JPH0619836Y2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a scroll compressor.

[Prior Art] In a scroll type compressor, as shown in FIG. 4, a movable scroll 42 is provided so as to be non-rotatable and revolvable so as to face the fixed scroll 41, and the base end walls 41a, 42a of both scrolls 41, 42 are provided. A closed space (compression chamber) P is formed by the spiral portions 41b and 42b, and the closed space P moves toward the center while its volume decreases as the movable scroll 42 revolves to compress the refrigerant gas. The generated refrigerant gas is discharged from the discharge port 43 into the discharge chamber 44. On the discharge chamber 44 side of the base end wall 41a of the fixed scroll 41, a discharge valve 45 that opens and closes the discharge port 43 and a retainer 46 that prevents the discharge valve 45 from largely bending when opened are fixed bolts 47. It is fixed by tightening.

Further, conventionally, in a swash plate compressor, a muffler chamber is generally provided in the passage of the discharge gas, and when the discharge gas passes through the muffler chamber, it is subjected to a throttling action and an expansion action to reduce the discharge pulsation. However, since the scroll compressor has a smaller discharge pulsation than the swash plate compressor, the muffler chamber was not provided.

[Problems to be Solved by the Invention] In the conventional device, since the discharge valve 45 and the retainer 46 are fixed to the back surface of the base end wall 41a of the fixed scroll 41 by the fixing bolt 47, it is necessary to form a bolt hole in the base end wall 41a. . Further, in the scroll type compressor as well, there is a desire to reduce the discharge pulsation without increasing the size of the compressor.

The present invention has been made in view of the above problems, and an object thereof is a scroll type in which a muffler chamber can be formed with a simple structure without increasing the size of a compressor, and moreover, a discharge valve and a retainer can be easily fixed. To provide a compressor.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a rear housing is joined and fixed to a rear portion of a fixed scroll by a bolt to form a chamber between the fixed scroll and the rear housing. The chamber is divided into a discharge chamber and a muffler chamber by a partition member that is sandwiched between the fixed scroll and the rear housing, and communicates with a throttle passage, and a retainer-shaped engaging portion of the discharge valve is formed in a part of the partition member. Then, a part of the engaging portion presses the discharge valve against the rear surface of the base end wall of the fixed scroll to fix the discharge valve.

[Operation] In the compressor of the present invention, the discharge chamber and the muffler chamber are defined by the partition member sandwiched between the fixed scroll and the rear housing. The engaging portion formed on the partition member serves as a retainer, and the discharge valve is fixed at a predetermined position in pressure contact with the base end wall of the fixed scroll by a part of the engaging portion formed on the partition member. Further, the refrigerant gas compressed in the closed space (compression chamber) by the operation of the compressor is discharged from the discharge port to the discharge chamber and then discharged from the throttle passage to the external cooling circuit via the muffler chamber. Therefore, the discharge pulsation that is subjected to the throttling action and the expansion action when the discharge gas passes through the muffler chamber is reduced.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the housing 1 is composed of front housings 2A and 2B, a center housing 3 and a rear housing 4 which are joined and fixed. Center housing 3
An annular fixed substrate 5 is fitted and fixed on the inner peripheral surface of the tip of the so as to contact the end surface of the front housing 2B. A rotary shaft 6 is rotatably housed in the front housings 2A and 2B, and a large-diameter portion 6a of the rotary shaft 6 is provided with an eccentric shaft 7 so as to project into the center housing 3. A balance weight 8 and a bush 9 are rotatably supported on the eccentric shaft 7, and a movable scroll 10 is rotatably supported on the bush 9. Fixed scroll 11 is spiral part 1
1b is housed in the center housing 3, and its base end wall 11a is fixed so as to face the movable scroll 10 while being sandwiched between the center housing 3 and the rear housing 4. A closed space (compression chamber) P is formed by the base end walls 10a and 11a of the scrolls 10 and 11 and the spiral portions 10b and 11b.

A fixed ring 12 is fixed to the fixed base plate 5 facing the movable scroll 10, and a plurality of circular revolution position restriction holes 12a are formed in the fixed ring 12 at equal intervals. On the back surface of the base end wall 10a of the orbiting scroll 10, a movable ring 13 having the same number of circular orbital position regulating holes 13a facing the orbiting position regulating holes 12a is fixed. Disc-shaped shoes 14a, 14b having a smaller diameter than that of the revolution position regulating holes 12a, 13a are accommodated, and a ball 15 is interposed between the opposing shoes 14a, 14b. The shoes 14a and 14b and the ball 15 are press-fitted between the fixed substrate 5 and the movable scroll 10 by a compression reaction, and are apparently integrated. Then, all the shoes 14a, 14a have the revolution position regulating holes 12a, 13a.
The eccentric shaft 7 revolves around the periphery of the revolution position regulating holes 12a, 13a in the same direction while being sandwiched between them, so that the movable scroll 10 revolves without rotating.

The suction chamber 16 is provided in the center housing 3, and the refrigerant gas introduced into the suction chamber 16 is introduced into the closed space P from the suction port 17 formed in the outer wall portion of the center housing 3 to cause the movable scroll 10 to move. It is compressed with the revolution.
An annular projection 11c is provided on the rear surface of the base end wall 11a of the fixed scroll 11, and the rear housing 4 has an annular projection 11c.
A chamber is formed by forming a ridge 4a opposed to c, and the chamber is partitioned by a partition member 18 into a discharge chamber 19 and a muffler chamber 20. At the center of the base end wall 11 a of the fixed scroll 11, the discharge valve 21 is communicated with the discharge chamber 19.
The discharge port 22 is formed so as to be openable. In addition, the muffler chamber 20 is provided in the ridge 4a at the discharge port 2
A communication hole (not shown) for communicating with the chamber 24 in which 3 is provided
Are formed.

As shown in FIG. 2, the partition member 18 has an engaging portion 25 that bulges in the center of the disk and serves as a retainer for the discharge valve 21. The tip of the engaging portion 25 is formed to have substantially the same length as the discharge valve 21 and a part thereof is curved to form a retainer shape. The engaging portion 25 has a fitting recess 26 formed on the back surface of the fixed scroll 11 and a through hole 21a of the discharge valve 21.
A fitting protrusion 27 is formed to penetrate through and be fitted.
Further, the partition member 18 is provided with a throttle passage 28 and a bolt 2 for fastening and fixing the rear housing 4 and the fixed scroll 11 together.
And a bolt insertion hole 30 through which 9 is inserted.
As the material of the partition member 18, a metal plate whose surface is covered with rubber is used.

In the compressor configured as described above, the discharge valve 21
The through hole 21a has a fitting recess 26 of the fixed scroll 11.
When the partition member 18 is capped on the annular projection 11c in a state of being arranged in a state corresponding to, and the rear housing 4 and the fixed scroll 11 are tightened and fixed by the bolt 29, the discharge valve 21 is pressed into a predetermined position by the partition member 18. The discharge chamber 19 and the muffler chamber 20 are partitioned and formed while being fixed.
That is, unlike the conventional device, the bolt for fixing the discharge valve 21 is not required, and the bolt hole is not required only by forming the fitting recess 26.

Further, the refrigerant gas compressed in the closed space P is discharged from the discharge port 22 into the discharge chamber 19 by the revolution of the movable scroll 10 during the operation of the compressor. Then, the refrigerant gas discharged to the discharge chamber 19 and expanded is throttled when passing through the throttle passage 28 formed in the partition member 18, and then the muffler chamber 2
When discharged into 0, it expands again. That is, the discharge gas is subjected to the throttling action and the expansion action, and the discharge pulsation is reduced.

Further, in this embodiment, since the partition member 18 is formed of a material in which the surface of the metal plate is covered with rubber, the sealing property and the vibration damping property are improved, and the discharge pulsation reducing effect is improved.

The present invention is not limited to the above embodiment,
For example, as shown in FIG. 3, instead of forming the through hole 21a in the discharge valve 21, a bent portion 21b is formed at the base end thereof, and the bent portion 21b is formed on the back surface of the base wall 11a. It is also possible to adopt a configuration in which the fitting valve 25 is not provided in the engaging portion 25 of the partitioning member 18 and the discharge valve 21 is pressed by the engaging portion 25 and fixed at a predetermined position. Further, the shape and position of the throttle passage 28 may be changed, and the material of the partition member 18 may be changed.

[Effects of the Invention] As described in detail above, according to the present invention, the muffler chamber is formed with a simple structure without increasing the size of the compressor, discharge pulsation is reduced, and the muffler chamber is partitioned. The discharge valve is pressed and fixed at a predetermined position by the member, and the processing of the bolt and the bolt hole for fixing the discharge valve becomes unnecessary.

[Brief description of drawings]

1 and 2 show an embodiment embodying the present invention. FIG. 1 is a sectional view, FIG. 2 is a perspective view of a partition member,
FIG. 3 is a sectional view of a main part of a modified example, and FIG. 4 is a partial sectional view of a conventional device. Housing 1, center housing 3, rear housing 4, protrusion 4a, movable scroll 10, fixed scroll 1
1, base end walls 10a and 11a, spiral portions 10b and 11b, partition member 18, discharge chamber 19, muffler chamber 20, discharge valve 2
1, discharge port 22, engaging portion 25, throttle passage 28, bolt 2
9, closed space P.

Claims (1)

[Scope of utility model registration request] 1. A hermetically sealed space, which is reduced in volume based on the revolution of a movable scroll, is provided between a fixed scroll housed in a housing and a movable scroll that is provided so as to be non-rotatable and revolvable so as to face the fixed scroll. In a scroll compressor to be formed, a rear housing is joined and fixed to a rear portion of a fixed scroll by a bolt to form a chamber between the fixed scroll and the rear housing, and the chamber is sandwiched between the fixed scroll and the rear housing. Partitioning member that divides the discharge chamber and the muffler chamber and communicates with each other through a throttle passage, and a retainer-shaped engaging portion of the discharge valve is formed in a part of the dividing member, and a part of the engaging portion forms the discharge valve. A scroll type compressor in which the discharge valve is fixed by pressing it against the back surface of the base wall of the fixed scroll.