KR101258342B1 - Control valve for a variable displacement compressor - Google Patents

Abstract

According to the present invention, there is provided a crank chamber port communicating with the crank chamber to the outside, a discharge port communicating with the discharge chamber, and a suction port communicating with the suction chamber, and having a crank chamber port and a discharge port communicating with each other. , A valve body having a first extraction flow path formed so that the crank chamber port and a suction port communicate with each other, provided in the valve body, and an operating portion having a second extraction flow path communicating from the central portion to the side, provided inside the valve body. And a driving unit connected to the operating unit and reciprocating the operating unit in accordance with a current applied from the outside. In the normal state, the control passage is opened and the first extraction passage and the second extraction passage are closed, and the pressure in the crankcase To control the angle of the swash plate, the refrigerant in the discharge chamber flows through the control flow passage into the crank chamber, and the pressure in the suction chamber is increased. Alternatively, when the pressure of the crankcase is abnormally high bleeding state, the operating part moves, the control flow is closed, and the first bleeding flow passage and the second bleeding flow passage are opened so as to communicate with each other, and the refrigerant in the crankcase flows with the first bleed flow passage. Provided is a control valve for a variable displacement compressor that flows through the second bleeding flow path and flows into the suction chamber so that the pressure in the crank chamber is lowered.
Therefore, the performance of the compressor can be improved by eliminating the operation delay caused by the liquid refrigerant and improving the operability at the initial startup even after standing for a long time.

Description

Control valve for a variable displacement compressor

The present invention relates to a control valve for a variable displacement compressor, and more particularly to a control valve for a variable displacement compressor that can improve the performance of the variable displacement compressor.

In general, the swash plate compressor is widely used as a compressor of an automotive air conditioner, and the swash plate compressor is divided into various types according to the compression method and structure. Recently, a variable capacity compressor capable of varying the compression capacity has been used. . The variable displacement compressor adjusts the inclination of the swash plate, thereby adjusting the capacity of the variable displacement compressor. That is, when the variable displacement compressor increases the amount of refrigerant flowing from the discharge chamber of the variable displacement compressor to the crank chamber, the pressure of the crank chamber increases, so that the inclination of the swash plate is decreased, so that the capacity of the variable displacement compressor is increased. Becomes smaller.

However, in the conventional variable displacement compressor, in particular, in the summer, when the compressor is initially started after being left for a certain time, the operation of the compressor is delayed while the pressure in the suction chamber is increased or the pressure in the crank chamber is increased by the liquid refrigerant. It was difficult to secure fast cooling performance, and there was a problem of generating an explosion or noise according to the operation.

An object of the present invention is to provide a control valve for a variable displacement compressor that can improve the performance of the compressor by eliminating the operation delay caused by the liquid refrigerant during the initial startup of the compressor.

The present invention relates to a control valve for a variable displacement compressor that pressurizes a refrigerant sucked from a suction chamber and discharges it to a discharge chamber using a plurality of pistons coupled to a swash plate disposed in a crank chamber and reciprocating. A control passage formed with a crank chamber port communicating with the crank chamber, a discharge port communicating with the discharge chamber, and a suction port communicating with the suction chamber, wherein the crank chamber port and the discharge port communicate with each other; The crank chamber port and the suction port is formed in communication with each other, the valve body is formed with a first extraction flow path, the valve body is provided in the interior of the valve body, the second extraction flow path is formed in communication from the central portion to the side of the valve body A drive provided in the interior and connected to the operation part to reciprocate the operation part according to a current applied from the outside; In addition, the control passage is opened in the normal state and the first extraction channel and the second extraction channel is closed, the refrigerant in the discharge chamber so that the angle of the swash plate is controlled by adjusting the pressure in the crank chamber When the control flows into the crank chamber and flows into the crank chamber, when the pressure in the suction chamber rises or when the pressure in the crank chamber is abnormally high in the bleeding state, the operating unit moves to close the control flow path, and the first bleeding flow passage And the second extraction flow path are opened while communicating with each other, the refrigerant in the crank chamber flows through the first extraction flow path and the second extraction flow path flows into the suction chamber so that the pressure of the crank chamber is lowered Provided is a control valve for a compressor.

Therefore, the control valve for the variable displacement compressor according to the present invention can improve the performance of the compressor by eliminating the operation delay caused by the liquid refrigerant and improving the operability at the initial startup even after standing for a long time.

1 is a cross-sectional view showing the internal height of the control valve for a variable displacement compressor according to an embodiment of the present invention.
2 is an enlarged view of a portion A in Fig.
3 is a cross-sectional view showing the internal structure and the refrigerant flow in the steady state of the control valve for the variable displacement compressor of FIG.
FIG. 4 is a cross-sectional view illustrating an internal structure and a refrigerant flow when the control valve for the variable displacement compressor of FIG. 1 is in the extraction state.

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

First, referring to FIG. 1, a control valve for a variable displacement compressor (hereinafter, referred to as a “control valve”) 500 according to an embodiment of the present invention is a variable displacement compressor (hereinafter referred to as a “compressor”). By using a plurality of pistons (not shown) coupled to the swash plate (not shown) disposed in the crank chamber of the c), the refrigerant sucked from the suction chamber is pressurized, and then discharged to the discharge chamber. Here, the structure of the compressor may be variously selected, such as Patent Nos. 529716, 525185, and 572123.

The control valve 500 includes a valve body 100, a drive unit 200, and an operation unit 300. The valve body 100 includes a plurality of crank chamber ports 110 communicating with the crank chamber at one end portion, a plurality of discharge ports 120 communicating with the discharge chamber on an outer circumferential side thereof, and a discharge port on an outer circumferential side thereof. A plurality of suction ports 130 spaced apart from the 120 and in communication with the suction chamber are formed.

In addition, the valve body 100 may internally include a control passage B (see FIG. 3) formed such that the crank chamber port 110 and the discharge port 120 communicate with each other, and the crank chamber port 110. A first extraction passage C1 (see FIG. 4) is formed in which the suction ports 130 communicate with each other.

The control passage B is formed in the axial direction from the crank chamber port 110 and is formed along the circumferential direction toward the discharge port 120. The first extraction passage C1 is formed in the axial direction from the crank chamber port 110 to share a portion corresponding to the control passage B, and extends in the axial direction of the control passage B. In the circumferential direction toward the suction port 130 is formed.

The driving unit 200 is provided inside the valve body 100 and serves to reciprocate the operating unit 300 according to a current applied from the outside. The driving unit 200 includes a needle 210 and a solenoid 220. The needle 210 is disposed axially in the valve body 100, and one end thereof is coupled to the needle housing 211.

The solenoid 220 is coupled to one end of the needle 210 and the needle housing 211 in the valve body 100 along an outer circumferential surface, thereby applying an operating force to the operating unit 300. The actuating unit 300 serves to reciprocate along the axial direction. Here, the solenoid 220 is a solenoid including a coil, as long as it can be configured to impart an operating force to the operating unit 300 by a current applied from the outside, the detailed description thereof will be described with a known solenoid Since they are substantially similar, they will be omitted.

The operation unit 300 is coupled to the plunger 230 and the plunger 230 to move in conjunction with the plunger 230 to open and close the control channel (B) and the first extraction channel (C1) and An air supply valve unit 310 in which a second air extraction channel C2 is formed, and an air supply valve unit 320 provided inside the air supply valve unit 310 to control opening and closing of the second air extraction channel C2; Include.

The plunger 230 is slidably coupled to the other end of the needle 210 to reciprocate in the axial direction along the needle 210 by the drive unit 200.

The air supply valve unit 310 is coupled to the plunger 230 and moves in the axial direction while interlocking with the plunger 230, and opens and closes the control flow path B in accordance with the axial movement. The flow path C2 is formed. Here, the second bleeding flow passage (C2) is made of a structure that communicates with the outlet 312 formed on the outer peripheral side while passing through the axial center portion from the inlet 311 formed in one end of the air supply valve 310 And communicates with the first extraction channel C1. On the other hand, the air supply valve 310, the locking portion 3110 is formed on the inner peripheral surface, a description thereof will be described later.

The bleed valve unit 320 is provided in the air bleed valve unit 310, and serves to control the opening and closing of the second bleeding flow path (C2) formed in the air bleed valve unit 310, the bellows 321 and the bleed valve main body 324.

The bellows 321 has a characteristic of expanding or contracting according to pressure, and is disposed along the axial direction in the air supply valve part 310 to expand or contract according to the pressure of the suction chamber. It moves in the axial direction of the valve body 100 in accordance with the contraction. Here, the bellows 321 is coupled to the support member 231, one end of which will be described later, which will be described later.

The bleed valve main body 324 is coupled to the bellows 321, moves in accordance with the expansion or contraction of the bellows 321 to open and close the second bleeding flow path (C2), the valve seat 322, Flow tube 323.

One end of the valve seat 322 is coupled to the other end of the bellows 321 and moves axially in accordance with the expansion or contraction of the bellows 321. The valve seat 322 has a flange 3221 is formed to protrude outward in the circumferential direction on the outer circumferential surface and the description of the flange 3221 will be described later.

The flow pipe 323 has a tubular shape in which one end is integrally coupled with the other end of the valve seat 322 and communicates with the second bleeding flow passage C2. The flow pipe 323, the outer circumferential surface is in sliding contact with the inner circumferential surface of the air supply valve portion 310, the through hole communicates with the inlet 311 and communicates with the second bleed flow passage (C2) to the other end 3321 is formed, and on the outer circumferential side thereof, a discharge port 3322 communicating with the second extraction channel C2 is formed. Thus, the refrigerant in the flow pipe 323 is discharged to the discharge port (3232) after moving through the through hole (3231) to the center in the axial direction.

Furthermore, the present embodiment further includes a support part 234 disposed inside the air supply valve part 310. The support part 234 includes a support member 231, a spring 233, and a stopper 232. The support member 231 is coupled to the needle 210 and its position is fixed, and the other end is coupled to one end of the bellows 321 to support the bellows 321. The spring 233 is disposed inside the bellows 321, one end of which is fitted to the support member 321, and the other end of which is coupled to the stopper 232 to cushion the movement of the stopper 232. It works. The stopper 232 is coupled to the other end of the spring 233 and disposed to be spaced apart from the bleed valve body 324, thereby limiting the movement of the bleed valve body 324.

On the other hand, the present embodiment is a refrigerant flow space (3) so that the refrigerant flowing out of the discharge port (3232) between the outer circumferential side surface of the valve seat 322 and the inner circumferential surface of the air supply valve unit 310 flows to the outlet (312) A) is formed, and the refrigerant flow space A forms the first and second bleeding passages C1 and C2.

In this embodiment, the engaging portion 3110 formed on the inner circumferential surface of the air supply valve part 310 and the flange 3221 formed on the outer circumferential surface of the valve seat 322 are positioned on the refrigerant flow space A. The valve seat 322 is moved according to the expansion or contraction of the bellows 321, and the valve seat 322 is contacted or separated from the latching part 3110 according to the movement of the valve seat 322 so that the refrigerant The second extraction channel C2 is opened and closed by opening or closing the flow space A. FIG. Here, the present embodiment, the opening and closing of the second extraction flow path (C2) is made by the contact of the flange 3321 and the engaging portion 311 of the valve seat 322, wherein the flange 3221 and Since the locking portion 311 is opened and closed by a ring-shaped contact portion, the opening and closing control area is relatively large, and thus the opening and closing of the second extraction passage can be more accurately and stably performed. On the other hand, Pc in FIG. 1 represents the crankcase refrigerant pressure, Pd represents the discharge refrigerant pressure, and Ps represents the suction refrigerant pressure of the compressor.

In this embodiment, the outer circumferential surface of the flow tube 323 and the inner circumferential surface of the air supply valve unit 310 are slidably contacted with each other, and the flow tube 323 has one or a plurality of refrigerant grooves 3233 as outer circumferential surfaces thereof. Formed. Referring to FIG. 2, the coolant groove 3333 allows the coolant to flow therein so as to reduce frictional force between the outer circumferential side of the flow pipe 323 and the inner circumferential surface of the air supply valve part 310. And it serves to facilitate the sliding movement with the air supply valve unit 310. On the other hand, one or a plurality of coolant grooves 3333 may be formed in some cases, and the shape of the coolant grooves 3233 may be variously formed in a circumferential direction or an axial direction. Although the coolant grooves 3333 in the present embodiment have been shown as an example in the form of a spiral wound along the outer circumferential surface of the flow pipe 323, it is not limited thereto.

3 and 4, the operation of the control valve 500 for a variable displacement compressor according to the present embodiment will be described. First, prior to explaining the operation of the control valve 500, the normal state described below refers to a normal state in which the angle of the swash plate is controlled by adjusting the pressure in the crank chamber, and the additional state It refers to an abnormal state in which the pressure in the suction chamber rises or the pressure in the crank chamber is abnormally high, so that the bleeding flow path C is opened.

3 shows the internal structure of the control valve 500 in the normal state, the control valve 500 in the normal state, the control passage so that the angle of the swash plate is controlled by adjusting the pressure in the crank chamber (B) is opened and the first extraction channel C1 and the second extraction channel C2 are closed, so that the coolant in the discharge chamber flows through the control channel B and flows into the crank chamber.

However, when the pressure of the suction chamber is increased or the pressure of the crank chamber is abnormally high due to liquid refrigerant or the like due to exposure to sunlight for a long time instead of the above-mentioned normal state, the operation of the compressor at the initial start of the compressor is not performed. There is a delay problem.

Thus, the present embodiment is to solve the problems such as the operation delay of the compressor in the additional recording state, in the case of the additional recording state to control the control valve 500 to the recording state, the control in this recording state The operation of the valve 500 will be described with reference to FIG. 4.

First, in the present embodiment, the control channel B is closed by moving the operating unit 300 in the case of the additional recording state, and the first extraction channel C1 and the second extraction channel C2 communicate with each other. By opening, the refrigerant in the crank chamber flows through the first extraction channel C1 and the second extraction channel C2 and flows into the suction chamber, thereby controlling the pressure of the crank chamber to decrease.

That is, when the pressure Ps of the suction chamber is increased, the control valve 500 in the additional extraction state contracts the bellows 321 to move the extraction valve part 320 while the second extraction is performed. The flow path C2 is opened, and the compressor is started, while the operating part 300 and the air supply valve part 310 move to the left side, and the first bleeding flow path C1 is opened to cool the refrigerant in the crank chamber. The first extraction flow path (C1) and the second extraction flow path (C2) flows to the suction chamber to lower the pressure of the crank chamber.

On the other hand, when the above additional extraction state, the crankcase side pressure (Pc) is lowered to achieve the maximum swash plate angle, thereby increasing the compressor discharge amount, the temperature of the evaporator of the air conditioner in which the compressor is installed is rapidly reduced. When the temperature of the evaporator is lowered in this way, the pressure Ps of the suction chamber is also reduced. When the pressure of the suction chamber is reduced, the bellows 321 is expanded, and the bleed valve part 320 is moved. The second bleeding flow path C2 is closed and only the air supply valve part 310 proportional to the input current is operated to block the refrigerant flow from the crank chamber to the suction chamber. In this case, in FIG. 4, the first extraction channel C1 is a line including a thin dotted line and a thick dotted line, and the second extraction channel C2 is a thin dotted line portion communicating with the first extraction channel C1. Indicates.

As described above, the control valve 500 according to the present embodiment opens the control passage only in the normal state so that the refrigerant in the discharge chamber flows into the crank chamber through the control passage B so as to be in the crank chamber. Adjust the pressure so that the angle of the swash plate is controlled, and if the pressure in the suction chamber rises or the pressure in the crank chamber is abnormally high, the control passage B is closed and the first and second extraction channels (C1, C2) is to be opened to allow the refrigerant in the crank chamber flows into the suction chamber can effectively prevent the operation delay of the compressor.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100 ... valve body 110 ... crankcase port
120 ... discharge port 130 ... suction port
200 ... drive 210 ... needle
220 ... Solenoid 230 ... Plunger
231 ... support member 232 ... stopper
233 ... spring 300 ... operating part
310 ... Air supply valve section 320 ... Air supply valve section
500 ... control valve

Claims (10)

In the control valve for a variable displacement compressor for pressurizing the refrigerant sucked from the suction chamber using a plurality of pistons coupled to the swash plate disposed in the crank chamber, and discharged to the discharge chamber,
A crank chamber port communicating with the crank chamber to the outside, a discharge port communicating with the discharge chamber, and a suction port communicating with the suction chamber are formed therein, and a control passage formed so that the crank chamber port and the discharge port communicate with each other. And a valve body having a first extraction flow path formed such that the crank chamber port and the suction port communicate with each other.
An operating part provided inside the valve body and having a second extraction passage communicating from the center to the side;
It is provided inside the valve body, including a drive unit for reciprocating the operating unit in accordance with the current applied from the outside,
In the normal state, the control flow path is opened and the first extraction flow path and the second extraction flow path are closed, and the refrigerant in the discharge chamber controls the control flow path so that the angle of the swash plate is controlled by adjusting the pressure in the crank chamber. Flows into the crankcase,
When the pressure of the suction chamber is increased or the pressure of the crank chamber is abnormally high bleeding state, the operation unit moves, the control passage is closed, and the first bleeding passage and the second bleeding passage are opened while communicating with each other. And a refrigerant in the crank chamber flows through the first extraction channel and the second extraction channel and flows into the suction chamber so that the pressure in the crank chamber is lowered. The method according to claim 1,
The valve body,
One or a plurality of crankcase ports are formed at one end side, one or a plurality of the discharge ports are formed at an outer circumferential side, and one or a plurality of the suction ports are formed to be spaced apart from the discharge port at an outer circumferential side. The control passage is formed in the axial direction from the crank chamber port in the circumferential direction toward the discharge port, and the first extraction passage is formed in the axial direction from the crank chamber port in the circumferential direction toward the suction port. Control valve for variable displacement compressor formed in the direction. The method according to claim 1,
The driving unit includes:
A needle disposed inside the valve body;
Control valve for a variable displacement compressor including a solenoid provided on the valve body for applying an operating force for reciprocating the operating unit. The method according to claim 3,
Wherein,
A plunger slidably coupled to the other end of the needle;
The plunger is coupled to the plunger and moves in conjunction with the plunger to open and close the control flow passage, and is formed through the axial center portion from the inlet formed at one end thereof, and communicates with the outlet formed on the outer circumferential side thereof and communicates with the first extraction flow passage. An air supply valve unit having a second bleeding flow path;
The control valve for a variable displacement compressor provided in the air supply valve unit including a bleed valve portion for controlling the opening and closing of the second bleed flow passage. The method of claim 4,
The bleed valve unit,
A bellows which is located inside the air supply valve part and expands or contracts according to the pressure of the suction chamber,
Combination with the bellows, the control valve for a variable displacement compressor comprising a bleed valve body for opening and closing the second bleed flow channel moving in accordance with the expansion or contraction of the bellows. The method according to claim 5,
One end coupled to the needle and the other end coupled to one end of the bellows to support the bellows;
A spring coupled to the support member;
And a stopper coupled with the spring to limit movement of the bleed valve body. The method according to claim 5,
The bleed valve body,
A valve seat coupled with the other end of the bellows;
One end is coupled to the valve seat and the outer circumferential surface is slidably moved in contact with the inner circumferential surface of the air supply valve part, and the other end is formed with a through hole to communicate with the second extraction channel and to communicate with the second extraction channel on the outer peripheral side. Control valve for a variable displacement compressor including a flow pipe with a discharge port. The method of claim 7,
The flow pipe,
One or a plurality of refrigerant grooves are formed on the outer circumferential surface to facilitate the sliding movement of the flow pipe to facilitate the sliding movement of the flow tube. The method according to claim 8,
The refrigerant groove is a variable displacement control valve formed in a spiral shape along the outer peripheral surface of the flow pipe. The method of claim 7,
The air supply valve portion, the engaging portion is formed on the inner peripheral surface,
The valve seat is variable capacity including a flange which is formed to protrude outward in the circumferential direction on the outer circumferential surface, the flange seat for opening and closing the second bleed flow channel while moving in accordance with the expansion or contraction of the bellows to contact or separate the engaging portion Type control valve.

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