KR20220016334A - Variable Capacity External Control Valve - Google Patents

Abstract

The present invention provides a control valve for a variable capacity compressor, comprising: a main housing in which a coil, a core and a plunger are provided; a communicating housing which is installed in front of the main housing, and in which a first communicating hole, a second communicating hole and a third communicating hole communicating with a crank chamber, a discharge chamber and a suction chamber of the variable capacity compressor respectively are formed, a first internal space communicating with the first communicating hole is formed and a second internal space communicating with the second communicating hole and the third communicating hole and disposed between the first internal space and the main housing is formed; a bellows decompression member installed in the first internal space; a hollow valve member installed in the second internal space; and a rod installed in the core, and having one end penetrated into the valve member to be in contact with the bellows decompression member and the other end inserted into the plunger, wherein a main valve opened and closed by a selective contact with the front end of the second internal space of the communicating housing is formed and an assistant valve opened and closed by a selective contact between the bellows decompression member and the valve member is formed. The rod pushes the bellows decompression member by an action of an electromagnetic force applied to the plunger to open the assistant valve and an opening amount of the assistant valve can be adjusted by using g, which is the gap between the sleeve and repulsive stopper included in the valve member. The present invention can increase durability of the bellows decompression member.

Description

Control valve for variable capacity compressor {Variable Capacity External Control Valve}

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 capable of adjusting an opening amount of a sub-valve by using a gap between a sleeve and a repulsion stopper included in a valve member. .

Since the compressor included in the cooling system of the automobile air conditioner is directly connected to the engine through a belt, the rotation speed cannot be controlled.

Accordingly, in recent years, variable displacement compressors capable of varying the discharge amount of refrigerant in order to obtain cooling capability without being regulated by the engine speed have been widely used.

Various types of variable displacement compressors, such as a swash plate type, a rotary type, and a scroll type, are disclosed.

Among them, in the swash plate compressor, the swash plate installed so that the inclination angle is variable in the crank chamber rotates according to the rotational motion of the rotating shaft, and the piston reciprocates by the rotational motion of the swash plate.

In this case, the refrigerant in the suction chamber is sucked into the cylinder by the reciprocating motion of the piston, compressed, and then discharged to the discharge chamber. will be regulated

In particular, an electromagnetic solenoid-type capacity control valve is adopted to adjust the crankcase pressure by opening and closing the valve by energization, and through this, the discharge capacity is adjusted by adjusting the inclination angle of the swash plate.

In Patent Publication No. 10-2010-0093395 (2010.08.25) of the prior art, the variable displacement control valve has a crankcase connection hole and a discharge chamber connection hole that respectively receive the crankcase pressure and the discharge chamber pressure of the compressor, respectively, are formed therein. , a valve housing formed to pass through the discharge chamber connection hole and a first guide hole crossing the crankcase connection hole, and a valve body composed of a large-diameter portion and a small-diameter portion with a jaw portion as a boundary to open and close the first guide hole inlet while reciprocating; and an electromagnetic solenoid for reciprocating the valve body by energization, a sleeve provided in a small diameter portion of the valve body and having a larger diameter than the small diameter portion, and a bellows provided at an end of the sleeve and having a coupling hole.

At this time, in the variable displacement control valve of the prior art, the sub-valve is opened and closed by selective contact between the bellows pressure reducing member and the valve member.

An object of the present invention is to provide a control valve for a variable displacement compressor capable of adjusting the opening amount of a sub-valve by using g, which is a gap between a sleeve and a repulsion stopper included in a valve member.

A control valve for a variable displacement compressor according to the present invention includes a main housing having a coil, a core, and a plunger therein, and a first installed in front of the main housing and communicating with the crank chamber, the discharge chamber and the suction chamber of the variable displacement compressor, respectively. A first communication hole, a second communication hole, and a third communication hole are formed, and a first internal space communicating with the first communication hole communicates with the second communication hole and the third communication hole, and the first internal space A communication housing having a second internal space disposed between the space and the main housing, a bellows pressure reducing member installed in the first internal space, a hollow valve member installed in the second internal space, and the core A main valve installed inside, having one end penetrating the inside of the sleeve and in contact with the bellows pressure reducing member, the other end including a rod inserted into the plunger, and opening and closing by selective contact with the front end of the second inner space of the communication housing The sub-valve is opened and closed by selective contact between the bellows pressure reducing member and the valve member, and the rod presses the bellows pressure reducing member by the action of electromagnetic force applied to the plunger to open the sub-valve.

At this time, the valve member according to the present invention divides the inner hollow into a small-diameter portion and a large-diameter portion, is provided inside the second inner space of the communication housing, and selectively linearly moves along the second inner space, the front end and the A sleeve that is spaced apart from the boundary end of the communication housing to communicate with the second communication hole hole and the first inner space of the communication housing, or a rear end is spaced apart from the core to communicate the third communication hole with the inner hollow includes

And the valve member according to the present invention includes a repulsion stopper for regulating linear motion of the sleeve backward while being accommodated in a large-diameter portion of the hollow inside the sleeve, and the front end of the repulsion stopper is spaced apart from the front end of the large-diameter portion of the sleeve It is preferred to be spaced apart by g.

Here, the interval g according to the present invention is preferably greater than 0, and the opening amount of the sub-valve can be adjusted by changing the interval g.

In addition, the distance g according to the present invention before the main valve is closed, the distance is maintained, and after the main valve is closed, the distance can be reduced.

In addition, when the sub-valve is closed according to the present invention, the sum of the main valve opening amount (L) and the gap g is smaller than the air gap (P), which is the distance between the plunger and the core.

The effects exhibited by the control valve for a variable displacement compressor according to the present invention are as follows.

The opening amount of the sub-valve can be adjusted by using g, which is a gap between the sleeve and the repulsion stopper included in the valve member, thereby increasing the durability of the bellows pressure reducing member.

1 is an exemplary view showing a state in which a control valve for a variable displacement compressor according to an embodiment of the present invention is provided in the compressor.
2 is a cross-sectional view showing a control valve for a variable displacement compressor according to an embodiment of the present invention.
3 is an enlarged view of the main part of a control valve for a variable displacement compressor according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention. It should be understood that there may be variations.

The present invention relates to a control valve for a variable displacement compressor capable of adjusting the opening amount of a sub-valve by using a gap between a sleeve and a repulsion stopper included in a valve member, and will be described in more detail with reference to the drawings.

First, the variable capacity swash plate compressor according to an embodiment of the present invention with reference to FIG. 1 includes a cylinder block 10 having a plurality of cylinder bores 11 formed in parallel along the longitudinal direction on an inner circumferential surface, and the cylinder block 10 It consists of a front housing 20 hermetically coupled to the front of the , and a rear housing 30 hermetically coupled to the rear of the cylinder block 10 with a valve plate 40 interposed therebetween.

A crank chamber Pc is provided inside the front housing 20, and one end of the drive shaft 50 is rotatably supported near the center of the front housing 20, while the other end of the drive shaft 50 is It passes through the crank chamber (Pc) and is supported via a bearing installed in the cylinder block (10).

In addition, a lug plate 60 and a swash plate 70 are installed around the drive shaft 50 in the crank chamber Pc.

In the lug plate 60 , a pair of power transmission support arms 62 , each having a guide hole 61 in the center, are formed to protrude integrally on one surface, and a ball is formed on one surface of the swash plate 70 . 71 is formed, and as the lug plate 60 rotates, the ball 71 of the swash plate 70 slides within the guide hole 61 of the lug plate 60. The inclination angle is variable.

In addition, the outer circumferential surface of the swash plate 70 is slidably fitted to each piston 12 via the shoe 72 .

Accordingly, as the swash plate 70 rotates in an inclined state, the pistons 12 fitted with the shoes 72 on the outer peripheral surface thereof reciprocate within each cylinder bore 11 of the cylinder block 10 . do.

In addition, a suction chamber (Ps) and a discharge chamber (Pd) are respectively formed in the rear housing (30), and each cylinder bore (40) interposed between the rear housing (30) and the cylinder block (10) 11), the suction port 41 and the discharge port 42 are respectively formed.

The refrigerant in the suction chamber Ps is sucked into the cylinder bore 11 by the reciprocating motion of the piston 12, is compressed, and discharged to the discharge chamber Pd. The pressure in the crank chamber Pc and the suction chamber ( Ps), the inclination angle of the swash plate 70 is changed according to the pressure difference in the inside, so that the discharge amount of the refrigerant is adjusted.

The variable capacity compressor adopted in an embodiment of the present invention applies an electromagnetic solenoid type variable capacity type external control valve to adjust the pressure of the crank chamber Pc by opening and closing the valve by energization, and through this, the swash plate 70 It is a method of adjusting the discharge capacity by adjusting the inclination angle.

Hereinafter, a control valve for a variable displacement compressor according to an embodiment of the present invention will be described in detail.

The control valve 100 for a variable displacement compressor according to an embodiment of the present invention with reference to FIGS. 2 to 3 includes a communication housing 110 , a valve member 120 , a main housing 130 , and a bellows pressure reducing member 140 . Including, when the air conditioner is off, the valve member 120 operates in one direction by the repulsion stopper 125 configured in the hollow of the valve member 120 to communicate with the first communication hole 113 communicating with the crank chamber and the discharge chamber. to be able to open the second communication hole 114, first, the communication housing 110 has a first internal space 111 having a large diameter with respect to the boundary end therein, and the first internal space 111 and While communicating, a second inner space 112 that is a small diameter portion having an inner diameter smaller than that of the first inner space 111 is formed.

And the first communication hole 113 receiving the crank chamber (Pc) pressure of the compressor while crossing the first internal space 111 orthogonally and crossing the second internal space 112 orthogonally of the compressor A second communication hole 114 receiving the pressure of the discharge chamber Pd and a third communication hole 115 receiving the pressure of the suction chamber Ps of the compressor while crossing the second internal space 112 orthogonally are formed. do.

In addition, a valve member 120 is provided inside the second inner space 112 of the communication housing 110 , and the valve member 120 moves in a straight line along the inside of the second inner space 112 and flows through the passage. open and close selectively.

Here, the valve member 120 selectively opens and closes the flow path by closely or spaced apart the front end or the rear end from the opponent, a detailed description will be described below again.

And a main housing 130 is connected to the rear of the communication housing 110, and the main housing 130 generates electromagnetic force by energization of power applied from the outside to move the valve member 120 in a straight line.

Here, a main valve (crank chamber (Pc)-discharge chamber (Pd)) that is opened and closed by selective contact with the tip of the second inner space 112 of the communication housing 110 is formed.

Looking at the main housing 130 in more detail, the main housing 130 includes a cylindrical solenoid case 131 .

At this time, the front and rear of the cylindrical solenoid case 131 are closed by a closing cap, respectively, and it is preferable that the front side closing cap forms a coupling part that can be coupled with the rear side of the communication housing 110, and the A through hole is formed in the center of the coupling part so that the core can pass therethrough.

And the rear end cap closes the rear of the solenoid case (131).

In addition, an electromagnetic coil 132 is provided on the inner surface of the solenoid case 131 so that the electromagnetic coil 132 selectively generates electromagnetic force by energization of an external power source.

The electromagnetic force generated at this time moves the plunger 133, which is provided at the rear inner center of the solenoid case 131, and moves linearly under the influence of the electromagnetic force generated from the electromagnetic coil 132.

Here, the plunger 133 linearly moves along the longitudinal direction inside the rear side of the solenoid case 131 .

And a rod 134 is coupled to the plunger 133 , wherein the rod 134 includes the front side of the rod 134 positioned at the inner center of the communication housing 110 and the inside of the solenoid case 131 . It is divided into a rear side of the rod 134 located at the center, and the rear side of the rod 134 is coupled to the center of the plunger 133 and linearly moves in association with the linear motion of the plunger 133 .

Here, a core 135 is provided at the inner center of the solenoid case 131, and the core 135 has a hollow inner center, and a guide ring (unsigned) is built in the hollow to provide a rod 134 . support

Accordingly, the rod 134 is located at the inner center of the solenoid case 131 by the core 135 and is caused by electromagnetic force generated from the electromagnetic coil 132 provided on the inner surface of the solenoid case 131. When the plunger 133 linearly moves along the longitudinal direction, it linearly moves along the hollow of the core 135 in association with it.

At this time, at the rear end of the core 135 , the plunger 133 is spaced apart by a corresponding distance to form an air gap P, and the plunger 133 is an air gap P that is a spaced distance from the core 135 . The front side of the rod 134 positioned inside the communication housing 110 forms a small diameter end 134a smaller than the diameter of the rear side, and a large diameter end 134b is formed behind it. it is preferable

In addition, a main spring 136 is provided between the core 135 and the plunger 133. The main spring 136 is a coil spring, and the rear side of the rod 134 is fitted therein, and the main spring One end of 136 is supported on the rear end of the core 135, and the other end of the opposite main spring 136 is coupled to the front end of the plunger 133, so that it is not affected by electromagnetic force due to elastic repulsion. Return the plunger to its original position.

A bellows decompression member 140 is provided at the distal end of the valve member 120 according to the above configuration, and the bellows decompression member 140 is activated by the linear motion of the rod 134 or the pressure in the suction chamber. ) selectively opens and closes the tip side.

At this time, the bellows pressure reducing member 140 includes a coil spring 141 , a bellows 142 , and a closing cap 143 , wherein the coil spring 141 is a front end provided at the front end of the communication housing 110 . It is supported by the cap (unsigned), and provides elasticity in the direction of the valve member 120 .

Here, a sub-valve (crank chamber Pc-suction chamber Ps) that is opened and closed by selective contact between the bellows pressure reducing member 140 and the valve member 120 is formed.

And the front end of the bellows 142 is fixed to the front cap of the communication housing 110, the coil spring 141 is built in, and the closing cap 143 is coupled to the rear of the bellows 142. Thus, while sealing the inside of the bellows 142, the front end of the rod 134 is in close contact with the rod 134 in response to the linear motion of the linear motion.

Therefore, the closing cap 143 of the bellows pressure reducing member 140 is in close contact with the front end of the rod 134, and the front end of the valve member 120 is moved in a linear motion in conjunction with the linear motion of the rod 134. open and close selectively.

Therefore, a main valve (Pc-Pd) that is opened and closed by selective contact with the front end of the second inner space 112 of the communication housing 110 is formed, and the bellows pressure reducing member 140 and the valve member 120 are selectively brought into contact with each other. The sub-valve Pc-Ps is opened and closed, and the rod 134 presses the bellows pressure reducing member 140 by the action of the electromagnetic force applied to the plunger 133 to open the sub-valve Pc-Ps.

The valve member 120 according to an embodiment of the present invention will be described in more detail as follows.

The valve member 120 includes a sleeve 121, a CS valve 122, a sleeve ring 123, a sleeve spring 124, a repelling stopper 125, a repelling spring 126, and a rod ring. 127. First, the sleeve 121 forms a hollow inside in a cylindrical shape. The inner hollow is divided into a small diameter part and a large diameter part, and the inner hollow of the sleeve 121 divided into a small diameter part and a large diameter part has the above The front side of the rod 134 positioned at the center of the solenoid case 131 penetrates and is in close contact with the closing cap 143 of the bellows pressure reducing member 140 .

The sleeve 121 is provided inside the second inner space 112 of the communication housing 110, and the front end and the communication housing ( 110) is spaced apart from each other to communicate with the second communication hole hole 114 and the first internal space 111 of the communication housing 110, or the rear end is spaced apart from the core 135 to make the The third communication hole 115 and the inner hollow of the sleeve 121 communicate with each other to selectively apply pressure.

And a CS valve 122 is provided at the front end of the sleeve 121, the CS valve 122 is in close contact with the closing cap 143, and the rod 134 moves the closing cap 143 in a straight line. Accordingly, the closing cap 143 and the CS valve 122 are selectively spaced apart so that the first communication hole 113 and the inner hollow of the sleeve 121 communicate with each other.

In addition, a sleeve ring 123 is press-fitted and fixed to a large-diameter portion of the hollow inside the sleeve 121, and the sleeve ring 123 is press-fitted into a large-diameter portion of the hollow inside the sleeve 121 in a ring shape, and a sleeve spring ( 124), the sleeve 121 slides along the hollow inside the communication housing 110 .

At this time, the sleeve spring 124 is accommodated in the hollow inside the sleeve 121, and the sleeve spring 124 is provided on the rear side based on the sleeve ring 123 press-fitted into the hollow inside the sleeve 121, The sleeve spring 124 supports the sleeve ring 123 , and the sleeve 121 is elastically supported toward the front by the sleeve spring 124 .

Here, the rear end of the sleeve spring 124 is supported by a fixing piece provided at the front end of the core 132 to generate an elastic force.

And a repelling stopper 125 is provided on the front side based on the sleeve ring 123 press-fitted into the hollow inside the sleeve 121, and the repelling stopper 125 selectively restricts the sleeve 121 from moving in a straight line. By doing so, it is possible to slide along the large-diameter portion of the hollow inside the sleeve 121, and the front side of the rod 134 having the large-diameter end 134b passes through the center of the repulsion stopper 125, and the rod 134 ) of the large diameter end 134b of the repulsion stopper 125 to be caught on the inner periphery of the repulsion stopper 125, so that the repulsion stopper 125 by the linear motion of the rod 134 moves along the large diameter portion of the hollow inside the sleeve 121. It slides, and with the above configuration, the repulsion stopper 125 can selectively regulate the linear motion of the sleeve 121 .

In addition, a repulsion spring 126 is provided inside the repulsion stopper 125 so that the repulsion stopper 125 can return to its original position by the elastic force or regulate the sleeve 121, and the rod The rod ring 127 is press-fitted and fixed to the small diameter end 134a formed on the front side of the 134, so that the reaction spring 126 is supported.

At this time, the front end of the repulsion stopper 125 provided in the hollow inside of the sleeve 121 is spaced apart from the front end of the large diameter part of the sleeve 121 to form an interval g, wherein the interval g is preferably greater than 0, By changing the interval g, the opening amount of the sub-valve Pc-Ps can be adjusted, so that the durability of the bellows pressure reducing member 140 is improved.

Here, the distance g is preferably maintained before the main valve (Pc-Pd) is closed, and after the main valve (Pc-Pd) is closed, the distance is reduced, and the sub-valve (Pc- Ps) When closing, the sum of the opening amount L and the gap g of the main valves Pc-Pd is preferably smaller than the air gap P that is the distance between the plunger 133 and the core 135 .

In the control valve for variable capacity compressor according to the above configuration, when the air conditioner (A/C) is OFF (there is no electromagnetic force), the high pressure suction chamber (Ps) pressure acts on the closing cap 143 of the bellows pressure reducing member 140 . Thus, when the bellows pressure reducing member 140 is contracted, a force is applied in the direction (forward) in which the sleeve spring 124 pushes the sleeve 121, but the repulsion stopper is caused by the elasticity of the repulsion spring 126 . (125) can offset the force pushing the sleeve 121 by pushing the sleeve ring 123 in the opposite direction (rearward), and is a main valve that is a flow path for communicating the crank chamber Pc and the discharge chamber Pd. (Pc-Pd) occlusion can be prevented.

In addition, when the air conditioner (A/C) (there is no electromagnetic force), the position of the repulsion stopper 125 is regulated by the sleeve ring 123 .

And when the air conditioner (A/C) is ON (with electromagnetic force), the rod 134 transmits electromagnetic force to push the repulsion stopper 125, and the resilience of the sleeve spring 124 is affected by the movement of the repulsion stopper 125. The sleeve 121 is moved by this.

In addition, the crankcase (Pc)-suction chamber (Ps) maximum flow path size is regulated by the distance between the repulsion stopper 125 and the inner bottom surface of the sleeve 121 .

Therefore, it is possible to protect the compressor by regulating the closing of the main valve (Pc-Pd) when the air conditioner is turned off in a high outdoor temperature condition.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is only exemplary, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Pc: crankcase Pd: discharge chamber Ps: suction chamber
10: cylinder block 11: cylinder bore 12: piston
20: front housing 40: valve plate 41: inlet
42: outlet 30: rear housing 50: drive shaft
60: lug plate 61: guide hole 62: support arm
70: swash plate 71: ball 72: shoe
110: communication housing 111: first inner space 112: second inner space
113: first communication hole 114: second communication hole hole 115: third communication hole
120: valve member 121: sleeve 122: CS valve
123: sleeve ring 124: sleeve spring 125: rebound stopper
126: rebound spring 127: rod ring 130: main housing
131: solenoid case 132: electromagnetic coil 133: plunger
134: rod 135: core 136: mainspring
140: bellows pressure reducing member 141: coil spring 142: bellows
143: closing cap

Claims (7)

a main housing having a coil, a core and a plunger therein;
A first communication hole, a second communication hole, and a third communication hole are installed in front of the main housing and communicate with the crank chamber, the discharge chamber, and the suction chamber of the variable displacement compressor, respectively, and communicate with the first communication hole a communication housing communicating with the first internal space, the second communication hole and the third communication hole, and having a second internal space disposed between the first internal space and the main housing;
a bellows pressure reducing member installed in the first inner space;
a hollow valve member installed in the second inner space; and
and a rod installed inside the core, one end penetrating through the inside of the valve member to contact the bellows pressure reducing member, and the other end being inserted into the plunger,
A main valve that is opened and closed by selective contact with the front end of the second inner space of the communication housing is formed, and a sub-valve that is opened and closed by selective contact between the bellows pressure reducing member and the valve member is formed,
The control valve for a variable displacement compressor, characterized in that the rod presses the bellows pressure reducing member to open the sub-valve by the action of the electromagnetic force applied to the plunger.
The method according to claim 1,
The valve member is
The inner hollow is divided into a small-diameter portion and a large-diameter portion, is provided inside the second inner space of the communication housing, and is spaced apart from the front end and the boundary end of the communication housing by selective linear motion along the second inner space, A control valve for a variable capacity compressor including a sleeve for communicating the second communication hole hole with the first inner space of the communication housing or having a rear end spaced apart from the core to communicate the third communication hole with the inner hollow .
3. The method according to claim 2,
The valve member is
and a repulsion stopper for regulating linear motion of the sleeve backward while being accommodated in a large-diameter portion of the hollow inside the sleeve,
The front end of the repulsion stopper is a control valve for a variable displacement compressor, characterized in that it is spaced apart from the front end of the large-diameter portion of the sleeve by an interval g.
4. The method according to claim 3,
The interval g is a control valve for a variable displacement compressor, characterized in that greater than zero.
5. The method according to claim 4,
A control valve for a variable displacement compressor, characterized in that the opening amount of the sub-valve is adjusted by changing the interval g.
6. The method of claim 5,
The interval g is
Before the main valve is closed, the distance is maintained, and after the main valve is closed, the distance is reduced.
7. The method of claim 6,
When the sub-valve is closed,
The control valve for a variable displacement compressor, characterized in that the sum of the main valve opening amount (L) and the gap g is smaller than the air gap (P), which is the distance between the plunger and the core.

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