CN115596883A - Self-operated pump control valve for pipeline - Google Patents

Abstract

The invention discloses a self-operated pump control valve for a pipeline, which comprises: the valve body is provided with a main channel for liquid circulation and a pressure relief channel communicated with the main channel, and a main valve plate for controlling the on-off of the main channel is arranged in the main channel; the control rod penetrates through the pressure relief channel, and the bottom end of the control rod enters the main channel; the top of the control rod is connected with a control assembly for driving the control rod to lift, and the middle part of the control rod is provided with an auxiliary valve plate; the main valve plate has a full-closed position and a full-open position, and when moving from the full-closed position to the full-open position, the main valve plate can drive the control rod to ascend; when the main valve plate is located at the full-open position or the full-closed position, the auxiliary valve plate can cut off the communication between the main channel and the pressure relief channel. The pipeline self-operated pump control valve provided by the embodiment of the invention has the advantages of simple structure, few structural parts in a flow channel and convenience in maintenance, and can automatically release pressure through the bypass valve in the pump starting and stopping stages, so that the water hammer for starting and stopping the pump is reduced, and the risk of reversing the water pump when the pump is stopped is eliminated.

Description

Self-operated pump control valve for pipeline

Technical Field

The invention relates to the technical field of pipeline control valves, in particular to a pipeline self-powered pump control valve.

Background

The present setting is used for the check valve series product of non return and subduct the water hammer at the pump export, no matter is conventional butterfly slowly closes the check valve, still ends formula or the multi-functional pump accuse valve of butterfly, all adopts earlier to close fast in the main pipe and cuts most backward flow water, slowly closes the mode of releasing reflux pressure again, and non return when realizing the pump cut down with the water hammer, closes the form through veneer two stages or two stages of double valve boards and realizes. In the slow closing process, a high-pressure medium at the outlet end of the valve flows back at high speed from the outlet of the water pump to the inlet of the water pump in the pipeline, and in the mode, the backflow medium still pushes the water pump to rotate reversely, even the water pump enters a water turbine power generation mode, so that the risk of damaging the water pump and a motor is caused.

The existing check valve series products mainly pay attention to the water hammer for stopping the pump, do not pay attention to the water hammer for starting the pump, and have accidents of expansion joint disconnection, pipeline displacement and the like caused by the water hammer for starting the pump in the actual operation process of starting the pump. Meanwhile, the existing stop-type or butterfly-type multifunctional pump control valve has the problems of more complex valve body flow channel, more structural parts in the flow channel, difficulty in maintenance and high water loss of the valve.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the pipeline self-operated pump control valve which is simple in structure and convenient to overhaul and maintain; the structural parts in the flow channel are few, and the loss of overflowing water is low; in the stages of starting and stopping the pump, the bypass valve can automatically release pressure to reduce the water hammer for starting and stopping the pump, thereby effectively avoiding the risk of reversing the water pump when the pump is stopped.

According to the embodiment of the invention, the pipeline self-powered pump control valve comprises: the valve body is provided with a main channel for liquid circulation and a pressure relief channel communicated with the main channel, and a main valve plate for controlling the on-off of the main channel is arranged in the main channel; the control rod penetrates through the pressure relief channel, and the bottom end of the control rod enters the main channel; the top of the control rod is connected with a control assembly for driving the control rod to lift, and the middle part of the control rod is provided with an auxiliary valve plate; the main valve plate is provided with a full-closed position and a full-open position, and when moving from the full-closed position to the full-open position, the main valve plate can drive the control rod to ascend; when the main valve plate is located at the full-open position or the full-close position, the auxiliary valve plate can cut off the communication between the main channel and the pressure relief channel.

The pipeline self-operated pump control valve provided by the embodiment of the invention at least has the following beneficial effects:

by arranging the pressure relief channel communicated with the main channel, pressure can be automatically released outwards through the pressure relief channel in the stages of starting and stopping the pump, so that water hammer generated in the process of starting and stopping the pump is reduced, and the risk of reversing the water pump in the process of stopping the pump is avoided; the pressure relief channel has few structural parts and a simple internal structure of the valve body, can effectively prolong the service life and reduce the production cost; the control assembly is positioned outside the valve body, so that online maintenance is facilitated.

According to some embodiments of the invention, the pressure relief channel comprises:

the liquid inlet cavity is provided with a liquid inlet communicated with the main channel;

the liquid outlet cavity is provided with a liquid outlet;

the volume cavity is arranged between the liquid inlet cavity and the liquid outlet cavity to be communicated with the liquid inlet cavity and the liquid outlet cavity, and the auxiliary valve plate is movable in the volume cavity.

According to some embodiments of the present invention, a lower valve seat is disposed at a connection point of the volume chamber and the liquid inlet chamber, an upper valve seat is disposed at a connection point of the volume chamber and the liquid outlet chamber, and when the main valve plate is located at a fully closed position, the auxiliary valve plate abuts against the lower valve seat to cut off communication between the volume chamber and the liquid inlet chamber; when the main valve plate is located at the full-open position, the auxiliary valve plate is abutted to the upper valve seat so as to cut off the communication between the volume cavity and the liquid outlet cavity.

According to some embodiments of the invention, the control assembly comprises:

a cavity container, the interior of which is provided with an inner cavity;

the lifting structure is movably arranged in the inner cavity in a lifting way; the top end of the control rod is connected with the lifting structure.

According to some embodiments of the invention, the elevating structure divides the interior chamber into an upper chamber and a lower chamber, the main channel having an inlet end and an outlet end, the lower chamber is communicated with the inlet end of the main channel, and the upper chamber is communicated with the outlet end of the main channel.

According to some embodiments of the invention, the main valve plate has a water-facing surface facing the inlet end and a water-facing surface provided with a projection projecting from its surface, the bottom of the control rod abutting against the projection when the main valve plate is in the fully closed position.

According to some embodiments of the invention, the top of the valve body is provided with a stop ring extending upwards into the lower chamber, and a central passage communicating the lower chamber and the liquid outlet chamber is arranged in the central position of the stop ring.

According to some embodiments of the invention, the bottom of the central passage is provided with a centrally extending annular plate, and the control rod is arranged in the central passage in a penetrating manner and is connected with the annular plate in a sealing manner.

According to some embodiments of the invention, the top of the control rod is provided with a radially protruding buffer shaft step which can be embedded in the central channel and is in sealing connection with the inner side wall of the central channel so as to form a buffer cavity between the bottom of the buffer shaft step and the top of the annular plate; the buffer cavity is communicated with the inlet end of the main channel and is used for slowing down the descending speed of the control rod.

According to some embodiments of the invention, the main valve plate is in an inclined state when in the fully closed position.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic view of the positions of various components of a main valve plate in a fully closed position according to a novel embodiment of the present invention;

fig. 2 is a schematic diagram of the positions of the components when the pump is started according to the novel embodiment of the present invention;

FIG. 3 is a schematic view of the positions of the components when the main valve plate is partially open according to a novel embodiment of the present invention;

FIG. 4 is a schematic diagram of the position of the components of the main valve plate in the fully open position according to one embodiment of the present invention;

fig. 5 is a schematic diagram illustrating the positions of various components when the pump is stopped according to the novel embodiment of the present invention;

fig. 6 is a schematic diagram illustrating positions of components in a control rod resetting process according to a novel embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a control assembly according to another embodiment of the present invention;

FIG. 8 is an enlarged view taken at A in FIG. 6;

fig. 9 is an enlarged view at B in fig. 6.

Reference numerals:

the valve comprises a valve body 100, a main valve body 101, a pressure relief valve body 102, a main channel 110, an inlet end 111, an outlet end 112, a pressure relief channel 120, a liquid inlet cavity 121, a liquid outlet cavity 122, a volume cavity 123, an upper valve seat 124, a lower valve seat 125, a main valve plate 130, a water facing surface 131, a water backing surface 132, a bump 133, a stop ring 140, a buffer cavity 141 and an annular plate 150;

control rod 200, sub valve plate 210, buffer shaft step 220;

the control assembly 300, the chamber container 310, the upper chamber 311, the lower chamber 312, the lifting structure 320, the first communication pipe 330, the second communication pipe 340, the buffer pipe 341, and the quick closing pipe 342.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 9, a self-powered pump control valve for a pipeline according to an embodiment of the present invention includes a valve body 100 and a control rod 200 vertically inserted into the valve body 100.

The valve body 100 has a main channel 110 for liquid to flow through and a pressure relief channel 120 communicated with the main channel 110, and a main valve plate 130 for controlling the on-off of the main channel 110 is installed in the main channel 110; specifically, referring to fig. 1, the valve body 100 includes a main valve body 101 and a pressure relief valve body 102, and the pressure relief valve body 102 is installed above the main valve body 101; an opening is arranged above the main valve body 101, and part of the pressure relief valve body 102 is inserted into the main valve body 101 and connected with the main valve body 101. The main passage 110 is disposed in the main valve body 101, and the relief passage 120 is disposed in the relief valve body 102. The control rod 200 passes through the relief passage 120 and bottom into the main passage 110. The top of the control rod 200 is connected with a control assembly 300 for driving the control rod to ascend and descend, and the middle part of the control rod is provided with an auxiliary valve plate 210.

The main valve plate 130 has a fully closed position and a fully opened position, and when the main valve plate 130 moves from the fully closed position to the fully opened position, the control rod 200 can be driven to ascend; when the main valve plate 130 is in the fully open position or the fully closed position, the sub valve plate 210 can block the communication between the main passage 110 and the relief passage 120. Specifically, the main passage 110 has an inlet end 111 and an outlet end 112, a fully closed position, i.e., the main valve plate 130, is located at a position where communication between the inlet end 111 and the outlet end 112 is completely cut off, and a fully opened position, i.e., the main valve plate 130, is located at a position where a communication area between the inlet end 111 and the outlet end 112 is maximized.

In some embodiments of the present invention, the main valve plate 130 adopts a wing-like section structure, and the specific structure thereof can refer to a wing-like section butterfly plate with application number CN202021593298.9, and the wing-like design can effectively reduce the head loss after the liquid flows through the valve. The valve body 100 is provided with a valve shaft rotating around the axis thereof, and the main valve plate 130 is connected with the valve shaft in a transmission way. It should be noted that the connection point of the valve shaft and the main valve plate 130 is not located at the center of the main valve plate 130, but is connected to a position above the center of the main valve plate 130. For convenience of expression, the valve shaft is taken as a dividing line to divide the main valve plate 130 into a narrow area and a wide area; referring to FIG. 1, the main valve plate 130 is now in the fully closed position, with the narrow land above the valve shaft and the wide land below the valve shaft. When the main valve plate 130 is in the fully closed position, the main valve plate 130 is in the inclined state, the narrow area is closer to the inlet end 111, and the wide area is closer to the outlet end 112, when the pump is started, the water flow pressure will push the wide area of the main valve plate 130 to rotate clockwise (clockwise in the drawing) around the valve shaft, so as to drive the main valve plate 130 to move from the fully closed position to the fully open position.

In some embodiments of the present invention, the main valve plate 130 has a water-facing surface 131 and a water-facing surface 132, the water-facing surface 131 faces the inlet end 111, the water-facing surface 132 is provided with a projection 133 protruding from the surface thereof, and the bottom of the control rod 200 abuts against the projection 133 when the main valve plate 130 is in the fully closed position. Specifically, the valve shaft is also attached to the backing surface 132 of the main valve plate 130. The main valve plate 130 has a cross-section of a wing shape, and when the main valve plate 130 is at a full open position, head loss caused by the flow of the liquid medium can be effectively reduced.

Further, the abutting structure of the bottom end of the control rod 200 and the projection 133 may be provided in various forms, such as: a ball end form, a roller form, a living hinge form, etc.; the main design concept is to ensure that the control rod 200 bears axial thrust as much as possible, and little or no radial thrust that would produce bending moments, when the control rod 200 abuts the projection 133 to limit the opening speed of the main valve plate 130.

In some embodiments of the present invention, pressure relief channel 120 comprises:

a liquid inlet chamber 121 provided with a liquid inlet communicated with the main channel 110;

a liquid outlet cavity 122 provided with a liquid outlet;

and the volume cavity 123 is arranged between the liquid inlet cavity 121 and the liquid outlet cavity 122 to communicate the liquid inlet cavity 121 and the liquid outlet cavity 122, and the auxiliary valve plate 210 is movably arranged in the volume cavity 123. The volume chamber 123 is disposed above the liquid inlet chamber 121, and the liquid outlet chamber 122 is disposed above the volume chamber 123.

Specifically, referring to fig. 1 and 9, a lower valve seat 125 is disposed at a connection between the volume cavity 123 and the liquid inlet cavity 121, an upper valve seat 124 is disposed at a connection between the volume cavity 123 and the liquid outlet cavity 122, and when the main valve plate 130 is located at the fully closed position, the auxiliary valve plate 210 abuts against the lower valve seat 125 to cut off the communication between the volume cavity 123 and the liquid inlet cavity 121; when main valve plate 130 is in the fully open position, sub-valve plate 210 abuts against upper valve seat 124 to block communication between volume chamber 123 and liquid outlet chamber 122. The upper valve seat 124 and the lower valve seat 125 are each provided with a through hole through which the control rod 200 passes, and the inner diameter of the through hole is larger than the diameter of the control rod 200, but the diameter of the sub-valve plate 210 is larger than the inner diameter of the through hole.

Further, the sub-valve plate 210 is fixedly connected with the control rod 200, and when the main valve plate 130 is located at the fully closed position, the lower surface of the sub-valve plate 210 abuts against and is in sealed connection with the upper surface of the lower valve seat 125, so as to cut off the communication between the volume cavity 123 and the liquid inlet cavity 121; when main valve plate 130 is in the fully open position, the upper surface of sub-valve plate 210 abuts against and is sealingly connected to the lower surface of upper seat 124, so as to block communication between volume chamber 123 and liquid outlet chamber 122. When the sub-valve plate 210 is positioned between the upper valve seat 124 and the lower valve seat 125, the liquid inlet chamber 121 is communicated with the liquid outlet chamber 122, and the liquid medium in the main passage 110 can enter the liquid inlet chamber 121 and flow out from the liquid outlet chamber 122.

In some embodiments of the present invention, referring to fig. 9, the liquid inlet of the liquid inlet chamber 121 is horizontally disposed, and the bottom of the liquid inlet chamber 121 is in sealing contact with the outer circumferential surface of the control rod 200. The outlet of the outlet chamber 122 may be connected directly to a drain pipe of a trench, or may be connected to the inlet end 111 of the main channel 110, or may be returned to the water pump inlet sump via a pipe, so as to avoid waste due to discharge of the medium.

In some embodiments of the present invention, the control assembly 300 comprises:

a cavity container 310 having an inner cavity therein;

the lifting structure 320 is movably arranged in the inner cavity in a lifting way; the top end of the control rod 200 is connected with the lifting structure 320.

In some embodiments of the present invention, the elevating structure 320 divides the inner cavity into an upper chamber 311 and a lower chamber 312, the lower chamber 312 is in communication with the inlet end 111 of the main channel 110, and the upper chamber 311 is in communication with the outlet end 112 of the main channel 110. Due to the separation of the elevating structure 320, the upper chamber 311 and the lower chamber 312 are not communicated. The upper chamber 311 is communicated with the outlet end 112 of the main passage 110 through a first communication pipe 330, the lower chamber 312 is communicated with the inlet end 111 of the main passage 110 through a second communication pipe 340, and devices such as a flow restriction valve are provided on both the first communication pipe 330 and the second communication pipe 340.

In the first embodiment of the present invention, referring to fig. 1 to 6, the chamber container 310 is an upper cover plate and a lower cover plate which are connected by bolts, the lifting structure 320 is a diaphragm, the periphery of the diaphragm is disposed between the upper cover plate and the lower cover plate, and the top end of the control rod 200 is connected to the center position of the diaphragm. When the medium pressure in the upper chamber 311 is greater than the medium pressure in the lower chamber 312, the diaphragm is driven to elastically deform and move downward, so as to drive the control rod 200 to descend; when the pressure of the medium in the lower chamber 312 is greater than the pressure of the medium in the upper chamber 311, the diaphragm is driven to elastically deform and move upward, so as to drive the control rod 200 to ascend.

In the first embodiment of the present invention, referring to fig. 7, the chamber container 310 is a piston cylinder, the lifting structure 320 is a piston head movably and liftably mounted in the piston cylinder, the outer peripheral wall of the piston head is hermetically connected with the inner side wall of the piston cylinder, and the top end of the control rod 200 is connected with the central position of the piston head. When the medium pressure in the upper chamber 311 is greater than the medium pressure in the lower chamber 312, the piston head is driven to descend along the wall of the piston cylinder, and the control rod 200 is driven to descend; when the pressure of the medium in the lower chamber 312 is greater than the pressure of the medium in the upper chamber 311, the piston head is driven to rise along the wall of the piston cylinder, and the control rod 200 is driven to rise.

It is contemplated that the chamber container 310 and the elevating structure 320 are not limited to the above two embodiments, and may be a structure similar to the above, in which the control rod 200 is driven to be elevated by the volume change.

In some embodiments of the invention, the top of the valve body 100 is provided with a stop ring 140 that extends upwardly into the lower chamber 312. Specifically, the stop ring 140 is disposed on the top of the relief valve body 102. Referring to fig. 1, the stop ring 140 is cylindrical and has a vertical axis, the central position of the stop ring 140 penetrates through the central passage, the central passage communicates with the lower chamber 312 and the liquid outlet chamber 122, the bottom of the central passage is provided with a ring plate 150 extending toward the center, and the control rod 200 penetrates through the central passage and is connected with the ring plate 150 in a sealing manner.

Referring to fig. 8, the annular plate 150 is disposed at the bottom of the central passage, and the annular plate 150 is sealingly connected to the outer peripheral wall of the control lever 200. When the control rod 200 is lifted relative to the annular plate 150, the control rod 200 and the annular plate 150 are always sealed, so that the medium in the liquid outlet cavity 122 cannot enter the lower cavity 312.

Referring to FIG. 8, in some embodiments of the present invention, the top of the control rod 200 is provided with a radially protruding buffer step 220, and the buffer step 220 can be inserted into the central channel and is hermetically connected with the inner sidewall of the central channel to form a buffer chamber 141 between the bottom of the buffer step 220 and the top of the annular plate 150; the buffer chamber 141 communicates with the inlet end 111 of the main passage 110 for slowing down the descending speed of the lever 200. Specifically, the buffering step 220 is disposed at the top of the control rod 200, and the outer diameter of the buffering step 220 is larger than the diameter of the control rod 200 at other positions. The inner diameter of the central passage is not smaller than the diameter of the buffer step 220. When the buffer shaft step 220 enters the central passage, the outer peripheral wall of the buffer shaft step 220 is in sealing contact with the inner side wall of the central passage, so that a buffer cavity 141 is formed between the bottom of the annular plate 150, the bottom of the buffer shaft step 220, and the outer peripheral wall of the control rod 200 and the inner side wall of the central passage.

As can be seen from the above, the lower chamber 312 is communicated with the inlet end 111 of the main channel 110 through the second communication pipe 340, but it should be understood that, referring to fig. 1 to 7, one end of the second connection pipe is communicated with the inlet end 111 of the main channel 110, and the other end is provided with two branch pipes, namely, a buffer pipe 341 and a quick-closing pipe 342, the buffer pipe 341 is communicated with the buffer chamber 141, and the quick-closing pipe 342 is communicated with the lower chamber 312 at the periphery of the annular plate 150. The diameter of the buffer tube 341 should be smaller than that of the quick-closing tube 342, so that the buffer chamber 141 cannot be quickly decompressed, thereby greatly limiting the descending speed of the control rod 200 when the control rod 200 descends.

The working process of the pipeline self-powered pump control valve provided by the embodiment of the invention is as follows:

1. referring to FIG. 1, the main valve plate 130 is in a fully closed position before the self-powered pump-controlled valve of FIG. 1 is in an initial state, i.e., before the pump has not been activated to supply media into the pipe; at this time, the bottom of the control rod 200 abuts against the projection 133, and the sub-valve plate 210 is placed on the lower valve seat 125;

2. referring to fig. 2, when the pump is started, the water supply at the inlet end 111 of the main channel 110 is present, the medium pressure in the inlet end 111 pushes the main valve plate 130 to move gradually from the fully closed position of fig. 2 to the fully open position, and part of the medium in the second communicating pipe 340 enters the lower chamber 312;

3. referring to fig. 3, at this time, the main valve plate 130 has moved from the fully closed position to the half open position, and then drives the control rod 200 to gradually move upward, some medium enters the lower chamber 312 through the second communication pipe 340, and the medium in the upper chamber 311 is partially discharged into the outlet end 112 of the main passage 110 through the first communication pipe 330 due to the low pressure, so that the lifting structure 320 also gradually moves upward; the first communicating pipe 330 is provided with a valve for controlling the liquid outlet flow, so that the speed of discharging the medium in the upper chamber 311 is reliably controlled, and the main valve plate 130 is slowly opened; the starting time is adjustable, the motor overload in the starting process can be avoided, and the stable starting of the pump set is realized. In addition, the liquid inlet cavity 121, the volume cavity 123 and the liquid outlet cavity 122 are communicated at this time, so that the outward release pressure relief can be synchronously opened, and the valve opening water hammer damage accident caused by sudden pressure rise of the outlet end 112 is avoided;

4. referring to FIG. 4, when the main valve plate 130 is in the fully open position, the unit flow rate flowing in the main passage 110 is maximized; at this time, the auxiliary valve plate 210 abuts against the upper valve seat 124, the lifting structure 320 is lifted to the highest position, the medium in the upper chamber 311 is almost completely emptied, and the medium in the lower chamber 312 reaches the capacity;

5. referring to fig. 5, when the pump is turned off, the flow at the inlet 111 of the main channel 110 suddenly drops to zero, and the main valve plate 130 loses the lifting force of the medium, so that the main valve plate is quickly closed under the action of the eccentric gravity, the backflow medium is completely cut off, and the reverse rotation of the water pump is avoided; at this time, since the outlet end 112 of the main channel 110 still has back pressure, the second connection pipe 340 will supply the medium into the upper chamber 311, push the lifting structure 320 to descend, and drive the control rod 200 to descend; meanwhile, the auxiliary valve plate 210 also rapidly falls under the thrust of self weight and backwater, so that the auxiliary valve plate 210 is separated from the upper valve seat 124 and is communicated with the liquid inlet cavity 121, the volume cavity 123 and the liquid outlet cavity 122, so that a pressure medium flowing back in the outlet end 112 of the main channel 110 can be rapidly discharged from a liquid outlet of the liquid outlet cavity 122, abnormal pressure rise of the outlet end 112 of the main channel 110 is avoided, namely, a pump stopping water hammer of the outlet end 112 of the main channel 110 is reduced, and the safety of a pipe network system is protected;

6. referring to fig. 6, the lever 200 is not yet fully lowered to the lowest position, but the buffer step 220 of the lever 200 is partially inserted into the central passage, and thus the buffer chamber 141 is formed. It is conceivable that the medium in the lower chamber 312 is mainly discharged through the quick-closing pipe 342 before the buffering step 220 enters the central passage, so that the descending speed of the control rod 200 is fast, and as can be seen from the above, the buffering chamber 141 cannot be quickly decompressed through the buffering pipe 341, so that the descending speed of the control rod 200 is remarkably slowed down after the buffering step 220 partially enters the central passage, thereby satisfying the requirement of adjustable system water hammer reduction time, and the final closing time of the control rod 200 can be controlled by the opening degree of the buffering pipe 341.

7. After the control rod 200 is completely lowered to the bottom thereof against the projection 133, the pipe according to the embodiment of the present invention is restored to the state of fig. 1 from the self-powered pump control valve.

According to the pipeline self-operated pump control valve provided by the embodiment of the invention, the main channel 110 of the main valve body 101 is communicated with the pressure relief channel 120 of the pressure relief valve body 102 by arranging the main valve body 101 and the pressure relief valve body 102, and the pressure relief channel 120 can automatically release pressure outwards in the pump starting stage and the pump stopping stage, so that water hammer generated in the pump starting stage and the pump stopping stage is reduced, and the risk of reversing the water pump in the pump stopping stage is avoided; the pressure relief channel 120 has few structural parts, the internal structure of the valve body 100 is simple, the service life can be effectively prolonged, and the production cost is reduced; the control assembly 300 is located outside the valve body 100 to facilitate on-line maintenance.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. A self-powered pump-controlled valve for a pipeline, comprising:

the valve body (100) is provided with a main channel (110) for liquid to flow through and a pressure relief channel (120) communicated with the main channel (110), and a main valve plate (130) for controlling the on-off of the main channel (110) is installed in the main channel (110);

a control rod (200) passing through the pressure relief channel (120) and entering the main channel (110) from the bottom end; the top of the control rod (200) is connected with a control assembly (300) for driving the control rod to lift, and the middle part of the control rod is provided with an auxiliary valve plate (210);

wherein the main valve plate (130) has a fully closed position and a fully open position, and the main valve plate (130) can drive the control rod (200) to ascend when moving from the fully closed position to the fully open position; when the main valve plate (130) is located at the full-open position or the full-closed position, the auxiliary valve plate (210) can cut off the communication between the main channel (110) and the pressure relief channel (120).

2. The self-powered pump-controlled valve for pipes of claim 1, wherein the pressure relief channel (120) comprises:

the liquid inlet cavity (121) is provided with a liquid inlet communicated with the main channel (110);

a liquid outlet cavity (122) provided with a liquid outlet;

the volume cavity (123) is arranged between the liquid inlet cavity (121) and the liquid outlet cavity (122) to communicate the liquid inlet cavity (121) with the liquid outlet cavity (122), and the auxiliary valve plate (210) is movably arranged in the volume cavity (123).

3. The self-powered pump-controlled valve for pipeline as claimed in claim 2, wherein: a lower valve seat (125) is arranged at the joint of the volume cavity (123) and the liquid inlet cavity (121), an upper valve seat (124) is arranged at the joint of the volume cavity (123) and the liquid outlet cavity (122), and when the main valve plate (130) is located at a full-closed position, the auxiliary valve plate (210) abuts against the lower valve seat (125) to cut off the communication between the volume cavity (123) and the liquid inlet cavity (121); when the main valve plate (130) is located at the full-open position, the auxiliary valve plate (210) is abutted against the upper valve seat (124) to cut off the communication between the volume cavity (123) and the liquid outlet cavity (122).

4. The plumbing self-powered pump control valve of claim 2, wherein the control assembly (300) comprises:

a cavity container (310) with an inner cavity inside;

the lifting structure (320) is movably arranged in the inner cavity in a lifting way; the top end of the control rod (200) is connected with the lifting structure (320).

5. The self-powered pump-controlled valve for pipeline as claimed in claim 4, wherein: the lifting structure (320) divides the inner cavity into an upper cavity (311) and a lower cavity (312), the main channel (110) is provided with an inlet end (111) and an outlet end (112), the lower cavity (312) is communicated with the inlet end (111) of the main channel (110), and the upper cavity (311) is communicated with the outlet end (112) of the main channel (110).

6. The self-powered pump-controlled valve for pipeline of claim 5, characterized in that: the main valve plate (130) is provided with a water facing surface (131) and a water backing surface (132), the water facing surface (131) faces the inlet end (111), the water backing surface (132) is provided with a convex block (133) protruding out of the surface of the water backing surface, and when the main valve plate (130) is located at a fully closed position, the bottom of the control rod (200) is abutted to the convex block (133).

7. The self-powered pump-controlled valve for pipeline as claimed in claim 5, wherein: the top of the valve body (100) is provided with a stop ring (140) which extends upwards into the lower chamber (312), and a central channel which is communicated with the lower chamber (312) and the liquid outlet cavity (122) is arranged at the central position of the stop ring (140).

8. The self-powered pump-controlled valve for pipeline as claimed in claim 7, wherein: the bottom of the central channel is provided with an annular plate (150) extending towards the center, and the control rod (200) penetrates through the central channel and is connected with the annular plate (150) in a sealing mode.

9. The self-powered pump-controlled valve for pipeline according to claim 8, characterized in that: the top of the control rod (200) is provided with a buffer shaft step (220) which protrudes radially, and the buffer shaft step (220) can be embedded into the central channel and is in sealing connection with the inner side wall of the central channel so as to form a buffer cavity (141) between the bottom of the buffer shaft step (220) and the top of the annular plate (150); the buffer chamber (141) communicates with the inlet end (111) of the main passage (110) for slowing down the descending speed of the control lever (200).

10. The self-powered pump-controlled valve for pipelines according to claim 1, characterized in that: the main valve plate (130) is in an inclined state when in a fully closed position.

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