Cooling working medium insulating property detection device

Abstract

The utility model relates to the technical field of insulation performance detection, particularly provides a cooling working medium insulation performance detection device, and aims to solve the problem of how to improve the detection precision of the insulation performance of a cooling working medium. In order to achieve the purpose, the cooling working medium insulation performance detection device comprises a sealed container, a detection device and a control device, wherein the interior of the sealed container is used for accommodating a to-be-detected working medium; the first electrode and the second electrode are oppositely arranged and extend into the sealed container, and an adjustable insulation distance is formed between the opposite ends of the first electrode and the second electrode; the leakage current detection assembly is located outside the sealed container, the leakage current detection assembly is connected with the first electrode, and the first electrode penetrates through the leakage current detection assembly so that the leakage current detection assembly can detect the magnitude of leakage current in the first electrode. According to the invention, the leakage current of the working medium under different loading voltages can be detected, so that the detection precision can be improved.

Description

Technical Field

[0001] This application relates to the field of insulation performance testing technology, specifically providing a device for testing the insulation performance of cooling working fluids. Background Technology

[0002] Phase change cooling technology is widely used in the cooling systems of power equipment due to its many advantages, such as high cooling efficiency, self-circulation capability, and strong insulation performance of the cooling medium. Therefore, testing the insulation performance of the phase change cooling medium is of great significance for the engineering application of phase change cooling technology.

[0003] In some related technologies, although there are methods for testing the insulation performance of the cooling medium, they can usually only detect the breakdown voltage when the cooling medium breaks down. However, at a certain voltage value, although the cooling medium is not broken down to form a conductive path, a microcurrent can still pass through it. That is, in this case, the cooling medium is not completely insulated. Therefore, the above detection methods have certain limitations and cannot accurately measure the insulation performance of the cooling medium.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] This application aims to solve the aforementioned technical problem, namely, how to improve the accuracy of testing the insulation performance of cooling working fluids.

[0006] In a first aspect, this application provides a device for testing the insulation performance of a cooling working fluid, comprising:

[0007] A sealed container, the interior of which is used to hold the working fluid to be tested;

[0008] Two opposing first and second electrodes extend into the sealed container, with an adjustable insulating distance between their opposing ends.

[0009] A leakage current detection component is located outside the sealed container and is connected to the first electrode, which passes through the leakage current detection component so that the leakage current detection component can detect the magnitude of the leakage current in the first electrode.

[0010] In one technical solution of the above-mentioned insulation performance testing device, the leakage current detection component includes:

[0011] PCB board;

[0012] A magnetic ring is embedded in the PCB board and surrounds the first electrode;

[0013] A coil winding is embedded in the PCB board and wound around the magnetic ring, so that when there is leakage current in the first electrode, an induced voltage can be generated in the coil winding.

[0014] In one technical solution of the above-mentioned insulation performance testing device, the PCB board includes a first PCB board, a second PCB board and a third PCB board stacked in sequence, the magnetic ring is embedded in the second PCB board, and the coil winding is embedded between the first PCB board, the second PCB board and the third PCB board.

[0015] In one technical solution of the above-mentioned insulation performance testing device, both the first electrode and the second electrode are connected to the sealed container via a sealing flange, and the leakage current detection component is connected to the surface of the sealing flange away from the sealed container.

[0016] In one technical solution of the above-mentioned insulation performance testing device, a heating device is provided inside the sealed container.

[0017] In one technical solution of the above-mentioned insulation performance testing device, the heating device includes a first heating device disposed in the first electrode.

[0018] In one technical solution of the above-mentioned insulation performance testing device, the heating device includes a second heating device disposed inside the sealed container. The second heating device has a ring structure and surrounds the outside of the first electrode.

[0019] In one technical solution of the above-mentioned insulation performance testing device, a pressure detection element is also provided on the sealed container, which is used to detect the pressure value inside the sealed container.

[0020] In one technical solution of the above-mentioned insulation performance testing device, the insulation performance testing device further includes:

[0021] A pressure stabilizing chamber is disposed outside the sealed container, and the pressure stabilizing chamber can contain a cooling working fluid;

[0022] A control valve is connected between the pressure stabilizing chamber and the sealed container;

[0023] The controller is communicatively connected to the pressure sensing element and the control valve, respectively. The controller controls the working state of the control valve according to the detection value of the pressure sensing element, so that the fluid in the sealed container enters the pressure stabilizing chamber or the fluid in the pressure stabilizing chamber enters the sealed container.

[0024] In one technical solution of the above-mentioned insulation performance testing device, the pressure stabilizing chamber is located above the sealed container.

[0025] By employing the above technical solution, this application, through the installation of a leakage current detection component on the electrodes, allows for the gradual increase of the applied voltage during the testing of the working fluid. The leakage current detection component can then detect the magnitude of the leakage current of the working fluid under different applied voltages, thereby improving detection accuracy. This enables the determination of whether a particular cooling working fluid meets the insulation performance requirements of power equipment in specific application scenarios, facilitating the selection of appropriate cooling working fluids based on different application scenarios to ensure the stability of power equipment operation. Attached Figure Description

[0026] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a schematic diagram of the overall structure of a cooling working fluid insulation performance testing device according to an embodiment of this application;

[0028] Figure 2 This is a top view of the internal structure of a leakage current detection component according to an embodiment of this application;

[0029] Figure 3 This is a longitudinal sectional view of a leakage current detection assembly according to an embodiment of this application.

[0030] The reference numerals in the figure are as follows:

[0031] 1. Sealed container; 11. Condensation device; 21. First electrode; 22. Second electrode; 3. Leakage current detection assembly; 31. PCB board; 311. First PCB board; 312. Second PCB board; 313. Third PCB board; 32. Magnetic ring; 33. Coil winding; 4. Sealing flange; 5. Heating device; 51. First heating device; 52. Second heating device; 6. Pressure detection element; 7. Pressure stabilizing chamber; 8. Control valve; 9. Controller. Detailed Implementation

[0032] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0033] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Testing the insulation performance of cooling media is of great significance for practical engineering applications, especially in power equipment where high insulation performance is required. For example, in the case of tiny insulation gaps in power equipment, higher requirements are placed on the insulation performance of the cooling media. Once the cooling media fills the aforementioned insulation gaps, under the influence of an electric field, it may cause phenomena such as large local leakage current or short circuits in the power equipment. Therefore, testing only the breakdown voltage of the cooling media has significant limitations.

[0036] Reference Figure 1 This is a schematic diagram of the overall structure of a cooling working fluid insulation performance testing device according to an embodiment of this application, which includes a sealed container 1, a first electrode 21, a second electrode 22, and a leakage current detection component 3.

[0037] The sealed container 1 is used to contain the working fluid to be tested. The sealed container 1 is equipped with necessary components such as a working fluid injection port, an outlet port, a seal, and a mechanical exhaust valve to ensure that a sealed space is formed inside the sealed container after the working fluid is injected. This application will not elaborate on these details. The first electrode 21 and the second electrode 22 are arranged opposite each other. One end of both the first electrode 21 and the second electrode 22 extends into the sealed container 1, while the other end is outside the sealed container 1. An adjustable insulation distance is reserved between the opposite ends of the first electrode 21 and the second electrode 22 to allow the working fluid to be tested to fill this insulation distance. In some embodiments, electrode plates can be fixedly installed at the opposite ends of both the first electrode 21 and the second electrode 22, or one of the first electrode 21 and the second electrode 22 can have an electrode plate fixedly installed at its end, while the other end is a pointed tip, etc. This application does not impose any limitations on this, as long as it facilitates the formation of a stable electric field within the aforementioned insulation distance to benefit the detection of the working fluid.

[0038] In actual testing, the second electrode 22 serves as the positive electrode, and the first electrode 21 serves as the negative electrode. A voltage is applied to the second electrode 22, and the first electrode 21 is grounded, thereby creating an electric field within the sealed container 1. Ideally, assuming the working fluid under test is absolutely insulated, no current should flow through the first electrode 21 and the second electrode 22 as the applied voltage increases. However, the working fluid under test is not actually absolutely insulated. Therefore, as the voltage increases, a micro-current will gradually be generated in the first electrode 21 and the second electrode 22. For ease of description, this application refers to this micro-current as leakage current. It can be understood that the higher the voltage, the greater the value of the leakage current will gradually increase.

[0039] The leakage current detection component 3 is located outside the sealed container 1. The leakage current detection component 3 is connected to the first electrode 21, and the first electrode 21 passes through the leakage current detection component 3, so that the leakage current detection component 3 can detect the specific value of the leakage current.

[0040] Reference Figure 2 and Figure 3 The leakage current detection component 3 includes a PCB board 31, a magnetic ring 32, and a coil winding 33. For ease of manufacturing, the PCB board 31 comprises a first PCB board 311, a second PCB board 312, and a third PCB board 313 stacked sequentially. The magnetic ring 32 is embedded within the second PCB board 312, forming an integral structure. The coil winding 33 is embedded between the first PCB board 311, the second PCB board 312, and the third PCB board 313. Specifically, the coil winding 33 includes a first conductor layer embedded in the first PCB board 311, a second conductor layer embedded in the third PCB board 313, and a third conductor layer connecting the first and second conductor layers. The third conductor layer is connected to the first and second conductor layers via vias on the PCB board, thereby allowing the coil winding 33 formed by the first, second, and third conductor layers to wind around the outside of the magnetic ring 32.

[0041] The first PCB board 311, the second PCB board 312, and the third PCB board 313 have through holes at their centers. The first electrode 21 passes through these through holes, causing the magnetic ring 32 to surround the first electrode 21. When leakage current flows through the first electrode 21, an induced voltage is generated in the coil winding 33, thereby detecting the leakage current. It should be noted that the coil winding 33 can be arranged around the circumference of the magnetic ring 32, or it can be arranged only in a certain section of the magnetic ring 32; this application does not impose any restrictions on this.

[0042] As described above, this application, by setting a leakage current detection component 3 on the first electrode 21, allows for the gradual increase of the applied voltage during the detection of the working fluid under test. The leakage current detection component 3 can detect the magnitude of the leakage current of the working fluid under different applied voltages, thereby improving the detection accuracy. This enables the determination of whether a certain cooling working fluid meets the insulation performance requirements of the power equipment in a specific application scenario, facilitating the selection of appropriate cooling working fluids based on different application scenarios to ensure the stability of power equipment operation.

[0043] Reference Figure 1 The first electrode 21 and the second electrode 22 are both connected to the sealed container 1 via sealing flanges 4, which fix the first electrode 21 and the second electrode 22 to the sealed container 1 while ensuring the airtightness between the first electrode 21 and the second electrode 22 and the sealed container 1. The leakage current detection component 3 is fixedly connected to the surface of the sealing flange 4 away from the sealed container 1, thereby integrating the leakage current detection component 3 and the sealed container 1 into a single structure, which helps to improve the overall integrity and integration of the device.

[0044] Reference Figure 1 In one embodiment of this application, a heating device 5 is further provided inside the sealed container 1. By controlling the heating power of the heating device 5, the working fluid to be tested inside the sealed container 1 can be in different states such as gas phase, liquid phase, or gas-liquid two-phase, thereby allowing for separate detection of different states of the working fluid to be tested. Optionally, the heating device 5 includes a first heating device 51 and a second heating device 52. The first heating device 51 is disposed in the first electrode 21 and integrated with the first electrode 21 into a single structure. The second heating device 52 is configured as a ring structure, surrounding the outside of the first electrode 21. In this way, the second heating device 52 can heat various positions inside the sealed container 1, making the temperature of the working fluid inside the sealed container 1 more uniform, which is beneficial to the transformation between different phases of the working fluid to be tested.

[0045] Reference Figure 1 As one implementation of this application, the sealed container 1 is also provided with a pressure detection element 6, which is used to detect the pressure value inside the sealed container 1.

[0046] A pressure-stabilizing chamber 7 is also provided outside the sealed container 1. The pressure-stabilizing chamber 7 is connected to the sealed container 1 via a pipeline, and a control valve 8 is also connected in the pipeline between the pressure-stabilizing chamber 7 and the sealed container 1. The control valve 8 is used to control the opening and closing of the pipeline, thereby connecting or isolating the sealed container 1 and the pressure-stabilizing chamber 7. The cooling medium insulation performance testing device of this application also includes a controller 9, which is communicatively connected to the pressure detection element 6, the pressure-stabilizing chamber 7 and the control valve 8.

[0047] It should be noted that when testing the insulation performance of gaseous or gas-liquid two-phase working fluids, the pressure value inside the sealed container 1 will affect the test results. For example, when measuring the breakdown voltage of the working fluid, the test value is very sensitive to pressure, and the detection of leakage current is also affected by pressure. Therefore, controlling the pressure value inside the sealed container 1 within the target range is very important for the test results.

[0048] This application employs the above-described scheme, allowing for the setting of pressure within the pressure stabilizing chamber 7 and the sealed container 1 before testing. Specifically, control valve 8 is opened to connect the pressure stabilizing chamber 7 and the sealed container 1. Secondary cooling water in the second heating device 52 and the condensing device 11 is activated, and non-condensable gases in the devices are expelled using a mechanical exhaust valve. This allows the pressure stabilizing chamber 7 to contain a gaseous cooling medium (or a mixture of gaseous cooling medium and a small amount of non-condensable gases). The pressure values ​​within the pressure stabilizing chamber 7 and the sealed container 1 are adjusted so that the pressure value of the connected space formed by the pressure stabilizing chamber 7 and the sealed container 1 is within a set pressure range or a fixed set value. This set pressure range or set value must be within the target range for testing the insulation performance of the medium under test. After the pressure value adjustment is completed, control valve 8 is closed. The aforementioned target range refers to the allowable pressure range for testing the medium under test. Within the target range, the test results for breakdown voltage / leakage current are essentially unaffected. Therefore, the target range has two endpoints: an upper pressure limit and a lower pressure limit. The specific target range can be determined based on actual experiments or experience; this application does not impose any limitations on it.

[0049] During actual testing, control valve 8 is normally closed. The pressure value inside the sealed container 1 is detected by pressure sensing element 6. When the pressure value inside the sealed container 1 exceeds the upper pressure limit, pressure sensing element 6 sends a pressure signal back to controller 9. Controller 9 then controls control valve 8 to open, allowing the gaseous working medium inside the sealed container 1 to enter the pressure stabilizing chamber 7. Control valve 8 closes only after the pressure value inside the sealed container 1 falls below the upper pressure limit for a first preset time. Conversely, when the pressure value inside the sealed container 1 falls below the lower pressure limit, pressure sensing element 6 sends a pressure signal back to controller 9. Controller 9 then controls control valve 8 to open, allowing the gaseous working medium in the pressure stabilizing chamber 7 to enter the sealed container 1. Control valve 8 closes only after the pressure value inside the sealed container 1 exceeds the lower pressure limit for a second preset time. This not only regulates the pressure inside the sealed container 1 but also reduces pressure fluctuations during testing, maintaining the pressure within a relatively constant range, thereby improving the reliability and accuracy of the test results.

[0050] It should be understood that the aforementioned first preset duration and second preset duration can be the same value or different values, and the specific values ​​of the first preset duration and second preset duration can be determined according to actual needs, such as 10 seconds, 20 seconds, etc., which are not limited in this application. It should be noted that continuing the first preset duration and second preset duration after the pressure value inside the sealed container 1 drops below the upper pressure limit or increases above the lower pressure limit is to stabilize the pressure value inside the sealed container 1 at a relatively constant value and reduce the impact of instantaneous pressure fluctuations.

[0051] It should be noted that, referring to Figure 1 A condenser 11 is provided on the sealed container 1. The condenser 11 can be located on the outer surface of the sealed container 1 or inside the sealed container 1. For example, this application uses a cooling coil located inside the sealed container 1 as an example for illustrative purposes, but this application does not limit its specific form. In practical applications, the phase transformation of the working fluid and the regulation of the gas pressure inside the sealed container 1 are achieved through the joint cooperation of the heating device 5 and the condenser 11 (that is, when it is necessary to convert the working fluid into a gaseous state to increase the pressure inside the sealed container 1, the heating power of the heating device 5 is increased, while the cooling water flow rate inside the condenser 11 is reduced; when it is necessary to reduce the pressure inside the sealed container 1, the heating power of the heating device 5 is reduced, while the cooling water flow rate inside the condenser 11 is increased, thereby converting the gaseous working fluid into a liquid state).

[0052] Optionally, the pressure stabilizing chamber 7 is positioned above the sealed container 1. Since the gaseous working fluid will settle at the bottom of the pressure stabilizing chamber 7 due to gravity, positioning it above the sealed container 1 allows the working fluid in the pressure stabilizing chamber 7 to be directly connected to the sealed container 1 after the control valve 8 is opened, which is beneficial for gas exchange.

[0053] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A device for testing the insulation performance of a cooling working fluid, characterized in that, include: A sealed container (1) is used to contain the working fluid to be tested; Two opposing first electrodes (21) and second electrodes (22) extend into the sealed container (1), and there is an adjustable insulating distance between the opposing ends of the first electrode (21) and the second electrode (22). A leakage current detection component (3) is located outside the sealed container (1) and is connected to the first electrode (21), which passes through the leakage current detection component (3) so that the leakage current detection component (3) can detect the magnitude of the leakage current in the first electrode (21).

2. The insulation performance testing device according to claim 1, characterized in that, The leakage current detection component (3) includes: PCB board (31); A magnetic ring (32) is embedded in the PCB board (31) and the magnetic ring (32) is arranged around the first electrode (21); A coil winding (33) is embedded in the PCB board (31) and the coil winding (33) is wound around the magnetic ring (32), so that when there is leakage current in the first electrode (21), an induced voltage can be generated in the coil winding (33).

3. The insulation performance testing device according to claim 2, characterized in that, The PCB board (31) includes a first PCB board (311), a second PCB board (312) and a third PCB board (313) stacked in sequence. The magnetic ring (32) is embedded in the second PCB board (312) and the coil winding (33) is embedded between the first PCB board (311), the second PCB board (312) and the third PCB board (313).

4. The insulation performance testing device according to claim 2, characterized in that, The first electrode (21) and the second electrode (22) are both connected to the sealed container (1) via a sealing flange (4), and the leakage current detection assembly (3) is connected to the surface of the sealing flange (4) away from the sealed container (1).

5. The insulation performance testing device according to claim 1, characterized in that, A heating device (5) is installed inside the sealed container (1).

6. The insulation performance testing device according to claim 5, characterized in that, The heating device (5) includes a first heating device (51) disposed in the first electrode (21).

7. The insulation performance testing device according to claim 5, characterized in that, The heating device includes a second heating device (52) disposed inside the sealed container (1), the second heating device (52) having an annular structure and surrounding the outside of the first electrode (21).

8. The insulation performance testing device according to any one of claims 1 to 7, characterized in that, The sealed container (1) is also provided with a pressure detection element (6), which is used to detect the pressure value inside the sealed container (1).

9. The insulation performance testing device according to claim 8, characterized in that, The insulation performance testing device also includes: A pressure stabilizing chamber (7) is disposed outside the sealed container (1), and the pressure stabilizing chamber (7) can contain a cooling working fluid; A control valve (8) is connected between the pressure stabilizing chamber (7) and the sealed container (1); The controller (9) is communicatively connected to the pressure detection element (6) and the control valve (8) respectively. The controller (9) controls the working state of the control valve (8) according to the detection value of the pressure detection element (6) so that the fluid in the sealed container (1) enters the pressure stabilizing chamber (7) or the fluid in the pressure stabilizing chamber (7) enters the sealed container (1).

10. The insulation performance testing device according to claim 9, characterized in that, The pressure stabilizing chamber (7) is located above the sealed container (1).

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