Device for measuring positive conductivity of water for washing steam generator of nuclear power plant
By designing a water-anometric conductivity measurement device for rinsing steam generators in nuclear power plant including pump machine, input tube, output tube, resin column, bracket, electrode and conductivity meter, the static water pressure in the prior art is solved and the measurement data are measured. Poor stability and poor accuracy of measurement results achieve more efficient and accurate measurement results.
Patent Information
- Application Number
- CN202420943387.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In the prior art, when conducting analysis of water conductivity for flushing steam generators in nuclear power plants, there are problems such as insufficient static water pressure, poor stability of measurement data and poor accuracy of measurement results.
A water-anometric conductivity measurement device for rinsing a steam generator for nuclear power plant including a pump machine, an input tube, an output tube, a resin column, a bracket, an electrode and a conductivity meter is designed. The water sample flow rate is adjusted through the pump machine, and the resin column is maintained through the bracket. In a vertical state, the electrode is arranged on the bracket to reduce manpower operation.
It improves the stability and accuracy of the measurement data, reduces manpower operation, improves work efficiency, and ensures that the flushing water can stably contact all areas inside the resin column.
Smart Images
Figure CN222461375U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of nuclear power plant steam generators, in particular to a device for measuring the positive conductivity of water for flushing nuclear power plant steam generators. Background Art
[0002] The steam generator must be flushed during each overhaul of a nuclear power plant unit. The requirements for flushing water used for steam generator flushing are very strict. The flushing water in the flushing water tank must be analyzed for cationic conductivity before and after flushing. In the prior art, when performing cationic conductivity analysis of steam generator flushing water, multiple people are required to assist in the operation at the same time. One person fixes the resin column by hand and aligns the inlet of the resin column with the sampling point of the flushing water tank; another person fixes the flow pool on one side of the resin column by hand. The outlet of the resin column is connected to the conductivity meter via a cable. The defects of this operation are: (1) The pipe diameter at the sampling point of the flushing water tank is smaller than the inlet pipe diameter of the resin column. In actual operation, the water flow at the sampling point relies on its own gravity to directly pour into the inlet of the resin column. The static water pressure is insufficient and the measurement data stabilizes slowly; (2) Due to the space limitation at the sampling point, the resin column can only remain in a tilted state during operation, making it difficult for the flushing water to stably contact the entire area inside the resin column, resulting in poor accuracy of the measurement results. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a device for measuring the positive conductivity of water used for flushing a steam generator in a nuclear power plant in view of at least one defect of the above-mentioned prior art.
[0004] The utility model solves the technical problem by adopting a technical solution: providing a device for measuring the positive conductivity of water for washing steam generators in nuclear power plants, which comprises a pump, an input pipe, an output pipe, a resin column, a bracket, electrodes, and a conductivity meter;
[0005] The input pipe includes a first end for connecting to a flushing water tank of a steam generator in a nuclear power plant and a second end connected to the pump; one end of the output pipe is connected to the pump, and the other end is connected to the input end of the resin column; the resin column is arranged on the bracket; the electrode is arranged on the bracket and is located on one side of the resin column; the output end of the resin column is connected to the electrode, and the electrode is connected to the conductivity meter.
[0006] Preferably, the bracket comprises a fixing portion and a supporting portion connected to each other, and the fixing portion defines a receiving area for accommodating the resin column.
[0007] Preferably, the fixing portion comprises a supporting plate, a plurality of limiting columns and a limiting ring; the limiting columns are connected between the supporting plate and the limiting ring, and the supporting plate, the limiting columns and the limiting ring together define the receiving area; and the supporting portion is connected to the limiting columns.
[0008] Preferably, the support plate is a circular plate or an annular plate.
[0009] Preferably, the device for measuring the positive conductivity of water used for flushing a steam generator in a nuclear power plant further comprises a circulation pool clamped between the limiting ring and the side wall of the resin column, and the electrode is installed in the circulation pool.
[0010] Preferably, the device for measuring the positive conductivity of water used for flushing steam generators in nuclear power plants further comprises a circulation cell;
[0011] The limiting ring includes a first limiting ring and a second limiting ring, the area of the annular region enclosed by the first limiting ring is larger than the area of the annular region enclosed by the second limiting ring, the first limiting ring is connected to the limiting column, the second limiting ring and the first limiting ring are connected via a connecting piece, the second limiting ring, the supporting plate and the limiting column define the receiving area together, the circulation pool is clamped between the second limiting ring and the first limiting ring, and the electrode is installed on the circulation pool.
[0012] Preferably, the supporting portion comprises a plurality of supporting columns and a base unit, one end of the supporting column is connected to the limiting column, and the other end is connected to the base unit.
[0013] Preferably, the base unit comprises a plurality of cushion blocks, and the cushion blocks are connected to the supporting columns in a one-to-one correspondence.
[0014] Preferably, the number of the supporting columns and the number of the cushion blocks are four respectively, and the ends of the four supporting columns away from the limiting columns are respectively connected to the four cushion blocks.
[0015] Preferably, the pump is a peristaltic pump.
[0016] The utility model has at least the following beneficial effects: after adding a pump between the resin column and the flushing water tank, the flow rate of the water sample flowing through the resin column can be adjusted, so that the measurement data can be stabilized quickly. The resin column can be stably supported and fixed by the bracket, and the resin column can rely on the bracket to maintain a vertical state, thereby ensuring that the water in the flushing water tank can flow through the entire area inside the resin column, increasing the accuracy of the measurement results. At the same time, the electrode can also be set on the bracket, and no more multiple people are required to operate the whole process, which reduces a lot of manpower and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments, in which:
[0018] Figure 1 It is a schematic diagram of system connection when performing cation conductivity analysis of steam generator flushing water in the prior art;
[0019] Figure 2 It is a schematic diagram of the structure of a device for measuring the positive conductivity of water for flushing a steam generator in a nuclear power plant in some embodiments of the utility model;
[0020] Figure 3 It is a structural schematic diagram of a device for measuring the positive conductivity of water for flushing a steam generator in a nuclear power plant in other embodiments of the utility model;
[0021] Figure 4 yes Figure 2 The structural schematic diagram of the bracket of the cation conductivity measuring device of the steam generator flushing water in the nuclear power plant is shown;
[0022] Figure 5 Schematic diagrams of the structures of brackets in other embodiments. DETAILED DESCRIPTION
[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.
[0024] like Figure 1 As shown, when the positive conductivity analysis of steam generator flushing water is performed in the prior art, multiple people are required to assist in the operation at the same time. One person fixes the resin column 3 by hand and aligns the entrance of the resin column 3 with the sampling point 8 of the flushing water tank 7. Another person fixes the circulation pool 52 on one side of the resin column 3 by hand. Even a third person is required to manually control the switch at the sampling point 8. The pipe diameter at the sampling point 8 of the flushing water tank 7 is smaller than the opening pipe diameter of the resin column 3. The water flow at the sampling point 8 can only rely on its own gravity to flow into the opening of the resin column 3. The static water pressure is insufficient and the data is slow to stabilize. In addition, the water outlet at the sampling point 8 is in a non-sealed state with the opening of the resin column 3. The water outlet at the sampling point 8 is in direct contact with the air. The measurement result will be affected by the carbon dioxide in the air, resulting in poor accuracy of the measurement result. In addition, due to the space limitation at the sampling point 8, the resin column 3 can only remain in a tilted state when working, making it difficult for the flushing water to stably contact the entire area inside the resin column 3, resulting in poor accuracy of the measurement result. In order to solve the above problems, the purpose of the invention of the utility model is to improve the accuracy of the measurement results of the cation conductivity of the steam generator flushing water, while reducing manpower and improving work efficiency.
[0025] like Figure 2 As shown, a device for measuring the positive conductivity of water for flushing a steam generator in a nuclear power plant (hereinafter referred to as the measuring device) in some embodiments of the utility model includes a pump 1, an input pipe 21, an output pipe 22, a resin column 3, a bracket 4, an electrode 51, and a conductivity meter 6.
[0026] The input pipe 21 includes a first end and a second end. The first end of the input pipe 21 is used to connect to the flushing water tank 7 of the steam generator of the nuclear power plant, and the second end of the input pipe 21 is connected to the pump 1. One end of the output pipe 22 is connected to the pump 1, and the other end is connected to the input end of the resin column 3. The output end of the resin column 3 is connected to the electrode 51, and the electrode 51 is connected to the conductivity meter 6. That is, the flushing water tank 7, the input pipe 21, the pump 1, the output pipe 22, the resin column 3, the electrode 51 and the conductivity meter 6 are connected in sequence, and the flushing water in the flushing water tank 7 flows through the input pipe 21, the output pipe 22, the resin column 3, the electrode 51 and the conductivity meter 6 at a preset flow rate under the suction force of the pump 1, and the conductivity meter 6 displays the positive conductivity data of the flushing water.
[0027] After the pump 1 is added between the resin column 3 and the flushing water tank 7, the flow rate of the water sample flowing through the resin column 3 can be adjusted so that the measured data can be stabilized quickly. After testing and comparison, when the prior art is used to measure the positive conductivity of the flushing water in the flushing water tank 7, it takes about 3 to 5 minutes to reach a stable state of the measured data; after the measurement device of the utility model is used, the flow rate of the water sample flowing through the resin column 3 is increased, and it takes about 1 minute and 50 seconds to reach a stable state of the measured data.
[0028] Moreover, after the pump 1 is added between the resin column 3 and the flushing water tank 7, the flow rate of the water sample flowing through the resin column 3 can be adjusted so that the flow rate of the water sample flowing through the resin column 3 meets the standard requirements. According to the requirements of the relevant industry standards (DL / T502.29-2006, Water vapor analysis method for thermal power plants, Part 29), the flow rate of the water sample flowing through the resin column 3 needs to reach 300mL / min. According to the relationship between the flow rate and the inner diameter of the resin column 3, the water sample flow rate that should be achieved for the inner diameter of the resin column 3 of 40mm should be 400ml / min. In the prior art, the water sample is drawn to the resin column 3 only by the deadweight of the water flow in the flushing water tank 7, and the flow rate of the water sample flowing through the resin column 3 cannot meet the standard requirements. After testing, after using the measuring device of the utility model, relying on the suction force of the pump 1, the maximum flow rate of the water sample flowing through the resin column 3 can reach 600ml / min, which fully meets the requirements of the relevant standards.
[0029] Among them, the resin column 3 is arranged on the bracket 4. The electrode 51 is arranged on the bracket 4 and is located on one side of the resin column 3. Therefore, the resin column 3 can be stably supported and fixed by the bracket 4, and the resin column 3 can rely on the bracket 4 to maintain a vertical state, thereby ensuring that the water in the flushing water tank 7 can flow through the entire internal area of the resin column 3, thereby increasing the accuracy of the measurement result. At the same time, the electrode 51 can also be fixed on the bracket 4, and there is no need for multiple people to operate the whole process. Only one person is needed to record the data of the conductivity meter 6, which reduces a lot of manpower and improves work efficiency. The pump 1 and the flushing water tank 7 are connected by an input pipe 21. The input pipe 21 can be directly put into the flushing water tank 7 from the top of the flushing water tank 7. Therefore, the water flow path can be in a sealed environment, thereby avoiding the interference of carbon dioxide in the air on the measurement result. Alternatively, it can also be as follows Figure 3 As shown, the first end of the input pipe 21 is connected to the sampling point 8 on the flushing water tank 7. It is only necessary to select an input pipe 21 with a diameter consistent with that at the sampling point 8, or to set a pipe seal between the input pipe 21 and the sampling point 8.
[0030] Please refer to Table 1 below, which shows the test results of multiple positive conductivity of flushing water in the flushing water tank 7 before flushing the steam generator, where SG1, SG2 and SG3 represent the flushing water tanks 7 corresponding to three different units (corresponding to three different steam generators). Y100, Y101, Y102, Y201, Y301 and Y400 are respectively Figure 1The test number of measuring the positive conductivity of the flushing water in the flushing water tank 7 by the prior art method is shown, and Y202 is the test number of measuring the positive conductivity of the flushing water in the flushing water tank 7 by the measuring device of the utility model. The units of the data in the table are all μs / cm. From the comparison of the 7 data, it can be seen that the last column of data 0.85, 1.02 and 0.85 are all smaller than the data in the previous column, that is, for the flushing water in the flushing water tank 7 before flushing the steam generator, the positive conductivity data measured by the measuring device of the utility model is smaller than the data measured by the prior art. According to general principles, the cleaner the water quality, that is, the fewer impurities, the smaller the positive conductivity data. According to standard requirements, the positive conductivity of the flushing water in the flushing water tank 7 before flushing the steam generator should be less than 2μs / cm. The flushing water in the flushing water tank 7 before flushing the steam generator is SED (nuclear island desalted water distribution system) water treated by filtering and desalting technology, and the pH has been pre-adjusted to 8.8-10.0. The pH of the water is usually between 9.2 and 9.5. The devices used to measure the positive conductivity have been rinsed before filling the water. Under this premise, the water quality of the flushing water in the flushing water tank 7 before flushing the steam generator is theoretically relatively clean, so the smaller the measured positive conductivity data, the closer it is to the true value. Therefore, from the comparison of the 7 columns of data in Table 1, it can be seen that for the flushing water in the flushing water tank 7 before flushing the steam generator, the positive conductivity obtained by the measuring device of the utility model is smaller than the positive conductivity data obtained by the prior art, and is closer to the true value. Combined with the cause analysis, it can be seen that the prior art is affected by factors such as uneven water flow rate, insufficient flow rate, and carbon dioxide in the air, and the measured data will have certain errors. The use of the measuring device of the utility model increases the stability of the water flow rate, improves the water flow rate, and avoids the influence of factors such as carbon dioxide in the air, so that the measured cathodic conductivity data shows a decreasing trend and is closer to the true value.
[0031] Y100 Y101 Y102 Y201 Y301 Y400 Y202 SG1 1.83 1.26 1.39 1.653 1.48 1.07 0.85 SG2 1.06 1.88 1.08 1.465 0.94 1.03 1.02 SG3 1.38 1.85 1.25 1.468 1.22 0.96 0.85
[0032] Table 1
[0033] like Figure 4As shown, in some embodiments, the bracket 4 includes a fixed portion 41 and a supporting portion 42 connected to each other, and the fixed portion 41 defines a receiving area 43 for accommodating the resin column 3. The resin column 3 is received in the receiving area 43 and is limited by the fixed portion 41. The shape of the receiving area 43 can be set with reference to the shape of the resin column 3, so that the resin column 3 can be just limited in the receiving area 43. For example, the receiving area 43 can be cylindrical and just fit the cylindrical resin column 3. The supporting portion 42 mainly provides support for the fixed portion 41, so that the fixed portion 41 can be set upright, so that the resin column 3 can stably maintain an upright posture in the receiving area 43, thereby ensuring that the water in the flushing water tank 7 can flow through the entire area inside the resin column 3, thereby increasing the accuracy of the measurement results.
[0034] Furthermore, if Figure 4 As shown, in some embodiments, the fixing portion 41 includes a support plate 411, a plurality of limiting posts 412 and a limiting ring 413. The number of limiting posts 412 can be as follows: Figure 4 Two are shown, but other numbers are possible. The limiting column 412 is connected between the support plate 411 and the limiting ring 413, and the support plate 411, the limiting column 412 and the limiting ring 413 together define a receiving area 43. The support portion 42 is connected to the limiting column 412. When the resin column 3 is placed in the receiving area 43, its bottom end face is supported on the support plate 411, and its circumferential side wall is limited by the limiting column 412 and the limiting ring 413. That is, the support plate 411, the limiting column 412 and the limiting ring 413 can together define a cylindrical receiving area 43, and the resin column 3 is placed into the receiving area 43 from the limiting ring 413 from top to bottom, so that the resin column 3 can stably maintain an upright posture in the receiving area 43, thereby ensuring that the water in the flushing water tank 7 can flow through the entire internal area of the resin column 3, thereby increasing the accuracy of the measurement results.
[0035] Furthermore, if Figure 4 As shown, in some embodiments, the support plate 411 is a circular plate or an annular plate. The support plate 411 is a circular plate, which means that the cross-sectional profile of the support plate 411 is circular, and the support plate 411 is an annular plate, which means that the cross-sectional profile of the support plate 411 is annular. The cross section refers to the cross section of the support plate 411 along the horizontal direction, and the horizontal direction is parallel to the placement surface of the bracket 4 when working. The "cross section" described below can refer to the explanation here. Both the circular plate and the annular plate can be well adapted to the end face of the cylindrical resin column 3. Compared with the circular plate, the annular plate can reduce part of its own weight, thereby reducing the overall weight of the measuring device.
[0036] like Figure 2 and Figure 3As shown, in some embodiments, the positive conductivity measuring device for flushing water of a steam generator in a nuclear power plant further includes a flow cell 52 clamped between a limiting ring 413 and the side wall of the resin column 3, and an electrode 51 is installed in the flow cell 52. That is, the electrode 51 is indirectly arranged on the bracket 4 through the flow cell 52 clamped between the limiting ring 413 and the side wall of the resin column 3. At this time, the cross-sectional area (or outer diameter) of the limiting ring 413 can be slightly larger than the cross-sectional area (or outer diameter) of the resin column 3, so that when the resin column 3 is placed in the receiving area 43, there is still a little gap between the resin column 3 and the limiting ring 413, and the flow cell 52 can be placed in the gap, respectively abutting against the resin column 3 and the limiting ring 413, so as to be clamped between the limiting ring 413 and the side wall of the resin column 3.
[0037] like Figure 5 As shown, in other embodiments, Figures 2 to 4 The difference between the illustrated embodiment is that the limiting ring 413 includes a first limiting ring 4131 and a second limiting ring 4132, the area of the annular region enclosed by the first limiting ring 4131 is larger than the area of the annular region enclosed by the second limiting ring 4132, the first limiting ring 4131 is connected to the limiting column 412, the second limiting ring 4132 and the first limiting ring 4131 are connected by a connecting piece, the second limiting ring 4132, the support plate 411 and the limiting column 412 define a receiving area 43, and the circulation pool 52 is clamped between the second limiting ring 4132 and the first limiting ring 4131. Similarly, the electrode 51 is mounted on the circulation pool 52, that is, the electrode 51 is indirectly arranged on the bracket 4 through the circulation pool 52 clamped between the second limiting ring 4132 and the first limiting ring 4131.
[0038] like Figure 4 As shown, in some embodiments, the support portion 42 includes a plurality of support columns 421 and a base unit 422. One end of the support column 421 is connected to the limit column 412, and the other end is connected to the base unit 422. The number of the support columns 421 can be as follows: Figure 4 Four are shown, but other numbers are also possible. An acute angle is formed between each support column 421 and the limiting column 412 , and each support column 421 is disposed in a forked manner around the fixing portion 41 , thereby providing stable support for the fixing portion 41 .
[0039] Furthermore, if Figure 4As shown, in some embodiments, the base unit 422 includes a plurality of pads 423, and the pads 423 are connected to the support columns 421 in a one-to-one correspondence. That is, the number of pads 423 is consistent with the number of support columns 421, and each pad 423 is connected to each support column 421 in a one-to-one correspondence. The pads 423 and the support columns 421 can be an integrally formed one-piece structure, or a split structure, connected together by welding or the like. The pads 423 are in direct contact with the ground, and the cross-sectional area of the pads 423 is larger than the cross-sectional area of the support columns 421, thereby providing a larger contact area for stable support on the ground.
[0040] Furthermore, if Figure 4 As shown, in some embodiments, the number of the supporting columns 421 and the cushion blocks 423 are four, and one end of the four supporting columns 421 away from the limiting column 412 is respectively connected to the four cushion blocks 423. Of course, in other embodiments, the number of cushion blocks 423 and supporting columns 421 is not limited to four, and can be other numbers, as long as reliable support is provided for the fixing portion 41.
[0041] In some embodiments, the pump 1 is a peristaltic pump. The characteristic of a peristaltic pump is that the water flow is isolated in the pump tube and does not contact other components inside the peristaltic pump, so that other impurities will not be introduced into the water sample coming out of the flushing water tank 7, thereby ensuring the accuracy of the measurement result.
[0042] like Figure 2 and Figure 3 As shown, in some embodiments, the circulation pool 52 can also be connected to the drain tank 9 through a pipeline to drain excess water.
[0043] It is understandable that the above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope of the claims of the utility model.
Claims
1. A device for measuring the positive conductivity of water used for flushing steam generators in nuclear power plants, characterized in that: It comprises a pump (1), an input pipe (21), an output pipe (22), a resin column (3), a bracket (4), an electrode (51), and a conductivity meter (6); The input pipe (21) comprises a first end for connecting to a steam generator flushing water tank (7) of a nuclear power plant, and a second end connected to the pump (1); one end of the output pipe (22) is connected to the pump (1), and the other end is connected to the input end of the resin column (3); the resin column (3) is arranged on the bracket (4); the electrode (51) is arranged on the bracket (4) and is located on one side of the resin column (3); the output end of the resin column (3) is connected to the electrode (51), and the electrode (51) is connected to the conductivity meter (6).
2. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 1, characterized in that: The bracket (4) comprises a fixing portion (41) and a supporting portion (42) connected to each other, and the fixing portion (41) defines a receiving area (43) for accommodating the resin column (3).
3. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 2, characterized in that: The fixing portion (41) comprises a supporting plate (411), a plurality of limiting columns (412) and a limiting ring (413); the limiting columns (412) are connected between the supporting plate (411) and the limiting ring (413); the supporting plate (411), the limiting columns (412) and the limiting ring (413) together define the receiving area (43); and the supporting portion (42) is connected to the limiting columns (412).
4. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 3, characterized in that: The support plate (411) is a circular plate or an annular plate.
5. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 3, characterized in that: The device for measuring the positive conductivity of water for flushing a steam generator in a nuclear power plant further comprises a circulation pool (52) clamped between the limiting ring (413) and the side wall of the resin column (3), and the electrode (51) is mounted on the circulation pool (52).
6. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 3, characterized in that: The device for measuring the positive conductivity of water for flushing a steam generator in a nuclear power plant further comprises a circulation pool (52); The limiting ring (413) comprises a first limiting ring (4131) and a second limiting ring (4132); the area of the annular region enclosed by the first limiting ring (4131) is larger than the area of the annular region enclosed by the second limiting ring (4132); the first limiting ring (4131) is connected to the limiting column (412); the second limiting ring (4132) and the first limiting ring (4131) are connected via a connecting piece; the second limiting ring (4132) defines the receiving area (43) together with the supporting plate (411) and the limiting column (412); the circulation pool (52) is clamped between the second limiting ring (4132) and the first limiting ring (4131); and the electrode (51) is installed on the circulation pool (52).
7. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 3, characterized in that: The supporting portion (42) comprises a plurality of supporting columns (421) and a base unit (422); one end of the supporting column (421) is connected to the limiting column (412), and the other end is connected to the base unit (422).
8. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 7, characterized in that: The base unit (422) includes a plurality of cushion blocks (423), and the cushion blocks (423) are connected to the support columns (421) in a one-to-one correspondence.
9. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 8, characterized in that: The number of the supporting columns (421) and the cushion blocks (423) is four respectively, and the ends of the four supporting columns (421) away from the limiting columns (412) are respectively connected to the four cushion blocks (423).
10. The device for measuring the positive conductivity of water for washing steam generators in nuclear power plants according to claim 1, characterized in that: The pump machine (1) is a peristaltic pump.