KR100661361B1 - Device for retaining discharging valve of compressor - Google Patents

Abstract

The present invention relates to a discharge valve support device for a variable displacement swash plate type compressor, and aims to improve compression efficiency, cooling performance, and compressor durability by preventing the discharge reed valve of the valve unit from being lifted from the valve plate.

According to the invention, the valve unit 5 has a valve plate 51 which is sandwiched between the cylinder block 1 and the rear housing 4 and a suction which is sandwiched between the valve plate 51 and the cylinder block 1. A reed valve 52 and a discharge reed valve 53 sandwiched between the valve plate 51 and the rear housing 4. Between the discharge reed valve 53 and the rear housing 4, there is provided a valve retainer 55 whose inner end is flat and whose outer end is bent outward. The central portion of the valve retainer 55 and the central portion of the valve unit 5 are engaged by the coupling means 56. The protrusion support part 551 is formed inside the inner surface of the valve retainer 55 facing the discharge reed valve 53 so as to contact the discharge reed valve 53 at the boundary between the inner flat part and the outer bent part. A step portion 57 is formed between the valve retainer 55 and the discharge reed valve 53 in the region.

Compressors, valve retainers, compressors, compressors, compressor valves,

Description

Discharge valve support device for variable displacement swash plate compressor {DEVICE FOR RETAINING DISCHARGING VALVE OF COMPRESSOR}

1 is a cross-sectional view showing an example of a variable displacement swash plate compressor provided with a discharge valve support device according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of FIG. 1.

3 is a cross-sectional view showing an example of a conventional variable displacement swash plate compressor.

<Explanation of symbols for the main parts of the drawings>

1: cylinder block, 4: rear housing,

5: valve unit, 51: valve plate,

52: suction reed valve, 53: discharge reed valve,

55: valve retainer, 56: coupling means,

57: stepped portion, 551: protruding support

The present invention relates to an apparatus for supporting a discharge valve of a variable displacement swash plate compressor. In particular, the discharge valve is prevented from being lifted from the valve plate to prevent refrigerant leakage during the compression process of the refrigerant, thereby improving compression efficiency and durability of the compressor. A discharge valve support apparatus for a variable displacement swash plate compressor that can be improved.

The compressor constituting the air conditioner for a vehicle selectively receives the power of the engine transmitted through the pulley of the vehicle by the intermittent action of the electronic clutch, sucks the refrigerant heat exchanged from the evaporator, compresses it by the linear reciprocating motion of the piston, and condenser. It is a device to discharge.

There are various types of such compressors, and they are generally divided into reciprocating and rotary type according to the compression method and structure, and in the case of reciprocating type, crank type, swash plate type, wobble plate type, and in the case of rotary type, main rotary type and scroll type. Again, there are some of these compressors of variable capacity that can vary the compression volume.

Next, a variable displacement swash plate type compressor among the above described compressors will be described as an example.

As shown in Fig. 3, the variable displacement swash plate compressor comprises: a cylinder block 1 having a plurality of cylinder bores 11 formed in a longitudinal direction along a concentric circle; A front housing (3) installed at the front of the cylinder block (1) to form a crank chamber (31) therein; A rear housing (4) installed at a rear side of the cylinder block (1) to form a refrigerant suction chamber (41) and a refrigerant discharge chamber (42) therein; A plurality of pistons (2) inserted into the respective cylinder bores (11) of the cylinder block (1) so as to be moved back and forth and having a bridge (21) formed at the rear end thereof; A drive shaft (6) rotatably penetrating the front housing (3) and having a rear end inserted into the center of the cylinder block (1) to be rotatably supported; A rotor 61 fixed to the drive shaft 6 in the crank chamber 31 and rotating therewith; In the interior of the front housing (3) is installed around the drive shaft (6) and the edge is rotatably inserted into the bridge (21) of each piston (2) and one side of the front surface is pivotable to the rotor (61) A swash plate 7 which is hinged and rotatably installed to be rotatable with the rotor 61; It comprises a valve unit (5) which is sandwiched between the cylinder block (1) and the rear housing (4) for sucking and discharging the refrigerant. Reference numeral 8 denotes a control valve which serves to change the inclination angle of the swash plate 7 by adjusting the fluid pressure level in the crank chamber 31.

In addition, the valve unit 5 includes a valve plate 51 sandwiched between the cylinder block 1 and the rear housing 4, and a suction reed valve sandwiched between the valve plate 51 and the cylinder block 1. 52 and a discharge reed valve 53 sandwiched between the valve plate 51 and the rear housing 4. In addition, between the discharge reed valve 53 and the rear housing 4, the outer end of the discharge reed valve 53 to limit the operating region of the discharge reed (not shown) and to prevent damage to the discharge reed Is provided with a valve retainer 55, which has a central portion coupled to the valve unit 5 by means of rivets 56 or coupling bolts.

Therefore, during the suction stroke of the piston 2, the suction lead (not shown) of the suction reed valve 52 opens toward the cylinder bore 11 to open the suction port formed in the valve plate 51 to the cylinder bore 11. As the refrigerant flows in, the discharge lead of the discharge reed valve 53 is in close contact with the valve plate 51 to block the discharge port formed in the valve plate 51, thereby preventing the discharge of the refrigerant. The refrigerant sucked into the cylinder bore 11 by the suction stroke is compressed during the compression stroke of the piston 2, and the suction lead of the suction reed valve 52 is in close contact with the valve plate 51 during the compression of the refrigerant. The suction lead formed in the plate 51 is blocked, and the discharge lead of the discharge reed valve 53 opens toward the valve retainer 55 to open the discharge port formed in the valve plate 51, thereby compressing the refrigerant through the discharge port. It may be discharged to the discharge chamber 42.

However, in the conventional variable displacement swash plate type compressor as described above, the center of the valve retainer 55 is coupled to the valve unit 5 by a coupling means 56 such as a rivet or a bolt, so that the valve retainer 55 The discharge lead valve 53 is lifted toward the valve retainer 55 according to the change in the coupling force, and thus the discharge port of the valve plate 51 is not completely sealed by the discharge reed valve 53. Therefore, since the refrigerant is discharged through the discharge port after the refrigerant is sucked into the cylinder bore 11 and started to be compressed, a problem of lowering the compression efficiency and lowering the cooling performance occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and the discharge valve of a variable displacement swash plate type compressor capable of improving compression efficiency, cooling performance, and compressor durability by preventing the discharge reed valve of the valve unit from being lifted from the valve plate. To provide a support device.

In order to achieve the above object, the present invention provides a valve plate sandwiched between a cylinder block and a rear housing, a suction reed valve sandwiched between the valve plate and a cylinder block, and sandwiched between the valve plate and the rear housing. Between the discharge reed valve and the rear housing in the valve unit of the variable displacement swash plate type compressor having a discharge reed valve, a valve retainer having an inner end having a flat surface and an outer end bent outward is provided. In the discharge valve support apparatus of the variable displacement swash plate type compressor supporting the central portion and the central portion of the valve unit by the coupling means to limit the operating area of the discharge reed valve,

A protruding support portion which contacts the discharge reed valve is formed at the boundary between the inner flat portion and the outer bent portion of the inner side of the valve retainer facing the discharge reed valve, so that the valve retainer of the inner portion of the protruding support portion and the discharge reed valve are formed. It is characterized in that the stepped portion is formed.

According to the discharge valve support apparatus of the variable displacement swash plate type compressor according to the present invention configured as described above, a support point for supporting the discharge reed valve is formed by forming a protruding support portion at the boundary between the inner flat portion and the outer bent portion of the valve retainer. Unlike the moving means from the engaging means to move closer to the discharge port of the valve plate, the adhesion of the discharge reed valve to the valve plate is improved. Therefore, since the deformation amount of the discharge reed valve is minimized to prevent the refrigerant leakage from the initial compression of the refrigerant, the compression efficiency, the cooling performance, and the durability of the compressor can be improved.

Other features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.                     

For convenience, the left side in the drawing is explained in front and the right side in the drawing in the rear, and elements corresponding to those shown in FIG. 3 are denoted by the same reference numerals.

As shown in FIG. 1, reference numeral 1 denotes a cylinder block of a variable displacement swash plate type compressor, in which a plurality of cylinder bores 11 are equally spaced in the longitudinal direction along a predetermined concentric circle of the cylinder block 1. It is penetrated back and forth. In addition, the cylinder bore 11 has a piston 2 having a bridge 21 formed thereon in order to be reciprocated in turn. The front housing 3 is coupled to the front of the cylinder block 1, and the rear housing 4 is coupled to the rear of the cylinder block 1. The front housing 3, cylinder block 1 and rear housing 4 may be integrally coupled by bolts 13.

The front housing 3 is blocked in the front and opened in the rear, so that the inner space formed by the cylinder block 1 and the front housing 3 acts as a crank chamber 31.

Further, reference numeral 6 pivots the rear end portion in the center of the cylinder block 1 via a crank chamber 31 formed to be rotatably penetrating the center of the front wall surface of the front housing 3 to the inside of the front housing 3. The drive shaft 6 supported possibly is shown.

In the front of the crank chamber 31, the rotor 61 is arranged to be circumferentially arranged around the drive shaft 6. Therefore, the rotor 61 can be rotated together in accordance with the rotation of the drive shaft 6.

And the swash plate 7 is provided in the center of the crank chamber 31, and this swash plate 7 is provided so that the inclination adjustment can be carried out around the drive shaft 6. Specifically, the edge of the swash plate (7) is rotatably inserted into the bridge 21 of each piston (2), one side of the front surface of the swash plate (7) is hinged to the rotor 61 to center the hinge coupling portion As a result, the swash plate 7 can be turned back and forth. Therefore, since the swash plate 7 is hinged to the rotor 61, the swash plate 7 is inclined by rotating back and forth around the hinge coupling part according to the pressure inside the crank chamber 31 while rotating together with the rotor 61. Adjustable The inclination adjustment of the swash plate 7 may be performed by a control valve 8 installed at one side of the rear housing 4 (rear of the lower end in the drawing) to control the pressure fluctuation of the crank chamber 31. That is, the control valve 8 adjusts the pressure in the crank chamber 31 according to the suction pressure of the refrigerant returning to the compressor to change the angle of the swash plate 7 to adjust the amount of refrigerant discharged from the compressor, and the suction pressure of the compressor. Is to make this constant.

As the swash plate 7 rotates in an inclined state, the phase of the swash plate 7 with respect to each piston 2 changes continuously so that each piston 2 moves forward and backward (round trip) in the cylinder bores 11. This allows suction and compression of the refrigerant.

The suction passage and the discharge passage of the refrigerant are formed in the rear housing 4. That is, the rear housing 4 has a shape in which the front is open and the rear is blocked, and the refrigerant discharge chamber 42 is formed at the inner center thereof, and the refrigerant suction chamber 41 is surrounded by the refrigerant discharge chamber 42. Is formed.

On the other hand, between the cylinder block 1 and the rear housing 4, a valve unit 5 for controlling the suction and discharge of the refrigerant is provided, which valve unit 5 is shown in Figs. As described above, the valve plate 51 interposed between the cylinder block 1 and the rear housing 4 and the suction reed valve 52 interposed between the valve plate 51 and the cylinder block 1. And a discharge reed valve 53 interposed between the valve plate 51 and the rear housing 4.

Therefore, at the time of the suction stroke of the piston 2, the suction lead of the suction reed valve 52 opens toward the cylinder bore 11 and opens the suction port formed in the valve plate 51 to open the cylinder bore (from the refrigerant suction chamber 41). The refrigerant flows into 11 and the discharge lead of the discharge reed valve 53 is in close contact with the valve plate 51 to block the discharge port formed in the valve plate 51, thereby preventing the discharge of the refrigerant. The refrigerant sucked into the cylinder bore 11 by the suction stroke is compressed during the compression stroke of the piston 2, and the suction lead of the suction reed valve 52 is in close contact with the valve plate 51 during the compression of the refrigerant. By blocking the suction port formed on the plate 51 and opening the discharge port of the discharge reed valve 53 to the rear side, the compressed refrigerant opens the discharge port of the valve plate 51 by opening the discharge port formed on the valve plate 51. Through the refrigerant discharge chamber 42 may be discharged.

In order to limit the discharge lead operating area of the discharge reed valve 53 during the suction and discharge of the refrigerant as described above, and to prevent damage of the discharge reed, the inner end is made flat and the outer end is the outside (that is, A valve retainer 55 bent to the rear side is provided on the rear side of the discharge reed valve 53 (that is, between the discharge reed valve 53 and the rear housing 4), and the valve retainer 55 is The central portion is engaged by the coupling means 56 together with the central portion of the valve unit 5. It is preferable to use rivets as the coupling means 56, but bolts and nuts may be employed.

As described above, the center of the valve retainer 55 and the center of the valve unit 5 are coupled by the coupling means 56, so that the support point of the discharge reed valve 53 becomes the center of the discharge of the discharge reed valve 53. In order to prevent the lid from coming into close contact with the valve plate 51 so that the discharge reed valve 53 is lifted from the valve plate 51, the valve facing the discharge reed valve 53 in the present invention. A protruding support portion 551 is formed in contact with the discharge reed valve 53 at the boundary between the inner flat portion and the outer bent portion of the inner surface of the retainer 55. Therefore, a stepped portion 57 is formed between the valve retainer 55 in the inner region of the protruding support portion 551 and the discharge reed valve 53, and the supporting point of the discharge reed valve 53 is the coupling means 56 ( That is, the protrusion support portion 551 is not the center portion of the discharge reed valve 53.

Next, the operation of the valve unit of the swash plate compressor according to the present invention configured as described above will be described.

The driving force of the engine (not shown) is selectively transmitted to the drive shaft 6 of the variable displacement swash plate type compressor, and when the drive shaft 6 rotates, the swash plate 161 hinged to the rotor 61 together with the rotor 61. It also rotates with the drive shaft 6. Since the swash plate 7 is in an inclined state, the phase of the swash plate 7 continuously changes back and forth with respect to a point inside the crank chamber 31, and thus, each piston 2 coupled with the swash plate 7 causes the swash plate ( In accordance with the phase change of 7) reciprocating in each cylinder bore (11). When the suction pressure of the refrigerant to the refrigerant suction chamber 41 increases or decreases as the cooling load increases, the pressure of the crank chamber 31 is also increased and decreased by the control valve 8 to control the inclination angle of the swash plate 7 and to obtain a piston ( Smooth reciprocation of 2) is induced.                     

At the time of the suction stroke of the piston 2, the suction lead of the suction reed valve 52 of the valve unit 5 is opened toward the cylinder bore 11 by the suction pressure, and the suction port of the valve plate 51 is opened to cool the refrigerant suction chamber. The refrigerant flows into the cylinder bore 11 from the 41 and the refrigerant flowed into the cylinder bore 11 is compressed at the time of the compression stroke of the piston 2. The discharge lead is opened toward the valve retainer 55 to open the discharge port of the valve plate 51 so that the refrigerant is discharged into the refrigerant discharge chamber 42 and discharged to the outside of the compressor.

In the present invention, a support point for supporting the discharge reed valve 53 by the protrusion support 551 formed at the boundary between the inner planar portion and the outer bent portion of the valve retainer 55 is different from the conventional coupling means 56. The adhesion of the discharge reed valve 53 to the valve plate 51 is improved because it is moved to the protruding support portion 551 and is close to the discharge port of the valve plate 51. Accordingly, since the deformation amount of the discharge reed valve 53 is minimized to prevent the discharge reed valve 53 from being lifted from the valve plate 51, the refrigerant leaks through the discharge port of the valve plate 51 at the initial stage of the refrigerant compression. By preventing it, it is possible to improve the compression efficiency, cooling performance and compressor durability.

In the discharge valve support apparatus of the variable displacement swash plate compressor according to the present invention configured as described above, a support point for supporting the discharge reed valve is formed by forming a protruding support portion at the boundary between the inner flat portion and the outer bent portion of the valve plate. Since it is moved to the support, it is possible to improve the compression efficiency, cooling performance and compressor durability according to the improved adhesion of the discharge reed valve to the valve plate.

On the other hand, while the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, the field to which the invention belongs without departing from the spirit of the invention claimed in the claims below. Of course, anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

Claims (1)

A valve plate 51 sandwiched between the cylinder block 1 and the rear housing 4, a suction reed valve 52 sandwiched between the valve plate and the cylinder block, and between the valve plate and the rear housing. Between the discharge reed valve 53 and the rear housing 4 in the valve unit 5 of the variable displacement swash plate compressor having a discharge reed valve 53, the inner end is flat and the outer end is outer A valve retainer 55, which is bent toward the side, is installed, and the central portion of the valve retainer and the central portion of the valve unit are coupled by the coupling means 56 to support the variable displacement swash plate type compressor to limit the operating area of the discharge reed valve. In the discharge valve support device of The protrusion support part 551 is formed at a boundary between the inner planar portion and the outer bent part of the inner surface of the valve retainer 55 facing the discharge reed valve 53 so as to contact the discharge reed valve 53. A discharge valve support device for a variable displacement swash plate compressor, characterized in that a stepped portion (57) is formed between the valve retainer in the inner region and the discharge reed valve.

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