JPH05231351A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To reduce a number of part items, assembly labor hours and the cost by moving a valve unit of a delivery valve by a pressure difference between compression mechanism and high pressure sides, opening/closing a passage of connecting these sides and also impeding a reverse flow of gas to the compression mechanism side from the high pressure side by a stopper part. CONSTITUTION:A delivery valve 90 is arranged in a boundary part between a discharge cover 31 of partitioning the inside of a closed housing 8 into high/ low pressure sides 44, 43 and a fixed scroll 1 arranged in the low pressure side 43 to constitute a compression mechanism C with a turning scroll. Here in the delivery valve 90, a valve unit 94 moved by a pressure difference between the compression mechanism C and the high pressure side 44 is arranged in a passage 93 connected thereto. When the valve element 94 is moved to the high pressure side 44, the valve element 94 is stopped by the first stopper part 95 and also circulating gas from a gas groove 97. On the other hand, when the valve element 94 is moved to the compression mechanism C, the valve element 94 is stopped by the second stopper part 96 and also interrupting circulation of gas in the gas groove 97.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view of an example of a conventional scroll compressor. In the figure, the inside of the closed housing 8 is provided with a discharge cover 31 so that the high pressure side space
And the low-pressure side space 45. Low pressure side space 45
A scroll-type compression mechanism C is arranged in the upper part of the inside of the, and an electric motor (not shown) is arranged in the lower part thereof, and these are interlockingly connected to each other via a rotary shaft 5.

The scroll compression mechanism C comprises a fixed scroll 1 and an orbiting scroll 2 which mesh with each other.
The fixed scroll 1 includes 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. Orbiting scroll 2
Is an end plate 21 and a spiral wrap 22 provided upright on the inner surface thereof.
The drive bush 54 is rotatably fitted into the boss 23 provided upright on the outer surface of the end plate 21 through the swivel bearing 73, and is rotated in the hole 55 formed in the drive bush 54. An eccentric pin 53 protruding from the upper end of the shaft 5 is slidably fitted. A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance, and engaging them with each other while shifting the angle by 180 degrees.

A frame 6 is fixed in the closed housing 8 by plug welding, and the fixed scroll 1 is fastened to the frame 6 by bolts 9.
The orbiting scroll 2 is slidably supported above. Between the orbiting scroll 2 and the frame 6, a rotation preventing mechanism 3 including an Oldham link or the like for allowing the orbiting motion of the orbiting scroll 2 but preventing its rotation is arranged. The rotating shaft 5 is attached to the upper bearing 71 provided on the frame 6.
Is supported.

In a passage 33 formed between the fixed scroll 1 and the discharge cover 31, a reference numeral 17 described later is provided.
A discharge valve 17 including members a to 17d is installed. That is, an annular valve seat 17a is arranged in the passage 33, and a disc-shaped valve body 17b is placed on the valve seat 17a. This valve body 17b is covered with a gap, and the stop ring 1
A stopper 17d fixed to a fixed position by 7c is attached, and this stopper 17d is provided with an opening (not shown) communicating with the high pressure side 44. Thus, the discharge valve 17 opens and closes the passage 33 by vertically moving the valve body 17b according to the pressure difference between the compression mechanism C and the high pressure side 44.

When the rotary shaft 5 rotates, the eccentric pin 5
The orbiting scroll 2 is driven by an orbiting drive mechanism composed of 3, a drive bush 54, a boss 23, etc., and the orbiting scroll 2 revolves on a circular orbit having a radius of a revolution revolution radius while being prevented from rotating. Then, the gas enters the low pressure side space 45 from a suction pipe (not shown), enters the low pressure chamber 43 through the gas passage 61, and is sucked into the closed space 24. Then, as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and passes through the discharge port 13 to reach the discharge valve 1.
7 is opened and enters the high pressure side space 44, from which the discharge pipe 8
It is discharged to the outside after passing through 3. On the other hand, when the operation of the compressor is stopped, the discharge valve 17 is closed to prevent the gas from flowing back from the high pressure side 44 into the compression mechanism C, thereby preventing the rotating shaft 5 from rotating in the reverse direction.

[0007]

The conventional scroll type compressor described above is provided with the discharge valve 17 which opens and closes based on the pressure difference between the compression mechanism C and the high pressure side 44. The discharge valve 17 is a valve. The seat 17a, the valve body 17b, the retaining ring 17c, and the stopper 17d are included, and the number of parts and the number of assembling steps are large.

Although there is a valve using the reed valve 18 shown in FIG. 4 as a discharge valve, the valve plate 18a for opening and closing the discharge port 13, the retainer 18b for restricting the open position of the valve plate 18a, and the retainer 18b are fixed. Bolt 18c
Similarly, there is a drawback that the number of parts and the number of assembling steps are large.

The present invention aims to solve the above-mentioned drawbacks of the prior art, to provide a scroll type fluid machine having a discharge valve with a small number of parts and a reduced number of assembly steps, and to reduce the cost.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the inside of a hermetically sealed housing is divided into a high pressure side and a low pressure side by a discharge cover, and a fixed scroll and an orbiting scroll are engaged on the low pressure side. In a scroll type fluid machine that accommodates a compression mechanism configured together, a discharge valve is formed at the boundary between the discharge cover and the fixed scroll, and the discharge valve is a passage that connects the compression mechanism and the high pressure side. , A valve element housed in the passage that moves based on the pressure difference between the compression mechanism and the high pressure side, and a valve element provided in the passage that stops the valve element when the valve element moves to the high pressure side. Is a first stopper portion that is circulated through a gas groove provided in the vicinity, and stops the valve body provided in the passage when the valve body moves toward the compression mechanism and Distribution also relates scroll fluid machine according to claim which is composed of the second stopper portions for blocking.

[0011]

Since the present invention has the above-mentioned structure, the passage is opened and closed by moving the valve element based on the pressure difference between the compression mechanism and the high pressure side. That is, when the pressure of the compression mechanism is higher than the high pressure side, the valve element moves and stops at the first stopper portion, and the gas discharged from the compression mechanism flows out to the high pressure side through the passage and the gas groove. To do. On the other hand, when the pressure on the high pressure side is higher than that on the compression mechanism, the valve body moves and stops at the second stopper portion to close the passage, thereby preventing the reverse flow of gas from the high pressure side to the compression mechanism.

[0012]

FIG. 1 is a vertical sectional view showing a main part of a scroll type compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A of FIG. In the figure, 8 is a closed housing, C is a compression mechanism, 1 is a fixed scroll of the same compression mechanism, 13 is a discharge port provided in the fixed scroll, 31 is a discharge cover provided on the discharge side of the fixed scroll, and 32 is A seal ring provided at a contact portion between the fixed scroll and the discharge cover, 90 is a discharge valve formed between the fixed scroll and the discharge cover, and 44 is a high pressure side space outside the discharge valve. The discharge valve 90 has a passage 93,
Valve body 94, first stopper portion 95, second stopper portion 9
6 and the gas groove 97.

A valve body 94 made of a material such as steel or resin is accommodated in the passage 93. As shown in the figure, the valve body 94 can have various shapes such as a spherical shape and a cylindrical shape, and freely moves in the passage 93 based on the pressure difference between the compression mechanism C and the high pressure side 44. The passage 93 is provided with a first stopper portion 95 in the high pressure side 44 direction and a second stopper portion 96 in the compression mechanism C direction. The first stopper portion 95 has a conical shape whose inner diameter decreases toward the high pressure side 44, and the valve element 94 stops there. The second stopper portion 96 has a conical shape whose inner diameter decreases toward the discharge port 13 formed in the fixed scroll 1, and when the valve body 94 stops there, the passage 9 is formed.
3 is closed. Here, the opening of the discharge port 13 can be directly used as the second stopper 96. A passage 93 is provided in the discharge cover 31.
And a gas groove 97 that communicates with the high-pressure side 44. The first and second stopper portions 95 and 96 and the gas groove 97 are used for the fixed scroll 1 and the discharge cover 31.
Can be formed and processed at the same time when it is formed by forging, casting, sheet metal punching or the like. Other configurations are the same as the conventional one shown in FIG.

In this embodiment, the discharge valve 90 opens and closes the passage 93 by moving the valve body 94 in the vertical direction based on the pressure difference between the compression mechanism C and the high pressure side 44. That is,
When the pressure of the compression mechanism C is higher than that on the high pressure side 44, the valve element 94 moves as shown by the solid line in the drawing to move the first stopper portion 95.
The gas discharged from the compression mechanism C flows out to the high pressure side 44 through the discharge port 13, the passage 93 and the gas groove 97. On the other hand, when the pressure on the high-pressure side 44 is higher than that of the compression mechanism C, the valve body 94 moves as shown by the broken line in the drawing and the second
The passage 93 is closed by stopping at the stopper portion 96 to prevent the reverse flow of gas from the high pressure side 44 to the compression mechanism C.

In this way, in the discharge valve 90 of this embodiment, the passage 93, the valve body 94, and the first stopper portion 9 are provided.
5, the second stopper portion 96, and the gas groove 97, the first and second stopper portions 95, 96 and the gas groove 97 are used when the fixed scroll 1 and the discharge cover 31 are formed. The number of parts is reduced because it can be processed at the same time. Further, in the process of assembling the compressor, it is sufficient to simply store the valve body 94 in the passage 93, which simplifies the assembling work and reduces the cost. Can be reduced.

[0016]

In the scroll type fluid machine of the present invention, a discharge valve is formed at a boundary portion between the discharge cover and the fixed scroll, and the discharge valve connects the compression mechanism and the high pressure side with each other. A valve body housed in the passage and moving based on the pressure difference between the compression mechanism and the high pressure side, and the valve body provided in the passage and stopped when the valve body moves to the high pressure side, but the gas is in the vicinity A first stopper portion that circulates from a gas groove that is provided in the second passage, and a second stopper that is provided in the passage and that stops the valve body when the valve body moves toward the compression mechanism and also blocks the flow of gas. Since it is composed of the parts, the number of parts of the discharge valve can be reduced, and the number of assembling steps and cost of the scroll fluid machine can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional view of an example of a conventional scroll compressor.

FIG. 4 is a cross-sectional view of another example of a conventional discharge valve.

[Explanation of symbols]

 C compression mechanism 1 fixed scroll 2 orbiting scroll 8 hermetic housing 31 discharge cover 44 high pressure side 45 low pressure side 90 discharge valve 93 passage 94 valve body 95 first stopper portion 96 second stopper portion 97 gas groove

Claims (1)

[Claims] 1. A scroll type fluid machine in which a hermetically sealed housing is partitioned into a high pressure side and a low pressure side by a discharge cover, and a compression mechanism constituted by meshing a fixed scroll and an orbiting scroll on the low pressure side is housed.
A discharge valve is formed at a boundary portion between the discharge cover and the fixed scroll, and the discharge valve is a passage that connects the compression mechanism and the high-pressure side, and is housed in the passage to connect the compression mechanism and the high-pressure side. A valve body that moves based on a pressure difference, and a first stopper portion that is provided in the passage and stops the valve body when the valve body moves to a high pressure side, but allows gas to flow from a gas groove provided in the vicinity. And a second stopper portion which is provided in the passage and stops the valve body when the valve body moves toward the compression mechanism and also blocks the flow of gas. Fluid machinery.