KR100986942B1 - Variable displacement swash plate compressor - Google Patents

Abstract

The present invention relates to a variable displacement swash plate type compressor, comprising: a housing, a drive shaft rotatably installed in the housing, a swash plate installed to change an inclination angle while rotating in the housing, and transmitting power to the swash plate. In the variable displacement swash plate type compressor comprising a lug plate, a gas support spring supported between the lug plate and the front surface of the swash plate, and a piston reciprocating by sliding the swash plate, the swash plate is formed on the outer peripheral surface of the drive shaft. To move along the step by the elastic force of the stepped portion having a step so that the step is generated, the snap ring mounted on the stepped portion spaced apart from the rear surface of the swash plate and the return spring supported by the snap ring on the stepped portion. Mounted on the stepped jaw at the maximum movement in the direction toward the swash plate. Only takes up the movement of the said opposite direction, characterized by comprising a return takes a ring the other end to the retaining ring.

According to the present invention, since the one end of the return ring supports the rear of the swash plate and the other end is caught by the snap ring in the situation where the swash plate should maintain the minimum inclination angle, the swash plate can maintain the minimum inclination angle regardless of the spring constant manufacturing deviation of the return spring. Make sure

Swash plate compressor, return ring, return spring, snap ring, spring constant, step, step

Description

Variable displacement swash plate compressor {VARIABLE DISPLACEMENT SWASH PLATE COMPRESSOR}

The present invention relates to a variable displacement swash plate compressor, and more particularly, to accurately maintain the angle when the minimum inclination angle of the swash plate is maintained. The present invention relates to a variable displacement swash plate compressor that can be accurately returned.

In general, the swash plate type compressor, which is widely used as a compressor of an automotive air conditioner, has a disk-shaped swash plate having a fixed inclination angle fixedly installed on a drive shaft receiving engine power, rotated by a drive shaft, and rotated by the rotation of the swash plate. A plurality of pistons installed through a shoe along a circumference of the plurality of pistons is configured to suck, compress and discharge the refrigerant gas by linearly reciprocating the inside of the plurality of cylinder bores formed in the cylinder block.

In particular, in recent years, the inclination angle of the swash plate is changed according to the change of the heat load to achieve precise temperature control by controlling the feed amount of the piston, and the inclination angle is continuously changed to reduce the sudden torque fluctuation of the engine caused by the compressor, thereby making the vehicle more comfortable to ride. A variable-capacity swash plate type compressor capable of improving the efficiency has been proposed.

Hereinafter, a variable displacement swash plate compressor according to the prior art will be described with reference to FIG. 1.

As shown in Fig. 1, the variable displacement swash plate compressor of the prior art has a cylinder block 11 having a plurality of cylinder bores 10 formed in parallel in the longitudinal direction on an inner circumferential surface thereof and constituting the outside of the compressor; A front housing 13 disposed at the front end of the cylinder block 11 to form a swash plate chamber 12, and a drive shaft 14 rotatably supported by the cylinder block 11 and the front housing 13; And a lug plate 15 fixed to the drive shaft 14 in the swash plate chamber 12 of the front housing 13, a suction chamber 16 and an discharge chamber 17 formed therein, and the cylinder A rear housing 18 disposed at the rear end of the block 11, a swash plate 19 formed in a circular plate shape while the inclination angle may be changed while rotating by the lug plate 15, and the lug plate 15. ) And the front of the swash plate 19 It comprises a gas spring (20), and a piston (22) which is slidably coupled to the swash plate (19) via the shoe (21) and is reciprocally movable in the cylinder bore (10). have.

On the other hand, the valve plate 23 provided between the rear housing 18 and the cylinder block 11 has a suction port 24 and a cylinder bore 10 and a discharge chamber communicating the cylinder bore 10 and the suction chamber 16. Discharge ports 25 communicating with 17 are formed, respectively.

In addition, the suction port (24) and the discharge port (25) and the suction valve (not shown) and the discharge valve for opening and closing the suction port 24 and the discharge port 25 by the pressure change according to the reciprocating motion of the piston 22 (Not shown) are provided respectively.

In addition, a return spring 26 is mounted on the drive shaft 14 in the direction in which the rear surface of the swash plate 19 faces.

The compressor having such a configuration receives refrigerant by an external power generator, for example, an automobile engine, and the like, and thus the refrigerant is compressed inside the drive shaft 14 and the swash plate 19. In addition, the compressor is not provided with a separate clutch to control the power of the vehicle engine transmitted to the drive shaft (14).

On the other hand, the compressor is a component of the air conditioning system, the user may or may not operate the air conditioning system as needed. However, since the drive shaft 14 of the compressor rotates at all times regardless of the on / off of the air conditioning system, the inclination angle of the swash plate 19 is 0 °, which is the minimum inclination angle, especially when the air conditioning system is turned off. It is important to maintain the state so that the refrigerant is not compressed.

Therefore, when the air conditioning system is turned off, the gas spring 20 and the return spring 26 respectively cover the front and rear surfaces of the swash plate 19 so that the inclination angle of the swash plate 19 is maintained at the minimum inclination angle, 0 °. In the pressing state, that is, the swash plate 19 is supported by the balance of the pressing forces on both sides.

However, the springs may cause a manufacturing deviation of the spring constant in the manufacturing process, and for this reason, the swash plate 19 does not accurately maintain the minimum inclination angle of 0 °, resulting in the compression of the refrigerant.

Therefore, the piston 22 hits the intake valve (not shown) and the discharge valve (not shown) to generate noise due to the blow.

In addition, the free end of the return spring 26 is sandwiched between the outer circumferential surface of the drive shaft 14 and the swash plate 19 while the swash plate 19 is inclined and rotated normally while the inclination angle is changed to the minimum inclination angle according to the stop signal of the air conditioning system. Discarding phenomenon occurred.

In this state, the inclination angle of the swash plate 19 is returned to the limit angle from the minimum inclination angle even when the restart signal of the air conditioning system is transmitted and the pressure inside the swash plate chamber 12 is controlled by a control valve (not shown) not shown. It is difficult or severely impossible to compress the refrigerant of the compressor does not occur normally occurs.

In this case, since the compressor has to be repaired or replaced, there is an additional cost for repair and replacement.

The minimum inclination angle of the swash plate 19 refers to the inclination angle between the drive shaft 14 and the swash plate 19 to prevent the refrigerant from being compressed in the compressor, and the limit angle is the swash plate 19 having the minimum inclination angle. It refers to the lowest angle that allows a normal tilt rotation, that is, the lowest tilt angle when the tilt angle rotates normally while the tilt angle is variably changed.

An object of the present invention is to solve the above problems, when the operation of the air conditioning system having a compressor as a component, the spring constant of the springs for supporting the swash plate, even if the manufacturing deviation occurs during the manufacturing process It is to provide a variable displacement swash plate compressor to maintain a state with exactly the minimum inclination angle.

In addition, another object of the present invention is to provide a variable displacement swash plate compressor which allows the inclination angle of the swash plate to be changed from the minimum inclination angle to the limit angle quickly and accurately when the air conditioner system is restarted.

The variable displacement swash plate type compressor of the present invention, which is designed to achieve the above object, is provided with a housing, a drive shaft rotatably installed in the housing, and a tilt angle changeable while rotating in the housing. A variable displacement swash plate type compressor comprising a swash plate, a lug plate for transmitting power to the swash plate, a gusset spring supported between the lug plate and the front surface of the swash plate, and a piston reciprocating by sliding with the swash plate. To

A stepped portion formed on an outer circumferential surface of the drive shaft, the stepped portion having a stepped portion to generate a stepped portion;

A snap ring mounted to the step portion spaced apart from the rear surface of the swash plate; And

The stepped portion is mounted to move along the stepped portion by the elastic force of the return spring supported by one side of the snap ring, and when the maximum movement in the direction toward the swash plate is caught on one end and the maximum movement in the opposite direction It characterized in that it comprises a return ring is the other end to the snap ring.

And, the one end of the swash plate side of the return ring is characterized in that the flange is formed to protrude along the edge.

In addition, the return spring is mounted on the outer circumferential surface of the return ring, the protruding length of the flange is characterized in that greater than the thickness of the return spring wire constituting the return spring.

According to the variable displacement swash plate compressor according to the present invention described above, in the situation where the swash plate should maintain the minimum inclination angle, one end of the return ring supports the rear side of the swash plate and the other end is caught by the snap ring, and thus the spring constant manufacturing deviation of the return spring is reduced. Regardless, there is an effect that allows the swash plate to maintain the minimum inclination angle.

In addition, when the inclination angle of the swash plate changes from the minimum inclination angle to the limit angle, the flange of the return ring is caught on the stepped portion so that the inclination angle of the swash plate is accurately limited by the elastic force of the return spring and the support of the back of the swash plate of the flange. There is an effect that turns into.

In addition, by forming a flange protruding at one end of the return ring, when the inclination angle of the swash plate maintains the minimum inclination angle, the rear side of the swash plate is more stably supported, and when the return angle is returned to the limit angle, the free end of the return spring is driven. It is possible to prevent the phenomenon between the outer circumferential surface and the swash plate.

In addition, when the minimum inclination angle of the swash plate is maintained, noise can be prevented from being generated by the piston striking the intake valve and the discharge valve, thereby preventing consumer complaints from being caused by the noise.

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

Figure 2 is a cross-sectional view showing a variable displacement swash plate compressor according to an embodiment of the present invention, Figure 3 is an enlarged view showing part A of Figure 2 in a state where the swash plate has a minimum inclination angle in an embodiment of the present invention, 4 is an enlarged view showing part A of FIG. 2 in a state where the swash plate is returned to the limit angle in the embodiment of the present invention.

A variable displacement swash plate compressor (hereinafter referred to as a compressor) according to an embodiment of the present invention, as shown in Figure 2, has a plurality of cylinder bores (110a) formed in parallel in the longitudinal direction on the inner peripheral surface and the compressor A cylinder block 110 constituting the outside of the cylinder, a front housing 120 disposed at the front end of the cylinder block 110 to form a swash plate chamber 120a, the cylinder block 110 and the front housing 120; A drive shaft 140 rotatably supported by the shaft), a lug plate 170 fixed to the drive shaft 140 in the swash plate chamber 120a of the front housing 120, and a suction chamber 132 therein. ) And the discharge chamber 133 is formed, and the rear housing 130 and the lug plate 170, which is disposed at the rear end of the cylinder block 110, the inclination angle can be changed while rotating in the circular plate shape Swash plate 150 formed with, the lug The gas spring 160 supported between the plate 170 and the front surface of the swash plate 150 and the swash plate 150 are slidably coupled to each other via the shoe 301, and the cylinder bore 110a is coupled to the swash plate 150. It is configured to include a piston 300 that is accommodated reciprocating movement within).

In addition, a suction chamber 132 and a discharge chamber 133 are formed in the rear housing 130, respectively, and the valve plate 131 has a suction port 131a for communicating the cylinder bore 110a and the suction chamber 132. And an outlet 131b for communicating the cylinder bore 110a and the discharge chamber 133, respectively.

In addition, the suction port 131a and the discharge port 131b formed in the valve plate 131 may be suctioned to open and close the suction port 131a and the discharge port 131b by a pressure change caused by the reciprocating motion of the piston 300. A valve (not shown) and a discharge valve (not shown) are provided respectively.

On the other hand, the sleeve 400 is installed between the drive shaft 140 and the inner surface of the insertion hole (150a) of the swash plate 150, so that the swash plate 150 is not inclined to rotate in direct contact with the drive shaft 140 (swash plate ( At the same time to prevent abrasion of the 150) smooth rotation is made.

The drive shaft 140 of the compressor described above is rotated by transmitting its power through an external power source, for example, a power transmission means such as a belt and a pulley from an engine of a vehicle.

An electronic clutch may be mounted between the engine and the drive shaft to intermittently transmit the power of the engine to the drive shaft.

However, the addition of the electronic clutch causes an increase in the total weight of the compressor, an increase in the manufacturing cost, and the disadvantage that power consumption for operating the electronic clutch occurs.

The compressor in the embodiment of the present invention is a compressor in which the electronic clutch is omitted, and the drive shaft 140 of the compressor is always in a state in which the power is transmitted when the engine generates power.

The compressor is one component constituting the air conditioner system. The air conditioner system can be turned on or off as needed. In this case, the compressor is compressed or prevented.

In such an off operation of the air conditioner system, there is a need to prevent the refrigerant compression in the compressor from occurring and at the same time minimize the required power of the compressor to reduce the waste of power generated in the engine.

That is, the inclination angle of the swash plate 150 and the driving shaft 140, that is, the inclination angle of the swash plate to be minimized, specifically, the inclination angle of the swash plate 150 should be 0 °, that is, the minimum inclination angle.

Therefore, the swash plate 150 maintains the rotation state due to the power transmission of the engine, but prevents the refrigerant from being compressed by preventing the linear reciprocation of the piston 300 and thus, the phase of the refrigerant circulating in the air conditioning system. The change prevents the cool air from being discharged to the indoor space of the vehicle through the evaporator.

As described above, when the air conditioner system is turned on while the inclination angle of the swash plate 150 is the minimum inclination angle, the pressure inside the swash plate chamber 120a is reduced through a control valve (not shown). The swash plate 150 should be rotated to a predetermined or more inclined state.

In this case, the inclination angle is changed by adjusting the pressure of the swash plate chamber 120a in a state where the inclination angle is the minimum inclination angle, and the limit angle that is the minimum inclination angle for generating a refrigerant compression capacity of an appropriate compressor, approximately the The angle of inclination is to be 2 to 2.5 °. However, the above numerical values are not necessarily limited.

When the inclination angle reaches the limit angle, the inclination angle of the swash plate 150 is restored by the pressure reaction inside the swash plate chamber 120a and the discharge reaction force due to the discharge of the refrigerant to the discharge chamber 133. Since the inclination angle of 150 can be easily adjusted, it is important to allow the swash plate to quickly change from the state having the minimum inclination angle 0 ° to the state having the limit angle.

Hereinafter, a configuration in which the above-described swash plate 150 maintains a minimum inclination angle when the air conditioner system is turned off, and the swash plate 150 changes quickly and accurately to a state having a limit angle when the air conditioner system is reactivated will be described. Shall be.

In the exemplary embodiment of the present invention, as shown in FIGS. 3 and 4, the stepped portion 190 is formed in the outer circumferential surface of the drive shaft 140 in a predetermined depth in the center direction of the drive shaft 140 to generate a step. A stepped 191 is formed between the stepped part 190 and the driving shaft 140.

The stepped portion 190 is preferably formed on the drive shaft 140 in the direction that the rear surface (後面) of the swash plate 150.

In addition, a snap ring 210 is mounted on the stepped portion 190 spaced apart from the rear surface of the swash plate 150.

Between the stepped 191 and the snap ring 210 is spaced a predetermined distance, the separation distance after the reactivation of the air conditioning system, the inclination angle of the swash plate 150 is quickly limited by the return ring 200 to be described later at the minimum inclination angle This value is calculated to fluctuate to an angle.

On the other hand, the stepped portion 190 is provided with a return spring 180 is supported by one side by the snap ring 210, and also to move along the stepped portion 190 by the elastic force of the return spring 180 Return ring 200 is installed.

3 and 4, the return spring 180 is mounted on the outer circumferential surface of the return ring 200.

In addition, at one end of the swash plate 150 toward the swash plate 150 of the return ring 200 in order to be able to maintain the inclination angle stably without the fine movement of the inclination angle in a state where the inclination angle is at least 0 °. The flange 201 protrudes along the edge so as to contact the rear surface of the swash plate 150.

Therefore, since the area supporting the rear surface of the swash plate 150 is increased, it becomes easier to more stably maintain the state in which the swash plate 150 has a minimum inclination angle.

In addition, when the swash plate 150 has a predetermined inclination angle and is converted into a state having a minimum inclination angle in a state of inclined rotation normally, the free end of the return spring wire constituting the return spring 180 due to the flange 201 is the swash plate ( The phenomenon that is caught between the 150 and the drive shaft 140 is prevented.

In order to further increase the aforementioned effect, the protruding length of the flange 201 is greater than the thickness of the return spring wire constituting the return spring 180 so that the return spring 180 returns the return ring 200. It is desirable to be fixed between the flange 201 and the snap ring 210 without leaving out.

On the other hand, when the swash plate 150 is changed to a state where the swash plate 150 has a limit angle of 2 ~ 2.5 ° by adjusting the pressure of the swash plate chamber 120a in a state where the swash plate 150 has a minimum inclination angle There is a need to easily react to the pressure fluctuations of the swash plate chamber 120a so that the inclination angle thereof changes easily.

Specifically, the spring constant of the return spring 180, that is, the elastic modulus is greater than the spring constant of the gas spring 160 so that the swash plate pressing force of the return spring 180 is larger than the swash plate pressing force of the gas spring 160. It is preferable.

That is, as shown in FIG. 3, the gas spring 160 presses the front surface of the swash plate 150 so that the swash plate 150 has a minimum inclination angle. If the spring constant of the return spring 180 is If it has a value smaller than the spring constant of the gas spring 160, it is not easy to return the minimum inclination angle of the swash plate 150 to the limit angle even by adjusting the elastic force of the return spring 180 and the pressure of the swash plate chamber 120a. do.

Hereinafter, the operation of the snap ring 210, the return spring 180 and the return ring 200 will be described in more detail.

First, when the air conditioner system stops the operation of the system as necessary in the normal operation state, the main controller (not shown) increases the pressure in the swash plate chamber 120a through a control valve (not shown) and the swash plate 150 ) Will reduce the angle of inclination.

Then, the swash plate 150 gradually decreases the inclination angle so that at any moment, the swash plate 150 has a minimum inclination angle (near 0 °). In this case, the rear surface of the swash plate 150 is shown in FIG. The return ring 200 is pressed and moved in contact with the flange 201, and the other end of the return ring 200 is caught by the snap ring 210 and no longer moved at the maximum movement.

Therefore, the swash plate 150 is pressurized by the swash plate 150 of the gas spring 160 and the return spring 180, and the other end of the return ring 200 is caught by the snap ring 210 of the flange 201. Due to the back support of the swash plate 150, the inclination angle is rotated by the rotation of the drive shaft 140 in a state having the minimum inclination angle.

Next, as described above, when the air conditioner system is restarted as needed while the air conditioner system is turned off, the pressure in the swash plate chamber 120a is reduced through a control valve (not shown). The tilt angle of 150 is increased.

Then, the swash plate 150 is momentarily oscillated due to the pressure drop of the swash plate chamber 120a to form an inclination angle exceeding the minimum inclination angle. In this case, the return ring 200 is rotated due to the elastic force of the return spring 180. As shown in the figure, the swash plate 150 is moved toward the upper end and at one end thereof is caught by the stepped portion 191 of the stepped portion 190 and is no longer moved.

Therefore, the inclination angle of the swash plate 150 may be changed to a limit angle by the pressure decrease of the swash plate chamber 120a and the elastic force of the return spring 180. Thereafter, the inclination angle of the swash plate 150 is more easily adjusted by the pressure control of the swash plate chamber 120a and the discharge reaction force due to the discharge of the refrigerant.

In the embodiment of the present invention, in the case of maintaining the minimum inclination angle of the swash plate 150 or returning to the limit angle, the stepped portion 190 and the snap ring 210 irrespective of the spring constant manufacturing deviation of the return spring 180. By the above-described effect by the configuration of the return ring 200 and the like, it is possible to maintain an accurate minimum inclination angle and return to an accurate limit angle.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. Or modifications may be possible.

1 is a cross-sectional view showing a variable displacement swash plate compressor according to the prior art.

Figure 2 is a cross-sectional view showing a variable displacement swash plate compressor according to an embodiment of the present invention.

Figure 3 is an enlarged view showing a portion A of Figure 2 in a state where the swash plate has a minimum inclination angle in an embodiment of the present invention.

Figure 4 is an enlarged view showing part A of Figure 2 in a state where the swash plate is returned to the limit angle in an embodiment of the present invention.

** Description of symbols for the main parts of the drawing ***

110a: cylinder bore 110: cylinder block

120a: swash chamber 120: front housing

130: rear housing 131: valve plate

131a: inlet 131b: outlet

132: suction chamber 133: discharge chamber

140: drive shaft 150: swash plate

150a: insertion hole 160: gas spring

170: lug plate 180: return spring

190: step 191: step

200: return ring 201: flange

210: snap ring 300: piston

301: shoe 400: sleeve

Claims (3)

A housing, a drive shaft rotatably installed in the housing, a swash plate installed to change the inclination angle while rotating in the housing, a lug plate transmitting power to the swash plate, a front surface of the lug plate and the swash plate A variable displacement swash plate type compressor comprising a gas spring supported therebetween and a piston reciprocating by sliding. A stepped portion formed on an outer circumferential surface of the drive shaft, the stepped portion having a stepped portion to generate a stepped portion; A snap ring mounted to the step portion spaced apart from the rear surface of the swash plate; And The stepped portion is mounted to move along the stepped portion by the elastic force of the return spring supported by one side of the snap ring, and when the maximum movement in the direction toward the swash plate, one end is caught in the stepped portion and the maximum in the opposite direction of the swash plate. When the movement includes the return ring on the other end of the snap ring, When the return ring is in close contact with the step, the inclination angle of the swash plate rotates in a state inclined to the limit angle. When the return ring is in close contact with the snap ring, the inclination angle of the swash plate rotates to maintain the minimum angle. Capacitively variable swash plate compressor characterized in that the flange is projected along the edge at one end of the swash plate side of the return ring. delete The method of claim 1, The return spring is mounted on the outer circumferential surface of the return ring, the protruding length of the flange is larger than the thickness of the return spring wire constituting the return spring, variable displacement swash plate type compressor.

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