CN113250222A - Intelligent pneumatic dewatering device for subway station foundation pit - Google Patents
Intelligent pneumatic dewatering device for subway station foundation pit Download PDFInfo
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- CN113250222A CN113250222A CN202110601520.8A CN202110601520A CN113250222A CN 113250222 A CN113250222 A CN 113250222A CN 202110601520 A CN202110601520 A CN 202110601520A CN 113250222 A CN113250222 A CN 113250222A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses an intelligent pneumatic dewatering device for a foundation pit of a subway station, which comprises a pneumatic motor and a centrifugal water pump, wherein the pneumatic motor is connected with the centrifugal water pump, and the air inlet end of the pneumatic motor is connected with a compressed air pipe through a control valve; the valve core is arranged in the valve cavity of the valve body through a compression spring; when the control valve is closed, the valve core is pre-installed at the port cavity of the valve cavity. The control valve has two constant pressure drive modes. This device can automatic control centrifugal pump open stop, and the ground water level in the subway station foundation ditch risees to the high-order time start and draws water, stops after the water level reduces. Compressed air supplied by the ground is used as power to drive the starting motor and drive the centrifugal water pump to rotate, a double constant pressure mode is adopted for control, and the whole control process is stable and continuous. The underground part of the device does not use electricity, does not have any electric and electronic parts, has no special requirements on the environment in the foundation pit, has wider applicable scenes, and is more suitable for severe conditions such as turbid water quality in the foundation pit.
Description
Technical Field
The invention relates to a starting dewatering device, in particular to a pneumatic dewatering device which is intelligently controlled and driven without using an electronic element, and belongs to the technical field of foundation pit drainage devices.
Background
In the process of foundation pit construction, in order to prevent water inrush and mud emission accidents, a widely adopted engineering measure is foundation pit drainage; the aquifer of the engineering site is usually buried in a deep part and is generally difficult to be directly contacted by personnel in a large area, so that the aquifer, particularly the confined aquifer, needs to be treated urgently.
Chinese patent 201610312149.2 relates to a clean foundation pit dewatering system for coupling foundation pit dewatering with contaminated site remediation, which is used for realizing the repair of foundation pit dewatering and contaminated site in a control range site, wherein the control range site comprises a first water-resisting layer, a water-containing layer and a second water-resisting layer from top to bottom, and the foundation pit dewatering system comprises equipment members such as an active infiltration ditch, a foundation pit curtain, a pumping well and an observation well; the cleaning effect on pollutants in a control range field can be effectively realized through large-scale pumping and drainage of foundation pit dewatering. The foundation pit dewatering and active percolation wall technology in site restoration are coupled into a whole, and the environmental quality of the restoration engineering site is monitored and maintained for a long time.
Chinese patent 201721126851.6 proposes a foundation pit dewatering device and a foundation pit dewatering system, the device includes: the cushion layer is arranged on the bottom wall of the foundation pit; a sump disposed below the cushion layer; the water quantity detection device is arranged in the water collecting pit and used for detecting the water content in the water collecting pit; the water pump is arranged in the water collecting pit; and the controller is electrically connected with the water quantity detection device and used for receiving the water content detected by the water quantity detection device and controlling the running state of the water pump according to the water content. The automatic pumping of the accumulated water in the water collecting pit is realized through the water quantity detection device, the controller and the water pump, so that the aim of automatic precipitation of the foundation pit is fulfilled; on one hand, the device does not need constructors to observe the water content of the water collecting pit, thereby saving a large amount of manpower and material resources and reducing the construction cost; on the other hand, the running state of the water pump is controlled by detecting the water content in the water collecting pit through the water quantity detection device, so that the accumulated water in the water collecting pit is prevented from overflowing to the surface of the cushion layer too much, and the phenomenon of dry burning of the pump is avoided.
Chinese patent 201610736767.X proposes a device and a construction method for lowering water in a foundation pit by using a pneumatic water pump, wherein the device comprises a water pump, a control cabinet and an air compressor; the water pump is a pneumatic water pump and comprises a container and a sensor, the container consists of a container wall and a cavity, and the sensor is arranged on the outer surface of the top surface of the container wall; the container is characterized in that a water inlet, a water outlet and an air inlet are arranged on the container wall, check valves are arranged at the water inlet and the water outlet, and an exhaust valve is arranged at the air inlet. The pneumatic water pump is used for replacing a submersible pump to pump water, so that the water pump is not easy to damage, and equipment is not worried about idling; utilize switch board control pneumatic water pump, make the water pump process of drawing water more accurate, set up in addition that vacuum generator takes out into vacuum in with the well, improved the efficiency of taking out.
Chinese patent 201921070394.2 proposes an air pressure automatic water lowering pump, which comprises a water storage tank, and a water inlet pipe, a water outlet pipe and an air inlet pipe which are fixedly installed on the top of the water storage tank and communicated with the tank, wherein the upper port of the air inlet pipe is used for connecting an air storage tank of an air compressor through an air supply pipeline; the upper end of the water outlet pipe is connected with a water outlet pipeline, and the lower end of the water outlet pipe extends into the bottom of the water storage tank; the diameter of the upper end opening of the water inlet pipe is smaller than that of the water inlet pipe, the lower end of the water inlet pipe extends into the bottom of the water storage tank, a net piece used for filtering impurities in water is installed on the upper portion of the water inlet pipe, a floating ball is arranged between the net piece and the upper end opening of the water inlet pipe, and the diameter of the floating ball is larger than that of the upper end opening of the water inlet pipe.
In the foundation pit dewatering system disclosed at present, the structures such as the traditional infiltration ditch, the foundation pit curtain, the pumping well and the like are mainly adopted, or in the existing device, the control and the driving are mostly carried out based on a sensor.
In order to avoid the operation of carrying water in the foundation pit and ensure the stability and the soil excavation safety of the foundation pit, layered precipitation and layered excavation is adopted, the water level of precipitation is controlled to be 1m below an excavation line at each time, and meanwhile, the relative balance of soil body settlement caused by precipitation and soil body uplift caused by foundation pit excavation is considered, and an intelligent pneumatic precipitation method is adopted through optimization. The automatic water starting and stopping levels are set in advance according to the precipitation scheme, so that the automatic control of the foundation pit precipitation water level is realized, and the difficult problems of different water inflow, larger water return time difference and the like of each pipe well are effectively solved. In addition, a spare well is additionally arranged, precipitation equipment is timely added according to the precipitation condition, and the effect of confined water precipitation and the safety of foundation pit excavation construction are ensured. An intelligent pneumatic precipitation complete equipment mainly comprises an air supply system (a variable frequency screw air compressor), an intelligent control system (an intelligent control terminal) and an air-water displacement system (an air-water displacement pump). This equipment provides compressed air by the air compressor machine, through intelligent control terminal, transmits compressed air to the air water replacement pump of setting in the pipe shaft, utilizes pneumatic technology with the water discharge pipe shaft, combines sensor control air water replacement pump to realize intelligent precipitation. The gas-water displacement pump comprises a pneumatic control box and a displacer (double layers), wherein the pneumatic control box is connected with the displacer through a gas pipeline with a sensor, the sensor is clamped on a bracket of the displacer, a gas pipe at the end of the sensor is inserted into a gas inlet of the displacer, the other end of the gas pipe is connected with a gas outlet quick connector of the control box, and a data connector is connected with a corresponding signal quick connector; the double-layer displacer is provided with 2 air pipes and 1 data line. In actual field application, the construction environment of a foundation pit is relatively disordered, relatively large requirements are placed on application of electronic elements, and in the construction field, ensuring the power utilization safety of circuit elements is very important.
The invention aims to design a novel pneumatic dewatering device, so that the water level in a foundation pit is maintained at a constant position, when the water level in the foundation pit rises, the device can control the water level in the foundation pit in time to achieve the effect of intelligent control, and meanwhile, the pneumatic dewatering device does not need any electronic element and is relatively safe as a whole.
Disclosure of Invention
The invention aims to provide an intelligent pneumatic water lowering device for a foundation pit of a subway station, which can realize pneumatic water lowering and can be correspondingly adjusted according to the water level change in the foundation pit so as to ensure that the water level of the foundation pit is maintained at a constant level.
In order to achieve the purpose, the technical scheme adopted by the invention is an intelligent pneumatic water lowering device for a foundation pit of a subway station, which comprises a pneumatic motor 1 and a centrifugal water pump 2, wherein the pneumatic motor 1 is connected with the centrifugal water pump 2, and the air inlet end of the pneumatic motor 1 is connected with a compressed air pipe 4 through a control valve 3; the air outlet end of the pneumatic motor 1 is connected with an exhaust gas discharge pipe 5; the pneumatic motor 1 is arranged at the upper part of the centrifugal water pump 2, a water inlet disc 6 is arranged between the pneumatic motor 1 and the centrifugal water pump 2, and a plurality of water suction holes 7 are circumferentially arranged on the water inlet disc 6; the water inlet disc 6 is used for lowering water to the foundation pit of the subway station through the water suction holes 7.
The control valve 3 consists of a valve body 31, a valve core 32 and a compression spring 33, wherein the valve core 32 is arranged in the valve cavity of the valve body 31 through the compression spring 33; when the control valve 3 is closed, the spool 32 is pre-installed at the port chamber of the valve chamber. The pneumatic constant pressure valve a311 and the pneumatic constant pressure valve B312 are arranged at both ends of the valve body 31 in an up-down symmetrical manner. The pneumatic constant pressure valve A311 corresponds to a constant pressure chamber AI, and the pneumatic constant pressure valve B312 corresponds to a constant pressure chamber BII; the air passage of the compressed air pipe 4 entering the control valve 3 is divided into two branches, one branch is communicated with an auxiliary air pressure flow passage port 321 through an air inlet 316, and the auxiliary air pressure flow passage port 321 is communicated with a constant pressure cavity AI; the other branch is communicated with a high-pressure cavity III through an air inlet channel 318, the high-pressure cavity III is connected with a constant-pressure cavity BII through a throttling port, and the air pressure in the constant-pressure cavity BII is adjusted through the throttling port; the normal pressure balance port 313 is arranged at the middle outer side of the valve body 31; the water level adjusting stud 314 is arranged on an air passage communicated with the valve core 32 through the auxiliary air pressure flow passage port 321 of the valve body 31, the acting force applied on the valve core 32 by the air flowing along the air passage of the constant pressure cavity AI is adjusted through the water level adjusting stud 314, and the corresponding pressure difference threshold value of the valve core 32 is adjusted to be opened and closed, so that the control valve 3 is adapted to the corresponding water level position. The floating trigger mandril 315 is arranged at the side part of the constant pressure cavity AI and is opposite to the valve core 32; the side of the control valve 3 is a connecting rod shaft seat 319; the spring 320 is provided inside the pneumatic constant pressure valve a311 and the pneumatic constant pressure valve B312, and adjusts the pressure of the control valve 3 accordingly. The control valve 3 has two constant pressure driving modes.
When the water level is higher than the pressure difference of a certain preset water level, the total thrust generated by the air pressure of the constant pressure cavity AI to the valve core 32 is higher than the total thrust generated by the air pressure of the constant pressure cavity BII to the valve core 32, the valve core 32 is pushed to move along the valve body 31, the compression spring 33 is compressed, the high pressure cavity III is communicated with the variable pressure cavity IV, and the high pressure gas from the pneumatic motor 1 flows into the variable pressure cavity IV through the high pressure cavity III and flows out through the gas outlet 317; when the water level is lower than the corresponding preset water level, the total thrust generated by the air pressure of the constant pressure cavity AI to the valve core 32 is lower than the total thrust generated by the air pressure of the constant pressure cavity BII to the valve core 32, the valve core 32 is reset under the action of the compression spring 33, the connection between the high pressure cavity III and the variable pressure cavity IV is blocked, and the control valve 3 is closed. This is the first constant voltage driving mode.
When the control valve 3 is closed, the floating trigger mandril 315 is arranged at one side of the valve body 31 and is contacted with the end part of the valve core 32, and at the moment, the floating trigger mandril 315 does not push the valve core 32; when the buoy 8 rises, the buoy 8 drives one end of the connecting rod 9 to move around the pin shaft through the pull rope 18, and the other end of the connecting rod 9 presses down the buoy trigger mandril 315; the valve core 32 is pushed by the float trigger mandril 315 to move along the valve body 31, the compression spring 33 is further compressed, the high-pressure cavity III is communicated with the variable-pressure cavity IV, and high-pressure gas from the pneumatic motor 1 flows into the variable-pressure cavity IV through the high-pressure cavity III and flows out through the gas outlet 317; this time, the second constant voltage driving mode.
Further, when any one of the above constant pressure driving modes is performed, the air motor rotor 102 of the air motor 1 driven by the constant pressure high pressure air rotates around the air motor rotor 103, and the water in the foundation pit of the subway station is discharged into the water discharge port 14 through the water suction hole 7 and the centrifugal water pump 2.
Further, the air motor rotor 103 drives the rotating shaft 21 of the centrifugal water pump 2 to move, and the rotating shaft 21 drives the centrifugal pump blade 22 to rotate. The pneumatic motor 1 further comprises a snap ring 101, a sealing rubber ring 104, a pneumatic motor exhaust port 105, a pneumatic motor air inlet 106 and an expansion cavity 107; the rotating shaft 21 is arranged in the middle of the top of the pneumatic motor 1 through a clamping ring 101, and a sealing rubber ring 104 is arranged at the joint of the rotating shaft 21 and the pneumatic motor 1; the air outlet 105 of the pneumatic motor is communicated with the exhaust gas outlet pipe 5; the air inlet 106 of the pneumatic motor is communicated with the compressed air pipe 4, and the compressed air pipe 4 is filled with constant-pressure high-pressure air to push the rotary vane 102 of the pneumatic motor to rotate around the rotor 103 of the pneumatic motor; the expansion chamber 107 has a variable chamber structure in which the air motor rotor 102 is eccentrically mounted in the air motor 1, and the air is discharged by a change in the volume of the expansion chamber 107.
Further, a drain port 14 is provided at a side portion of the centrifugal water pump 2, and is communicated with a drain pipe 15 through the drain port 14.
Further, the centrifugal water pump 2 is mounted on the base 16.
Further, the top of the air motor 1 is sealed by a disk cover 17.
Further, the control valve 3 should be immersed in the foundation pit water of the subway station.
Further, the air conditioner is provided with a fan,
compared with the prior art, the invention has the following technical advantages.
1. This device can automatic control centrifugal pump open stop, and the ground water level in the subway station foundation ditch risees to the high-order time start and draws water, stops after the water level reduces.
2. Compressed air supplied by the ground is used as power to drive the starting motor and drive the centrifugal water pump to rotate, a double constant pressure mode is adopted for control, and the whole control process is stable and continuous.
3. The underground part of the device does not use electricity, does not have any electric and electronic parts, and is suitable for severe underground conditions.
4. The opening and closing of the floating pull valve can be adopted to control the starting and the stopping of the water pump; when the buoy cannot be used, a double constant pressure valve device can be utilized, and a control valve drives the valve to start and stop through the change of the water pressure, so that the water level is indirectly kept constant; the water pressure threshold value in the foundation pit of the subway station can be adjusted through the stud. The intelligent control system ingeniously utilizes the water pressure and pneumatic control principle of the foundation pit, intelligently controls the water level drainage in the foundation pit through dynamic balance, effectively carries out automatic intelligent regulation on the drainage of the foundation pit, and is more intelligent and safer in the whole structure.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention.
Fig. 2 is a schematic diagram of the pneumatic motor, centrifugal water pump and control valve connections.
Fig. 3 is a schematic cross-sectional view of the connection of the pneumatic motor, centrifugal water pump and control valve.
Fig. 4 is a working sectional view of the pneumatic motor.
Fig. 5 is a schematic view of the assembly structure of the pneumatic motor and the centrifugal water pump.
Fig. 6 is a schematic view of the installation of the pneumatic motor and the centrifugal water pump.
Fig. 7 is a schematic structural view of the control valve.
Fig. 8 is a schematic diagram of the control valve closing.
Fig. 9 is a schematic view of the opening of the control valve.
FIG. 10 is a schematic view of the control valve internal gas flow passage communication.
Fig. 11 is a schematic diagram of the structure of the buoy.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of an exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
As shown in fig. 1, the intelligent pneumatic precipitation device for the foundation pit of the subway station comprises a pneumatic motor 1 and a centrifugal water pump 2, wherein the pneumatic motor 1 is connected with the centrifugal water pump 2, and an air inlet end of the pneumatic motor 1 is connected with a compressed air pipe 4 through a control valve 3; the air outlet end of the pneumatic motor 1 is connected with an exhaust gas discharge pipe 5; the pneumatic motor 1 is arranged at the upper part of the centrifugal water pump 2, a water inlet disc 6 is arranged between the pneumatic motor 1 and the centrifugal water pump 2, and a plurality of water suction holes 7 are circumferentially arranged on the water inlet disc 6; the water inlet disc 6 is used for lowering water to the foundation pit of the subway station through the water suction holes 7.
As shown in fig. 2 and 3, the control valve 3 is composed of a valve body 31, a valve core 32 and a compression spring 33, wherein the valve core 32 is installed in a valve cavity of the valve body 31 through the compression spring 33; when the control valve 3 is closed, the spool 32 is pre-installed at the port chamber of the valve chamber.
The valve body 31 is provided with a pneumatic constant pressure valve A311, a pneumatic constant pressure valve B312, a normal pressure balance port 313, a water level adjusting stud 314, a float trigger mandril 315, an air inlet 316, an air outlet 317, an air inlet channel 318, a connecting rod shaft seat 319, a spring 320 and an auxiliary air pressure flow passage port 321. The pneumatic constant pressure valve a311 and the pneumatic constant pressure valve B312 are arranged at both ends of the valve body 31 in an up-down symmetrical manner. The pneumatic constant pressure valve A311 corresponds to a constant pressure chamber AI, and the pneumatic constant pressure valve B312 corresponds to a constant pressure chamber BII; the air passage of the compressed air pipe 4 entering the control valve 3 is divided into two branches, one branch is communicated with an auxiliary air pressure flow passage port 321 through an air inlet 316, and the auxiliary air pressure flow passage port 321 is communicated with a constant pressure cavity AI; the other branch is communicated with a high-pressure cavity III through an air inlet channel 318, the high-pressure cavity III is connected with a constant-pressure cavity BII through a throttling port, and the air pressure in the constant-pressure cavity BII is adjusted through the throttling port; the control valve 3 is vertically arranged in a foundation pit of a subway station (only the vertical arrangement can realize the air pressure and water pressure balance adjustment of the pneumatic constant pressure valve A311 and the pneumatic constant pressure valve B312), and the external water pressure borne by the pneumatic constant pressure valve A311 is smaller than that borne by the pneumatic constant pressure valve B312; because the control valve 3 is used as a constant pressure valve, the air pressure and the water pressure are in a corresponding relation, and the air pressure of the constant pressure cavity AI is smaller than the air pressure in the constant pressure cavity BII. The atmospheric pressure balance port 313 is disposed outside the middle of the valve body 31 to balance the air pressure in the atmospheric pressure chamber V, so as to ensure that a pressure difference can be generated when the air pressures of the constant pressure chamber AI and the constant pressure chamber BII act on the valve core 32, thereby pushing the valve core 32 to move. The water level adjusting stud 314 is arranged on an air passage communicated with the valve core 32 through the auxiliary air pressure flow passage port 321 of the valve body 31, the acting force applied on the valve core 32 by the air flowing along the air passage of the constant pressure cavity AI is adjusted through the water level adjusting stud 314, and the corresponding pressure difference threshold value of the valve core 32 is adjusted to be opened and closed, so that the control valve 3 is adapted to the corresponding water level position. The floating trigger mandril 315 is arranged at the side part of the constant pressure cavity AI and is opposite to the valve core 32; the side of the control valve 3 is a connecting rod shaft seat 319; the spring 320 is provided inside the pneumatic constant pressure valve a311 and the pneumatic constant pressure valve B312, and adjusts the pressure of the control valve 3 accordingly. The control valve 3 has two constant pressure driving modes.
When the water level is higher than the pressure difference of a certain preset water level (namely the preset drainage water level of the foundation pit of the subway station), the total thrust generated by the air pressure of the constant pressure cavity AI on the valve core 32 is higher than the total thrust generated by the air pressure of the constant pressure cavity BII on the valve core 32, the valve core 32 is pushed to move along the valve body 31, the compression spring 33 is further compressed, the high pressure cavity III is communicated with the variable pressure cavity IV, and the high pressure gas from the pneumatic motor 1 flows into the variable pressure cavity IV through the high pressure cavity III and flows out through the gas outlet 317; when the water level is lower than the corresponding preset water level, the total thrust generated by the air pressure of the constant pressure cavity AI to the valve core 32 is lower than the total thrust generated by the air pressure of the constant pressure cavity BII to the valve core 32, the valve core 32 is reset under the action of the compression spring 33, the connection between the high pressure cavity III and the variable pressure cavity IV is blocked, and the control valve 3 is closed. This is the first constant voltage driving mode.
When the control valve 3 is closed, the floating trigger mandril 315 is arranged at one side of the valve body 31 and is contacted with the end part of the valve core 32, and at the moment, the floating trigger mandril 315 does not push the valve core 32; when the buoy 8 rises, the buoy 8 drives one end of the connecting rod 9 to move around the pin shaft through the pull rope 18, and the other end of the connecting rod 9 presses down the buoy trigger mandril 315; the valve core 32 is pushed by the float trigger mandril 315 to move along the valve body 31, the compression spring 33 is further compressed, the high-pressure cavity III is communicated with the variable-pressure cavity IV, and high-pressure gas from the pneumatic motor 1 flows into the variable-pressure cavity IV through the high-pressure cavity III and flows out through the gas outlet 317; this time, the second constant voltage driving mode.
When any one of the above constant pressure driving modes is performed, the air motor rotor 102 of the air motor 1 driven by the constant pressure high pressure air rotates around the air motor rotor 103, and the water in the foundation pit of the subway station is discharged into the water outlet 14 through the water suction hole 7 and the centrifugal water pump 2.
As shown in fig. 4-11, the air motor rotor 103 drives the rotating shaft 21 of the centrifugal pump 2, and the rotating shaft 21 drives the centrifugal pump blade 22 to rotate. The pneumatic motor 1 further comprises a snap ring 101, a sealing rubber ring 104, a pneumatic motor exhaust port 105, a pneumatic motor air inlet 106 and an expansion cavity 107; the rotating shaft 21 is arranged in the middle of the top of the pneumatic motor 1 through a clamping ring 101, and a sealing rubber ring 104 is arranged at the joint of the rotating shaft 21 and the pneumatic motor 1; the air outlet 105 of the pneumatic motor is communicated with the exhaust gas outlet pipe 5; the air inlet 106 of the pneumatic motor is communicated with the compressed air pipe 4, and the compressed air pipe 4 is filled with constant-pressure high-pressure air to push the rotary vane 102 of the pneumatic motor to rotate around the rotor 103 of the pneumatic motor; the expansion chamber 107 has a variable chamber structure in which the air motor rotor 102 is eccentrically mounted in the air motor 1, and the air is discharged by a change in the volume of the expansion chamber 107.
The centrifugal water pump 2 is provided with a water outlet 14 at a side thereof, and is communicated with a water discharge pipe 15 through the water outlet 14.
The centrifugal water pump 2 is arranged on a base 16.
The top of the pneumatic motor 1 is sealed by a disc cover 17.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes, including changes in the materials and connection modes, may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and any modifications, equivalent substitutions, improvements, and the like made therein are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a pneumatic precipitation device of subway station foundation ditch intelligence which characterized in that: the pneumatic motor is connected with the centrifugal water pump, and an air inlet end of the pneumatic motor is connected with a compressed air pipe through a control valve; the air outlet end of the pneumatic motor is connected with an exhaust gas discharge pipe; the pneumatic motor is arranged at the upper part of the centrifugal water pump, a water inlet disc is arranged between the pneumatic motor and the centrifugal water pump, and a plurality of water suction holes are circumferentially arranged on the water inlet disc; the water inlet disc is used for dewatering a foundation pit of the subway station through the water absorption hole;
the control valve consists of a valve body, a valve core and a compression spring, wherein the valve core is arranged in a valve cavity of the valve body through the compression spring; when the control valve is closed, the valve core is pre-installed at the port cavity of the valve cavity; the pneumatic constant pressure valve A and the pneumatic constant pressure valve B are symmetrically arranged at two ends of the valve body from top to bottom; the pneumatic constant pressure valve A corresponds to a constant pressure cavity A, and the pneumatic constant pressure valve B corresponds to a constant pressure cavity B; the air passage of the compressed air pipe entering the control valve is divided into two branches, one branch is communicated with an auxiliary air pressure flow passage port through an air inlet, and the auxiliary air pressure flow passage port is communicated with the constant pressure cavity A; the other branch is communicated with the high-pressure cavity through an air inlet channel, the high-pressure cavity is connected with the constant-pressure cavity B through a throttling port, and the air pressure in the constant-pressure cavity B is adjusted through the throttling port; the normal pressure balance port is arranged at the outer side of the middle of the valve body; the water level adjusting stud is arranged on an air passage communicated with the valve core at the auxiliary air pressure flow passage opening of the valve body, the acting force of the air flowing along the air passage of the constant pressure cavity A on the valve core is adjusted through the water level adjusting stud, and the corresponding pressure difference threshold value for opening and closing the valve core is adjusted, so that the control valve is adapted to the corresponding water level position; the floating trigger mandril is arranged at the side part of the constant pressure cavity A and is opposite to the valve core; the side part of the control valve is a connecting rod shaft seat; the springs are arranged on the inner sides of the pneumatic constant pressure valve A and the pneumatic constant pressure valve B and used for adjusting the corresponding pressure intensity of the control valve; the control valve has two constant pressure drive modes.
2. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: in a first constant-pressure driving mode, when the water level is higher than the pressure difference of a certain preset water level, the total thrust generated by the air pressure of a constant-pressure cavity A on a valve core is higher than the total thrust generated by the air pressure of a constant-pressure cavity B on the valve core, the valve core is pushed to move along a valve body, a compression spring is compressed, a high-pressure cavity is communicated with a variable-pressure cavity, and high-pressure gas from a pneumatic motor flows into the variable-pressure cavity through the high-pressure cavity and flows out through an air outlet; when the water level is lower than the corresponding preset water level, the total thrust generated by the air pressure of the constant pressure cavity A to the valve core is lower than the total thrust generated by the air pressure of the constant pressure cavity B to the valve core, the valve core is reset under the action of the compression spring, the connection between the high pressure cavity and the variable pressure cavity is blocked, and the control valve is closed.
3. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: in the second constant-pressure driving mode, when the control valve is closed, the floating trigger ejector rod is arranged on one side of the valve body and is in contact with the end part of the valve core, and the floating trigger ejector rod does not push the valve core at the moment; when the buoy rises, the buoy drives one end of the connecting rod to move around the pin shaft through the pull rope, and the other end of the connecting rod presses down the buoy to trigger the ejector rod; the buoy triggers the ejector pin to push the valve core to move along the valve body, the compression spring is further compressed, the high-pressure cavity is communicated with the variable-pressure cavity, and high-pressure gas from the pneumatic motor flows into the variable-pressure cavity through the high-pressure cavity and flows out through the gas outlet.
4. The intelligent pneumatic water lowering device for the subway station foundation pit as claimed in claim 1, 2 or 3, wherein: the pneumatic motor rotor on the pneumatic motor driven by the constant-pressure high-pressure gas rotates around the pneumatic motor rotor, and water in the foundation pit of the subway station is discharged into the water outlet through the water suction hole and the centrifugal water pump.
5. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: the rotor of the pneumatic motor drives a rotating shaft on the centrifugal water pump to move, and the rotating shaft drives blades of the centrifugal pump to rotate; the pneumatic motor also comprises a clamping ring, a sealing rubber ring, a pneumatic motor exhaust port, a pneumatic motor air inlet and an expansion cavity; the rotating shaft is arranged in the middle of the top of the pneumatic motor through a clamping ring, and a sealing rubber ring is arranged at the joint of the rotating shaft and the pneumatic motor; the air outlet of the pneumatic motor is communicated with an exhaust gas discharge pipe; the air inlet of the pneumatic motor is communicated with a compressed air pipe, and the compressed air pipe is used for filling constant-pressure high-pressure gas to push the rotary sheet of the pneumatic motor to rotate around the rotor of the pneumatic motor; the expansion cavity is a cavity structure which is changed after the rotary plate of the pneumatic motor is eccentrically arranged in the pneumatic motor, and the air is exhausted through the volume change of the expansion cavity.
6. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: the side part of the centrifugal water pump is provided with a water outlet which is communicated with a water drain pipe.
7. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: the centrifugal water pump is arranged on the base.
8. The intelligent pneumatic precipitation device for the foundation pit of the subway station as claimed in claim 1, wherein: the top of the pneumatic motor is sealed by a disk cover.
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| CN202110601520.8A CN113250222B (en) | 2021-05-31 | 2021-05-31 | Intelligent pneumatic dewatering device for subway station foundation pit |
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| CN202110601520.8A CN113250222B (en) | 2021-05-31 | 2021-05-31 | Intelligent pneumatic dewatering device for subway station foundation pit |
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| CN113250222A true CN113250222A (en) | 2021-08-13 |
| CN113250222B CN113250222B (en) | 2023-02-28 |
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Cited By (1)
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| CN114809123A (en) * | 2022-04-02 | 2022-07-29 | 中能建路桥工程有限公司 | Multi-stage support foundation pit monitoring method |
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| CN113250222B (en) | 2023-02-28 |
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