CN218235432U - Protection subassembly, feed pump recirculation system and water supply unit of governing valve - Google Patents

Abstract

The utility model relates to a protection subassembly, feed pump recirculation system and water supply installation of governing valve, the protection subassembly of governing valve for connect between feed pump and governing valve, the protection subassembly includes isolation valve, actuating mechanism and control mechanism, control mechanism is configured to: and when the regulating valve is opened, controlling the actuating mechanism to open the isolation valve, and when the regulating valve is closed, controlling the actuating mechanism to close the isolation valve. Because the regulating valve is arranged between the water feeding pump and the water tank, a huge pressure difference is formed between the regulating valve and the water tank, and the huge pressure difference is directly borne by the regulating valve to have the risk of damage; when the flow of the water supply pump is insufficient, the regulating valve is opened, the isolating valve is opened along with linkage, and the normal work of the recirculation system is ensured.

Description

Protection subassembly, feed pump recirculation system and water supply unit of governing valve

Technical Field

The disclosure relates to the field of water supply pumps, in particular to a protection assembly of an adjusting valve, a water supply pump recirculation system and a water supply device.

Background

When a boiler of a thermal power plant generates electricity, water supply of water pump equipment is needed to form water circulation, however, when the flow of the water pump is smaller than a preset value in the initial starting stage or in the running process, the flow of water flowing through a pump body is too small, so that heat generated in the running process of the water pump is not taken away, the water supply can be vaporized, cavitation is formed, and even water pump vibration and water cut-off accidents are caused.

In view of the above problems, in the related art, a recirculation system (minimum flow protection) is generally provided to protect a boiler feed pump device, for example, chinese patent application No. 202121427371.X, which provides a service frequency electric feed pump mechanical seal life-prolonging structure, in which a pneumatic regulating valve is connected in parallel to an electric feed pump booster pump to protect the feed pump, and only a manual valve in front of the valve is provided between the regulating valve and the feed pump to close the regulating valve for isolation when the regulating valve needs to be maintained.

However, the regulating valve of the recirculation system of the feed pump is one of the worst regulating valves in the operation condition of the thermal power plant, and because the regulating valve is positioned between the outlet of the feed pump and the deaerating water tank (or the condenser), the huge pressure difference between the outlet of the feed pump and the deaerating water tank (or the condenser) is borne by the valve, the valve core assembly is easy to erode due to strong scouring, the internal leakage of the valve is caused, the energy consumption of the feed pump is increased, and the fault risk of equipment is increased.

SUMMERY OF THE UTILITY MODEL

The present disclosure is directed to a protection assembly of a control valve, a feed pump recirculation system and a water supply device, which at least partially solve the problems of the related art.

In order to achieve the above object, the present disclosure provides a protection assembly of a regulator valve for connection between a feed pump and the regulator valve, the protection assembly comprising: the isolating valve is arranged between the feed pump and the regulating valve in a water way communication manner; the control mechanism is electrically connected with the regulating valve to acquire the on-off state of the regulating valve; and an actuator electrically connected to the control mechanism, the actuator configured to: opening the isolation valve when the regulator valve is open, and closing the isolation valve when the regulator valve is closed.

Optionally, the actuator comprises: a cylinder body; a piston head received in the cylinder; and one end of the piston rod is connected with the piston head, and the other end of the piston rod extends out of the cylinder body, wherein the isolation valve comprises a door body connected with the piston rod, the execution mechanism is used for externally connecting a power source, the power source is used for driving the piston head to reciprocate in the cylinder body, so that the piston rod follows the piston head to reciprocate and drives the door body to move, and the isolation valve is opened or closed.

Optionally, the power source is an air source.

Optionally, the piston head divides the cylinder into a first chamber and a second chamber, the air source is communicated with the first chamber through a first pipeline and communicated with the second chamber through a second pipeline, wherein a first valve electrically connected with the control mechanism is arranged on the first pipeline, and a second valve electrically connected with the control mechanism is arranged on the second pipeline.

Optionally, the first pipeline is provided with a first exhaust valve electrically connected with the control mechanism, and the second pipeline is provided with a second exhaust valve electrically connected with the control mechanism.

Optionally, the protection component further comprises a gas storage tank for storing compressed gas, the gas storage tank is communicated with the first cavity through a third pipeline and communicated with the second cavity through a fourth pipeline, a third valve electrically connected with the control mechanism is arranged on the third pipeline, and a fourth valve electrically connected with the control mechanism is arranged on the fourth pipeline.

Optionally, the third pipeline is provided with a third exhaust valve electrically connected with the control mechanism, and the fourth pipeline is provided with a fourth exhaust valve electrically connected with the control mechanism.

Optionally, the control mechanism is electrically connected to the air pressure detection device, and is configured to control two of the third valve, the fourth valve, the third exhaust valve, and the fourth exhaust valve to cooperate to open or close the isolation valve when the pressure of the air source is smaller than a preset threshold value.

According to a second aspect of the present disclosure, there is provided a feed pump recirculation system for connection between a feed pump and a water tank, the recirculation system comprising a regulating valve and the above-mentioned protection assembly, the protection assembly being disposed between the feed pump and the regulating valve.

According to a third aspect of the present disclosure, there is provided a water supply apparatus comprising a water tank, a feed water pump, and the feed water pump recirculation system described above.

Through using above-mentioned technical scheme, because the governing valve setting is formed with huge pressure differential between water feeding pump and water tank, among the correlation technique, water feeding pump normal during operation, the governing valve is closed, the isolating valve is opened, and this huge pressure differential directly acts on the governing valve for the case subassembly of governing valve easily erodees because of strong the washing away, causes the valve internal leakage, increases water feeding pump energy consumption and increase equipment trouble risk. When the regulating valve is closed, the control mechanism controls the actuating mechanism to close the isolating valve positioned between the regulating valve and the water feeding pump in a linkage manner, so that the isolating valve can bear the pressure difference for the regulating valve, and the regulating valve is prevented from being damaged due to overlarge pressure; when the flow of the water supply pump is insufficient, the regulating valve is opened, the control mechanism controls the actuating mechanism to open the isolating valve in a linkage mode, so that liquid can sequentially flow through the water supply pump, the isolating valve and the regulating valve and return to the water tank, and the heat of the water supply pump is taken away to protect the water supply pump.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is a schematic illustration of a protection assembly of a regulator valve according to an exemplary illustration of the present disclosure;

FIG. 2 is a schematic view of an exemplary actuator according to the present disclosure.

Description of the reference numerals

10-a feed pump; 20-adjusting the valve; 30-an isolation valve; 31-a door body; 40-an actuator; 41-cylinder body; 411-a first chamber; 412-a second chamber; 42-a piston head; 43-a piston rod; 50-a control mechanism; 60-a power source; 61-a gas source; 71-a first conduit; 72-a second conduit; 73-a third line; 74-a fourth conduit; 81-a first valve; 82-a second valve; 83-a third valve; 84-a fourth valve; 91-a first exhaust valve; 92-a second exhaust valve; 93-a third exhaust valve; 94-fourth exhaust valve; 100-a gas storage tank; 110-water tank.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of the directional terms "inside and outside" should be understood based on the application environment of the relevant component, which may be defined based on the actual use direction of the relevant component, or may be based on the self-profile of the component. For example: reciprocating the piston head "within" the cylinder means that the piston head is received in the cylinder and reciprocates axially of the cylinder.

In addition, in the present disclosure, the terms "first", "second", and the like are used to distinguish one element from another, without order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

Referring to fig. 1, the present disclosure provides a protection assembly of a regulator valve for connecting between a feedwater pump 10 and a regulator valve 20, the protection assembly may include an isolation valve 30 disposed in water communication between the feedwater pump 10 and the regulator valve 20, a control mechanism 50 electrically connected to the regulator valve 20 to obtain an on-off state of the regulator valve 20, and an actuator 40 electrically connected to the control mechanism 50, wherein the actuator 40 is configured to: the isolation valve 30 is opened when the regulator valve 20 is open, and the isolation valve 30 is closed when the regulator valve 20 is closed. The present disclosure does not limit the kind of the isolation valve 30, for example, in the embodiment of the present disclosure, the isolation valve 30 may be a gate valve. Furthermore, in other embodiments, the isolation valve 30 may also be a shut-off valve.

Here, it should be explained that the function of the feed water pump 10 is to supply the liquid pump in the water tank 110 to other relevant locations requiring water or water power, such as a boiler, which is described below as an example for convenience of description, but is not limited to the boiler. A minimum flow protection branch (recirculation system to be described later) is formed at a position between the feed pump 10 and the boiler, that is, a supply line between the feed pump 10 and the boiler is connected to another line leading to the water tank, and a regulating valve 20 is provided in the line for opening when the flow rate through the feed pump 10 is insufficient (at this time, the line leading to the boiler is closed) to return the water flow to the water tank 110 through the regulating valve 20, thereby taking away the heat of the feed pump 10 by the flowing water and preventing the feed pump 10 from being damaged by overheating.

In the embodiment of the present disclosure, the control mechanism 50 may be a control circuit board, which is inputted with the above control logic, and electrically connects the regulating valve 20 and the actuator 40, and after receiving the on-off state of the regulating valve 20, the control circuit board sends an electrical signal to control the actuator 40 to perform a corresponding action. The present disclosure is not limited to the internal program and the specific manner of implementing the logic of the control mechanism 50, nor is the improvement point the internal program and the implementation logic of the control mechanism 50. The improvement of the disclosed embodiment over the related art is the integral structure obtained by electrically connecting the control mechanism 50 with the actuator 40 and the regulating valve 20, so as to obtain the above-mentioned technical effect of "the on-off state of the isolating valve 30 changes (i.e. is linked) with the on-off state of the regulating valve 20".

Because the regulating valve 20 is arranged between the water feeding pump 10 and the water tank 110, and a huge pressure difference is formed between the water feeding pump 10 and the water tank 110, in the related art, when the water feeding pump 10 normally works, the regulating valve 20 is closed, the isolating valve 30 is opened, and the huge pressure difference directly acts on the regulating valve 20, so that a valve core assembly of the regulating valve 20 is easy to erode due to strong scouring, the valve inner leakage is caused, the energy consumption of the water feeding pump 10 is increased, and the equipment failure risk is increased. By using the above technical solution, when the regulating valve 20 is closed, the control mechanism 50 controls the actuator 40 to close the isolation valve 30 located between the regulating valve 20 and the feed water pump 10 in a linkage manner, so that the isolation valve 30 can bear the pressure difference for the regulating valve 20, and the regulating valve 20 is prevented from being damaged due to excessive pressure; when the flow of the water supply pump 10 is insufficient, the regulating valve 20 is opened, and the control mechanism 50 controls the actuating mechanism 40 to open the isolation valve 30 in a linkage manner, so that the liquid can sequentially flow through the water supply pump 10, the isolation valve 30, the regulating valve 20 and return to the water tank 110, and the heat of the water supply pump 10 is taken away to protect the water supply pump.

Referring to fig. 2, in an embodiment of the present disclosure, the actuator 40 may include: a cylinder 41; a piston head 42 accommodated in the cylinder body 41; and a piston rod 43, one end of which is connected with the piston head 42, and the other end of which extends out of the cylinder 41, wherein the isolation valve 30 can comprise a door body 31 connected with the piston rod 43, and the door body 31 is used for realizing the opening and closing of the isolation valve 30, so that fluid can pass through or be cut off. The actuator 40 is externally connected with a power source 60, and the power source 60 is used for driving the piston head 42 to reciprocate in the cylinder body 41, so that the piston rod 43 follows the piston head 42 to reciprocate and drives the door body 31 to move, and the isolation valve 30 is opened or closed.

The structure of the actuator 40 is not limited in the present disclosure, according to some other embodiments, the actuator 40 may also be a screw mechanism, which includes a motor, a screw connected to an output shaft of the motor, and a nut in threaded fit with the screw, the nut is fixed on the door 31, and when in use, the motor drives the screw to rotate, so that the nut drives the door 31 to move, so as to close or open the isolation valve 30. Still alternatively, in some other embodiments, the actuating mechanism 40 may also be a slider-crank mechanism, and the slider drives the door 31 to reciprocate so as to open or close the isolation valve 30.

In order to ensure the speed of the actuator 40 opening or closing the isolation valve 30, referring to fig. 2, in some embodiments, the power source 60 may be an air source 61, in this case, the isolation valve 30 may meet the requirement of quick opening in an emergency, and the time from when the control mechanism 50 issues an opening command to when the door 31 of the isolation valve 30 reaches 90% opening degree is less than 8 seconds. In addition, in other embodiments, the power source 60 may be a water source, but when the power source 60 is the air source 61, the structure of the actuator 40 is relatively simple, and the complexity of the structure can be avoided.

Referring to fig. 2, in the embodiment of the present disclosure, the piston head 42 may divide the cylinder 41 into a first chamber 411 and a second chamber 412, and the air source 61 may communicate with the first chamber 411 through the first pipeline 71 and communicate with the second chamber 412 through the second pipeline 72, wherein the first pipeline 71 is provided with the first valve 81 electrically connected to the control mechanism 50, and the second pipeline 72 is provided with the second valve 82 electrically connected to the control mechanism 50. In use, the air source 61 is inflated towards the first chamber 411 or the second chamber 412 of the cylinder 41 and pushes the piston head 42 to move by controlling the opening and closing of the first valve 81 and the second valve 82. Specifically, referring to FIG. 2, when it is desired to move the piston head 42 downward, for example, the first valve 81 is opened and the second valve 82 is closed, the gas source 61 discharges gas into the first chamber 411 through the first conduit 71 and pushes the piston head 42 downward and compresses the gas in the second chamber 412.

Further, in order to exhaust the gas inside the compressed one of the first and second chambers 411 and 412, so that the piston head 42 has a larger movement stroke and a smaller movement resistance, referring to fig. 2, in an embodiment of the present disclosure, the first line 71 may be provided with a first exhaust valve 91 electrically connected to the control mechanism 50, and the second line 72 may be provided with a second exhaust valve 92 electrically connected to the control mechanism 50. Wherein the first and second exhaust valves 91 and 92 are disposed at positions closer to the cylinder 41 on the corresponding lines so that the gas compressed in the cylinder 41 is exhausted from the corresponding exhaust valves. For example, in the embodiment described above, as the piston head 42 moves downward, the second chamber 412 is compressed, and the control mechanism 50 opens the second exhaust valve 92 to allow gas to escape. Also, the control mechanism 50 may cooperate to stop movement of the piston head 42 by controlling the exhaust valve and the valve when the piston head 42 is moved to a desired position.

In an embodiment of the present disclosure, the exhaust valve and the valve may be respectively disposed at different positions of the pipeline. In other embodiments, the valve and the exhaust valve may be formed on a three-way valve, wherein one outlet of the three-way valve extends out of the pipeline to serve as the exhaust valve, and the other two openings serve as valves, which is not limited by the disclosure.

In order to protect the regulating valve 20 and the feed water pump 10 when the air source 61 fails, the actuator 40 may still open or close the isolation valve 30, and referring to fig. 2, in the embodiment of the present disclosure, the protection assembly may further include an air tank 100 for storing compressed air, the air tank 100 may be communicated with the first chamber 411 through a third pipeline 73 and may be communicated with the second chamber 412 through a fourth pipeline 74, the third pipeline 73 is provided with a third valve 83 electrically connected with the control mechanism 50, and the fourth pipeline 74 may be provided with a fourth valve 84 electrically connected with the control mechanism 50.

Further, the third pipe 73 may be provided with a third exhaust valve 93 electrically connected with the control mechanism 50, and the fourth pipe 74 may be provided with a fourth exhaust valve 94 electrically connected with the control mechanism 50.

The above-mentioned gas storage tank 100 and the gas source 61 have the same function, and both have the function of charging the cylinder 41, and the gas storage tank 100 belongs to a standby gas source. The third and fourth pipes 73 and 74 serve to communicate the air tank 100 with the first and second chambers 411 and 412, respectively, in correspondence with the first and second pipes 71 and 72. The third valve 83, the fourth valve 84, the third exhaust valve 93 and the fourth exhaust valve 94 are in accordance with the first valve 81, the second valve 82, the first exhaust valve 91 and the second exhaust valve 92, and are connected to the control mechanism 50 and cooperate with the control mechanism 50 to realize the movement of the piston head 42, and the detailed process is referred to the working process of the air source 61.

The present disclosure does not limit the types of the first, second, third, and fourth valves 81, 82, 83, and 84, and may be, for example, a shut-off valve, a gate valve, or the like, as long as the shut-off valve can block and open the corresponding line.

In order to enable the air storage tank 100 to enter the working state in time when the air source 61 fails, in the embodiment of the present disclosure, the protection assembly may further include an air pressure detecting device for acquiring the pressure of the air source 61, and the control mechanism 50 is electrically connected to the air pressure detecting device for controlling two of the third valve 83, the fourth valve 84, the third exhaust valve 93, and the fourth exhaust valve 94 to cooperate to open or close the isolation valve 30 when the pressure of the air source 61 is smaller than a preset threshold.

The disclosure does not limit the specific value of the preset threshold, for example, in the embodiment of the disclosure, the preset threshold may be 0.4Mpa, and in some other embodiments, the preset threshold may be 0.8Mpa, 0.2Mpa, or the like.

In order to satisfy other functions of the isolation valve 30, for example, when the regulating valve 20 has a fault, the isolation valve 30 may be controlled to be closed individually, so that a worker may repair the regulating valve 20, in the embodiment of the present disclosure, the protection assembly may further include a main control board, and a user may release the linkage program of the control mechanism through the main control board and may individually control the opening and closing of the isolation valve 30 after the release.

According to a second aspect of the present disclosure, a feed pump recirculation system is provided for connecting between a feed pump 10 and a water tank 110, the recirculation system may include a regulating valve 20 and the above-mentioned protection assembly, the protection assembly is disposed between the feed pump 10 and the regulating valve 20, and the recirculation system has all the advantages of the above-mentioned protection assembly, and therefore, the description thereof is omitted.

According to a third aspect of the present disclosure, a water supply device is provided, which comprises a water tank 110, a feed water pump 10 and the above-mentioned feed water pump recirculation system, and since the water supply device has all the advantages of the above-mentioned recirculation system, it will not be described herein again.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A protection assembly for a regulator valve for connection between a feedwater pump and the regulator valve, said protection assembly comprising:

the isolating valve is arranged between the feed pump and the regulating valve in a water way communication manner;

the control mechanism is electrically connected with the regulating valve to acquire the on-off state of the regulating valve; and

an actuator electrically connected to the control mechanism, the actuator configured to:

opening the isolation valve when the regulator valve is open, an

Closing the isolation valve when the regulator valve is closed.

2. The protective assembly of claim 1, wherein the actuator comprises:

a cylinder body;

a piston head received in the cylinder; and

one end of the piston rod is connected with the piston head, the other end of the piston rod extends out of the cylinder body,

the isolation valve comprises a door body connected with the piston rod, the executing mechanism is externally connected with a power source, and the power source is used for driving the piston head to reciprocate in the cylinder body, so that the piston rod can reciprocate along with the piston head and drive the door body to move, and the isolation valve is opened or closed.

3. The protective assembly of claim 2, wherein the power source is a gas source.

4. The protective assembly of claim 3, wherein the piston head divides the cylinder into a first chamber and a second chamber, the gas source communicating with the first chamber via a first conduit and the second chamber via a second conduit, wherein the first conduit is provided with a first valve electrically connected to the control mechanism and the second conduit is provided with a second valve electrically connected to the control mechanism.

5. The protective assembly of claim 4, wherein the first conduit is provided with a first vent valve in electrical communication with the control mechanism and the second conduit is provided with a second vent valve in electrical communication with the control mechanism.

6. The protective assembly of claim 4, further comprising a gas reservoir for storing compressed gas, the gas reservoir communicating with the first chamber via a third line and the second chamber via a fourth line, the third line having a third valve electrically connected to the control mechanism, the fourth line having a fourth valve electrically connected to the control mechanism.

7. The protection assembly of claim 6, wherein said third conduit is provided with a third vent valve in electrical communication with said control mechanism, and said fourth conduit is provided with a fourth vent valve in electrical communication with said control mechanism.

8. The protective assembly according to claim 7, further comprising an air pressure detecting device for obtaining the pressure of the air source, wherein the control mechanism is electrically connected to the air pressure detecting device and is configured to control two of the third valve, the fourth valve, the third exhaust valve and the fourth exhaust valve to cooperate to open or close the isolation valve when the pressure of the air source is less than a preset threshold.

9. A feed pump recirculation system for connection between a feed pump and a water tank, characterized in that the recirculation system comprises a regulating valve and a protection assembly according to any of claims 1-8, the protection assembly being arranged between the feed pump and the regulating valve.

10. A water supply installation comprising a water tank, a feed pump and the feed pump recirculation system of claim 9.

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