JP2606454B2 - Scroll fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine used for, for example, a refrigeration system or an air conditioner.

[0002]

2. Description of the Related Art FIG. 4 and FIG.
FIG. 1 shows a conventional whole-system rotary scroll fluid machine disclosed in Japanese Unexamined Patent Publication No. 0089, wherein a drive scroll 1 is provided at an upper portion and constitutes a first scroll. A spiral projection 1a is provided on the lower surface,
Discharge port 1c is provided on the shaft center O _1, the drive shaft 1f upward
Are provided integrally or by sticking. 1d is an exhaust path constituting an axial communication port communicating with the discharge port 1c via a valve 24 described later, 1e is a plurality of discharge holes drilled in the radial direction, 2 is disposed below, and the second In the driven scroll constituting a scroll, a spiral projection 2a provided on an upper surface of a base plate 2b is combined with a spiral projection 1a, and a boss 2c is provided at a lower portion. Reference numeral 3 denotes a cylindrical container constituting a first container having an intake port 3a, 3b denotes a suction chamber thereof, and 3c denotes a bearing housing provided at a lower end of the container 3, and the driven scroll is provided via bearing portions 5 and 6. 2 is supported.

[0003] Reference numeral 24 denotes a valve provided at the discharge port 1c, which is stopped by a spring 25. 26 is fixed in the discharge port 1c, and is a valve receiver for supporting the spring 25, 27 is a washer for receiving the spring 25, 28 is a valve seat of the valve 24, which is sealed by an O-ring 29 and is prevented from falling off by a snap ring 30. I have. Reference numeral 31 denotes oil sealed in the container 3.

Next, the operation will be described. When the motor 21 is rotated, the drive scroll 1 is rotated about the axial center O ₁ , and the driven scroll 2 in which the spiral projection 2 a contacts the spiral projection 1 a is rotated following the axial center O _2. . By the rotation of both scrolls 1 and 2, gas suction, compression and discharge are performed.

Accordingly, by the rotation of the scrolls 1 and 2, gas is sucked from the suction port 3a, sucked into the suction chamber 3b, and enters the compression chamber A. The gas that has entered the compression chamber A is compressed by the movement of the compression chamber A toward the center, and is discharged from the discharge port 1c.

The valve 24 prevents the gas and oil compressed and discharged from the compression chamber A from returning to the compression chamber A from the atmospheric pressure chamber 7b, thereby improving the degree of vacuum. The position of the valve 24 is desirably provided at the discharge port 1c. The valve 24 is stopped by a spring 25 and positioned by a valve seat 28. Also, the valve receiver 26 has a hole in the center,
Through this hole, it reaches the exhaust path 1d.

[0007]

Since the conventional scroll fluid machine is constructed as described above, when the valve 24 is operated, the valve itself is tilted and the spring 25 is also tilted. Therefore, as shown in FIG. Interference with the valve receiver 26 causes problems such as cutout of the spring 25 and malfunction of the valve 24, and also a problem that a contact noise between the spring 25 and the valve receiver 26 is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a scroll fluid machine capable of preventing breakage of a spring or a valve and reducing noise.

[0009]

SUMMARY OF THE INVENTION A scroll fluid machine according to the present invention has a fixed scroll in which a spiral projection is provided on the lower surface of a base plate, and a discharge port is provided in the center of the base plate, and An orbiting scroll provided with a spiral projecting body and combined with the fixed scroll to form a compression chamber; and a valve mechanism provided at a discharge port of the fixed scroll to prevent movement of a working fluid from a high pressure side to a low pressure side. The valve mechanism includes a check valve for preventing the backflow of the working fluid, an urging member formed of a coil spring for pressing the check valve to close the discharge port, and a movement of the check valve and the urging member. In a scroll compressor provided with a restricting valve receiver, the valve receiver restricts a conical cylindrical portion that gradually projects in diameter in a check valve direction and a movement amount when the check valve is opened. Check the valve receiving surface at the lower end of the cylinder and the check valve in the axial direction. And a guide portion for regulating to move with constituting from those formed integrally, the coil
A biasing member made of a spring is fitted into the conical cylindrical portion of the valve receiver.
And characterized in that case.

[0010]

In the scroll fluid machine according to the present invention, the cylindrical portion of the valve receiver is formed in a conical shape narrowed in the check valve direction, and the check valve is moved in the axial direction by being restricted by the guide provided in the valve receiver. When the check valve is pushed up by the discharge of the compressed gas from the discharge port, even if the biasing member is tilted, it does not interfere with the valve receiver or the cylinder, and therefore the biasing is performed.
Damage to members or non-operation of the check valve can be prevented.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an entire scroll fluid machine according to the present invention.
Fixed scroll provided with a spiral projection 101b on the lower surface of the
Reference numeral 102 denotes an orbiting scroll provided with a spiral projecting portion 102b on the upper surface of a base plate portion 102a, and 102c denotes an orbiting shaft portion which projects downward at the center of the base plate portion 102a of the orbiting scroll 102; Is the fixed scroll 101
And an inlet formed in the outer peripheral portion of the orbiting scroll 102,
104 is a discharge port provided at the center of the base plate portion 101a of the fixed scroll 101, and 105 is
A spiral compression chamber 106 formed between the spiral projections 101b and 102b is a main shaft, and an eccentric hole 106b is provided in a large diameter portion 106a at the upper end.

[0012] 107 is disposed in the eccentric hole 106b,
A rocking bearing for supporting the rocking shaft portion 102c in a radial direction,
Reference numerals 108 and 109 denote a rotor and a stator of an electric motor that rotationally drives the main shaft 106; 110, an Oldham coupling for revolving so that the orbiting scroll 102 does not rotate when the main shaft 106 is rotationally driven; 111, a scroll mechanism unit described above. And a closed container 112 for accommodating the electric mechanism, and 112 is a suction pipe attached to the closed container 111.

Reference numeral 114 denotes the base 1 of the fixed scroll 101.
A discharge chamber 115 has an upper part connected to the upper wall of the sealed container 111 and a lower part fitted with the cylindrical part 114 to form a discharge chamber 116. The cover 117 is a discharge pipe attached to the discharge chamber cover 115 and communicates with the outside. 118 is a sealing material for airtightness between the cylindrical body 114 and the discharge chamber cover 115. 119 is a discharge port of the fixed scroll 101. 104
Is a check valve for opening and closing the valve seat 119.

Reference numeral 121 denotes a valve receiver for regulating the opening amount of the check valve 120. As shown in FIGS.
Conical cylindrical portion 121a that gradually narrows toward the 20 side
And a valve receiving surface 121b forming a tip of the cylindrical portion 121a.
And three equally spaced guide portions 121c that restrict the movement of the check valve 120 only in the axial direction. Reference numeral 122 denotes a biasing member formed of a coil spring having one end attached to the cylindrical portion 121a of the valve receiver 121.
0 is urged to the valve seat 119. 123 is a valve receiver 121
This is a retaining ring that regulates upward movement. In addition, 124 is an oil sump.

Next, the operation will be described. Rotor 108
Rotates, the main shaft 106 also rotates, and the Oldham coupling 110
The orbiting scroll 102 orbits via the. Thus, the gas sucked from the suction port 103 on the outer peripheral side into the compression chamber 105 between the spiral protrusions 101b and 102b of both scrolls is discharged from the discharge port 104 on the center side while being gradually compressed. Then, the discharged gas pushes up the check valve 120 against the force of the spring 122, and the passage 114a, the discharge chamber 1
The liquid is discharged from the discharge pipe 117 through the line 16. At this time, the movement of the check valve 120 is restricted only in the axial direction by the guide portion 121c of the valve receiver 121, and the check face 121
The movement amount of the check valve 120 is regulated by b, and the cylindrical portion 121a of the valve receiver 121 is formed in a tapered conical shape. There is no interference with the cylindrical portion 121a of the valve receiver 121, and therefore, the damage of the spring 122 and the associated malfunction of the check valve 120 can be eliminated.

[0016]

As described above, according to the present invention,
The urging member composed of the above-mentioned coil spring is fitted to a valve receiver that regulates the movement of the urging member composed of the check valve and the coil spring.
A conical cylindrical portion, a valve receiving surface for regulating the amount of movement of the check valve, and a guide portion for regulating the moving direction of the check valve. It eliminates interference, prevents damage to the biasing member, eliminates malfunctions of the check valve, and eliminates the contact noise between the biasing member and the valve receiver due to the valve opening / closing operation. High scroll fluid machine. The valve receiver has a conical cylindrical portion that gradually reduces in diameter in the check valve direction and protrudes, a valve receiving surface at the lower end of the cylindrical portion that regulates the amount of movement when the check valve is opened, and a check valve. Since the guide part that regulates the valve so that it can move only in the axial direction is formed integrally, the guide part is reliable in a state where the mutual position is securely held with other element members regulated by this. It can be operated efficiently and the overall valve configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll fluid machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a valve receiver.

FIG. 3 is a bottom view of the valve receiver.

FIG. 4 is a sectional view of a conventional scroll fluid machine.

FIG. 5 is an enlarged sectional view showing the vicinity of a conventional valve mechanism.

FIG. 6 is a sectional view of a valve mechanism for explaining a contact state between a spring and a valve receiver.

[Explanation of symbols]

 Reference Signs List 101 fixed scroll 101a base plate 101b spiral projection 102 swinging scroll 102a base plate 102b spiral projection 103 suction port 104 discharge port 105 compression chamber 106 main shaft 114 cylinder body 120 check valve 121 valve receiver 121a cylinder 121b valve Receiving surface 121c Guide part 122 Spring

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-80089 (JP, A) JP-A-1-63790 (JP, U) JP-A-55-12042 (JP, U)

Claims (1)

(57) [Claims] 1. A fixed scroll having a spiral projection provided on a lower surface of a base plate portion and a discharge port provided at the center of the base plate portion, and a spiral projection body provided on an upper surface of the base plate portion and combined with the fixed scroll. And a valve mechanism provided at the discharge port of the fixed scroll to prevent the working fluid from moving from the high pressure side to the low pressure side, and the valve mechanism prevents backflow of the working fluid. In a scroll compressor including a check valve, a biasing member formed of a coil spring that presses the check valve to close the discharge port, and a valve receiver that regulates movement of the check valve and the biasing member, The valve receiver has a conical cylindrical portion that gradually reduces in diameter and projects in the check valve direction, a valve receiving surface at the lower end of the cylindrical portion that regulates the amount of movement of the check valve when it is opened, and a check valve. With a guide part that regulates movement of the shaft only in the axial direction And the above coil
A biasing member made of a spring is fitted into the conical cylindrical portion of the valve receiver.
Scroll fluid machine, characterized in that the engagement.