Nitrogen and hydrogen gas tightness detection box

Abstract

The invention discloses a nitrogen and hydrogen detection air tightness detection box which comprises a bottom plate, a lower die and an upper die are sequentially arranged at the top of the bottom plate, a lower filler is arranged in the lower die, a to-be-detected product is clamped in the lower filler and is pressed down and fixed through the upper filler, and a lower sealing port of the to-be-detected product is sealed through a lower sealing plug. The nitrogen and hydrogen detection air tightness detection box is suitable for the technical field of nitrogen and hydrogen detection equipment, the nitrogen and hydrogen detection air tightness detection box is adopted, the leakage rate capturing precision is high, a thread screwing assembly process plug is not needed, then thread screwing assembly of the product is not needed, and the detection efficiency is high. The production efficiency is improved while the product quality requirement is met, the hand labor intensity of workers is reduced, the production period is shortened, and the cost of enterprises is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nitrogen and hydrogen detection equipment, in particular to a nitrogen and hydrogen air tightness detection box. Background Art

[0002] Nitrogen-hydrogen testing is a commonly used air-tightness testing method. Currently, manufacturing sites use industry pistol-type nitrogen-hydrogen testing instruments to quickly test the air-tightness of products, including upper and lower seals, and external cavities. Employees need to repeatedly tighten the threads in the assembly process, plug the plug, and then tighten the threads in the assembly product to test the air-tightness. This results in slow production efficiency and high manual labor intensity, affecting testing efficiency. Repeated thread installation can easily lead to the risk of scratches and bumps on the product, and the accuracy of leak detection using a hand-held gun is low. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a nitrogen-hydrogen air tightness detection box.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A nitrogen and hydrogen air tightness test box includes a bottom plate, a lower mold and an upper mold are sequentially provided on the top of the bottom plate, a lower filler is provided in the lower mold, a product to be tested is clamped in the lower filler and fixed by downward pressure of the upper filler, a lower sealing port of the product to be tested is sealed by a lower sealing plug, an outer cavity sealing port of the product to be tested is sealed by an outer cavity sealing plug, and an upper sealing port of the product to be tested is sealed by an upper sealing plug.

[0006] Preferably, the lower sealing plug includes a sealing cylinder, which is fixed to the side of the lower mold through a fixing rod. A cylinder slider is connected to the output rod of the sealing cylinder. The cylinder slider slides through the lower mold and the lower filler. A double-layer sealing ring is provided at the end of the cylinder slider away from the sealing cylinder, which is used to seal the lower sealing port of the product to be inspected.

[0007] Preferably, an air path is provided in the cylinder slider, the inner end of the air path is connected to the lower sealing port of the product to be inspected, and the outer end of the air path is connected to the lower sealing detection equipment for detecting the lower sealing performance of the product to be inspected.

[0008] Preferably, a fixing cavity is provided inside the lower filling and upper filling connection structure, and the fixing cavity is adapted to the structure of the product to be inspected. The product to be inspected is placed upside down and clamped in the fixing cavity, and is fixed by the lower filling and upper filling.

[0009] Preferably, the lower end of the lower mold is sealed to the bottom plate via a sealing ring, and the upper end of the lower mold is sealed to the upper mold via a sealing ring.

[0010] Preferably, the outer cavity sealing plug is arranged on the top of the bottom plate, and the outer cavity sealing plug is an inflation joint, and the inflation joint is clamped in the outer cavity sealing port of the product to be inspected.

[0011] Preferably, a cylinder is further provided on the outside of the lower mold, and the inflation joint is connected to the cylinder for vacuuming the outer cavity of the product to be tested. A detection hole is also provided on the inflation joint, which is connected to an external detection device for detecting the sealing performance of the outer cavity of the product to be tested.

[0012] Preferably, the upper sealing plug is provided at the bottom of the upper mold, the upper seal is a sealing plug, and the sealing plug passes through the upper filling and is clamped in the upper sealing port of the product to be tested.

[0013] Preferably, an upper sealing detection device is further provided in the sealing plug, and the upper sealing detection device is connected to the upper sealing port of the product to be tested through a channel.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] In the present invention, the nitrogen-hydrogen air tightness detection box is used to capture leakage with high accuracy, and there is no need to tighten the thread assembly process to plug the plug and then tighten the thread assembly product. While meeting product quality requirements, it improves production efficiency, reduces employee manual labor intensity, shortens the production cycle, and improves the company's cost advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 This is an enlarged view of the structure at point A of the present invention;

[0019] Figure 4 is an exploded view of the present invention;

[0020] Figure 5 It is a schematic diagram of the internal structure of the present invention.

[0021] Figure numerals: 1, base plate; 2, lower mold; 3, upper mold; 4, lower filling; 5, upper filling; 6, outer cavity sealing plug; 61, sealing cylinder; 62, cylinder slider; 7, upper sealing plug; 8, upper sealing plug. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below.

[0023] The "ranges" disclosed herein are defined in the form of lower and upper limits. A given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 10 to 50 is listed for a particular parameter, it is understood that ranges of 10 to 40 and 20 to 50 are also contemplated. Furthermore, if the minimum range values listed are 1 and 2, and if the maximum range values listed are 3, 4, and 5, then the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" is an abbreviation for any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 to 5" are listed herein, and "0 to 5" is simply an abbreviation for these numerical combinations.

[0024] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0025] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0026] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0027] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0028] Unless otherwise specified, the reaction is carried out at room temperature and pressure.

[0029] Unless otherwise specified, all parts or percentages are by weight.

[0030] In the present invention, all substances used are known substances and can be purchased or synthesized by known methods.

[0031] In the present invention, the devices or equipment used are all conventional devices or equipment known in the art and are commercially available.

[0032] The following examples further illustrate the specific implementation of the nitrogen and hydrogen air tightness detection box of the present invention. The nitrogen and hydrogen air tightness detection box of the present invention is not limited to the description of the following examples.

[0033] Example 1:

[0034] A nitrogen and hydrogen air tightness test box, such as Figure 1-5 As shown, it includes a base plate 1, a lower mold 2 and an upper mold 3 are sequentially provided on the top of the base plate 1, a lower filler 4 is provided in the lower mold 2, the product to be inspected is clamped in the lower filler 4 and is pressed down and fixed by the upper filler 5, the lower sealing port of the product to be inspected is sealed by the lower sealing plug 6, the outer cavity sealing port of the product to be inspected is sealed by the outer cavity sealing plug 8, and the upper sealing port of the product to be inspected is sealed by the upper sealing plug 7.

[0035] In one possible embodiment, the lower sealing plug 6 includes a sealing cylinder 61, which is fixed to the side of the lower mold 2 through a fixing rod. The output rod of the sealing cylinder 61 is connected to a cylinder slider 62, and the cylinder slider 62 slides through the lower mold 2 and the lower filler 4. A double-layer sealing ring is provided at the end of the cylinder slider 62 away from the sealing cylinder 61, which is used to seal the lower sealing port of the product to be inspected.

[0036] In one possible embodiment, an air path is provided in the cylinder slider 62 , the inner end of the air path is connected to the lower sealing port of the product to be inspected, and the outer end of the air path is connected to the lower sealing detection equipment for detecting the lower sealing performance of the product to be inspected.

[0037] In one possible embodiment, a fixing cavity is opened inside the connection structure of the lower filler 4 and the upper filler 5, and the fixing cavity is adapted to the structure of the product to be inspected. The product to be inspected is placed upside down and fixed in the fixing cavity, and is fixed by the lower filler 4 and the upper filler 5.

[0038] In a possible embodiment, the lower end of the lower mold 2 is sealed to the bottom plate 1 via a sealing ring, and the upper end of the lower mold 2 is sealed to the upper mold 3 via a sealing ring.

[0039] In a possible embodiment, the outer cavity sealing plug 8 is provided on the top of the base plate 1 , and the outer cavity sealing plug 8 is an inflation joint, which is clamped in the outer cavity sealing port of the product to be inspected.

[0040] In one possible embodiment, a cylinder is further provided on the outside of the lower mold 2, and an inflation joint is connected to the cylinder for vacuuming the outer cavity of the product to be tested. A detection hole is also provided on the inflation joint, which is connected to an external detection device for detecting the sealing performance of the outer cavity of the product to be tested.

[0041] In a possible embodiment, the upper sealing plug 7 is provided at the bottom of the upper mold 3 . The upper sealing plug 7 is a sealing plug that passes through the upper filler 5 and is clamped in the upper sealing port of the product to be tested.

[0042] In a possible implementation, an upper sealing detection device is further provided in the sealing plug, and the upper sealing detection device is connected to the upper sealing port of the product to be tested through a channel.

[0043] In one possible embodiment, the base plate 1, lower mold 2, lower filler 4, and inflation joint are fixed on the machine table, and the upper mold 3, upper filler 5, and upper sealing plug 7 are fixed on the top of the equipment. The downward force from the top of the equipment merges the upper and lower molds into an inner cavity to achieve a closed space to detect the airtightness of the product.

[0044] Furthermore, the product to be tested is loaded into the inner cavity of the lower filling 4, and the sealing ring of the inflation joint seals the product. After the upper mold and the lower mold are combined, the product is firmly fixed and the upper sealing plug 7 is directly inserted into the sealing detection hole on the product.

[0045] Furthermore, when testing the airtightness of the lower seal of the product to be tested, the cylinder slider 62 is pushed out to directly seal the lower sealing hole of the product, thereby testing the airtightness of the lower seal.

[0046] Furthermore, when testing the airtightness of the upper sealing part of the product to be tested, the upper sealing plug 7 plays a role in testing the airtightness of the upper sealing part.

[0047] Furthermore, when testing the air tightness of the outer cavity of the product to be tested, the air tightness of the outer cavity is tested from the testing hole on the outside of the inflation joint.

[0048] In one possible embodiment, the product to be tested is loaded into the lower filler 4, the upper mold 3, the upper filler 5, and the lower mold 2 is merged vertically downward, and the inflation joint pressurizes the product directly to the working state to test the upper seal, lower seal, and outer cavity airtightness.

[0049] By adopting the above technical solutions:

[0050] The equipment of the present application is convenient and quick to operate, reduces the labor intensity of the operator's watch, improves production efficiency, and solves the problems of low production efficiency, inconvenient installation, and large manual labor of the operator in traditional hand-gun nitrogen and hydrogen detection.

[0051] Working principle: Figure 1-5As shown, the product's valve stem is rocked to the lower sealing lock position, the lower sealing plug is installed, and the product is pressed into the mold cavity with the product nut facing downward. The equipment is started, and the upper mold is closed downward to seal the product's outer and inner cavities. Cylinder slider 62 is ejected, and the end sealing ring of the cylinder slider presses against the end face of the lower sealing plug with a hole (to accurately collect leaking gas from the product). The bottom plate's inflation connector evacuates the product's inner cavity to a negative pressure of 80 kPa. Nitrogen and hydrogen gas are then injected into the cavity to a pressure of 2.0 MPa. The cylinder slider is connected to an instrument via a pipe, which starts operating and collects leaks from the product's lower sealing gas, providing a leakage value. The upper mold plate evacuates the product's outer cavity to a negative pressure of 75 kPa. The outer cavity is connected to an instrument via a pipe, and the instrument starts operating to check for nitrogen and hydrogen gas leaks from the outer cavity, providing a leakage value. The product's valve stem is rocked to the upper sealing lock position. The testing principle is the same as above, except that the instrument connected to the inner cavity detection pipe is designed inside the upper sealing plug 1.

[0052] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A nitrogen and hydrogen air tightness detection box, characterized by: The invention comprises a bottom plate (1), a bottom die (2) and an upper die (3) are sequentially arranged on the top of the bottom plate (1), a lower filler (4) is arranged in the lower die (2), a product to be inspected is clamped in the lower filler (4) and is pressed down and fixed by an upper filler (5), a lower sealing port of the product to be inspected is sealed by a lower sealing plug (6), an outer cavity sealing port of the product to be inspected is sealed by an outer cavity sealing plug (8), and an upper sealing port of the product to be inspected is sealed by an upper sealing plug (7).

2. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: The lower sealing plug (6) includes a sealing cylinder (61), which is fixed to the side of the lower mold (2) through a fixing rod. The output rod of the sealing cylinder (61) is connected to a cylinder slider (62), and the cylinder slider (62) slides through the lower mold (2) and the lower filler (4). The end of the cylinder slider (62) away from the sealing cylinder (61) is provided with a double-layer sealing ring for sealing the lower sealing port of the product to be inspected.

3. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: An air passage is provided in the cylinder slider (62), the inner end of the air passage is connected to the lower sealing port of the product to be inspected, and the outer end of the air passage is connected to the lower sealing detection equipment for detecting the lower sealing performance of the product to be inspected.

4. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: A fixing cavity is provided inside the connection structure of the lower filling (4) and the upper filling (5), and the fixing cavity is adapted to the structure of the product to be inspected. The product to be inspected is placed upside down and fixed in the fixing cavity, and is fixed by the lower filling (4) and the upper filling (5).

5. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: The lower end of the lower mold (2) is sealed to the bottom plate (1) via a sealing ring, and the upper end of the lower mold (2) is sealed to the upper mold (3) via a sealing ring.

6. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: The outer cavity sealing plug (8) is arranged on the top of the bottom plate (1); the outer cavity sealing plug (8) is an inflation joint, and the inflation joint is clamped in the outer cavity sealing port of the product to be inspected.

7. The nitrogen and hydrogen air tightness detection box according to claim 6, characterized in that: A cylinder is also provided on the outside of the lower mold (2), and the inflation joint is connected to the cylinder and is used to evacuate the outer cavity of the product to be tested. A detection hole is also provided on the inflation joint and is connected to an external detection device for detecting the sealing performance of the outer cavity of the product to be tested.

8. The nitrogen and hydrogen air tightness detection box according to claim 1, characterized in that: The upper sealing plug (7) is arranged at the bottom of the upper mold (3). The upper sealing plug (7) is a sealing plug. The sealing plug passes through the upper filler (5) and is clamped in the upper sealing port of the product to be tested.

9. The nitrogen and hydrogen air tightness detection box according to claim 8, characterized in that: An upper sealing detection device is also provided in the sealing plug, and the upper sealing detection device is connected to the upper sealing port of the product to be tested through a channel.

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