KR20200064678A - Electric control valve for variable displacement compressor - Google Patents

Abstract

According to the present invention, disclosed is an electrical control valve (ECV) of a variable displacement compressor. According to an embodiment of the present invention, an ECV of a variable displacement compressor comprises: a valve body in which a discharge pressure port and a crankcase pressure port are formed in a hollow cylindrical shape; and a solenoid which allows a rod to reciprocate in the longitudinal direction by a magnetic field formed in a coil to open and close the discharge pressure port and the crankcase pressure port of the valve body. The rod is moved to the inside of the valve body and is configured by mounting an O-ring to a portion in contact with the valve body.

Description

Electronic control valve of variable capacity compressor {ELECTRIC CONTROL VALVE FOR VARIABLE DISPLACEMENT COMPRESSOR}

The present invention relates to an electronic control valve of a variable displacement compressor, and more particularly, to an electronic control valve of a variable displacement compressor having a structure capable of preventing defective swash plate angle control due to wear.

In general, an air conditioner for a vehicle expands to a low-temperature, low-pressure refrigerant by adiabatically expanding a compressor that compresses refrigerant flowing through a refrigeration cycle and discharges it as a gas refrigerant of high temperature and high pressure, a condenser that condenses gas refrigerant, and a condensed liquid refrigerant. The apparatus includes an evaporator that exchanges heat with air in the vehicle interior by evaporating the refrigerant. At this time, the refrigerant evaporated in the evaporator is returned to the compressor again to circulate the refrigeration cycle. In addition, the evaporator performs a heat exchange between the refrigerant flowing in the cooling circuit and the air in the vehicle cabin.

Normally, depending on the size of the heat load or the cooling load, since the amount of heat of the air passing through the evaporator is transmitted to the refrigerant flowing through the evaporator, the refrigerant gas pressure at the outlet or downstream side of the evaporator reflects the size of the cooling load.

The compressor used in such a cooling circuit uses the power of the engine whose rotation speed is changed according to the driving state, and thus it is impossible to control the discharge capacity through the speed adjustment, and thus, recently, the proper cooling capacity is irrespective of the engine speed. In order to obtain a variable-capacity compressor that can vary the discharge capacity of the refrigerant, a trend has been applied.

The variable-capacity compressor includes a pressure regulating valve for regulating the refrigerant discharge amount, and the pressure regulating valve at this time includes a mechanical pressure regulating valve driven by mechanical force and an electronic pressure regulating valve driven by electrical force.

Recently, an electronic pressure regulating valve is mainly used, which is called an electronic control valve (ECV).

Usually, the variable capacity compressor has a slope change of the swash plate by the control of an electronic control valve, and the refrigerant discharge amount of the compressor is determined according to the slope of the swash plate.

Such an electronic control valve is designed to control the pressure (Pc) inside the crankcase by controlling the amount of introduction of the refrigerant by introducing a portion of the refrigerant at the discharge pressure (Pd) discharged from the discharge chamber into the crankcase.

In the case of such an electronic control valve, recently, a method of controlling the capacity by varying the pressure of the crankcase according to the condition of the air conditioner operation, that is, when the cooling load is large and when the cooling load is small, has been proposed.

However, the conventional ECV has a problem in that the swash plate angle control failure due to wear occurs when the frequency of opening and closing in the Pd-Pc flow path in the ECV increases. That is, the load of the solenoid hits the valve body, and there is a problem in that the increase in the amount of Pd-Pc leak due to abrasion is inevitable and the cooling performance is deteriorated.

Republic of Korea Patent Application No. 10-1999-023130

An embodiment of the present invention is to provide an electronic control valve of a variable-capacity compressor capable of improving cooling performance by solving a problem in which a solenoid rod hits the valve body to cause wear to overcome the problems of the prior art. do.

According to an aspect of the present invention, in an electronic control valve (ECV) of a variable displacement compressor, a rod is longitudinally driven by a magnetic field formed in a valve body and coil in which a discharge pressure port and a crankcase pressure port are formed in a hollow cylinder shape. It may include a solenoid to reciprocate to open and close the discharge pressure port and the crankcase pressure port of the valve body, the rod is moved to the inside of the valve body may be mounted on the O-ring is in contact with the valve body.

A valve step may be formed inside the valve body such that the O-ring is mounted.

The step may be formed between the discharge pressure port and the crankcase pressure port.

A plurality of discharge holes may be perforated in the discharge pressure port of the valve body.

The discharge hole may have a rectangular shape.

The discharge holes may be formed spaced apart from each other in the circumferential direction.

The discharge hole may be opened and closed by reciprocating movement of the rod.

In the rod, a rod step may be formed corresponding to a portion where the O-ring is mounted.

The outer diameter of the body of the rod may be the same size as the inner diameter of the discharge pressure port forming portion of the valve body.

The outer diameter of the end of the rod may be smaller than the inner diameter of the crankcase pressure port forming portion of the valve body.

According to one embodiment of the present invention, the electronic control valve of the variable displacement compressor may provide an effect of improving cooling performance and fuel efficiency by solving a problem in which a load of the solenoid strikes the valve body to cause wear.

In addition, it is possible to provide the effect of improving the quality by solving the reduction in life caused by abrasion by the rod of the solenoid hitting the valve body.

1 is a schematic diagram of an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.
2 is a schematic diagram of an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.
3 is a schematic diagram showing an example of sealing an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.
4 is a schematic diagram showing an operation example of an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and the present invention is not limited thereby. In addition, matters expressed in the accompanying drawings may be different from those actually implemented in schematic drawings to easily describe embodiments of the present invention.

When an element is referred to as being connected to or connected to another element, it should be understood that other elements may exist in the middle, although they may be directly connected or connected to the other element.

And "connection" herein includes direct and indirect connections between one member and another member, and may refer to all physical connections such as adhesion, attachment, fastening, bonding, and bonding.

In addition, expressions such as'first, second', etc. are expressions used only for distinguishing a plurality of components, and do not limit the order or other features between components.

Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprises" or "haves" are intended to mean that there are features, numbers, steps, operations, components, parts or combinations thereof described in the specification, one or more other features or numbers, It can be interpreted that steps, operations, components, parts or combinations thereof can be added.

1 is a schematic diagram of an electronic control valve of a variable displacement compressor according to one embodiment of the present invention, and FIG. 2 is a schematic diagram of an electronic control valve of a variable displacement compressor according to one embodiment of the present invention, and FIG. 3 is It is a schematic diagram showing a sealing example of an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.

Referring to FIGS. 1 to 3 together, the electronic control valve 1000 of the variable displacement compressor according to an embodiment of the present invention includes a discharge pressure port in a hollow cylindrical shape in the electronic control valve (ECV) of the variable displacement compressor. Pd) and the crankcase pressure port (Pc) is formed by the valve body 100 and the magnetic field formed in the coil 210 to reciprocate in the longitudinal direction of the discharge pressure port (Pd) of the valve body (100) And a solenoid 200 that opens and closes the crankcase pressure port Pc, and the rod 210 moves to the inside of the valve body 100 to contact the valve body 100 with an O-ring 300. ) Is mounted.

In one specific example, a valve step 120 is formed inside the valve body 100 so that the O-ring 300 is mounted. That is, the valve step 120 is formed between the discharge pressure port Pd and the crankcase pressure port Pc.

In addition, a plurality of discharge holes 140 are perforated in the discharge pressure port Pd of the valve body 100, and the discharge hole 140 is preferably a rectangular shape along the longitudinal direction of the valve body 100. Do.

Here, the discharge holes 140 are spaced apart from each other in the circumferential direction, and the discharge holes 140 are opened and closed by reciprocating movement of the rod 210.

According to the present invention, the rod 210 has a rod step 220 corresponding to a portion where the O-ring 300 is mounted.

Therefore, the outer diameter D3 of the body 211 of the rod 210 is the same as the inner diameter D1 of the discharge pressure port Pd formation portion of the valve body 100, and the end 212 of the rod 210 The outer diameter D4 is preferably smaller in size than the inner diameter D2 of the crankcase pressure port Pc forming portion of the valve body 100.

4 is a schematic diagram showing an operation example of an electronic control valve of a variable displacement compressor according to an embodiment of the present invention.

Referring to FIG. 4 together with FIGS. 1 to 3 to describe the operating relationship of the electronic control valve of the variable capacity compressor according to an embodiment of the present invention, the electronic control valve 1000 of the variable capacity compressor is an electronic of the variable capacity compressor. In the control valve (ECV), the rod 210 is longitudinally driven by the magnetic field formed in the valve body 100 and the coil in which the discharge pressure port Pd and the crankcase pressure port Pc are formed in a hollow cylindrical shape. It includes a solenoid 200 to open and close the discharge pressure port (Pd) and the crankcase pressure port (Pc) of the valve body 100 by reciprocating movement, the rod 210 is the inside of the valve body (100) When the O-ring 300 is mounted on a portion in contact with the valve body 100 by moving, and the rod 210 seals the discharge pressure port Pd, the crankcase pressure at the discharge pressure port Pd The refrigerant does not flow to the port (Pc). In addition to this, the O-ring 300 is sealed to prevent the refrigerant from leaking from the discharge pressure port Pd to the crankcase pressure port Pc. In this case, the swash plate angle forms the maximum angle.

Subsequently, when the rod 210 is retracted to the rear, the discharge pressure port Pd is opened and the discharge pressure port Pd is proportional to the size of the opened pressure, and the crankcase pressure port is discharged from the discharge pressure port Pd. Refrigerant flows to (Pc). In this case, the swash plate angle forms an angle corresponding to the size at which the discharge pressure port Pd is opened.

Subsequently, when the rod 210 reaches the maximum retracted position to the rear, the discharge pressure port Pd is fully opened and the maximum amount of refrigerant flows from the discharge pressure port Pd to the crankcase pressure port Pc. do. In this case, the swash plate angle forms a minimum angle.

In general, the cooling device is a compressor that compresses the refrigerant into a high-temperature, high-pressure gas state, an evaporator that evaporates while the refrigerant supplied from the expansion valve absorbs the surrounding heat, and discharges the heat absorbed by the evaporator while cooling with external air. The condenser in which the refrigerant is liquefied, the receiver that dissipates heat from the condenser so that the refrigerant in the liquid is temporarily stored instead of flowing into the expansion valve, and the air inside the vehicle is sent to the evaporator for heat exchange. It has a structure equipped with a blower that sends a cold breeze into the cabin.

The compressor of the automobile cooling device is configured to compress the refrigerant in the low-temperature and low-pressure gaseous state discharged from the evaporator into a high-temperature and high-pressure gaseous state, and is configured to discharge the refrigerant to the condenser. In other words, it is structured to compress the refrigerant.

The swash plate angle is controlled to regulate and send the refrigerant from the discharge pressure port (Pd) to the crankcase pressure port (Pc). With the precise control of the swash plate angle, the discharge pressure port (Pd) and the crankcase pressure port (Pc) are precisely controlled. Control is required.

Therefore, the electronic control valve of the variable displacement compressor according to the present invention solves the problem of abrasion caused by the load of the solenoid hitting the valve body, thereby improving the cooling performance and fuel efficiency, and also reducing the lifespan caused by wear. Therefore, it is possible to provide an effect of improving quality.

Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, the above-described embodiments are merely the most preferred embodiments selected for the understanding of the skilled person among various possible embodiments, and the technical spirit of the present invention is limited or limited only by the presented embodiments. Rather, it is revealed that various changes, additions, and changes are possible within a range that does not depart from the technical spirit of the present invention, and that other exemplary embodiments are possible. The scope of the present invention is indicated by the scope of the claims, which will be described later, rather than the detailed description, and all the modified or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted. In addition, the inventor has defined terms or words used in the present specification and claims based on the principle that the concept of terms can be properly defined in order to explain his or her invention in the best way. It should not be interpreted as meaning only. In addition, the order of the components described in the above-described process does not necessarily have to be performed in a time-series order, and even if the order of performance of each component and step is changed, these processes may fall within the scope of the present invention. Yes, of course.

100: valve body 120: valve step
140: discharge hole 200: solenoid
210: rod 211: body
212: end 220: step
300: O-ring 1000: electronic control valve
Pc: Crankcase pressure port Pd: Discharge pressure port

Claims (10)

In the electronic control valve (ECV) of a variable capacity compressor,
A valve body in which a discharge pressure port and a crankcase pressure port are formed in a hollow cylindrical shape; And
A solenoid that reciprocates the rod in the longitudinal direction by a magnetic field formed in the coil to open and close the discharge pressure port and the crankcase pressure port of the valve body;
Including,
An electronic control valve of a variable displacement compressor, characterized in that an O-ring is mounted on a portion where the rod moves inside the valve body and is in contact with the valve body. According to claim 1,
An electronic control valve of a variable-capacity compressor, wherein a valve step is formed inside the valve body so that the O-ring is mounted. According to claim 2,
The step is an electronic control valve of a variable displacement compressor, characterized in that formed between the discharge pressure port and the crankcase pressure port. According to claim 1,
Electronic control valve of a variable capacity compressor, characterized in that a plurality of discharge holes are perforated in the discharge pressure port of the valve body. The method of claim 4,
The discharge hole is an electronic control valve of a variable capacity compressor, characterized in that the rectangular shape. The method of claim 4,
The discharge hole is an electronic control valve of a variable capacity compressor, characterized in that spaced apart from each other in the circumferential direction. The method of claim 4,
The discharge hole is an electronic control valve of a variable capacity compressor, characterized in that opened and closed by the reciprocating movement of the rod. According to claim 1,
The rod is a solenoid control valve of a variable capacity compressor, characterized in that the step of the rod is formed corresponding to the portion where the O-ring is mounted. According to claim 1,
The outer diameter of the body of the rod is the electronic control valve of the variable capacity compressor, characterized in that the same as the inner diameter of the discharge pressure port forming portion of the valve body. According to claim 1,
The electronic control valve of the variable capacity compressor, characterized in that the outer diameter of the end of the rod is smaller than the inner diameter of the crankcase pressure port forming portion of the valve body.

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