JPH0914162A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE: To suppress the occurrence of excitation and the generation of impact noise by a method wherein when a delivery valve closes a delivery hole, the generation of a compact is reduced through collision of the tip of the delivery valve with the upper surface of the discharge cover. CONSTITUTION: By lengthening the length of a delivery valve 170 formed of a resilient plate, one end in a longitudinal direction thereof is fixed to a discharge cover 31 and an opening closing part for a delivery hole 14 is formed at the central part in a longitudinal direction thereof.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hermetic scroll compressor.

[0002]

2. Description of the Related Art One example of a conventional hermetic scroll compressor is shown in FIGS. In FIG. 6, the interior of the closed housing 8 is divided into a high pressure side 44 and a low pressure side 45 by a discharge cover 31. On the low pressure side 45, a scroll type compression mechanism C is provided on the upper side and an electric motor M is provided on the lower side.
Are provided, and these are interlockingly connected to each other via a rotary shaft 5.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 5,
The stator Mb is fixed by being pressed into the closed housing 8.

The scroll type compression mechanism C is a frame to which the fixed scroll 1, the orbiting scroll 2, the rotation preventing mechanism 3 such as an Oldham ring which allows the revolving movement of the orbiting scroll 2 but prevents its rotation, and the fixed scroll 1. 6, an upper bearing 71, a lower bearing 72, and the like that pivotally support the rotary shaft 5.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and a discharge port 13 is provided at the center of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 which is erected on the inner surface of the end plate 21, and a drive bush 54 is disposed in a boss 23 which is erected on the outer surface of the end plate 21 via an orbiting bearing 73. Is rotatably inserted. An eccentric pin 53 projecting from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54.

The fixed scroll 1 and the orbiting scroll 2 are engaged with each other to form a spiral wrap 12
A plurality of pairs of compression chambers 24, which are substantially symmetrical with respect to the center of the vortex winding, are formed by line contact of the side faces of the 22 at several places.

A discharge hole 14 communicating with the discharge port 13 is formed in the center of the discharge cover 31.
Valve 17 that opens and closes the valve and the valve retainer that regulates the valve opening height
The base end of 18 is fixed to the upper surface of the discharge cover 31 by a bolt 19.

An oil pump 51 is installed at the lower end of the rotary shaft 5, and the suction port 56 of the oil pump 51 is a closed housing 8.
The discharge port 57 opens at the bottom of the rotary shaft 5 and communicates with the oil supply hole 52 formed in the rotary shaft 5.

By driving the electric motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 54, and the boss 23.
The orbiting scroll 2 is driven by the orbiting mechanism composed of, for example, and the orbiting scroll 2 revolves on a circular orbit having a radius of the revolution revolution radius while being prevented from rotating by the rotation inhibiting mechanism 3.

Then, the gas enters the low pressure side 45 through the suction pipe 82 and is sucked into the compression chamber 24 through the passage 61 and the suction chamber 43. Then, this gas reaches the center while being compressed as the volume of the compression chamber 24 decreases due to the orbiting motion of the orbiting scroll 2, and when the compression chamber 24 communicates with the discharge port 13, the compressed gas is discharged into the discharge port 13. The discharge valve 17 is pushed open by passing through the cavity 58 and the discharge hole 14 in this order, enters the high pressure side 44, and is discharged from there through the discharge pipe 83.

At the same time, the lubricating oil stored in the bottom portion of the closed housing 8 is sucked up by the oil pump 51 from the suction port 56, passes through the discharge port 57 and the oil supply hole 52, and the lower bearing 72,
It is supplied to the sliding parts such as the upper bearing 71, the eccentric pin 53, the slewing bearing 73, etc., and lubricates them.

[0013]

In the conventional scroll compressor described above, the base ends of the discharge valve 17 and the valve retainer 18 are shown in FIG.
Bolt 19 on top of discharge cover 31 as shown in
Since the discharge hole 14 is opened and closed near the tip of the discharge valve 17, the tip of the discharge valve 17 collides with the upper surface of the discharge cover 31 and vibrates it at the moment of closing the valve. A loud impact sound is generated. In particular, there is a problem that the higher the compression ratio of the compressor, the larger the valve opening height of the discharge valve 17, the larger the impact noise, and the more noise.

[0014]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems. The gist of the present invention is to divide the inside of a hermetically sealed housing into a low pressure side and a high pressure side by a discharge cover. A scroll compression mechanism that forms a pair of compression chambers by engaging a fixed scroll and an orbiting scroll on the low pressure side is installed, and a discharge port that discharges the gas compressed in the compression chamber is provided in the central portion of the fixed scroll. In a hermetic scroll compressor that discharges compressed gas to the high pressure side through the discharge port and the discharge hole by providing a discharge hole communicating with the discharge port in the discharge cover, one end in the longitudinal direction is fixed to the discharge cover. An opening and closing part of the discharge hole shall be formed near the center of the elastic plate in the longitudinal direction. The discharge valve is in hermetic scroll compressor, characterized in that installed in the high-pressure side.

Another feature of the present invention is that a valve retainer for regulating the valve opening height of the discharge valve is provided, and the valve retainer can be separated from the discharge cover only near the discharge hole opening / closing portion of the discharge valve. It has been formed into a shape.

[0016]

In the present invention, during normal operation of the compressor, the discharge valve has a discharge hole in the vicinity of the center in the longitudinal direction thereof which is separated from the discharge cover to open the discharge hole, and the tip of the discharge valve is hardly separated from the discharge cover. by this,
The valve opening height at the tip of the discharge valve is reduced, and the impact noise when the discharge valve is closed can be greatly reduced.

According to the second aspect of the invention, since only the vicinity of the discharge hole opening / closing portion of the discharge valve is separated from the discharge cover by being regulated by the valve retainer, the impact noise when the discharge valve is closed can be further reduced. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIGS. As shown in FIGS. 1 and 2, the discharge valve 170 and the valve retainer 180 are appropriately longer than those of the conventional one, and the base ends thereof are fixed to the upper surface of the discharge cover 31 by the bolts 19, and the length of the discharge valve 170 is increased. 14 near the center of the direction
The opening and closing part of is formed. Other configurations are shown in FIGS.
The same reference numerals are given to corresponding members, and description thereof will be omitted.

When the orbiting scroll 2 orbits the orbiting scroll 2, the volume of the compression chamber 24 gradually decreases to reach the central portion and the pair of compression chambers 24 communicate with the discharge port 13.
The gas compressed in 24 passes through the discharge port 13 through the cavity 58 and the discharge hole 14, opens the discharge valve 170, and enters the high pressure side 44.
It is discharged to the outside through the discharge pipe 83.

At this time, the discharge valve 170 is elastically deformed near the center in the longitudinal direction and separated from the discharge cover 31 to open the discharge hole 14, but the tip of the discharge valve 170 is hardly separated from the discharge cover 31 and is separated from the discharge cover 31. The distance is greatly reduced compared to the conventional one. Therefore, the impact when the tip of the discharge valve 170 collides with the discharge cover 31 when the discharge valve 170 is closed is reduced, and as a result, almost no vibration is applied to the discharge cover 31, and the impact noise can be greatly reduced. .

Further, the discharge hole 31 is formed in the discharge cover 31.
By providing the compressed gas in the discharge port 13, the compressed gas is expanded in the cavity 58, and is compressed again when passing through the discharge hole 14, so that the discharge gas passage of the compressed gas can have a muffler effect, It is possible to reduce discharge pulsation and noise.

Further, by mounting the discharge valve 170 on the upper surface of the discharge cover 31, the discharge port 13, the cavity
Since the top clearance volume consisting of the discharge hole 14 and the discharge hole 14 can be increased, the inside of the cavity 58 when the pair of compression chambers 24 moves to the center side of the spiral and communicates with the central chamber connected to the discharge port 13 Since the pressure drop can be reduced and the pressure difference between both sides of the discharge valve 170 can be reduced as shown in FIG. 3, the impact noise when the discharge valve 170 is closed can be reduced.

A second embodiment of the invention is shown in FIG. In the second embodiment, the cross section of the valve retainer 181 is formed so that only the vicinity of the opening / closing portion of the discharge hole 14 of the discharge valve 171 can be separated from the discharge cover 31.
The gap between the tip of the discharge valve 31 and the discharge cover 31
Is almost equal to the thickness of.

Thus, the shape of the discharge valve 171 when opened is regulated by the valve retainer 181 and the tip of the discharge valve 171 remains in contact with the discharge cover 31. Therefore,
The impact noise generated when the discharge valve 171 is closed can be reduced more reliably.

[0025]

According to the present invention, the vicinity of the center of the discharge valve in the longitudinal direction is elastically deformed to separate from the discharge cover to open the discharge hole. At this time, the tip of the discharge valve is hardly separated from the discharge cover. The discharge cover is hardly vibrated at the tip of the discharge valve when the discharge valve is closed, so that the impact noise can be greatly reduced.

In the second aspect, only the vicinity of the opening / closing portion of the discharge hole of the discharge valve is separated from the discharge cover.
Since the tip of the discharge valve is held in contact with the discharge cover by the valve retainer, the impact noise when the discharge valve is opened can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional view of a hermetic scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of the discharge valve mechanism of the above embodiment,
(A) is a plan view of the discharge valve, and (B) is a partial vertical sectional view.

FIG. 3 is a diagram showing a pressure change in the above embodiment.

FIG. 4 is a partially enlarged view of a discharge valve mechanism according to a second embodiment of the present invention, (A) is a plan view of the discharge valve, and (B) is a partial vertical sectional view.

FIG. 5 is a partially enlarged view of a discharge valve mechanism of the conventional compressor, (A) is a plan view of the discharge valve, and (B) is a partial vertical sectional view.

FIG. 6 is a vertical sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

 1 Fixed scroll 2 Orbiting scroll 3 Rotation prevention mechanism 8 Closed housing 13 Discharge port 14 Discharge hole 170 Discharge valve 180 Valve retainer 24 Compression chamber 31 Discharge cover 44 High pressure side 45 Low pressure side

Front Page Continuation (72) Inventor Masumi Sekita 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya City Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) Takayuki Suzuki 1 Takamichi, Iwatsuka-cho, Nakamura-ku, Nagoya Mitsubishi Heavy Industries Ltd. Company Nagoya Institute

Claims (2)

[Claims] 1. A scroll compression mechanism for partitioning the interior of a closed housing into a low pressure side and a high pressure side by a discharge cover, and forming a pair of compression chambers by engaging a fixed scroll and an orbiting scroll on the low pressure side. A discharge port for discharging the gas compressed in the chamber is provided in the central portion of the fixed scroll, and a discharge hole communicating with the discharge port is provided in the discharge cover to allow compressed gas to pass through the discharge port and the discharge hole and to the high pressure side. In a hermetic scroll compressor that discharges to the discharge valve, a discharge valve, which is made of an elastic plate having one end in the longitudinal direction fixed to the discharge cover and has an opening / closing portion of the discharge hole near the center in the longitudinal direction, is provided on the high pressure side. A hermetic scroll compressor characterized by being installed. 2. A valve retainer for regulating the valve opening height of the discharge valve is provided, and the valve retainer is formed in a cross-sectional shape that can be separated from the discharge cover only in the vicinity of the discharge hole opening / closing portion of the discharge valve. The hermetic scroll compressor according to claim 1, which is characterized in that.