JPH0942175A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a scroll compressor by providing the end plate of a fixed scroll with a hole to make a high and a low pressure side communicate mutually and moreover a high pressure relief valve in the above hole. SOLUTION: A high pressure relief valve 60 is composed of a ball 62 to abut on a seating face 61 formed in a hole 66, a spring 63 to press energize the ball 62 toward the seating face 61 under fixed setting force, and a spring support 64 to support the one end of the spring 63. During the operation of a scroll compressor, a difference between pressure on a high pressure side 46 and that on a low pressure side 47 attains a fixed value, the ball 62 of the high pressure relief valve 60 separates from the seating face 61 against the bursting force of the spring 63, and the gas on the high pressure side 46 passes through the hole 66 and the high pressure relief valve 60 and flows to the low pressure side 47. The pressure on the high pressure side does not therefore rise above a prescribed pressure for preventing the damage of a scroll compressor.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a scroll compressor incorporated in an air conditioner or the like.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG. In FIG. 2, reference numeral 4 denotes a housing, which includes a cup-shaped right housing 49, a frame 5, and a cup-shaped left housing 43, which are fastened together by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll compression mechanism C is provided inside the left housing 43.

The electric motor M and the scroll type compression mechanism C are interlockingly connected to each other via a rotary shaft 3. The right end of the rotary shaft 3 is supported by the right housing 49 via a sub bearing 51, and the left end is supported by the frame 5 via a main bearing 52.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, an Oldham link 6 for preventing the orbiting scroll 2 from rotating.

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. The outer peripheral surface of the end plate 11 is brought into close contact with the inner peripheral surface of the left housing 43 so that the inside of the housing 4 is closed. Is divided into a low pressure side and a high pressure side.

A discharge port 13 is formed in the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17. The fixed scroll 1 is fastened to the left housing 43 by screwing a bolt 57 into the protrusion 15 protruding leftward from the outer surface 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 32 is provided in the orbiting bearing in a boss 23 which is erected on the center of the outer surface of the end plate 21. It is rotatably fitted through 34. An eccentric drive pin 31 eccentrically provided at the left end of the rotary shaft 3 is slidably fitted in a slide groove 33 formed in the drive bush 32.

An Oldham link 6 is interposed between the end plate 21 and the frame 5, and the outer surface of the end plate 21 is a thrust bearing.
Sliding contact with the left end surface of the frame 5 via 53.

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 meshing them by shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, the eccentric drive pin 31, the drive bush 32, and the slewing bearing 3 are driven.
The orbiting scroll 2 is driven via an orbiting drive mechanism including a boss 23, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius while being prevented from rotating by the Oldham link 6.

Then, a low-temperature refrigerant gas containing mist-like lubricating oil enters the low-pressure chamber 48 via the suction port 44, and this gas passes through a passage 58 provided on the outer periphery of the stator Mb and the stator Mb.
After cooling the electric motor M while passing through the gap 59 between the rotor Ma and the rotor Ma, the passage 54 and the suction chamber 47 provided in the frame 5 are provided.
Is sucked into the closed space 24 through.

Then, as the volume of the closed space 24 decreases due to the orbital movement of the orbiting scroll 2, it reaches the center while being compressed, and the discharge valve 17 is pushed open from the discharge port 13 and discharged into the discharge chamber 46. From there, it flows out through the discharge port 45.

[0014]

When the air conditioner incorporating the conventional scroll compressor described above is in operation, when the pressure of the high pressure refrigerant in the refrigerant circuit abnormally rises due to the stop of the condenser fan or the like, the high pressure is increased. Activate the protective device,
When this high-pressure protection device failed, the high-pressure relief valve was opened to prevent damage to the scroll compressor.
This has a problem that the cost increases.

[0015]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to house a scroll type compression mechanism including a fixed scroll and an orbiting scroll in a housing. A scroll compressor that is installed and divides the inside of the housing into a low pressure side and a high pressure side by an end plate of the fixed scroll and discharges a compressed gas from a discharge port provided in the end plate of the fixed scroll on the high pressure side, The scroll compressor is characterized in that an end plate of the fixed scroll is provided with a hole communicating between the high pressure side and the low pressure side, and a high pressure relief valve is provided in the hole.

Another feature of the present invention is that the high pressure relief valve comprises a ball that abuts a seating surface formed in the hole, and a spring that presses the ball against the seating surface with a predetermined set force. Especially.

However, when the pressure on the high pressure side exceeds a predetermined pressure and rises, the high pressure relief valve opens and the compressed gas on the high pressure side flows into the low pressure side through the hole and the high pressure relief valve. The pressure on the high pressure side is maintained below a predetermined pressure.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention is shown in FIG. 1, where (A) is a partial longitudinal sectional view and (B) is an enlarged view of a B portion of (A). As shown in FIG. 1 (A), the end plate of the fixed scroll 1
A hole 66 that communicates the high-pressure side 46 and the low-pressure side 47 is provided in the hole 11, and a high-pressure relief valve 60 is provided in the hole 66.

The high pressure relief valve 60, as shown in FIG. 1 (B), has a ball 62 that abuts a seating surface 61 formed in a hole 66.
And a spring 63 that presses and urges the ball 62 against the seating surface 61 with a predetermined set force, a spring receiver 64 that supports one end of the spring 63, and the like. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

However, when the scroll compressor is in operation, when the difference between the pressure HP in the discharge side 46 and the pressure LP in the low pressure side 47 reaches a predetermined value, for example, 42 Kg / cm ² , the high pressure relief valve 60 operates. The ball 62 separates from the seating surface 61 against the elastic force of the spring 63, and the gas in the discharge side 46 flows into the low pressure side 47 through the hole 66 and the high pressure relief valve 60.

[0021]

According to the present invention, when the pressure on the high pressure side exceeds a predetermined pressure and rises, the high pressure relief valve opens, and the compressed gas on the high pressure side passes through the hole and the high pressure relief valve to the low pressure side. Since it flows in, the pressure on the high-pressure side does not rise above the predetermined pressure, and therefore damage to the scroll compressor can be prevented.

If the high pressure relief valve is composed of a ball that abuts on the seating surface formed in the hole and a spring that biases the ball against the seating surface with a predetermined set force, the structure is extremely simple and compact, It can be manufactured at low cost.

[Brief description of drawings]

1 is an embodiment of the present invention shown in FIG. 1, (A) is a partial vertical cross-sectional view, (B) is an enlarged view of part B of (A).

FIG. 2 is a vertical sectional view of a conventional scroll compressor.

[Explanation of symbols]

 4 Housing C Scroll type compression mechanism 1 Fixed scroll 11 End plate 13 Discharge port 47 Low pressure side 46 High pressure side 66 hole 60 High pressure relief valve 61 Seating surface 62 Ball 63 Spring

Claims (2)

[Claims] 1. A scroll type compression mechanism comprising a fixed scroll and an orbiting scroll is housed and installed in a housing,
A scroll compressor for partitioning the inside of the housing into a low pressure side and a high pressure side by the end plate of the fixed scroll and discharging compressed gas from a discharge port provided in the end plate of the fixed scroll on the high pressure side, A scroll compressor characterized in that an end plate is provided with a hole communicating between the high pressure side and the low pressure side, and a high pressure relief valve is provided in the hole. 2. The high pressure relief valve comprises a ball that abuts against a seating surface formed in the hole, and a spring that presses and urges the ball against the seating surface with a predetermined set force. Item 1. The scroll compressor according to Item 1.