Positive and negative pressure leak detection device

Abstract

The utility model relates to the technical field of vacuum heat treatment equipment, in particular to a positive and negative pressure leak detection device, which comprises a sealed detection bin, a positive pressure source assembly, a negative pressure source assembly, a water injection and drainage assembly, a gas supply assembly and a gas leak detector, a detection cavity is formed in the sealed detection bin, a detection pipeline is arranged on the side wall of the sealed detection bin, one end of the detection pipeline is located in the detection cavity and used for installing a to-be-detected part, and the other end of the detection pipeline is communicated with the positive pressure source assembly, the negative pressure source assembly and the gas leak detector. The positive pressure source assembly is used for introducing gas into the detection cavity, and the negative pressure source assembly is used for vacuumizing the detection pipeline; a water injection and drainage assembly and an air supply assembly are further arranged on the side wall of the sealed detection bin and communicate with the detection cavity. The positive and negative pressure leak detection device provided by the utility model not only can carry out inflation positive pressure leak detection, but also can carry out vacuum negative pressure leak detection, does not need to disassemble a part to be detected, has higher detection efficiency, and can effectively improve the production efficiency and shorten the manufacturing period.

Description

Technical Field

[0001] This utility model relates to the field of vacuum heat treatment equipment technology, specifically to a positive and negative pressure leak detection device. Background Technology

[0002] A vacuum furnace is an industrial equipment that performs high-temperature heat treatment in a vacuum or controlled atmosphere environment. It is widely used in processes such as metal sintering, brazing, annealing, quenching, and crystal growth.

[0003] The most important production indicator for a vacuum furnace is that it must not leak. Negative vacuum pressure must not leak, and positive gas pressure must not leak either. Therefore, the airtightness of the components used in the installation of the vacuum furnace must meet high requirements. Before assembly, warehouse and quality control personnel need to conduct an initial inspection of each component. The current inspection method is to use independent positive pressure leakage detection equipment or negative pressure leakage detection equipment to perform positive and negative pressure leakage tests on each component separately. The overall inspection efficiency is low, which affects production efficiency. Utility Model Content

[0004] (I) This utility model provides a positive and negative pressure leak detection device to alleviate the technical problem of low efficiency in detecting positive and negative pressure leaks in vacuum furnace components in the prior art.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, embodiments of this utility model provide a positive and negative pressure leak detection device, including a sealed detection chamber, a positive pressure source assembly, a negative pressure source assembly, an injection and drainage assembly, a gas supply assembly, and a gas leak detector;

[0007] A detection chamber is formed inside the sealed detection chamber. A detection pipe is provided on the side wall of the sealed detection chamber. One end of the detection pipe is located in the detection chamber and is used to install the part to be tested. The other end of the detection pipe protrudes from the side wall of the sealed detection chamber and is connected to the positive pressure source assembly, the negative pressure source assembly and the gas leak detector, respectively.

[0008] The positive pressure source assembly is used to introduce gas into the detection chamber, and the negative pressure source assembly is used to evacuate the detection pipeline;

[0009] The side wall of the sealed detection chamber is also provided with the water injection / drainage assembly and the air supply assembly, both of which are connected to the detection chamber.

[0010] Furthermore, the detection pipe is provided with a connection part at one end of the detection cavity, and multiple mounting flanges are arranged at intervals along the length direction of the connection part.

[0011] Furthermore, the positive pressure source assembly includes an inflation pipe, an inflation valve, and an inflation tank;

[0012] One end of the inflation pipe is connected to the detection pipe, and the other end is connected to the gas storage tank. The inflation valve is located on the inflation pipe.

[0013] Furthermore, this includes water injection pipes, drainage pipes, water injection valves, and drainage valves;

[0014] The water injection pipe is located on the side wall of the sealed detection chamber and communicates with the detection cavity; the water injection valve is located on the water injection pipe.

[0015] The drainage pipe is located at the bottom of the sealed detection chamber and communicates with the bottom of the detection cavity; the drainage valve is located on the drainage pipe.

[0016] Furthermore, the top of the detection cavity is provided with an observation area, which is connected to the detection cavity, and an openable and closable sealing cover is provided on the outside of the observation area.

[0017] Furthermore, the negative pressure source assembly includes an air extraction pipe, an air extraction valve, and a power pump unit;

[0018] One end of the extraction pipe is connected to the detection pipe, and the other end is connected to the output end of the power pump unit. The extraction valve is located in the extraction pipe.

[0019] Furthermore, the power pump unit includes a vacuum pump and a mechanical pump, with the output end of the vacuum pump connected to the air extraction pipe and the output end of the mechanical pump connected to the vacuum pump.

[0020] Furthermore, the gas supply assembly includes a gas supply pipe and a gas supply valve;

[0021] The gas supply pipe is located on the outer wall of the sealed detection chamber, the gas supply pipe is connected to the detection chamber, and the gas supply valve is located on the gas supply pipe.

[0022] Furthermore, the gas leak detector is connected to the gas extraction pipe via a leak detection pipe, and the leak detection pipe is equipped with a leak detection valve.

[0023] Furthermore, a pressure relief valve is provided at the end of the detection pipe that is away from the detection chamber.

[0024] The beneficial effects of this utility model are:

[0025] This utility model provides a positive and negative pressure leak detection device, including a sealed detection chamber, a positive pressure source component, a negative pressure source component, an injection and drainage component, a gas supply component, and a gas leak detector. A detection chamber is formed within the sealed detection chamber, and the detection chamber is connected to the positive pressure source component, the negative pressure source component, and the gas leak detector via detection pipes. The part to be tested is installed at the end of the detection pipe located inside the detection chamber. Simultaneously, the injection and drainage component and the gas supply component are also provided on the side wall of the sealed detection chamber, both of which are connected to the detection chamber. When a positive pressure leak detection is required, water is first injected into the detection chamber through the injection and drainage component until it covers the part to be tested, and then water is injected into the detection chamber through the positive pressure source component. By introducing gas and observing whether bubbles continuously emerge from the water inside the detection chamber, it can be determined whether the part is leaking. When vacuum negative pressure leak detection is required, firstly, the water inside the detection chamber is completely drained through the injection and drainage assembly, then the detection pipeline is evacuated through the negative pressure source assembly and the gas leak detector is turned on. Finally, the detection gas is injected into the detection chamber through the gas supply assembly, and it is observed whether the gas leak detector alarms to determine whether the part is leaking. The positive and negative pressure leak detection device provided in this embodiment can perform both positive pressure leak detection and vacuum negative pressure leak detection without disassembling the part to be tested, which has high detection efficiency and can effectively improve production efficiency and shorten the manufacturing cycle. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of a positive and negative pressure leak detection device provided in an embodiment of the present invention.

[0028] icon:

[0029] 100-Sealed test chamber; 101-Test cavity; 102-Test pipe; 103-Connection; 104-Mounting flange; 105-Sealing cover; 106-Pressure relief valve;

[0030] 200-Positive pressure source assembly; 201-Inflation pipe; 202-Inflation valve; 203-Inflation tank;

[0031] 300 - Negative pressure source assembly; 301 - Extraction pipe; 302 - Extraction valve; 303 - Vacuum pump; 304 - Mechanical pump;

[0032] 400 - Injection and drainage assembly; 401 - Injection pipe; 402 - Drainage pipe; 403 - Injection valve; 404 - Drainage valve;

[0033] 500 - Gas supply assembly; 501 - Gas supply pipeline; 502 - Gas supply valve;

[0034] 600 - Gas leak detector; 601 - Leak detection pipeline; 602 - Leak detection valve. Detailed Implementation

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" 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; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] like Figure 1 As shown, this utility model provides a positive and negative pressure leak detection device, comprising a sealed detection chamber 100, a positive pressure source assembly 200, a negative pressure source assembly 300, an injection and drainage assembly 400, a gas supply assembly 500, and a gas leak detector 600.

[0039] A detection chamber 101 is formed inside the sealed detection chamber 100. A detection pipe 102 is provided on the side wall of the sealed detection chamber 100. One end of the detection pipe 102 is located in the detection chamber 101 and is used to install the part to be tested. The other end of the detection pipe 102 protrudes from the side wall of the sealed detection chamber 100 and is connected to the positive pressure source assembly 200, the negative pressure source assembly 300 and the gas leak detector 600 respectively.

[0040] The positive pressure source assembly 200 is used to introduce gas into the detection chamber 101, and the negative pressure source assembly 300 is used to evacuate the detection pipe 102.

[0041] The side wall of the sealed detection chamber 100 is also provided with a water injection / drainage assembly 400 and an air supply assembly 500, both of which are connected to the detection chamber 101.

[0042] In this embodiment, the positive and negative pressure leak detection device includes a sealed detection chamber 100, a positive pressure source assembly 200, a negative pressure source assembly 300, an injection / drainage assembly 400, a gas supply assembly 500, and a gas leak detector 600. A detection chamber 101 is formed within the sealed detection chamber 100. The detection chamber 101 is connected to the positive pressure source assembly 200, the negative pressure source assembly 300, and the gas leak detector 600 via detection pipes 102. The part to be tested is installed at the end of the detection pipe 102 located within the detection chamber 101. Simultaneously, the injection / drainage assembly 400 and the gas supply assembly 500 are also provided on the side wall of the sealed detection chamber 100. Both the injection / drainage assembly 400 and the gas supply assembly 500 are connected to the detection chamber 101. When a positive pressure leak detection is required, water is first injected into the detection chamber 101 through the injection / drainage assembly 400 until it covers the part to be tested. The part is then tested by introducing gas into the detection chamber 101 through the positive pressure source assembly 200. Observing whether bubbles continuously emerge from the water inside the detection chamber 101 can determine whether the part is leaking. When vacuum negative pressure leak detection is required, the water inside the detection chamber 101 is first completely drained through the water injection and drainage assembly 400. Then, the detection pipe 102 is evacuated through the negative pressure source assembly 300 and the gas leak detector 600 is turned on. Finally, the detection gas is injected into the detection chamber 101 through the gas supply assembly 500. Observing whether the gas leak detector 600 alarms can determine whether the part is leaking. The positive and negative pressure leak detection device provided in this embodiment can perform both positive pressure leak detection and vacuum negative pressure leak detection without disassembling the part to be tested. It has high detection efficiency, which can effectively improve production efficiency and shorten the manufacturing cycle.

[0043] According to one embodiment provided by this utility model, such as Figure 1 As shown, the detection pipe 102 is provided with a connection part 103 at one end of the detection chamber 101, and multiple mounting flanges 104 are arranged at intervals along the length direction of the connection part 103.

[0044] In this embodiment, a connecting part 103 is provided at one end of the detection pipe 102 located inside the detection chamber 101. The connecting part 103 has a hollow structure and communicates with the interior of the detection pipe 102. Multiple mounting flanges 104 are provided on the side of the connecting part 103 facing the detection chamber 101. The multiple mounting flanges 104 are spaced apart along the length direction of the connecting part 103. Preferably, the multiple mounting flanges 104 are of different models, so that the positive and negative pressure detection device provided in this embodiment can simultaneously perform positive pressure inflation and negative pressure vacuum leakage detection on different models of components, thereby improving detection efficiency and overall applicability.

[0045] According to one embodiment provided by this utility model, such as Figure 1 As shown, the positive pressure source assembly 200 includes an inflation pipe 201, an inflation valve 202, and an air storage tank 203;

[0046] One end of the inflation pipe 201 is connected to the detection pipe 102, and the other end is connected to the air storage tank 203. The inflation valve 202 is located on the inflation pipe 201.

[0047] In this embodiment, the inflation pipe 201 is equipped with an inflation valve 202. By controlling the opening and closing of the inflation valve 202, the gas stored in the gas storage tank 203 can be controlled to be introduced into the detection channel. Preferably, the gas in the gas storage tank 203 is nitrogen or air. Of course, the inflation valve 202 can be a manually operated valve, which makes it convenient for quality inspectors to control the inflation pipe 201 to inject gas into the detection pipe 102.

[0048] According to one embodiment provided by this utility model, such as Figure 1 As shown, the water injection and drainage assembly 400 includes a water injection pipe 401, a water drainage pipe 402, a water injection valve 403, and a water drainage valve 404;

[0049] Water injection pipe 401 is located on the side wall of sealed detection chamber 100 and is connected to detection chamber 101; water injection valve 403 is located on water injection pipe 401.

[0050] The drain pipe 402 is located at the bottom of the sealed detection chamber 100 and is connected to the bottom of the detection chamber 101; the drain valve 404 is located on the drain pipe 402.

[0051] In this embodiment, when it is necessary to check the positive pressure leakage of the part to be tested in the detection chamber 101, first open the water injection valve 403 and inject water into the detection chamber 101 through the water injection pipe 401 until it covers the part. At this time, open the air inflation valve 202 and inject gas into the detection pipe 102 through the air inflation pipe 201. Observe whether there are bubbles continuously emerging in the water to determine whether the part is leaking. After the positive pressure test is completed, open the drain valve 404 and completely drain the water inside the detection chamber 101 through the drain channel connected to the bottom of the detection chamber 101 to facilitate the vacuum negative pressure test.

[0052] Of course, both the water injection valve 403 and the drain valve 404 can be manually operated, which makes it easy for quality inspectors to control the water injection pipe 401 and the drain pipe 402 to inject or drain water into the test chamber 101.

[0053] According to one embodiment provided by this utility model, such as Figure 1 As shown, the top of the detection chamber 101 is provided with an observation area, which is connected to the detection chamber 101. An openable and closable sealing cover 105 is provided on the outside of the observation area.

[0054] In this embodiment, an observation area is provided at the top of the detection chamber 101, and an openable and closable sealing cover 105 is provided outside the observation area. By opening the sealing cover 105, it is possible to observe whether bubbles are continuously generated in the water inside the detection chamber 101 through the observation area, which is intuitive and convenient. In other words, after opening the sealing cover 105, the detection chamber 101 is easily connected to the atmosphere. When the sealing cover 105 is closed, the detection chamber 101 is in a sealed state.

[0055] Of course, the sealed detection chamber 100 can also be made into a transparent chamber, and the observation area can be set on the side wall of the sealed detection chamber 100. Similarly, the observation area can be used to observe whether there are bubbles continuously emerging from the water inside the detection chamber 101 during the positive pressure leakage detection.

[0056] According to one embodiment provided by this utility model, such as Figure 1 As shown, the negative pressure source assembly 300 includes an air extraction pipe 301, an air extraction valve 302, and a power pump set;

[0057] One end of the air extraction pipe 301 is connected to the detection pipe 102, and the other end is connected to the output end of the power pump unit. The air extraction valve 302 is located in the air extraction pipe 301.

[0058] In this embodiment, the air extraction pipe 301 is equipped with an air extraction valve 302. The air extraction pipe 301 is connected to the detection pipe 102 and is also connected to the output end of the power pump unit. Therefore, the detection pipe 102 can be evacuated through the air extraction pipe 301 to facilitate vacuum negative pressure leakage detection.

[0059] According to one embodiment provided by this utility model, such as Figure 1 As shown, the power pump set includes a vacuum pump 303 and a mechanical pump 304. The output end of the vacuum pump 303 is connected to the air extraction pipe 301, and the output end of the mechanical pump 304 is connected to the vacuum pump 303.

[0060] In this embodiment, the synergistic pumping effect of using a vacuum pump 303 (such as a Roots pump) and a mechanical pump 304 (such as a rotary vane pump or a screw pump) is better than using a single pump alone. This can significantly improve pumping speed, ultimate vacuum, and efficiency, thereby ensuring the accuracy of vacuum negative pressure leakage detection.

[0061] According to one embodiment provided by this utility model, such as Figure 1 As shown, the gas supply assembly 500 includes a gas supply pipe 501 and a gas supply valve 502;

[0062] The gas supply pipe 501 is located on the outer wall of the sealed detection chamber 100. The gas supply pipe 501 is connected to the detection chamber 101. The gas supply valve 502 is located on the gas supply pipe 501.

[0063] In this embodiment, the side wall of the sealed detection chamber 100 is also provided with a gas supply pipe 501. When performing vacuum negative pressure leakage detection, after the detection pipe 102 is evacuated, the gas supply valve 502 is opened, and the detection gas is introduced into the detection chamber 101 through the gas supply pipe 501. Then, whether the gas leak detector 600 connected to the detection channel alarms can be used to determine whether the part is leaking.

[0064] According to one embodiment provided by this utility model, such as Figure 1 As shown, the gas leak detector 600 is connected to the gas extraction pipe 301 through the leak detection pipe 601, and the leak detection pipe 601 is equipped with a leak detection valve 602.

[0065] In this embodiment, when the leak detection valve 602 is opened, since the leak detection channel is connected to the air extraction pipe 301, that is, the leak detection pipe 601 is connected to the detection pipe 102, when the gas supply pipe 501 introduces detection gas into the detection chamber 101, if the parts in the detection chamber 101 leak, the gas leak detector 600 will alarm.

[0066] Preferably, helium is used as the detection gas introduced into the gas supply pipe 501, and helium leak detector 600 is used. If the parts leak under vacuum negative pressure, the helium leak detector will generate an alarm.

[0067] According to one embodiment provided by this utility model, such as Figure 1 As shown, a pressure relief valve 106 is provided at the end of the detection pipe 102 that is away from the detection chamber 101.

[0068] In this embodiment, when the positive pressure leakage detection is completed and the vacuum negative pressure leakage detection needs to be performed, the pressure relief valve 106 set at the end of the detection pipe 102 away from the detection chamber 101 is opened first to release the pressure in the detection pipe 102, so as to ensure the effect of the subsequent vacuum negative pressure detection.

[0069] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positive and negative pressure leak detection device, characterized by, It includes a sealing detection chamber (100), a positive pressure source assembly (200), a negative pressure source assembly (300), an injection and drainage assembly (400), a gas supply assembly (500), and a gas leak detector (600); The sealed detection chamber (100) forms a detection cavity (101). The side wall of the sealed detection chamber (100) is provided with a detection pipe (102). One end of the detection pipe (102) is located in the detection cavity (101) and is used to install the part to be tested. The other end of the detection pipe (102) protrudes from the side wall of the sealed detection chamber (100) and is connected to the positive pressure source assembly (200), the negative pressure source assembly (300) and the gas leak detector (600) respectively. The positive pressure source assembly (200) is used to introduce gas into the detection chamber (101), and the negative pressure source assembly (300) is used to evacuate the detection pipe (102); The side wall of the sealed detection chamber (100) is also provided with the water injection and drainage assembly (400) and the air supply assembly (500), both of which are connected to the detection chamber (101).

2. The positive and negative pressure leak detection device of claim 1, wherein, The detection pipe (102) is provided with a connection part (103) at one end of the detection chamber (101), and multiple mounting flanges (104) are arranged at intervals along the length direction of the connection part (103).

3. The positive and negative pressure leak detection device of claim 2, wherein, The positive pressure source assembly (200) includes an inflation pipe (201), an inflation valve (202), and an air storage tank (203); One end of the inflation pipe (201) is connected to the detection pipe (102), and the other end is connected to the gas storage tank (203). The inflation valve (202) is located on the inflation pipe (201).

4. The positive and negative pressure leak detection device of claim 3, wherein, The water injection and drainage assembly (400) includes a water injection pipe (401), a drainage pipe (402), a water injection valve (403), and a drainage valve (404); The water injection pipe (401) is located on the side wall of the sealed detection chamber (100) and is connected to the detection chamber (101). The water injection valve (403) is located on the water injection pipe (401). The drainage pipe (402) is located at the bottom of the sealed detection chamber (100) and communicates with the bottom of the detection cavity (101); the drainage valve (404) is located on the drainage pipe (402).

5. The positive and negative pressure leak detection device of claim 4, wherein, The top of the detection chamber (101) is provided with an observation area, which is connected to the detection chamber (101), and an openable and closable sealing cover (105) is provided on the outside of the observation area.

6. The positive and negative pressure leak detection device of claim 2, wherein, The negative pressure source assembly (300) includes an air extraction pipe (301), an air extraction valve (302), and a power pump assembly; One end of the extraction pipe (301) is connected to the detection pipe (102), and the other end is connected to the output end of the power pump group. The extraction valve (302) is located in the extraction pipe (301).

7. The positive and negative pressure leak detection device of claim 6, wherein, The power pump assembly includes a vacuum pump (303) and a mechanical pump (304). The output end of the vacuum pump (303) is connected to the air extraction pipe (301), and the output end of the mechanical pump (304) is connected to the vacuum pump (303).

8. The positive and negative pressure leak detection device of claim 7, wherein, The gas supply assembly (500) includes a gas supply pipe (501) and a gas supply valve (502); The gas supply pipe (501) is located on the outer wall of the sealed detection chamber (100), the gas supply pipe (501) is connected to the detection chamber (101), and the gas supply valve (502) is located on the gas supply pipe (501).

9. The positive and negative pressure leak detection device according to claim 8, characterized in that, The gas leak detector (600) is connected to the gas extraction pipe (301) through a leak detection pipe (601), and the leak detection pipe (601) is equipped with a leak detection valve (602).

10. The positive and negative pressure leak detection device of any one of claims 1-9, wherein, The end of the detection pipe (102) away from the detection chamber (101) is provided with a pressure relief valve (106).

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