Variable-frequency vacuum pump machine with gas-liquid separation function

Abstract

The invention discloses a variable-frequency vacuum pump machine with a gas-liquid separation function, and relates to the technical field of variable-frequency vacuum pump machines, the variable-frequency vacuum pump machine comprises a variable-frequency motor main body, a pump main body, an impeller, a conveying shaft and two inlets and outlets, the variable-frequency motor main body is connected with the impeller through the conveying shaft, and the impeller is located in the pump main body; the two inlets and outlets are located in the side wall of the pump body, and water flow of the two inlets and outlets flows along the inner wall of the pump body under the centrifugal force effect of the impeller. Gas enters the fixing cover from the ventilation column, the gas can be separated from liquid in the pump body, the vacuum degree can meet the set requirement, the gas extraction efficiency is improved, part of liquid is accumulated in the annular sleeve and flows into the pump body, the liquid is prevented from flowing back into the exhaust column through the one-way valve, and the gas extraction efficiency is improved. And gas and liquid can be further separated, equipment abrasion is reduced, liquid in the floating plate can flow back into the pump body, and the situation that the liquid enters the floating plate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of variable frequency vacuum pump machines, in particular to a variable frequency vacuum pump machine with gas-liquid separation function. BACKGROUND

[0002] The variable frequency vacuum pump machine is a device for extracting and transporting gas or liquid by adjusting the running speed of the pump through variable frequency technology. The variable frequency vacuum pump machine is usually composed of a vacuum pump body and a variable frequency drive system. The variable frequency drive system adjusts the motor speed by adjusting the power supply frequency of the motor according to the actual gas consumption or vacuum degree requirement, and then adjusts the air extraction rate and vacuum degree of the vacuum pump. In the prior art, the gas-liquid mixing in the variable frequency vacuum pump reduces the vacuum performance. After the gas mixes into the liquid, the effective pressure in the pump is reduced, the vacuum degree cannot meet the set requirement, the air extraction efficiency is significantly reduced, the equipment wear is intensified, the gas bubbles formed by gas-liquid mixing are broken in the compression process, causing cavitation phenomenon, damaging key components such as impeller and pump body. In order to overcome the influence of gas-liquid mixing, the pump needs to consume additional energy, and the component wear is accelerated, the maintenance frequency and cost are increased. SUMMARY

[0003] The purpose of the present application is to provide a variable frequency vacuum pump machine with gas-liquid separation function to solve the problem of gas mixing into liquid in the variable frequency vacuum pump, which reduces the effective pressure in the pump, causes the vacuum degree to fail to meet the set requirement, significantly reduces the air extraction efficiency, intensifies the equipment wear, breaks the gas bubbles formed by gas-liquid mixing in the compression process, causes cavitation phenomenon, damages key components such as impeller and pump body, and needs to consume additional energy to overcome the influence of gas-liquid mixing, and the component wear is accelerated, the maintenance frequency and cost are increased.

[0004] The purpose of the present application can be achieved by the following technical scheme: A variable frequency vacuum pump machine with gas-liquid separation function, comprising a variable frequency motor body, a pump body, an impeller, a conveying shaft and two inlets and outlets, the variable frequency motor body is connected with the impeller through the conveying shaft, the impeller is located in the inside of the pump body, the two inlets and outlets are located on the side wall of the pump body, the water flow of the two inlets and outlets flows along the inner wall of the pump body under the action of the centrifugal force of the impeller, a gas-liquid separation assembly is arranged in the inside of the pump body, the gas-liquid separation assembly comprises a partition plate, the partition plate is installed in the inside of the pump body, a fixed cover is welded on the surface of the partition plate and outside the conveying shaft, a ring-shaped plate is welded on the outside of the impeller, a circle of air permeable columns are installed on the surface of the partition plate and inside the ring-shaped plate, the air permeable columns are used for sending the air in the inside of the ring-shaped plate into the inside of the fixed cover, an exhaust column is connected between the side wall of the pump body and the side wall of the fixed cover, the exhaust column is used for exhausting the air in the fixed cover to the outside of the pump body.

[0005] As a preferred embodiment of the present invention, the top of the venting column is higher than the exhaust column, the bottom of the venting column is in contact with the lower surface of the partition plate, the top of the impeller has a ring of reserved grooves, the reserved grooves are arranged in a ring array, the venting columns are arranged in a ring array, and the position of the reserved grooves is adapted to the bottom of the venting column.

[0006] As a preferred embodiment of the present invention, the exhaust column is a telescopic hollow tube, the elongation of the exhaust column is greater than the difference in radial distance between the fixed cover and the pump body, one end of the exhaust column is connected to the side wall of the fixed cover, and the other end of the exhaust column is connected to the side wall of the pump body.

[0007] As a preferred technical solution of the present invention, reserved openings are provided at each top end where the annular plate and the impeller intersect. The reserved openings are used for airflow to enter the interior of the annular plate from the outside. A flow stop plate is welded to the inner wall of the annular plate to prevent liquid from entering the inner wall of the annular plate. The impeller uses centrifugal force to make the gas located on the lower surface of the partition plate. The gas enters the fixed cover from the vent column, and the top of the vent column is higher than the liquid height below the partition plate. This can separate the gas from the liquid inside the pump body, and the vacuum degree can reach the set requirements, thus increasing the pumping efficiency.

[0008] As a preferred embodiment of the present invention, a drainage assembly is provided outside the exhaust column and between the side wall of the pump body and the side wall of the fixed cover. The drainage assembly includes an annular sleeve, which is located below the exhaust column. Both ends of the annular sleeve are welded with connecting sleeves. The interior of the connecting sleeve is slidably connected to the exhaust column. Both connecting sleeves of the annular sleeve are connected to the interior of the exhaust column. The interior of the annular sleeve is used to collect liquid in the exhaust column. The bottom end of the annular sleeve is connected to a first return pipe. The bottom end of the first return pipe is connected to the surface of the partition plate. Both ends of the first return pipe are connected to the annular sleeve and the interior of the pump body. The first return pipe is used to return the liquid in the exhaust column and the annular sleeve to the interior of the pump body.

[0009] As a preferred technical solution of the present invention, a one-way valve is provided in the middle of the annular sleeve. The one-way valve is used for unidirectional flow of liquid inside the annular sleeve and is used to prevent liquid inside the pump body from entering the annular sleeve. The airflow in the fixed cover is discharged from the exhaust column, and some liquid accumulates inside the annular sleeve and flows into the pump body. The one-way valve prevents the liquid from flowing back into the exhaust column, which can further separate the gas and liquid and reduce equipment wear.

[0010] As a preferred embodiment of the present invention, a reflux assembly is provided inside the fixed cover. The reflux assembly includes a floating plate, which is sleeved on the outside of each ventilating column. The floating plate slides relative to each ventilating column. An expansion airbag is provided outside each ventilating column and below the floating plate. The top of the expansion airbag is fixed to the floating plate, one end of the expansion airbag is connected to the outside of the pump body, and an air nozzle is provided at the end of the expansion airbag for inflating or discharging gas.

[0011] As a preferred technical solution of the present invention, a second return pipe is provided at the bottom of the floating plate and at the corresponding position of each ventilating column. The second return pipe is in the shape of an inverted V. The bottom end of the second return pipe is slidably connected to the upper end of the ventilating column. The second return pipe is used to return the liquid inside the floating plate to the inside of the ventilating column. A spacer sleeve is provided in the middle of the fixed cover and the middle of the spacer plate. The spacer sleeve is slidably connected to the floating plate.

[0012] As a preferred embodiment of the present invention, gas is injected into the inflatable airbag, causing the airbag to expand, and the expanded airbag is used to move the floating plate upward.

[0013] As a preferred embodiment of the present invention, the gas inside the expansion bladder is discharged, and the inside of the expansion bladder contracts. The contracted expansion bladder is used to move the floating plate downward. The expansion and contraction of the expansion bladder causes the floating plate to rise and fall. A large amount of liquid can accumulate in the floating plate, and the liquid in the floating plate can be returned to the pump body, reducing the amount of liquid entering the floating plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Equipped with a gas-liquid separation component, the impeller uses centrifugal force to keep the gas on the lower surface of the partition plate. The gas enters the fixed cover from the vent column, and the top of the vent column is higher than the liquid height below the partition plate. This can separate the gas from the liquid inside the pump body, and the vacuum degree can reach the set requirements, thus increasing the pumping efficiency. Equipped with a drainage component, the airflow in the fixed cover is discharged from the exhaust column, and some liquid accumulates inside the annular sleeve and flows into the pump body. The one-way valve prevents the liquid from flowing back into the exhaust column, which can further separate the gas and liquid and reduce equipment wear. Equipped with a reflux component, the floating plate is raised and lowered by the expansion and contraction of the expansion air bladder. The floating plate can accumulate a large amount of liquid, which can be refluxed back into the pump body, reducing the amount of liquid entering the floating plate. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a structural diagram of the main structure of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the pump body of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 3 This is a schematic diagram of the gas-liquid separation component of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 4 This is a schematic diagram of the air-permeable column and reserved groove of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 5 This is a schematic diagram of a flow stop plate for a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 6 This is a schematic diagram of the liquid inside the pump body of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 7 This is a schematic diagram of the liquid discharge assembly of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 8 This is a schematic diagram of the annular sleeve and air nozzle of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 9 This is a schematic diagram of the reflux assembly of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 10 This is a schematic diagram of the expansion bladder of a variable frequency vacuum pump with gas-liquid separation function according to the present invention; Figure 11 This is a schematic diagram showing the bottom end of the second return pipe of a variable frequency vacuum pump with gas-liquid separation function of the present invention aligned with the second return pipe.

[0017] In the diagram: 1. Variable frequency motor body; 2. Pump body body; 3. Inlet and outlet; 4. Impeller; 5. Gas-liquid separation assembly; 6. Conveying shaft; 7. Drainage assembly; 8. Return assembly; 51. Spare plate; 52. Annular plate; 53. Reserved opening; 54. Fixed cover; 55. Ventilation column; 56. Exhaust column; 57. Reserved groove; 58. Stop plate; 71. Annular sleeve; 72. Connecting sleeve; 73. One-way valve; 74. First return pipe; 81. Floating plate; 82. Expansion air bladder; 83. Air nozzle; 84. Spare sleeve; 85. Second return pipe. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0019] Please see Figure 1 - Figure 6 As shown, a variable frequency vacuum pump with gas-liquid separation function includes a variable frequency motor body 1, a pump body 2, an impeller 4, a conveying shaft 6, and two inlets / outlets 3. The variable frequency motor body 1 is connected to the impeller 4 via the conveying shaft 6. The impeller 4 is located inside the pump body 2. The two inlets / outlets 3 are located on the side walls of the pump body 2. Water flows along the inner wall of the pump body 2 under the centrifugal force of the impeller 4. When the variable frequency motor body 1 is started, it drives the impeller 4 in the pump body 2 to rotate. One inlet / outlet 3 draws in water, and the other inlet / outlet 3 drains water. Because the liquid rotates on the inner wall of the pump body 2 under the centrifugal force of the impeller 4, there is more liquid at the bottom of the pump body 2 and less liquid at the top. The top of the pump body 2 is used to retain gas. A gas-liquid separation component 5 is provided inside the pump body 2. The gas-liquid separation component 5 includes a partition plate 51, which is installed inside the pump body 2 and welded to the inner wall of the pump body 2. A fixed cover 54 is welded to the surface of the partition plate 51 and outside the conveying shaft 6. The rotation of the impeller 4 will not affect the rotation of the components above the partition plate 51. An annular plate 52 is welded to the outside of the impeller 4. The rotation of the impeller 4 can drive the annular plate 52 to rotate. The liquid inside the pump body 2 is driven by the impeller 4, so that the liquid inside the pump body 2 forms an inverted V-shape. A ring of venting columns 55 is installed on the surface of the partition plate 51 and inside the annular plate 52. The venting columns 55 are used to send the air inside the annular plate 52 into the fixed cover 54. The venting columns 55 can allow the gas on the lower surface of the partition plate 51 to flow from the pump body 2 into the fixed cover 54. An exhaust column 56 is connected between the side wall of the pump body 2 and the side wall of the fixed cover 54. The exhaust column 56 is used to exhaust the air in the fixed cover 54 to the outside of the pump body 2. The airflow inside the fixed cover 54 is exhausted to the outside of the pump body 2 through the exhaust column 56, which can discharge the airflow inside the pump body 2 from the liquid in the pump body 2.

[0020] Please see Figure 3 and Figure 6As shown, the top of the vent column 55 is higher than the position of the exhaust column 56, and the bottom of the vent column 55 is in contact with the lower surface of the partition plate 51. A ring of reserved grooves 57 is opened at the top of the impeller 4. The reserved grooves 57 are arranged in a ring array, and the vent columns 55 are arranged in a ring array. The position of the reserved grooves 57 is adapted to the bottom of the vent column 55. Since the gas inside the pump body 2 is connected to the top of the vent column 55, the liquid is located inside the pump body 2. Therefore, the liquid inside the pump body 2 will not enter the top of the vent column 55 from the inside of the pump body 2.

[0021] Please see Figure 4 and Figure 6 As shown, the exhaust column 56 is a telescopic hollow tube. The elongation of the exhaust column 56 is greater than the radial distance difference between the fixed cover 54 and the pump body 2. The length of the exhaust column 56 can be changed so that both ends of the exhaust column 56 contact the side wall of the fixed cover 54 and the side wall of the pump body 2, respectively. The exhaust column 56 is installed between the pump body 2 and the exhaust column 56. One end of the exhaust column 56 is connected to the side wall of the fixed cover 54, and the other end of the exhaust column 56 is connected to the side wall of the pump body 2. The airflow enters the interior of the exhaust column 56 from the top of the fixed cover 54 and exits from the interior of the pump body 2.

[0022] Please see Figure 4 and Figure 5 As shown, a reserved opening 53 is provided at each of the top ends where the annular plate 52 and the impeller 4 intersect. The reserved opening 53 is used for airflow to enter the interior of the annular plate 52 from the outside. A flow stop plate 58 is welded to the inner wall of the annular plate 52. The flow stop plate 58 is used to prevent liquid from entering the inner wall of the annular plate 52. The gas outside the annular plate 52 enters the interior of the annular plate 52 through the reserved opening 53, and the gas inside the annular plate 52 enters the fixed cover 54 from the inside of the vent column 55.

[0023] It should be noted that the variable frequency motor body 1 drives the impeller 4 inside the pump body body 2 to rotate, so that the liquid enters from one inlet / outlet 3 and flows out from the other inlet / outlet 3. As the liquid rotates due to the rotation of the impeller 4, the liquid in the pump body body 2 will create space inside the pump body body 2 under the action of centrifugal force. Some air in the liquid will be trapped on the lower surface of the partition plate 51, and the gas will also enter the interior of the annular plate 52 from the reserved port 53. At this time, the air can be discharged into the fixed cover 54 through the vent column 55. The liquid is discharged from the two inlets / outlets 3 under the action of centrifugal force, and the gas inside the fixed cover 54 is discharged from the exhaust column 56. Outside the pump body 2, as the impeller 4 rotates relative to the venting column 55, the reserved groove 57 of the impeller 4 can prevent the venting column 55 from interfering with the impeller 4. The venting column 55 flows into the pump body 2 and can be guided to the bottom of the pump body 2 by the stop plate 58. Under the action of centrifugal force, it can prevent the liquid from entering above the stop plate 58. The impeller 4 uses centrifugal force to make the gas located on the lower surface of the partition plate 51. The gas enters the fixed cover 54 from the venting column 55, and the top of the venting column 55 is higher than the liquid height below the partition plate 51. This can separate the gas from the liquid inside the pump body 2, and the vacuum degree can reach the set requirements, increasing the pumping efficiency.

[0024] Please see Figure 2 , Figure 7 and Figure 8 As shown, a drainage assembly 7 is provided outside the exhaust column 56 and between the side wall of the pump body 2 and the side wall of the fixed cover 54. The drainage assembly 7 includes an annular sleeve 71, which is located below the exhaust column 56. Connecting sleeves 72 are welded to both ends of the annular sleeve 71. The interior of the connecting sleeves 72 is slidably connected to the exhaust column 56. Both connecting sleeves 72 of the annular sleeve 71 are connected to the interior of the exhaust column 56. The two connecting sleeves 72 are slidably connected along the outside of the exhaust column 56. The interior of the annular sleeve 71 is used to drain the exhaust column 56. Liquid is collected in the air column 56, allowing the liquid inside the exhaust column 56 to flow into the annular sleeve 71, and gas is discharged from the exhaust column 56. The bottom end of the annular sleeve 71 is connected to a first return pipe 74, the bottom end of which is connected to the surface of the partition plate 51. Both ends of the first return pipe 74 are connected to the annular sleeve 71 and the pump body 2. The first return pipe 74 is used to return the liquid in the exhaust column 56 and the annular sleeve 71 to the pump body 2. The liquid flows from the exhaust column 56 into the annular sleeve 71, and the liquid in the first return pipe 74 flows into the lower surface of the partition plate 51.

[0025] Please see Figure 7 and Figure 8As shown, a one-way valve 73 is provided in the middle of the annular sleeve 71. The one-way valve 73 is used for the one-way flow of liquid inside the annular sleeve 71. The one-way valve 73 is used to prevent liquid inside the pump body 2 from entering the annular sleeve 71. Liquid flows from the top of the annular sleeve 71 at the top of the first return pipe 74 into the bottom of the first return pipe 74, and the one-way valve 73 prevents liquid from flowing from inside the pump body 2 into the annular sleeve 71.

[0026] Gas is discharged from the fixed cover 54 to the outside of the pump body 2 through the exhaust column 56. If liquid inside the fixed cover 54 enters the exhaust column 56, the liquid enters the annular sleeve 71 through the two connecting sleeves 72 of the exhaust column 56. The liquid flows back from the first return pipe 74 to below the partition plate 51, and thus the liquid enters the pump body 2 through the annular sleeve 71. The one-way valve 73 can prevent the liquid from flowing back from the first return pipe 74 into the annular sleeve 71. The airflow in the fixed cover 54 is discharged from the exhaust column 56. Some liquid accumulates inside the annular sleeve 71 and flows into the pump body 2. The one-way valve 73 prevents the liquid from flowing back into the exhaust column 56, which can further separate the gas and liquid and reduce equipment wear.

[0027] Please see Figure 2 , Figure 9 - Figure 11 As shown, a return flow assembly 8 is provided inside the fixed cover 54. The return flow assembly 8 includes a floating plate 81, which is sleeved on the outside of each ventilating column 55. The floating plate 81 slides relative to each ventilating column 55 and can move up and down along the outside of each ventilating column 55. The position of the floating plate 81 can be adjusted. An expansion airbag 82 is provided outside each ventilating column 55 and below the floating plate 81. The top of the expansion airbag 82 is fixed to the floating plate 81, and one end of the expansion airbag 82 is connected to the outside of the pump body 2. An air nozzle 83 is provided at the end of the expansion airbag 82. The air nozzle 83 is used to inflate or vent gas into the expansion airbag 82. When the air nozzle 83 is opened, the expansion airbag 82 contracts to drive the floating plate 81 down. When the air nozzle 83 is inflated, the expansion airbag 82 expands to drive the floating plate 81 up.

[0028] Please see Figure 10 and Figure 11As shown, a second return pipe 85 is provided at the bottom of the floating plate 81 and at the corresponding position of each vent column 55. The second return pipe 85 is shaped like an inverted V. The bottom end of the second return pipe 85 is slidably connected to the upper end of the vent column 55. The second return pipe 85 is used to return the liquid inside the floating plate 81 to the inside of the vent column 55. Because the bottom end of the floating plate 81 has a second return pipe 85, the liquid in the floating plate 81 flows to the second return pipe 85, and the liquid in the second return pipe 85 returns to the inside of the vent column 55. A spacer sleeve 84 is provided in the middle of the fixed cover 54 and the middle of the spacer plate 51. The spacer sleeve 84 is slidably connected to the floating plate 81. Because the floating plate 81 slides along the outside of the spacer sleeve 84 when it rises and falls, the floating plate 81 is prevented from being affected by the rotating conveyor shaft 6.

[0029] Please see Figure 10 As shown, gas is injected into the expansion bladder 82, causing it to expand. The expanded expansion bladder 82 is used to move the floating plate 81 upward. Gas is injected into the expansion bladder 82 from the air nozzle 83, causing it to expand. This allows the expansion bladder 82 to lift the floating plate 81. The liquid in the floating plate 81 flows from the bottom of the second return pipe 85 into the interior of the ventilated column 55, and the accumulated liquid flows into the interior of the pump body 2.

[0030] Please see Figure 11 As shown, gas is discharged from the inside of the inflatable airbag 82, and the inside of the inflatable airbag 82 contracts. The contracted inflatable airbag 82 is used to move the floating plate 81 downward. Gas is discharged from the air nozzle 83 of the inflatable airbag 82, causing the inflatable airbag 82 to contract. Thus, the inflatable airbag 82 can drive the floating plate 81 to descend. Some of the overflowing liquid flows out from the top of the vent column 55, causing the liquid to accumulate inside the floating plate 81, which facilitates the liquid to flow back into the vent column 55 later.

[0031] It should be noted that when some liquid inside the pump body 2 also enters the fixed cover 54 from inside the vent column 55, the liquid flows into the floating plate 81 from the inner wall of the fixed cover 54. A significant amount of liquid accumulates inside the floating plate 81. Normally, air is discharged from the exhaust column 56 to the outside of the pump body 2. Pre-filling the air nozzle 83 with gas will cause the expansion bladder 82 to expand. The expansion bladder 82 causes the floating plate 81 to rise. The bottom end of the second return pipe 85 of the floating plate 81 is aligned with the top end of the vent column 55, allowing the liquid in the floating plate 81 to flow back into the vent column 55 from the second return pipe 85, thus returning the liquid to the pump body 2. Even if more liquid accumulates inside the fixed cover 54, it will not affect the return of liquid from the vent column 55 to the pump body 2. After the pump body is removed from the liquid, the air nozzle 83 can be repeatedly inflated and deflated to make the expansion air bag 82 expand or contract. At this time, not only can the liquid in the floating plate 81 be discharged from the vent column 55, but the gas in the floating plate 81 can also be discharged from the exhaust column 56. The expansion and contraction of the expansion air bag 82 makes the floating plate 81 rise and fall. A lot of liquid can accumulate in the floating plate 81, and the liquid in the floating plate 81 can be returned to the pump body 2, reducing the amount of liquid entering the floating plate 81.

[0032] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A variable frequency vacuum pump with gas-liquid separation function, comprising a variable frequency motor body (1), a pump body body (2), an impeller (4), a conveying shaft (6), and two inlets and outlets (3), wherein the variable frequency motor body (1) is connected to the impeller (4) via the conveying shaft (6), the impeller (4) is located inside the pump body body (2), and the two inlets and outlets (3) are located on the side walls of the pump body body (2), and the water flow at the two inlets and outlets (3) flows along the inner wall of the pump body body (2) under the centrifugal force of the impeller (4), characterized in that, The pump body (2) is equipped with a gas-liquid separation component (5). The gas-liquid separation component (5) includes a partition plate (51). The partition plate (51) is installed inside the pump body (2). A fixed cover (54) is welded to the surface of the partition plate (51) and outside the conveying shaft (6). An annular plate (52) is welded to the outside of the impeller (4). A ring of venting columns (55) is installed on the surface of the partition plate (51) and inside the annular plate (52). The venting columns (55) are used to send the air inside the annular plate (52) into the fixed cover (54). An exhaust column (56) is connected between the side wall of the pump body (2) and the side wall of the fixed cover (54). The exhaust column (56) is used to exhaust the air in the fixed cover (54) to the outside of the pump body (2).

2. The variable frequency vacuum pump with gas-liquid separation function according to claim 1, characterized in that, The top of the venting column (55) is higher than the position of the exhaust column (56), and the bottom of the venting column (55) is in contact with the lower surface of the partition plate (51). The top of the impeller (4) has a ring of reserved grooves (57). The reserved grooves (57) are arranged in a ring array, and the venting columns (55) are arranged in a ring array. The position of the reserved grooves (57) is adapted to the bottom of the venting column (55).

3. A variable frequency vacuum pump with gas-liquid separation function according to claim 2, characterized in that, The exhaust column (56) is a telescopic hollow tube. The elongation of the exhaust column (56) is greater than the radial distance difference between the fixed cover (54) and the pump body (2). One end of the exhaust column (56) is connected to the side wall of the fixed cover (54), and the other end of the exhaust column (56) is connected to the side wall of the pump body (2).

4. A variable frequency vacuum pump with gas-liquid separation function according to claim 3, characterized in that, A reserved opening (53) is provided at each of the top ends where the annular plate (52) and the impeller (4) intersect. The reserved opening (53) is used for airflow to enter the interior of the annular plate (52) from the outside. A flow stop plate (58) is welded to the inner wall of the annular plate (52). The flow stop plate (58) is used to prevent liquid from entering the inner wall of the annular plate (52).

5. A variable frequency vacuum pump with gas-liquid separation function according to claim 4, characterized in that, A drain assembly (7) is provided outside the exhaust column (56) and between the side wall of the pump body (2) and the side wall of the fixed cover (54). The drain assembly (7) includes an annular sleeve (71), which is located below the exhaust column (56). Both ends of the annular sleeve (71) are welded with connecting sleeves (72). The interior of the connecting sleeves (72) is slidably connected to the exhaust column (56). Both connecting sleeves (72) of the annular sleeve (71) are connected to the exhaust column (56). The internal parts are connected. The inside of the annular sleeve (71) is used to collect the liquid in the exhaust column (56). The bottom end of the annular sleeve (71) is connected to the first return pipe (74). The bottom end of the first return pipe (74) is connected to the surface of the partition plate (51). The two ends of the first return pipe (74) are connected to the inside of the annular sleeve (71) and the pump body (2). The first return pipe (74) is used to return the liquid in the exhaust column (56) and the annular sleeve (71) to the inside of the pump body (2).

6. A variable frequency vacuum pump with gas-liquid separation function according to claim 5, characterized in that, A one-way valve (73) is provided in the middle of the annular sleeve (71). The one-way valve (73) is used for the one-way flow of liquid inside the annular sleeve (71). The one-way valve (73) is used to prevent liquid inside the pump body (2) from entering the annular sleeve (71).

7. A variable frequency vacuum pump with gas-liquid separation function according to claim 6, characterized in that, The fixed cover (54) is provided with a return assembly (8), which includes a floating plate (81). The floating plate (81) is sleeved on the outside of each ventilating column (55). The floating plate (81) slides relative to each ventilating column (55). An expansion airbag (82) is provided on the outside of each ventilating column (55) and below the floating plate (81). The top of the expansion airbag (82) is fixed to the floating plate (81). One end of the expansion airbag (82) is connected to the outside of the pump body (2). An air nozzle (83) is provided at the end of the expansion airbag (82). The air nozzle (83) is used to fill the expansion airbag (82) with gas or discharge gas.

8. A variable frequency vacuum pump with gas-liquid separation function according to claim 7, characterized in that, A second return pipe (85) is provided at the bottom of the floating plate (81) and at the corresponding position of each ventilating column (55). The second return pipe (85) is shaped like an inverted V. The bottom end of the second return pipe (85) is slidably connected to the upper end of the ventilating column (55). The second return pipe (85) is used to return the liquid inside the floating plate (81) to the ventilating column (55). A spacer sleeve (84) is provided in the middle of the fixed cover (54) and the middle of the spacer plate (51). The spacer sleeve (84) is slidably connected to the floating plate (81).

9. A variable frequency vacuum pump with gas-liquid separation function according to claim 8, characterized in that, Gas is injected into the inflatable airbag (82), causing the inside of the inflatable airbag (82) to expand. The expanded inflatable airbag (82) is used to move the floating plate (81) upward.

10. A variable frequency vacuum pump with gas-liquid separation function according to claim 8, characterized in that, Gas is expelled from the inside of the inflatable airbag (82), and the inside of the inflatable airbag (82) contracts. The contracted inflatable airbag (82) is used to move the floating plate (81) downward.

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