Negative pressure type electromagnetic flowmeter for collecting water flow signals of power station main transformer cooler

Abstract

The utility model relates to the field of electromagnetic flow meter devices, aims to solve the problems that in the prior art, an electromagnetic flow meter is poor in internal anti-impact capacity, poor in stability, poor in negative pressure capacity and difficult to meet the use requirement of a power station main transformer cooler for a long time, and provides a negative pressure type electromagnetic flow meter used for collecting water flow signals of the power station main transformer cooler. Comprising a negative pressure measuring tube; the outer wall of the negative pressure measuring tube is fixedly sleeved with a protective outer shell, and a cavity is formed. The outer wall of the protective outer shell is radially connected with a wire pipe and a conversion display; the negative pressure measuring tube is provided with a cylindrical negative pressure fence, the outer side of the cylindrical negative pressure fence is sleeved with a tube outer protection tube layer, a lining tube layer is inserted into the cylindrical negative pressure fence, the tube outer protection tube layer is in bolted connection with the cylindrical negative pressure fence, and the outer wall of the lining tube layer is limited on the cylindrical negative pressure fence. The utility model has the beneficial effects that the anti-impact capability, the stability and the negative pressure capability of the lining cylinder layer are improved, and the lining cylinder layer can work on a large-flow and high-pressure water conveying pipeline of the main side cooler of the transformer substation for a long time.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic flowmeter devices, and more specifically, to a negative pressure type electromagnetic flowmeter for collecting water flow signals of main transformer coolers in power stations. Background Art

[0002] During the operation of power station equipment, a large amount of heat is generated. If not cooled in time, it will damage the equipment. Currently, most power station main transformers adopt the forced oil circulation water cooling method. Each main transformer is equipped with six forced oil circulation water coolers. The cooler control system withdraws and puts into operation a certain number of auxiliary coolers according to the load size, oil level, winding temperature, etc. of the transformer. During the process of withdrawing and putting into operation the coolers, it is often disturbed by the water flow signal, resulting in repeated actions of abnormal water flow signals. After the signal acts, the cooler control system will automatically judge that the cooler is in a fault state and put into operation the standby cooler, which to a certain extent affects the safe and stable operation level of the equipment. At the same time, it seriously affects the monitoring efficiency of the operating personnel, increases the maintenance workload and maintenance cost. In order to reduce the false alarm rate and maintenance cost, some power stations use electromagnetic flowmeters as monitoring equipment for the water flow of coolers to improve their detection accuracy.

[0003] However, the water flow of the main transformer cooler in the power station is large, which will cause a large impact on the inside of the electromagnetic flowmeter during its operation. At the same time, the negative pressure is also large. It is difficult for the lining of ordinary electromagnetic flowmeters to meet the use of the main transformer cooler in the power station for a long time. Summary of the Utility Model

[0004] The utility model aims to provide a negative pressure type electromagnetic flowmeter for collecting water flow signals of main transformer coolers in power stations, so as to solve the problems of poor internal anti-impact ability, poor stability, poor negative pressure ability and difficulty in meeting the use of main transformer coolers in power stations for a long time in the prior art.

[0005] The embodiments of the utility model are implemented as follows:

[0006] The embodiment of the utility model provides a negative pressure type electromagnetic flowmeter for collecting water flow signals of main transformer coolers in power stations, which includes a negative pressure measuring tube;

[0007] A protective outer casing is sleeved on the outer wall of the negative pressure measuring tube. The protective outer casing is fixedly connected to the outer wall of the negative pressure measuring tube, and there is a cavity between the outer wall of the negative pressure measuring tube and the protective outer casing;

[0008] A wire tube is fixedly connected to the outer wall of the protective outer casing in the radial direction. The wire tube communicates with the cavity, and one end of the wire tube away from the protective outer casing is fixedly connected with a conversion display;

[0009] The above-mentioned negative pressure measuring pipe has a cylindrical negative pressure fence. An outer protective cylinder layer is sleeved outside the cylindrical negative pressure fence. A lining cylinder layer is inserted into the cylinder cavity of the cylindrical negative pressure fence. The outer protective cylinder layer is bolted to the cylindrical negative pressure fence, and the outer wall of the lining cylinder layer is limited on the cylindrical negative pressure fence.

[0010] During use, after cutting the vertical cooling water pipe, both ends of the negative pressure type electromagnetic flowmeter are respectively installed at both ends of the cut cooling water pipe. The cooling water with a larger water flow impacts the lining cylinder layer of the above-mentioned negative pressure measuring pipe. Through the cooperation of the cylindrical negative pressure fence and the lining cylinder layer, the impact resistance, stability and negative pressure capacity of the lining cylinder layer are improved. The outer protective cylinder layer can effectively protect the internal components. The conversion display on the protective housing collects the water flow of the cooler through the above-mentioned wire pipe. Finally, the conversion display converts and displays the collected signal, which is convenient for detecting and controlling the water flow of the cooler during the cooling cycle in the power station.

[0011] In the negative pressure type electromagnetic flowmeter for collecting the water flow signal of the main transformer cooler in the power station disclosed in this embodiment, since the cylindrical negative pressure fence and the lining cylinder layer that cooperate with each other are provided inside the outer protective cylinder layer, the negative pressure type electromagnetic flowmeter for collecting the water flow signal of the main transformer cooler has the beneficial effects of improving the impact resistance, stability and negative pressure capacity of the lining cylinder layer through the cooperation of the lining negative pressure reinforcing ribs and the cylindrical negative pressure fence. The electrodes are protected by the conical ring plugs, and the sealing effect is better as the water pressure increases, and it can work on the water conveyance pipeline of the main transformer cooler in the substation with large flow and high pressure for a long time.

[0012] Optionally: Electrodes are provided in the radial direction of the above-mentioned negative pressure measuring pipe. One end of the electrode extends into the interior of the above-mentioned negative pressure measuring pipe, and the other end of the electrode extends into the above-mentioned cavity and does not contact the outer protective cylinder layer. The conversion display collects the cooling water flow data in the above-mentioned negative pressure measuring pipe through the above-mentioned wire pipe and the electrode.

[0013] With such a setting, the above-mentioned conversion display is used to convert and display the detected signal, which is convenient for detecting and controlling the water flow of the cooler during the cooling cycle in the power station. At the same time, it is convenient for the staff to directly see the water flow of the cooling water on the above-mentioned conversion display, thereby realizing the collection and display of the cooling water flow data and facilitating the staff to adjust the water flow of the cooling water.

[0014] Optionally: A first measurement installation flange and a second measurement installation flange are respectively provided at both ends of the above-mentioned negative pressure measuring pipe. The first measurement installation flange and the second measurement installation flange are respectively fixedly connected to both ends of the above-mentioned outer protective cylinder layer.

[0015] With such a setting, the above-mentioned first measurement and installation flange and the above-mentioned second measurement and installation flange are convenient for installing with the cold water pipe of the main transformer cooler. During installation, the cold water pipe needs to be cut, and then the corresponding flanges are welded to achieve the docking, assembly and fixation of the corresponding flanges with the above-mentioned first measurement and installation flange and the above-mentioned second measurement and installation flange.

[0016] Optionally: A number of fence strip grooves are provided axially on the above-mentioned cylindrical negative pressure fence, and a number of lining negative pressure reinforcing ribs are fixedly installed on the outer side wall of the above-mentioned inner lining cylinder layer. There are at least three of the above-mentioned lining negative pressure reinforcing ribs, the number of the above-mentioned fence strip grooves is greater than the number of the above-mentioned lining negative pressure reinforcing ribs, and the above-mentioned lining negative pressure reinforcing ribs are embedded in the above-mentioned fence strip grooves.

[0017] With such a setting, it not only increases the structural stability of the above-mentioned inner lining cylinder layer, but also enhances the negative pressure capacity of the above-mentioned inner lining cylinder layer, and thus can better withstand the internal impact of the large water flow of the power station main transformer cooler on the electromagnetic flowmeter.

[0018] Optionally: The above-mentioned cylindrical negative pressure fence has an end ring and a number of cylindrically arranged connecting fence strips. One end of the above-mentioned connecting fence strips close to the above-mentioned cylindrical negative pressure fence is integrally formed with the above-mentioned cylindrical negative pressure fence. A retaining end ring is provided at the end of the above-mentioned connecting fence strips far from the above-mentioned cylindrical negative pressure fence, and the end of the above-mentioned connecting fence strips far from the above-mentioned cylindrical negative pressure fence is fixedly connected to the above-mentioned retaining end ring by screws.

[0019] With such a setting, it is beneficial to first sleeved the integral structure of the above-mentioned end ring and the above-mentioned connecting fence strips axially along the above-mentioned lining negative pressure reinforcing ribs on the outer side wall of the above-mentioned inner lining cylinder layer, and then fixed by the above-mentioned retaining end ring, so that the above-mentioned inner lining cylinder layer is limited on the above-mentioned cylindrical negative pressure fence. Through the cooperation of the above-mentioned lining negative pressure reinforcing ribs and the above-mentioned cylindrical negative pressure fence, the anti-impact ability, stability and negative pressure capacity of the above-mentioned inner lining cylinder layer are improved.

[0020] Optionally: The above-mentioned lining negative pressure reinforcing ribs and the above-mentioned inner lining cylinder layer are provided with communicating frustum-shaped holes, a frustum-shaped ring plug is embedded in the above-mentioned frustum-shaped holes, the above-mentioned electrode is inserted axially inside the above-mentioned frustum-shaped ring plug, one end of the above-mentioned electrode extends into the above-mentioned inner lining cylinder layer, and the other end of the above-mentioned electrode extends into the above-mentioned cavity and does not contact the above-mentioned outer pipe protection cylinder layer.

[0021] With such a setting, the above-mentioned electrode is used to transfer the electromotive force of the fluid in the magnetic field environment. The above-mentioned electrode is protected by the above-mentioned frustum-shaped ring plug. As the water pressure increases, the sealing effect at the above-mentioned electrode on the above-mentioned inner lining cylinder layer is better, and thus the above-mentioned inner lining cylinder layer can work on the water delivery pipeline of the main transformer cooler in the substation with large flow and high pressure for a long time.

[0022] Optionally, a protective plug ring is sleeved on one end of the above-mentioned electrode close to the above-mentioned protective housing, and the above-mentioned protective plug ring is fixedly connected to the above-mentioned outer tube protective cylinder layer.

[0023] With this setting, the above-mentioned electrode is further protected by the above-mentioned protective plug ring.

[0024] Optionally, the above-mentioned wire tube has a first half tube and a second half tube, the above-mentioned first half tube and the above-mentioned second half tube are coaxial with each other, and one end of the above-mentioned first half tube and the above-mentioned second half tube connected to each other respectively has a first half tube flange and a second half tube flange, and the above-mentioned first half tube flange is bolted to the above-mentioned second half tube flange.

[0025] With this setting, it is beneficial to disassemble and assemble the above-mentioned conversion display, and at the same time, it is convenient to disassemble, repair or extend the above-mentioned wire tube, so as to adapt to different working environments.

[0026] Optionally, a number of evenly distributed fence screws are provided in the radial direction of the above-mentioned outer tube protective cylinder layer, and the above-mentioned outer tube protective cylinder layer is connected to the above-mentioned cylindrical negative pressure fence through a number of the above-mentioned fence screws.

[0027] With this setting, the connection through a number of the above-mentioned fence screws not only ensures the sealing performance and fixed connection, but also facilitates disassembly and assembly, which is beneficial to checking the state of the above-mentioned cylindrical negative pressure fence.

[0028] Optionally, compensation ring grooves are provided on the outer side cross-sections of the above-mentioned first measurement installation flange and the above-mentioned second measurement installation flange, and an inner lining compensation end ring plate is installed in the above-mentioned compensation ring groove, and the above-mentioned inner lining compensation end ring plate is integrally connected to the above-mentioned inner lining cylinder layer.

[0029] With this setting, the above-mentioned inner lining compensation end ring plate is actually formed by hot pressing the end of the above-mentioned inner lining cylinder layer, which is beneficial to limiting the above-mentioned first measurement installation flange, the above-mentioned second measurement installation flange, the above-mentioned cylindrical negative pressure fence and the above-mentioned outer tube protective cylinder layer through the above-mentioned inner lining cylinder layer, so that they form a whole, thereby improving the anti-impact ability, stability and negative pressure ability of the above-mentioned inner lining cylinder layer.

[0030] Based on the above description, the negative pressure type electromagnetic flowmeter disclosed by the present utility model for collecting water flow signals of a power station main transformer cooler has the beneficial effects that the anti-impact ability, stability and negative pressure ability of the above-mentioned inner lining cylinder layer can be improved through the cooperation of the above-mentioned lining negative pressure reinforcing ribs and the above-mentioned cylindrical negative pressure fence, the above-mentioned electrode is protected by the above-mentioned conical ring plug, and the sealing effect is better as the water pressure increases, and it can work on the water delivery pipeline of the main transformer cooler of a substation with large flow and high pressure for a long time. Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant accompanying drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a negative pressure type electromagnetic flowmeter for collecting water flow signals of the main transformer cooler in the power station in the embodiment of the present utility model;

[0033] Figure 2 It is a cross-sectional view of a negative pressure type electromagnetic flowmeter for collecting water flow signals of the main transformer cooler in the power station in the embodiment of the present utility model;

[0034] Figure 3 It is a schematic structural diagram of a cylindrical negative pressure fence in the embodiment of the present utility model;

[0035] Figure 4 For the embodiment of the present utility model Figure 2 The enlarged schematic diagram at position A in the embodiment.

[0036] Icons: 1 - negative pressure measurement tube, 2 - protective outer housing, 3 - cavity, 4 - wire tube, 5 - conversion display, 6 - cylindrical negative pressure fence, 7 - outer tube protection layer, 8 - inner lining tube layer, 9 - electrode, 10 - first measurement installation flange, 11 - second measurement installation flange, 12 - fence strip groove, 13 - lining negative pressure strengthening rib, 14 - end ring, 15 - connecting grid strip, 16 - end blocking ring, 17 - tapered hole, 18 - tapered ring plug, 19 - protective plug ring, 20 - first half tube, 21 - second half tube, 22 - first half tube flange, 23 - second half tube flange, 24 - fence screw, 25 - compensation ring groove, 26 - inner lining compensation end ring plate, 27 - coil iron core assembly. Specific embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0038] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] Embodiment

[0040] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , this embodiment proposes a negative pressure type electromagnetic flowmeter for collecting water flow signals of the main transformer cooler in a power station, including a negative pressure measuring tube 1;

[0041] A protective outer casing 2 is sleeved on the outer wall of the negative pressure measuring tube 1, the protective outer casing 2 is fixedly connected to the outer wall of the negative pressure measuring tube 1, and a cavity 3 is formed between the outer wall of the negative pressure measuring tube 1 and the protective outer casing 2;

[0042] A wire tube 4 is fixedly connected to the outer wall of the protective outer casing 2 in the radial direction, the wire tube 4 communicates with the cavity 3, and one end of the wire tube 4 away from the protective outer casing 2 is fixedly connected to a conversion display 5;

[0043] The negative pressure measuring tube 1 has a cylindrical negative pressure fence 6, an outer tube protection cylinder layer 7 is sleeved outside the cylindrical negative pressure fence 6, a lining cylinder layer 8 is inserted into the cylindrical cavity of the cylindrical negative pressure fence 6, the outer tube protection cylinder layer 7 is bolted to the cylindrical negative pressure fence 6, and the outer wall of the lining cylinder layer 8 is limited on the cylindrical negative pressure fence 6.

[0044] During use, after cutting the vertical cooling water pipeline, both ends of the negative pressure type electromagnetic flowmeter are respectively installed at both ends of the cut cooling water pipeline. The cooling water with a large water flow impacts the lining cylinder layer 8 of the negative pressure measuring tube 1. The cooperation between the cylindrical negative pressure fence 6 and the lining cylinder layer 8 improves the anti-impact ability, stability and negative pressure ability of the lining cylinder layer 8. The outer tube protection cylinder layer 7 can effectively protect the internal components. The conversion display 5 on the protective outer casing 2 collects the water flow of the cooler through the wire tube 4. Finally, the conversion display 5 converts and displays the collected signals, which is convenient for detecting and controlling the flow rate of the cooling water of the cooler during the cooling cycle of the power station.

[0045] The negative-pressure electromagnetic flowmeter for collecting the water flow signal of the main transformer cooler in the power station disclosed in this implementation scheme has a cylindrical negative-pressure fence 6 and a lining cylinder layer 8 that are cooperatively connected inside the outer protection cylinder layer 7, so that the negative-pressure electromagnetic flowmeter for collecting the water flow signal of the main transformer cooler in the power station has the cooperation of the lining negative-pressure reinforcing ribs 13 and the cylindrical negative-pressure fence 6, which improves the impact resistance, stability and negative-pressure capacity of the lining cylinder layer 8. The electrode 9 is protected by a frustum ring plug 18, and the sealing effect is better as the water pressure increases. It can work on the water delivery pipeline of the main transformer cooler in the substation with large flow and high pressure for a long time with beneficial effects.

[0046] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , on the radial direction of the negative-pressure measuring tube 1, there is an electrode 9. One end of the electrode 9 extends into the interior of the negative-pressure measuring tube 1, and the other end of the electrode 9 extends into the cavity 3 and does not contact the outer protection cylinder layer 7. The conversion display 5 collects the cooling water flow data in the negative-pressure measuring tube 1 through the wire tube 4 and the electrode 9. The conversion display 5 is used to convert and display the detected signal, which is convenient for detecting and controlling the flow rate of the cooling water in the cooling cycle of the power station. At the same time, it is convenient for the staff to directly see the flow rate of the cooling water on the conversion display 5, thereby realizing the collection and display of the cooling water flow data and facilitating the staff to adjust the flow rate of the cooling water.

[0047] Both ends of the negative-pressure measuring tube 1 are respectively provided with a first measuring mounting flange 10 and a second measuring mounting flange 11. The first measuring mounting flange 10 and the second measuring mounting flange 11 are respectively fixedly connected to both ends of the outer protection cylinder layer 7. The first measuring mounting flange 10 and the second measuring mounting flange 11 are convenient for installing with the cold water pipe of the main transformer cooler. During installation, the cold water pipe needs to be cut, and then the corresponding flange is welded to realize the butt joint and assembly fixation of the corresponding flange with the first measuring mounting flange 10 and the second measuring mounting flange 11.

[0048] There are several fence strip grooves 12 on the axial direction of the cylindrical negative-pressure fence 6. Several lining negative-pressure reinforcing ribs 13 are fixedly installed on the outer side wall of the lining cylinder layer 8. There are at least three several lining negative-pressure reinforcing ribs 13. The number of several fence strip grooves 12 is greater than the number of several lining negative-pressure reinforcing ribs 13. Several lining negative-pressure reinforcing ribs 13 are embedded in several fence strip grooves 12. In this way, it not only increases the structural stability of the lining cylinder layer 8, but also strengthens the negative-pressure capacity of the lining cylinder layer 8, and can better withstand the internal impact of the large water flow of the main transformer cooler in the power station on the electromagnetic flowmeter.

[0049] See Figure 1 , Figure 2 , Figure 3 and Figure 4, the cylindrical negative pressure fence 6 has an end ring 14 and a number of connecting fence bars 15 arranged in a cylindrical shape. One end of the number of connecting fence bars 15 close to the cylindrical negative pressure fence 6 is integrally formed with the cylindrical negative pressure fence 6. A retaining end ring 16 is provided at the end of the number of connecting fence bars 15 far from the cylindrical negative pressure fence 6. The end of the connecting fence bar 15 far from the cylindrical negative pressure fence 6 is fixedly connected to the retaining end ring 16 by screws. Such a setting is beneficial to first sleeving the integral structure of the end ring 14 and the number of connecting fence bars 15 along the axial direction of the number of lining negative pressure reinforcing ribs 13 on the outer side wall of the inner lining cylinder layer 8, and then fixing it through the retaining end ring 16. In this way, the inner lining cylinder layer 8 is limited on the cylindrical negative pressure fence 6. Through the cooperation of the number of lining negative pressure reinforcing ribs 13 and the cylindrical negative pressure fence 6, the anti-impact ability, stability and negative pressure ability of the inner lining cylinder layer 8 are improved.

[0050] Conical holes 17 communicating with each other are provided on the lining negative pressure reinforcing ribs 13 and the inner lining cylinder layer 8. A conical ring plug 18 is embedded in the conical hole 17. The electrode 9 is inserted axially inside the conical ring plug 18. One end of the electrode 9 extends into the inner lining cylinder layer 8, and the other end of the electrode 9 extends into the cavity 3 and does not contact the outer tube protection cylinder layer 7. The electrode 9 is used to transmit the electromotive force of the fluid in the magnetic field environment. The electrode 9 is protected by the conical ring plug 18. As the water pressure increases, the sealing effect at the electrode 9 on the inner lining cylinder layer 8 is better. Furthermore, the inner lining cylinder layer 8 can work on the water delivery pipeline of the main side cooler of the substation with large flow and high pressure for a long time.

[0051] A protective plug ring 19 is sleeved on one end of the electrode 9 close to the protective housing 2. The protective plug ring 19 is fixedly connected to the outer tube protection cylinder layer 7. In this way, the electrode 9 is further protected by the protective plug ring 19.

[0052] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , the wire tube 4 has a first half tube 20 and a second half tube 21. The first half tube 20 and the second half tube 21 are coaxial with each other. One end of the first half tube 20 and the second half tube 21 connected to each other respectively has a first half tube flange 22 and a second half tube flange 23. The first half tube flange 22 is bolted to the second half tube flange 23. This is beneficial to disassembling and assembling the conversion display 5. At the same time, it is convenient to disassemble, repair or extend the wire tube 4, so as to adapt to different working environments.

[0053] A number of uniformly distributed fence screws 24 are provided in the radial direction of the outer tube protection cylinder layer 7. The outer tube protection cylinder layer 7 is connected to the cylindrical negative pressure fence 6 through a number of fence screws 24. Connecting through a number of fence screws 24 not only ensures the sealing performance and fixed connection, but also is convenient for disassembly and assembly, which is beneficial to checking the state of the cylindrical negative pressure fence 6.

[0054] On the outer cross-sections of the first measurement mounting flange 10 and the second measurement mounting flange 11, compensation ring grooves 25 are provided. An inner lining compensation end ring disc 26 is installed in the compensation ring grooves 25. The inner lining compensation end ring disc 26 is integrally connected with the inner lining cylinder layer 8. The inner lining compensation end ring disc 26 is actually formed by hot pressing the end of the inner lining cylinder layer 8. This is beneficial to limit the first measurement mounting flange 10, the second measurement mounting flange 11, the cylindrical negative pressure fence 6, and the outer pipe protection cylinder layer 7 through the inner lining cylinder layer 8, making them form a whole, thereby improving the impact resistance, stability, and negative pressure capacity of the inner lining cylinder layer 8.

[0055] A coil iron core assembly 27 is installed in the cavity 3 between the negative pressure measurement pipe 1 and the protective housing 2. The coil iron core assembly 27 is the main component that generates a magnetic field for the electromagnetic flowmeter. There are already mature technologies in the prior art, and no further elaboration will be made here.

[0056] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In this embodiment, the cooperation between the inner lining cylinder layer 8 and the cylindrical negative pressure fence 6, as well as the inner lining compensation end ring disc 26 formed by hot pressing at both ends of the inner lining cylinder layer 8, both play a role in improving the impact resistance, stability, and negative pressure capacity of the inner lining cylinder layer 8.

[0057] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In this embodiment, the specific working principle of the negative pressure type electromagnetic flowmeter for collecting the water flow signal of the power station main transformer cooler:

[0058] First of all, the negative pressure type electromagnetic flowmeter is mainly used to be installed on the transformer cooling device of power station equipment. The power station main transformer adopts the forced oil circulation water cooling method. The forced oil circulation water coolers are mostly vertically arranged, and there will be an incoming cooling water pipe on the outside. Most of the cooling water pipes are vertically arranged. After cutting the vertical cooling water pipe and installing a flange, then, the first measurement mounting flange 10 and the second measurement mounting flange 11 of the negative pressure type electromagnetic flowmeter are respectively connected to the flanges at both ends after cutting the cooling water pipe.

[0059] When the cooling water in the cooling water pipe of the forced oil circulation water cooler passes through from bottom to top, the cooling water mainly impacts the negative pressure measurement pipe 1. And because it is often necessary to observe and maintain, the negative pressure type electromagnetic flowmeter will not be installed at too high a height. Therefore, it has to bear a certain height of water pressure. In this embodiment, through the cooperation of the negative pressure strengthening rib strips 13 on the outside of the inner lining cylinder layer 8 and the cylindrical negative pressure fence 6, the impact resistance, stability, and negative pressure capacity of the inner lining cylinder layer 8 are improved, and it can work on the water delivery pipe of the main transformer cooler in the substation with large flow and high pressure for a long time.

[0060] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , in this embodiment, when the negative pressure measurement tube 1 is produced, first, the cylindrical negative pressure fence 6 is installed inside the outer protective tube layer 7 of the tube, and then the inner lining tube layer 8 is inserted into the cylindrical negative pressure fence 6. Among them, several negative pressure reinforcing ribs 13 are inserted into several fence bar grooves 12. After insertion, the end blocking ring 16 is installed and fixed, and then the two ends of the inner lining tube layer 8 are hot-pressed into the compensation ring groove 25 through a hot-pressing device to form an inner lining compensation end ring plate.

[0061] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , in this embodiment, the negative pressure type electromagnetic flowmeter for collecting the water flow signal of the main transformer cooler in the power station is improved on the basis of the existing technology. By setting the inner lining tube layer 8 and the cylindrical negative pressure fence 6 to cooperate with each other, the impact resistance, stability and negative pressure capacity of the inner lining tube layer 8 are improved. The electrode 9 is protected by the conical ring plug 18, and the sealing effect is better as the water pressure increases, and it can work on the water conveyance pipeline of the main transformer cooler in the substation with large flow and high pressure for a long time.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Negative pressure electromagnetic flowmeter used for collecting water flow signals of power station main transformer cooler, characterized by: It comprises a negative pressure measuring tube (1); A protective outer shell (2) is sleeved on the outer wall of the negative pressure measuring tube (1), the protective outer shell (2) is fixedly connected to the outer wall of the negative pressure measuring tube (1), and a cavity (3) is provided between the outer wall of the negative pressure measuring tube (1) and the protective outer shell (2); A wire tube (4) is fixedly connected to the outer wall of the protective outer shell (2) in the radial direction, the wire tube (4) is connected to the cavity (3), and one end of the wire tube (4) away from the protective outer shell (2) is fixedly connected to a conversion display (5); The negative pressure measuring tube (1) has a cylindrical negative pressure fence (6), the outer side of the cylindrical negative pressure fence (6) is provided with an outer tube protection tube layer (7), the inner tube lining layer (8) is inserted into the tube cavity of the cylindrical negative pressure fence (6), the outer tube protection tube layer (7) is bolted to the cylindrical negative pressure fence (6), and the outer wall of the inner tube lining layer (8) is limited on the cylindrical negative pressure fence (6).

2. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 1 is characterized in that: An electrode (9) is provided in the radial direction of the negative pressure measuring tube (1), one end of the electrode (9) extends into the interior of the negative pressure measuring tube (1), and the other end of the electrode (9) extends into the cavity (3) and does not contact the outer protective tube layer (7) of the tube. The conversion display (5) collects cooling water flow data in the negative pressure measuring tube (1) through the wire tube (4) and the electrode (9).

3. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 1 is characterized in that: The two ends of the negative pressure measuring tube (1) are respectively provided with a first measuring mounting flange (10) and a second measuring mounting flange (11); the first measuring mounting flange (10) and the second measuring mounting flange (11) are respectively fixedly connected to the two ends of the outer protective tube layer (7) of the tube.

4. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 2 is characterized in that: The cylindrical negative pressure fence (6) is provided with a plurality of fence bar grooves (12) in the axial direction, and a plurality of lining negative pressure reinforcing ribs (13) are fixedly installed on the outer wall of the inner lining cylinder layer (8), and at least three of the plurality of lining negative pressure reinforcing ribs (13) are provided, and the number of the plurality of fence bar grooves (12) is greater than the number of the plurality of lining negative pressure reinforcing ribs (13), and the plurality of lining negative pressure reinforcing ribs (13) are embedded in the plurality of fence bar grooves (12).

5. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 4 is characterized in that: The cylindrical negative pressure fence (6) comprises an end ring (14) and a plurality of cylindrically arranged connecting bars (15), wherein one end of the plurality of connecting bars (15) close to the cylindrical negative pressure fence (6) is integrally formed with the cylindrical negative pressure fence (6), and one end of the plurality of connecting bars (15) away from the cylindrical negative pressure fence (6) is provided with a retaining end ring (16), and the end of the connecting bar (15) away from the cylindrical negative pressure fence (6) is fixedly connected to the retaining end ring (16) by screws.

6. The negative pressure electromagnetic flowmeter for collecting water flow signals of a main transformer cooler of a power station according to claim 4 is characterized in that: The negative pressure reinforcing ribs (13) and the inner lining layer (8) are provided with a connected conical hole (17), a conical ring plug (18) is embedded in the conical hole (17), and the electrode (9) is inserted in the inner axial direction of the conical ring plug (18), one end of the electrode (9) extends into the inner lining layer (8), and the other end of the electrode (9) extends into the cavity (3) and does not contact the outer protective tube layer (7).

7. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 6 is characterized in that: A protective plug ring (19) is sleeved on one end of the electrode (9) close to the protective outer shell (2), and the protective plug ring (19) is fixedly connected to the outer protective tube layer (7).

8. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 1 is characterized in that: The wire pipe (4) comprises a first wire half pipe (20) and a second wire half pipe (21); the first wire half pipe (20) and the second wire half pipe (21) are coaxial with each other; one end of the first wire half pipe (20) and the second wire half pipe (21) connected to each other comprises a first half pipe flange (22) and a second half pipe flange (23); the first half pipe flange (22) is bolted to the second half pipe flange (23).

9. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 1 is characterized in that: A plurality of evenly distributed fence screws (24) are provided in the radial direction of the outer tube protection tube layer (7), and the outer tube protection tube layer (7) is connected to the cylindrical negative pressure fence (6) via the plurality of fence screws (24).

10. The negative pressure electromagnetic flowmeter for collecting water flow signals of a power station main transformer cooler according to claim 3 is characterized in that: The first measuring mounting flange (10) and the second measuring mounting flange (11) are provided with compensation ring grooves (25) on their outer cross sections, and liner compensation end ring discs (26) are installed in the compensation ring grooves (25), and the liner compensation end ring discs (26) are integrally connected to the liner barrel layer (8).

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