CN112013152A - Liquid level control valve, liquid level control system and liquid level control method - Google Patents
Liquid level control valve, liquid level control system and liquid level control method Download PDFInfo
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- CN112013152A CN112013152A CN202010777022.4A CN202010777022A CN112013152A CN 112013152 A CN112013152 A CN 112013152A CN 202010777022 A CN202010777022 A CN 202010777022A CN 112013152 A CN112013152 A CN 112013152A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of fluid delivery, in particular to a liquid level control valve, a liquid level control system and a liquid level control method. The level control valve can be arranged directly in the suction line forming the level control system or as a control valve in a pneumatic valve arranged on the suction line forming the level control system. In the invention, all the movable components are statically sealed by the rubber diaphragm so as to be completely isolated from liquid, the rotating parts cannot be blocked by fine particles to lose efficacy like a float valve, and the corrosion prevention and rust prevention are easier to arrange; the invention does not need electricity and can be used in the occasions containing combustible gas.
Description
Technical Field
The invention relates to the technical field of fluid conveying, in particular to a liquid level control valve, a liquid level control system and a liquid level control method.
Background
The liquid level control valve is widely applied to various fluid conveying occasions, and various liquid level control valves can be seen in chemical production or daily life.
The liquid level control valve is a mechanical valve, and the on-off of the valve is controlled by a floating ball arranged in a liquid storage container, such as a hydraulic water level control valve; the other type is an electronic valve, and the on-off of the valve is controlled by a liquid level sensor arranged in a liquid storage container.
However, the conventional liquid level control valve, whether a mechanical valve or an electronic valve, has a problem of reliability when used in a solid-containing liquid such as sewage. The mechanical valve can not be separated from the floating ball and the lever, has a rotating part, and is required to be contacted with solid-containing liquid, and is easy to be blocked by solid particles and can not normally run; among sensors used in electronic valves, a float-type liquid level sensor and a float-type liquid level sensor face the same problems as those of mechanical valves, static pressure type liquid level sensors and photoelectric liquid sensors are relatively precise electronic equipment, sewage contains a great amount of electrolytes and solid particles, and the precise electronic equipment is prone to failure and short in service life when operated in a humid, salt-containing and dirty environment. In addition, the automatic valve controlled by the sensor is used in sewage, so that various problems exist, the sewage is often filled with methane, and the electric valve is used to cause explosion; the pneumatic valve takes instrument wind as power, the instrument wind is pure compressed air subjected to deep dust removal, water removal and oil removal, the air is generated by special equipment with a complex structure and high price, the use cost of the air-operated valve is acceptable in occasions with a large number of pneumatic valves such as chemical plants, and the cost is overhigh in occasions with only a small number of valves.
Disclosure of Invention
The invention provides a liquid level control valve, a liquid level control system and a liquid level control method.
The technical problem to be solved is that: the conventional liquid level control valve has a problem of reliability when used in a solid-containing liquid such as sewage.
In order to solve the technical problems, the invention adopts the following technical scheme: a liquid level control valve comprises a plurality of chambers separated by partition plates, wherein each chamber is provided with a valve port which is communicated with the inside of the chamber and serves as an inlet or an outlet, the liquid level control valve is provided with a pressure guide pipe, the lower end of the pressure guide pipe is inserted into the bottom of liquid in a liquid storage container, and the on-off state of the chambers is controlled by a column piston driven by the air pressure in the pressure guide pipe.
Furthermore, the chambers in the liquid level control valve are arranged in parallel, a rubber diaphragm is arranged in the chamber at one end of each parallel chamber, the chamber provided with the rubber diaphragm is divided into two mutually isolated cavities by the rubber diaphragm, and the cavity far away from the partition plate is communicated with the pressure guide pipe; the rubber diaphragm is provided with a column piston driven by the rubber diaphragm, and the column piston penetrates through each partition plate and is in sliding connection with each partition plate.
Further, the liquid level control valve comprises a closed columnar shell, the partition plate comprises an upper partition plate and a lower partition plate which are horizontally arranged, and is divided into an upper chamber, a middle chamber and a lower chamber by the upper partition plate and the lower partition plate, a rubber diaphragm is horizontally arranged in the lower chamber, a cavity below the rubber diaphragm is communicated with the upper end of the pressure guide pipe, and a cavity between the rubber diaphragm and the lower partition plate is communicated with a valve port on the lower chamber; the outlet of the liquid level control valve is a valve port on the middle chamber, and the two inlets are valve ports on the upper chamber and the lower chamber respectively; the column piston is vertically arranged, the upper end of the column piston is abutted against the inner wall of the column-shaped shell through a pressure spring, and the lower end of the column piston is abutted against the rubber diaphragm; the plunger piston is divided into an upper piston section, a middle piston section and a lower piston section, the diameter of the middle piston section is smaller than that of the upper piston section and that of the lower piston section, when the rubber diaphragm bends upwards to the highest stroke, the middle piston section penetrates through the upper partition plate and is in clearance fit with the upper partition plate, and the lower piston section penetrates through the lower sealing plate and is in close fit with the lower sealing plate; when the rubber diaphragm bends downwards to the lowest stroke, the upper section of the piston penetrates through the upper partition plate and is tightly matched with the upper partition plate, and the middle section of the piston penetrates through the lower sealing plate and is in clearance fit with the lower sealing plate.
Further, the middle part of the upper surface of the columnar shell of the liquid level control valve is arched upwards to form a pressure spring protection cylinder, and a pressure spring at the upper end of the columnar piston is inserted into the pressure spring protection cylinder.
Furthermore, the upper end of the pressure spring protecting cylinder is communicated with the atmosphere, and the inner side wall of the pressure spring protecting cylinder is tightly matched and connected with the upper section of the piston in a sliding mode.
Further, the side surface of the lower section of the piston is sleeved with a pressure spring for preventing the column piston from bursting the rubber diaphragm, the upper end of the pressure spring sleeved on the side surface of the lower section of the piston is abutted against the lower surface of the lower partition plate, and the lower end of the pressure spring is abutted against the rubber diaphragm.
A liquid level control system driven by the energy of a medium comprises the liquid level control valve, wherein an inlet on an upper chamber of the liquid level control valve is communicated with a pipeline inserted at the bottom of liquid in a liquid storage container, an inlet on a lower chamber of the liquid level control valve is communicated with the atmosphere, and an outlet of the liquid level control valve is communicated with a suction pipeline.
A liquid level control system taking instrument wind as power comprises the liquid level control valve, a suction pipeline with an inlet end inserted at the bottom of liquid in a liquid storage container, a normally-closed valve arranged on the suction pipeline, and a pneumatic actuator connected with the normally-closed valve and used for driving the normally-closed valve; an inlet on an upper chamber of the liquid level control valve is communicated with an instrument air pipeline, an inlet on a lower chamber of the liquid level control valve is communicated with the atmosphere, and an outlet of the liquid level control valve is communicated with the pneumatic actuator.
A liquid level control system taking negative pressure as power comprises the liquid level control valve, a suction pipeline with an inlet end inserted at the bottom of liquid in a liquid storage container, and a negative pressure execution valve arranged on the suction pipeline;
the negative pressure execution valve comprises an expandable and contractible execution chamber, and an inlet and an outlet of the negative pressure execution valve are separated by the execution chamber when the execution chamber is communicated with the atmosphere and communicated with each other when the execution chamber is deflated by pumping;
an inlet on the upper cavity of the liquid level control valve is communicated with the air suction pipeline, an inlet on the lower cavity is communicated with the atmosphere, and an outlet is communicated with the execution cavity of the negative pressure execution valve.
A liquid level control method using the above liquid level control system driven by the energy of the medium itself, the above liquid level control system powered by instrument wind, or the above liquid level control system powered by negative pressure, comprising the steps of:
the method comprises the following steps: when the middle section of the piston is inserted into the upper partition plate, an inlet on the upper cavity is communicated with an outlet on the middle cavity, so that liquid pumping is started, and the liquid level in the liquid storage container is lowered;
step two: along with the decline of the liquid level in the stock solution container, the liquid level synchronous decline in the impulse pipe makes the pressure reduction in the impulse pipe, drives rubber diaphragm downwarping, and rubber diaphragm drives the post piston decline, and when piston middle section was inserted and is established in lower baffle, the export intercommunication on the entry on the lower cavity and the well cavity to stop the drawing liquid.
Compared with the prior art, the liquid level control valve, the liquid level control system and the liquid level control method have the following beneficial effects:
in the invention, the part which is in direct contact with liquid or possibly splashed is only a non-moving part such as a pipeline and a container, no moving component is provided, all the moving components are statically sealed by the rubber diaphragm so as to be completely isolated from the liquid, the rotating part cannot be blocked by fine particles to lose efficacy like a float valve, and the corrosion prevention and the rust prevention are easier to arrange;
the invention does not need electricity and can be used in the occasions containing combustible gas.
Drawings
FIG. 1 is a schematic structural view of a liquid level control valve according to the present invention in a closed state;
FIG. 2 is a schematic structural view of a liquid level control valve according to the present invention in an open state;
FIG. 3 is a schematic diagram of a fluid level control system of the present invention driven by the energy of the medium itself;
FIG. 4 is a schematic structural view of a gauge wind powered level control system of the present invention;
FIG. 5 is a schematic view of a negative pressure powered fluid level control system of the present invention;
the device comprises a liquid storage container 1, a suction pipeline 2, a control valve 3, an upper partition plate 31, a lower partition plate 32, an upper chamber 33, a middle chamber 34, a lower chamber 35, a rubber diaphragm 36, a column piston 37, a piston upper section 371, a piston middle section 372, a piston lower section 373, a pressure guide pipe 38, a pressure spring protecting cylinder 39, a pneumatic actuator 4, a normally closed valve 5 and a negative pressure executing valve 6.
Detailed Description
As shown in figures 1-2, the liquid level control valve of the present invention comprises a plurality of chambers separated by partition boards, each chamber is provided with a valve port which is communicated with the inside of the chamber and is used as an inlet or an outlet, the liquid level control valve is provided with a pressure guide pipe 38, the lower end of the pressure guide pipe 38 is inserted at the bottom of liquid in a liquid storage container 1, and the on-off state of each chamber is controlled by a column piston 37 driven by the air pressure in the pressure guide pipe 38.
The chambers in the liquid level control valve are arranged in parallel, a rubber diaphragm 36 is arranged in the chamber at one end of each parallel chamber, the chamber provided with the rubber diaphragm 36 is divided into two mutually isolated cavities by the rubber diaphragm 36, and the cavity far away from the partition plate is communicated with the pressure guide pipe 38; the rubber diaphragm 36 is provided with a column piston 37 driven by the rubber diaphragm 36, and the column piston 37 penetrates through each partition plate and is respectively connected with each partition plate in a sliding manner. Here, a rubber diaphragm 36 is used to drive the piston without the moving parts coming into contact with the liquid, as compared to a float ball in a float valve.
One preferred structure of the liquid level control valve is as follows:
the liquid level control valve comprises a closed columnar shell, the partition plate comprises an upper partition plate 31 and a lower partition plate 32 which are horizontally arranged, the upper partition plate 31 and the lower partition plate 32 are divided into an upper chamber 33, a middle chamber 34 and a lower chamber 35, a rubber diaphragm 36 is horizontally arranged in the lower chamber 35, a cavity below the rubber diaphragm 36 is communicated with the upper end of a pressure guide pipe 38, and a cavity between the rubber diaphragm 36 and the lower partition plate 32 is communicated with a valve port on the lower chamber 35; the outlet of the liquid level control valve is a valve port on the middle chamber 34, and the two inlets are valve ports on the upper chamber 33 and the lower chamber 35 respectively;
the rising of the liquid level in the liquid storage container 1 can compress the air in the pressure guide pipe 38, so that the pressure of the air rises, the rubber diaphragm 36 is pushed to rise, the cavity between the rubber diaphragm 36 and the lower sealing partition plate is communicated with the atmosphere, otherwise, the rising of the rubber diaphragm 36 can compress the air in the cavity above the rubber diaphragm 36, and the rising of the rubber diaphragm 36 is blocked; note that the rubber diaphragm 36 cannot be replaced with a piston, and the rubber diaphragm 36 may come into contact with the solid-containing liquid and may be caught by particles in the solid-containing liquid if replaced with a piston.
The column piston 37 is vertically arranged, the upper end of the column piston is propped against the inner wall of the column-shaped shell through a pressure spring, and the lower end of the column piston is propped against the rubber diaphragm 36; the plunger 37 is divided into three sections, i.e., an upper section 371 of the piston, a middle section 372 of the piston, and a lower section 373 of the piston, wherein the diameter of the middle section 372 of the piston is smaller than the upper section 371 of the piston and the lower section 373 of the piston, as shown in fig. 2, when the rubber diaphragm 36 bends upward to the highest stroke, the middle section 372 of the piston penetrates through the upper partition plate 31 and is in clearance fit with the upper partition plate 31, and the lower section 373 of the piston penetrates through the lower seal plate and is in close fit with the; as shown in fig. 1, when the rubber diaphragm 36 bends downward to the lowest stroke, the piston upper section 371 penetrates through the upper partition plate 31 and is tightly fitted with the upper partition plate 31, and the piston middle section 372 penetrates through the lower sealing plate and is in clearance fit with the lower sealing plate.
The middle part of the upper surface of the cylindrical shell of the liquid level control valve is arched upwards to form a pressure spring protection cylinder 39, and a pressure spring at the upper end of the cylindrical piston 37 is inserted into the pressure spring protection cylinder 39. The main function of the spring sheath is to prevent the compression spring from being askew.
The upper end of the pressure spring protecting cylinder 39 is communicated with the atmosphere, and the inner side wall is closely matched and connected with the piston upper section 371 in a sliding way. The purpose of the upper end of the pressure spring casing 39 being in communication with the atmosphere here is to keep the upper end of the column piston 37 at a constant pressure, thereby avoiding the pressure in the liquid level control valve from affecting the movement of the column piston 37.
The side surface of the lower piston section 373 is sleeved with a compression spring for preventing the plunger 37 from bursting the rubber diaphragm 36, the upper end of the compression spring sleeved on the side surface of the lower piston section 373 is abutted against the lower surface of the lower partition plate 32, and the lower end of the compression spring is abutted against the rubber diaphragm 36. Note that the compression spring here, as well as the compression spring at the upper end of the plunger 37, should be a softer spring, because the pressure difference caused by the rising liquid level is smaller, and if the spring is too hard, the movement of the plunger 37 will be affected.
The liquid level control valve is used for liquid level control, and the following three possible schemes are available:
as shown in fig. 3, the liquid level control system driven by the energy of the medium itself comprises the liquid level control valve, wherein the inlet of the upper chamber 33 of the liquid level control valve is communicated with a pipeline inserted at the bottom of the liquid in the liquid storage container 1, the inlet of the lower chamber 35 is communicated with the atmosphere, and the outlet is communicated with the suction pipeline 2. However, the liquid level control system driven by the energy of the medium itself as shown in fig. 3 is not suitable for use in a large flow pipeline, and must have a pressure spring casing 39 with an upper end communicating with the atmosphere and an inner side wall closely fitted and slidably connected to the piston upper section 371.
The liquid level control system is similar to an automatic valve, does not depend on external energy such as instrument wind or electricity and is driven by the energy of the medium.
The operation process comprises the following steps:
the method comprises the following steps: when the liquid level in the liquid storage container 1 rises, the liquid level in the pressure guide pipe 38 rises synchronously, so that the air pressure in the pressure guide pipe 38 rises to drive the rubber diaphragm 36 to bend upwards, the rubber diaphragm 36 drives the column piston 37 to rise, and when the piston middle section 372 is inserted in the upper partition plate 31, an inlet on the upper chamber 33 is communicated with an outlet on the middle chamber 34, so that the suction pipeline 2 is communicated with the liquid in the liquid storage container 1, liquid suction is started, and the liquid level in the liquid storage container 1 falls;
step two: along with the liquid level in the liquid storage container 1 descending, the liquid level in the pressure guide pipe 38 synchronously descends, so that the air pressure in the pressure guide pipe 38 is reduced, the rubber diaphragm 36 is driven to bend downwards, the rubber diaphragm 36 drives the column piston 37 to descend, when the piston middle section 372 is inserted in the lower partition plate 32, the inlet on the lower chamber 35 is communicated with the outlet on the middle chamber 34, the suction pipeline 2 is communicated with the atmosphere, and liquid suction is stopped.
As shown in fig. 4, a liquid level control system powered by instrument wind includes the above liquid level control valve, a suction pipeline 2 with an inlet end inserted into the bottom of liquid in a liquid storage container 1, a normally closed valve 5 arranged on the suction pipeline 2, and a pneumatic actuator 4 connected to the normally closed valve 5 and used for driving the normally closed valve 5; an inlet on an upper chamber 33 of the liquid level control valve is communicated with an instrument air pipeline, an inlet on a lower chamber 35 of the liquid level control valve is communicated with the atmosphere, and an outlet of the liquid level control valve is communicated with the pneumatic actuator 4. Similarly, the gauge wind powered level control system shown in FIG. 4 must have a pressure spring casing 39 with an upper end in communication with the atmosphere and an inner sidewall closely fitted and slidably connected to the piston upper section 371.
The operation process comprises the following steps:
the method comprises the following steps: when the liquid level in the liquid storage container 1 rises, the liquid level in the pressure guide pipe 38 rises synchronously, so that the air pressure in the pressure guide pipe 38 rises to drive the rubber diaphragm 36 to bend upwards, the rubber diaphragm 36 drives the column piston 37 to rise, and when the piston middle section 372 is inserted in the upper partition plate 31, an inlet on the upper chamber 33 is communicated with an outlet on the middle chamber 34, so that the pneumatic actuator 4 is communicated with an instrument air pipeline, and the normally-closed valve 5 is opened to start liquid pumping, so that the liquid level in the liquid storage container 1 falls;
step two: along with the liquid level in the liquid storage container 1 descending, the liquid level in the pressure guide pipe 38 synchronously descends, so that the air pressure in the pressure guide pipe 38 is reduced, the rubber diaphragm 36 is driven to bend downwards, the rubber diaphragm 36 drives the column piston 37 to descend, when the piston middle section 372 is inserted in the lower partition plate 32, an inlet on the lower chamber 35 is communicated with an outlet on the middle chamber 34, the pneumatic actuator 4 is communicated with the atmosphere, residual gas in the pneumatic actuator 4 is discharged, the normally-closed valve 5 is closed, and liquid pumping is stopped.
As shown in fig. 5, a liquid level control system powered by negative pressure comprises the above liquid level control valve, a suction pipeline 2 with an inlet end inserted into the bottom of liquid in a liquid storage container 1, and a negative pressure execution valve 6 arranged on the suction pipeline 2;
the negative pressure execution valve 6 comprises an expandable and contractible execution chamber, and the inlet and the outlet of the negative pressure execution valve 6 are separated by the execution chamber when the execution chamber is communicated with the atmosphere and communicated with each other when the execution chamber is deflated by pumping;
the inlet of the upper chamber 33 of the liquid level control valve is communicated with the air suction pipeline, the inlet of the lower chamber 35 is communicated with the atmosphere, and the outlet is communicated with the execution chamber of the negative pressure execution valve 6. Similarly, a negative pressure powered fluid level control system such as that shown in FIG. 5 must have a compression spring shroud 39 with an upper end in communication with the atmosphere and an inner sidewall in close fitting sliding engagement with the piston upper section 371.
The operation process comprises the following steps:
the method comprises the following steps: when the liquid level in the liquid storage container 1 rises, the liquid level in the pressure guide pipe 38 rises synchronously, so that the air pressure in the pressure guide pipe 38 rises to drive the rubber diaphragm 36 to bend upwards, the rubber diaphragm 36 drives the column piston 37 to rise, and when the piston middle section 372 is inserted in the upper partition plate 31, an inlet on the upper chamber 33 is communicated with an outlet on the middle chamber 34, so that the execution chamber is communicated with the air suction pipeline, the negative pressure execution valve 6 is opened, liquid suction is started, and the liquid level in the liquid storage container 1 falls;
step two: along with the liquid level in the liquid storage container 1 descending, the liquid level in the pressure guide pipe 38 synchronously descends, so that the air pressure in the pressure guide pipe 38 is reduced, the rubber diaphragm 36 is driven to bend downwards, the rubber diaphragm 36 drives the column piston 37 to descend, when the piston middle section 372 is inserted in the lower partition plate 32, an inlet on the lower chamber 35 is communicated with an outlet on the middle chamber 34, the execution chamber is communicated with the atmosphere, the negative pressure execution valve 6 is closed, and liquid pumping is stopped.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A liquid level control valve characterized by: the liquid level control valve comprises a plurality of chambers separated by partition plates, wherein each chamber is provided with a valve port which is communicated with the inside of the chamber and is used as an inlet or an outlet, the liquid level control valve is provided with a pressure guide pipe (38), the lower end of the pressure guide pipe (38) is inserted into the bottom of liquid in the liquid storage container (1), and the on-off state of the chambers is controlled by a column piston (37) driven by the air pressure in the pressure guide pipe (38).
2. A liquid level control valve as defined in claim 1, wherein: the chambers in the liquid level control valve are arranged in parallel, a rubber diaphragm (36) is arranged in the chamber at one end of each parallel chamber, the chamber provided with the rubber diaphragm (36) is divided into two mutually isolated cavities by the rubber diaphragm (36), and the cavity far away from the partition plate is communicated with the pressure guide pipe (38); the rubber diaphragm (36) is provided with a column piston (37) driven by the rubber diaphragm (36), and the column piston (37) penetrates through each partition plate and is in sliding connection with each partition plate.
3. A liquid level control valve as defined in claim 2, wherein: the liquid level control valve comprises a sealed cylindrical shell, the partition plate comprises an upper partition plate (31) and a lower partition plate (32) which are horizontally arranged, the upper partition plate (31) and the lower partition plate (32) are divided into an upper chamber (33), a middle chamber (34) and a lower chamber (35), a rubber diaphragm (36) is horizontally arranged in the lower chamber (35), a cavity below the rubber diaphragm (36) is communicated with the upper end of a pressure guide pipe (38), and a cavity between the rubber diaphragm (36) and the lower partition plate (32) is communicated with a valve port in the lower chamber (35); the outlet of the liquid level control valve is a valve port on the middle chamber (34), and the two inlets are valve ports on the upper chamber (33) and the lower chamber (35) respectively; the column piston (37) is vertically arranged, the upper end of the column piston is propped against the inner wall of the columnar shell through a pressure spring, and the lower end of the column piston is propped against the rubber diaphragm (36); the plunger piston (37) is divided into an upper piston section (371), a middle piston section (372) and a lower piston section (373), the diameter of the middle piston section (372) is smaller than that of the upper piston section (371) and that of the lower piston section (373), when the rubber diaphragm (36) bends upwards to the maximum height, the middle piston section (372) penetrates through the upper partition plate (31) and is in clearance fit with the upper partition plate (31), and the lower piston section (373) penetrates through the lower sealing plate and is in close fit with the lower sealing plate; when the rubber diaphragm (36) bends downwards to the lowest stroke, the upper section (371) of the piston penetrates through the upper partition plate (31) and is tightly matched with the upper partition plate (31), and the middle section (372) of the piston penetrates through the lower sealing plate and is in clearance fit with the lower sealing plate.
4. A liquid level control valve as defined in claim 3, wherein: the middle part of the upper surface of the cylindrical shell of the liquid level control valve is arched upwards to form a pressure spring protection cylinder (39), and a pressure spring at the upper end of the cylindrical piston (37) is inserted into the pressure spring protection cylinder (39).
5. A liquid level control valve as defined in claim 4, wherein: the upper end of the pressure spring protecting cylinder (39) is communicated with the atmosphere, and the inner side wall is tightly matched and connected with the upper section (371) of the piston in a sliding mode.
6. A fluid level control valve as defined in claim 5, wherein: the side surface of the lower piston section (373) is sleeved with a compression spring for preventing the column piston (37) from bursting the rubber diaphragm (36), the upper end of the compression spring sleeved on the side surface of the lower piston section (373) is abutted against the lower surface of the lower partition plate (32), and the lower end of the compression spring is abutted against the rubber diaphragm (36).
7. A liquid level control system driven by the energy of a medium itself, characterized in that: comprising a level control valve according to any of claims 5 to 6, the inlet of the upper chamber (33) of which communicates with a conduit inserted in the bottom of the liquid in the reservoir (1), the inlet of the lower chamber (35) communicating with the atmosphere and the outlet communicating with the suction conduit (2).
8. The utility model provides an use liquid level control system of instrument wind as power which characterized in that: comprises a liquid level control valve according to any one of claims 5 to 6, a suction pipeline (2) with an inlet end inserted at the bottom of liquid in the liquid storage container (1), a normally-closed valve (5) arranged on the suction pipeline (2), and a pneumatic actuator (4) connected with the normally-closed valve (5) and used for driving the normally-closed valve (5); an inlet on an upper chamber (33) of the liquid level control valve is communicated with an instrument air pipeline, an inlet on a lower chamber (35) of the liquid level control valve is communicated with the atmosphere, and an outlet of the liquid level control valve is communicated with the pneumatic actuator (4).
9. A liquid level control system taking negative pressure as power is characterized in that: comprises a liquid level control valve according to any one of claims 5 to 6, a suction pipeline (2) with an inlet end inserted into the bottom of the liquid in the liquid storage container (1), and a negative pressure execution valve (6) arranged on the suction pipeline (2);
the negative pressure execution valve (6) comprises an expandable and contractible execution chamber, and the inlet and the outlet of the negative pressure execution valve (6) are separated by the execution chamber when the execution chamber is communicated with the atmosphere and communicated with each other when the execution chamber is deflated by suction;
an inlet on the upper chamber (33) of the liquid level control valve is communicated with the air suction pipeline, an inlet on the lower chamber (35) is communicated with the atmosphere, and an outlet is communicated with the execution chamber of the negative pressure execution valve (6).
10. A method of controlling a liquid level, comprising: the liquid level control method uses a liquid level control system driven by the energy of the medium itself as claimed in claim 7, a liquid level control system powered by instrument wind as claimed in claim 8, or a liquid level control system powered by negative pressure as claimed in claim 9, and comprises the steps of:
the method comprises the following steps: the liquid level in the liquid storage container (1) rises, the liquid level in the pressure guide pipe (38) rises synchronously, the air pressure in the pressure guide pipe (38) rises, the rubber diaphragm (36) is driven to bend upwards, the rubber diaphragm (36) drives the column piston (37) to rise, when the piston middle section (372) is inserted in the upper partition plate (31), the inlet on the upper cavity (33) is communicated with the outlet on the middle cavity (34), so that liquid pumping is started, and the liquid level in the liquid storage container (1) falls;
step two: along with the liquid level in the liquid storage container (1) descends, the liquid level in the pressure guide pipe (38) descends synchronously, the air pressure in the pressure guide pipe (38) is reduced, the rubber diaphragm (36) is driven to bend downwards, the rubber diaphragm (36) drives the column piston (37) to descend, when the piston middle section (372) is inserted in the lower partition plate (32), the inlet on the lower cavity (35) is communicated with the outlet on the middle cavity (34), and therefore liquid pumping is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777022.4A CN112013152B (en) | 2020-08-05 | 2020-08-05 | Liquid level control valve, liquid level control system and liquid level control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777022.4A CN112013152B (en) | 2020-08-05 | 2020-08-05 | Liquid level control valve, liquid level control system and liquid level control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112013152A true CN112013152A (en) | 2020-12-01 |
| CN112013152B CN112013152B (en) | 2022-03-15 |
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| CN202010777022.4A Active CN112013152B (en) | 2020-08-05 | 2020-08-05 | Liquid level control valve, liquid level control system and liquid level control method |
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