JPH08548Y2 - Rotary compressor capacity controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to improvement of a capacity control device for a rotary compressor.

(B) Prior art A conventional capacity control device for a rotary compressor is, for example, SAIKAI 57-1.
It is constructed as shown in Japanese Patent No. 39691. Here, a conventional example will be described with reference to this publication. In FIGS. 5 and 6, 50 is a closed container in which a rotary compression element 51 is housed. The rotary compression element 51 includes a cylinder 52, a roller 55 that rotates in the cylinder 52 by an eccentric portion 54 of a rotary shaft 53, a vane 56 that contacts the roller 55 and divides the cylinder 52 into a high pressure chamber and a low pressure chamber, and a cylinder. It is composed of an upper bearing portion 57 and a lower bearing portion 58 that seal the opening of 52. Numerals 59 and 60 are suction holes and discharge holes provided in proximity to both sides of the vane 56. The upper bearing portion 57 is provided with a lead-out hole 61 that opens in the cylinder 52 facing the vane 56 and penetrates in the axial direction. The cylinder 52 is
A valve seat 62, a capacity control valve 63 that opens and closes the valve seat, and a stopper 64 that restricts the opening of the capacity control valve are provided on the side. The capacity control valve 63 is a flat plate and is formed slightly smaller than the lead-out hole 61. In the upper bearing portion 57, a communication passage 65 that is orthogonal to the outlet hole 61 and communicates with the high-pressure side and the low-pressure side of an external cooling circuit (not shown) by switching with a switching valve (not shown).
Is provided.

In the rotary compressor of this structure, the upper bearing portion 57 is provided with a lead-out hole 61 and a communication passage 65, and a capacity control valve 63 is arranged in the lead-out hole to flow into the cylinder 52, and is compressed and discharged from the discharge hole 60. The amount of refrigerant to be stored is adjusted so that the rotary compressor is operated in capacity control.

(C) Problems to be Solved by the Invention However, since the capacity control valve 63 moving in the outlet hole 61 is made of a metal harder than the material forming the upper bearing portion 57, the capacity of the outlet hole 57 during the capacity control operation is increased. There is a problem that the upper bearing part 57 is scraped by coming into contact with the wall and the sliding parts are abraded by the shavings.

This invention solves the above-mentioned problem, and aims to improve the wear resistance of the contact portion with the displacement control valve by providing a protective member in the sliding guide hole of the displacement control valve. .

(D) Means for Solving the Problems This invention provides a frame body with a lead-out hole communicating with the inside of a cylinder and a communication passage communicating with the lead-out hole at a right angle, and a flat capacity control valve is provided in the lead-out hole. It is arranged so as to be slidable, a protective member having a C-shaped cross section, one of which is separated, is attached to the inner wall of the lead-out hole around the capacity control valve, and the separated portion of the protective member is opposed to the communication passage. .

(E) Action The present invention configured as described above prevents the capacity control valve from contacting the wall of the lead-out hole with the protective member, and the lead-out hole and the communication passage are separated from each other by the cutout portion of the protective member. The capacity control valve prevents the wall of the outlet hole from being shaved, and the protective member prevents the passage from being blocked.

(F) Embodiment Hereinafter, the present invention will be described based on an embodiment shown in FIGS. 1 to 4.

Reference numeral 1 is a rotary compressor, 2 is a condenser, 3 is a decompression device, and 4 is an evaporator, which are sequentially connected to form a refrigeration cycle. Reference numeral 5 denotes a bypass pipe that communicates with the intermediate pressure portion of the rotary compressor 1, and this bypass pipe switches the intermediate pressure portion to the high pressure portion on the inlet side of the condenser 2 and the low pressure portion on the outlet side of the evaporator 4. A valve 6 is provided. The rotary compressor 1 includes a closed container 7, an electric element 9 having a rotary shaft 8 housed in the container, and a rotary compression element 10 driven by the rotary shaft 8 of the electric element. The rotary compression element 10 includes a cylinder 11 and an eccentric portion 12 of the rotary shaft 8 to make the cylinder 11
The roller 13 that rotates inside and the cylinder that contacts this roller
It is composed of a vane 14 that divides the inside of the chamber 11 into a low pressure chamber and a high pressure chamber, an upper bearing portion 15 and a lower bearing portion 16 that seal the opening of the cylinder 11, and a discharge valve 17 provided in this upper bearing portion. The cylinder 11 is provided with a suction hole 18 communicating with the low pressure chamber.
The upper bearing portion 15 is provided with a discharge valve 19 communicating with the high pressure chamber and opened and closed by a discharge valve 17. The suction hole 18 and the discharge hole 19 are provided so as to face each other on both sides of the vane 14.

Reference numeral 20 is a capacity control valve, and this capacity control valve is housed in a lead-out hole 21 provided so as to communicate with the intermediate pressure portion in the cylinder 11 facing the vane 14 of the lower bearing portion 16. The capacity control valve 20 contacts a valve seat 22 provided on the cylinder 11 side of the outlet hole 21,
Moreover, it is formed of a high hardness flat plate. 23 is a stopper that closes one end of the lead-out hole 21, and this stopper is a capacity control valve.
The opening of 20 is regulated. 24 is a connecting passage,
This communication passage is provided in the lower bearing portion 16 so as to be orthogonal to the outlet hole 21. The bypass pipe 5 is connected to the communication passage 24.

Reference numeral 25 is a protective member formed of a metal material having substantially the same hardness as that of the capacity control valve 20. This protective member has a cross section C with one side cut off.
It is formed in a letter shape and is attached to the inner wall of the lead-out hole 21 around the capacity control valve 20 by elastic force. Further, the protection member 25 has the cutoff portion 26 opposed to the communication passage 24, and the communication passage and the lead-out hole 21.
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In the displacement control device of the rotary compressor configured as above, when the switching valve 6 is switched to the inlet side of the condenser 2, high-pressure gas acts on the displacement control valve 20 from the bypass pipe 5, and this displacement control valve is The lead-out hole 21 and the inside of the cylinder 11 are blocked. Then, the refrigerant flowing from the suction hole 18 into the cylinder 11 of the rotary compression element 10 is compressed by the cooperation of the roller 13 and the vane 14 and is completely discharged from the discharge hole 19, so that the rotary compressor 1 is operated with a large capacity. I am trying to do it.

When the switching valve 6 is switched to the outlet side of the evaporator 4, low pressure gas acts on the capacity control valve 20 from the bypass pipe 5, and the capacity control valve is opened by the refrigerant in the cylinder 11. Then, a part of the refrigerant that has flowed into the cylinder 11 through the suction hole 18 passes through the outlet hole 21 and the communication passage 24, and the bypass pipe 5
Is discharged to the outlet side of the evaporator 4, compressed, and discharged into the discharge hole 19
The amount of refrigerant discharged from the compressor is reduced, and the rotary compressor 1 is operated with a small capacity.

By elastically attaching the protection member 25 to the inner wall of the outlet hole 21, even if the capacity control valve 20 repeats opening and closing operations, it does not come into direct contact with the lower bearing 16 and is prevented from being scraped by this capacity control valve. Has been done. Moreover, the protective member 25 is formed of the metal material having substantially the same hardness as the capacity control valve 20, so that the contact portion with the capacity control valve is not worn. In addition, the protective member 25 connects the disconnection portion 26 to the communication passage 24.
The connecting passage and the outlet hole 21 are provided by facing each other.
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(G) Effect of the device In the capacity control device for a compressor of the present invention, the frame body is provided with a lead-out hole communicating with the inside of the cylinder, and a communication passage communicating with the lead-out hole at right angles. A control valve is slidably arranged, a protective member having a C-shaped cross section, one of which is cut off, is attached to the inner wall of the outlet hole around the capacity control valve, and the cutoff portion of this protective member is opposed to the communication passage. Therefore, by attaching a protective member to the outlet hole around the displacement control valve, it is possible to prevent the wall of the outlet hole from being scraped by the displacement control valve. Moreover, by making the cut-off portion of the protection member face the communication passage, it is possible to prevent the protection member from blocking the passage.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a refrigeration circuit diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of a rotary compressor, and FIG. 3 is an enlarged sectional view of a main part of a capacity control device. FIG. 4 is a sectional view taken along the line AA of FIG. 3, FIG. 5 is a sectional view of a main part of a rotary compressor showing a conventional example, and FIG. 6 is an enlarged sectional view of a main part of the capacity control device. 7 ... airtight container, 10 ... rotary compression element, 11 ... cylinder, 13 ... roller, 15 ... upper bearing part, 16 ... lower bearing part,
20 …… Volume control valve, 21 …… Outlet hole, 24 …… Communication passage, 25
…… Protective member, 26 …… Separator.

Claims (1)

[Scope of utility model registration request] 1. A rotary compression element is housed in an airtight container, and the rotary compression element is composed of a cylinder, a roller that rotates in the cylinder, and a frame that seals the opening of the cylinder. In a rotary compressor in which a lead-out hole communicating with the inside of the cylinder and a communication passage communicating with the lead-out hole at right angles are provided, and a flat capacity control valve is slidably arranged in the lead-out hole, A protective member having a C-shaped cross section, one of which is cut off, is attached to the inner wall of the outlet hole around the control valve, and the protective member has a cut-off portion facing the communication passage. Control device.