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CN-116972021-B - Pump front bottom valve and system and method for pumping liquid by adopting pump front bottom valve to connect

CN116972021BCN 116972021 BCN116972021 BCN 116972021BCN-116972021-B

Abstract

The invention discloses a front bottom valve of a pump and a system and a method for pumping liquid by adopting the front bottom valve, wherein the front bottom valve of the pump comprises a valve cover, a valve body, a piston rod and a pressing plate, the valve body is provided with a bottom valve inlet and a bottom valve outlet, a stop port is arranged between the bottom valve inlet and the bottom valve outlet, a top hollow is formed by the valve cavity by the position of the valve cover, the bottom valve inlet is connected with the top hollow through a connecting pipeline, a check valve is arranged on the connecting pipeline, and fluid can enter the top hollow from the bottom valve inlet through the check valve along the connecting pipeline. The invention solves the problem of the limitation of the prior art that the centrifugal pump is used for taking liquid at the position above the liquid level.

Inventors

  • ZHANG LEI

Assignees

  • 张磊

Dates

Publication Date
20260512
Application Date
20230801

Claims (11)

  1. 1. Method for pumping a liquid by means of a pump front bottom valve connection system for pumping a liquid, said pump front bottom valve comprising a valve cover (21), a valve body (22) with a valve cavity and a pressure plate (6) arranged in the valve cavity, said valve body (22) having a bottom valve inlet (3) and a bottom valve outlet (2), a shut-off opening (7) being arranged between the bottom valve inlet (3) and the bottom valve outlet (2), characterized in that: the pressing plate (6) is driven by a driving mechanism to close or open the cut-off opening (7); The valve cavity forms a top inner space (14) by the position of a valve cover (21), a valve II (15) is arranged at the top inner space (14) or on a first pipeline (1) connected with a bottom valve outlet (2), the bottom valve inlet (3) is connected with the top inner space (14) through a connecting pipeline (9), a check valve (8) is arranged on the connecting pipeline (9), and fluid can enter the top inner space (14) from the bottom valve inlet (3) through the check valve (8) along the connecting pipeline; The valve I (12) is arranged at the position of the bottom valve outlet (2) or on a first pipeline (1) connected with the bottom valve outlet (2); The front pump bottom valve is arranged above the liquid level, a bottom valve inlet (3) of the front pump bottom valve is communicated with one end of a second pipeline (4), the other end of the second pipeline (4) extends into the liquid (5), and a bottom valve outlet (2) of the front pump bottom valve is communicated with the inlet end of the pump (28) through a first pipeline (1); the liquid pumping method comprises the following steps: S1, driving a pressing plate (6) to seal the cut-off opening through a driving mechanism; S2, opening exhaust valves of a valve II (15) and a pump, filling liquid from a valve I (12) to enable air in a space (13) above a pressing plate (6), a first pipeline (1) and a top inner space (14) to be discharged from the exhaust valves of the valve II (15) and the pump (28), and closing the exhaust valves of the valve II (15) and the pump (28) until liquid flows out from the outlets of the exhaust valves of the valve II (15) and the pump (28); S3, closing a valve I (12) to enable the exhaust valve of a pump (28) to be filled with liquid to the space (13) above the pressing plate (6), the first pipeline (1) and the top inner space (14); S4, starting a pump (28), wherein air in the second pipeline (4) enters the upper space (13) of the pressing plate (6), the first pipeline (1) and the inner space of the pump (28) and the inner space of the top (14) of the pump (28) through a check valve (8) and a connecting pipeline (9) in the process that liquid in the pressing plate (6), the first pipeline (1) and the inner space of the top (14) of the pump (28) is conveyed by the pump (28), so that negative pressure is formed in the second pipeline (4); S5, stopping the pump (28), opening the exhaust valves of the valve II (15) and the pump (28) again, filling liquid from the valve I (12) to enable air in the space (13) above the pressing plate (6), the first pipeline (1) and the top hollow (14) to be exhausted from the exhaust valves of the valve II (15) and the pump (28), and closing the exhaust valves of the valve II (15) and the pump (28) until the exhaust valves of the valve II (15) and the pump outflow liquid; s6, closing a valve I (12) to enable an exhaust valve of a pump (28) to be filled with liquid to a space (13) above the pressing plate (6), the first pipeline (1) and the top inner space (14), and driving the pressing plate (6) to open a cut-off port through a driving mechanism; S7, starting the pump (28) again, and enabling the liquid (5) in the liquid pool to enter the pump (28) through the cutoff opening (7) so as to realize liquid conveying.
  2. 2. Method for extracting liquid according to claim 1, characterized in that the connection pipes (9) are of one or more groups.
  3. 3. Method for drawing liquid according to claim 1, characterized in that the connecting pipe (9) at the inlet end of the non-return valve (8) is provided with a valve III (16) and/or the connecting pipe (9) at the outlet end of the non-return valve (8) is provided with a valve IV (17).
  4. 4. A method according to claim 3, characterized in that the outlet end of the valve IV (17) is divided into two branches, one branch being connected to the top hollow (14) via a valve V (26) and the other branch being connected to the bottom valve outlet (2) via a connecting branch (27).
  5. 5. Method according to any of claims 1-4, characterized in that the pressure plate is connected to one end of a piston rod (20), the other end of the piston rod (20) being in contact with a flow restricting rod (11) extending through a valve cover (21), the flow restricting rod (11) being axially movable relative to the valve cover (21) and being sealed at the contact, the flow restricting rod (11) driving the piston rod (20) to close the pressure plate (6) to the shut-off opening (7).
  6. 6. The method for pumping liquid according to claim 5, wherein a piston cylinder (23) is arranged in the valve cavity, a piston ring (24) arranged on the piston rod (20) is arranged in the piston cylinder (23), a sealing ring (25) is arranged on the outer ring of the piston ring (24), and the sealing ring (25) is in static contact and sliding contact with the piston cylinder (24).
  7. 7. A method of drawing liquid according to claim 6, wherein the piston rod (20) is mounted on a holder (19), the holder (19) being arranged in the valve chamber and being fixed to the valve body (22), the piston rod (20) being slidably mounted in an up-down fit relative to the holder (19).
  8. 8. The method of pumping liquid according to any of claims 1-4, wherein the shut-off opening is arranged obliquely at an angle to the horizontal.
  9. 9. Method for drawing liquid according to any of claims 1-4, characterized in that a gate valve (29) is provided on the post-pump conduit (18) at the outlet end of the pump (28).
  10. 10. The method according to any one of claims 1-4, characterized in that after step S7, after stopping the pump (28), the pump (28) is started and stopped normally for the next use.
  11. 11. Method according to any of claims 1-4, characterized in that the pressure plate is connected to one end of a piston rod (20), the other end of the piston rod (20) being in contact with a restrictor rod (11) extending through a valve cap (21), the restrictor rod (11) being axially movable relative to the valve cap (21) and being sealed in contact, the restrictor rod (11) driving the piston rod (20) to close the pressure plate (6) to the shut-off opening (7); in the step S1, the current limiting rod (11) is driven to move downwards to enable the pressing plate (6) to seal the cut-off opening; in the step S6, the pressure plate (6) is not pressed any more by the upward movement of the flow limiting rod (11) until the pressure plate (6) can be fully opened.

Description

Pump front bottom valve and system and method for pumping liquid by adopting pump front bottom valve to connect Technical Field The invention relates to a front bottom valve of a liquid pump, a system and a method for pumping liquid by adopting the front bottom valve of the liquid pump, and belongs to the field of liquid valves. Background In the prior art, the centrifugal pump is used for conveying liquid at the position above the liquid level, and the solutions are realized in the forms of installing a bottom valve, installing a circulating pump, vacuumizing by using a vacuumizing machine, installing a water-based bottom valve and the like, but the solutions have limitations in use to different degrees. 1. Defects of installing the bottom valve: 1. When the hydraulic pump is used in a place with high lift, a water hammer can be generated in the pipeline, so that the sealing opening of the bottom valve is easy to damage, the water pump can not take water, and the safety of the pipeline is affected. 2. The bottom valve is arranged at the water suction port of the pipeline, the water outlet of the bottom valve needs to be parallel to the horizontal plane, the drag coefficient of the foot valve is large. And because the water outlet of the bottom valve needs to be parallel to the horizontal plane, sundries are easy to remain at the sealing position, and the sealing of the bottom valve is easy to cause that the water cannot be pumped. 3. Once the underwater bottom valve is out of order, maintenance or replacement is troublesome, the small pool can also be pumped away by the submersible pump, and then maintenance or replacement is difficult if the pool is large or the pool or river is required to be maintained or replaced. 2. Defects of installing a circulating pump: 1. The installation of the circulating pump for water taking, the installation of the pump, the water tank and the like are not considered in the common use. 2. The vacuum extractor is used for vacuumizing, the small vacuum extractor is used for vacuumizing to form the required diversion negative pressure, and the large vacuum extractor is not practical in many places. 3. Defects of installing a water-borne bottom valve: 1. When the water hammer is used in a place with high lift, a water hammer can be generated in the pipeline, so that the sealing opening of the water-borne bottom valve is easy to damage, the water pump can not take water, and the safety of the pipeline is affected. 2. The water-based bottom valve solves the problem of limitation of the bottom valve, the installation of the circulating pump, the use of the vacuumizing machine and the like, but the water-based bottom valve is required to be installed right above the liquid level (as shown in fig. 8), so that the installation and the maintenance are inconvenient. 3. The sealing opening of the water-based bottom valve needs to be parallel to the horizontal plane, so that the resistance coefficient of the water-based bottom valve is large, impurities are easy to remain at the sealing position because the sealing opening needs to be parallel to the horizontal plane, and the water-based bottom valve is easy to seal and cannot be pumped. 4. When the water-based bottom valve is installed, the technical requirement is that the pipeline from the water outlet of the water-based bottom valve to the water inlet of the pump is longer than the pipeline distance from the water inlet of the water-based bottom valve to the liquid level, and if the conditions are not met, the water taking of the pump becomes poor or can not be taken. Disclosure of Invention The invention aims to provide a pump front bottom valve, a system and a method for pumping liquid by adopting the pump front bottom valve, and the pump front bottom valve is matched with a pump to realize that the centrifugal pump can effectively convey liquid at the position above the liquid level, so that the problem of limitation of the centrifugal pump to liquid taking at the position above the liquid level in the prior art can be solved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: comprises a valve cover, a valve body with a valve cavity and a pressing plate arranged in the valve cavity; the valve body is provided with a bottom valve inlet and a bottom valve outlet, and a stop port is arranged between the bottom valve inlet and the bottom valve outlet; the valve cavity forms a top hollow by the position of the valve cover, and a valve II is arranged at the top hollow or on a first pipeline connected with a bottom valve outlet; The position of the bottom valve outlet or a first pipeline connected to the bottom valve outlet is provided with a valve I. According to the embodiment of the invention, the invention can be further optimized, and the following technical scheme is formed after the optimization: in one preferred embodiment, the connecting pipes are one or more than one group. In on