Device and method for detecting leakage of mechanical seal assembly

Abstract

The present application provides a device and method for detecting leakage of a mechanical seal assembly, the device comprising a desalted water tank, a water pump inlet valve, a water pump, a pressure relief valve, a water pump outlet valve, a filter, a pressure regulating valve, a first pressure gauge, a second pressure gauge, a steam trap, a water supply pipeline, a mechanical seal assembly test chamber, a chamber support rod, an oil-water collection measuring cup, a transmission chain, a high- and low-pressure collection measuring cup, a reducer, and a motor. The outlet of the leakage pipeline connected to the oil leakage collection port and the oil-water leakage collection port is located above the oil-water collection measuring cup, and the outlet of the leakage pipeline connected to the low-pressure leakage collection port and the high-pressure leakage collection port is located above the high- and low-pressure collection measuring cup. Two liquid level probes are respectively placed in the oil-water collection measuring cup and the high- and low-pressure collection measuring cup to monitor the leakage rate using the two liquid level probes. The present application solves the current problem of how to measure the leakage of a mechanical seal assembly by connecting a leakage pipeline and a corresponding measuring cup at the mechanical seal.

Description

Technical Field

[0001] The present application belongs to the technical field of mechanical seal components, and specifically relates to a device and method for detecting leakage of a mechanical seal component. Background Art

[0002] The refueling equipment of a heavy water reactor nuclear power plant has a key equipment sealing component. After maintenance, mechanical seal leakage measurement is required to verify the leakage rate to ensure that the requirements are met, otherwise a large amount of heavy water will be lost and the environment will be polluted. Therefore, how to detect the leakage of mechanical seal components has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, the embodiments of the present application are directed to providing a device and method for detecting leakage of a mechanical seal assembly, which solves the problem of how to detect leakage of a mechanical seal assembly in the prior art by connecting a leakage pipeline and a corresponding measuring cup at the mechanical seal.

[0004] The first aspect of the present application provides a device for detecting leakage of a mechanical seal assembly, comprising a desalted water tank, a water pump inlet valve, a water pump, a pressure relief valve, a water pump outlet valve, a filter, a pressure regulating valve, a first pressure gauge, a second pressure gauge, a steam trap, a water supply line, a mechanical seal assembly test chamber, a chamber support rod, an oil-water collection measuring cup, a transmission chain, a high and low pressure collection measuring cup, a reducer and a motor. One end of the water pump inlet valve is connected to the desalted water tank with a stainless steel pipeline, and the other end of the water pump inlet valve is connected to the water pump inlet. The pressure relief valve is connected to the water pump outlet. The other end of the pressure relief valve is connected to the water pump outlet valve and the second pressure gauge. The other end of the water pump outlet valve is connected to the filter, and the other end of the filter is connected to the pressure regulating valve. The other end of the pressure regulating valve is connected to the first pressure gauge. The other end of the first pressure gauge is connected to the steam trap with a stainless steel pipeline, and the water supply line is connected to the mechanical seal assembly test chamber. The mechanical seal assembly test chamber is used to install the first mechanical seal assembly and the second mechanical seal assembly after maintenance. The first mechanical seal assembly is provided with an oil leakage collection port, an oil-water leakage collection port, a low-pressure leakage collection port, and a high-pressure leakage collection port. The outlet of the leakage pipeline connected to the oil leakage collection port and the oil-water leakage collection port is located above the oil-water collection measuring cup, and the outlet of the leakage pipeline connected to the low-pressure leakage collection port and the high-pressure leakage collection port is located above the high-low pressure collection measuring cup. Two liquid level probes are respectively placed in the oil-water collection measuring cup and the high-low pressure collection measuring cup to monitor the leakage rate using the two liquid level probes.

[0005] In a specific embodiment of the present application, the device for detecting leakage of the mechanical seal assembly further comprises a control panel which is connected to two liquid level probes and is used to receive signals from the liquid level probes and determine whether the leakage rates of the first mechanical seal assembly and the second mechanical seal assembly meet the requirements.

[0006] In a specific embodiment of the present application, a control panel has a built-in timer, and the control panel is used to control the start and stop of a device for detecting leakage of a mechanical seal assembly at a first preset time period set by the timer.

[0007] In a specific embodiment of the present application, the device for detecting leakage of the mechanical seal assembly further includes one or more of a support rod, a motor support member, and a control panel support member. The mechanical seal assembly test chamber is supported by a chamber support rod. The motor support member is located below the motor and is used to support the motor. The control panel support member is located below the control panel and is used to support the control panel.

[0008] The second aspect of the present application provides a method for detecting leakage of a mechanical seal assembly, comprising: installing the first mechanical seal assembly and the second mechanical seal assembly after repair on the mechanical seal assembly test chamber in any mechanical seal assembly leakage detection device provided in the first aspect of the present application; opening the water pump inlet valve and starting the water pump; after confirming that the pressure value of the second pressure gauge meets the first preset pressure value, opening the water pump outlet valve; after confirming that the water pump has been started for a second preset time, adjusting the pressure regulating valve so that the first pressure gauge displays the second preset pressure value; at the second preset pressure value, connecting the second mechanical seal assembly and the reducer with a transmission chain; and monitoring the leakage rate through any one or more of the two liquid level probes placed in the oil-water collection cup and the high and low pressure collection cups.

[0009] In a specific embodiment of the present application, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collection cup and the high- and low-pressure collection cup, including: if the second preset pressure value is 1Mpa, the leakage rate at the low-pressure leakage collection port is monitored by the high- and low-pressure collection cup to see if it exceeds the preset standard value; if the high- and low-pressure collection cup monitors that the leakage rate at the low-pressure leakage collection port exceeds the preset standard value, the liquid level probe placed in the high- and low-pressure collection cup sends the resistance signal to the control panel for alarm display, and the control panel issues a command to stop the motor.

[0010] In a specific embodiment of the present application, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collecting measuring cup and the high-low pressure collecting measuring cup, including: if the second preset pressure value is 3.45Mpa, the leakage rate at the oil leakage collection port is monitored by the oil-water collecting measuring cup to see if it exceeds the preset standard value; if the oil-water collecting measuring cup monitors that the leakage rate at the oil leakage collection port exceeds the preset standard value, the liquid level probe placed in the oil-water collecting measuring cup sends a resistance signal to the control panel for alarm display, and the control panel issues a command to stop the motor.

[0011] In a specific embodiment of the present application, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collecting measuring cup and the high-low pressure collecting measuring cup, including: if the second preset pressure value is 11.2Mpa, then the leakage rate at the high-pressure leakage collecting port is monitored by the high-low pressure collecting measuring cup to see if it exceeds the preset standard value, and the leakage rate at the oil-water leakage collecting port is monitored by the oil-water collecting measuring cup to see if it exceeds the preset standard value; if the high-low pressure collecting measuring cup detects that the leakage rate at the high-pressure leakage collecting port exceeds the preset standard value, the liquid level probe placed in the high-low pressure collecting measuring cup sends a resistance signal to the control panel for alarm display, and the control panel issues a command to stop the motor; if the oil-water collecting measuring cup detects that the leakage rate at the oil-water leakage collecting port exceeds the preset standard value, the liquid level probe placed in the oil-water collecting measuring cup sends a resistance signal to the control panel for alarm display, and the control panel issues a command to stop the motor.

[0012] In a specific embodiment of the present application, the method for detecting leakage of a mechanical seal assembly further includes: after stopping the motor, tightening the first mechanical seal assembly and the second mechanical seal assembly with a torque wrench.

[0013] In a specific embodiment of the present application, after monitoring the leakage rate through any one or more of the two liquid level probes placed in the oil-water collection cup and the high and low pressure collection cup, it also includes: after all tests are completed, stopping the water pump, opening the drain valve, draining all the desalted water from the pipeline and the mechanical seal test chamber, and removing the first mechanical seal assembly and the second mechanical seal assembly.

[0014] The beneficial effect of the technical solution of the present application is that: by using the mechanical seal assembly test chamber in the device for detecting leakage of the mechanical seal assembly to install the first mechanical seal assembly and the second mechanical seal assembly after the maintenance is completed, the desalted water in the desalted water tank can enter the mechanical seal assembly test chamber through the water pump inlet valve, the water pump, the pressure release valve and other components, and then the first mechanical seal assembly and the second mechanical seal assembly are driven forward and backward through the transmission chain, the reducer and the motor, and the leakage rate in the oil-water collection cup and the high and low pressure collection cup is respectively monitored by two liquid level probes. The device for detecting leakage of the mechanical seal assembly provided in the embodiment of the present application connects the leakage pipeline and the corresponding measuring cup at the mechanical seal, and uses the liquid level probe to monitor whether the leakage rate meets the corresponding requirements, thereby realizing the leakage monitoring of the mechanical seal assembly, ensuring that the leakage rate of the first mechanical seal assembly and the second mechanical seal assembly after the maintenance meets the requirements, thereby avoiding the loss of heavy water, causing environmental pollution and major economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of a device for detecting leakage of a mechanical seal assembly provided in one embodiment of the present application.

[0016] Figure 1 In: 1- desalted water tank, 2- water pump inlet valve, 3- water pump, 4- pressure release valve, 5- water pump outlet valve, 6- filter, 7- pressure regulating valve, 8- first pressure gauge, 9- second pressure gauge, 10- steam trap, 11- water supply pipeline, 12- mechanical seal assembly test chamber, 13- chamber support rod, 14- first mechanical seal assembly, 15- oil and water collection cup, 16- second mechanical seal assembly, 17- transmission chain, 18- high and low pressure collection cup, 19- reducer, 20- motor, 21- control panel, 22- motor support, 23- control panel support, a- oil leakage collection port, b- oil and water leakage collection port, c- low pressure leakage collection port, d- high pressure leakage collection port. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] At least one embodiment of the present application provides a device for detecting leakage of a mechanical seal assembly, referring to Figure 1The device for detecting leakage of the mechanical seal assembly comprises a desalted water tank 1, a water pump inlet valve 2, a water pump 3, a pressure relief valve 4, a water pump outlet valve 5, a filter 6, a pressure regulating valve 7, a first pressure gauge 8, a second pressure gauge 9, a steam trap 10, a water supply pipeline 11, a mechanical seal assembly test chamber 12, an oil-water collection measuring cup 15, a transmission chain 17, a high and low pressure collection measuring cup 18, a reducer 19 and a motor 20. One end of the water pump inlet valve 2 is connected to the desalted water tank 1 by a stainless steel pipeline, and the other end of the water pump inlet valve 2 is connected to the inlet of the water pump 3. The outlet of the water pump 3 is connected to the pressure relief valve 4. The other end of the pressure relief valve 4 is connected to the water pump outlet valve 5 and the second pressure gauge 9. The other end of the water pump outlet valve 5 is connected to the filter 6, and the other end of the filter 6 is connected to the pressure regulating valve 7. The other end of the pressure regulating valve 7 is connected to the first pressure gauge 8. The other end of the first pressure gauge 8 is connected to the steam trap 10 by a stainless steel pipeline, and the water supply pipeline 11 is connected to the mechanical seal assembly test chamber 12. The mechanical seal assembly test chamber 12 is used to install the first mechanical seal assembly 14 and the second mechanical seal assembly 16 after the repair is completed. The first mechanical seal assembly 14 is provided with an oil leakage collection port a, an oil-water leakage collection port b, a low-pressure leakage collection port c and a high-pressure leakage collection port d. The outlet of the leakage pipeline connected to the oil leakage collection port a and the oil-water leakage collection port b is located above the oil-water collection measuring cup 15, and the outlet of the leakage pipeline connected to the low-pressure leakage collection port c and the high-pressure leakage collection port d is located above the high-low pressure collection measuring cup 18. Two liquid level probes are respectively placed in the oil-water collection measuring cup 15 and the high-low pressure collection measuring cup 18 to monitor the leakage rate using the two liquid level probes.

[0019] It should be noted that if the pressure in the mechanical seal assembly test chamber 12 suddenly rises and causes overpressure, the pressure can be released through the pressure relief valve. The liquid level probe can convert the resistance signal into a current signal, and start and stop and alarm through analog-to-digital conversion. The first mechanical seal assembly 14 and the second mechanical seal assembly 16 can be components corresponding to the mechanical seal of key equipment in the loading and unloading system of a heavy water reactor nuclear power plant.

[0020] If the leakage rate monitored by the liquid level probe does not meet the corresponding requirements, it can be repaired until the requirements are met, and then the desalted water of the mechanical seal assemblies such as the first mechanical seal assembly 14 and the second mechanical seal assembly 16 can be discharged through the steam trap 10.

[0021] According to the technical solution provided in the embodiment of the present application, by utilizing the first mechanical seal assembly 14 and the second mechanical seal assembly 16 after the installation and maintenance of the mechanical seal assembly test chamber 12 in the device for detecting leakage of the mechanical seal assembly, the desalted water in the desalted water tank 1 can enter the mechanical seal assembly test chamber 12 through the water pump inlet valve 2, the water pump 3, the pressure release valve 4 and other components, so that the water pump 3 is used to start the mechanical seal assembly test chamber 12 to pressurize, and then the first mechanical seal assembly 14 and the second mechanical seal assembly 16 are driven forward and backward through the transmission chain 17, the reducer 19 and the motor 20, and the leakage rates in the oil-water collection measuring cup 15 and the high and low pressure collection measuring cups 18 are monitored respectively by two liquid level probes, thereby realizing the integration of pressure and drive, and also realizing leakage monitoring under corresponding pressure. The device for detecting leakage of mechanical seal components provided in the embodiment of the present application realizes the functions of oil-water mixing and oil-water monomer collection by setting oil leakage collection port a, oil-water leakage collection port b, low-pressure leakage collection port c and high-pressure leakage collection port d and corresponding measuring cups, and uses a liquid level probe to monitor whether the leakage rate meets the corresponding requirements, thereby realizing leakage monitoring of the mechanical seal components, ensuring that the leakage rates of the first mechanical seal component 14 and the second mechanical seal component 16 after the maintenance are completed meet the requirements, thereby avoiding the loss of heavy water, environmental pollution and major economic losses. In addition, the device for detecting leakage of mechanical seal components is simple to operate, has a reasonable structure and is highly practical.

[0022] In at least one embodiment of the present application, the device for detecting leakage of the mechanical seal assembly further includes a control panel 21. The control panel 21 is connected to the two liquid level probes, and the control panel 21 is used to receive signals from the liquid level probes and determine whether the leakage rates of the first mechanical seal assembly 14 and the second mechanical seal assembly 16 meet the requirements. In this way, the automatic monitoring of the leakage rate of the mechanical seal assembly is achieved by using the control panel 21, which is conducive to timely detection of excessive leakage rate and alarm processing.

[0023] In at least one embodiment of the present application, the control panel 21 has a built-in timer, and the control panel 21 is used to control the start and stop of the device for detecting leakage of the mechanical seal component under the first preset time length set by the timer. In this way, by using the timer to control the start and stop of the water pump and the motor, etc., the automation of the device for detecting leakage of the mechanical seal component under different pressures is further improved.

[0024] For example, the first preset duration is 5 minutes.

[0025] In at least one embodiment of the present application, the filtering accuracy of the filter 6 is 10 µm.

[0026] In at least one embodiment of the present application, the device for detecting leakage of the mechanical seal assembly further includes one or more of a chamber support rod 13, a motor support member 22, and a control panel support member 23. The mechanical seal assembly test chamber 12 is supported by the chamber support rod 13. The motor support member 22 is located below the motor 20 and is used to support the motor 20. The control panel support member 23 is located below the control panel 21 and is used to support the control panel 21.

[0027] At least one embodiment of the present application provides a method for detecting leakage of a mechanical seal assembly. The method for detecting leakage of a mechanical seal assembly includes the following steps.

[0028] S1: Install the first mechanical seal assembly 14 and the second mechanical seal assembly 16 after repair on the mechanical seal assembly test chamber 12 in a mechanical seal assembly leakage detection device provided in any embodiment of the present application.

[0029] S2: Open the water pump inlet valve 2 and start the water pump 3.

[0030] S3: After confirming that the pressure value of the second pressure gauge 9 meets the first preset pressure value, open the water pump outlet valve 5.

[0031] In some embodiments, the pressure setting point of the pressure relief valve 4 is 11.6 Mpa. The first preset pressure value is 11.6 Mpa.

[0032] In at least one embodiment of the present application, S21 is included before S3.

[0033] S21: If the filter 6 is clogged, replace the filter element of the filter 6 and the desalted water in the desalted water tank 1.

[0034] If the desalted water quality is poor and causes the filter 6 to be clogged, the filter 6 may sound an alarm, the pressure setting of the pressure relief valve 4 cannot be completed, and the pressure value of the second pressure gauge 9 in the above S3 may not meet the first preset pressure value. At this time, the filter element of the filter 6 and the desalted water in the desalted water tank 1 can be replaced.

[0035] S4: After confirming that the water pump 3 has been started for the second preset time, the pressure regulating valve 7 is adjusted so that the first pressure gauge 8 displays a second preset pressure value.

[0036] In some embodiments, the second preset pressure value is 1 MPa, 3.45 MPa and 11.2 MPa. The second preset time length is 10 minutes.

[0037] S5: Under a second preset pressure value, the second mechanical seal assembly 16 and the reducer 19 are connected by the transmission chain 17 .

[0038] S6: Monitor the leakage rate through any one or more of the two liquid level probes placed in the oil-water collection measuring cup 15 and the high-low pressure collection measuring cup 18.

[0039] In some embodiments, after S5, the method for detecting leakage of a mechanical seal assembly further includes S51. Accordingly, the above S6 may be performed at a first preset time length.

[0040] S51: Receive a first preset duration set by a timer.

[0041] In at least one embodiment of the present application, S61 and S62 are a specific implementation of the above S6.

[0042] S61: If the second preset pressure value is 1 MPa, the leakage rate at the low pressure leakage collection port c is monitored by the high and low pressure collection measuring cup 18 to see if it exceeds the preset standard value.

[0043] S62: If the high and low pressure collection cup 18 detects that the leakage rate at the low pressure leakage collection port c exceeds the preset standard value, the liquid level probe placed in the high and low pressure collection cup 18 sends the resistance signal to the control panel 21 for alarm display, and the control panel 21 issues a command to stop the motor 20.

[0044] In at least one embodiment of the present application, S63 and S64 are a specific implementation of the above-mentioned S6.

[0045] S63: If the second preset pressure value is 3.45 MPa, the leakage rate at the oil leakage collection port a is monitored by the oil-water collection measuring cup 15 to see whether it exceeds the preset standard value.

[0046] S64: If the oil-water collecting measuring cup 15 detects that the leakage rate at the oil leakage collecting port a exceeds the preset standard value, the liquid level probe placed in the oil-water collecting measuring cup 15 sends a resistance signal to the control panel 21 for alarm display, and the control panel 21 issues a command to stop the motor 20.

[0047] In at least one embodiment of the present application, S65 and S66 are a specific implementation of the above-mentioned S6.

[0048] S65: If the second preset pressure value is 11.2 MPa, the leakage rate at the high pressure leakage collection port d is monitored by the high and low pressure collection measuring cup 18 to see if it exceeds the preset standard value, and the leakage rate at the oil and water leakage collection port b is monitored by the oil and water collection measuring cup 15 to see if it exceeds the preset standard value.

[0049] S66: If the high and low pressure collection cup 18 detects that the leakage rate at the high pressure leakage collection port d exceeds the preset standard value, the liquid level probe placed in the high and low pressure collection cup 18 sends the resistance signal to the control panel 21 for alarm display, and the control panel 21 issues a command to stop the motor 20.

[0050] S67: If the oil-water collecting measuring cup 15 detects that the leakage rate at the oil-water leakage collecting port b exceeds the preset standard value, the liquid level probe placed in the oil-water collecting measuring cup 15 sends a resistance signal to the control panel 21 for alarm display, and the control panel 21 issues a command to stop the motor 20.

[0051] In at least one embodiment of the present application, the preset standard value is 50 mL / min.

[0052] It should be noted that the device for detecting leakage of the mechanical seal assembly can perform leakage monitoring under three working conditions, namely, low pressure value, medium pressure value and high pressure value, in sequence. For example, the above steps S61 to S67 are executed in sequence from 1Mpa (corresponding to low pressure value), 3.45Mpa (corresponding to medium pressure value), and 11.2Mpa (corresponding to high pressure value), thereby realizing leakage collection and alarm under different working conditions of high, medium and low pressure.

[0053] In at least one embodiment of the present application, after the above S6, the method for detecting leakage of a mechanical seal assembly further includes S7.

[0054] S7: After stopping the motor 20, tighten the first mechanical seal assembly 14 and the second mechanical seal assembly 16 with a torque wrench.

[0055] It should be noted that, under different second preset pressure values, the above steps S6 and S7 can be repeatedly executed, and can be executed in sequence from low to high pressure values ​​under different second preset pressure values.

[0056] In some embodiments, the torque used to tighten the first mechanical seal assembly 14 and the second mechanical seal assembly 16 using a torque wrench does not exceed 1.7 Nm.

[0057] In at least one embodiment of the present application, after the above S6, the method for detecting leakage of a mechanical seal assembly further includes S8.

[0058] S8: After all tests are completed, the water pump 3 is stopped, the steam trap 10 is opened, the deionized water in the pipeline and the mechanical seal test chamber 12 is completely drained, and the first mechanical seal assembly 14 and the second mechanical seal assembly 16 are removed.

[0059] In some embodiments, after all tests are completed, the control panel can be used to automatically control the water pump 3 to stop and the drain valve 10 to open, so that automatic draining can be achieved after the test is completed.

[0060] The method for detecting leakage of a mechanical seal assembly is implemented by using a device for detecting leakage of a mechanical seal assembly provided in any of the above embodiments of the present application, includes corresponding technical features, and can achieve corresponding technical effects, which will not be described in detail here.

[0061] The device and method for detecting leakage of a mechanical seal assembly provided in any of the above embodiments of the present application are easy to understand and highly practical, ensuring that the heavy water leakage rate of the mechanical seal chamber meets the corresponding requirements after the seal is repaired, and can be promoted and applied to similar power stations.

[0062] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0063] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprises" and "includes" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0064] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for detecting leakage of a mechanical seal assembly, characterized in that: It includes a desalted water tank, a water pump inlet valve, a water pump, a pressure relief valve, a water pump outlet valve, a filter, a pressure regulating valve, a first pressure gauge, a second pressure gauge, a steam trap, a water supply pipeline, a mechanical seal component test chamber, a chamber support rod, an oil and water collection cup, a transmission chain, a high and low pressure collection cup, a reducer and a motor. One end of the water pump inlet valve is connected to the desalted water tank by a stainless steel pipeline, the other end of the water pump inlet valve is connected to the water pump inlet, the water pump outlet is connected to the pressure relief valve, the other end of the pressure relief valve is connected to the water pump outlet valve and the second pressure gauge, the other end of the water pump outlet valve is connected to the filter, the other end of the filter is connected to the pressure regulating valve, the other end of the pressure regulating valve is connected to the first pressure gauge, the other end of the first pressure gauge is connected to the steam trap by a stainless steel pipeline, the water supply pipeline is connected to the mechanical seal assembly test chamber, the mechanical seal The component test chamber is used to install the first mechanical seal component and the second mechanical seal component after maintenance. The first mechanical seal component is provided with an oil leakage collection port, an oil-water leakage collection port, a low-pressure leakage collection port and a high-pressure leakage collection port. The outlet of the leakage pipeline connected to the oil leakage collection port and the oil-water leakage collection port is located above the oil-water collection measuring cup, and the outlet of the leakage pipeline connected to the low-pressure leakage collection port and the high-pressure leakage collection port is located above the high-low pressure collection measuring cup. Two liquid level probes are respectively placed in the oil-water collection measuring cup and the high-low pressure collection measuring cup to monitor the leakage rate using the two liquid level probes. The first mechanical seal assembly and the second mechanical seal assembly are components corresponding to the mechanical seals of key equipment in the loading and unloading system of a heavy water reactor nuclear power plant. During detection, the first mechanical seal assembly and the second mechanical seal assembly are tightly connected.

2. The device for detecting leakage of a mechanical seal assembly according to claim 1, characterized in that: Also includes control panel, The control panel is connected to the two liquid level probes, and is used to receive signals from the liquid level probes and determine whether the leakage rates of the first mechanical seal assembly and the second mechanical seal assembly meet requirements.

3. The device for detecting leakage of a mechanical seal assembly according to claim 2, characterized in that: The control panel has a built-in timer, and the control panel is used to control the start and stop of the mechanical seal component leakage detection device under the first preset time length set by the timer.

4. The device for detecting leakage of a mechanical seal assembly according to claim 2 or 3, characterized in that: Also includes one or more of a chamber support rod, a motor support, and a control disk support, The mechanical seal assembly test chamber is supported by the chamber support rod; the motor support is located below the motor and is used to support the motor; the control panel support is located below the control panel and is used to support the control panel.

5. A method for detecting leakage of a mechanical seal assembly, characterized in that: Using the device for detecting leakage of a mechanical seal assembly according to claim 1, a method for detecting leakage of a mechanical seal assembly comprises: Installing the first mechanical seal assembly and the second mechanical seal assembly after repair on a mechanical seal assembly test chamber in a mechanical seal assembly leakage detection device; Open the water pump inlet valve and start the water pump; After confirming that the pressure value of the second pressure gauge meets the first preset pressure value, open the water pump outlet valve; After confirming that the water pump has been started for a second preset time, adjusting the pressure regulating valve so that the first pressure gauge displays a second preset pressure value; At a second preset pressure value, connecting the second mechanical seal assembly and the reducer with a transmission chain; The leakage rate is monitored by one or more of two level probes placed in the oil and water collection cup and the high and low pressure collection cups.

6. The method for detecting leakage of a mechanical seal assembly according to claim 5, characterized in that: Using the device for detecting leakage of a mechanical seal assembly as described in any one of claims 2 to 4, Wherein, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collection cup and the high-low pressure collection cup, including: If the second preset pressure value is 1Mpa, the leakage rate at the low-pressure leakage collection port is monitored by the high and low pressure collection measuring cups to see if it exceeds the preset standard value; If the high and low pressure collection cups detect that the leakage rate at the low pressure leakage collection port exceeds the preset standard value, the liquid level probes placed in the high and low pressure collection cups will send resistance signals to the control panel for alarm display, and the control panel will issue a command to stop the motor.

7. The method for detecting leakage of a mechanical seal assembly according to claim 5, characterized in that: Using the device for detecting leakage of a mechanical seal assembly as described in any one of claims 2 to 4, Wherein, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collection cup and the high-low pressure collection cup, including: If the second preset pressure value is 3.45Mpa, the leakage rate at the oil leakage collection port is monitored by the oil-water collection measuring cup to see if it exceeds the preset standard value; If the oil-water collection cup detects that the leakage rate at the oil leakage collection port exceeds the preset standard value, the liquid level probe placed in the oil-water collection cup will send a resistance signal to the control panel for alarm display, and the control panel will issue a command to stop the motor.

8. The method for detecting leakage of a mechanical seal assembly according to claim 5, characterized in that: Using the device for detecting leakage of a mechanical seal assembly as described in any one of claims 2 to 4, Wherein, the leakage rate is monitored by any one or more of the two liquid level probes placed in the oil-water collection cup and the high-low pressure collection cup, including: If the second preset pressure value is 11.2Mpa, the leakage rate at the high-pressure leakage collection port is monitored by the high- and low-pressure collection measuring cups to see if it exceeds the preset standard value, and the leakage rate at the oil-water leakage collection port is monitored by the oil-water collection measuring cups to see if it exceeds the preset standard value; If the high and low pressure collection cups detect that the leakage rate at the high pressure leakage collection port exceeds the preset standard value, the liquid level probes placed in the high and low pressure collection cups will send resistance signals to the control panel for alarm display, and the control panel will issue a command to stop the motor; If the oil-water collection cup detects that the leakage rate at the oil-water leakage collection port exceeds the preset standard value, the liquid level probe placed in the oil-water collection cup will send a resistance signal to the control panel for alarm display, and the control panel will issue a command to stop the motor.

9. The method for detecting leakage of a mechanical seal assembly according to any one of claims 6 to 8, characterized in that: Also includes: After stopping the motor, tighten the first mechanical seal assembly and the second mechanical seal assembly with a torque wrench.

10. The method for detecting leakage of a mechanical seal assembly according to any one of claims 5 to 8, characterized in that: After monitoring the leakage rate through any one or more of the two liquid level probes placed in the oil and water collection cup and the high and low pressure collection cups, it also includes: After all tests are completed, stop the water pump, open the steam trap, drain all the desalted water in the pipeline and the mechanical seal test chamber, and remove the first mechanical seal assembly and the second mechanical seal assembly.

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