring
26: seal member 27: locking jaw
28: valve seat 29: relief valve
30: bypass euro 31: housing body
32: bobbin 33a, 33b: euro
34: spring adjuster 35: upper core
36: lower core 37: return spring
38: space part

Claims (11)

A housing 11 having a coil 10 inside;
A valve body 13 having passages 12a and 12b connected to the discharge type side and the crank chamber side, and a suction chamber side passage 12c, respectively, coupled to the lower part of the housing 11;
A waiting part 14 formed along the upper end axis of the housing 11 to form a diaphragm waiting side;
A diaphragm assembly 16 positioned directly below the atmospheric part 14 and operated according to a suction pressure of the pressure reducing part 15 formed at a lower portion thereof;
A push rod 17 positioned directly below the diaphragm assembly 16 and slidable;
The center of the push rod 17 is slidably coupled to the lower end of the push rod 17, and is disposed concentrically on the inside of the coil 10 to be moved up and down by an electromagnetic force, thereby contacting and separating the upper end of the valve body 13. A plunger 18 which opens and closes the suction chamber side passage 12c and the crank chamber side passage 12b;
Coupled to the lower end of the plunger 18, the discharge chamber side and the crank chamber side passages (12a, 12b) in the valve body 13 can be opened and closed while being operated up and down together, the flow path (19) and radius passing along the central axis line And a valve rod (21) capable of flowing the crankcase side pressure to the suction chamber side through the outlet (20) passing along the direction. The method of claim 1, wherein the plunger 18 and the valve rod 21 is coupled in such a way that the plunger side protrusion 22 is fitted to the rod side inner diameter, wherein the protrusion 22 is slidably fitted at the rod side inner diameter. At the same time, the valve rod 21 is elastically supported by the lower spring 23 while being able to operate together with the plunger 18, the electronic control valve of a variable displacement compressor.
The method of claim 1, wherein the plunger 18 and the valve rod 21 is coupled in such a way that the plunger side protrusion 22 is fitted to the rod side inner diameter, wherein the protrusion 22 is integrally bound to the rod side inner diameter Electronic control valve of a variable displacement compressor, characterized in that it is possible to operate with the plunger (18).
The method of claim 1, wherein the plunger 18 and the valve rod 21 is coupled to the plunger side groove portion 24 in a form fitted to the rod side outer diameter, wherein the rod side outer diameter is slidably fitted in the groove portion 24 At the same time, the valve rod 21 is elastically supported by the lower spring 23 while being able to operate together with the plunger 18, the electronic control valve of a variable displacement compressor.
The method of claim 1, wherein the plunger 18 and the valve rod 21 is coupled to the plunger side groove portion 24 in a form fitted to the rod side outer diameter, wherein the rod side outer diameter is integrally bound to the groove portion 24 Electronic control valve of a variable displacement compressor, characterized in that it is possible to operate with the plunger (18).
The plunger body (18a) according to claim 1, wherein the plunger (18) is slidably coupled to the lower end of the push rod (17) and is disposed concentrically on the inside of the coil (10) to be operated up and down by an electromagnetic force. ) And a seal member in the valve rod 21 which are in contact with and separated from the upper end of the valve body 13 while being elastically supported by the plunger spring 25a therein while being in contact with the lower end of the plunger body 18a. An electronic control valve for a variable displacement compressor, characterized by comprising a plunger seat (18b) that moves up and down through a locking action with (26).
7. The electronic control valve of claim 6, wherein the plunger seat (18b) is made of a nonmagnetic material.
The plunger body (18a) according to claim 1, wherein the plunger (18) is slidably coupled to the lower end of the push rod (17) and is disposed concentrically on the inside of the coil (10) to be operated up and down by an electromagnetic force. ), A plunger ring 18c which is elastically supported by a plunger spring 25b provided between the lower end of the plunger body 18a and is in contact with and detachable from an upper end of the valve body 13, and the plunger The upper end is coupled to the lower end of the main body 18a, and the lower end is coupled to the valve rod 21 and is composed of a plunger pin 18d that moves the plunger ring 18c upward by using the locking jaw 27 at the lower end. Electronic control valve of a variable displacement compressor characterized in that it is.
9. The electronic control valve of claim 8, wherein the plunger ring (18c) and the plunger pin (18d) are made of a nonmagnetic material.
A housing 11 having a coil 10 inside;
A valve body 13 having passages 12a and 12b connected to the discharge type side and the crank chamber side, and a suction chamber side passage 12c, respectively, coupled to the lower part of the housing 11;
A waiting part 14 formed along the upper end axis of the housing 11 to form a diaphragm waiting side;
A diaphragm assembly 16 positioned directly below the atmospheric part 14 and operated according to a suction pressure of the pressure reducing part 15 formed at a lower portion thereof;
A valve seat located at the bottom of the diaphragm assembly 16 that is slidable, coupled to and operative through the central axis of the plunger 18, and which is located inside the valve body 13 A push rod 17 which opens and closes the discharge chamber side and the crank chamber side passages 12a and 12b in the valve body 13 using the 27;
A plunger 18 coupled to a center of the push rod 17 and disposed concentrically on an inner side of the coil 10 to be operated up and down by an electromagnetic force;
Electronic control of the variable displacement compressor, characterized in that it comprises a relief valve (29) installed inside the valve body (13) to allow the crankcase pressure to flow to the suction chamber side while sliding with the lower end of the plunger (18). valve.
11. The valve according to claim 10, wherein the relief valve (29) is in contact with the plunger (18) side and the upper end thereof, and is formed in the valve body (13) to communicate the crank chamber side passage (12b) with the suction chamber side passage (12c). An electronic control valve of a variable displacement compressor, comprising a valve body (29a) for opening and closing the bypass flow path (30), and a valve spring (29b) for elastically supporting the valve body (29a) upward.

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