Pressure stabilizing device for switching oil pump of feed pump turbine

Abstract

The pressure stabilizing device comprises a detecting and filtering mechanism, the detecting and filtering mechanism comprises a main pipe, the top of the main pipe communicates with a first pressure sensor, the right side of the main pipe communicates with a fixing pipe, and the right side of the fixing pipe is provided with a connecting pipe; and the right side of the connecting pipe communicates with a shell, and a filter plate is inserted into the top of the shell. According to the pressure stabilizing device for switching the oil pump of the water feeding pump turbine, the detection filtering mechanism is arranged, the pressure value is set through the PLC, in the working process, impurities in speed regulation oil are filtered out through the corresponding filter plates, and the pressure stabilizing device can be switched off when the filter plates are blocked or the oil pump of the water feeding pump turbine in the working state breaks down. The first pressure sensor can detect that the pressure value is lower than a set value, at the moment, the PLC can control the water feeding pump turbine oil pump in the working state to stop working, meanwhile, the water feeding pump turbine oil pump in the standby state can be started to work, and the oil pumps are automatically switched to work.

Description

Technical Field

[0001] The invention relates to the technical field of oil pump pressure stabilization, and in particular to a pressure stabilization device for switching an oil pump of a feedwater pump turbine. Background Art

[0002] The feed pump turbine oil pump is an important equipment used to provide lubricating oil and regulating oil to various components of the feed pump turbine. The function of the lubricating oil is to form an oil film between the shaft neck and the bearing of the feed pump turbine to reduce friction and wear, while taking away the heat generated by friction, cooling and lubricating the rotating parts of the feed pump turbine to ensure that the feed pump turbine can operate safely, stably and efficiently. The regulating oil is used to control the speed control system and protection system of the feed pump turbine to ensure that the feed pump turbine can operate according to the predetermined operating conditions and perform protective actions in time when abnormal conditions occur. Common feed pump turbine oil pumps include AC oil pumps and DC oil pumps.

[0003] According to the patent document: CN220378461U, a pressure stabilizing device for a steam turbine oil pump is disclosed, including: a lubricating oil main pipe, wherein the two ends of the lubricating oil main pipe are respectively provided with an oil inlet and an oil outlet; a check valve, wherein the check valve is provided on the lubricating oil main pipe to prevent the backflow of lubricating oil; a plurality of accumulators, wherein the accumulators are used to store lubricating oil, and the plurality of accumulators are arranged horizontally; a tee pipe; a pipeline assembly, wherein the pipeline assembly is used to connect the lubricating oil main pipe with the accumulator; wherein the accumulator is used to transport the lubricating oil to the lubricating oil main pipe through the pipeline assembly and the tee pipe when the pressure of the lubricating oil main pipe is too low. Through the accumulator and the pipeline assembly, the problem of providing lubricating oil to the lubricating oil main pipe through the accumulator when the pressure of the lubricating oil main pipe is too low is solved, and the pressure of the lubricating oil main pipe is stabilized until the oil pump switching is completed.

[0004] At present, traditional pressure stabilizing devices are all equipped with an accumulator directly on the oil circuit. When the feedwater pump turbine is operating normally, the speed regulating oil pressure fluctuates within a certain range. At this time, the accumulator bladder will also shrink with the fluctuation of oil pressure. The long-term repeated contraction of the bladder reduces its service life, causing the accumulator bladder to rupture during the normal operation of the unit, and the speed regulating oil leaks from the accumulator bladder inflation port. At this time, if the operating personnel do not manually close the accumulator oil inlet valve in time, the protection action will cause the feedwater pump turbine to stop operating. In addition, the current feedwater pump turbine speed regulating oil system uses a filter that needs to be replaced. During the filter replacement process, it is necessary to manually switch to the spare filter before replacement. During the filter replacement process, if the switch valve seal fails, it is easy to cause the speed regulating oil to leak, threatening the safe operation of the unit. Summary of the invention

[0005] The purpose of the present invention is to provide a voltage stabilizing device for switching the oil pump of a feedwater pump turbine, so as to solve the problem that the accumulator bladder of the current traditional voltage stabilizing device mentioned in the above background technology is in a state of repeated contraction for a long time, which reduces the service life and causes the accumulator bladder to rupture during normal operation of the unit, and the speed regulating oil leaks from the accumulator bladder inflation port. At this time, if the operating personnel do not manually close the accumulator oil inlet valve in time, the protection action will cause the feedwater pump turbine to stop running. In addition, during the process of replacing the filter, it is necessary to manually switch to the spare filter before replacement. During the process of replacing the filter, if the switch valve seal fails, it is easy to cause the speed regulating oil to leak, threatening the safe operation of the unit.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure stabilizing device for switching a feed pump turbine oil pump, comprising a detection and filtering mechanism, the detection and filtering mechanism comprising a main pipe, the top of the main pipe is connected to a first pressure sensor, the right side of the main pipe is connected to a fixed pipe, the right side of the fixed pipe is provided with a connecting pipe, the right side of the connecting pipe is connected to a shell, a filter plate is plugged into the top of the shell, one side of the shell is fixedly connected to an electric telescopic rod, the bottom of the electric telescopic rod is fixedly connected to a rectangular plate, one side of the rectangular plate is fixedly connected to a vertical plate, one side of the vertical plate is fixedly connected to a brush rod, the bottom of the main pipe is provided with a hollow tube, one side of the hollow tube is connected to a second pressure sensor.

[0007] Preferably, a pressure stabilizing mechanism is provided on one side of the shell, and the pressure stabilizing mechanism includes a hollow block, the left side of the hollow block is connected to a fixed pipe, the right side of the inner cavity of the hollow block is in contact with a sealing disk, the left side of the sealing disk is fixedly connected to a spring, the left side of the spring is fixedly connected to the hollow block, the bottom of the main pipe is connected to a solenoid valve, the bottom of the solenoid valve is connected to the hollow pipe, one side of the hollow pipe is connected to an accumulator, and the right side of the hollow block is connected to a connecting pipe.

[0008] Preferably, the right side of the shell is connected with a material guide pipe, and the inner cavities of the filter plate and the fixing seat are both provided with insertion holes.

[0009] Preferably, a rectangular groove is formed on the top and the bottom of the shell, and a sealing ring is fixedly connected to the inner cavity of the rectangular groove.

[0010] Preferably, a fixing seat is fixedly connected to the left side of the top of the shell, an iron pin is provided on the right side of the filter plate, the left side of the iron pin passes through the filter plate and the fixing seat in sequence and extends to the left side of the fixing seat, the left side of the iron pin contacts a magnetic block, one side of the magnetic block is fixedly connected to a fixing frame, and one side of the fixing frame is fixedly connected to the shell.

[0011] Preferably, a fixing plate is fixedly connected to the right side of the top of the shell, a PLC controller is fixedly connected to the front side of the top of the fixing plate, and a buzzer is fixedly connected to the rear side of the top of the fixing plate.

[0012] Preferably, the inner cavity of the sealing disk is slidably connected to a sliding rod, and both sides of the sliding rod are fixedly connected to the hollow block.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a filtering mechanism that can be cleaned online and setting the pressure value through the PLC controller, during the working process, impurities in the oil are filtered out through the corresponding filter plate to prevent impurities from entering the inner cavity of the main pipe, and at the same time, the corresponding electric telescopic rod is started, the electric telescopic rod drives the rectangular plate to move, the rectangular plate drives the vertical plate to move, and the vertical plate drives the brush rod to move, brushing the filter plate, so that the filter plate is not easily blocked. When the filter plate is blocked or the working feedwater pump turbine oil pump fails, the first pressure sensor will detect that the pressure value is lower than the set value. At this time, the PLC controller will control the working feedwater pump turbine oil pump to stop working, and at the same time, it will start the standby feedwater pump turbine oil pump to work, perform automatic switching, and control the buzzer to work to remind the staff.

[0014] 2. By setting up a pressure stabilizing mechanism, when the corresponding feed water pump turbine oil pump is not working, the spring will push the sealing disk to move, so that the right side of the sealing disk is in close contact with the hollow block to avoid the reflux of the speed regulating oil. When the first pressure sensor detects that the pressure value is unstable, the solenoid valve will be opened to allow the speed regulating oil stored in the accumulator to enter the inner cavity of the main pipe, thereby performing pressure stabilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the shell of the present invention.

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the hollow block of the present invention.

[0019] In the figure: 1. detection and filtering mechanism; 101. main pipe; 102. first pressure sensor; 103. fixed pipe; 104. connecting pipe; 105. shell; 106. filter plate; 107. fixed seat; 108. iron pin; 109. magnetic block; 110. fixed frame; 111. electric telescopic rod; 112. rectangular plate; 113. vertical plate; 114. brush rod; 115. hollow pipe; 116. second pressure sensor; 2. voltage stabilizing mechanism; 201. hollow block; 202. sealing disk; 203. spring; 204. sliding rod; 205. accumulator; 206. solenoid valve; 3. fixed plate; 4. PLC controller; 5. buzzer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 , Figure 2 , Figure 3 and Figure 4The present invention provides a technical solution: a pressure stabilizing device for switching a feedwater pump turbine oil pump, comprising a detection and filtering mechanism 1, the detection and filtering mechanism 1 comprising a main pipe 101, the top of the main pipe 101 is connected to a first pressure sensor 102, the right side of the main pipe 101 is connected to a fixed pipe 103, the right side of the fixed pipe 103 is provided with a connecting pipe 104, the right side of the connecting pipe 104 is connected to a shell 105, the top of the shell 105 is plugged with a filter plate 106, one side of the shell 105 is fixedly connected to an electric telescopic rod 111, the bottom of the electric telescopic rod 111 is fixedly connected to a rectangular plate 112, one side of the rectangular plate 112 is fixedly connected to a vertical plate 113, one side of the vertical plate 113 is fixedly connected to a brush rod 114, the bottom of the main pipe 101 is fixedly connected to a vertical plate 113, and one side of the vertical plate 113 is fixedly connected to a brush rod 114. A hollow tube 115 is provided at the bottom, and one side of the hollow tube 115 is connected to a second pressure sensor 116. By setting the detection and filtering mechanism 1 and setting the pressure value through the PLC controller 4, during the working process, the impurities in the speed regulating oil are filtered out through the corresponding filter plate 106 to prevent the impurities from entering the inner cavity of the main pipe 101, and at the same time, the corresponding electric telescopic rod 111 is started, the electric telescopic rod 111 drives the rectangular plate 112 to move, the rectangular plate 112 drives the vertical plate 113 to move, and the vertical plate 113 drives the brush rod 114 to move, brushing the filter plate 106, so that the filter plate 106 is not easily blocked. When the filter plate 106 is blocked or the feed water pump turbine oil pump in the working state fails, the first pressure sensor 102 will detect that the pressure value is lower than the set value At this time, the PLC controller 4 will control the feedwater pump turbine oil pump in the working state to stop working, and will start the feedwater pump turbine oil pump in the standby state to work, perform automatic machine change work, and will control the buzzer 5 to work to remind the staff; the right side of the shell 105 is connected with a material guide pipe, and the inner cavity of the filter plate 106 and the fixed seat 107 are provided with jacks. By setting the material guide pipe, it is convenient to connect with the feedwater pump turbine oil pump, so as to facilitate the material feeding work; the top and bottom of the shell 105 are provided with rectangular grooves, and the inner cavity of the rectangular groove is fixedly connected with a sealing ring. By setting the sealing ring, the sealing effect is good to prevent the speed regulating oil from escaping; the left side of the top of the shell 105 is fixedly connected with the fixed seat 107, and the right side of the filter plate 106 is provided with An iron pin 108, the left side of the iron pin 108 passes through the filter plate 106 and the fixing seat 107 in sequence and extends to the left side of the fixing seat 107, the left side of the iron pin 108 contacts a magnetic block 109, one side of the magnetic block 109 is fixedly connected to a fixing frame 110, one side of the fixing frame 110 is fixedly connected to the shell 105, by setting the fixing frame 110, the operation of the magnetic block 109 is stabilized, and the magnetic block 109 is limited; a fixing plate 3 is fixedly connected to the right side of the top of the shell 105, the front side of the top of the fixing plate 3 is fixedly connected to the PLC controller 4, and the rear side of the top of the fixing plate 3 is fixedly connected to the buzzer 5. By setting the buzzer 5, an alarm can be easily issued during the switching process, thereby facilitating reminders to the staff and facilitating the staff to check the reasons for the switching.

[0022] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A pressure stabilizing mechanism 2 is provided on one side of the shell 105. The pressure stabilizing mechanism 2 includes a hollow block 201. The left side of the hollow block 201 is connected to the fixed pipe 103. The right side of the inner cavity of the hollow block 201 contacts a sealing disk 202. The left side of the sealing disk 202 is fixedly connected to a spring 203. The left side of the spring 203 is fixedly connected to the hollow block 201. The bottom of the main pipe 101 is connected to a solenoid valve 206. The bottom of the solenoid valve 206 is connected to the hollow pipe 115. One side of the hollow pipe 115 is connected to an accumulator 205. The right side of the hollow block 201 is connected to the connecting pipe 104. By providing the pressure stabilizing mechanism 2, in the corresponding feedwater pump turbine When the oil pump is not working, the spring 203 will push the sealing disk 202 to move, so that the right side of the sealing disk 202 is in close contact with the hollow block 201 to avoid the backflow of the speed regulating oil, and when the first pressure sensor 102 detects that the pressure value is unstable, the solenoid valve 206 will be opened to allow the lubricating oil stored in the accumulator 205 to enter the inner cavity of the main pipe 101, thereby performing pressure stabilization; the inner cavity of the sealing disk 202 is slidably connected with a sliding rod 204, and both sides of the sliding rod 204 are fixedly connected to the hollow block 201. By setting the sliding rod 204, the operation of the sealing disk 202 is stabilized, and the sealing disk 202 is balanced and supported.

[0023] Working principle: by setting the detection and filtering mechanism 1, the pressure value is set by the PLC controller 4. During the working process, the impurities in the speed regulating oil are filtered out by the corresponding filter plate 106 to prevent the impurities from entering the inner cavity of the main pipe 101. At the same time, the corresponding electric telescopic rod 111 is started, and the electric telescopic rod 111 drives the rectangular plate 112 to move, the rectangular plate 112 drives the vertical plate 113 to move, and the vertical plate 113 drives the brush rod 114 to move, brushing the filter plate 106, so that the filter plate 106 is not easily blocked. In the case that the filter plate 106 is blocked or the feedwater pump turbine oil pump in the working state fails, the first pressure sensor 102 will detect that the pressure value is lower than the set value. At this time, the PLC controller 4 will control the feedwater pump turbine oil pump in the working state to stop working, and at the same time will start the feedwater pump turbine oil pump in the standby state to work, perform automatic machine change work, and control the buzzer 5 to work to remind the staff; By setting up the pressure stabilizing mechanism 2, when the corresponding feed water pump turbine oil pump is not working, the spring 203 will push the sealing disk 202 to move, so that the right side of the sealing disk 202 is in close contact with the hollow block 201, so as to avoid the reflux of the speed regulating oil, and when the first pressure sensor 102 detects that the pressure value is unstable, the solenoid valve 206 will be opened to allow the speed regulating oil stored in the accumulator 205 to enter the inner cavity of the main pipe 101, thereby performing pressure stabilization.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage stabilizing device for switching a feedwater pump turbine oil pump, comprising a detection and filtering mechanism (1), characterized in that: The detection and filtering mechanism (1) comprises a main pipe (101), the top of the main pipe (101) is connected to a first pressure sensor (102), the right side of the main pipe (101) is connected to a fixed pipe (103), the right side of the fixed pipe (103) is provided with a connecting pipe (104), the right side of the connecting pipe (104) is connected to a shell (105), the top of the shell (105) is plugged with a filter plate (106), one side of the shell (105) is fixedly connected to an electric telescopic rod (111), the bottom of the electric telescopic rod (111) is fixedly connected to a rectangular plate (112), one side of the rectangular plate (112) is fixedly connected to a vertical plate (113), one side of the vertical plate (113) is fixedly connected to a brush rod (114), the bottom of the main pipe (101) is provided with a hollow pipe (115), one side of the hollow pipe (115) is connected to a second pressure sensor (116).

2. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 1, characterized in that: A pressure stabilizing mechanism (2) is provided on one side of the housing (105), the pressure stabilizing mechanism (2) comprising a hollow block (201), the left side of the hollow block (201) being in communication with a fixed pipe (103), the right side of the inner cavity of the hollow block (201) being in contact with a sealing disk (202), the left side of the sealing disk (202) being fixedly connected with a spring (203), the left side of the spring (203) being fixedly connected with the hollow block (201), the bottom of the main pipe (101) being in communication with a solenoid valve (206), the bottom of the solenoid valve (206) being in communication with the hollow pipe (115), one side of the hollow pipe (115) being in communication with an accumulator (205), and the right side of the hollow block (201) being in communication with a connecting pipe (104).

3. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 1, characterized in that: The right side of the housing (105) is connected to a material guide pipe, and the inner cavities of the filter plate (106) and the fixing seat (107) are both provided with insertion holes.

4. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 1, characterized in that: The top and bottom of the housing (105) are both provided with rectangular grooves, and the inner cavity of the rectangular groove is fixedly connected to a sealing ring.

5. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 1, characterized in that: A fixing seat (107) is fixedly connected to the left side of the top of the shell (105); an iron pin (108) is provided on the right side of the filter plate (106); the left side of the iron pin (108) passes through the filter plate (106) and the fixing seat (107) in sequence and extends to the left side of the fixing seat (107); the left side of the iron pin (108) contacts a magnetic block (109); one side of the magnetic block (109) is fixedly connected to a fixing frame (110); one side of the fixing frame (110) is fixedly connected to the shell (105).

6. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 1, characterized in that: A fixing plate (3) is fixedly connected to the right side of the top of the housing (105), a PLC controller (4) is fixedly connected to the front side of the top of the fixing plate (3), and a buzzer (5) is fixedly connected to the rear side of the top of the fixing plate (3).

7. A voltage stabilizing device for switching a feedwater pump turbine oil pump according to claim 2, characterized in that: The inner cavity of the sealing disk (202) is slidably connected to a sliding rod (204), and both sides of the sliding rod (204) are fixedly connected to the hollow block (201).

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