Vacuum pump tail gas exhaust assisting device

Abstract

The utility model discloses a vacuum pump tail gas exhaust aiding device, which comprises a valve body, which is of a pipe body structure, the diameter of the middle pipe section of the valve body is larger than that of the end pipe section of the valve body, and the two ends of the valve body are respectively provided with a first interface and a second interface; a first connecting hole and a second connecting hole are formed in the valve body; the check valve is arranged in the middle pipe section of the valve body, and the check valve comprises a plug capable of moving back and forth in the axial direction of the valve body; and the connecting device is arranged on one side of the valve body, and the first connecting hole and the second connecting hole can be communicated through the connecting device. Electric energy consumption is reduced by compressing gas, the pressure of the exhaust end of the vacuum pump is reduced, the compression ratio burden of the last stage is reduced, the torsion of the dry pump is reduced, then the electric power loss of the vacuum pump is reduced, the tail gas emission efficiency is relatively improved, and tail gas emission is promoted; according to the device, compressed air is used for driving tail gas to be exhausted, and in the frequent frequency reducing and frequency increasing process of the vacuum pump, the pump lowering power of the vacuum pump can be reduced, and the partial buffering effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum pumps, in particular to an exhaust assisting device for a vacuum pump tail gas. Background Art

[0002] A vacuum pump, also known as a dry pump, primarily relies on electricity to drive a motor that drives the impeller at high speed, squeezing out the air inside the pump body and creating negative pressure. During operation, the vacuum pump typically achieves negative pressure for 30% to 50% of the time, while the remaining time is spent maintaining a constant negative pressure. The motor output is far lower than the power required to create the vacuum. Existing vacuum pumps experience high torque, significant power loss, and relatively low exhaust emission efficiency during operation. Therefore, a vacuum pump exhaust assist device has been designed to address these issues.

[0003] It should be noted that the above technical background is merely for the purpose of providing a clear and complete description of the technical solutions of the present invention and to facilitate understanding by those skilled in the art. It should not be assumed that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present invention. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a vacuum pump exhaust assisting device.

[0005] In order to achieve the above purpose and other related purposes, the technical solution provided by the present invention is: a vacuum pump exhaust auxiliary device connected to the exhaust tail end of the vacuum pump, comprising:

[0006] The valve body is a tubular structure, wherein the diameter of the middle section of the valve body is larger than the diameter of the end sections thereof, and a first interface and a second interface are respectively provided at both ends of the valve body; and a first connecting hole and a second connecting hole are opened on the valve body;

[0007] a check valve, the check valve being arranged inside the middle pipe section of the valve body, the check valve comprising a plug that can move back and forth along the axial direction of the valve body;

[0008] A connecting device is provided on one side of the valve body, and the first connecting hole and the second connecting hole can be connected through the connecting device.

[0009] Furthermore, the maximum diameter of the plug is larger than the end diameter of the valve body; when the plug is moved toward the second port to a restricted position, the interior of the valve body is divided into a first chamber and a second chamber, through which gas cannot flow directly through the inner cavity of the valve body; the first chamber is connected to the first port, and the second chamber is connected to the second port. In this embodiment, when the plug is moved to the restricted position (the end pipe section), it blocks gas flow between the first and second chambers through the inner cavity of the valve body, thereby allowing gas in the second chamber to flow into the first chamber through the connecting device and then be discharged from the first port.

[0010] Furthermore, the check valve further includes a fixed disk and a circular tube. The fixed disk is fixedly mounted on the inner cavity wall of the valve body. One end of the circular tube is inserted through the middle of the fixed disk, and the other end of the circular tube is fixedly connected to the plug and moves synchronously therewith. In this embodiment, the circular tube is fixedly connected to the plug. When the plug moves axially along the valve body, the circular tube moves axially synchronously with the plug. Since the fixed disk is fixed to the inner cavity wall of the valve body, one end of the circular tube moves back and forth in the middle of the fixed disk during movement, thereby acting as a limit.

[0011] Furthermore, a compression spring is provided on the circular tube, and is located between the fixed disk and the plug. In this embodiment, when the air pressure in the first chamber is lower than the air pressure in the second chamber, the plug moves axially to press the compression spring, causing the compression spring to be compressed. When the air pressure in the first chamber is higher than or equal to the air pressure in the second chamber, the compression spring expands and returns to rest against the plug.

[0012] Furthermore, the center line of the fixed plate and the center line of the circular tube are both arranged to coincide with the center line of the valve body. In this solution, the coincidence of the three center lines improves the stability of the structure and the smoothness of the movement.

[0013] Furthermore, the first connecting hole and the second connecting hole are respectively located on either side of the plug in the axial direction. In this embodiment, the first connecting hole is located below the fixed plate, and the second connecting hole is located below the plug. When the plug separates the inner cavity of the valve body, the first connecting hole and the second connecting hole respectively connect the first chamber and the second chamber.

[0014] Furthermore, the fixed plate is provided with through holes; a plurality of through holes are provided, and the through holes cover the fixed plate at a rate of 60% to 90%. In this embodiment, the through holes are provided on the fixed plate and the coverage rate is guaranteed, ensuring that the gas can flow through the fixed plate quickly before being discharged, thereby improving the exhaust gas discharge efficiency.

[0015] Furthermore, the plug is a disc-shaped structure, and is provided with a sealing ring. In this embodiment, the outer end of the plug, which is closer to the second interface, has a smaller diameter than the inner end, and the sealing ring is fitted over the outer end. The provision of the sealing ring on the plug improves the sealing performance of the plug.

[0016] Furthermore, the connection device includes a vacuum generator, which includes an air supply port, an exhaust port, and a vacuum port. The exhaust port is connected to the first connection hole, and the vacuum port is connected to the second connection hole. In this embodiment, the vacuum port and the second connection hole are connected by a curved pipe, one end of which is inserted into the second connection hole and remains sealed; the exhaust port is attached to the first connection hole and remains sealed. When the vacuum generator is closed, the first connection hole and the second connection hole are not connected, the vacuum pump is connected to the valve body through the second interface, and the exhaust gas passes through the inner cavity of the valve body and is exhausted through the first interface. When the vacuum generator is opened, air is taken in through the air supply port, and the vacuum port draws air from the second connection hole, causing the second chamber to be in a negative pressure state. The exhaust port exhausts air into the first connection hole, causing the first chamber to be in a positive pressure state. At this time, the inner cavity of the valve body is blocked by the plug, and the exhaust gas enters the first chamber through the vacuum generator and is then exhausted through the first interface.

[0017] Furthermore, a housing is provided on the exterior of the middle pipe section of the valve body; the housing comprises a first protective cover and a second protective cover, the first and second protective covers being detachably connected. In this solution, the housing provided on the exterior of the valve body can provide protection and extend the service life of the device.

[0018] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] The vacuum pump exhaust assist device designed by the utility model reduces the consumption of electric energy by using more economical compressed gas. The pressure at the exhaust end of the vacuum pump will be reduced, and the burden of the compression ratio of the last stage will also be reduced accordingly. The torque of the dry pump will be reduced, thereby reducing the loss of electric power of the vacuum pump, and the exhaust emission efficiency will be relatively improved, thereby promoting the emission of exhaust gas. The device uses compressed air to drive the exhaust emission, which helps to reduce the power of the vacuum pump during the frequent frequency reduction and increase of the vacuum pump, and plays a partial buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the exhaust gas exhaust device of the present utility model;

[0021] Figure 2 This is a schematic diagram of the valve body and related structures of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the valve body of the present utility model;

[0023] Figure 4 This is a schematic diagram of the check valve structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the check valve structure of the utility model;

[0025] In the above drawings, 1. valve body; 101. first interface; 102. second interface; 103. first connecting hole; 104. second connecting hole; 2. check valve; 201. plug; 202. fixing plate; 203. round tube; 204. through hole; 205. sealing ring; 3. connecting device; 301. air supply port; 302. exhaust port; 303. vacuum port; 304. vacuum generator; 4. first chamber; 5. second chamber; 6. outer shell; 7. elbow. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the utility model product is usually placed when in use. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0031] Example:

[0032] See attached Figure 2 and attached Figure 3 As shown, this embodiment provides a vacuum pump exhaust assisting device, which is connected to the exhaust tail end of the vacuum pump and includes:

[0033] The valve body 1 is a tubular structure. The diameter of the middle pipe section of the valve body 1 is larger than the diameter of the end pipe section. The two ends of the valve body 1 are respectively provided with a first interface 101 and a second interface 102; the valve body 1 is provided with a first connecting hole 103 and a second connecting hole 104; wherein, the first interface 101 and the second interface 102 can be provided with flanges for easy connection.

[0034] The check valve 2 is arranged inside the middle pipe section of the valve body 1 and includes a plug 201 that can move back and forth along the axial direction of the valve body 1;

[0035] The connecting device 3 is provided on one side of the valve body 1 , and the first connecting hole 103 and the second connecting hole 104 can be connected through the connecting device 3 .

[0036] See attached Figure 3 and attached Figure 4As shown, the maximum diameter of the plug 201 is larger than the end diameter of the valve body 1. When the plug 201 moves toward the second port 102 to a restricted position, the interior of the valve body 1 is divided into a first chamber 4 and a second chamber 5, through which gas cannot flow directly through the inner cavity of the valve body 1. The first chamber 4 is connected to the first port 101, and the second chamber 5 is connected to the second port 102. In this embodiment, when the plug 201 moves to the restricted position (the end pipe section), it blocks the flow of gas between the first chamber 4 and the second chamber 5 through the inner cavity of the valve body 1. As a result, gas in the second chamber 5 can flow into the first chamber 4 through the connecting device 3 and then be discharged from the first port 101. In addition, the check valve 2 also includes a fixed disk 202 and a circular tube 203. The fixed disk 202 is fixedly mounted on the inner cavity wall of the valve body 1. One end of the circular tube 203 penetrates the middle of the fixed disk 202, and the other end of the circular tube 203 is fixedly connected to the plug 201 and moves synchronously with it. In this embodiment, the circular tube 203 is fixedly connected to the plug 201. When the plug 201 moves axially along the valve body 1, the circular tube 203 moves axially synchronously with the plug 201. Since the fixed disk 202 is fixed to the inner wall of the valve body 1, when the circular tube 203 moves, one end thereof moves back and forth in the middle of the fixed disk 202, which can play a limiting role.

[0037] In some embodiments, a compression spring is provided on the circular tube 203 and is located between the fixed disk 202 and the plug 201. In this embodiment, when the air pressure in the first chamber 4 is lower than the air pressure in the second chamber 5, the plug 201 moves axially to squeeze the compression spring, causing the compression spring to be compressed. When the air pressure in the first chamber 4 is higher than or equal to the air pressure in the second chamber 5, the compression spring expands and returns to rest against the plug 201.

[0038] See attached Figure 3 As shown, the center line of the fixed plate 202 and the center line of the circular tube 203 are both arranged to coincide with the center line of the valve body 1. In this embodiment, the coincidence of the three center lines improves the stability of the structure and the smoothness of the movement.

[0039] See attached Figure 3 As shown, the first connecting hole 103 and the second connecting hole 104 are respectively located on either side of the axial direction of the plug 201. In this embodiment, the first connecting hole 103 is located below the fixed plate 202, and the second connecting hole 104 is located below the plug 201. When the plug 201 separates the inner cavity of the valve body 1, the first connecting hole 103 and the second connecting hole 104 respectively communicate with the first chamber 4 and the second chamber 5.

[0040] See attached Figure 4As shown, the fixed disk 202 is provided with through holes 204; a plurality of through holes 204 are provided, and the coverage of the fixed disk 202 by the through holes 204 is 60% to 90%. In this embodiment, the through holes 204 are provided on the fixed disk 202 and the coverage is guaranteed, ensuring that the gas can flow through the fixed disk 202 quickly before being discharged, thereby improving the exhaust gas discharge efficiency.

[0041] See attached Figure 3 and attached Figure 4 As shown, in some embodiments, plug 201 is a disc-shaped structure, and a sealing ring 205 is provided on plug 201. The outer end of plug 201, near second interface 102, has a smaller diameter than the inner end, and sealing ring 205 is sleeved on the outer end. The provision of sealing ring 205 on plug 201 improves the sealing performance of plug 201.

[0042] See attached Figure 5 As shown, the connection device 3 includes a vacuum generator 304, which includes an air supply port 301, an exhaust port 302, and a vacuum port 303. The exhaust port 302 is connected to the first connection hole 103, and the vacuum port 303 is connected to the second connection hole 104. In this embodiment, the vacuum port 303 and the second connection hole 104 are connected by an elbow 7, one end of which is inserted into the second connection hole 104 and maintains a seal. The exhaust port 302 is located adjacent to the first connection hole 103 to maintain a seal.

[0043] In some embodiments, the exhaust port 302 is provided with a circular tube, and the circular tube is integrally provided with the body of the vacuum generator 304 .

[0044] When the vacuum generator 304 is closed, the first connecting hole 103 and the second connecting hole 104 are disconnected, the vacuum pump is connected to the valve body 1 through the second interface 102, and the exhaust gas passes through the inner cavity of the valve body 1 and is exhausted through the first interface 101;

[0045] When the vacuum generator 304 is turned on, air is taken in by the air supply port 301, and the vacuum port 303 draws air from the second connecting hole 104, so that the second chamber 5 is in a negative pressure state, and the exhaust port 302 exhausts air into the first connecting hole 103, so that the first chamber 4 is in a positive pressure state. At this time, the inner cavity of the valve body 1 is blocked by the plug 201, and the exhaust gas enters the first chamber 4 from the first chamber 4 through the vacuum generator 304 and is then discharged through the first interface 101.

[0046] In some embodiments, the vacuum generator 304 is a pneumatic CV negative pressure vacuum generator 304 .

[0047] Because the motor speed and impeller size have upper limits, the vacuum level of each pump body also has an upper limit. If a higher vacuum level is required, it can only be achieved by using multiple stages in series. The vacuum pressure compression ratio of a multi-stage vacuum pump has a significant impact on the power consumption. By increasing the pressure of one stage, the pressure of the previous stage is reduced. This reduced pressure reduces power consumption and the operating power of the main pump. The vacuum pump exhaust assist device, equivalent to a small dry pump, can maintain the vacuum level of the vacuum pump's final stage. This reduces power consumption by using more economical and more compressed gas. The exhaust pressure of the vacuum pump is reduced, and the burden on the compression ratio of the final stage is also reduced. The dry pump torque is reduced, which in turn reduces the vacuum pump's power loss and relatively improves exhaust efficiency.

[0048] See attached Figure 1 As shown, in some embodiments, a housing 6 is disposed on the exterior of the middle pipe section of the valve body 1. The housing 6 comprises a first protective cover and a second protective cover, which are detachably connected. The housing 6 provides protection for the valve body 1 and extends the service life of the device.

[0049] The vacuum pump exhaust assist device designed by the utility model reduces the consumption of electric energy by using more economical compressed gas. The pressure at the exhaust end of the vacuum pump will be reduced, and the burden of the compression ratio of the last stage will also be reduced accordingly. The torque of the dry pump will be reduced, thereby reducing the loss of electric power of the vacuum pump, and the exhaust emission efficiency will be relatively improved, thereby promoting the emission of exhaust gas. The device uses compressed air to drive the exhaust emission, which helps to reduce the power of the vacuum pump during the frequent frequency reduction and increase of the vacuum pump, and plays a partial buffering role.

[0050] The above implementation methods are only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A vacuum pump exhaust assist device, connected to the exhaust tail end of the vacuum pump, characterized in that: include: A valve body (1), wherein the valve body (1) is a tubular structure, the diameter of the middle section of the valve body (1) is larger than the diameter of the end sections thereof, and a first interface (101) and a second interface (102) are respectively provided at both ends of the valve body (1); a first connecting hole (103) and a second connecting hole (104) are provided on the valve body (1); A check valve (2), the check valve (2) being arranged inside a middle pipe section of the valve body (1), the check valve (2) comprising a plug (201) that can move back and forth along the axial direction of the valve body (1); A connecting device (3) is provided on one side of the valve body (1), and the first connecting hole (103) and the second connecting hole (104) can be connected via the connecting device (3).

2. The vacuum pump exhaust assist device according to claim 1, characterized in that: The maximum diameter of the plug (201) is larger than the end diameter of the valve body (1); when the plug (201) moves to a restricted position in the direction of the second interface (102), the interior of the valve body (1) is divided into a first chamber (4) and a second chamber (5), through which gas cannot directly flow through the inner cavity of the valve body (1); the first chamber (4) is connected to the first interface (101), and the second chamber (5) is connected to the second interface (102).

3. The vacuum pump exhaust assist device according to claim 1, characterized in that: The check valve (2) further comprises a fixed disk (202) and a circular tube (203), wherein the fixed disk (202) is fixedly arranged on the inner cavity wall of the valve body (1), one end of the circular tube (203) is passed through the middle of the fixed disk (202), and the other end of the circular tube (203) is fixedly connected to the plug (201) and moves synchronously therewith.

4. The vacuum pump exhaust assist device according to claim 3, characterized in that: A compression spring is provided on the circular tube (203), and the compression spring is located between the fixed disk (202) and the plug (201).

5. The vacuum pump exhaust assist device according to claim 3, characterized in that: The center line of the fixed disk (202) and the center line of the circular tube (203) are both arranged to coincide with the center line of the valve body (1).

6. The vacuum pump exhaust assist device according to claim 1, characterized in that: The first connecting hole (103) and the second connecting hole (104) are respectively located on two axial sides of the plug (201).

7. The vacuum pump exhaust assist device according to claim 3, characterized in that: The fixed disk (202) is provided with a through hole (204); a plurality of the through holes (204) are provided, and the coverage rate of the through holes (204) on the fixed disk (202) is 60% to 90%.

8. The vacuum pump exhaust assist device according to claim 1, characterized in that: The plug (201) is a disc-shaped structure, and a sealing ring (205) is provided on the plug (201).

9. The vacuum pump exhaust assist device according to claim 1, characterized in that: The connecting device (3) comprises a vacuum generator (304), the vacuum generator (304) comprising an air supply port (301), an exhaust port (302) and a vacuum port (303), the exhaust port (302) being connected to the first connecting hole (103), and the vacuum port (303) being connected to the second connecting hole (104).

10. The vacuum pump exhaust assist device according to claim 1, characterized in that: An outer shell (6) is provided on the outside of the middle pipe section of the valve body (1); the outer shell (6) is composed of a first protective cover and a second protective cover, and the first protective cover and the second protective cover are detachably connected.

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