Protective structure of air tightness detection device for instrument

Abstract

The utility model discloses a protective structure of an air tightness detection device for an instrument, and relates to the technical field of air tightness detection. Comprising an air tightness detection device, a protection device is installed on the air tightness detection device, the protection device has a pressed threshold value and relieves the air pressure exceeding the threshold value, a constant pressure device is arranged above the protection device, and the constant pressure device sets the pressed threshold value of the protection device. The connecting flange is arranged on the airtightness detection device to be connected with the pressure release valve, the pressure rod is arranged to apply pressure to the top of the connecting flange downwards, so that the triggering pressure threshold value of the pressure release valve is changed, and when airtightness detection is carried out on a to-be-detected device, the triggering sensitivity of the pressure release valve is changed according to the compression capacity of the to-be-detected device, and the airtightness detection accuracy is improved. When the air pressure exceeds the bearing capacity of the to-be-detected device, the pressure relief valve is ejected upwards, so that the pressure relief hole is exposed for pressure relief, and the effect of protecting the to-be-detected device is achieved.

Description

Technical Field

[0001] The utility model discloses a protective structure of an airtightness detection device for an instrument, which relates to the technical field of airtightness detection. Background Art

[0002] The gas tightness detector is also called leak detector, airtightness detector, leak detector, dry detector, and leak tester. The traditional method of testing the sealing of test pieces is to use the water or oil immersion visual bubble method. Its equipment is simple and the results are intuitive, but the detection accuracy and efficiency are low, and the human factor has a greater impact. It cannot achieve automatic quantitative leak detection. At the same time, it will also cause moisture, rust, impurity immersion and other adverse effects on the workpiece, as well as cumbersome post-processing of water (or oil) on the surface of the test piece. Some products are not even allowed to be tested by this method, such as: electronic and electrical components. It is also possible to fill the inside of the instrument to be tested with colored gas to determine whether there is a gas tightness problem.

[0003] For example, Chinese patent publication number: CN 220625670 U discloses an air tightness detection device, which includes: a first pipeline, on which a first pressure gauge, a second flow valve, and a second pressure gauge are arranged in sequence from left to right; the left end of the first pipeline is used to receive compressed gas, and the right end of the first pipeline is used to inflate the object to be tested to detect air tightness.

[0004] By means of the above-mentioned air tightness detection device, the air tightness of the object to be detected can be measured under the premise of protecting the object to be detected, thus avoiding water (or oil) adhering to the surface of the test piece, and detecting between equipment such as electrical components.

[0005] However, the following problems still exist during use: different devices to be tested are made of different materials and can withstand different pressures. When the pressure is too high, the device to be tested may be damaged, and the above-mentioned prior art does not provide a protective device to protect the device to be tested.

[0006] It can be seen that there is an urgent need for a protective structure for an airtightness detection device for an instrument, which is used to protect the device while detecting the airtightness of the device. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of the utility model is to improve the safety technology of the existing airtightness detection device, and provide a protective structure for an airtightness detection device for an instrument, which adopts a constant pressure and pressure relief technical solution. The beneficial effect is that the air pressure can be adjusted according to the pressure-bearing capacity of the product to be tested to protect the device.

[0008] The purpose of the utility model is achieved in this way:

[0009] A protective structure for an air tightness detection device for an instrument, comprising an air tightness detection device, a protective device installed on the air tightness detection device, the protective device having a pressure threshold, and relieving the pressure exceeding the threshold, a constant pressure device is arranged above the protective device, and the constant pressure device sets the pressure threshold of the protective device;

[0010] The protection device comprises a connecting flange, which is mounted on the outer surface of the air tightness detection device, a pressure relief valve which can move up and down is mounted on the axis of the connecting flange, and one end of the pressure relief valve is located inside the air tightness detection device, and the other end of the pressure relief valve is located outside the air tightness detection device, and a pressure relief hole is opened on the pressure relief valve, and the pressure relief hole cooperates with the air tightness detection device to seal when the pressure relief valve is within the pressure threshold;

[0011] The constant pressure device comprises a pressure rod, on which a pressing knob is mounted. The pressing knob is rotated to make the bottom of the pressure rod press the end of the pressure relief valve to increase the pressure resistance of the pressure relief valve.

[0012] Preferably, the airtightness detection device comprises an airtight cabinet, a sealing door is provided on the front of the airtight cabinet to seal the airtight cabinet as a whole, and the device to be detected is placed inside the airtight cabinet;

[0013] A pressurized pipe is installed on the side of the airtight cabinet, and high-pressure gas is injected into the interior of the airtight cabinet through the pressurized pipe. A pressure gauge and a solenoid valve are respectively installed on the pressurized pipe. The pressure gauge displays the air pressure inside the airtight cabinet, and the solenoid valve seals the pressurized pipe.

[0014] Preferably, a pressure display gauge is installed on the sealed door of the airtight cabinet, and the pressure display gauge displays the changes in the air pressure inside the airtight cabinet.

[0015] Preferably, a support frame is fixedly connected to the top of the airtight cabinet, the support frame is arch-shaped and a through hole is opened at the axis of the support frame, and the through hole is plugged into the pressure rod.

[0016] Preferably, an elastic member is sleeved on the outer surface of the pressure relief valve, and the elastic member applies downward pressure to the pressure relief valve.

[0017] Preferably, a positioning hole is provided on the top of the pressure relief valve, and the positioning hole limits the bottom of the pressure rod.

[0018] Preferably, a pressure index gauge is installed on the top of the pressure rod, a pressure gauge contact pin is arranged at the bottom of the pressure index gauge, and the pressure gauge contact pin extends to the bottom of the pressure rod and overlaps with the inner bottom of the positioning hole.

[0019] Beneficial effects:

[0020] First, a connecting flange is provided on the air tightness detection device to connect the pressure relief valve, and a pressure rod is provided to apply downward pressure to the top of the connecting flange, thereby changing the pressure threshold for triggering the pressure relief valve. When the sealing performance of the device to be tested is tested, the triggering sensitivity of the pressure relief valve is changed according to the pressure bearing capacity of the device to be tested. When the air pressure exceeds the bearing capacity of the device to be tested, the pressure relief valve is pushed upward to expose the pressure relief hole for pressure relief, thereby achieving the effect of protecting the device to be tested.

[0021] Secondly, by setting a pressure index gauge on the top of the pressure rod and making the pressure gauge needle at the bottom of the pressure index gauge overlap with the top of the pressure relief valve, when the pressure rod applies pressure to the pressure relief valve, the pressure can be directly displayed by the pointer of the pressure index gauge, so that the air pressure triggered by the pressure relief valve can be directly calculated according to the pressure value, thereby achieving the effect of being able to accurately adjust the pressure required for the pressure relief valve to trigger protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a cross-sectional view of the structure of the utility model;

[0024] Figure 3 This is a bottom view of the protective device structure of the utility model;

[0025] Figure 4 This is a top view of the protective device structure of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the constant pressure device of the utility model.

[0027] In the figure: 1. Air tightness detection device; 101. Airtight cabinet; 102. Pressurized pipe; 103. Pressure gauge; 104. Solenoid valve; 105. Pressure display gauge; 106. Support frame; 2. Protection device; 201. Connecting flange; 202. Pressure relief valve; 203. Pressure relief hole; 204. Elastic member; 205. Positioning hole; 3. Constant pressure device; 301. Pressure rod; 302. Press down knob; 303. Pressure index gauge; 304. Pressure gauge needle. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model will be further described in detail below with reference to the accompanying drawings.

[0029] A protective structure of an air tightness detection device for an instrument under this specific implementation mode, such as Figure 1-5As shown, it includes an air tightness detection device 1, on which a protection device 2 is installed, the protection device 2 has a pressure threshold, and releases the pressure exceeding the threshold, and a constant pressure device 3 is arranged above the protection device 2, and the constant pressure device 3 sets the pressure threshold of the protection device 2;

[0030] The protection device 2 includes a connecting flange 201, which is installed on the outer surface of the airtightness detection device 1. A pressure relief valve 202 that can move up and down is installed on the axis of the connecting flange 201, and one end of the pressure relief valve 202 is located inside the airtightness detection device 1, and the other end of the pressure relief valve 202 is located outside the airtightness detection device 1. A pressure relief hole 203 is opened on the pressure relief valve 202, and the pressure relief hole 203 cooperates with the airtightness detection device 1 to seal when the pressure relief valve 202 is within the pressure threshold;

[0031] The constant pressure device 3 includes a pressure rod 301, on which a pressing knob 302 is installed to facilitate pressing down and rotating the pressure rod 301. Rotating the pressing knob 302 causes the bottom of the pressure rod 301 to apply pressure to the end of the pressure relief valve 202 to increase the pressure resistance of the pressure relief valve 202.

[0032] Through the above technical solution, a connecting flange 201 is provided on the airtightness detection device 1 to connect the pressure relief valve 202, and a pressure rod 301 is provided to apply downward pressure to the top of the connecting flange 201, thereby changing the pressure threshold for triggering the pressure relief valve 202. When the sealing performance of the device to be tested is tested, the triggering sensitivity of the pressure relief valve 202 is changed according to the pressure bearing capacity of the device to be tested. When the air pressure exceeds the bearing capacity of the device to be tested, the pressure relief valve 202 is pushed upward and the pressure rod 301 floats upward, exposing the pressure relief hole 203 for pressure relief, thereby achieving the effect of protecting the device to be tested.

[0033] Specifically, the airtightness detection device 1 includes an airtight cabinet 101, a sealing door is provided on the front of the airtight cabinet 101, so that the airtight cabinet 101 is sealed as a whole, and the device to be detected is placed inside the airtight cabinet 101;

[0034] A pressurizing pipe 102 is installed on the side of the airtight cabinet 101, and high-pressure gas is injected into the interior of the airtight cabinet 101 through the pressurizing pipe 102. A pressure gauge 103 and a solenoid valve 104 are respectively installed on the pressurizing pipe 102. The pressure gauge 103 displays the internal air pressure of the airtight cabinet 101, and the solenoid valve 104 seals the pressurizing pipe 102.

[0035] Through the above technical solution, high-pressure gas is injected from the position of the pressurizing tube 102, so that the interior of the airtight cabinet 101 is filled with high pressure, and the pressurizing tube 102 is sealed by the solenoid valve 104 to keep the interior of the airtight cabinet 101 at high pressure. The barometer 103 shows that several atmospheres of high pressure have been injected. If the sealing of the device to be inspected inside the airtight cabinet 101 is good, the air pressure reading of the barometer 103 will remain stable. When the sealing of the device to be inspected inside the airtight cabinet 101 is not good, the high-pressure gas will penetrate into the interior of the device to be inspected, thereby causing the internal air pressure of the airtight cabinet 101 to decrease, thereby causing the reading of the barometer 103 to decrease. The change in the above reading can effectively determine whether the device to be inspected is sealed.

[0036] Specifically, an air pressure display gauge 105 is installed on the sealed door of the airtight cabinet 101 , and the air pressure display gauge 105 displays the air pressure change inside the airtight cabinet 101 .

[0037] Through the above technical solution, the purpose of setting the air pressure display gauge 105 on the sealed door of the airtight cabinet 101 is to make it more convenient for the monitor to observe the air pressure inside the airtight cabinet 101, and the air pressure display gauge 105 is closer to the device to be inspected than the air pressure gauge 103, and can observe the changes in air pressure more sensitively.

[0038] Specifically, a support frame 106 is fixedly connected to the top of the airtight cabinet 101 . The support frame 106 is arch-shaped and a through hole is opened at the axis of the support frame 106 . The through hole is plugged into the pressure rod 301 .

[0039] Through the above technical solution, the purpose of setting the support frame 106 is to support the pressure rod 301. The support frame 106 is connected to the pressure rod 301 by plugging, and the friction force at the connection is increased to enable the pressure rod 301 to maintain its position when it is not under pressure, so that the installation height of the pressure rod 301 is adjustable, thereby facilitating the change of the pressure applied to the pressure relief valve 202 to change the protection threshold of the pressure relief valve 202. When the pressure relief valve 202 is pressurized and pushed up, the pressure relief valve 202 and the pressure rod 301 will be gradually pushed upward, so that the pressure relief hole 203 is exposed for pressure relief.

[0040] Specifically, an elastic member 204 is sleeved on the outer surface of the pressure relief valve 202 , and the elastic member 204 applies downward pressure to the pressure relief valve 202 .

[0041] Through the above technical solution, the purpose of setting the elastic member 204 is to enable the pressure relief valve 202 to stably cooperate with the airtight cabinet 101 to achieve sealing, improve the pressure resistance of the pressure relief valve 202, and prevent the pressure relief valve 202 from floating up after being subjected to slight pressure.

[0042] Specifically, a positioning hole 205 is provided on the top of the pressure relief valve 202 , and the positioning hole 205 limits the bottom of the pressure rod 301 .

[0043] Through the above technical solution, a positioning hole 205 is opened at the top of the pressure relief valve 202, thereby improving the stability of the contact position between the positioning hole 205 and the pressure rod 301, and preventing the bottom of the pressure rod 301 from tilting and sliding when the pressure relief valve 202 presses the pressure rod 301.

[0044] Specifically, a pressure index gauge 303 is installed on the top of the pressure rod 301 , a pressure gauge contact pin 304 is arranged at the bottom of the pressure index gauge 303 , and the pressure gauge contact pin 304 extends to the bottom of the pressure rod 301 and overlaps with the inner bottom of the positioning hole 205 .

[0045] Through the above technical solution, the purpose of setting the pressure index table 303 is to facilitate and intuitively understand the pressure applied by the pressure rod 301 to the pressure relief valve 202, so as to accurately change the pressure relief threshold of the pressure relief valve 202.

[0046] When in use, the pressure relief valve 202 is connected by arranging a connection flange 201 on the air tightness detection device 1, and the pressure rod 301 is arranged to apply downward pressure to the top of the connection flange 201, thereby changing the pressure threshold for triggering the pressure relief valve 202. When the air tightness detection is performed on the device to be detected, the triggering sensitivity of the pressure relief valve 202 is changed according to the pressure bearing capacity of the device to be detected. When the air pressure exceeds the bearing capacity of the device to be detected, the pressure relief valve 202 is pushed upward, so that the pressure relief hole 203 is exposed for pressure relief, thereby achieving the effect of protecting the device to be detected.

[0047] By setting a pressure index gauge 303 on the top of the pressure rod 301, and making the pressure gauge contact needle 304 at the bottom of the pressure index gauge 303 overlap with the top of the pressure relief valve 202, when the pressure rod 301 applies pressure to the pressure relief valve 202, the pressure can be directly displayed by the pointer of the pressure index gauge 303, so that the air pressure triggered by the pressure relief valve 202 can be directly calculated according to the pressure value, thereby achieving the effect of being able to accurately adjust the pressure required for the pressure relief valve 202 to trigger the protection.

[0048] It should be noted that although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these specific embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective structure for an airtightness detection device for an instrument, comprising an airtightness detection device (1), characterized in that: The air tightness detection device (1) is provided with a protection device (2), the protection device (2) having a pressure threshold and relieving the air pressure exceeding the threshold, and a constant pressure device (3) is provided above the protection device (2), the constant pressure device (3) setting the pressure threshold of the protection device (2); The protection device (2) comprises a connecting flange (201), the connecting flange (201) is mounted on the outer surface of the airtightness detection device (1), a pressure relief valve (202) movable up and down is mounted on the axis of the connecting flange (201), one end of the pressure relief valve (202) is located inside the airtightness detection device (1), and the other end of the pressure relief valve (202) is located outside the airtightness detection device (1), a pressure relief hole (203) is provided on the pressure relief valve (202), and the pressure relief hole (203) cooperates with the airtightness detection device (1) to seal when the pressure relief valve (202) is within the pressure threshold; The constant pressure device (3) comprises a pressure rod (301), on which a downward pressing knob (302) is mounted. The downward pressing knob (302) is rotated so that the bottom of the pressure rod (301) applies pressure to the end of the pressure relief valve (202), thereby increasing the pressure resistance of the pressure relief valve (202).

2. The protective structure of the air tightness detection device for an instrument according to claim 1, characterized in that: The airtightness detection device (1) comprises an airtight cabinet (101), a sealing door is provided on the front of the airtight cabinet (101) so that the airtight cabinet (101) is sealed as a whole, and a device to be detected is placed inside the airtight cabinet (101); A pressurizing pipe (102) is installed on the side of the airtight cabinet (101), and high-pressure gas is injected into the interior of the airtight cabinet (101) through the pressurizing pipe (102). A pressure gauge (103) and a solenoid valve (104) are respectively installed on the pressurizing pipe (102). The pressure gauge (103) displays the internal air pressure of the airtight cabinet (101), and the solenoid valve (104) seals the pressurizing pipe (102).

3. The protective structure of the air tightness detection device for an instrument according to claim 2, characterized in that: An air pressure display gauge (105) is installed on the sealed door of the airtight cabinet (101), and the air pressure display gauge (105) displays the change of air pressure inside the airtight cabinet (101).

4. The protective structure of the air tightness detection device for an instrument according to claim 2, characterized in that: A support frame (106) is fixedly connected to the top of the airtight cabinet (101); the support frame (106) is arch-shaped and a through hole is opened at the axis of the support frame (106); the through hole is plugged into the pressure rod (301).

5. The protective structure of the air tightness detection device for an instrument according to claim 1, characterized in that: An elastic member (204) is sleeved on the outer surface of the pressure relief valve (202), and the elastic member (204) applies downward pressure to the pressure relief valve (202).

6. The protective structure of the air tightness detection device for an instrument according to claim 1, characterized in that: A positioning hole (205) is provided on the top of the pressure relief valve (202), and the positioning hole (205) limits the bottom of the pressure rod (301).

7. The protective structure of the air tightness detection device for an instrument according to claim 6, characterized in that: A pressure index gauge (303) is installed on the top of the pressure rod (301), and a pressure gauge contact pin (304) is arranged at the bottom of the pressure index gauge (303). The pressure gauge contact pin (304) extends to the bottom of the pressure rod (301) and overlaps with the inner bottom of the positioning hole (205).

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