KR101684549B1

KR101684549B1 - Rotary vacuum pump

Info

Publication number: KR101684549B1
Application number: KR1020150096269A
Authority: KR
Inventors: 권희도; 서인재; 송계웅
Original assignee: 현대자동차 주식회사; 기아자동차 주식회사
Priority date: 2015-07-07
Filing date: 2015-07-07
Publication date: 2016-12-08

Abstract

The present invention relates to a rotary vacuum pump capable of improving durability and reducing production costs. The rotary vacuum pump includes: a pump housing including a pump room formed in a cylindrical shape; a rotor mounted on the pump room to rotate in order for the center to be eccentric from the center of the pump room, wherein the rotor rotates by a rotation shaft; a vane compressing gas flowing into the pump room by being mounted on the rotor; and a single discharge valve discharging the gas to the outside of the pump housing when the compressed gas exceeds a predetermined pressure. The pump housing has an inner flow path in order for the compressed gas to flow from one side of the pump room to the other side of the pump room. A check valve limiting only a one-way flow is mounted on the inner flow path.

Description

Rotary vacuum pump {ROTARY VACUUM PUMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary vacuum pump, and more particularly, to a rotary vacuum pump capable of providing a sufficient space in a package space, reducing cost, and improving durability.

Generally, vacuum pumps are collectively referred to as machines used to create vacuum by removing gas in the vessel.

The rotary vacuum pump sucks the gas (and oil) by rotating the rotating body in the pump room, compresses the sucked gas (and oil) by the vane, and discharges the compressed gas (and oil) Decrease the pressure in the container connected to the gas suction unit or make a vacuum.

At this time, the oil is generally sucked together with the gas for lubrication and hermeticity in the rotary vacuum pump.

The rotating body generally comprises a rotor and a plurality of vanes. The rotor is generally arranged eccentrically to the center of the pump room and connected to the crankshaft of the vehicle or connected to the rotational axis of the electric motor and rotates.

Due to the eccentricity of the rotor and the change in the size of the space formed between the vanes, the sucked gas can be compressed and discharged through the discharge valve.

However, in an emergency, the rotor and the vanes may rotate in opposite directions. In this case, the gas is compressed due to the rotation in the opposite direction, but the compressed gas can not be discharged through the discharge valve provided for the normal compression state. This is because the position of the space where the gas is compressed varies within the pump room.

In order to prepare for such an abnormal condition, it is common that a reverse discharge valve is provided separately at the position in order to appropriately discharge the gas (and the oil) compressed by the vane's reverse rotation. If the gas (and oil) compressed by reverse rotation of the vane is not properly discharged, the vane is broken by the high pressure, so that the vacuum pump can not function.

Therefore, according to the prior art, two discharge valves are provided at different positions in the pump room, which causes the following problems.

First, the size of the vacuum pump is increased due to the reverse discharge valve, and the package space is narrowed.

Second, costs increase due to increased acceptance of gas and oil emissions and processing.

Third, due to the space occupied by the reverse discharge valve, the size of the rotor is restricted, thereby deteriorating the durability of the rotor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary vacuum pump for solving the problems described above, which is capable of securing sufficient package space, reducing cost, and improving durability.

In one or more embodiments of the present invention, there is provided a rotary vacuum pump comprising: a pump housing including a cylindrical pump chamber; a pump housing rotatably mounted in the pump chamber such that the center of the pump housing is eccentric with the center of the pump chamber; A vane that is mounted on the rotor and compresses the gas introduced into the pump room and a single discharge valve that discharges the gas to the outside of the pump housing when the compressed gas exceeds a predetermined pressure, Wherein an inner flow passage is formed in the pump housing such that the compressed gas flows from one side of the pump room to the other side of the pump room and a check valve is provided in the inner flow passage for allowing only unidirectional flow A rotary vacuum pump can be provided.

Wherein the outer circumferential surface of the rotor meets a single point on the inner circumferential surface of the pump housing and the inner flow passage has an inlet on one side of the inner circumferential surface of the pump housing and an outlet on the other side of the inner circumferential surface of the pump housing, .

The check valve may be a first leaf spring mounted to the inlet or the outlet to open only in one direction when the predetermined pressure is exceeded.

The pump housing includes an outer wall in the form of a hollow cylinder and a plate portion forming an axial one end wall of the outer wall, and the inner flow passage may be formed in the outer wall.

The discharge valve may include a through hole formed in the plate portion, and a second leaf spring which is opened only in the discharge direction when the pressure exceeds a predetermined pressure mounted on the through hole.

The outlet of the internal flow passage may be formed on the discharge valve side with respect to a straight line passing through the center of the single point and the rotor.

The vane may be slidably mounted on the rotor and rotated by the rotor to operate while contacting the inner circumferential surface of the pump housing.

The vane may include a single body mounted across the rotor and sliding portions mounted on both ends of the body so as to contact the inner circumferential surface of the pump housing when the vane is rotated.

As described above, the rotary vacuum pump according to the present invention can provide a sufficient space for the package space, cost reduction, and durability while preventing the vane from rotating in the reverse direction.

1 is a perspective view of a rotary vacuum pump according to an embodiment of the present invention.
2 is an enlarged perspective view of a main part of a rotary vacuum pump according to an embodiment of the present invention.
3 is a rear perspective view of a rotary vacuum pump according to an embodiment of the present invention.
4 is a rear perspective view of a conventional rotary vacuum pump.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention, and are not intended to limit the scope of the inventions. I will do it.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the name of a component does not limit the functionality of that component.

1 is a perspective view of a rotary vacuum pump according to an embodiment of the present invention.

2 is an enlarged perspective view of a main part of a rotary vacuum pump according to an embodiment of the present invention.

3 is a rear perspective view of a rotary vacuum pump according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a rotary vacuum pump according to an embodiment of the present invention includes a pump housing 10 including a cylindrical pump chamber 5, A rotor 20 rotatably mounted on the pump room 5 so as to be eccentric and rotated by a rotating shaft, a vane 30 mounted on the rotor 20 and compressing a gas introduced into the pump room 5, , And a single discharge valve (40) for discharging the gas to the outside of the pump housing (10) when the compressed gas exceeds a predetermined pressure.

An internal flow passage 50 may be formed in the pump housing 10 so that the compressed gas flows from one side of the pump room 5 to the other side of the pump room 5, ) May be equipped with a check valve which allows only one directional flow.

The check valve may be a first leaf spring 51 mounted to the inlet 50a or the outlet 50b so as to open only in one direction when the predetermined pressure is exceeded. Accordingly, when the compressed gas is in an abnormal state and the compressed gas exceeds a predetermined pressure, the first leaf spring 51 is opened to allow the gas to flow through the internal flow passage 50, thereby relieving the high pressure.

The pump room 5 refers to the inner space of the rotary vacuum pump and is defined by the pump housing 10 and the front cover (not shown) and is closed against the outside. In the rotary vacuum pump of Figures 1 and 2, the front cover is omitted to effectively illustrate the pump room and other components.

The rotor 20 may be connected to a crankshaft of an automobile or may be connected to a rotating shaft of an electric motor to rotate.

The vane 30 may generally be composed of a plurality of vanes, but the same function may be implemented with a single vane as in the embodiment of Figs. 1 and 2.

In the rotary vacuum pump shown in Fig. 1, the rotor and the vane rotate in a counterclockwise direction in a normal state, and the rotor and the vane rotate in a clockwise direction in an abnormal state.

The rotary vacuum pump does not require two discharge valves, unlike the prior art, and can prepare for the case where the vane 30 is reversely rotated by only one of the discharge valves 40. This is because the gas in one side of the inside of the pump room 5 can be moved to the other side in the pump room 5 by the internal flow passage 50 so that the high pressure due to the reverse rotation can be eliminated. However, since the check valve is installed, the compressed gas can not flow through the internal flow passage 50 when the vane 30 rotates in the counterclockwise direction, .

The outer circumferential surface of the rotor 20 meets a single point P of the inner circumferential surface 12 of the pump housing 10 and the inner fluid passage 50 is located at a side of the inner circumferential surface 12 of the pump housing 10 And has an outlet 50b on the other side of the inlet 50a and the single point P can be disposed between the inlet 50a and the outlet 50b.

The single point P may be a straight line in the depth direction of FIG. 1 because the inner circumferential surface 12 and the rotor 20 are both cylindrical. In general, the rotary vacuum pump is configured such that the outer circumferential surface of the rotor 20 and the inner circumferential surface 12 of the pump housing 10 meet, and the mounting tolerance of the rotor at the single point P, The airtightness can be maintained when the gas is compressed by the rotation of the gas.

Therefore, when the vane 30 rotates clockwise in an abnormal state, the gas of the space C compressed by the high pressure flows into the space B through the internal flow passage 50. [ Subsequently, when the vane 30 rotates clockwise, the space B expands and the space A compresses. When the gas in the space A is compressed and becomes the space C, the gas in the space C flows back to the space B through the internal flow passage 50 again. Thereby, even when the vane 30 reversely rotates in the emergency state, the high pressure can be eliminated without the addition of the discharge valve, and breakage of the vane and failure of the vacuum pump are prevented.

1 to 3, the pump housing 10 includes an outer wall 2 having a hollow cylinder shape and a plate portion 3 forming a wall at one end in the axial direction of the outer wall 2 , The inner flow passage (50) may be formed in the outer wall (2). However, the embodiment is not limited to this, and may be formed in the front cover of the pump housing 10 or the plate portion 3 as long as the high pressure can be removed by the internal flow passage 50.

1 and 3, the discharge valve 40 includes a through hole 7 formed in the plate portion 3, and a through hole 7 formed in the through hole 7, And a second leaf spring 8 which is opened only by the second leaf spring 8.

1 and 2, the outlet 50b of the internal flow passage 50 is connected to the discharge valve 40 on the basis of a straight line passing through the center of the single point P and the rotor 20, As shown in Fig. This is because when the gas compressed into the C space by the rotation of the vane 30 has a predetermined pressure, the first leaf spring 51 is opened to flow into the B space through the internal flow passage 50 . The pressure at which the first leaf spring 51 is opened can be set by adjusting the area of the first leaf spring 51 and the spring constant.

The vane 30 can be slidably mounted on the rotor 20 and rotated by the rotor 20 to operate while contacting the inner circumferential surface 12 of the pump housing 10.

To this end, the vane 30 includes a single body portion 32 mounted across the rotor 20 and a plurality of vanes 30 which are in contact with the inner peripheral surface 12 of the pump housing 10 during rotation of the vane 30. [ And sliding portions 34 mounted on both ends of the body portion 32. [

When the rotor 20 rotates, the sliding portions 34 can be rotated while being in contact with the inner peripheral surface 12 by being radially extended by the centrifugal force. Accordingly, when the vane 30 rotates counterclockwise, the space A is compressed and the space B is expanded, so that the gas sucked into the pump room 5 is periodically compressed and discharged to the discharge valve 40, The gas can be sucked into the pump room 5 through the gas suction unit 14 periodically. The operation principle of a general rotary vacuum pump is well known to those skilled in the art, so that detailed description is omitted.

4 is a rear perspective view of a conventional rotary vacuum pump.

3 and 4, the rotary vacuum pump according to the embodiment of the present invention is configured such that the conventional rotary vacuum pump discharges the compressed gas in a steady state to the first discharge valve by using two discharge valves, As a discharge valve, unlike the case where the vane 30 discharges the compressed gas during the reverse rotation in an abnormal state, a single discharge valve 40 can perform a conventional function.

That is, by allowing the first discharge valve of Fig. 4 to be eliminated, the following effects are obtained.

First, the size of the vacuum pump is reduced and the receiving space of the gas and the oil can be removed, thereby ensuring sufficient package space.

Second, the costs are reduced due to the removal of the receiving parts of the discharged gas and oil and the reduction of the machining operation.

Third, the size of the rotor can be increased, thereby improving the durability of the rotor and the vacuum pump.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

5: Pump room 10: Pump housing
20: rotor 30: vane
40: exhaust valve 50: internal flow passage
51: first leaf spring

Claims

In the rotary vacuum pump,
A pump housing including a pump chamber formed in a cylindrical shape;
A rotor rotatably mounted on the pump room such that a center thereof is eccentric with a center of the pump room, the rotor being rotated by a rotation axis;
A vane mounted on the rotor for compressing gas introduced into the pump room; And
A single discharge valve adapted to discharge gas out of the pump housing when the compressed gas exceeds a predetermined pressure;
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Wherein the pump room is divided into a plurality of compression expansion spaces by the rotor and the vane,
The pump housing is provided with an internal flow passage continuously formed such that the compressed gas flows from one compression expansion space of the pump room to the other compression expansion space of the pump room and the internal flow passage is provided with a check And a valve is mounted on the rotary pump.

The method according to claim 1,
The outer circumferential surface of the rotor meets a single point on the inner circumferential surface of the pump housing,
Wherein the inner flow passage has an inlet on one side of the inner circumferential surface of the pump housing and an outlet on the other side,
Wherein the single point is disposed between the inlet and the outlet.

3. The method of claim 2,
The check valve
And a first leaf spring mounted to the inlet or the outlet so as to be opened only in one direction when the predetermined pressure is exceeded.

The method according to claim 1,
The pump housing includes:
An outer wall in the form of a hollow cylinder, and a plate portion forming a wall at one end in the axial direction of the outer wall,
And the inner flow passage is formed on the outer wall.

5. The method of claim 4,
Wherein the discharge valve comprises:
A through hole formed in the plate portion; And
A second leaf spring mounted on the through hole and opened only in an outer direction of the pump housing when a predetermined pressure is exceeded;
Wherein the vacuum pump is a vacuum pump.

3. The method of claim 2,
Wherein the outlet of the internal flow passage comprises:
Wherein the discharge port is formed on the discharge valve side with respect to a straight line passing through the center of the single point and the rotor.

The method according to claim 1,
The vane
Wherein the pump is slidably mounted on the rotor and rotated by the rotor to operate while contacting the inner circumferential surface of the pump housing.

8. The method of claim 7,
The vane
A single body mounted across the rotor; And
Sliding portions mounted on both ends of the body portion so as to contact the inner circumferential surface of the pump housing when the vane is rotated;
Wherein the vacuum pump is a vacuum pump.