JPH08312561A - Scroll type vacuum pump - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a scroll-type vacuum pump in which noise is reduced. [Structure] In a scroll type vacuum pump in which a spiral scroll wrap 1a, 1b of an orbiting scroll 1 and a spiral scroll wrap 2a, 3a of a fixed scroll 2, 3 are fitted to form a compression space, a discharge port 19 is provided. A shielding cover 21 is provided which serves as a barrier that prevents direct propagation of the sound of air discharge and the operation sound of the check valve 16 for preventing backflow of air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air outlet of a scroll type vacuum pump.

[0002]

2. Description of the Related Art A conventional scroll type vacuum pump has an air outlet with a rubber plate for preventing backflow of exhaust air.
A leaf spring was provided to press the rubber plate against the discharge port. Also, a valve that moves in the air discharge direction is pressed against the air discharge port by a coil spring.

[0003]

In the conventional scroll type vacuum pump, when the air discharge port is only the rubber plate seal or the valve seal, the sound of the air discharged from the discharge port or the operation noise of the rubber plate or the valve is generated. Was heard as noise from the outside because there was nothing that blocked the propagation of sound to the outside of the vacuum pump.

It is an object of the present invention to provide a scroll type vacuum pump which reduces noise.

[0005]

[Means for Solving the Problems] The above object is to provide a barrier in the sound propagating direction so that the air discharge sound generated at the air outlet and the operation sound of the rubber plate or the valve do not propagate directly to the outside of the vacuum pump. It is achieved by providing.

[0006]

The scroll type vacuum pump constructed as described above operates so as to obtain an operation with less noise.

[0007]

1 shows an embodiment of a scroll type vacuum pump according to the present invention. In FIG. 1, spiral scroll wraps 1a and 1b are erected from both sides of the end plate of the orbiting scroll 1. The fixed scrolls 2 and 3 are the housing 4 and
5, the spiral scroll wraps 2a and 3a are respectively erected from one side of the end plates of the fixed scrolls 2 and 3 so as to fit into the spiral scroll wraps 1a and 1b of the orbiting scroll to form a compression space 17. are doing. Spiral scroll wraps 2a, 3a of fixed scrolls 2, 3
An O-ring 6 is provided between the housings 4 and 5 on the outer side in the radial direction, and the orbiting scroll 1 is housed in the housings 4 and 5. Furthermore, spiral scroll wraps 1a, 1b, 2
A crank pin 7 is disposed via bearings 8 and 9 so that the orbiting scroll 1 does not rotate but revolves radially inward of a and 3a. Orbiting scroll 1 and fixed scroll 2,
Inside the crank pin 7 between the three in the radial direction, the sliding bodies 10, 1
Interpose 1. The axial position of the orbiting scroll 1 is controlled by the sliding bodies 10 and 11, and the orbiting scroll 1 is movably engaged with a main crankshaft 13 via a bearing 12. The main crankshaft 13 is axially supported by the housings 4 and 5 via bearings 14 and 15, and one end thereof is connected to an electric motor (not shown). When the electric motor is operated, the orbiting scroll 1 starts an eccentric motion with the rotation of the main crankshaft 13,
The fluid sucked from the suction port 18 is compressed in the compression space 17 and discharged from the discharge port 19 provided with the check valve 16. A cover 21 that covers the outlet 19 and serves as a barrier to the sound source is discharged from a slit 21 provided between the cover 20 and the housing 4.

FIG. 2 shows another embodiment of the scroll type vacuum pump according to the present invention. In FIG. 2, the housing, scroll, bearing and the like are the same as those in the above embodiment,
It is connected to the electric motor. When the electric motor is operated, the orbiting scroll 1 is accompanied by the rotation of the main crankshaft 13.
Starts eccentric movement, the fluid sucked from the suction port 18 is compressed in the compression space 17, and the discharge port 19 provided with the check valve 16 is provided.
Emitted from. The shielding cover 22 that covers the outlet 19 and serves as a barrier against the sound source is discharged from an exhaust pipe 23 having the same diameter as the outlet provided in the rear cover 22.

[0009]

According to the present invention, the noise generated from the scroll type vacuum pump can be reduced by providing a shield cover as a barrier at the compressed air discharge port.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a scroll type vacuum pump according to the present invention.

FIG. 2 is a vertical sectional side view showing another embodiment of the scroll vacuum pump according to the present invention.

DESCRIPTION OF SYMBOLS 1 is an orbiting scroll, 1a is an orbiting scroll spiral scroll wrap, 1b is an orbiting scroll spiral scroll wrap, 2 is a fixed scroll, 3 is a fixed scroll, 2a is a fixed scroll spiral scroll wrap,
3a is a spiral scroll wrap of a fixed scroll, 4 is a housing, 5 is a housing, 6 is an O ring, 7 is a crank pin, 8 is a bearing, 9 is a bearing, 12 is a bearing, 14 is a bearing, 15 is a bearing, and 10 is a bearing. Sliding body, 11 sliding body, 13 main crankshaft, 16 check valve, 17 compression space,
18 is an inlet, 19 is an outlet, 20 is a cover, 22
Is a shielding cover, 21 is a slit, and 23 is a discharge pipe.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Mitsuo Ogura 1060 Takeda, Hitachinaka City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (3)

[Claims] 1. A spiral scroll wrap is provided so as to stand upright from an end plate of an orbiting scroll, and a spiral scroll wrap is provided so as to stand upright from an end plate of a fixed scroll, and the orbiting scroll and the fixed scroll The orbiting scroll is connected to the electric motor by the main crankshaft, and the orbiting scroll is eccentrically moved by the operation of the electric motor to suck air from the suction port. In a scroll-type vacuum pump that discharges air into the atmosphere from a discharge port, the discharge port is provided with a barrier that prevents direct propagation of air discharge noise and operation noise of a check valve that prevents backflow of air. Scroll type vacuum pump. 2. The barrier is formed by providing a space by the barrier at the discharge port provided with the check valve, and by providing a discharge port from the space by the barrier in a direction different from an air discharge direction of the discharge port. The scroll type vacuum pump according to claim 1, wherein 3. A pipe having a cross-sectional area larger than the cross-sectional area of the discharge port is connected to the air discharge port, and a pipe having the same cross-sectional area as the cross-sectional area of the discharge port is bent at 45 ° or more with respect to the discharge of air. The scroll type vacuum pump according to claim 1, wherein the barrier is formed by connecting and discharging air into the atmosphere.