JP2001132629A - Swash plate compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swash plate compressor capable of reducing leakage of refrigerant gas by improving bearing pressure generated on a gasket. SOLUTION: A recessed part 1c is formed all over a cylinder head side end surface of a cylinder block 1 except for an outer peripheral edge part 1b, depth dimensions t' of a peripheral region of a center bolt hole 1a as well as a peripheral region o a cylinder bore 6 of the recessed part 1c are made smaller than thickness dimensions t of a suction valve 21 and depth dimensions t" of a region except for the peripheral region of the cylinder bore 6 of the recessed part 1c and the peripheral region of the center bolt hole 1a are made larger than the thickness dimensions t of the suction valve 21, in a refrigerant compressor furnished with the cylinder block 1, a rear head fixed on the cylinder block 1, a valve plate 2 interposed between the cylinder block 1 and the rear head, the suction valve 21 provided between the valve plate 2 and the cylinder block 1 and to open and close a suction port 15, a gasket 23 provided between the suction valve 21 and the cylinder block 1 and a through bolt to integrally connect the cylinder block 1 and the rear head to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor, and more particularly to a swash plate type compressor suitable as a vehicle refrigerant compressor using CO2 as a refrigerant.

[0002]

2. Description of the Related Art FIG. 7 is a view of a cylinder block of a swash plate type compressor according to a first conventional example as viewed from the rear side.

[0003] Seven cylinder bores 106 are formed in the cylinder block 101. Notch 1 as a stopper of suction valve 121 (see FIG. 8) is provided in cylinder bore 106.
06a is formed.

A cylinder block 101 and a rear head 10 are mounted on an outer peripheral edge 101b of the cylinder block 101.
There are formed seven through-holes 131a for inserting through-bolts (not shown) that integrally connect the through-holes 3 with each other.

Further, at the center of the cylinder block 101, a discharge valve (not shown) and a center bolt (not shown) for fixing a valve plate 102 together with a valve retainer (not shown) to an end face on the rear head side are screwed. Center bolt hole 1
01a is formed.

FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 7 (however, the disassembled state is shown).

A concave portion 101c having a depth t equal to the thickness t of the suction valve 121 is formed on the rear end surface of the cylinder block 101 in which the plurality of cylinder bores 106 are formed.

The valve plate 102 is provided with a suction port 115 for communicating the compression chamber 122 with a suction chamber (not shown).

A suction valve 1 for opening and closing a suction port 115 is provided between a valve plate 102 and a cylinder block 101.
21 are provided.

[0010] A gasket 123 is provided between the suction valve 121 and the cylinder block 101 to seal between the cylinder bores 106.

The gasket 123 has an embossed bead 123a facing the periphery of the opening of the cylinder bore 106 in order to enhance the sealing performance.

Gasket 123 and valve plate 10
2, holes 123c and 2a facing the through bolt holes 131a of the cylinder lock 101 are formed.

FIG. 9 is a view of a cylinder block of a swash plate type compressor according to a second conventional example viewed from the rear side, and FIG. 10 is a view of FIG.
FIG. 10 is a cross-sectional view taken along the line X-X (however, shows a disassembled state). Parts common to FIGS. 8 and 9 and the first conventional example are denoted by the same reference numerals, and description thereof is omitted.

This conventional example differs from the first conventional example in that an iron liner 160 is inserted into a cylinder block 101 to form a cylinder bore 166.

The liner 160 is cylindrical, and its end face 1
A cutout 166a is formed in 60a.

[0016]

By the way, the refrigerant is CO
2, the sealing pressure is higher than when the refrigerant is Freon, and the through bolt 131 is
01, the surface pressure hardly occurs in the gasket 123 in the peripheral region of the cylinder bore 166 in the center of the cylinder block 101, the emboss bead 123 is insufficiently crushed, and the leakage of refrigerant gas occurs. Easy to do.

In the case of the second conventional example, the emboss bead 123a may straddle the cylinder block 101 and the end face 160a of the liner 160, and a leak of refrigerant gas may occur. In contrast, the end face 1 of the liner 160
By providing the embossed beads 123a outside the 60a, it is possible to avoid the leakage of the refrigerant gas, but in this method, the volume efficiency is reduced due to the increase of the dead volume.

In the case where the discharge chamber is provided at the center of the rear head, refrigerant gas easily leaks from the center bolt in any of the above-mentioned conventional examples.

The present invention has been made in view of such circumstances, and an object thereof is to provide a swash plate compressor capable of increasing the surface pressure generated in a gasket and reducing refrigerant gas leakage. is there.

[0020]

According to a first aspect of the present invention, there is provided a cylinder block having a plurality of cylinder bores, and a high-pressure chamber and a low-pressure chamber fixed to the cylinder block. A cylinder head, a valve plate interposed between the cylinder block and the cylinder head for partitioning the compression chamber in the cylinder bore from the high-pressure chamber and the low-pressure chamber, and formed in the valve plate; A suction port that communicates with the low-pressure chamber, a suction valve that is provided between the valve plate and the cylinder block, that opens and closes the suction port, and that is provided between the suction valve and the cylinder block. A gasket for sealing between the cylinder bores, and the cylinder block and the cylinder via the valve plate. A plurality of through bolts integrally connecting the head and a through-bolt, wherein a recess is formed entirely except for an outer peripheral edge of a cylinder head side end surface of the cylinder block; and a depth of the recess around the cylinder bore. The size is smaller than the thickness of the suction valve, and the depth of the recess other than the area around the cylinder bore is larger than the thickness of the suction valve.

When the cylinder block and the cylinder head are integrally connected, the gasket is sufficiently pressed against the region around the cylinder bore, so that the surface pressure generated on the gasket around the region around the cylinder bore can be sufficiently increased.

According to a second aspect of the present invention, there is provided a cylinder block having a plurality of cylinder bores, a liner inserted into the cylinder bore, a cylinder head fixed to the cylinder block and having a high pressure chamber and a low pressure chamber. A valve plate interposed between the cylinder block and the cylinder head for partitioning the compression chamber in the cylinder bore from the high-pressure chamber and the low-pressure chamber; and a valve plate formed in the valve plate, wherein the compression chamber and the low-pressure chamber are formed. And a suction valve provided between the valve plate and the cylinder block to open and close the suction port; and a suction valve provided between the suction valve and the cylinder block, and provided between the cylinder bores. A gasket for sealing, and the cylinder block and the cylinder via the valve plate. And a plurality of through bolts that integrally connect the cylinder block and the cylinder block, a recess is formed entirely except for the outer peripheral edge of the cylinder head side end surface of the cylinder block, and the liner extends from the cylinder head side end surface of the liner. The dimension of the cylinder block up to the end face on the cylinder head side is smaller than the thickness of the suction valve, and the depth of the recess other than the liner is larger than the thickness of the suction valve.

When the cylinder block and the cylinder head are integrally connected, the gasket is sufficiently pressed against the cylinder head side end face of the liner to sufficiently increase the surface pressure generated on the gasket at the cylinder head side end face of the liner. it can.

According to a third aspect of the present invention, in the swash plate type compressor according to the second aspect, an annular bead portion of the gasket is pressed against an end face of the liner.

The annular bead portion of the gasket is sufficiently crushed by the end face of the liner to increase the surface pressure generated on the gasket.

According to a fourth aspect of the present invention, there is provided a cylinder block in which a plurality of cylinder bores are formed, a center bolt hole formed in a central portion of the cylinder block, a high-pressure chamber and a low-pressure chamber fixed to the cylinder block. A cylinder head having a valve plate interposed between the cylinder block and the cylinder head to partition a compression chamber in the cylinder bore from the high-pressure chamber and the low-pressure chamber; and A suction port for communicating the compression chamber with the low-pressure chamber, a suction valve provided between the valve plate and the cylinder block for opening and closing the suction port, and a suction valve provided between the suction valve and the cylinder block; A gasket for sealing between the cylinder bores and the cylinder block via the valve plate. In a refrigerant compressor including a lock and a plurality of through bolts integrally connecting the cylinder head, a recess is formed entirely except for an outer peripheral portion of a cylinder head side end surface of the cylinder block, and a center bolt of the recess is formed. The depth dimension of the hole peripheral area is smaller than the thickness dimension of the suction valve, and the depth dimension of the recess other than the center bolt hole peripheral area is greater than the thickness dimension of the suction valve.

When the cylinder block and the cylinder head are integrally connected, the gasket is sufficiently pressed against the area around the center bolt hole, so that the surface pressure generated on the gasket in the area around the center bolt hole can be sufficiently increased.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the entire swash plate type compressor according to the first embodiment of the present invention.

This swash plate type compressor uses CO2 (carbon dioxide).
Is used as one component of a refrigeration system using as a refrigerant.
A rear head (cylinder head) is provided on one end surface of a cylinder block 1 of the swash plate type compressor via a valve plate 2.
3 and a front head 4 on the other end surface.

The front head 4, the cylinder block 1,
The valve plate 2 and the rear head 3 are integrally connected by a through bolt 31 in the direction of the center axis of the shaft 5.

The valve plate 2 partitions the compression chamber 22 in the cylinder bore 6 from the discharge chamber 12 and the suction chamber 13. The valve plate 2 has a discharge port 16 for communicating the compression chamber 22 with the discharge chamber 12 and a suction port 15 for communicating the compression chamber 22 with the suction chamber 13 at predetermined intervals along the circumferential direction. Is provided.

The discharge port 16 is opened and closed by a discharge valve 17, and the discharge valve 17 is fixed to an end face on the rear head side of the valve plate 2 by a center bolt 19 together with a valve retainer 18.

The front head 4 has a crank chamber 8 for accommodating a swash plate 10 and a thrust flange 40, which will be described later.

The rear head 3 has a suction chamber (low pressure chamber) 13 and a discharge chamber (high pressure chamber) 12. Inhalation chamber 13
Are located around the discharge chamber 12. The suction chamber 13 contains a low-pressure refrigerant gas sent into the compression chamber 22.
The discharge chamber 12 contains the high-pressure refrigerant gas discharged from the compression chamber 22. The discharge chamber 12 communicates with the discharge port 3a via the communication passage 60.

One end of the shaft 5 is rotatably supported by the front head 4 via a radial bearing 26, and the other end of the shaft 5 is connected to a radial bearing 25 and a thrust bearing 24.
And is rotatably supported by the cylinder block 1 via the.

The thrust flange 40 is fixed to the shaft 5 and rotates integrally with the shaft 5. A swash plate 10 is attached to the shaft 5 so as to be inclined and slidable.

The swash plate 10 is connected to a thrust flange 40 via a link mechanism 41, and rotates together with the rotation of the thrust flange 40. A shoe 50 that supports the spherical one end 11a of the connecting rod 11 so as to be relatively rotatable is held by a retainer 53 on the sliding surface 10a of the swash plate 10.

A radial bearing 55 is mounted on the boss 10b of the swash plate 10, and the retainer 53 is rotatable relative to the swash plate 10. The radial bearing 55 is prevented from coming off by a stopper 54 fixed to the boss 10b. The other end 11 b of the connecting rod 11 is fixed to the piston 7.

The shoe 50 is connected to the connecting rod 11
And a ring-shaped washer 52 that supports the rear end face of the connecting rod 11 so that the rear end face of the connecting rod 11 can be relatively rolled. I have.

A thrust flange 40 fixed to the front end of the shaft 5 is rotatably supported on the inner wall surface of the front head 4 via a thrust bearing 33. As described above, the thrust flange 40 and the swash plate 10 are connected via the link mechanism 41, and the swash plate 10 can be inclined with respect to an imaginary plane perpendicular to the shaft 5.

The link mechanism 41 includes a pair of protrusions 10d provided on the front end face 10c of the swash plate 10, an arm 40a provided on the swash plate-side end face 40c of the thrust flange 40, and a link between the two protrusions 10d. Arm 40
and a connecting pin 43 engaged with the long hole 40b.

A winding spring 47 is mounted between the thrust flange 40 and the swash plate 10, and the swash plate 10 is urged rearward by the urging force of the winding spring 47. A disc spring 48 is mounted between the winding springs 4.
The biasing force 8 biases the swash plate 10 toward the front.

FIG. 2 is a view of the cylinder block as viewed from the rear side.

In FIG. 2, the portion indicated by the dashed line indicates the position where the bead portions 23a, 23b and 23c of the gasket 23 abut.

In the cylinder block 1, seven cylinder bores 6 are formed at predetermined intervals along a circumference centered on the shaft 5. A piston 7 is slidably inserted into each cylinder bore 6. The cylinder bore 6 is formed with a notch 6 a as a stopper for the suction valve 21.

In the center of the cylinder block 1, there is formed a center bolt hole 1a screwed with the center bolt 19.

The outer peripheral edge 1b of the cylinder block 1 is formed with seven holes 31a through which the through bolts 31 are inserted.

A recess 1c is formed on the entire surface of the cylinder block 1 except for the outer peripheral edge 1b of the end face on the cylinder head side.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2 (although the disassembled state is shown).

A suction valve 21 for opening and closing the suction port 15 is provided on the front end face of the valve plate 2.

A gasket 23 for sealing between the cylinder bores 6 is provided between the suction valve 21 and the cylinder block 1.
Is provided.

The gasket 23 is provided with beads 23a, 23b and 2 opposed to the peripheral area of the opening of the cylinder bore 6 and the peripheral area of the center bolt hole 1a in order to enhance the sealing performance.
3c is formed.

Recess 1c formed in cylinder block 1
(The dimension from the cylinder head side end surface of the cylinder block 1 to the bottom surface 1d of the concave portion 1c) differs depending on the region as follows.

The depth t 'of the peripheral region of the cylinder bore 6 and the peripheral region of the center bolt hole 1a is smaller than the thickness t of the suction valve 21, and the depth dimension of the region other than the cylinder bore peripheral region and the center bolt hole peripheral region. t ″ is larger than the thickness dimension t of the suction valve.

The gasket 23 and the valve plate 2 have holes 2 facing the through bolt holes 31a of the cylinder lock 1.
3d and 2a are formed.

Next, the operation of the variable displacement type swash plate type compressor will be described.

When the rotational power of the vehicle-mounted engine (not shown) is transmitted to the shaft 5, the rotational force of the shaft 5 is transmitted to the swash plate 10 via the thrust flange 40 and the link mechanism 41, and the swash plate 10 rotates.

The rotation of the swash plate 10 causes the shoe 50 to move to the swash plate 1.
0 on the sliding surface 10a, and the rotational force from the swash plate 10 is converted into a linear reciprocating motion of the piston 7. When the piston 7 reciprocates in the cylinder bore 6, the volume of the compression chamber 22 in the cylinder bore 6 changes, and the suction, compression, and discharge of the refrigerant gas are sequentially performed by this volume change, and the refrigerant gas is changed according to the inclination angle of the swash plate 10. A volume of high-pressure refrigerant gas is discharged. At the time of suction, the suction valve 21 opens, and low-pressure refrigerant is sucked from the suction chamber 13 into the compression chamber 22 in the cylinder bore 6, and at the time of discharge, the discharge valve 17 opens, and high-pressure refrigerant gas flows from the compression chamber 22 to the discharge chamber 12. Discharged.

When the heat load decreases and the pressure in the crank chamber 8 increases, the inclination angle of the swash plate 10 decreases, so that the stroke amount of the piston 7 decreases and the discharge capacity decreases. On the other hand, when the heat load increases and the pressure in the crank chamber 8 decreases, the inclination angle of the swash plate 10 increases, so that the stroke amount of the piston 7 increases and the discharge capacity increases.

According to this embodiment, the following effects can be obtained.

Since the surface pressure of the gasket 23 in the peripheral region of the cylinder bore 6 and the peripheral region of the center bolt hole 1a increases, the bead portion 23a can be sufficiently crushed, and the refrigerant gas between the cylinder bores 6 and from the center bolt 19 can be removed. Leakage can be reliably prevented. As a result, the volumetric efficiency and the refrigerating capacity are improved, and the leakage of the high-pressure and high-temperature refrigerant gas to the low-pressure side can be reduced, the discharge temperature does not rise above the set value, and the durability of the rubber material (for example, nitrile rubber) is improved The performance is improved.

Since the depth dimension t ″ other than the peripheral area of the cylinder bore 6 and the peripheral area of the center bolt hole 1a is larger than the thickness dimension t of the suction valve, a load is applied to an area unnecessary for preventing leakage of the refrigerant gas. , And high-precision processing is not required, so that manufacturing costs can be reduced.

FIG. 4 is a longitudinal sectional view showing the entire swash plate type compressor according to a second embodiment of the present invention, and FIG. 5 is a view of the cylinder block as viewed from the rear side. Are denoted by the same reference numerals and description thereof is omitted.

This embodiment differs from the first embodiment in that a liner 60 is inserted into the cylinder 1 to form a cylinder bore 66.

In FIG. 5, the portions indicated by the one-dot chain line and the two-dot chain line are bead portions 23a, 23b,
Reference numeral 23c indicates a position where the liner abuts on the end face 60a of the liner 60.

In the cylinder block 1, seven cylinder bores 66 are formed by a liner 60 at predetermined intervals along a circumference around the shaft 5. The piston 7 is slidably inserted into each cylinder bore 66. A cutout 66 a as a stopper for the suction valve 21 is formed in the end face 60 a of the liner 60.

A recess 1c is formed on the entire surface of the cylinder block 1 except for the outer peripheral edge 1b on the end face on the cylinder head side.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5 (however, the disassembled state is shown).

Recess 1c formed in cylinder block 1
(The dimension from the cylinder head side end surface of the cylinder block 1 to the bottom surface of the concave portion 1d) differs depending on the region as follows.

The depth t 'of the area of the end face 60a of the liner 60 and the area around the center bolt hole 1a is smaller than the thickness t of the suction valve 21, and the area other than the area of the end face 60a of the liner 60 and the area around the center bolt hole 1a. Is larger than the thickness t of the suction valve 21.

The outer diameter D2 of the end face 60a of the liner 60 is a dimension that can include the bead portion 23a. Liner 60
When the diameter of the cylindrical portion 60b is D1, the diameter D1 is D1.
<D2.

According to this embodiment, the same effects as those of the first embodiment can be obtained. Liner 6
Since the depth dimension other than the zero end face 60a area is larger than the thickness dimension of the suction valve, an unnecessary area (the liner 60
(A region other than the end surface 60a region) and no high-precision processing is required, so that manufacturing costs can be reduced. Further, the end face 60a of the liner 60
Accordingly, positioning when the liner 60 is inserted into the cylinder block 1 can be performed.

In the above embodiment, the crank chamber 8
As an example, a variable displacement type swash plate type compressor (so-called single swash plate type compressor) in which the inclination of the swash plate 10 changes according to the pressure change of the swash plate 10 is taken out. The present invention can also be applied to a fixed displacement type swash plate type compressor that does not have a fixed capacity.

[0075]

As described above, according to the swash plate type compressor according to the first to third aspects of the present invention, the leak between the adjacent cylinder bores is reduced, the volume efficiency and the refrigerating capacity are improved, and the compressor is compressed. The leakage of the high-temperature gas to the low-pressure side can be reduced, the discharge temperature does not rise above the set value, and the durability of the rubber material is improved.

According to the swash plate type compressor according to the fourth aspect of the present invention, the high temperature gas compressed from the bolt for fixing the discharge valve and fixing the discharge valve to the rear head side end face of the valve plate is prevented from leaking to the low pressure side. As a result, the discharge temperature does not rise above the set value, and the durability of the rubber material is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire swash plate type compressor according to a first embodiment of the present invention.

FIG. 2 is a view of a cylinder block as viewed from a rear side.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view showing the entire swash plate type compressor according to a second embodiment of the present invention.

FIG. 5 is a view of the cylinder block as viewed from the rear side.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a view of a cylinder block of a swash plate type compressor according to a first conventional example as viewed from the rear side.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7;

FIG. 9 is a view of a cylinder block of a swash plate type compressor according to a second conventional example as viewed from the rear side.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 1a Center bolt hole 1c recess 2 Valve plate 3 Rear head (cylinder head) 6 Cylinder bore 12 Discharge chamber (high pressure chamber) 13 Suction chamber (low pressure chamber) 15 Suction port 21 Suction valve 23 Gasket 23a, 23b, 23c Bead part 31 Through bolt 60 Liner 60a End face

Claims (4)

[Claims] A cylinder block having a plurality of cylinder bores formed therein; a cylinder head fixed to the cylinder block and having a high-pressure chamber and a low-pressure chamber; interposed between the cylinder block and the cylinder head; A valve plate for separating the compression chamber in the cylinder bore from the high-pressure chamber and the low-pressure chamber; a suction port formed in the valve plate for communicating the compression chamber with the low-pressure chamber; the valve plate and the cylinder block And a suction valve that opens and closes the suction port, and is provided between the suction valve and the cylinder block,
A gasket for sealing between the cylinder bores; and a plurality of through bolts for integrally connecting the cylinder block and the cylinder head through the valve plate, wherein the cylinder block has a cylinder head side. A concave portion is formed on the entire surface except the outer peripheral edge of the end face, a depth dimension of the concave portion around the cylinder bore is smaller than a thickness dimension of the suction valve, and a depth dimension of the concave portion other than the cylinder bore peripheral region is the same. A swash plate compressor characterized by being larger than the thickness of the suction valve. 2. A cylinder block having a plurality of cylinder bores, a liner inserted into the cylinder bore, a cylinder head fixed to the cylinder block and having a high-pressure chamber and a low-pressure chamber, the cylinder block and the cylinder A valve plate interposed between the head and a partition for separating the compression chamber in the cylinder bore from the high pressure chamber and the low pressure chamber; and a suction port formed in the valve plate for communicating the compression chamber with the low pressure chamber. And a suction valve provided between the valve plate and the cylinder block to open and close the suction port; provided between the suction valve and the cylinder block;
A gasket for sealing between the cylinder bores; and a plurality of through bolts for integrally connecting the cylinder block and the cylinder head through the valve plate, wherein the cylinder block has a cylinder head side. A concave portion is formed on the entire end surface of the end surface except for an outer peripheral portion, a dimension from a cylinder head side end surface of the liner to a cylinder head side end surface of the cylinder block is smaller than a thickness dimension of the suction valve, and the concave portion other than the liner A swash plate type compressor, wherein the depth dimension of the region is larger than the thickness dimension of the suction valve. 3. The swash plate compressor according to claim 2, wherein an annular bead portion of the gasket is pressed against an end surface of the liner. A cylinder block having a plurality of cylinder bores formed therein, a center bolt hole formed in a central portion of the cylinder block, a cylinder head fixed to the cylinder block and having a high-pressure chamber and a low-pressure chamber; A valve plate interposed between the cylinder block and the cylinder head to partition a compression chamber in the cylinder bore from the high-pressure chamber and the low-pressure chamber; and a valve plate formed in the valve plate, the compression chamber and the low-pressure chamber. And a suction port provided between the valve plate and the cylinder block to open and close the suction port; and a suction valve provided between the suction valve and the cylinder block,
A gasket for sealing between the cylinder bores; and a plurality of through bolts for integrally connecting the cylinder block and the cylinder head through the valve plate, wherein the cylinder block has a cylinder head side. A concave portion is formed entirely except for an outer peripheral edge portion of the end face, a depth dimension of a center bolt hole peripheral region of the concave portion is smaller than a thickness dimension of the suction valve, and a concave portion of the concave portion other than the center bolt hole peripheral region. A swash plate type compressor, wherein a depth dimension is larger than a thickness dimension of the suction valve.