JPH0550084U - Variable capacity swash plate compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a variable capacity swash plate compressor with excellent productivity, cost reduction, and improved design flexibility. [Structure] Spacers 31, 32 made of rigid bodies and a seal ring 33 made of an elastic body adhered to these spacers
And constitute the sealing mechanism 30. The sealing mechanism is sandwiched between the axial end surface 21 of the cylindrical portion 2 of the cylinder block 1 and the end surface 22 of the front housing 3 facing the axial end surface 21 so that the spacer and the seal ring are parallel to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a variable capacity swash plate compressor, and more particularly to a structure of a portion where a cylindrical portion of a cylinder block and a front housing are joined.

[0002]

[Prior Art]

 Conventionally, a variable capacity type swash plate compressor shown in FIG. 2 is known. In this compressor, the front housing 3 is fixed to the axial end of the tubular portion 2 of the cylinder block 1, and the crank chamber 4 is formed inside the tubular portion 2. A shaft 5 is rotatably supported in the front housing 3 in a penetrating state. Rotation of the rotor 6 can be applied to and disengaged from the shaft 5 via an electromagnetic clutch 7.

In the crank chamber 4, a swash plate 8 is attached to the shaft 5 so that the angle can be changed. A swing plate 9 faces the swash plate 8 in the axial direction via a bearing 11. The rotation of the oscillating plate 9 is blocked by the rotation blocking mechanism 12.

A piston 14 is connected to the periphery of the swing plate 9 via a piston rod 13. The piston 14 is slidably inserted in a cylinder 15 formed in the cylinder block 1.

When the shaft 5 is rotated, the rocking plate 9 rocks, causing the piston 14 to reciprocate in the cylinder 15. As a result, the fluid is sucked from the suction chamber 16 into the cylinder 15 and discharged into the discharge chamber 17.

This compressor is suitable for use in an air conditioner for automobiles. In that case, it goes without saying that a refrigerant is used as the fluid.

The angle of the swash plate 8 is automatically and appropriately changed according to the internal pressure of the crank chamber 4, the suction pressure, the discharge pressure, and the like. When the angle of the swash plate 8 changes, the compression capacity also changes. Therefore, it is important to reliably shut off the crank chamber 4 from the outside.

Conventionally, in order to seal between the axial end surface of the tubular portion 2 and the front housing 3, as shown in FIG. 3, an O-ring groove 18 extending in a ring shape on the axial end surface of the tubular portion 2 is provided. And an O-ring 19 made of an elastic material such as rubber is arranged in the O-ring groove 18.

[0009]

[Problems to be solved by the device]

 However, since the cylindrical portion 2 is not generally cylindrical due to problems in the internal mechanism, the O-ring groove 17 must be machined by an inefficient method such as end mill machining with a machining center, which impedes productivity. It is a factor.

Therefore, an object of the present invention is to provide a variable capacity swash plate compressor having excellent productivity, cost reduction, and improved design flexibility.

[0011]

[Means for Solving the Problems]

 According to the present invention, the front housing is fixed to the axial end of the tubular portion of the cylinder block to form the crank chamber inside the tubular portion, and the compression capacity is determined by referring to the internal pressure of the crank chamber. In the variable capacity swash plate compressor configured as described above, a spacer made of a rigid body and a seal ring made of an elastic body adhered to the spacer are provided between the axial end surface of the cylindrical portion and the front housing. A variable displacement type swash plate compressor characterized by being sandwiched in parallel with each other is obtained.

[0012]

【Example】

 FIG. 1 shows the essential parts of a swash plate compressor with variable capacity according to an embodiment of the present invention. In this variable displacement type swash plate compressor, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals and the description thereof will be omitted.

The axial end surface 21 of the cylindrical portion 2 of the cylinder block 1 is made substantially flat without forming a recess. On the other hand, the end surface 22 of the front housing 3 that faces the axial end surface 21 of the tubular portion 2 is also formed substantially flat. A sealing mechanism 30 having a ring shape as a whole is provided between the end faces 21 and 22. In addition, it is needless to say that the ring shape includes not only a circular shape but also a non-circular shape.

The sealing mechanism 30 includes a first spacer 31 having a relatively small diameter, a second spacer 32 having a relatively large diameter, and a rubber seal ring 33. The first and second spacers 31 and 32 are made of iron and are arranged concentrically with each other. The seal ring 33 is arranged between the first and second spacers 31 and 32 and is fixed to both by vulcanization.

The seal ring 33 has a ring-shaped seal portion 34 and ring-shaped connection portions 35 and 36 connecting the seal portion 34 to the first and second spacers 31 and 32. The seal portion 34 has an axial dimension that is slightly larger than the spacers 31 and 32 when no external force is applied. As a result, the seal portion 34 is pushed by the end faces 21 and 22 and slightly compressed, thereby ensuring the seal.

Further, as can be easily understood from FIG. 1, the axial dimension of the connecting portions 35 and 36 is significantly smaller than that of the spacers 31 and 32. As a result, four vacant spaces 37 are formed between the spacer 31 and the seal portion 34.

The first and second spacers 31 and 32 are not limited to iron, and may be made of another kind of rigid body, for example, copper or aluminum. The seal ring 33 is not limited to rubber and may be made of another type of elastic body, for example, resin.

[0018]

[Effect of the device]

 As described above, according to the variable capacity swash plate compressor of the present invention, the O-ring groove need not be machined, so that the productivity is excellent and the cost can be reduced. In addition, even in the case of non-circular and complicated-shaped seals, sealing can be easily performed, which improves the degree of freedom in design.

[Brief description of drawings]

FIG. 1 is a sectional view showing only a main part of a variable displacement swash plate compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an entire conventional variable displacement swash plate compressor.

FIG. 3 is a sectional view showing only a main part of the variable displacement swash plate compressor of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylindrical part 3 Front housing 4 Crank chamber 21 End surface 22 End surface 30 Sealing mechanism 31 First spacer 32 Second spacer 33 Seal ring

Claims (1)

[Scope of utility model registration request] 1. A front housing is fixed to an axial end of a tubular portion of a cylinder block to form a crank chamber inside the tubular portion, and a compression capacity is determined by referring to an internal pressure of the crank chamber. In the variable capacity type swash plate compressor, the spacer made of a rigid body and the seal ring made of an elastic body adhered to the spacer are arranged in parallel between the axial end surface of the cylindrical portion and the front housing. Variable capacity swash plate compressor characterized by being sandwiched.