Energy-saving device for vacuum pump

Abstract

The utility model provides an energy-saving device for a vacuum pump, and belongs to the technical field of vacuum pumps. The energy-saving device comprises an inlet connecting piece connected to the exhaust side of the mechanical booster pump or the vacuum pump; the outlet connecting piece is connected with the inlet connecting piece; the vacuum generation structure is provided with an air inlet pipeline, a vacuum pipeline and an exhaust pipeline which are communicated with one another; the vacuum pipeline is communicated with the inlet connecting piece, the exhaust pipeline is communicated with the outlet connecting piece, the air inlet pipeline is used for introducing high-speed fluid, and the high-speed fluid forms negative pressure at the joint of the air inlet pipeline, the vacuum pipeline and the exhaust pipeline, so that tail exhaust gas of the mechanical booster pump or the vacuum pump is exhausted to the outlet connecting piece through the vacuum pipeline and the exhaust pipeline. The exhaust pressure of the mechanical booster pump or the vacuum pump can be reduced, and the device has the advantages of simple structure, low cost, remarkable energy conservation and the like.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of vacuum pumps, and particularly relates to an energy-saving device for a vacuum pump. BACKGROUND

[0002] In industrial machinery, a vacuum pump is a device for generating, improving, and maintaining a vacuum. Vacuum pumps have been applied to many industries of the national economy, including national defense science and technology, steel industry, coating, micro-electronic information, semiconductor, biomedicine, chemical industry, food, environmental protection, and the like. A vacuum pump continuously extracts gas by mechanical or physical means to maintain a low-pressure environment. This process requires a large amount of energy to overcome the gas pressure and friction, and in the use of a vacuum pump, the end of the vacuum pump has the maximum air density and thus the maximum pressure. When the last end is under positive pressure, a greater power is required to send out the gas, thereby increasing the energy consumption.

[0003] Therefore, in combination with the production process and the principle of a vacuum pump, it is urgent to reduce the energy consumption of a vacuum pump. CONTENT OF THE INVENTION

[0004] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides an energy-saving device for a vacuum pump.

[0005] The present disclosure provides an energy-saving device for a vacuum pump, which comprises:

[0006] An inlet connecting piece connected to an exhaust side of a mechanical supercharging pump or a vacuum pump;

[0007] An outlet connecting piece connected to the inlet connecting piece;

[0008] A vacuum generating structure having an air inlet pipeline, a vacuum pipeline, and an air outlet pipeline connected in communication; wherein,

[0009] The vacuum pipeline is in communication with the inlet connecting piece, the air outlet pipeline is in communication with the outlet connecting piece, and the air inlet pipeline is used to introduce a high-speed fluid. The high-speed fluid forms a negative pressure at the connection between the air inlet pipeline, the vacuum pipeline, and the air outlet pipeline, so that the exhaust gas of the mechanical supercharging pump or the vacuum pump is discharged to the outlet connecting piece through the vacuum pipeline and the air outlet pipeline.

[0010] Optionally, the cross-sectional area of the vacuum pipeline is smaller than the cross-sectional area of the air inlet pipeline and the air outlet pipeline.

[0011] Optionally, the vacuum pipeline is a flexible pipe.

[0012] Optionally, the air inlet pipeline is further connected with an air inlet structure.

[0013] Optionally, the vacuum pipeline is connected with the inlet connector through screw connection; and / or,

[0014] The exhaust pipeline is connected with the outlet connector through screw connection; and / or,

[0015] The inlet connector is connected with the outlet connector through screw connection.

[0016] Optionally, a one-way valve assembly is arranged between the inlet connector and the outlet connector, and the one-way valve assembly is located between the inlet connector and the exhaust pipeline.

[0017] Optionally, the inlet connector and the outlet connector adopt connecting flanges.

[0018] Optionally, the energy-saving device further comprises a shell, and the inlet connector, the outlet connector and the vacuum generating structure are fixed to the shell; and,

[0019] The gas inlet of the inlet connector, the gas outlet of the outlet connector and the gas inlet of the gas inlet pipeline are exposed outside the shell.

[0020] Optionally, the energy-saving device is integrated between a mechanical supercharging pump and a vacuum pump or the vacuum pump; or,

[0021] The energy-saving device is separately connected to an outlet flange of the mechanical supercharging pump or a tail exhaust pipeline of the vacuum pump.

[0022] Optionally, when the inlet connector is connected to the outlet flange of the mechanical supercharging pump, the outlet connector is connected with an inlet flange of the vacuum pump.

[0023] The present disclosure provides an energy-saving device for a vacuum pump, which comprises: an inlet connector connected to an exhaust side of a mechanical supercharging pump or a vacuum pump; an outlet connector connected with the inlet connector; a vacuum generating structure having a gas inlet pipeline, a vacuum pipeline and an exhaust pipeline connected in communication; wherein the vacuum pipeline is in communication with the inlet connector, the exhaust pipeline is in communication with the outlet connector, and the gas inlet pipeline is used to introduce high-speed fluid, which forms a negative pressure at the connection of the gas inlet pipeline, the vacuum pipeline and the exhaust pipeline, so that the tail exhaust gas of the mechanical supercharging pump or the vacuum pump is discharged to the outlet connector through the vacuum pipeline and the exhaust pipeline. By arranging the energy-saving device on the outlet flange of the mechanical supercharging pump or the tail exhaust pipeline of the vacuum pump, after the high-speed fluid is introduced into the gas inlet pipeline, the vacuum generating structure is driven to form a negative pressure at the connection of the three pipelines, the tail exhaust pressure of the mechanical supercharging pump or the vacuum pump is reduced, the tail exhaust gas is discharged to the outlet connector through the vacuum pipeline and the exhaust pipeline, the energy consumption of the vacuum pump is reduced, the temperature of the vacuum pump is further reduced, and the service life of the vacuum pump is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The overall structure schematic diagram of the energy-saving device capable of being integrated in the vacuum pump for the specific embodiment of the present disclosure;

[0025] Figure 2 The structure schematic diagram of the energy-saving device capable of being integrated in the vacuum pump for the specific embodiment of the present disclosure;

[0026] Figure 3 The structure schematic diagram of the energy-saving device integrated in the inter-stage flange for the specific embodiment of the present disclosure;

[0027] Figure 4 The structure schematic diagram of the energy-saving device integrated in the exhaust pipeline for the specific embodiment of the present disclosure;

[0028] Figure 5 The installation schematic diagram of the energy-saving device of the embodiment 1 of the present disclosure at the exhaust pipeline of the vacuum pump;

[0029] Figure 6 The installation schematic diagram of the energy-saving device of the embodiment 2 of the present disclosure at the exhaust pipeline of the mechanical supercharging pump;

[0030] Figure 7 The installation of the energy-saving device integrated in the inter-stage flange for the embodiment 3 of the present disclosure

[0031] Schematic diagram

[0032] Figure 8 The installation schematic diagram of the energy-saving device integrated in the exhaust pipeline for the embodiment 4 of the present disclosure. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present disclosure.

[0034] In some descriptions of the present disclosure, the terms "comprise" or "include" and the like do not limit the mentioned shapes, numbers, steps, actions, operations, components, elements and / or their groups, nor exclude the presence or addition of one or more other different shapes, numbers, steps, actions, operations, components, elements and / or their groups.

[0035] In some descriptions of the present disclosure, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features.

[0036] In some descriptions of the disclosure, the terms "mounting", "connecting", "connected", or "fixed" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect through intermediate media, can be internal communication of two elements or interaction relationship of two elements.

[0037] In some descriptions of the disclosure, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to represent the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] As shown in Figures 1 to 4 The energy-saving device 100 for the vacuum pump is provided, which comprises an inlet connecting piece 110, an outlet connecting piece 120 and a vacuum generating structure 130. The inlet connecting piece 110 is connected to the exhaust side of the mechanical supercharging pump or the vacuum pump. The outlet connecting piece 120 is connected with the inlet connecting piece 110. The vacuum generating structure 130 has an air inlet pipeline 131, a vacuum pipeline 132 and an exhaust pipeline 133 connected in communication. The vacuum pipeline 132 is in communication with the inlet connecting piece 110, the exhaust pipeline 133 is in communication with the outlet connecting piece 120, and the air inlet pipeline 131 is used to pass in high-speed fluid. The high-speed fluid forms negative pressure at the connection of the air inlet pipeline 131, the vacuum pipeline 132 and the exhaust pipeline 133, so that the tail exhaust gas of the mechanical supercharging pump or the vacuum pump is discharged to the outlet connecting piece 120 through the vacuum pipeline 132 and the exhaust pipeline 133.

[0039] In the embodiment, the energy-saving device is connected to the exhaust side of the mechanical supercharging pump or the vacuum pump. After the high-speed fluid is passed into the air inlet pipeline, the vacuum generating structure is driven to form negative pressure at the connection of the three pipelines, so as to reduce the tail exhaust pressure of the mechanical supercharging pump or the vacuum pump, and make the tail exhaust gas discharged to the outlet connecting piece through the vacuum pipeline and the exhaust pipeline.

[0040] It should be understood that according to Bernoulli's principle, when fluid flows in a pipeline, if the cross-sectional area of the pipeline at a certain place is smaller, the flow rate increases and the pressure decreases, and when the flow rate increases to a certain value, the pressure will be less than one atmosphere, that is, negative pressure is generated. Therefore, the cross-sectional area of the vacuum pipeline is preferably smaller than the cross-sectional area of the intake pipeline and the exhaust pipeline, so that the vacuum pipeline and the exhaust pipeline, the intake pipeline form a vacuum port at the connection, and when the high-speed fluid enters the intake pipeline of the vacuum generating structure, a vacuum is generated at the vacuum port, which rapidly removes the exhaust gas and reduces the exhaust pressure of the vacuum pump or mechanical supercharging pump.

[0041] It should also be understood that the intake pipeline, the exhaust pipeline and the vacuum pipeline can be formed integrally or separately, as long as they are connected and negative pressure is generated at the connection.

[0042] In some preferred embodiments, as shown in Figures 1 to 4 The intake pipeline 131 and the exhaust pipeline 133 are located at the same horizontal plane. That is, the intake pipeline and the exhaust pipeline are an integral pipeline, the inlet end of the integral pipeline serves as the air inlet of the intake pipeline, the outlet end of the integral pipeline serves as the exhaust port of the exhaust pipeline, and the exhaust port is connected to the outlet connector, and the vacuum pipeline 132 is connected to the integral pipeline to form a "T" shaped structure, and the vacuum pipeline is connected to the inlet connector.

[0043] In other preferred embodiments, as shown in Figures 1 to 4 The vacuum pipeline 132 can be a hose, that is, the length of the hose can be selected according to actual needs, and one end of the hose is connected to the intake pipeline 131 and the exhaust pipeline 133, and the other end is connected to the inlet connector 110.

[0044] In other preferred embodiments, as shown in Figures 1 to 4 The air inlet of the intake pipeline 131 is also connected to the air inlet structure 134, which is connected to the intake pipeline 131 by bolts or other means, for introducing high-speed fluid.

[0045] It should be noted that the present embodiment does not specifically limit the connection mode between the vacuum pipeline and the inlet connector, the exhaust pipeline and the outlet connector, and the inlet connector and the outlet connector, for example, threaded connection, clamp connection or socket connection, etc.

[0046] In some preferred embodiments, the vacuum pipeline and the inlet connector, the exhaust pipeline and the outlet connector, and the inlet connector and the outlet connector can be preferably threaded, that is, one end of one is provided with external threads, and the other end of the other is provided with internal threads, and the external threads and the internal threads are connected by threaded connection.

[0047] Of course, in other preferred cases, for example, when the vacuum pipeline is screwed with the inlet connector, a nut can also be added on the outer thread, and the pipeline and the connector are tightly connected by screwing the nut on the outer thread.

[0048] Of course, in other preferred cases, for example, when the inlet connector is screwed with the outlet connector, a sealing ring (for example, an O-ring) can also be arranged at the connection of the two, and static sealing is performed through the sealing ring.

[0049] In other preferred embodiments, after the inlet connector 110 is screwed with the outlet connector 120, a connection channel is formed between the two, and a one-way valve assembly 140 should also be arranged on the connection channel to prevent backflow of the exhaust gas. In addition, the one-way valve assembly 140 should be located between the inlet connector 110 and the exhaust pipeline 133, that is, the one-way valve assembly 140 is located at least at a position higher than the exhaust port of the exhaust pipeline 133, so that the exhaust gas can be smoothly discharged to the outlet connector through the exhaust pipeline.

[0050] Further, it should be noted that the inlet connector and the outlet connector of the present embodiment can adopt a connecting flange, for example, the inlet connector adopts an inlet flange, and the outlet connector adopts an outlet flange, which has good sealing performance and is convenient to install and disassemble.

[0051] Still, it should be noted that the present embodiment does not specifically limit the exhaust side of the mechanical booster pump, which can be the exhaust end of the mechanical booster pump or the outlet flange of the mechanical booster pump, and when connected to the outlet flange, the energy-saving device is equivalent to an inter-stage flange. Similarly, the exhaust side of the vacuum pump can be the exhaust end of the vacuum pump or the exhaust pipeline of the vacuum pump.

[0052] It can be understood that the energy-saving device based on the present embodiment can be connected to the mechanical booster pump or the vacuum pump, so that the energy-saving device can be integrated in the vacuum generating system formed by the mechanical booster pump and the vacuum pump, for example, the energy-saving device can be assembled on the exhaust side of the mechanical booster pump or integrated on the inter-stage flange. Of course, the energy-saving device can also be assembled on the exhaust side of the vacuum pump or integrated on the exhaust pipeline of the vacuum pump, and no specific limitation is made, which can be specifically set according to actual needs.

[0053] As shown in FIG. 1, the energy-saving device 100 is connected to the exhaust side of the mechanical booster pump 200 and the exhaust side of the vacuum pump 300. Figure 3As shown, in some preferred embodiments, when the energy-saving device 100 is integrated into the interstage flange, the inlet connector 110 of the energy-saving device is connected to the outlet flange of the mechanical booster pump, and the outlet connector 120 is connected to the inlet flange of the vacuum pump. That is, the energy-saving device is integrated between the mechanical booster pump and the vacuum pump. Furthermore, a vacuum generating structure 130 can be provided on the left side of the inlet connector 110 and the outlet connector 120. The vacuum pipeline 132 is connected to the left side wall of the inlet connector 110, and the exhaust pipeline 133 is connected to the left side wall of the outlet connector 120. An intake structure 134 is provided on the left side of the intake pipeline 131. Of course, the vacuum generating structure can also be provided on the right side of the inlet connector and the outlet connector. In this way, when the energy-saving device is working, the exhaust pressure of the mechanical booster pump is reduced, and the load is decreased.

[0054] like Figure 4 As shown, in some other preferred embodiments, when the energy-saving device 100 is integrated into the tailpipe of the vacuum pump, the inlet connector 110 of the energy-saving device is connected to the outlet flange of the vacuum pump. That is, the energy-saving device is located below the vacuum pump, and the vacuum generating structure 130 is located above the inlet connector 110 and the outlet connector 120. In this way, the energy-saving device can reduce the exhaust pressure of the vacuum pump and reduce the load on the vacuum pump when it is working.

[0055] Of course, when the energy-saving device is installed separately, a housing should also be provided to accommodate the inlet connector, outlet connector and vacuum generating structure, so as to protect the internal structure and facilitate installation. However, there are no specific restrictions on the material of the housing; for example, sheet metal housing can be used.

[0056] For example, such as Figure 1 and Figure 2 As shown, the energy-saving device 100 also includes a housing 150, an inlet connector 110, an outlet connector 120, and a vacuum generating structure 130, all of which are fixed within the housing 150. The air inlet of the inlet connector 110 should protrude outside the housing 150, and similarly, the air outlet of the outlet connector 120 should also protrude outside the housing 150. Furthermore, the air intake structure 134 should also protrude outside the housing 150 to facilitate the introduction of high-speed fluid. In other words, the assembled inlet connector, outlet connector, and vacuum generating structure are fixed to the housing. The inlet connector exposed outside the housing is used to connect to a vacuum pump or a mechanical booster pump, and the air intake structure is used to introduce high-speed fluid.

[0057] In some preferred embodiments, such as Figure 1 and Figure 2 As shown, the inlet connector 110 and the outlet connector 120 are fixed to one side of the housing 150 by bolts. For example, threaded holes are provided on the inlet connector and the outlet connector, and bolts are inserted into the threaded holes. The air intake structure 134 is inserted into the other side of the housing 150.

[0058] The application of the energy-saving device will be further illustrated below in combination with specific embodiments:

[0059] Embodiment 1

[0060] As shown in Figure 5 , the present example gives an energy-saving device separately installed in the tail exhaust pipeline of a vacuum pump, which comprises a shell 150, and an inlet connector 110, an outlet connector 120 and a vacuum generating structure 130 accommodated in the shell 150. The inlet connector is an inlet flange, the outlet connector is an outlet flange, and the shell is a sheet metal shell.

[0061] Please continue to refer to Figure 5 , the inlet connector 110 is connected to one side of the shell 150 through a first bolt 151, the outlet connector 120 is connected to one side of the shell 150 through a second bolt 152, and the gas inlet structure 134 is provided on the other side of the shell 150. Secondly, the inlet connector 110 of the energy-saving device is connected to the tail exhaust flange 222 of the vacuum pump 220; the outlet connector 120 of the energy-saving device is connected to the inlet connector 110 by screwing, and a one-way valve assembly 140 is arranged on the connecting channel between the inlet connector 110 and the outlet connector 120.

[0062] Please continue to refer to Figure 5 , the vacuum generating structure 130 has a gas inlet pipeline 131, a vacuum pipeline 132 and an exhaust pipeline 133 connected in communication; wherein the vacuum pipeline is a hose, and the vacuum pipeline 132 is connected to the inlet connector 110 by screwing, the exhaust pipeline 133 is connected to the outlet connector 120 by screwing, and the gas inlet structure 134 is connected to the gas inlet of the gas inlet pipeline 131, for passing in high-speed fluid, which forms a negative pressure at the connection of the gas inlet pipeline 131, the vacuum pipeline 132 and the exhaust pipeline 133, so that the exhaust gas of the vacuum pump 220 is discharged to the outlet connector 120 through the vacuum pipeline 132 and the exhaust pipeline 133.

[0063] The energy-saving device of the present embodiment 1 is separately installed in the tail exhaust pipeline of the vacuum pump, the energy-saving device inlet flange is connected to the vacuum pump tail exhaust flange, and the energy-saving device reduces the exhaust pressure of the vacuum pump and reduces the load of the vacuum pump when working.

[0064] Embodiment 2

[0065] As shown in Figure 6As shown, the example gives a kind of energy-saving device installed between the mechanical supercharging pump 210 and the vacuum pump 220, which comprises a shell 150, and an inlet connector 110, an outlet connector 120 and a vacuum generating structure 130 accommodated in the shell 150. The inlet connector is an inlet flange, the outlet connector is an outlet flange, and the shell is a sheet metal shell.

[0066] Please continue to refer to Figure 6 The inlet connector 110 is connected to one side of the shell 150 by a first bolt 151, the outlet connector 120 is connected to the other side of the shell 150 by a second bolt 152, and the air inlet structure 134 is provided on the other side of the shell 150. Secondly, the inlet connector 110 of the energy-saving device is connected to the outlet flange 211 of the mechanical supercharging pump 210; the outlet connector 120 of the energy-saving device is connected to the inlet connector 110 by screwing, and a one-way valve assembly 140 is arranged on the connecting channel between the inlet connector 110 and the outlet connector 120, and the outlet connector 120 of the energy-saving device is connected to the inlet flange 221 of the vacuum pump 220.

[0067] Please continue to refer to Figure 6 The vacuum generating structure 130 has an air inlet pipeline 131, a vacuum pipeline 132 and an exhaust pipeline 133 connected in series; the vacuum pipeline is a hose, the vacuum pipeline 132 is connected to the inlet connector 110 by screwing, the exhaust pipeline 133 is connected to the outlet connector 120 by screwing, and the air inlet pipeline 131 is connected with an air inlet structure 134 at the air inlet thereof for introducing high-speed fluid, which forms negative pressure at the connection of the air inlet pipeline 131, the vacuum pipeline 132 and the exhaust pipeline 133, so that the exhaust gas of the mechanical supercharging pump 210 is discharged to the outlet connector 120 through the vacuum pipeline 132 and the exhaust pipeline 133.

[0068] The energy-saving device of the second embodiment is installed separately between the mechanical supercharging pump and the vacuum pump, connected by the outlet flange of the mechanical supercharging pump and the inlet flange of the energy-saving device, and the working of the energy-saving device reduces the exhaust pressure of the mechanical supercharging pump and reduces the load.

[0069] Embodiment 3

[0070] As shown in Figure 7 The example gives a kind of energy-saving device integrated between the mechanical supercharging pump 210 and the vacuum pump 220, which comprises an inlet connector 110, an outlet connector 120 and a vacuum generating structure 130. The inlet connector is an inlet flange, and the outlet connector is an outlet flange.

[0071] Please continue to refer to Figure 7The inlet connecting piece 110 of the energy-saving device is connected to the outlet flange 211 of the mechanical supercharging pump 210; the outlet connecting piece 120 of the energy-saving device is connected to the inlet connecting piece 110 through screw connection, and a one-way valve assembly 140 is arranged on the connecting channel between the inlet connecting piece 110 and the outlet connecting piece 120, and the outlet connecting piece 120 of the energy-saving device is connected to the inlet flange 221 of the vacuum pump 220.

[0072] Please continue to refer to Figure 7 The vacuum generating structure 130 has an air inlet pipeline 131, a vacuum pipeline 132 and an exhaust pipeline 133 connected in series; the vacuum pipeline is a hose, the vacuum pipeline 132 is connected to the inlet connecting piece 110 through screw connection, the exhaust pipeline 133 is connected to the outlet connecting piece 120 through screw connection, and the air inlet of the air inlet pipeline 131 is connected to an air inlet structure 134 for introducing high-speed fluid, which forms negative pressure at the connection of the air inlet pipeline 131, the vacuum pipeline 132 and the exhaust pipeline 133, so that the exhaust gas of the mechanical supercharging pump 210 is discharged to the outlet connecting piece 120 through the vacuum pipeline 132 and the exhaust pipeline 133.

[0073] The energy-saving device of the embodiment 3 is integrated on the inter-stage flange, and a hose is connected to the inlet connecting piece of the energy-saving device. The inter-stage flange is installed between the mechanical supercharging pump and the vacuum pump, the outlet flange of the mechanical supercharging pump is connected to the inlet flange of the inter-stage flange, and the energy-saving device reduces the exhaust pressure of the mechanical supercharging pump and reduces the load when working.

[0074] Embodiment 4

[0075] As shown in Figure 8 , the example gives an energy-saving device integrated in the vacuum pump exhaust pipeline, which includes an inlet connecting piece 110, an outlet connecting piece 120 and a vacuum generating structure 130. The inlet connecting piece is an inlet flange, and the outlet connecting piece is an outlet flange.

[0076] Please continue to refer to Figure 8 The mechanical supercharging pump 210 and the vacuum pump 220 form a vacuum generating system 200, wherein the outlet flange 211 of the mechanical supercharging pump 210 is connected to the inlet flange 221 of the vacuum pump 220, and the inlet connecting piece 110 of the energy-saving device is connected to the exhaust flange 222 of the vacuum pump 220; the outlet connecting piece 120 of the energy-saving device is connected to the inlet connecting piece 110 through screw connection, and a one-way valve assembly 140 is arranged on the connecting channel between the inlet connecting piece 110 and the outlet connecting piece 120, and the outlet connecting piece 120 of the energy-saving device is installed at the tail of the vacuum pump 220.

[0077] Please continue to refer to Figure 8The vacuum generating structure 130 has an air inlet pipeline 131, a vacuum pipeline 132 and an exhaust pipeline 133 in communication; the vacuum pipeline is a hose, the vacuum pipeline 132 is in communication with the inlet connector 110 through screw thread, the exhaust pipeline 133 is in communication with the outlet connector 120 through screw thread, and the air inlet pipeline 131 is connected with an air inlet structure 134 at an air inlet for the inlet of high-speed fluid, the high-speed fluid forms negative pressure at the connection of the air inlet pipeline 131, the vacuum pipeline 132 and the exhaust pipeline 133, so that the exhaust gas of the vacuum pump 220 is discharged to the outlet connector 120 through the vacuum pipeline 132 and the exhaust pipeline 133.

[0078] The energy-saving device of the embodiment 4 is integrated on the exhaust pipeline of the vacuum pump, connected with the inlet connector of the energy-saving device through a hose, and the outlet connector is installed at the tail of the vacuum pump, so that the energy-saving device can reduce the exhaust pressure of the vacuum pump and the load of the vacuum pump when working.

[0079] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered as the protection scope of the present disclosure.

Claims

1. An energy saving device for a vacuum pump, characterized in that, The energy-saving device comprises: an inlet connector connected to the exhaust side of the mechanical supercharging pump or vacuum pump; an outlet connector connected to the inlet connector; a vacuum generating structure having an air inlet pipeline, a vacuum pipeline and an air outlet pipeline connected in series; wherein, the vacuum pipeline is connected to the inlet connector, the air outlet pipeline is connected to the outlet connector, and the air inlet pipeline is used to introduce high-speed fluid to form negative pressure at the connection of the air inlet pipeline, the vacuum pipeline and the air outlet pipeline, so that the exhaust gas of the mechanical supercharging pump or vacuum pump is discharged to the outlet connector through the vacuum pipeline and the air outlet pipeline.

2. The energy saving device for a vacuum pump according to claim 1, characterized in that, The cross-sectional area of the vacuum pipeline is smaller than that of the air inlet pipeline and the air outlet pipeline.

3. The energy saving device for a vacuum pump according to claim 1, characterized in that, The vacuum pipeline is a hose.

4. The energy saving device for a vacuum pump according to claim 1, characterized in that, The air inlet pipeline is further connected to an air inlet structure.

5. The energy saving device for a vacuum pump according to claim 1, characterized in that, The vacuum pipeline and the inlet connector are connected by threads; and / or, the air outlet pipeline and the outlet connector are connected by threads; and / or, the inlet connector and the outlet connector are connected by threads.

6. The energy saving device for a vacuum pump according to claim 5, characterized in that, A one-way valve assembly is arranged between the inlet connector and the outlet connector, and the one-way valve assembly is located between the inlet connector and the air outlet pipeline.

7. The energy saving device for a vacuum pump according to claim 1, characterized in that, The inlet connector and the outlet connector are connected flanges.

8. The energy saving device for a vacuum pump according to claim 1, characterized in that, The energy-saving device further comprises a housing, and the inlet connector, the outlet connector and the vacuum generating structure are fixed to the housing; and, the air inlet of the inlet connector, the air outlet of the outlet connector and the air inlet of the air inlet pipeline are exposed outside the housing.

9. The energy saving device for a vacuum pump according to claim 1, wherein The energy-saving device is integrated between the mechanical supercharging pump and the vacuum pump; or, The energy-saving device is separately connected to the outlet flange of the mechanical supercharging pump or the exhaust pipeline of the vacuum pump.

10. The energy saving device for a vacuum pump according to claim 9, characterized in that, When the inlet connector is connected to the outlet flange of the mechanical supercharging pump, the outlet connector is connected to the inlet flange of the vacuum pump.

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