CN217687701U - Tightness detection device - Google Patents

Abstract

The utility model relates to a leakproofness detection device, leakproofness detection device includes: the detection box is used for placing a workpiece to be detected; the analysis module, the analysis module includes the piece of taking out air, becomes appearance piece, analysis appearance, first valve, second valve, third valve and fourth valve, the detection case pass through the pipeline with the analysis appearance intercommunication, just the second valve with first valve set up in the detection case with between the analysis appearance, the piece of taking out air passes through the fourth valve communicate in the second valve with between the first valve, the varactor pass through the third valve communicate in the second valve with between the first valve, it is used for increasing or reducing self volume to become appearance piece. The tightness detection device is beneficial to improving the detection precision and the effectiveness of the detection result, and further improves the reliability of the tightness detection of the detected workpiece.

Description

Tightness detection device

Technical Field

The utility model relates to a leakproofness detects technical field, especially relates to a leakproofness detection device.

Background

Batteries, battery modules, power battery packs and the like are visible everywhere in life, are widely applied to equipment such as automobiles, mobile phones, earphones and the like, the safety of the batteries is more important along with the wide application of the batteries, and when the sealing performance of the batteries is defective, on one hand, substances such as external air, water vapor and the like easily invade the interior of the batteries to cause safety problems; on the other hand, gas generated inside the battery or electrolyte in the gas is easy to leak outwards, which causes safety problems. Therefore, the battery needs to be tested for sealing performance before shipment.

In the traditional technology, methods such as an air pressure attenuation method, a helium mass spectrometry method, a VOC (volatile organic compound) detection method, an artificial sniffing touch detection method and the like are commonly used for the sealing integrity of batteries, battery modules and power battery packs. The problems existing in the existing methods mainly include that tiny leakage cannot be detected, the influence of the residual volume of a battery pack of a battery module is easily caused, a leak hole of the battery cannot be detected after being blocked by electrolyte, and a VOC (volatile organic compound) detection method is easily interfered by gas volatilized by formaldehyde and glue in a working environment.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a device for detecting the sealing property, which can effectively improve the reliability of the sealing property detection of the workpiece to be detected. The utility model discloses a thereby whether the leakage that detects the battery pertinence and appear specific material leaks like electrolyte and judges the sealed integrality of battery.

The technical scheme is as follows: a tightness detection device comprising: the detection box is used for placing a workpiece to be detected; the analysis module, the analysis module includes the piece of taking out gas, becomes appearance piece, analysis appearance, first valve, second valve, third valve and fourth valve, the detection case pass through the pipeline with the analysis appearance intercommunication, just the second valve with first valve set up in the detection case with between the analysis appearance, the piece of taking out gas passes through the fourth valve communicate in the second valve with between the first valve, the varactor communicate through the third valve in the second valve with between the first valve, become appearance piece and be used for increasing or reducing self volume.

Above-mentioned leakproofness detection device, in the use, will be surveyed the work piece and place in the detection case, at first, close the second valve, open first valve, third valve, fourth valve, the varactor is in maximum volume position or is in and predetermines the position, starts the piece of taking out air for take out vacuum state in pipeline and each cavity with the pipeline intercommunication, take out air and the remaining gas of last time detection, prevent to disturb the testing result. After the vacuum environment is pumped, the fourth valve is closed, the second valve is opened, the pressure in the detection box is atmospheric pressure, the analysis module is vacuum, and therefore under the action of pressure difference, the gas containing the molecules to be detected in the detection box flows into the analysis module, most of the gas flows to the variable volume part, a small part of the gas enters the analyzer, the analyzer performs primary detection on the gas, and the signals of the detected molecules are weak. In order to strengthen the signal of the detected molecule, close the second valve, the varactor promotes to the direction that reduces the volume, along with the promotion of varactor volume sample jar, whole volume in the analysis module reduces, and gas concentration increases, and gas pressure also increases thereupon, will have more molecules flow to the analysis appearance of being detected this moment, and more signals are gathered to the analysis appearance this moment, are favorable to improving the validity of detecting precision and testing result, and then improve the reliability that is detected the work piece leakproofness and detects.

In one embodiment, the tightness detection device further comprises a blocking clamp, and the pipeline is in sealing fit with the detection box through the blocking clamp.

In one embodiment, the tightness testing device further comprises a fifth valve, and one end of the fifth valve is communicated between the testing box and the second valve through a pipeline.

In one embodiment, the other end of the fifth valve is used for communicating with a carrier gas device, and the carrier gas device is used for introducing carrier gas into the pipeline.

In one embodiment, the other end of the fifth valve is used for communicating with a vacuum pump.

In one embodiment, the displacement-changing member includes a sampling tank, a piston rod and a driving member, the sampling tank is communicated with the third valve through a pipeline, the piston is in sealing fit with the inner wall of the sampling tank, the piston rod is connected with the piston, the driving member is in driving connection with the piston rod, and the driving member drives the piston to perform piston movement in the sampling tank.

In one embodiment, the tightness detecting device further comprises a sixth valve, one end of the sixth valve extends into the detecting box through a pipeline for communicating with the detected workpiece, and the other end of the sixth valve is used for communicating with a target substance.

In one embodiment, the first valve, the second valve, the third valve and the fourth valve are all solenoid valves.

In one embodiment, the tightness detecting device further comprises a control member, and the first valve, the second valve, the third valve and the fourth valve are electrically connected to the control member.

In one embodiment, the air pumping part is a vacuum pump, and an air inlet end of the vacuum pump is communicated with the fourth valve through a pipeline.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.

Fig. 1 is a first schematic diagram illustrating the operation of the sealing performance testing apparatus according to an embodiment;

fig. 2 is a second schematic diagram of the operation of the tightness detection device in an embodiment.

Description of reference numerals:

100. a sealing performance detection device; 110. a detection box; 120. an analysis module; 121. an air extraction member; 122. a variable capacitance element; 123. an analyzer; 124. a first valve; 125. a second valve; 126. a third valve; 127. a fourth valve; 130. plugging the clamp; 140. a fifth valve; 150. a sixth valve; 200. and (5) testing the workpiece.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, fig. 1 shows a first working principle diagram of a sealing performance detecting device 100 according to an embodiment of the present invention, and an embodiment of the present invention provides a sealing performance detecting device 100, where the sealing performance detecting device 100 includes: the detection box 110, the detection box 110 is used for placing the workpiece 200 to be detected; the analysis module 120, the analysis module 120 includes an air pumping element 121, a volume-changing element 122, an analyzer 123, a first valve 124, a second valve 125, a third valve 126 and a fourth valve 127, the detection box 110 is communicated with the analyzer 123 through a pipeline, the second valve 125 and the first valve 124 are disposed between the detection box 110 and the analyzer 123, the air pumping element 121 is communicated between the second valve 125 and the first valve 124 through the fourth valve 127, the volume-changing element 122 is communicated between the second valve 125 and the first valve 124 through the third valve 126, and the volume-changing element 122 is used for increasing or decreasing the volume thereof.

In the use process of the tightness detection device 100, the detected workpiece 200 is placed in the detection box 110, first, the second valve 125 is closed, the first valve 124, the third valve 126 and the fourth valve 127 are opened, the variable volume part 122 is located at the maximum volume position or at the preset position, the air pumping part 121 is started, so that the pipeline and each cavity communicated with the pipeline are pumped into a vacuum state, air and residual air in the previous detection are pumped away, and the detection result is prevented from being interfered. After the vacuum environment is formed, the fourth valve 127 is closed, the second valve 125 is opened, the pressure in the detection box 110 is atmospheric pressure, and the analysis module 120 is vacuum, so that the gas containing the molecules to be detected in the detection box 110 flows into the analysis module 120 under the action of pressure difference, most of the gas flows to the variable volume part 122, a small part of the gas enters the analyzer 123, the analyzer 123 performs preliminary detection on the gas, and the signal of the detected molecules is weak. In order to enhance the signal of the detected molecule, the second valve 125 is closed, the variable volume part 122 is pushed in the direction of reducing the volume, along with the pushing of the variable volume sampling tank, the whole volume in the analysis module 120 is reduced, the gas concentration is increased, the gas pressure is increased, more detected molecules flow to the analyzer 123, and at the moment, the analyzer 123 collects more signals, which is beneficial to improving the detection precision and the validity of the detection result, and further improving the reliability of the tightness detection of the detected workpiece 200.

In addition, the sealing performance testing apparatus 100 can also be tested by the following operation scheme: before testing, the variable volume part 122 is in the minimum volume position, and the evacuation part 121 evacuates the analysis module 120 to evacuate the test environment. After the vacuum environment is pumped, the fourth valve 127 is closed, the second valve 125 is opened, and the variable volume element 122 is operated to increase its volume, so that the gas containing the molecules to be detected in the detection chamber 110 flows to the variable volume element 122 under the action of the pressure difference, and part of the gas flows to the analyzer 123 to be detected, at this time, the signal of the detected molecules is weak. Then, the second valve 125 is closed, the variable volume element 122 is operated to reduce the volume thereof, so that the overall volume in the test area is reduced, the gas concentration is increased, the gas pressure is increased, more detected molecules flow to the analyzer 123, and the analyzer 123 can acquire more signals, so that the detection result is more accurate. The capacitance varying element 122 functions as a signal multiplier for the analyte, and the detection is completed.

Because the analyzer 123 is not the utility model discloses an improve the object, consequently do not prescribe a limit to the concrete structure and the model of analyzer 123, only need satisfy the function that detects gas molecule can, for example, analyzer 123 is mass spectrum analyzer 123, VOC detector, thermal conductance formula gas analyzer 123, electrochemical formula gas analyzer 123, infrared absorption formula analyzer 123 etc..

In other embodiments, the tightness testing device 100 may not include the testing box 110 for a specific type of tested workpiece 200, and the pipe is directly connected to the tested workpiece 200 in a sealing manner.

In one embodiment, referring to fig. 1 and fig. 2, the tightness testing device 100 further includes a plugging fixture 130, and the pipeline is sealed and matched with the testing box 110 through the plugging fixture 130. So, be favorable to improving the leakproofness between the test environment, and then avoid gas leakage, guarantee the concentration of gaseous in the test environment, improve the reliability of test result.

In one embodiment, referring to fig. 1 and 2, the tightness testing device 100 further includes a fifth valve 140, and one end of the fifth valve 140 is connected between the testing box 110 and the second valve 125 through a pipe. Thus, the fifth valve 140 may serve as an interface for connecting to the carrier gas, for example, the other end of the fifth valve 140 is used for communicating with a carrier gas device, the carrier gas device is used for introducing the carrier gas into the pipeline, and the target substance to be detected in the detection box 110 may be transported to the detection area, such as helium. The carrier gas can also be used for cleaning the test box to clean the target substance remaining in the last detection, after the detection is finished, the fifth valve 140 is opened, the second valve 125 is closed, the carrier gas is filled in the detection box 110, and the vacuum degree of the detection box 110 can be broken while the residual gas is cleaned. The other end of the fifth valve 140 can also be used as an interface for connecting a vacuum pump, for example, for connecting the vacuum pump. When the vacuum pump is connected, a vacuum environment can be provided for the inspection box 110, so that the substance contained in the workpiece 200 to be inspected can be released into the vacuum environment of the inspection box 110 through the defect hole thereon, and thus can be detected by the analyzer 123. The other end of the fifth valve 140 may be used to discharge the target substance remaining in the detection chamber 110 when the vacuum pump is connected thereto. And may also serve as an exhaust port to assist in breaking the vacuum in the detection chamber 110.

Alternatively, the displacement volume 122 may be a displacement canister, a piston cylinder, or other variable volume structure.

In one embodiment, referring to fig. 1 and 2, the displacement-changing element 122 includes a sampling canister, a piston rod and a driving element, the sampling canister is communicated with the third valve 126 through a pipeline, the piston is in sealing fit with the inner wall of the sampling canister, the piston rod is connected with the piston, the driving element is in driving connection with the piston rod, and the driving element drives the piston to perform piston movement in the sampling canister. Therefore, the automatic control device is convenient to operate, high in reliability and beneficial to realizing automatic control, and further ensures the test efficiency. The present embodiment provides only a specific implementation of the variable-displacement component 122, but is not limited thereto.

Referring to fig. 2, fig. 2 shows a second schematic diagram of the tightness detection device 100 according to an embodiment of the present invention, in an embodiment, the tightness detection device 100 further includes a sixth valve 150, one end of the sixth valve 150 extends into the detection box 110 through a pipeline for communicating with the workpiece 200 to be detected, and the other end of the sixth valve 150 is used for communicating with the target substance. Therefore, when the detected workpiece 200 does not have the target substance detected by the analyzer 123, the target substance can be introduced into the detected workpiece 200 through the pipeline by opening and closing the sixth valve 150, and when the airtightness of the detected workpiece 200 is in failure, the target substance can leak and enter the detection box 110 so as to be detected by the analyzer 123, so that the airtightness detection device 100 can be compatible with the airtightness detection of more products only by changing the action logics of the air pumping part 121 and each valve.

The target substance may be a gas, a solid, or a liquid.

Alternatively, the first valve 124, the second valve 125, the third valve 126, the fourth valve 127, the fifth valve 140, and the sixth valve 150 may be manual valves, automatic valves, solenoid valves, pneumatic valves, or other valve types.

In one embodiment, the first valve 124, the second valve 125, the third valve 126, and the fourth valve 127 are all solenoid valves. Further, the fifth valve 140 and the sixth valve 150 are both solenoid valves. The tightness detection device 100 further includes a control member, and the first valve 124, the second valve 125, the third valve 126, and the fourth valve 127 are electrically connected to the control member. So, can control the solitary automatic switching of each valve through the control, and then be favorable to improving experimental operation convenience and test efficiency.

Alternatively, the suction member 121 may be a suction fan, vacuum pump or other suction device.

In one embodiment, the pumping element 121 is a vacuum pump, and the inlet end of the vacuum pump is connected to the fourth valve 127 through a pipe. Therefore, the power is high, the reliability is high, the vacuum of the detection environment can be guaranteed, and the reliability of the test is further improved. The present embodiment provides only one specific embodiment of the air sucking member 121, but not limited thereto.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A leak detection apparatus, characterized by comprising:

the detection box is used for placing a workpiece to be detected;

the analysis module, the analysis module includes the piece of taking out gas, becomes appearance piece, analysis appearance, first valve, second valve, third valve and fourth valve, the detection case pass through the pipeline with the analysis appearance intercommunication, just the second valve with first valve set up in the detection case with between the analysis appearance, the piece of taking out gas passes through the fourth valve communicate in the second valve with between the first valve, the varactor communicate through the third valve in the second valve with between the first valve, become appearance piece and be used for increasing or reducing self volume.

2. The leak detection device according to claim 1, further comprising a blocking jig by which the pipe is sealingly engaged with the detection box.

3. The leak testing apparatus according to claim 1, further comprising a fifth valve, one end of which is connected between the test chamber and the second valve through a pipe.

4. The tightness detection device according to claim 3, wherein the other end of the fifth valve is used for communicating with a carrier gas device, and the carrier gas device is used for introducing a carrier gas into the pipeline.

5. The tightness testing device of claim 3, wherein the other end of the fifth valve is used for communicating with a vacuum pump.

6. The leak tightness detection device according to claim 1, wherein the variable volume member comprises a sampling tank, a piston rod and a driving member, the sampling tank is communicated with the third valve through a pipeline, the piston is in sealing fit with the inner wall of the sampling tank, the piston rod is connected with the piston, the driving member is in driving connection with the piston rod, and the driving member drives the piston to perform piston movement in the sampling tank.

7. The tightness testing device according to claim 1, further comprising a sixth valve, wherein one end of the sixth valve extends into the testing box through a pipe for communicating with the tested workpiece, and the other end of the sixth valve is for communicating with a target substance.

8. The leak detection apparatus according to claim 1, wherein the first valve, the second valve, the third valve, and the fourth valve are all solenoid valves.

9. The leak detection device of claim 8, further comprising a control member, wherein the first valve, the second valve, the third valve, and the fourth valve are electrically connected to the control member.

10. The tightness detection device according to any one of claims 1 to 9, wherein the air-pumping member is a vacuum pump, and an air inlet end of the vacuum pump is communicated with the fourth valve through a pipeline.

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