Steam turbine feed pump LVDT device

Abstract

The utility model discloses a turbine feed pump LVDT device which comprises an LVDT device body arranged on one side of a feed pump and a fixing assembly arranged on an outer ring of a valve rod of the feed pump, the fixing assembly is used for being connected with the valve rod, the side edge of the fixing assembly is connected with a vertical plate, the vertical plate is connected with one end of a long plate, and the other end of the long plate is connected with an end plate. A second threaded hole is formed in the end plate, a connecting bolt is inserted into the second threaded hole, the connecting bolt is sleeved with a universal joint, and the lower end of the universal joint is connected with a feedback rod of the LVDT device; the vertical movement amplitude of the fixing assembly driven by the valve rod is transmitted to the connecting bolt inserted into the second threaded hole of the end plate through the vertical plate and the long plate, so that the connecting bolt moves up and down, the connecting bolt drives the feedback rod to move up and down, the LVDT device is used for measuring the vertical movement displacement of the feedback rod, and then position information of the valve rod is monitored. Operators are helped to know the state of the feed pump, and stable operation of the steam turbine is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the water pump monitoring technical field, concretely relates to a steam turbine water pump LVDT device. BACKGROUND

[0002] In the working process of steam turbine, the water pump is responsible for providing enough water to the boiler to ensure the generation of steam, and the valve rod of the water pump is one of the key components in the steam turbine water supply system, which mainly controls the flow and pressure of water into the steam turbine.

[0003] In the actual working process, if due to mechanical failure or foreign matter blockage, etc., the valve rod cannot be moved to the specified position, which will cause the working state of the steam turbine to deviate from the normal range, and further affect the safe and stable operation of the generator set, causing the power grid to be unstable. UTILITY MODEL CONTENT

[0004] To solve the problems encountered in the above background art, the present application provides a steam turbine water pump LVDT device, which can be used to monitor the position information of the valve rod, help the operator to understand the state of the water pump in time, and make necessary adjustments in time to ensure the stable operation of the steam turbine.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A steam turbine water pump LVDT device, comprising an LVDT device arranged on one side of the water pump and a fixed assembly arranged on the outer circle of the valve rod of the water pump, the fixed assembly is used to be connected with the valve rod, the side edge of the fixed assembly is connected with a vertical plate, the vertical plate is connected with one end of a long plate, the other end of the long plate is connected with an end plate, a second threaded hole is formed in the end plate, a connecting bolt is inserted into the second threaded hole, a universal joint is sleeved on the connecting bolt, and the lower end of the universal joint is connected with the feedback rod of the LVDT device.

[0007] In an embodiment of the present application, the fixed assembly comprises a first clamp block and a second clamp block, the side edge of the first clamp block is provided with a first threaded hole penetrating through, the side edges of the first clamp block and the second clamp block are respectively provided with arc-shaped clamping grooves, the side edge of the second clamp block is provided with a first through hole penetrating through, and the side edge of the vertical plate is provided with a second through hole penetrating through.

[0008] In an embodiment of the present application, the arc-shaped clamping groove surface of the first clamp block and the second clamp block is provided with a rubber anti-skid pad.

[0009] In one embodiment of the present application, two second threaded holes are arranged on the end plate, and a connecting bolt is respectively inserted into each of the two second threaded holes, and a universal joint is sleeved on each connecting bolt, and the lower end of the universal joint is connected with the feedback rod.

[0010] In one embodiment of the present application, the edges of the vertical plate, the long plate and the end plate are provided with round chamfers.

[0011] In one embodiment of the present application, the tail end of the fastening bolt is provided with a nut ring.

[0012] In one embodiment of the present application, the lower end surface of the long plate is connected with a baffle plate.

[0013] In summary, the technical scheme provided by the present application has the following beneficial technical effects: when the valve rod of the water pump is operated to move up and down, the fixed assembly of the outer ring of the valve rod is moved up and down, the up-and-down movement range of the fixed assembly is transmitted to the connecting bolt inserted into the second threaded hole of the end plate through the vertical plate and the long plate, the connecting bolt is moved up and down, the universal joint is sleeved on the connecting bolt, the lower end of the universal joint is connected with the feedback rod of the LVDT device, the connecting bolt drives the feedback rod to move up and down, the LVDT device is used to measure the displacement of the up-and-down movement of the feedback rod, thereby realizing the monitoring of the position information of the valve rod, helping the operator to understand the state of the water pump, and making necessary adjustment to the water pump according to the actual situation, so as to ensure the stable operation of the steam turbine. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0015] Figure 1 The stereoscopic structure schematic diagram of the LVDT device of the steam turbine water pump provided by one embodiment of the present application is shown in the figure.

[0016] Figure 2 The clamping block assembly structure schematic diagram of the LVDT device of the steam turbine water pump provided by one embodiment of the present application is shown in the figure.

[0017] Figure 3 The top view stereoscopic structure schematic diagram of the LVDT device of the steam turbine water pump provided by one embodiment of the present application is shown in the figure.

[0018] Figure 4 The plate round chamfer structure schematic diagram of the LVDT device of the steam turbine water pump provided by one embodiment of the present application is shown in the figure.

[0019] In the figure: water supply pump-100, valve rod-101;

[0020] LVDT device-1, feedback rod-11;

[0021] Fixed assembly-2, first clamp block-21, second clamp block-22, first through hole-221, first threaded hole-211, second clamp block-22;

[0022] Vertical plate-3, second through hole-31;

[0023] Long plate-4, baffle-41;

[0024] End plate-5, second threaded hole-51, connecting bolt-52, universal joint-53;

[0025] Arc-shaped clamping groove-6;

[0026] Fastening bolt-7, nut ring-71. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely below. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0028] It should be noted that in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0029] The terms "mounting", "connecting", "connecting" in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0030] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in the embodiments of the present application as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the embodied word "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0031] Noun interpretation, LVDT (Linear Variable Differential Transformer) is a kind of sensor for measuring displacement.

[0032] The embodiment provides a steam turbine feed pump LVDT device, refer to Figures 1-4 As shown in the figure, it comprises an LVDT device 1 arranged on one side of the feed pump 100 and a fixed assembly 2 arranged on the outer circle of the valve rod 101 of the feed pump 100, the fixed assembly 2 is used for being connected with the valve rod 101, the side edge of the fixed assembly 2 is connected with a vertical plate 3, the vertical plate 3 is connected with one end of a long plate 4, the other end of the long plate 4 is connected with an end plate 5, the end plate 5 is provided with a second threaded hole 51, a connecting bolt 52 is inserted into the second threaded hole 51, a universal joint 53 is sleeved on the connecting bolt 52, and the lower end of the universal joint 53 is connected with a feedback rod 11 of the LVDT device 1.

[0033] In the above embodiment, the LVDT device 1 is arranged at the side of the feed water pump 100, the fixed assembly 2 is connected with the outer ring of the valve rod 101 of the feed water pump 100, the side of the fixed assembly 2 is connected with the vertical plate 3, the vertical plate 3 is connected with one end of the long plate 4, the second threaded hole 51 is formed in the end plate 5, the connecting bolt 52 is inserted into the second threaded hole 51, the universal joint 53 is sleeved on the connecting bolt 52, and the lower end of the universal joint 53 is connected with the feedback rod 11 of the LVDT device 1. When the valve rod 101 of the water pump is operated to move up and down, the fixed assembly 2 of the outer ring of the valve rod 101 is driven to move up and down, the up-down movement range of the fixed assembly 2 is transmitted to the connecting bolt 52 inserted into the second threaded hole 51 of the end plate 5 through the vertical plate 3 and the long plate 4, the connecting bolt 52 is driven to move up and down, the universal joint 53 is sleeved on the connecting bolt 52, the lower end of the universal joint 53 is connected with the feedback rod 11 of the LVDT device 1, the connecting bolt 52 drives the feedback rod 11 to move up and down, the LVDT device 1 is used for measuring the displacement of the feedback rod 11 moving up and down, thereby realizing monitoring of the position information of the valve rod 101, helping the operator to understand the state of the feed water pump 100, and making necessary adjustment on the feed water pump 100 according to the actual situation, so as to ensure the stable operation of the steam turbine. In addition, the long plate 4 has a long plate body, and optionally, the length of the long plate 4 is greater than 2 times the length of the end plate 5. When the long plate 4 is subjected to the driving force of the fixed assembly 2 moving up and down, the plate body of the long plate 4 will be elastically vibrated, and the up-down movement range signal of the valve rod 101 is amplified. Further, the valve rod 101 of the water pump will be deflected to a certain extent in the horizontal direction under the impact of the water flow, so that the feedback rod 11 is subjected to a deflection stress, and the feedback rod 11 is prone to be broken due to the long-term deflection stress. The universal joint 53 is arranged at the connection position of the feedback rod 11 and the connecting bolt 52, the universal joint 53 can rotate in the horizontal plane, thereby offsetting the deflection stress of the feedback rod 11 caused by the deflection of the valve rod 101, and preventing the feedback rod 11 from being broken.

[0034] In one embodiment of the present application, referring to FIG. 1, Figure 1 , Figure 2 As shown in FIG. 1, the fixed assembly 2 comprises a first clamping block 21 and a second clamping block 22, the side of the first clamping block 21 is provided with a first threaded hole 211 penetrating through, and the side of the first clamping block 21 and the second clamping block 22 is respectively provided with an arc-shaped clamping groove 6, the side of the second clamping block 22 is provided with a first through hole 221 penetrating through, the side of the vertical plate 3 is provided with a second through hole 31 penetrating through, and the fastening bolt 7 is screwed into the first threaded hole 211 of the first clamping block 21 through the second through hole 31 and the first through hole 221.

[0035] In the above embodiment, the arc-shaped clamping grooves 6 of the first clamping block 21 and the second clamping block 22 are butted against the outer circumferential surface of the valve rod 101, the fastening bolt 7 is sequentially inserted through the second through hole 31 of the vertical plate 3 and the first through hole 221 of the second clamping block 22, and finally the fastening bolt 7 is screwed into the first threaded hole 211 of the first clamping block 21. During the process of screwing the fastening bolt 7 into the first threaded hole 211, the arc-shaped clamping grooves 6 of the first clamping block 21 and the second clamping block 22 tightly fix the outer circumferential surface of the valve rod 101, and the vertical plate 3 is fixedly connected with the side edge of the second clamping block 22 through the fastening bolt 7.

[0036] In one embodiment of the present application, the surface of the arc-shaped clamping groove 6 of the first clamping block 21 and the second clamping block 22 is provided with a rubber anti-skid pad.

[0037] In the above embodiment, the rubber anti-skid pad can increase the friction between the arc-shaped clamping groove 6 and the outer surface of the valve rod 101, prevent the first clamping block 21 and the second clamping block 22 from sliding down along the outer surface of the valve rod 101, cause the feedback rod 11 to be greatly pressed down, and further cause the displacement detection of the feedback rod 11 by the LVDT device 1 to be abnormal. On the other hand, the rubber anti-skid pad can reduce the hardness of the surface of the arc-shaped clamping groove 6 and prevent the surface of the valve rod 101 from being scratched.

[0038] In one embodiment of the present application, referring to Figure 1 As shown in the figure, the end plate 5 is provided with two second threaded holes 51, a connecting bolt 52 is inserted into each of the two second threaded holes 51, a universal joint 53 is sleeved on each connecting bolt 52, and the lower end of the universal joint 53 is connected with the feedback rod 11.

[0039] In the above embodiment, the two connecting bolts 52 are connected with the two feedback rods 11, the LVDT device 1 detects the displacement data of the two feedback rods 11, and the two sets of unique data are compared to improve the accuracy of the displacement data detection of the valve rod 101. For example, when one feedback rod 11 is bent and deformed, the displacement data generated thereby is different from the displacement data generated by the other feedback rod 11, thereby reminding the staff to maintain the LVDT device 1.

[0040] In one embodiment of the present application, referring to Figure 4 As shown in the figure, the edges of the vertical plate 3, the long plate 4 and the end plate 5 are provided with round chamfers.

[0041] In the above embodiment, the edges of the plate material, especially the metal plate material, are relatively sharp, and the staff may be injured when installing the feedback rod 11 and the connecting bolt 52. By providing the edges with round chamfers, the sharpness of the edges can be reduced to avoid injury to the staff during installation.

[0042] In one embodiment of the present application, referring to Figure 4As shown, the tail end of the fastening bolt 7 is provided with a nut ring 71.

[0043] In the above embodiment, the tail end of the fastening bolt 7 is sleeved with the nut ring 71, which is tightly attached to the side wall of the first clamping block 21, for plugging the first threaded hole 211 to prevent water vapor from entering the first threaded hole 211 to cause corrosion and fracture of the fastening bolt 7, and is beneficial to improve the stability of the fastening bolt 7 to the first clamping block 21 and the second clamping block 22.

[0044] In an embodiment of the present application, referring to Figure 1 As shown, the lower end surface of the long plate 4 is connected with a baffle plate 41.

[0045] In the above embodiment, the water pump 100 will cause vibration of the valve rod 101 during operation, and then cause vibration displacement of the universal joint 53, and then fall off from the insertion end of the connecting bolt 52, and the insertion end of the connecting bolt 52 is abutted with the baffle plate 41, which can prevent the universal joint 53 from falling off from the insertion end of the connecting bolt 52 due to vibration displacement.

[0046] In the actual use of the present application: the fixed assembly 2 is connected with the outer circle of the valve rod 101 of the water pump 100, the side edge of the fixed assembly 2 is connected with the vertical plate 3, the vertical plate 3 is connected with one end of the long plate 4, the second threaded hole 51 is formed in the end plate 5, and the connecting bolt 52 is inserted into the second threaded hole 51, the universal joint 53 is sleeved on the connecting bolt 52, and the lower end of the universal joint 53 is connected with the feedback rod 11 of the LVDT device 1. When the valve rod 101 of the water pump moves up and down, the fixed assembly 2 connected with the outer circle of the valve rod 101 moves up and down, and the up and down movement amplitude of the fixed assembly 2 is transmitted to the connecting bolt 52 inserted into the second threaded hole 51 of the end plate 5 through the vertical plate 3 and the long plate 4, so that the connecting bolt 52 moves up and down. The universal joint 53 is sleeved on the connecting bolt 52, and the lower end of the universal joint 53 is connected with the feedback rod 11 of the LVDT device 1. The connecting bolt 52 drives the feedback rod 11 to move up and down, and the LVDT device 1 is used for measuring the displacement of the feedback rod 11 moving up and down, thereby realizing monitoring the position information of the valve rod 101, helping the operator to understand the state of the water pump 100, and making necessary adjustment to the water pump 100 according to the actual situation, to ensure the stable operation of the steam turbine. Optionally, the LVDT device 1 can transmit the position information of the valve rod 101 to the control room through a signal transmission system, such as a voltage signal, to facilitate remote management and fault diagnosis by the operator. During regular maintenance and repair, the LVDT device 1 can provide detailed historical data of the movement of the valve rod 101, which is convenient for technicians to analyze the working condition of the valve rod 101 and timely find and solve problems.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A turbine feed pump LVDT arrangement, characterized by, The utility model provides a kind of fixed assembly (2) and LVDT device (1) for water supply pump (100), the fixed assembly (2) is used to be connected with valve stem (101), the fixed assembly (2) side is connected with vertical plate (3), the vertical plate (3) is connected with long plate (4) one end, the long plate (4) other end is connected with end plate (5), the end plate (5) is equipped with second threaded hole (51), the second threaded hole (51) is inserted with connecting bolt (52), the connecting bolt (52) is sleeved with universal joint (53), the lower end of universal joint (53) is connected with the feedback rod (11) of LVDT device (1).

2. The turbine feed pump LVDT arrangement of claim 1, wherein, The fixed assembly (2) includes first clamp block (21) and second clamp block (22), the side of first clamp block (21) is provided with first threaded hole (211) penetrating, the side of first clamp block (21) and second clamp block (22) is provided with arc-shaped clamping groove (6) respectively, the side of second clamp block (22) is provided with first through hole (221) penetrating, the side of vertical plate (3) is provided with second through hole (31) penetrating, fastening bolt (7) is screwed into the first threaded hole (211) of first clamp block (21) by penetrating second through hole (31) and first through hole (221).

3. The turbine feed pump LVDT arrangement of claim 2, wherein, The surface of arc-shaped clamping groove (6) of first clamp block (21) and second clamp block (22) is provided with rubber non-slip pad.

4. The turbine feed pump LVDT arrangement of claim 1, wherein, The end plate (5) is provided with two second threaded holes (51), the two second threaded holes (51) are respectively inserted with connecting bolt (52), each connecting bolt (52) is sleeved with universal joint (53), the lower end of universal joint (53) is connected with feedback rod (11).

5. The turbine feed pump LVDT arrangement of claim 1, wherein, The edges of vertical plate (3), long plate (4) and end plate (5) are provided with round chamfer.

6. The turbine feed pump LVDT arrangement of claim 2, wherein, The tail end of fastening bolt (7) is provided with nut ring (71).

7. The turbine feed pump LVDT apparatus of any one of claims 1-6, wherein, The lower end surface of long plate (4) is connected with baffle (41). The tail end of fastening bolt (7) is provided with nut ring (71).

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