Seawater circulating pump sealing air bag pressure test device and method

Abstract

The invention particularly relates to a seawater circulating pump sealing air bag pressure test device and an inspection method, and belongs to the technical field of nuclear power station nuclear-grade fluid machinery maintenance engineering. The device comprises an upper box body, a lower box body, a false shaft sleeve, a water side pressing hole and an air side pressing hole, the upper box body and the lower box body are detachably connected and jointly form a closed cavity used for containing an air bag. The upper box body and the lower box body are fastened and connected through a fixing piece; the false shaft sleeve is arranged in a closed cavity formed by the upper box body and the lower box body and is used for providing a simulated supporting surface for the air bag; the air side pressurizing hole is formed in the upper box body and / or the lower box body and used for being connected with an external air source and inflating the air bag; the water side pressurizing hole is formed in the false shaft sleeve and used for being connected with an external pressurizing pump and injecting water into the space between the false shaft sleeve and the air bag to apply pressure. According to the method, the device is used for carrying out the air bag pressing test. According to the invention, the actual working state of the air bag is simulated, and the integrity test and the seawater sealing performance test under the rated pressure are safely carried out on the air bag.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant nuclear-grade fluid machinery maintenance engineering technology, specifically to a pressure testing device and method for a seawater circulating pump sealing airbag. Background Technology

[0002] The seawater circulation pump in the nuclear power plant employs a shutdown airbag sealing structure. Its function is to inflate the pump shaft protective sleeve with an external air source when the pump stops, thus sealing the pump and preventing seawater backflow. The airbag sealing structure consists of a gland and two rubber airbags, with a rated operating pressure of 0.8 MPa.

[0003] Currently, airbags are only tested for integrity using compressed air at 0.1 MPa during factory testing. This pressure is far below their actual operating pressure and cannot effectively verify their reliability under rated operating conditions. If the rated operating pressure is used to test an uninstalled airbag, the lack of constraint from the plenum and bushings can easily lead to over-inflation and rupture. Therefore, there is an urgent need for a testing device and method that can simulate the actual sealing conditions of an airbag and safely and effectively verify its integrity and sealing performance before installation. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a test device and method for pressurizing the sealing airbag of a seawater circulation pump, which simulates the actual working state of the airbag and safely performs integrity testing and seawater sealing performance testing under rated pressure.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pressure testing device for a sealing airbag of a seawater circulation pump includes an upper casing, a lower casing, a dummy bushing, a water-side pressure testing hole, and an air-side pressure testing hole.

[0007] The upper and lower boxes are detachably connected and together form a closed chamber for accommodating the airbag; the upper and lower boxes are fastened together by fasteners.

[0008] The dummy bushing is set in the closed cavity formed by the upper and lower boxes to provide a simulated support surface for the airbag;

[0009] The air-side pressure hole is located on the upper and / or lower envelope and is used to connect an external air source and inflate the airbag;

[0010] The water-side pressure hole is located on the dummy bushing and is used to connect an external pressure pump and inject water to pressurize the space between the dummy bushing and the air bladder.

[0011] As one possible approach, the seawater circulation pump sealing airbag pressure test device also includes a positioning element for positioning when the upper and lower boxes are connected.

[0012] One possible approach is to use a locating pin as the positioning element.

[0013] One possible method is to use a fixing bolt as the fastener.

[0014] One possible approach is to place the airbag in the lower housing with the air inlet aligned with the air-side pressurization hole; the upper housing is placed on top of the lower housing, positioned by a locating pin, and fastened by fixing bolts.

[0015] One possible approach is to use a manual external pressure pump.

[0016] The present invention also provides a method for pressurizing the sealing airbag of a seawater circulation pump, using the above-mentioned seawater circulation pump sealing airbag pressurization test device, comprising the following steps:

[0017] Assembly: Place the airbag to be tested into the lower chamber and align the air inlet of the airbag with the air-side pressurization hole. Then install the upper chamber to form a closed test environment.

[0018] Air-side pressure test: Connect an external air source to the air-side pressure port, inflate the airbag to a predetermined pressure and maintain the pressure to verify the integrity of the airbag seal.

[0019] Water-side pressure test: Connect an external pressure pump to the water-side pressure port and inject liquid into the space between the dummy bushing and the airbag to a predetermined pressure to test the liquid sealing performance of the airbag.

[0020] As one possible approach, in the air-side pressure test, the predetermined pressure is the rated working pressure of the airbag, which is 0.8 MPa.

[0021] As one possible approach, in the water-side pressure test, the predetermined pressure is 0.2 MPa.

[0022] As one possible approach, water is used as the liquid in the water-side pressure test.

[0023] Beneficial technical effects of the present invention:

[0024] The seawater circulation pump sealing airbag pressure test device of the present invention has a simple structure and is easy to operate. It can simulate the actual working conditions of the airbag seal. It can effectively check the integrity of the airbag under the rated working pressure and its sealing performance to seawater before installation, avoiding repeated work and waste of resources due to abnormal spare parts. The constraint of the plenum and the dummy bushing ensures that the airbag will not be damaged during the high-pressure test, and the test is safe and reliable. Attached Figure Description

[0025] Figure 1Schematic diagram of on-site installation of the sealing airbag for a seawater circulation pump;

[0026] Figure 2 This is a front view of an embodiment of the seawater circulation pump sealing airbag pressure test device of the present invention;

[0027] Figure 3 This is a top view of an embodiment of the seawater circulation pump sealing airbag pressure test device of the present invention;

[0028] Figure 4 This is a schematic diagram illustrating the use of an embodiment of the seawater circulation pump sealing airbag pressure test device of the present invention.

[0029] In the diagram, 1. Upper box body; 2. Lower box body; 3. Dummy bushing; 4. Locating pin; 5. Fixing bolt; 6. Water-side pressure hole; 7. Air-side pressure hole; 8. External air source; 9. External pressure pump; 10. Box body; 11. Airbag; 12. Bushing. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] See Figure 2-3 This embodiment provides a seawater circulation pump sealing airbag pressure test device, including an upper casing 1, a lower casing 2, a dummy bushing 3, a water-side pressure test hole 6 and an air-side pressure test hole 7;

[0034] The upper chamber 1 and the lower chamber 2 are detachably connected and together form a closed chamber for accommodating the airbag; the upper chamber 1 and the lower chamber 2 are fastened together by fasteners.

[0035] The dummy bushing 3 is set in the closed cavity formed by the upper body 1 and the lower body 2, and is used to provide a simulated support surface for the airbag;

[0036] The air-side pressure hole 7 is provided on the upper box 1 and / or the lower box 2, and is used to connect the external air source 8 and inflate the airbag;

[0037] The water-side pressure hole 6 is provided on the dummy bushing 3 and is used to connect the external pressure pump 9 and inject water to pressurize the space between the dummy bushing 3 and the air bladder.

[0038] In this embodiment, the seawater circulation pump sealing airbag pressure test device also includes a positioning component for positioning when the upper body 1 and the lower body 2 are connected.

[0039] In this embodiment, the positioning element is a positioning pin 4, and there are two positioning pins 4.

[0040] In this embodiment, the fixing component is the fixing bolt 5.

[0041] In this embodiment, the airbag is placed in the lower box 2, and the air inlet is aligned with the air-side pressure hole 7; the upper box 1 is placed on the lower box 2, positioned by the positioning pin 4, and fastened by the fixing bolt 5.

[0042] In this embodiment, the external pressure pump 9 is a manual pressure pump.

[0043] This embodiment also provides a method for pressurizing the sealing airbag of a seawater circulation pump, using the aforementioned seawater circulation pump sealing airbag pressurization test device, including the following steps:

[0044] Assembly: First, remove the upper chamber 1 and place the airbag to be tested into the lower chamber 2, ensuring that the air inlet of the airbag is aligned with the air-side pressurization hole 7; then, install the upper chamber 1 and insert two positioning pins 4 for precise positioning to prevent misalignment; subsequently, use fixing bolts 5 to tightly connect the upper chamber 1 and the lower chamber 2 to form a closed test chamber.

[0045] Air-side pressure test: Connect the external air source 8 to the air-side pressure port 7, inflate the airbag to the predetermined pressure and maintain the pressure for a period of time, observe whether the pressure gauge reading is stable, in order to determine whether the airbag is leaking or damaged.

[0046] Water-side pressure test: Connect the manual pressure pump to the water-side pressure hole 6, inject clean water into the annular space between the outer wall of the dummy bushing 3 and the inner wall of the airbag to the predetermined pressure and maintain the pressure, check whether the airbag has water leakage, thereby simulating and testing the sealing performance of the airbag under seawater pressure.

[0047] After the test, disassemble the air source and manual pressure pump, loosen the fixing bolt 5, pull out the positioning pin 4, remove the upper body 1, and the airbag that has completed the test can be taken out.

[0048] In this embodiment, during the air-side pressure test, the predetermined pressure is the rated working pressure of the airbag, which is 0.8 MPa.

[0049] In this embodiment, the predetermined pressure in the water-side pressure test is 0.2 MPa.

[0050] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A seawater circulating pump seal bladder press test device, characterized by, The device comprises an upper housing (1), a lower housing (2), a dummy shaft sleeve (3), a water-side press hole (6) and a gas-side press hole (7); The upper housing (1) and the lower housing (2) are detachably connected and jointly form a closed chamber for accommodating the air bag; the upper housing (1) and the lower housing (2) are fastened by a fixing member; The dummy shaft sleeve (3) is arranged in the closed chamber formed by the upper housing (1) and the lower housing (2) and is used for providing a simulated support surface for the air bag; The gas-side press hole (7) is arranged on the upper housing (1) and / or the lower housing (2) and is used for connecting an external gas source (8) and inflating the air bag; The water-side press hole (6) is arranged on the dummy shaft sleeve (3) and is used for connecting an external press pump (9) and injecting water into the space between the dummy shaft sleeve (3) and the air bag.

2. The seawater circulating pump seal bladder press test device of claim 1, wherein, The device further comprises a positioning member for positioning when the upper housing (1) and the lower housing (2) are connected.

3. The seawater circulating pump seal bladder crimping test device of claim 2, wherein, The positioning member is a positioning pin (4).

4. The seawater circulating pump seal bladder crimping test device of claim 3, wherein, The fixing member is a fixing bolt (5).

5. The seawater circulating pump seal bladder crimping test device of claim 4, wherein, The air bag is placed in the lower housing (2) with the gas inlet aligned with the gas-side press hole (7); the upper housing (1) is placed on the lower housing (2) and is positioned by the positioning pin (4) and is fastened by the fixing bolt (5).

6. The seawater circulating pump seal bladder press test device of claim 1, wherein, The external press pump (9) is a manual press pump.

7. A method of testing a seawater circulating pump seal bladder for compression, the method comprising: providing a seawater circulating pump seal bladder; providing a bladder testing apparatus; and connecting the bladder testing apparatus to the seawater circulating pump seal bladder. The device for testing the air bag of the seawater circulating pump seal is used according to any one of claims 1-6 and comprises the following steps: Assembly: the air bag to be tested is placed in the lower housing (2) with the gas inlet aligned with the gas-side press hole (7), and then the upper housing (1) is installed to form a closed test environment; Gas-side pressure test: the external gas source (8) is connected to the gas-side press hole (7) to inflate the air bag to a predetermined pressure and maintain the pressure to test the integrity of the air bag seal; Water-side pressure test: the external press pump (9) is connected to the water-side press hole (6) to inject liquid into the space between the dummy shaft sleeve (3) and the air bag to a predetermined pressure to test the liquid sealing performance of the air bag.

8. The seawater circulating pump seal bladder press test method of claim 7, wherein, In the gas-side pressure test, the predetermined pressure is the rated working pressure of the air bag, and the rated working pressure of the air bag is 0.8 MPa.

9. The seawater circulating pump seal bladder press test method of claim 7, wherein, In the water-side pressure test, the predetermined pressure is 0.2 MPa.

10. The seawater circulating pump seal bladder press test method of claim 7, wherein, In the water-side pressure test, the liquid is water.

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