Vacuum pump tail gas exhaust assisting device

Abstract

The invention discloses a vacuum pump tail gas exhaust assisting device which comprises a valve body 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 provided with a first connector and a second connector respectively; 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. The 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 exhaust emission efficiency is relatively improved, and exhaust 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 invention belongs to the technical field of vacuum pumps, and in particular relates to an exhaust assisting device for a vacuum pump. Background Art

[0002] The vacuum pump, also called a dry pump, mainly relies on the electric energy to drive the motor to drive the impeller to move at high speed, so as to squeeze out the air inside the pump body, thereby achieving the function of negative pressure. When the vacuum pump is working, the vacuum extraction time to achieve negative pressure is generally within 30%~50%, and the remaining time is spent on maintaining the constant negative pressure. The motor output is much lower than the power of vacuuming. During the operation of the existing vacuum pump, the vacuum pump has high torque, large power loss, and relatively low exhaust emission efficiency; therefore, a vacuum pump exhaust exhaust assist device is designed to solve the above problems.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies in the prior art, an object 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: A valve body, wherein the valve body is a pipe body structure, the diameter of the middle pipe section of the valve body is larger than the diameter of the end pipe section thereof, and the two ends of the valve body are respectively provided with a first interface and a second interface; the valve body is provided with a first connecting hole and a second connecting hole; 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; A connecting device is provided at one side of the valve body, and the first connecting hole and the second connecting hole can be connected through the connecting device.

[0006] Furthermore, the maximum diameter of the plug is larger than the end diameter of the valve body; when the plug moves to a restricted position in the direction of the second interface, 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 interface, and the second chamber is connected to the second interface. In this solution, when the plug moves to the restricted position (end pipe section), it is blocked, and gas cannot flow between the first chamber and the second chamber through the inner cavity of the valve body, so that the gas in the second chamber can flow into the first chamber through the connecting device and then be discharged from the first interface.

[0007] Furthermore, the check valve further comprises a fixed disk and a round tube, wherein the fixed disk is fixedly arranged on the inner cavity wall of the valve body, one end of the round tube is inserted through the middle of the fixed disk, and the other end of the round tube is fixedly connected to the plug and moves synchronously therewith. In this solution, the round tube is fixedly connected to the plug, and when the plug moves axially along the valve body, the round 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 round tube moves back and forth in the middle of the fixed disk when the round tube moves, which can play a role of limiting.

[0008] Furthermore, a compression spring is provided on the circular tube, and the compression spring is located between the fixed disk and the plug. In this solution, when the air pressure in the first chamber is less than the air pressure in the second chamber, the plug moves along the axial direction to squeeze the compression spring, and the compression spring is compressed; when the air pressure in the first chamber is greater than or equal to the air pressure in the second chamber, the compression spring stretches and resets to press against the plug.

[0009] Furthermore, the center line of the fixed plate and the center line of the round 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.

[0010] Further, the first connection hole and the second connection hole are respectively located on both sides of the axial direction of the plug. In this solution, the first connection hole is located below the fixed disk, and the second connection hole is located below the plug. When the plug separates the inner cavity of the valve body, the first connection hole and the second connection hole are connected to the first chamber and the second chamber respectively.

[0011] Furthermore, the fixed disk is provided with through holes; the through holes are provided in a plurality and the coverage rate of the through holes on the fixed disk is 60% to 90%. In this solution, the fixed disk is provided with through holes and the coverage rate is ensured, so that the gas can quickly flow through the fixed disk and then be discharged, thereby improving the exhaust gas discharge efficiency.

[0012] Furthermore, the plug is a disc-shaped structure, and a sealing ring is arranged on the plug. In this solution, the diameter of the outer end of the plug close to the second interface is smaller than the diameter of the inner end, and the sealing ring is sleeved on the outer end. The sealing ring is arranged on the plug to improve the sealing performance of the plug position.

[0013] Furthermore, the connection device includes a vacuum generator, and the vacuum generator 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 scheme, the vacuum port and the second connection hole are connected through a bend pipe, one end of the bend pipe is inserted into the second connection hole and kept sealed; the exhaust port is attached to the first connection hole and kept sealed. When the vacuum generator is closed, the first connection hole is not connected to the second connection hole, 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 turned on, the air supply port takes in air, the vacuum port draws air from the second connection hole, so that the second chamber is in a negative pressure state, and the exhaust port exhausts air into the first connection hole, so that the first chamber is 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 from the first chamber through the vacuum generator and is then discharged through the first interface.

[0014] Furthermore, a shell is arranged outside the middle pipe section of the valve body; the shell 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. In this solution, the shell is arranged outside the valve body to play a protective role and extend the service life of the device.

[0015] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art: The exhaust assisting device for a vacuum pump designed in the present invention 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 power loss of the vacuum pump, and the exhaust emission efficiency will be relatively improved, thereby promoting the emission of exhaust gas. The device utilizes compressed air to drive the exhaust emission, which helps to reduce the power of the vacuum pump during the frequent frequency reduction and frequency increase of the vacuum pump, and plays a partial buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the exhaust gas exhaust assisting device of the present invention; Figure 2 It is a schematic diagram of the valve body and related structures of the present invention; Figure 3 It is a schematic diagram of the internal structure of the valve body of the present invention; Figure 4 It is a schematic diagram of the check valve structure of the present invention; Figure 5 It is a schematic diagram of the check valve structure of the present invention; 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. fixed disk; 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. shell; 7. elbow. DETAILED DESCRIPTION

[0017] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0018] It should be noted that in the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which are only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, 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.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present 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, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0021] 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 definite definition of the protection scope of the present invention.

[0022] Example: 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: 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 thereof, and the first interface 101 and the second interface 102 are respectively provided at both ends of the valve body 1; 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.

[0023] The check valve 2 is arranged inside the middle pipe section of the valve body 1, and the check valve 2 includes a plug 201 that can move back and forth along the axial direction of the valve body 1; The connecting device 3 is arranged at 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 .

[0024] 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 to the 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 flow directly 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. In this embodiment, when the plug 201 moves to the restricted position (end pipe section), it is blocked, and gas cannot flow between the first chamber 4 and the second chamber 5 through the inner cavity of the valve body 1, so that the 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 interface 101. In addition, the check valve 2 also includes a fixed disk 202 and a round tube 203, the fixed disk 202 is fixedly arranged on the inner cavity wall of the valve body 1, one end of the round tube 203 is penetrated in the middle of the fixed disk 202, and the other end of the round 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, one end of the circular tube 203 moves back and forth in the middle of the fixed disk 202 when the circular tube 203 moves, which can play a limiting role.

[0025] In some embodiments, 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. In this embodiment, when the air pressure in the first chamber 4 is less than the air pressure in the second chamber 5, the plug 201 moves along the axial direction to squeeze the compression spring, and the compression spring is compressed; when the air pressure in the first chamber 4 is greater than or equal to the air pressure in the second chamber 5, the compression spring extends and resets to press against the plug 201.

[0026] See attached Figure 3 As shown, the center line of the fixed plate 202 and the center line of the round 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.

[0027] See attached Figure 3 As shown, the first connection hole 103 and the second connection hole 104 are respectively located on both sides of the axial direction of the plug 201. In this embodiment, the first connection hole 103 is located below the fixed disk 202, and the second connection hole 104 is located below the plug 201. When the plug 201 separates the inner cavity of the valve body 1, the first connection hole 103 and the second connection hole 104 are connected to the first chamber 4 and the second chamber 5 respectively.

[0028] See attached Figure 4As shown, a through hole 204 is provided on the fixed disk 202; a plurality of through holes 204 are provided and the coverage rate of the through holes 204 on the fixed disk 202 is 60% to 90%. In this embodiment, the through holes 204 are provided on the fixed disk 202 and the coverage rate is ensured, so that the gas can quickly flow through the fixed disk 202 and then be discharged, thereby improving the exhaust gas discharge efficiency.

[0029] See attached Figure 3 and attached Figure 4 As shown, in some embodiments, the plug 201 is a disc-shaped structure, and a sealing ring 205 is provided on the plug 201. The diameter of the outer end of the plug 201 close to the second interface 102 is smaller than the diameter of the inner end, and the sealing ring 205 is sleeved on the outer end. The sealing ring 205 is provided on the plug 201 to improve the sealing performance of the plug 201.

[0030] See attached Figure 5 As shown, the connection device 3 includes a vacuum generator 304, and the vacuum generator 304 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 is connected to the second connection hole 104 through a curved pipe 7, and one end of the curved pipe 7 is inserted into the second connection hole 104 and kept sealed; the exhaust port 302 is placed close to the first connection hole 103 to keep it sealed.

[0031] In some embodiments, the exhaust port 302 is provided with a round tube, and the round tube is integrally provided with the body of the vacuum generator 304 .

[0032] When the vacuum generator 304 is closed, the first connection hole 103 is not connected to the second connection hole 104, 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; When the vacuum generator 304 is turned on, air is taken in by the air supply port 301, and air is extracted from the second connecting hole 104 by the vacuum port 303, so that the second chamber 5 is in a negative pressure state, and air is exhausted into the first connecting hole 103 by the exhaust port 302, 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.

[0033] In some embodiments, the vacuum generator 304 is a pneumatic CV negative pressure vacuum generator 304 .

[0034] Since the speed of the motor and the size of the impeller have upper limits, the vacuum degree of each pump body has an upper limit. If a higher vacuum degree is required, it can only be completed by multi-stage series connection. The compression ratio of the vacuum pressure of a multi-stage vacuum pump has a great influence on the consumed electric energy. By increasing the pressure of one stage, the pressure of the previous stage can be reduced. When the pressure is reduced, the electric energy decreases, and the operating power of the main pump is reduced. The vacuum pump exhaust assist device is equivalent to a small dry pump, which can maintain the vacuum degree of the last stage of the vacuum pump. The consumption of electric energy is reduced by 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; the torque of the dry pump is reduced, thereby reducing the loss of vacuum pump power, and the exhaust gas emission efficiency is relatively improved.

[0035] See attached Figure 1 As shown, in some embodiments, a shell 6 is disposed outside the middle pipe section of the valve body 1; the 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. The shell 6 is disposed outside the valve body 1 to play a protective role and extend the service life of the device.

[0036] The exhaust assisting device for a vacuum pump designed in the present invention 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 power loss of the vacuum pump, and the exhaust emission efficiency will be relatively improved, thereby promoting the emission of exhaust gas. The device utilizes compressed air to drive the exhaust emission, which helps to reduce the power of the vacuum pump during the frequent frequency reduction and frequency increase of the vacuum pump, and plays a partial buffering role.

[0037] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum pump exhaust assisting device, connected to the exhaust tail end of the vacuum pump, characterized in that: include: A valve body (1), the valve body (1) being a tube structure, the diameter of the middle tube section of the valve body (1) being larger than the diameter of the end tube sections thereof, and the two ends of the valve body (1) being respectively provided with a first interface (101) and a second interface (102); the valve body (1) being provided with a first connecting hole (103) and a second connecting hole (104); 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), wherein the connecting device (3) is arranged 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. A vacuum pump exhaust assisting device according to claim 1, characterized in that: The maximum diameter of the plug (201) is greater 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 flow directly 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 assisting device according to claim 1, characterized in that: The check valve (2) further comprises a fixed disk (202) and a circular tube (203); 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. A vacuum pump exhaust assisting 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 fixing disk (202) and the plug (201).

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

7. The vacuum pump exhaust assisting device according to claim 3, characterized in that: The fixing 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 fixing disk (202) is 60% to 90%.

8. The vacuum pump tail gas exhaust assisting 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 tail gas exhaust assisting 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 tail gas exhaust assisting device according to claim 1, characterized in that: An outer shell (6) is arranged outside 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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