Vacuum pump set of foundation pit deep well dewatering zone gas-water separator

Abstract

The utility model discloses a vacuum pump set of a foundation pit deep well dewatering belt gas-water separator. The vacuum pump set comprises a separator body, a mechanical vacuum pump, a water pump, a vacuum pump water tank, an electric control cabinet and a water gun. The separator body is arranged for the mechanical vacuum pump, water-gas separation is achieved, water-gas mixture entering the mechanical vacuum pump is reduced, mechanical abrasion is reduced, heating of the vacuum pump is restrained, and the service life is prolonged; the separator body has the functions of water-gas separation, cavity division and pressure balance conversion by dividing each cavity in the separator body, arranging the valves and applying the PLC to control the valves, so that the separator body has the functions of water-gas separation, cavity division and pressure balance conversion, drainage of a water pump is facilitated, the situation that an existing separation device is difficult to drain water is improved, and the separation efficiency is improved. The advantage of high water pumping efficiency of the mechanical vacuum pump is brought into full play, and continuous work of the mechanical vacuum pump is not affected by water-gas separation in a drainage link.

Description

TECHNICAL FIELD

[0001] The utility model relates to deep foundation pit dewatering technical field especially a kind of vacuum pump set of foundation pit deep well dewatering with gas-water separator. BACKGROUND

[0002] In deep foundation pit dewatering work, the vacuum pump of vacuum deep well dewatering has the following problems: the jet vacuum pump and the mechanical vacuum pump are two most commonly used water pumps, the jet vacuum pump has higher wear resistance, so it is beneficial to the extraction of water-gas mixture in the deep foundation pit dewatering process, the problem is that the jet vacuum pump has less air extraction per unit power consumption, the circulating water heats up quickly, and it is easy to run out of water, which reduces the vacuum degree after the water runs out, resulting in low water extraction efficiency or even unable to extract water from the deep well; the mechanical vacuum pump has large air extraction per unit power consumption and high water extraction efficiency, but the problem is that the mechanical vacuum pump wears out very quickly due to the sand and gravel in the water-gas mixture, which results in high maintenance costs, making it difficult to meet the extraction requirements of water-gas mixture in the deep foundation pit dewatering process; in addition, the deep foundation pit dewatering needs to work continuously for a long time, which results in overheating of the mechanical vacuum pump and makes it impossible to work continuously; in the prior art CN 115405488 A

a vacuum pump set for deep well dewatering of foundation pit with gas-water separator

[0003] The utility model aims at the deficiency of prior art and provides a vacuum pump set for deep well dewatering of foundation pit with gas-water separator, which combines the separator body, the mechanical vacuum pump and the water pump; the separator body is provided for the mechanical vacuum pump to separate water and gas in the separator body, reduce the entry of water-gas mixture into the mechanical vacuum pump and reduce mechanical wear; by changing the structure, setting and control of the water tank of the vacuum pump, the overheating problem of the mechanical vacuum pump is solved; by setting the water gun, the cleaning problem of the separator body is solved; by replacing the valve and simplifying the executive components, the automatic control of the valve by the PLC programmable controller is facilitated, so that the utility model has the characteristics of automatic water-gas separation in the cavity, pressure conversion, continuous vacuum extraction and intermittent water pump discharge, which fully utilizes the high water extraction efficiency of the mechanical vacuum pump and ensures the completion of the water drainage process of water-gas separation under the condition of continuous operation of the mechanical vacuum pump.

[0004] The technical scheme for realizing the purpose of the utility model is as follows:

[0005] A vacuum pump set of a foundation pit deep well dewatering gas-water separator, characterized by a separator body, a mechanical vacuum pump, a water pump, a vacuum pump water, an electric control cabinet and a water gun.

[0006] The separator body is in the shape of a tank, and the separator body is divided into an upper cavity and a lower cavity arranged in a vertical manner by a transverse partition plate, and the lower cavity is a second water storage cavity; the upper cavity is further divided into a water-gas separation cavity and a first water storage cavity arranged in a horizontal manner by a vertical overflow partition plate and the transverse partition plate, and the water-gas separation cavity and the first water storage cavity are in a semi-closed state; and a vacuum cavity is arranged on the top of the overflow partition plate and communicates with the vacuum cavity.

[0007] A vacuum pump suction port, a communication pipe first port and a well pipe port are arranged on the top of the separator body and communicate with the vacuum cavity; a communication pipe second port is arranged on one side of the separator body and communicates with the second water storage cavity; and a water pump port and a water gun port are arranged on the other side of the separator body and communicate with the second water storage cavity.

[0008] A water-gas sinking pipe is arranged in the water-gas separation cavity, one end of the water-gas sinking pipe is inserted into the well pipe port, and the lower end of the water-gas sinking pipe is close to the transverse partition plate and is in an open state.

[0009] The communication pipe first port and the communication pipe second port are connected through a communication pipe, and a two-position three-way valve is arranged between the two ports of the communication pipe.

[0010] A liquid level control one-way valve is arranged on the transverse partition plate between the second water storage cavity and the first water storage cavity.

[0011] A liquid level probe is arranged in the second water storage cavity from the bottom to the top.

[0012] A vacuum pump suction port, a vacuum pump exhaust port and a vacuum pump water inlet port are arranged on the mechanical vacuum pump, and a vacuum pump check valve is arranged on the vacuum pump suction port.

[0013] A water pump suction port and a water pump drainage port are arranged on the water pump, a water pump check valve is arranged on the water pump suction port, a three-way joint is arranged on the water pump drainage port, and a water pump drainage valve, a water gun control valve and a water tank water supplement valve are sequentially arranged on the three-way joint.

[0014] A water tank air inlet port, a water tank exhaust port, a water tank water supply port and a water tank water supplement port are arranged on the vacuum pump water tank, a filter screen is arranged on the water tank water supplement port, and a water full stop is arranged in the vacuum pump water tank.

[0015] The mechanical vacuum pump and the water pump are arranged on the outside of the separator body.

[0016] The vacuum pump water tank is arranged in the water-gas separation cavity of the separator body.

[0017] The water gun is arranged in the second water storage cavity of the separator body and is connected with the water gun port.

[0018] The suction port of the mechanical vacuum pump is connected with the vacuum pump suction interface of the separator body through a vacuum pump check valve, the exhaust port of the vacuum pump is connected with the water tank air inlet of the vacuum pump water tank through a pipeline, and the water inlet of the vacuum pump is connected with the water tank water supply port of the vacuum pump water tank.

[0019] The water pump suction port is connected with the water pump interface of the separator body through a water pump check valve, the water gun control valve is connected with the water gun interface of the separator body, and the water tank water supplement valve is connected with the water tank water supplement port of the vacuum pump water tank through a filter screen.

[0020] The electric control cabinet is arranged on the outside of the separator body, a PLC programmable controller is arranged in the electric control cabinet, and the PLC programmable controller is electrically connected with the mechanical vacuum pump, the water pump, the liquid level probe and the two-position three-way valve.

[0021] At least one maintenance hole is arranged on the separator body.

[0022] A vacuum gauge is arranged on the vacuum cavity of the separator body.

[0023] The vacuum pump water tank is a multi-heat dissipation surface water tank with a plurality of grooves arranged on the tank body.

[0024] The utility model discloses a technical effect is

[0025] 1) water gas separation is completed in the vacuum cavity

[0026] The utility model discloses a water gas separation cavity, first water storage cavity and second water storage cavity are arranged in the separator body, when working, water gas mixture enters water gas separation cavity, and is guided to the lower port of water gas sinking pipe by water gas sinking pipe, and is discharged from the bottom of water gas separation cavity, and water is deposited in water gas separation cavity, when the water level in water gas separation cavity crosses overflow baffle, flows into first water storage cavity, and water gas separation in the separator body is realized, at the same time, the vacuum cavity is reserved on the top of overflow baffle, is extracted by mechanical vacuum pump through the vacuum pump suction interface of vacuum cavity, and the vacuum degree of vacuum cavity is monitored through vacuum gauge, realize the vacuum cavity with water gas separation function in the separator body, prevent the phenomenon that sand and gravel in water gas mixture from entering mechanical vacuum pump in the working process of mechanical vacuum pump, and completely solve the defects, such as quick mechanical wear of vacuum pump, high maintenance cost and short service life in the working process of vacuum water in mechanical vacuum pump.

[0027] 2) the water pump is automatically intermittent drainage from the separator body

[0028] For the water pump from the separator body automatic intermittent drainage, also meet the mechanical vacuum pump to achieve the purpose of continuous work, the utility model discloses the liquid level control check valve on the transverse bulkhead between the second water storage cavity and first water storage cavity, set up the communicating pipe between the second water storage cavity and first water storage cavity, set up two position three way valve between the two interfaces of communicating pipe, when the first water storage cavity water storage, two position three way valve connects the second water storage cavity and first water storage cavity, the same vacuum state in the separator body, keep the vacuum degree of vacuum cavity,

[0029] When the second water storage cavity drainage, water pump opens, simultaneously, two position three way valve cuts off the passageway of second water storage cavity and first water storage cavity, switches to the second water storage cavity and atmosphere communication, at this time, the pressure in the second water storage cavity rises, and it is favorable for water pump to realize drainage from the separator body.

[0030] 3), for mechanical vacuum pump implements circulating water cooling

[0031] The utility model discloses the vacuum pump water tank is placed in the water gas separation cavity of separator body, utilizes the water cooling of water gas separation cavity to vacuum pump water tank, for promoting cooling efficiency, set up several recesses on the tank body of vacuum pump water tank to increase the heat dissipation surface of vacuum pump water tank, because the vacuum pump exhaust of mechanical vacuum pump and the water tank inlet pipe connection of vacuum pump water tank, the water inlet of vacuum pump and the water supply opening of vacuum pump water tank are connected, and the circulating water cooling system is formed between the vacuum pump water tank and mechanical vacuum pump, and the circulating water cooling of mechanical vacuum pump is completed, for guaranteeing the water quality in the vacuum pump water tank, the utility model sets up the filter screen on the pipeline between water tank water replenishing valve and water tank water replenishing opening.

[0032] 4), it is favorable to the pollution and cleaning of separator body

[0033] The utility model discloses the water gun in the second water storage cavity of separator body, and the water gun is connected with water gun control valve and water pump through water gun interface, is used for regularly to the pollution and cleaning of separator body. ACCURACY OF DRAWINGS

[0034] Figure 1 It is the structural schematic diagram of the utility model;

[0035] Figure 2 It is the electric control connection schematic diagram of the utility model. CONCRETE IMPLEMENTING METHOD

[0036] Referring to Figure 1 、 Figure 2 The utility model discloses a separator body 1, mechanical vacuum pump 2, water pump 3, vacuum pump water tank 4, electric control cabinet 5 and water gun 6, and the separator body 1 is provided with the water gas separation cavity 11, the vacuum cavity 12 and the second water storage cavity 13.

[0037] Referring to Figure 1The separator body 1 is in the shape of a tank body, and is divided into an upper cavity and a lower cavity arranged in a vertical direction by a horizontal partition plate 111, and the lower cavity is a second water storage cavity 112; the upper cavity is further divided into a water-gas separation cavity 114 and a first water storage cavity 115 arranged in a horizontal direction by a vertical overflow partition plate 113 and the horizontal partition plate 111, and the water-gas separation cavity 114 and the first water storage cavity 115 are in a semi-closed state; and a vacuum cavity 116 is arranged on the top of the overflow partition plate 113 and communicates with the vacuum cavity 116.

[0038] The top of the separator body 1 is provided with a vacuum pump suction interface 11, a communication pipe first interface 12 and a well pipe interface 16, which communicate with the vacuum cavity 116; one side of the separator body 1 is provided with a communication pipe second interface 13 which communicates with the second water storage cavity 112; and the other side of the separator body 1 is provided with a water pump interface 14 and a water gun interface 17 which communicate with the second water storage cavity 112.

[0039] The water-gas separation cavity 114 is provided with a water-gas sinking pipe 161, one end of which is inserted into the well pipe interface 16 and the lower end thereof is close to the horizontal partition plate 111 and is in an open state.

[0040] The communication pipe first interface 12 and the communication pipe second interface 13 are connected by a communication pipe 15, and a two-position three-way valve 151 is arranged between the two interfaces of the communication pipe 15.

[0041] A liquid level control one-way valve 121 is arranged on the horizontal partition plate 111 between the second water storage cavity 112 and the first water storage cavity 115.

[0042] A liquid level probe 122 is arranged in the second water storage cavity 112 from the bottom to the top.

[0043] Referring to Figure 1 The mechanical vacuum pump 2 is provided with a vacuum pump suction port 21, a vacuum pump exhaust port 22 and a vacuum pump water inlet 23, and the vacuum pump suction port 21 is provided with a vacuum pump check valve 24.

[0044] Referring to Figure 1 The water pump 3 is provided with a water pump water suction port 31 and a water pump water discharge port 32, the water pump water suction port 31 is provided with a water pump check valve 33, and the water pump water discharge port 32 is provided with a three-way valve, and the three-way valve is sequentially provided with a water pump water discharge valve 34, a water gun control valve 35 and a water tank water supplement valve 36.

[0045] Referring to Figure 1 The water tank 4 is provided with a water tank air inlet 41, a water tank air outlet 42, a water tank water supply port 43 and a water tank water supplement port 44, the water tank water supplement port 44 is provided with a filter screen 47, and the water tank 4 is provided with a water full stop 45.

[0046] Referring to Figure 1 The mechanical vacuum pump 2 and the water pump 3 are arranged outside the separator body 1.

[0047] The vacuum pump water tank 4 is arranged in the water-gas separation cavity 114 of the separator body 1; and the water gun 6 is arranged in the second water storage cavity 112 of the separator body 1 and connected with the water gun interface 17.

[0048] Referring to Figure 1 , the vacuum pump suction port 21 of the mechanical vacuum pump 2 is connected with the vacuum pump suction interface 11 of the separator body 1 through a vacuum pump check valve 24, the vacuum pump exhaust port 22 is connected with the water tank air inlet port 41 of the vacuum pump water tank 4 through a pipeline, and the vacuum pump water inlet port 23 is connected with the water tank water supply port 43 of the vacuum pump water tank 4.

[0049] Referring to Figure 1 , the water pump suction port 31 of the water pump 3 is connected with the water pump interface 14 of the separator body 1 through a water pump check valve 33, the water gun control valve 35 is connected with the water gun interface 17 of the separator body 1, and the water tank water supplement valve 36 is connected with the water tank water supplement port 44 of the vacuum pump water tank 4 through a filter screen 47.

[0050] Referring to Figure 1 , Figure 2 , the electric control cabinet 5 is arranged outside the separator body 1; a PLC programmable controller is arranged in the electric control cabinet 5, and the PLC programmable controller is electrically connected with the mechanical vacuum pump 2, the water pump 3, the liquid level probe 122 and the two-position three-way valve 151 respectively.

[0051] Referring to Figure 1 , at least one maintenance hole is arranged on the separator body 1.

[0052] Referring to Figure 1 , a vacuum gauge 18 is arranged on the vacuum cavity 116 of the separator body 1.

[0053] Referring to Figure 1 , the vacuum pump water tank 4 is a multi-heat-dissipation-surface water tank with a plurality of grooves 46 arranged on the tank body.

[0054] The working process of the utility model is as follows:

[0055] Referring to Figure 1 , Figure 2 , the utility model is a combination of the separator body 1, the mechanical vacuum pump 2, the water pump 3, the vacuum pump water tank 4 and the electric control cabinet 5.

[0056] The utility model forms a vacuum in the separator body 1 through the working of the mechanical vacuum pump 2, and realizes the purpose of deep foundation pit dewatering by connecting a deep well of a foundation pit with the other end of the water-gas sinking pipe 161 arranged in the water-gas separation cavity 114.

[0057] Referring to Figure 1The utility model discloses a separator body 1 setting is to protect mechanical vacuum pump 2, first, the water gas mixture of the water gas separation chamber 114 is separated to the water gas mixture of the water gas separation chamber 114 in the water gas mixture of the water gas separation chamber 114, prevents the water gas mixture and the sand gravel direct into mechanical vacuum pump 2, two, the water inlet 23 front end of mechanical vacuum pump 2 is provided with vacuum pump water tank 4, and vacuum pump water tank 4 is placed in the water gas separation chamber 114 of separator body 1, is easy to the water tank cooling, simultaneously, the water of vacuum pump water tank 4 is filtered by filter screen 47, makes the water of cooling and filtration enter mechanical vacuum pump 2 and cool circulation, both solve the problem of excessive wear of mechanical vacuum pump, and solve the heating problem of the continuous work of mechanical vacuum pump 2.

[0058] Referring to Figure 1 , when working, the separator body 1 is in a vacuum state, which is not conducive to the drainage of the water pump 3. To facilitate the drainage of the separator body 1, the utility model discloses a transverse partition plate 111 arranged in the separator body 1, which divides the separator body 1 into an upper cavity and a lower cavity arranged in a top-bottom manner. The lower cavity is a second water storage cavity 112. A communication pipe first interface 12 is arranged in the upper cavity, and a communication pipe second interface 13 is arranged in the lower cavity. The first interface 12 and the second interface 13 are connected by a communication pipe 15, and a two-position three-way valve 151 is arranged between the two interfaces of the communication pipe 15. By switching the two-position three-way valve 151, the upper cavity and the lower cavity are connected or disconnected, and the lower cavity is connected to the atmosphere. When the water pump 3 is not draining, the upper cavity and the lower cavity are connected by switching the two-position three-way valve 151, and are in the same vacuum state, so that the mechanical vacuum pump 2 works normally. When the water pump 3 is draining, the upper cavity and the lower cavity are disconnected, the lower cavity is connected to the atmosphere, the pressure in the second water storage cavity 112 of the lower cavity increases, which is conducive to drainage, and the upper cavity is still in a vacuum state, so that the mechanical vacuum pump 2 continues to work normally, and the drainage is completed. The two-position three-way valve 151 is switched, and the cycle is repeated. Embodiment

[0059] Mechanical vacuum pump continuous water pumping and water pump intermittent drainage process

[0060] Referring to Figure 1 , Figure 2 , the mechanical vacuum pump 2 is started by the PLC programmable controller of the electric control cabinet 5. The vacuum pump check valve 24 is automatically opened, and the two-position three-way valve 151 is switched to connect the upper cavity and the lower cavity. The pressure in the separator body 1 is reduced, the water and the water gas mixture sucked by the water pumping pipe in the deep well of the foundation pit flow through the water gas sinking pipe 161 to the water gas separation chamber 114, and the water gas separation is implemented. The water is deposited in the water gas separation chamber 114, and the gas is sucked out by the mechanical vacuum pump 2 through the vacuum pump suction interface 11 of the vacuum chamber 116. The separator body 1 is in a vacuum state, and the mechanical vacuum pump 2 sucks the water and the water gas mixture in the deep well of the foundation pit through the water pumping pipe.

[0061] Referring to Figure 1 、 Figure 2 , with the water level in the water-gas separation chamber 114 increasing, the water level exceeds the overflow partition plate 113 and flows into the first water storage chamber 115. When the water storage in the first water storage chamber 115 reaches a set upper limit, at this time, the liquid level control one-way valve 121 is opened, and the water in the first water storage chamber 115 flows into the second water storage chamber 112 through the liquid level control one-way valve 121, and the water discharge from the first water storage chamber 115 to the second water storage chamber 112 starts.

[0062] Referring to Figure 1 、 Figure 2 , with the water level in the second water storage chamber 112 increasing, when the water level reaches a set upper limit, the upper limit contact of the liquid level probe 122 in the second water storage chamber 112 is touched, the liquid level probe 122 triggers the PLC programmable controller at the upper limit position, the water pump 3 is opened, and the two-position three-way valve 151 is switched to disconnect the upper chamber body from the lower chamber body and connect the lower chamber body with the atmosphere. Since the two-position three-way valve 151 is connected with the atmosphere, the pressure in the second water storage chamber 112 starts to increase, which is convenient for the water pump 3 to pump the water in the second water storage chamber 112. The water in the second water storage chamber 112 is discharged through the water pump check valve 33, the water pump drainage port 32 and the water pump drainage valve 34.

[0063] Referring to Figure 1 、 Figure 2 , when the water in the first water storage chamber 115 is discharged to a set lower limit, the liquid level control one-way valve 121 is automatically closed, and the water discharge from the first water storage chamber 115 to the second water storage chamber 112 is completed. Since the liquid level control one-way valve 121 is arranged on the horizontal partition plate 111 between the second water storage chamber 112 and the first water storage chamber 115, the water gas in the second water storage chamber 112 cannot flow back into the first water storage chamber 115.

[0064] Referring to Figure 1 、 Figure 2 , when the water level in the second water storage chamber 112 reaches a set lower limit, the lower limit contact of the liquid level probe 122 in the second water storage chamber 112 is touched, the liquid level probe 122 triggers the PLC programmable controller at the lower limit position, the water pump 3 is closed, and the two-position three-way valve 151 is switched to connect the upper chamber body with the lower chamber body, i.e. to disconnect the lower chamber body from the atmosphere. The above process is repeated to realize the intermittent water discharge of the water pump 3 and the continuous pumping of the water and water gas mixture in the deep well of the foundation pit by the water pump 3 and the mechanical vacuum pump 2.

[0065] Referring to Figure 1 、 Figure 2 , in order to facilitate the flow of gas between the upper chamber body and the lower chamber body, the utility model discloses a communication pipe 15 which is provided with a first interface 12 and a second interface 13. The first interface 12 is arranged above the first water storage chamber 115, and the second interface 13 is arranged above the second water storage chamber 112. Embodiment

[0066] Process for implementing circulating water cooling on mechanical vacuum pump

[0067] Referring to Figure 1 , Figure 2 Since the vacuum pump exhaust port 22 of the mechanical vacuum pump 2 is connected with the water tank air inlet port 41 of the water tank 4, the water inlet port 23 of the mechanical vacuum pump 2 is connected with the water tank water supply port 43 of the water tank 4, and the water tank 4 is connected with the mechanical vacuum pump 2, a circulating water cooling system is formed between the water tank 4 and the mechanical vacuum pump 2, and the circulating water cooling on the mechanical vacuum pump is completed.

[0068] In order to reduce the temperature of the circulating water, the water tank 4 is arranged in the water-air separation cavity 114 of the separator body 1, and the water in the water-air separation cavity 114 is used to cool the water tank 4. In order to improve the cooling efficiency, a plurality of grooves 46 are arranged on the tank body of the water tank 4, so as to increase the heat dissipation surface of the water tank 4, and the heating problem of the mechanical vacuum pump 2 during continuous working is solved.

[0069] In order to ensure the water quality in the water tank 4, a filter screen 47 is arranged on the pipeline between the water tank water replenishing valve 36 and the water tank water replenishing port 44.

[0070] In order to ensure the water level in the water tank 4, the opening degree of the water tank water replenishing valve 36 is manually adjusted. During the water discharge of the water pump 3, the water discharged by the water pump 3 is replenished to the water tank 4 through the water tank water replenishing valve 36, the filter screen 47 and the water tank water replenishing port 44. Meanwhile, a water full stop 45 is arranged in the water tank 4, and the water replenishing is stopped when the water level reaches the set position. Embodiment

[0071] Process for cleaning the separator body

[0072] Referring to ​ , ​ During the deep well dewatering of the foundation pit, the equipment needs to be maintained regularly, and the separator body 1 needs to be cleaned. During the cleaning, the mechanical vacuum pump 2 stops working, the water level in the second water storage cavity 112 is kept at the height required by the cleaning, the water pump water discharge valve 34 and the water tank water replenishing valve 36 are manually closed, the water gun control valve 35 is manually opened, and then the water pump 3 is started. The water pump 3 extracts the water in the second water storage cavity 112, and then the water is sprayed into the second water storage cavity 112 through the water gun 6, the water pump water discharge port 32 and the water gun control valve 35, so as to impact the sediments in the second water storage cavity 112. After the impact is completed, the water gun control valve 35 is closed, and the water pump water discharge valve 34 is opened to discharge the water in the second water storage cavity 112, so as to complete the cleaning of the separator body 1.

Claims

1. A vacuum pump set with a gas-water separator for foundation pit deep well dewatering, characterized in that: It includes a separator body (1), a mechanical vacuum pump (2), a water pump (3), a vacuum pump water tank (4), an electric control cabinet (5) and a water gun (6); The separator body (1) is in the shape of a tank. The separator body (1) is divided into an upper cavity and a lower cavity arranged in the upper and lower parts by a transverse partition (111). The lower cavity is a second water storage cavity (112). The upper cavity is further divided into a water-gas separation cavity (114) and a first water storage cavity (115) arranged in the left and right parts by a vertical overflow partition (113) and the transverse partition (111). The water-gas separation cavity (114) and the first water storage cavity (115) are semi-enclosed. A vacuum cavity (116) that is interconnected is provided on the top of the overflow partition (113). The top of the separator body (1) is connected to the vacuum chamber (116) and is provided with a vacuum pump suction interface (11), a first connecting pipe interface (12) and a well pipe interface (16); one side of the separator body (1) is connected to the second water storage chamber (112) and is provided with a second connecting pipe interface (13); the other side of the separator body (1) is connected to the second water storage chamber (112) and is provided with a water pump interface (14) and a water gun interface (17); A water-gas sinking pipe (161) is provided in the water-gas separation chamber (114), one end of the water-gas sinking pipe (161) is inserted through the well pipe interface (16), and the lower end of the water-gas sinking pipe (161) is close to the transverse partition (111) and is in an open state; The first interface (12) of the connecting pipe is connected to the second interface (13) of the connecting pipe via a connecting pipe (15), and a two-position three-way valve (151) is provided between the two interfaces of the connecting pipe (15); A liquid level control one-way valve (121) is provided on the diaphragm (111) between the second water storage chamber (112) and the first water storage chamber (115); A liquid level probe (122) is provided in the second water storage chamber (112) from the bottom to the top; The mechanical vacuum pump (2) is provided with a vacuum pump air intake (21), a vacuum pump air exhaust (22) and a vacuum pump water inlet (23); the vacuum pump air intake (21) is provided with a vacuum pump check valve (24); The water pump (3) is provided with a water pump water inlet (31) and a water pump discharge outlet (32); the water pump water inlet (31) is provided with a water pump check valve (33); the water pump discharge outlet (32) is provided with a three-way valve, and the three-way valve is provided with a water pump discharge valve (34), a water gun control valve (35) and a water tank water supply valve (36) in sequence; The vacuum pump water tank (4) is provided with a water tank air inlet (41), a water tank exhaust port (42), a water tank water supply port (43) and a water tank water replenishment port (44); a filter (47) is provided on the water tank water replenishment port (44); and a water full stop (45) is provided in the vacuum pump water tank (4); The mechanical vacuum pump (2) and the water pump (3) are arranged outside the separator body (1); The vacuum pump water tank (4) is arranged in the water-gas separation chamber (114) of the separator body (1); The water gun (6) is arranged in the second water storage chamber (112) of the separator body (1) and is connected to the water gun interface (17); The vacuum pump air intake port (21) of the mechanical vacuum pump (2) is connected to the vacuum pump air intake interface (11) of the separator body (1) through a vacuum pump check valve (24); the vacuum pump air outlet (22) is connected to the water tank air inlet (41) of the vacuum pump water tank (4) through a pipeline; and the vacuum pump water inlet (23) is connected to the water tank water supply port (43) of the vacuum pump water tank (4); The water pump suction port (31) of the water pump (3) is connected to the water pump interface (14) of the separator body (1) via a water pump check valve (33), the water gun control valve (35) is connected to the water gun interface (17) of the separator body (1), and the water tank water supply valve (36) is connected to the water tank water supply port (44) of the vacuum pump water tank (4) via a filter (47); The electric control cabinet (5) is arranged outside the separator body (1); a PLC programmable controller is arranged inside the electric control cabinet (5), and the PLC programmable controller is electrically connected to the mechanical vacuum pump (2), the water pump (3), the liquid level probe (122) and the two-position three-way valve (151).

2. A vacuum pump unit with a gas-water separator for foundation pit deep well dewatering according to claim 1, characterized in that: The separator body (1) is provided with at least one maintenance hole.

3. The vacuum pump unit with air-water separator for foundation pit deep well dewatering according to claim 1, characterized in that: A vacuum gauge (18) is provided on the vacuum chamber (116) of the separator body (1).

4. The vacuum pump unit with air-water separator for foundation pit deep well dewatering according to claim 1, characterized in that: The vacuum pump water tank (4) is a multi-heat dissipation surface water tank with a plurality of grooves (46) provided on the box body.

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