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

Abstract

The invention discloses a vacuum pump group with a gas-water separator for deep well dewatering in foundation pits, comprising a separator body, a mechanical vacuum pump, a water pump, a vacuum pump water tank and an electric control cabinet. The invention equips the mechanical vacuum pump with a separator body to realize water-gas separation, reduce the water-gas mixture from entering the mechanical vacuum pump, reduce mechanical wear and extend the service life. By dividing the cavities in the separator body and setting valves, and using a PLC programmable controller to control the valves, the separator body has the functions of water-gas separation, cavity division and pressure balance conversion, which is convenient for the discharge of the water pump and improves the situation of the existing separation device having difficulty in draining water, so as to give full play to the advantage of the high water pumping efficiency of the mechanical vacuum pump and ensure that the water-gas separation does not affect the continuous operation of the mechanical vacuum pump in the drainage link.

Description

Technical Field

[0001] The invention relates to the technical field of deep foundation pit dewatering, in particular to a vacuum pump group with a gas-water separator for foundation pit deep well dewatering. Background Art

[0002] In the deep foundation pit dewatering work, the application of vacuum pumps in vacuum deep well dewatering has the following problems: jet vacuum pumps and mechanical vacuum pumps are the two most commonly used water pumps. Jet vacuum pumps have high wear resistance, so they are beneficial to the extraction of water-gas mixtures during deep foundation pit dewatering. The problem is that the jet vacuum pump has a small amount of air pumped per unit power consumption, the circulating water heats up quickly, and it is easy to lack water. After lack of water, the vacuum degree decreases, resulting in low water pumping efficiency and even inability to pump out water in the deep well; the mechanical vacuum pump has a large amount of air pumped per unit power consumption and high water pumping efficiency, but the problem is that due to the presence of sand and gravel in the water-gas mixture, the mechanical wear is particularly fast and the maintenance cost is particularly high, making it difficult to meet the extraction of water-gas mixtures during deep foundation pit dewatering. If a water-gas separation device is set at the front end of the mechanical vacuum pump, the mechanical wear can be reduced, but the separation device is difficult to drain under a vacuum state, resulting in the embarrassing situation that the mechanical vacuum pump cannot work continuously. How to design a vacuum pump group that can give full play to the advantages of the high pumping efficiency of the mechanical vacuum pump, reduce mechanical wear and extend the service life of the mechanical vacuum pump, while ensuring that the drainage link of water-gas separation does not affect the continuous operation of the mechanical vacuum pump, will be the key to improving the efficiency of deep foundation pit dewatering. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum pump group with a gas-water separator for deep well dewatering in foundation pits in view of the deficiencies in the prior art. The present invention adopts a combination of a separator body, a mechanical vacuum pump and a water pump. By equipping the mechanical vacuum pump with a separator body, water and gas in the separator body are separated, and the water-gas mixture entering the mechanical vacuum pump is reduced, thereby reducing mechanical wear. By dividing the cavities of the separator body and setting valves, and applying a PLC programmable controller to automatically control the valves, the separator body has the characteristics of water-gas separation in the cavity, pressure conversion and convenient water pump discharge, thereby improving the situation of drainage difficulties in existing separation devices, giving full play to the advantage of high water pumping efficiency of the mechanical vacuum pump, and ensuring that the drainage link of water-gas separation is completed under the continuous working state of the mechanical vacuum pump.

[0004] The specific technical solution for achieving the purpose of the present invention is:

[0005] A vacuum pump set with a gas-water separator for foundation pit deep well dewatering, which features a separator body, a mechanical vacuum pump, a water pump, a vacuum pump water tank and an electric control cabinet;

[0006] The separator body is in the shape of a tank body, which is divided into an upper cavity and a lower cavity arranged up and down by a transverse partition, and the lower cavity is a second water storage cavity; the upper cavity is further divided into a semi-enclosed water-gas separation cavity and a first water storage cavity arranged on the left and right by a vertical overflow partition, and the water-gas separation cavity and the first water storage cavity are provided with mutually interpenetrating vacuum cavities at the top of the overflow partition;

[0007] The top of the tank body is connected to the vacuum chamber and is provided with a vacuum pump air inlet interface and a first connecting pipe interface; the side wall of the tank body is connected to the upper part of the water-gas separation chamber and is provided with a well pipe interface; the side wall of the tank body is connected to the upper part of the second water storage chamber and is respectively provided with a connecting pipe second interface and an air inlet valve interface; and the lower part of the second water storage chamber is connected to a water pump interface;

[0008] A water vapor sinking pipe is provided in the water vapor separation chamber, the upper end of the water vapor sinking pipe is connected to the well pipe interface, and the lower end of the water vapor sinking pipe is close to the diaphragm and is open;

[0009] The first interface of the connecting pipe is connected to the second interface of the connecting pipe through the connecting pipe, and a connecting switch valve is arranged therebetween;

[0010] A drain valve is provided on the diaphragm between the second water storage chamber and the first water storage chamber;

[0011] A float switch is provided in the second water storage chamber from the bottom to the top;

[0012] The intake valve interface is provided with an intake valve;

[0013] The mechanical vacuum pump is provided with a vacuum pump air intake port, a vacuum pump air exhaust port and a vacuum pump water inlet, and the vacuum pump air intake port is provided with a vacuum pump check valve;

[0014] The water pump is provided with a water pump suction port and a water pump discharge port, and the water pump suction port is provided with a water pump check valve;

[0015] The vacuum pump water tank is provided with a water tank air inlet, a water tank exhaust port and a water tank water supply port;

[0016] The mechanical vacuum pump, water pump and vacuum pump water tank are arranged outside the separator body;

[0017] The vacuum pump air intake port of the mechanical vacuum pump is connected to the vacuum pump air inlet interface pipeline of the separator body, the vacuum pump exhaust port is connected to the water tank air inlet pipeline of the vacuum pump water tank, and the vacuum pump water inlet is connected to the water tank water supply port of the vacuum pump water tank;

[0018] The water pump water suction port of the water pump is connected to the water pump interface of the separator body;

[0019] The electric control cabinet is arranged outside the separator body; a PLC programmable controller is arranged inside the electric control cabinet, and the PLC programmable controller is electrically connected with the mechanical vacuum pump, the water pump, the drain valve, the float switch, the connecting switch valve and the air intake valve respectively.

[0020] The tank body of the separator is provided with at least one maintenance hole.

[0021] A vacuum gauge is provided on the vacuum chamber of the separator body.

[0022] The technical effects produced by the present invention are:

[0023] 1) Water and gas separation

[0024] The present invention provides a water-gas separation chamber, a first water storage chamber and a second water storage chamber in a separator body; when working, a water-gas mixture enters the water-gas separation chamber, and is guided by a water-gas sinking pipe to the lower end of the water-gas sinking pipe, that is, discharged from the bottom of the water-gas separation chamber, and water is deposited in the water-gas separation chamber. The water level in the water-gas separation chamber exceeds an overflow baffle, flows into the first water storage chamber, and flows from the first water storage chamber into the second water storage chamber through a drain valve. Gas overflows from the liquid surface and is pumped out by a mechanical vacuum pump through the vacuum pump air inlet interface of the vacuum chamber. The vacuum degree is monitored by a vacuum gauge to implement water-gas separation.

[0025] 2) The water pump discharges water intermittently from the separator body

[0026] In order to facilitate the intermittent drainage of water from the separator body by the water pump and to meet the purpose of continuous operation of the mechanical vacuum pump, the present invention provides a drain valve on the diaphragm between the second water storage chamber and the first water storage chamber; so that the lower cavity and the upper cavity of the separator body divided by the diaphragm are divided into chambers with different internal cavity pressures, and the atmosphere is connected by closing or opening the air intake valve on the air intake valve interface to realize the change of the pressure in the second water storage chamber, which is beneficial for the water pump to drain water from the separator body.

[0027] The water level drives the float switch in the second water storage chamber to rise or fall, and the float switch triggers the PLC programmable controller to work at the upper limit or lower limit, so that the water pump can automatically and intermittently drain water from the separator body.

[0028] 3) Buffer the impact on the water storage chamber during pressure conversion

[0029] When the air inlet valve is opened, the increase and sudden change of the pressure in the second water storage chamber will cause impact on the equipment. In order to buffer the impact caused by the pressure conversion of the lower chamber and facilitate the smooth operation of the present invention, a first connecting pipe interface is provided at the top of the tank body that is connected to the vacuum chamber, and a second connecting pipe interface is provided above the second water storage chamber. The first connecting pipe interface and the second connecting pipe interface are connected via the connecting pipe, and a connecting switch valve is provided therebetween. The PLC programmable controller is used to control the opening and closing sequence and opening time of the air inlet valve, the connecting switch valve and the drain valve in turn, balance the pressure difference between the first water storage chamber and the second water storage chamber when the air inlet valve is closed or opened and the drain valve is opened or closed, and reduce the pressure impact on the separator body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the electrical control connection of the present invention. DETAILED DESCRIPTION

[0032] See also Figure 1 , Figure 2 The present invention includes a separator body 1, a mechanical vacuum pump 2, a water pump 3, a vacuum pump water tank 4 and an electric control cabinet 5.

[0033] See also Figure 1 , Figure 2 The separator body 1 is in the shape of a tank, which is divided into an upper cavity and a lower cavity by a transverse partition 111, and the lower cavity is a second water storage cavity 112; the upper cavity is further divided into a semi-enclosed water-gas separation cavity 114 and a first water storage cavity 115 arranged on the left and right by a vertical overflow partition 113, and the water-gas separation cavity 114 and the first water storage cavity 115 are provided with a mutually interpenetrating vacuum cavity 116 at the top of the overflow partition 113;

[0034] The top of the tank is connected to the vacuum chamber 116 and is provided with a vacuum pump air inlet interface 11 and a first connecting pipe interface 12;

[0035] A well pipe interface 16 is provided on the side wall of the tank body in communication with the upper part of the water-gas separation chamber 114, a second connecting pipe interface 13 and an air inlet valve interface 15 are provided on the side wall of the tank body in communication with the upper part of the second water storage chamber 112, and a water pump interface 14 is provided in communication with the lower part of the second water storage chamber 112;

[0036] A water vapor sinking pipe 161 is provided in the water vapor separation chamber 114 , the upper end of the water vapor sinking pipe 161 is connected to the well pipe interface 16 , and the lower end of the water vapor sinking pipe 161 is close to the diaphragm 111 and is open.

[0037] See also Figure 1 , Figure 2The first connecting pipe interface 12 and the second connecting pipe interface 13 are connected via a connecting pipe, and a connecting switch valve 123 is provided therebetween;

[0038] A drain valve 121 is provided on the diaphragm 111 between the second water storage chamber 112 and the first water storage chamber 115;

[0039] A float switch 122 is provided in the second water storage chamber 112 from the bottom to the top;

[0040] The air intake valve interface 15 is provided with an air intake valve 151;

[0041] The mechanical vacuum pump 2 is provided with a vacuum pump air intake port 21, a vacuum pump air exhaust port 22 and a vacuum pump water inlet 23, and the vacuum pump air intake port 21 is provided with a vacuum pump check valve 24;

[0042] The water pump 3 is provided with a water pump water inlet 31 and a water pump water outlet 32, and the water pump water inlet 31 is provided with a water pump check valve 33;

[0043] The vacuum pump water tank 4 is provided with a water tank air inlet 41, a water tank exhaust port 42 and a water tank water supply port 43;

[0044] The mechanical vacuum pump 2, water pump 3 and vacuum pump water tank 4 are arranged outside the separator body 1;

[0045] The vacuum pump air intake port 21 of the mechanical vacuum pump 2 is connected to the vacuum pump air inlet interface 11 of the separator body 1 through a pipeline, the vacuum pump air exhaust port 22 is connected to 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 to the water tank water supply port 43 of the vacuum pump water tank 4;

[0046] The water pump water suction port 31 of the water pump 3 is connected to the water pump interface 14 of the separator body 1 .

[0047] See also Figure 1 , Figure 2 The electric control cabinet 5 is arranged on the outside of the separator body 1; a PLC programmable controller is arranged in the electric control cabinet 5, and the PLC programmable controller is electrically connected to the mechanical vacuum pump 2, the water pump 3, the drain valve 121, the float switch 122, the connecting switch valve 123 and the air intake valve 151 respectively.

[0048] The tank of the separator body 1 is provided with at least one maintenance hole for easy maintenance and cleaning.

[0049] A vacuum gauge is provided on the vacuum chamber 116 of the separator body 1 .

[0050] Working process of the present invention:

[0051] See also Figure 1 , Figure 2In order to facilitate the drainage of the separator body 1 and to meet the purpose of continuous operation of the mechanical vacuum pump 2, the present invention sets a water-gas separation chamber 114, a first water storage chamber 115 and a second water storage chamber 112 in the separator body 1; when working, the water-gas mixture enters the water-gas separation chamber 114 to implement water-gas separation, the gas is pumped out by the mechanical vacuum pump 2, and the water then enters the second water storage chamber 112 from the first water storage chamber 115, and is discharged from the second water storage chamber 112 by the water pump 3. In order to facilitate the discharge of the water pump 3, when draining, the second water storage chamber 112 is disconnected from the first water storage chamber 115 through the drain valve 121, the connecting switch valve 123 is closed, and the second water storage chamber 112 is connected to the atmosphere through the air intake valve 151. At this time, the first water storage chamber 115 continues to store water. After the water pump 3 discharges the water in the second water storage chamber 112, the air intake valve 151 is closed, and the first water storage chamber 115 is connected to the second water storage chamber 112 again, and the cycle is repeated. Example

[0052] See also Figure 1 , connect the well pipe interface 16 of the present invention to the water pumping pipe of the deep well of the foundation pit; supply water from the water tank water supply port 43 of the vacuum pump water tank 4 to the vacuum pump water inlet 23 of the mechanical vacuum pump 2;

[0053] See also Figure 1 , Figure 2 , controlled by the PLC programmable controller of the electric control cabinet 5, the air intake valve 151 on the air intake valve interface 15 is closed in sequence, the connecting switch valve 123 between the first connecting pipe interface 12 and the second connecting pipe interface 13 is opened, and the drain valve 121 on the diaphragm 111 is opened; at the same time, the water pump 3 is turned off, and the water pump check valve 33 is automatically closed.

[0054] See also Figure 1 , Figure 2 , turn on the mechanical vacuum pump 2, the vacuum pump check valve 24 opens automatically, the pressure in the separator body 1 begins to be reduced, and the water-gas mixture sucked by the water pump in the deep well of the foundation pit flows from the well pipe interface 16 through the water-gas sinking pipe 161 to the water-gas separation chamber 114, implementing water-gas separation, wherein water is deposited in the water-gas separation chamber 114, and the gas is extracted by the mechanical vacuum pump 2 through the vacuum pump air inlet interface 11 of the vacuum chamber 116.

[0055] See also Figure 1 , Figure 2As the water level in the water-gas separation chamber 114 increases, the water level passes over the overflow baffle 113, flows into the first water storage chamber 115, and flows into the second water storage chamber 112 from the first water storage chamber 115 through the drain valve 121; as the water level in the second water storage chamber 112 increases, the water level drives the float switch 122 in the second water storage chamber 112 to rise. When the water level in the second water storage chamber 112 reaches the set upper limit, the float switch 122 triggers the PLC programmable controller to work at the upper limit, and sequentially closes the drain valve 121, closes the connecting switch valve 123, and opens the air intake valve 151 on the air intake valve interface 15; at the same time, the water pump 3 is turned on, and the water pump check valve 33 opens automatically;

[0056] Since the air inlet valve 151 is connected to the atmosphere, the pressure in the second water storage chamber 112 begins to increase, making it easier for the water pump 3 to discharge the water in the second water storage chamber 112 .

[0057] See also Figure 1 , Figure 2 During this period, the mechanical vacuum pump 2 continues to work, and the water-gas mixture continues to flow to the water-gas separation chamber 114. The water flows from the water-gas separation chamber 114 over the overflow partition 113 into the first water storage chamber 115 for water storage; the water in the second water storage chamber 112 is discharged with the water pump 3. When the water level in the second water storage chamber 112 reaches the set lower limit, the float switch 122 triggers the PLC programmable controller to work at the lower limit, and sequentially closes the air intake valve 151 on the air intake valve interface 15, opens the connecting switch valve 123 and opens the drain valve 121; at the same time, the water pump 3 is turned off, and the water pump check valve 33 closes automatically; the water stored in the first water storage chamber 115 flows from the first water storage chamber 115 to the second water storage chamber 112 through the drain valve 121 again, and this cycle is repeated, and the mechanical vacuum pump 2 is always in a continuous normal working state.

Claims

1. A vacuum pump set with a gas-water separator for foundation pit deep well dewatering, characterized in that: It comprises a separator body (1), a mechanical vacuum pump (2), a water pump (3), a vacuum pump water tank (4) and an electric control cabinet (5); The separator body (1) is in the shape of a tank, and is divided into an upper cavity and a lower cavity arranged in the upper and lower parts by a transverse partition (111), and the lower cavity is a second water storage cavity (112); the upper cavity is further divided into a semi-enclosed 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 water-gas separation cavity (114) and the first water storage cavity (115) are provided with a mutually interpenetrating vacuum cavity (116) at the top of the overflow partition (113); The top of the tank body is connected to the vacuum chamber (116) and is provided with a vacuum pump air inlet interface (11) and a first connecting pipe interface (12); the side wall of the tank body is connected to the upper part of the water-gas separation chamber (114) and is provided with a well pipe interface (16); the side wall of the tank body is connected to the upper part of the second water storage chamber (112) and is respectively provided with a second connecting pipe interface (13) and an air inlet valve interface (15); and the lower part of the second water storage chamber (112) is connected to a water pump interface (14); A water vapor sinking pipe (161) is provided in the water vapor separation chamber (114), the upper end of the water vapor sinking pipe (161) is connected to the well pipe interface (16), and the lower end of the water vapor sinking pipe (161) is close to the transverse partition (111) and is open; The first connection port (12) of the connecting pipe is connected to the second connection port (13) of the connecting pipe via the connecting pipe, and a connecting switch valve (123) is provided therebetween; A drain valve (121) is provided on the transverse partition (111) between the second water storage chamber (112) and the first water storage chamber (115); A float switch (122) is provided in the second water storage chamber (112) from the bottom to the top; The intake valve interface (15) is provided with an intake valve (151); The mechanical vacuum pump (2) is provided with a vacuum pump air intake port (21), a vacuum pump air exhaust port (22) and a vacuum pump water inlet (23); the vacuum pump air intake port (21) is provided with a vacuum pump check valve (24); The water pump (3) is provided with a water pump water intake port (31) and a water pump water discharge port (32), and the water pump water intake port (31) is provided with a water pump check valve (33); The vacuum pump water tank (4) is provided with a water tank air inlet (41), a water tank air outlet (42) and a water tank water supply port (43); The mechanical vacuum pump (2), the water pump (3) and the vacuum pump water tank (4) are arranged outside the separator body (1); 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 pipeline, the vacuum pump air exhaust port (22) is connected to the water tank air intake port (41) of the vacuum pump water tank (4) through a pipeline, and the vacuum pump water intake port (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); The electric control cabinet (5) is arranged outside the separator body (1); a PLC programmable controller is arranged inside the electric control cabinet (5); the PLC programmable controller is electrically connected to the mechanical vacuum pump (2), the water pump (3), the drain valve (121), the float switch (122), the communication switch valve (123) and the air intake valve (151) respectively; wherein: The tank body of the separator body (1) is provided with at least one maintenance hole; A vacuum gauge is provided on the vacuum chamber (116) of the separator body (1).

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