CN220238218U - Pneumatic liquid-gas separation equipment - Google Patents

Abstract

The utility model discloses pneumatic liquid-gas separation equipment, which belongs to the technical field of engineering dewatering and vacuum preloading, and particularly comprises a separator and a pipeline connection and control system; the separator comprises a tank body, an upper cavity and a lower cavity are arranged in the tank body, the upper cavity and the lower cavity are communicated through a circular tube with a one-way valve a installed in the middle section, a gas-liquid inlet and a gas outlet b are formed in two sides of the upper cavity, and a gas inlet and a gas outlet a are formed in two sides of the lower cavity. According to the utility model, through improving the structure of the existing separator tank body and matching with the designed pipeline connection and control system, the traditional water pump drainage can be replaced by a pressurized drainage mode while the pumping and drainage work is not stopped, so that the safety is higher, the drainage efficiency is higher, the energy consumption is lower, a positive pressure source device can be shared by pipe network construction, the energy is saved, the environment is protected, and the failure rate is lower.

Description

Pneumatic liquid-gas separation equipment

Technical Field

The utility model belongs to the technical field of engineering dewatering and vacuum preloading, and particularly relates to pneumatic liquid-gas separation equipment.

Background

In engineering dewatering construction and vacuum preloading construction, the adopted vacuum pumping technology is that a vacuum pump directly pumps liquid and gas, such as overlarge water quantity, not only affects pumping effect, but also causes overload operation of a vacuum pump motor and is easy to burn out the motor.

In reality, engineering precipitation and vacuum preloading drainage construction are wide due to the coverage of the range. In engineering dewatering, a large number of well points are connected with vacuum pumping, and in order to save energy consumption and not delay engineering progress, the vacuum pumping is usually in an uninterrupted continuous operation mode; vacuum preloading pumping is a continuous operation mode which is required to be carried out continuously for a plurality of months under the condition of maintaining a certain vacuum degree.

However, the liquid-gas separator used in engineering dewatering and vacuum preloading basically adopts a single-chamber structural design, and is additionally provided with a forced-discharge mechanism (pump), and the forced-discharge mechanism is generally arranged in a chamber, so that the liquid-gas separation process of the structure has the following defects:

1. potential safety hazard: the separator is internally provided with high-voltage electric intervention (the forced drainage mechanism is positioned in the separator), and if the lead and the drainage pump in the separator are damaged, electric leakage is caused, and electric leakage accidents are easy to occur; and the foundation treatment field area is large, a plurality of devices generally work together, one device needs to erect one high-voltage line, other mechanical construction is affected, and potential safety hazards are increased.

2. Poor drainage efficiency: because the vacuum pumping and discharging need to run continuously, the water in the separator is strongly discharged in the negative pressure environment when being discharged, the water discharging effect is often not affected by the negative pressure, the rated parameters (such as the lift, the flow and the like) of the equipment are not reached, even the phenomenon of no water discharging (the water discharging pump idles) can occur, the vacuum pumping and discharging needs to be manually cut off, the negative pressure value in the separator is reduced, the water discharging of the pump needs to be manually attended, and the cost is high.

3. The energy is not saved: in order to avoid the phenomenon of idle running of the drainage pump in a negative pressure environment, a strong drainage pump with larger power is generally adopted, and a sewage pump with 5.5-7.5Kw power is generally adopted, so that the energy consumption is high.

Therefore, a novel pneumatic liquid-gas separation device for vacuum pumping is designed.

Disclosure of Invention

The utility model aims to provide pneumatic liquid-gas separation equipment which is used for solving the problems in the prior art.

The technical scheme is as follows:

the utility model discloses pneumatic liquid-gas separation equipment, which comprises a separator and a pipeline connection and control system; the pipeline connection and control system is arranged outside the separator, wherein the pipeline connection and control system further comprises a control box, a positive pressure pipeline system, a negative pressure pipeline system and an air storage tank.

Further, the separator comprises a tank body, an upper cavity and a lower cavity are separated from the inside of the tank body through a blind plate, a round pipe which is used for communicating the upper cavity with the lower cavity is vertically arranged in the middle of the blind plate in the direction of the lower cavity, a one-way valve a is arranged in the middle of the round pipe, the direction of allowing medium to circulate is from the upper cavity to the lower cavity, a gas-liquid inlet and a gas outlet b are respectively arranged on two sides, close to the top, of the upper cavity, and a gas inlet and a gas outlet a are respectively arranged on two sides, close to the top, of the lower cavity.

Further, a drain outlet and a drain pipe are respectively arranged at the center of the bottom of the lower cavity and on the side surface close to the bottom, a one-way valve b is arranged in the middle section of the drain pipe, the direction in which the one-way valve b allows medium to circulate is from the lower cavity to the outside of the separator, and a valve is arranged in the drain outlet.

Further, a liquid level sensor is also installed in the lower chamber, and an electric contact vacuum gauge is installed on the tank wall at the top end of the upper chamber.

Further, the positive pressure pipeline system comprises an air injection pressurizing main pipe, an air injection pressurizing branch pipe a and an air injection pressurizing branch pipe b, the air injection pressurizing branch pipe a and the air injection pressurizing branch pipe b are communicated with the air injection pressurizing main pipe through a three-way joint, the air injection pressurizing branch pipe b is communicated with an air inlet on the lower cavity, a pressure regulating valve and a pneumatic valve a are respectively arranged in the middle section of the air injection pressurizing branch pipe b, the air injection pressurizing branch pipe a is communicated with an air storage tank charging port, and a check valve is arranged in the middle section of the air injection pressurizing branch pipe a.

Further, the negative pressure pipeline system comprises a pneumatic three-way ball valve, a main port of the pneumatic three-way ball valve is connected with a negative pressure pumping main pipe, two auxiliary ports of the pneumatic three-way ball valve are respectively communicated with an exhaust port a and an exhaust port b through negative pressure pumping branch pipes, and a pneumatic valve b is further installed in the middle section of the negative pressure pumping main pipe.

Furthermore, the gas-liquid inlet and the exhaust ports a and b are L-shaped, the directions of the exhaust ports a and b and the port direction of the gas-liquid inlet are opposite, and the bottom end of the circular tube in the middle of the blind plate is lower than the port position of the exhaust port a.

Further, the air storage tank is provided with a safety valve, an air pressure gauge, a water drain valve and three air outlets, the three air outlets are respectively provided with an electromagnetic air valve a, an electromagnetic air valve b and an electromagnetic air valve c, and the output ends of the electromagnetic air valve a, the electromagnetic air valve b and the electromagnetic air valve c are respectively communicated with the air inlet ends of the pneumatic actuating mechanisms of the pneumatic valve a, the pneumatic three-way ball valve and the pneumatic valve b through high-pressure air pump hoses.

Further, the gas injection pressurizing main pipe is communicated with a pressurizing end of external positive pressure source equipment, and the positive pressure source equipment is an air compressor; the other end of the negative pressure pumping main pipe is connected with a pumping port of negative pressure pumping equipment, and the negative pressure pumping equipment is a vacuum pump.

Furthermore, the valve core of the pneumatic three-way ball valve adopts an L-shaped valve core.

Further, the control box comprises a PLC controller and a DC power supply for providing electric energy for the PLC controller, the electric contact vacuum meter and the liquid level sensor; the signal receiving end of the PLC is respectively and electrically connected with the signal output ends of the electric contact vacuum meter and the liquid level sensor through signal wires, and the instruction output end of the PLC is respectively and electrically connected with the electromagnetic air valve a, the electromagnetic air valve b and the electromagnetic air valve c through signal wires.

Further, the upper limit full water position of the liquid level sensor is lower than the air outlet a and the air inlet, and the lower limit low water level sensing point of the liquid level sensor is positioned at a position 1-2 cm above the drain pipe.

The beneficial effects are that:

the utility model adopts an upper cavity and a lower cavity to alternately serve as vacuum pumping and draining gas separating cavities, is matched with a one-way valve a designed between the two cavities, and is communicated with a negative pressure pumping and draining main pipe through a pneumatic three-way ball valve and a negative pressure pumping and draining branch pipe, the upper cavity and the lower cavity in the separator can be switched by switching a pumping and draining passage, when water is needed to be drained, the upper cavity can serve as a temporary pumping and draining separating cavity, the lower cavity is in an independent closed space, and air is injected into the lower cavity for pressurization by means of a positive pressure source or equipment, so that the traditional forced draining pump is replaced by a pressurizing and draining mode while the pumping and draining work is not stopped, and the safety is far higher than that of the traditional liquid-gas separating device.

In addition, when the vacuum pumping and draining device is used for draining water, the lower cavity is disconnected from the negative pressure pumping end of the vacuum pumping and draining device, so that when the pressurizing and draining are implemented by injecting air pressure, the vacuum pumping and draining effect is not damaged, meanwhile, the external positive pressure source equipment is not adversely affected, the external positive pressure source equipment can finish the pressurizing and draining in the separator in a normal working scope, the draining effect is far superior to that of the traditional water pump, the positive pressure source equipment can completely realize that one positive pressure source equipment simultaneously provides pressurizing operation for a plurality of separators based on the requirements of a construction site, compared with the forced draining process of the traditional separator, the vacuum pumping and draining device is more energy-saving and environment-friendly, has lower failure rate, and only needs to switch the negative pressure pumping and draining channel to the lower cavity again once the draining is finished, and the exhaust port of the upper cavity is closed and the positive pressure source is cut off; the switching of the upper cavity and the lower cavity is provided with signals by the liquid level sensor, the PLC is matched with the electromagnetic air valve and the pneumatic valve a and the pneumatic three-way ball valve to achieve automatic control, labor cost can be saved, and the risk of equipment damage caused by worker errors is reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a piping connection and control system according to the present utility model;

FIG. 3 is a schematic diagram of a separator according to the present utility model;

FIG. 4 is a schematic diagram of the structure of the air storage tank of the present utility model.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. It should be noted that the description of these examples is for aiding in understanding the present utility model, but is not intended to limit the present utility model.

Examples:

in order to solve the problems of potential safety hazard, low drainage efficiency and high energy consumption of pneumatic liquid-gas separation equipment (traditional pneumatic liquid-gas separation equipment) adopted by vacuum pumping of foundation dewatering and vacuum preloading at present, the pneumatic liquid-gas separation equipment for replacing the traditional water pump forced drainage by positive pressure pressurization drainage is provided, and the specific scheme is as follows:

as shown in fig. 1 and 3, the pneumatic liquid-gas separation equipment disclosed by the utility model specifically comprises a separator 1 and a pipeline connection and control system; the pipeline connection and control system is arranged outside the separator 1, wherein the pipeline connection and control system comprises a control box 18, a positive pressure pipeline system, a negative pressure pipeline system and a gas storage tank 19.

The separator 1 comprises a tank body, an upper cavity 3 and a lower cavity 4 are separated from the inside of the tank body through a blind plate 2, a round pipe which is used for communicating the upper cavity 3 with the lower cavity 4 is vertically arranged in the middle of the blind plate 2 towards the lower cavity 4, a one-way valve a5 is arranged in the middle of the round pipe, the direction of medium circulation allowed by the one-way valve a5 is from the upper cavity 3 to the lower cavity 4, a gas-liquid inlet 12 and a gas outlet b13 are respectively arranged at two sides of the upper cavity 3, which are close to the top, a gas inlet 9 and a gas outlet a10 are respectively arranged at two sides of the lower cavity 4, which are close to the top, the gas-liquid inlet 12, the gas outlet a10 and the gas outlet b13 are respectively in L-shaped designs, the port directions of the gas outlet a10 and the gas outlet b13 are opposite to the port directions of the gas-liquid inlet 12, the round pipe bottom end of the blind plate 2 is lower than the port position of the gas outlet a10, the upper cavity 3 and the lower cavity 4 are communicated by the round pipe, and the medium circulation directions between the upper cavity and the lower cavity are limited by the one-way valve a5, so that a negative pressure pipeline system and a control box 18 are matched between the upper cavity and the lower cavity and the two cavities are flexibly switched, and negative pressure can not affect the normal negative pressure of the two cavities.

The drain 6 and the drain pipe 7 are installed respectively to the bottom center of lower cavity 4 and the side that is close to the bottom, check valve b8 is installed to the middle section of drain pipe 7, the direction that check valve b8 allowed medium circulation is from lower cavity 4 to the outside direction of separator 1, install the valve in drain 6, wherein, set up drain 6 cooperation valve in lower cavity 4 bottom, mainly for the convenience of staff discharges the silt that lower cavity 4 bottom was deposited, in order to ensure that there is sufficient space in lower cavity 4 to be used for buffering water, still avoid lower cavity 4 silt too much simultaneously, get into drain pipe 7 in a large number when the drainage leads to drain pipe 7 to block up or hinder its airtight ground to reduce when the inside check valve b8 of drain pipe 7 is closed.

In addition, in order to achieve the purpose of water full, namely discharging, a liquid level sensor 11 is also arranged in the lower chamber 4, in order to prevent the water level in the lower chamber 4 from being too high, the upper limit full water position of the liquid level sensor 11 is lower than the exhaust port a10 and the air inlet 9, and the lower limit low water level sensing point of the liquid level sensor 11 is positioned at a position 1-2 cm above the drain pipe 7.

In order to improve the energy-saving effect, the vacuum degree data in the separator 1 needs to be accurately obtained and controlled, so that the tank wall at the top end of the upper chamber 3 is provided with an electric contact vacuum meter 14, and as is well known, the pneumatic liquid-gas separation device is mainly applied to engineering dewatering and vacuum preloading construction, the suction pipe ends of the pneumatic liquid-gas separation device are connected to a plurality of well points or a plurality of vacuum filter pipes and drain boards, and the geological conditions of the blocks covered by each separator are not invariable, so that the management of a plurality of separators according to a uniform mode easily causes the problem that the vacuum degree is too high or too low in the tank body of the separator, and the suction effect is influenced by too high energy conservation and too low. Therefore, when the vacuum degree is too high, the vacuumizing port needs to be temporarily and temporarily closed, and when the vacuum degree in the separator 1 is reduced to the lowest threshold value of the expected index, the negative pressure suction end is opened again to keep the negative pressure suction end in a certain negative pressure interval; when the vacuum degree does not reach the requirement, the vacuum pump is increased or reduced to enlarge the pumping area.

What needs to be further explained is: before the device is used in operation, a worker needs to set the highest threshold value and the lowest threshold value of the vacuum degree in the separator 1 on the electric contact vacuum meter 14 in advance, when the vacuum degree in the separator is higher than the highest threshold value, the pneumatic ball valve b32 is closed through a PLC instruction, and when the vacuum degree in the separator is lower than the lowest threshold value, the pneumatic ball valve b32 is opened again, so that the effects of reducing consumption, saving energy and stabilizing air pressure are achieved.

As shown in fig. 1-2, in order to realize positive pressure drainage of the separator 1, the positive pressure pipeline system comprises a gas injection pressurizing main pipe 23, a gas injection pressurizing branch pipe a25 and a gas injection pressurizing branch pipe b26, the gas injection pressurizing branch pipe a25 and the gas injection pressurizing branch pipe b26 are communicated with the gas injection pressurizing main pipe 23 through a three-way joint 24, the gas injection pressurizing branch pipe b26 is communicated with the gas inlet 9 on the lower chamber 4, the gas injection pressurizing main pipe 23 is communicated with a pressurizing end of external positive pressure source equipment, and the positive pressure source equipment is an air compressor; when drainage is needed, high-pressure air is injected into the lower chamber 4, the pressure in the lower chamber 4 is increased, the pressure in the lower chamber 4 is higher than the pressure outside the separator 1 in this way, and under the action of positive pressure, accumulated water in the lower chamber 4 smoothly washes out the one-way valve b8 in the middle section of the drainage pipe 7, so that positive pressure drainage operation is completed.

Meanwhile, in order not to affect the continuous negative pressure pumping and draining effect in the separator 1 and to enable the positive pressure drainage to reach the corresponding lift requirements according to different terrains, the pressure regulating valve 28 and the pneumatic valve a29 are respectively installed in the middle section of the gas injection pressurizing branch pipe b26, wherein the pressure regulating valve 28 mainly has the function of regulating the pressure through the pressure regulating valve 28 to reach the pressure value required by drainage, and the pneumatic valve a29 is mainly used for carrying out on-off control on the gas inlet 9 and completing the actions of negative pressure pumping and drainage and positive pressure drainage by matching with the separator 1, the control box 18 and the negative pressure pipeline system.

In order to fully utilize the high-pressure air source provided by the positive pressure source equipment, a stable power source is provided for the pneumatic valve a29, the pneumatic valve b32 and the pneumatic three-way ball valve 15, the air injection pressurizing branch pipe a25 is communicated with the air charging port of the air storage tank 19, and the check valve 27 is arranged at the middle section of the air injection pressurizing branch pipe a25, so that the stable air pressure value can be always kept in the air storage tank 19.

As shown in fig. 1 and 2, in order to cooperate with the control box 18 to complete the function switching of the upper chamber 3 and the lower chamber 4 in the separator 1, the negative pressure pipeline system comprises a pneumatic three-way ball valve 15, a main port of the pneumatic three-way ball valve 15 is connected with a negative pressure pumping main pipe 17, two auxiliary ports of the pneumatic three-way ball valve 15 are respectively communicated with an exhaust port a10 and an exhaust port b13 through a negative pressure pumping branch pipe 16, the other end of the negative pressure pumping main pipe 17 is connected with a pumping port of the negative pressure pumping equipment, and a pneumatic valve b32 is further installed in the middle section of the negative pressure pumping main pipe 17.

As shown in fig. 1 and 4, the air storage tank 19 is provided with a safety valve, an air pressure gauge, a water drain valve and three air outlets, the three air outlets are respectively provided with an electromagnetic air valve a20, an electromagnetic air valve b21 and an electromagnetic air valve c31, and the output ends of the electromagnetic air valve a20, the electromagnetic air valve b21 and the electromagnetic air valve c31 are respectively communicated with the air inlet ends of pneumatic execution mechanisms of the pneumatic valve a29, the pneumatic three-way ball valve 15 and the pneumatic valve b32 through high-pressure air pump hoses 30.

The valve core of the pneumatic three-way ball valve 15 adopts an L-shaped valve core.

What needs to be further explained is: the pneumatic three-way ball valve 15 is used as a third type of automatic valve product except an electric electromagnetic valve and a hydraulic valve in the current automatic valve field, and is one of products for converting high-pressure air source into mechanical energy to drive the valve to open and close, and the pneumatic actuating mechanism and the matched air path switching accessories are all common mature products in the field, and belong to mature technologies in the valve field, so that the structures and functions of the pneumatic three-way ball valve 15 and the pneumatic valve a29 are not excessively described in the text.

As shown in fig. 1 and 2, in order to cooperate with the pipeline connection and control system to realize automatic control of the equipment, the control box 18 comprises a PLC controller 181, a DC power supply 182 for providing electric energy for the PLC controller 181, the electric contact vacuum gauge 14 and the liquid level sensor 11; the signal receiving end of the PLC 181 is respectively and electrically connected with the electric contact vacuum gauge 14 and the signal output end of the liquid level sensor 11 through a signal line 22, and the instruction output end of the PLC 181 is respectively connected with the electromagnetic air valve a20, the electromagnetic air valve b21 and the electromagnetic air valve c31 through the signal line 22.

What needs to be further explained is: the PLC controller 181 described above is a conventional programmable controller, and is one of the common and commonly used controllers in the field of mechanical equipment automation control, so the integrated control circuit and the working principle of the PLC controller 181 are not described in any great detail herein.

When the device is started initially, the pneumatic valve a29 is in a closed state under the condition that no positive pressure power source exists (the electromagnetic valve a20 is closed), namely the air inlet 9 is in a closed state, the pneumatic three-way ball valve 15 communicates the air outlet a10 with the negative pressure pumping main pipe 17 (the air outlet b13 is in a closed state), at the moment, the inside of the lower chamber 4, the inside of the upper chamber 3 and the outside of the separator 1 form pressure difference, the one-way valve a5 is opened under the action of the pressure difference, the one-way valve b8 in the middle section of the drain pipe 7 is closed under the action of the pressure difference, so that the lower chamber 4 is communicated with the upper chamber 3, gas and liquid entering the upper chamber 3 flow into the lower chamber 4 through the circular pipe 5, after the water amount in the lower chamber 4 reaches the threshold value set by the liquid level sensor 11, the liquid level sensor 11 sends out a signal when the liquid level signal is needed, the PLC controller 181 receives the liquid level signal, the electromagnetic valve a20 and the electromagnetic valve b21 are synchronously instructed, the pneumatic three-way ball valve 15 is enabled to switch the negative pressure suction passage, the exhaust port a10 is enabled to be closed, the exhaust port b13 and the pneumatic valve a29 are enabled to be opened, at the moment, the upper chamber 3 and the lower chamber 4 form pressure difference, the one-way valve a5 is automatically closed, after high-pressure gas provided by positive pressure source equipment enters the lower chamber 4 due to the opening of the pneumatic valve a29, the internal air pressure of the lower chamber 4 is higher than the external part of the separator 1, the one-way valve b8 in the middle section of the drain pipe 7 is smoothly flushed under the action of the pressure difference, positive pressure drainage is completed, at the moment, accumulated water generated by uninterrupted pumping of the upper chamber 3 is completely isolated from the lower chamber 4 in the temporary storage chamber, the whole drainage process is not interfered mutually, and the drainage of the accumulated water can be effectively completed on the premise of ensuring continuous effective vacuum pumping operation, when the accumulated water in the lower chamber 4 drops to the lowest threshold value set by the liquid level sensor 11, the liquid level sensor 11 sends a liquid level signal to the PLC 181 again, and after the PLC 181 receives the liquid level signal, an instruction is sent to the electromagnetic air valve a20 and the electromagnetic air valve b21, so that the pneumatic valve a29 is closed, the pneumatic three-way ball valve 15 switches a negative pressure suction passage so that the air outlet a10 is opened, and the air outlet b13 is closed, and the drainage and vacuum pumping operation is repeatedly implemented.

In addition, according to construction environment and site demand, under the condition that high-lift or short-distance drainage is not needed, the device is suitable for being used for injecting water on a vacuum pre-pressing film, in the construction that water is used as a pre-pressing load, after the pneumatic valve a29 is installed at the pipe end of the air inlet 9, a positive pressure source is not required to be connected, when the water is discharged, after the negative pressure suction chamber is switched, the pneumatic valve a29 is opened, the inside of the lower chamber 4 is communicated with the outside, after the air pressure of the lower chamber is balanced, the one-way valve b8 in the drain pipe 7 is flushed away under the dead weight of the water body, and automatic water discharge without external energy loss and intervention is achieved.

What needs to be further explained is: the valve on the drain 6 should be normally closed when it is not necessary to drain the sediment from the interior of the lower chamber 4.

Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (8)

1. A pneumatic liquid-gas separation device comprises a separator (1) and a pipeline connection and control system; the separator is characterized in that the separator (1) comprises a tank body, an upper cavity (3) and a lower cavity (4) are separated from the inside of the tank body through a blind plate (2), a round pipe which is used for communicating the upper cavity (3) with the lower cavity (4) is vertically arranged in the middle of the blind plate (2) towards the lower cavity (4), a one-way valve a (5) is arranged in the middle of the round pipe, a gas-liquid inlet (12) and an exhaust port b (13) are respectively arranged on two sides, close to the top, of the upper cavity (3), and an electric contact vacuum gauge (14) is arranged on the tank wall at the top end of the upper cavity (3); an air inlet (9) and an air outlet a (10) are respectively arranged on two sides, close to the top, of the lower cavity (4), a sewage outlet (6) and a drain pipe (7) are respectively arranged on the center of the bottom of the lower cavity (4) and on the side, close to the bottom, of the lower cavity, a one-way valve b (8) is arranged in the middle section of the drain pipe (7), and a liquid level sensor (11) is also arranged in the lower cavity (4);

the pipeline connection and control system is arranged outside the separator (1) and comprises a control box (18), a positive pressure pipeline system, a negative pressure pipeline system and a gas storage tank (19);

the positive pressure pipeline system comprises an air injection pressurizing main pipe (23), an air injection pressurizing branch pipe a (25) and an air injection pressurizing branch pipe b (26), wherein the air injection pressurizing branch pipe a (25) and the air injection pressurizing branch pipe b (26) are communicated with the air injection pressurizing main pipe (23) through a three-way joint (24), the air injection pressurizing branch pipe b (26) is communicated with an air inlet (9) on the lower cavity (4), a pressure regulating valve (28) and a pneumatic valve a (29) are respectively arranged at the middle section of the air injection pressurizing branch pipe b (26), the air injection pressurizing branch pipe a (25) is communicated with an air charging port of an air storage tank (19), and a check valve (27) is arranged at the middle section of the air injection pressurizing branch pipe a (25);

the negative pressure pipeline system comprises a pneumatic three-way ball valve (15), a main port of the pneumatic three-way ball valve (15) is connected with a negative pressure pumping main pipe (17), two auxiliary ports of the pneumatic three-way ball valve (15) are respectively communicated with an exhaust port a (10) and an exhaust port b (13) through a negative pressure pumping branch pipe (16), and a pneumatic valve b (32) is further arranged in the middle section of the negative pressure pumping main pipe (17).

2. A pneumatic liquid-gas separation apparatus according to claim 1, characterized in that the direction in which the one-way valve a (5) allows medium to flow is from the upper chamber (3) to the lower chamber (4), the direction in which the one-way valve b (8) allows medium to flow is from the lower chamber (4) to the outside of the separator (1), and the drain (6) is further provided with a valve.

3. A pneumatic liquid-gas separation device according to claim 1, wherein the gas-liquid inlet (12) and the exhaust ports a (10) and b (13) are all L-shaped, the exhaust ports a (10) and b (13) are designed in opposite directions to the port direction of the gas-liquid inlet (12), and the bottom end of the circular tube in the middle of the blind plate (2) is lower than the port position of the exhaust port a (10).

4. The pneumatic liquid-gas separation device according to claim 1, wherein the air storage tank (19) is provided with a safety valve, an air pressure gauge, a water drain valve and three air outlets, the three air outlets are respectively provided with an electromagnetic air valve a (20), an electromagnetic air valve b (21) and an electromagnetic air valve c (31), and the output ends of the electromagnetic air valve a (20), the electromagnetic air valve b (21) and the electromagnetic air valve c (31) are respectively communicated with the air inlet ends of pneumatic actuating mechanisms of the pneumatic valve a (29), the pneumatic three-way ball valve (15) and the pneumatic valve b (32) through high-pressure air pump hoses (30).

5. A pneumatic liquid-gas separation device according to claim 1, characterized in that the gas injection pressurizing main pipe (23) is communicated with a pressurizing end of an external positive pressure source device, and the positive pressure source device is an air compressor; the other end of the negative pressure pumping main pipe (17) is connected with a pumping port of negative pressure pumping equipment, and the negative pressure pumping equipment is a vacuum pump.

6. A pneumatic liquid-gas separation apparatus according to claim 4, wherein the spool of the pneumatic three-way ball valve (15) is an L-shaped spool.

7. A pneumatic liquid-gas separation apparatus according to claim 1, characterized in that the control box (18) comprises a PLC controller (181), a DC power supply (182) for providing electrical energy to the PLC controller (181) and to the electrical contact vacuum gauge (14) and the liquid level sensor (11); the signal receiving end of the PLC (181) is respectively and electrically connected with the signal output ends of the electric contact vacuum gauge (14) and the liquid level sensor (11) through a signal wire (22), and the instruction output end of the PLC (181) is respectively connected with the electromagnetic air valve a (20), the electromagnetic air valve b (21) and the electromagnetic air valve c (31) through the signal wire (22).

8. A pneumatic liquid-gas separation apparatus according to claim 1, characterized in that the upper limit full water position of the liquid level sensor (11) is lower than the air outlet port a (10) and the air inlet port (9), and the position of the lower limit low water level sensing point of the liquid level sensor (11) is 1-2 cm above the water discharge pipe (7).