JPH11201063A - Vane type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leak of cooling medium gas from a discharge valve containing chamber, reduce the number of parts, and set manufacturing cost low. SOLUTION: In a partition wall 1b to part a compression chamber 12a and a discharge valve containing chamber 20 from each other, a bolt insertion hole 23 for a bolt 22 to be inserted is provided, and a recess 24 to contain a head part 22a of the bolt 22 is provided in an inner circumferential surface 1a of a cam ring 1. The bolt 22 can thus be threaded from the inner side of the cam ring 1 to fix a discharge valve 19 and a discharge valve presser 21 in the discharge valve containing chamber 20. As a result, the discharge valve containing chamber 20 can be composed of a so-called spot-faced hole provided in one end surface of the cam ring 1 only, thereby need of a discharge valve cover or an O-ring is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type compressor, and more particularly to a vane type compressor capable of preventing leakage of high-pressure refrigerant gas.

[0002]

2. Description of the Related Art FIG. 3 is an exploded perspective view showing a structure around a discharge valve of a conventional vane type compressor, and FIG. 4 is a sectional view showing a structure around a discharge valve.

As shown in FIG. 3, the vane compressor includes a cam ring 101, a front side block 104 disposed on the front side of the cam ring 101, and a front head 106 disposed on the front side of the front side block 104. , A rear side block 103 disposed on the rear side of the cam ring 101, and a rear side block 1
03, a rear head 105 disposed on the rear side, a rotor 102 rotatably housed in a cam ring 101,
And a drive shaft 107 for the rotor 102.

The outer peripheral wall of the cam ring 101 is provided with two discharge ports 116 corresponding to two compression spaces (only one discharge port 116 is visible in FIGS. 3 and 4). The compression space 112 is divided into a plurality of compression chambers 112a by a plurality of vanes 114,
a communicates with the discharge valve housing chamber 120 via the discharge port 116 in the discharge stroke.

A concave 124 is formed on the outer peripheral wall of the cam ring 101.
A U-shaped discharge valve 119 for opening and closing the discharge port 116 and a discharge valve retainer 121 for limiting the opening amount of the discharge valve 119 are accommodated in the recess 124. Discharge valve 11
9 and the discharge valve retainer 121 are overlapped with each other, and their ends are bolted to the inclined surface 124 a of the concave portion 124.
It is fixed at.

An O-ring 1 is provided on the outer peripheral wall of the cam ring 101.
The discharge valve cover 117 is fixed with bolts 118 via the cover 30, and the discharge valve cover 117 covers the discharge valve 119 and the discharge valve retainer 121. Discharge valve chamber 1
Reference numeral 20 is formed by the inner wall surface of the discharge valve cover 117 and the recess 124. The discharge valve housing chamber 120 is adjacent to the compression chamber 112a via the partition wall 101b.

The volume of each compression chamber 112a changes with the rotation of the rotor 102. When the refrigerant gas in the compression chamber 112a is compressed and the internal pressure exceeds a certain value, the discharge valve 119 opens and the refrigerant gas is discharged through the discharge port 116. The liquid is discharged into the valve storage chamber 120 and is sent from the discharge valve storage chamber 120 to a discharge chamber (not shown).

[0008]

However, as described above, the discharge valve cover 117 has an O.O.
Although fixed via the ring 130, the high-pressure refrigerant gas discharged from the compression chamber 112a is fed into the discharge valve housing chamber 120, so that the internal pressure of the discharge valve housing chamber 120 is high, and the refrigerant gas is discharged to the outside. If a leak or so-called liquid compression occurs, the bolt 118 or the discharge valve cover 117 may come off.

Further, in the conventional vane type compressor, since the discharge valve cover 117, the cover fixing bolt 118, the O-ring 130 and the like are used, there is a problem that the number of parts increases and the manufacturing cost increases. .

The present invention has been made in view of such circumstances, and has as its object to prevent leakage of refrigerant gas and detachment of bolts, as well as to reduce the number of parts and to reduce the manufacturing cost. It is to provide.

[0011]

According to a first aspect of the present invention, there is provided a vane-type compressor including a compression chamber formed in a cam ring in which a rotor is rotatably accommodated, and a partition wall. A discharge valve housing chamber adjacent to the compression chamber, a discharge port formed in the partition wall for sending gas from the compression chamber to the discharge valve housing chamber, and a discharge port housed in the discharge valve housing chamber; In a vane compressor including a discharge valve that opens and closes the discharge port according to the pressure of the discharge valve, and a fixing member that fixes one end of the discharge valve, a through hole for inserting the fixing member is formed in the partition wall. The fixing member is inserted into the through hole, a tip end of the fixing member is coupled to one end of the discharge valve, and a head of the fixing member is provided in a concave portion provided on an inner peripheral surface of the cam ring. That they are contained And butterflies.

As described above, the through-hole for passing the fixing member is provided in the partition wall, and the recess for accommodating the head of the fixing member is provided on the inner peripheral surface of the cam ring, so that the fixing member is inserted from the inside of the cam ring. Since the discharge valve in the discharge valve housing chamber can be fixed, the discharge valve housing chamber can be constituted only by the so-called counterbore holes provided on the end surface of the cam ring. It becomes unnecessary.

[0013] The vane type compressor according to the second aspect of the present invention,
2. The vane type compressor according to claim 1, wherein the recess is located on a front side of the discharge port in a rotor rotation direction and is in a position communicating with the compression chamber after the end of a discharge stroke and before the end of a suction stroke. Features.

As described above, the recess is located on the front side of the discharge port in the rotor rotation direction and communicates with the compression chamber after the end of the discharge stroke and before the end of the suction stroke, so that the refrigerant gas in the compression chamber in the compression stroke is discharged through the through hole. It does not leak into the valve accommodating chamber, the performance does not decrease, and the volume of the recess does not become dead volume.

[0015]

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

FIG. 1 is a sectional view showing a structure around a discharge valve of a vane compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a cam ring.

This vane type compressor has a cam ring 1,
A front side block and a front head (not shown) disposed on the front side of the cam ring 1, a rear side block and a rear head not shown disposed on the rear side of the cam ring 1, and a rotor 2 rotatably housed in the cam ring 1; And a drive shaft 7 for the rotor 2.

Two compression spaces 12 are formed between the inner peripheral surface 1a of the cam ring 1 and the outer peripheral surface 2a of the rotor 2. A plurality of vane grooves 13 are provided in the rotor 2, and a vane 14 is slidably inserted into these vane grooves 13. The compression space 12 is partitioned by vanes 14 to form a plurality of compression chambers 12a, and the volume of each compression chamber 12a changes with the rotation of the rotor 2.

Two discharge valve housing chambers 20 are formed on one end surface of the cam ring 1 (only one discharge valve housing chamber 20 is visible in FIGS. 1 and 2). Discharge valve chamber 2
Numeral 0 is adjacent to the compression chamber 12a via the partition 1b. The partition wall 1b is provided with a discharge port 16 for sending out the gas in the compression chamber 12a to the discharge valve housing chamber 20. The discharge valve housing chamber 20 houses a discharge valve 19 that opens and closes the discharge port 16 according to the pressure of the refrigerant gas in the compression chamber 12a, and a discharge valve retainer 21 that limits the opening amount of the discharge valve 19. The discharge valve 19 and the discharge valve retainer 21 are overlapped with each other, and their ends are fixed by bolts (fixing members) 22. At the time of assembly, the bolt 22 is inserted from the inside of the cam ring 1 into a bolt through hole 23 (through hole) provided in the partition wall 1b, and screwed into a screw hole 21a provided in the discharge valve retainer 21. As shown in FIG. 2, the center line of the bolt through hole 23 is inclined at a predetermined angle with respect to an axis orthogonal to the center line of the cam ring 1, in order to increase the accuracy of the bolt through hole 23 in processing. .

Since the recess 24 is provided on the inner peripheral surface 1a of the cam ring 1 and on the center axis of the bolt hole 23, the head 22a of the bolt 22 is housed in the recess 24, The head 22a is the inner peripheral surface 1 of the cam ring 1.
a does not protrude into the compression chamber 12a. The bearing surface of the head 22 a of the bolt 22 is in close contact with the bottom of the recess 24.

The recess 24 is provided at the discharge port 1 as shown in FIG.
6, which is located on the front side in the rotor rotation direction A and communicates with the compression chamber 12a after the end of the discharge stroke and before the end of the suction stroke.

Next, the operation of the vane compressor will be described.

The rotational power of the engine (not shown) is
, The rotor 2 rotates. The refrigerant gas flowing out of the outlet of the evaporator (not shown) is sucked into the compression space 12. The interior of the compression space 12 is partitioned by vanes 14 to form a plurality of compression chambers 12a, and the volume of each compression chamber 12a changes with the rotation of the rotor 2.
4 is compressed, and when the internal pressure exceeds a certain value, the discharge valve 19 is opened and the discharge port 16 is opened.
The refrigerant gas is discharged to the discharge valve housing chamber 20 through the passage. The refrigerant gas in the discharge valve housing chamber 20 is sent to a discharge chamber (not shown), and is sent from a discharge port (not shown) to an inlet of a condenser (not shown).

When the discharge valve 19 is opened, the discharge valve 19 collides with the discharge valve retainer 21, and the opening amount of the discharge valve 19 is limited.

During the rotation of the rotor 2, the tip of the vane 14 slides on the inner peripheral surface 1 a of the cam ring 1.
2 is accommodated in the recess 24 and the bolt 2
Since the second head 22a does not protrude from the inner peripheral surface 1a of the cam ring 1 into the compression chamber 12a, the tip of the vane 14 does not hit the head 22a of the bolt 22.

According to the vane type compressor of this embodiment,
A bolt passage hole 23 for passing the bolt 22 is provided in the partition wall 1b, and a concave portion 24 for accommodating the head portion 22a of the bolt 22 is provided on the inner peripheral surface 1a of the cam ring 1. The discharge valve 19 and the discharge valve retainer 21 can be fixed in the discharge valve storage chamber 20. Therefore, the discharge valve accommodating chamber 20 can be constituted only by the so-called counterbore holes provided on the end surface of the cam ring 1, so that the discharge valve cover 117, the O-ring 130, and the like become unnecessary, and the discharge valve cover is used. It is possible to prevent leakage of the refrigerant gas from the discharge valve housing chamber,
The number of parts is reduced, and the manufacturing cost can be reduced.

The recess 24 is located in front of the discharge port 16 in the rotor rotation direction A, and communicates with the compression chamber 12a after the end of the discharge stroke and before the end of the suction stroke. It does not leak into the discharge valve housing chamber 20 through the through hole 23, the performance does not decrease, and the volume of the concave portion 24 does not become a dead volume.

Incidentally, the concave portion 24 is located on the rear side of the discharge port 16 in the rotor rotation direction, and the compression chamber 12a in the compression stroke.
If it is located at a position communicating with the refrigerant gas, the refrigerant gas may leak from the compression chamber 12a through the bolt passage hole 23.

In the above-described embodiment, the case where the bolt through hole 23 as a through hole is a mere through hole and the screw hole 21a is provided in the discharge valve retainer 21, but the bolt through hole 23 is formed as a screw hole. Is also good. Alternatively, the screw hole 21a of the discharge valve retainer 21 may be a through hole, and the discharge valve 19 and the discharge valve retainer 21 may be fixed using a nut.

In the above-described embodiment, the case where the bolt 22 is used as the fixing member has been described. However, a rivet (not shown) may be used instead of the bolt 22 as another fixing member.

[0031]

As described above, according to the vane type compressor of the first aspect of the present invention, the discharge valve in the discharge valve housing chamber can be fixed by inserting the fixing member from the inside of the cam ring. Therefore, the discharge valve housing chamber can be constituted only by a so-called counterbore provided on one end surface of the cam ring, and it is not necessary to use a discharge valve cover or an O-ring. Leakage of the refrigerant gas from the storage chamber can be prevented, the number of parts can be reduced, and the manufacturing cost can be suppressed.

According to the vane type compressor of the second aspect of the present invention, the recess is located in front of the discharge port in the rotor rotation direction and communicates with the compression chamber after the end of the discharge stroke and before the end of the suction stroke. The refrigerant gas in the compression chamber does not leak into the discharge valve chamber through the through hole, the performance does not decrease, and the volume of the recess does not become a dead volume.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure around a discharge valve of a vane compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a cam ring.

FIG. 3 is an exploded perspective view showing a structure around a discharge valve of a conventional vane compressor.

FIG. 4 is an exploded perspective view showing a structure around a discharge valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cam ring 1a Inner peripheral surface of cam ring 1b Partition wall of cam ring 2 Rotor 12a Compression chamber 16 Discharge port 19 Discharge valve 20 Discharge valve accommodating chamber 22 Bolt 22a Bolt head 23 Bolt through hole 24 Recess

Claims (2)

[Claims] 1. A compression chamber formed in a cam ring in which a rotor is rotatably accommodated, a discharge valve accommodation chamber adjacent to the compression chamber via a partition, and a gas in the compression chamber formed in the partition. A discharge port that feeds the discharge valve into the discharge valve storage chamber, a discharge valve that is stored in the discharge valve storage chamber, and that opens and closes the discharge port according to the pressure of the gas in the compression chamber, and fixes one end of the discharge valve. In the vane compressor provided with a fixing member, a through hole for inserting the fixing member is provided in the partition, and the fixing member is inserted into the through hole, and a tip end of the fixing member is the discharge valve. Wherein the head of the fixing member is accommodated in a recess provided on the inner peripheral surface of the cam ring. 2. The method according to claim 1, wherein the recess is located on the front side of the discharge port in the rotor rotation direction and is in a position communicating with the compression chamber after the end of the discharge stroke and before the end of the suction stroke. Vane type compressor.