Leak detection device and air tightness detection tool

Abstract

The utility model discloses a leak detection device and an air tightness detection tool, and the device comprises an inflation assembly, the air outlet end of which is used for plugging one air port of equipment to be subjected to leak detection, and inputting air into the equipment to be subjected to leak detection; the plugging assembly is used for plugging other air ports of the equipment to be subjected to leakage detection; the air tightness detection assembly is communicated with the air outlet end of the air inflation assembly; and the air tightness detection assembly is used for detecting air pressure change in the equipment to be subjected to leak detection. According to the utility model, all the air ports of the to-be-detected equipment are plugged through the inflation assembly and the plugging assembly, and then the inflation assembly inflates the detection gas into the to-be-detected equipment, so that the airtightness detection assembly determines whether leakage occurs according to the air pressure change in the to-be-detected equipment, thereby effectively improving the detection precision and efficiency and reducing the product rejection rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to test technical field especially relates to a leak detection device and air tightness detection frock. BACKGROUND

[0002] As a typical aluminum heat exchange equipment, the sealing performance of the parallel flow heat exchanger directly affects the production efficiency and product quality. The main structure of the parallel flow heat exchanger is composed of aluminum parallel flow flat tubes, and the main structure is also provided with two gas ports and a pipe inlet assembly made of copper-aluminum composite material corresponding to the gas ports.

[0003] Among them, the whole production process of the parallel flow heat exchanger adopts two-step welding process: first, the main structure is welded by using NOCOLOK flux (potassium fluoride and aluminum salt mixture) in a 600℃ nitrogen protection environment through a controllable atmosphere brazing furnace (CAB), the process dissolves the aluminum oxide film by melting the flux, and forms a high-quality weld by capillary action; then the pipe inlet assembly is welded to the gas port of the main structure by flux welding.

[0004] The pain points of the prior art are concentrated in the leak detection link: if it is not found whether the main structure leaks after the main structure is welded, once the pipe inlet assembly is welded to the gas port, if it is found that the main structure leaks at this time, the parallel flow heat exchanger cannot be high-temperature furnace again, because the pipe inlet assembly is easy to melt and damage in a high-temperature environment, resulting in the whole parallel flow heat exchanger being directly scrapped.

[0005] Therefore, it is urgent to develop a new leak detection device to improve the detection accuracy and efficiency of the main structure after welding under the premise of avoiding thermal damage, so as to improve the product qualification rate and reduce the product scrap rate. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of leak detection device and air tightness detection frock, to solve the detection accuracy and efficiency of leak detection device in prior art are low, leading to the problem of high product scrap rate.

[0007] The technical scheme of the utility model is a kind of leak detection device, comprising:

[0008] inflating assembly, the gas outlet end of the inflating assembly is used to block one of the gas ports of the equipment to be detected leakage, and input gas into the equipment to be detected leakage;

[0009] blocking assembly, the blocking assembly is used to block the remaining gas ports of the equipment to be detected leakage;

[0010] air tightness detection assembly, the air tightness detection assembly is communicated with the gas outlet end of the inflating assembly;The air tightness detection assembly is used to detect the change of air pressure in the equipment to be detected leakage.

[0011] Further, the inflating assembly comprises a first pushing member, a first connecting block and a first plugging head are sequentially arranged on a pushing end of the first pushing member, the first plugging head is a hollow structure, an outer surface of the first connecting block is provided with an air inlet pipe for connecting an inflating device, and the air inlet pipe is communicated with the first plugging head.

[0012] The first plugging head is used for closely fitting the corresponding air port of the equipment to be detected by positioning through an outer diameter.

[0013] Further, the first pushing member further comprises a first base provided with a first inclined platform, a first pin shaft, a first limiting sleeve, a first connecting rod, a second connecting rod, a first handle and a first pushing rod.

[0014] The first pin shaft and the first limiting sleeve are sequentially and spacedly arranged along an inclined direction of the first inclined platform from top to bottom, one end of the first connecting rod is hingedly connected with one end of the second connecting rod through the first pin shaft, the other end of the first connecting rod is connected with the first handle, the other end of the second connecting rod is connected with a starting end of the first pushing rod, and a terminal end of the first pushing rod is connected with the first connecting block after being inclined through the first limiting sleeve.

[0015] Further, the inflating assembly further comprises a first base, one end of the first base is provided with a second inclined platform, the second inclined platform is provided with the first base in an inclined manner, and an inclined direction of the second inclined platform is the same as that of the first inclined platform.

[0016] Further, the other end of the first base away from the second inclined platform is provided with a first positioning member, and the first positioning member is used for fixing the equipment to be detected.

[0017] Further, the plugging assembly comprises a second pushing member, a second plugging head is arranged on a pushing end of the second pushing member, and the second plugging head is used for plugging the corresponding air port of the equipment to be detected by positioning through an inner diameter.

[0018] Further, the second pushing member further comprises a second base provided with a third inclined platform, a second pin shaft, a second limiting sleeve, a third connecting rod, a fourth connecting rod, a second handle, a second pushing rod and a second connecting block.

[0019] The second pin shaft and the second limiting sleeve are sequentially and spacedly arranged along an inclined direction of the third inclined platform from top to bottom, one end of the third connecting rod is hingedly connected with one end of the fourth connecting rod through the second pin shaft, the other end of the third connecting rod is connected with the second handle, the other end of the fourth connecting rod is connected with a starting end of the second pushing rod, a terminal end of the second pushing rod is connected with the second connecting block after being inclined through the second limiting sleeve, and the second connecting block is connected with the second plugging head on the other side away from the second pushing rod.

[0020] Furthermore, the sealing assembly also includes a second base, one end of which is provided with a fourth tilting platform. The second base is tilted on the fourth tilting platform, and the tilting direction of the fourth tilting platform is the same as that of the third tilting platform.

[0021] Furthermore, a second positioning element is provided at the other end of the second base away from the fourth inclined platform, and the second positioning element is used to fix the leak detection device.

[0022] This utility model also proposes an airtightness testing fixture, which includes the leak detection device described above.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] This invention seals all air ports of the leak-testing device using an inflation component and a sealing component. Then, the inflation component fills the leak-testing device with test gas, allowing the airtightness testing component to determine whether a leak has occurred based on the pressure change inside the device. This effectively improves testing accuracy and efficiency and reduces product scrap rate. Attached Figure Description

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

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

[0027] Figure 1 This is a schematic diagram of the leak detection device proposed in this utility model for detecting a parallel flow heat exchanger.

[0028] Figure 2 for Figure 1 An enlarged schematic diagram of reference numeral A in the attached figure;

[0029] Figure 3 is an enlarged schematic view of reference sign B in Figure 1

[0030] Figure 4 is a structural schematic view of the inflating assembly provided by the utility model;

[0031] Figure 5 is a structural schematic view of the plugging assembly provided by the utility model;

[0032] Figure 6 is a schematic view of the parallel flow heat exchanger provided by the utility model;

[0033] Figure 7 is a sectional view of the inlet pipe assembly provided by the utility model.

[0034] Reference signs:

[0035] 10, inflating assembly;

[0036] 111, first pushing member; 112, first connecting block; 113, first plugging head; 1131, air outlet pipe; 114, inflating device; 115, air inlet pipe; 116, first base; 117, first inclined platform; 118, first pin shaft; 119, first limiting sleeve; 120, first connecting rod; 121, second connecting rod; 122, first handle; 123, first pushing rod; 124, first base; 125, second inclined platform; 126, first positioning member; 1261, first limiting member; 1262, first limiting groove; 1263, second limiting groove;

[0037] 20, plugging assembly;

[0038] 211, second pushing member; 212, second plugging head; 213, second base; 214, third inclined platform; 215, second pin shaft; 216, second limiting sleeve; 217, third connecting rod; 218, fourth connecting rod; 219, second handle; 220, second pushing rod; 221, second connecting block; 222, second base; 223, fourth inclined platform; 224, second positioning member; 2241, second limiting member; 2242, third limiting groove; 2243, fourth limiting groove;

[0039] 30, air tightness detection assembly;

[0040] 40, equipment to be detected; 410, flow collecting pipe; 411, parallel flow flat tube; 412, air port; 413, inlet pipe assembly; 4131, plugging head; 4132, copper pipe; 4133, heat shrinkable tube; 4134, aluminum pipe. DETAILED DESCRIPTION

[0041] ​In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the utility model, and it is not implied that each embodiment of the utility model must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the explained combination is not intended to be limiting.

[0042] The principle and structure of the utility model will be described in detail below in combination with the drawings and embodiments.

[0043] In some embodiments, as shown in Figure 1 The utility model provides a leak detection device, comprising:

[0044] The inflation assembly 10 is used for plugging one of the gas ports 412 of the device to be detected 40 and inputting gas into the device to be detected 40.

[0045] The plugging assembly 20 is used for plugging the remaining gas ports 412 of the device to be detected 40.

[0046] The airtightness detection assembly 30 is communicated with the gas outlet end of the inflation assembly 10, and the airtightness detection assembly 30 is used for detecting the change of gas pressure in the device to be detected 40.

[0047] It should be noted that, for the convenience of understanding, the device to be detected 40 proposed in the embodiment is exemplified by a parallel flow heat exchanger, and the main structure of the parallel flow heat exchanger is composed of a current collecting pipe 410 made of aluminum material and a parallel flow flat tube 411, and two gas ports 412 are further arranged on the current collecting pipe 410, and each gas port 412 is correspondingly and sealingly provided with an inlet pipe assembly 413 made of copper-aluminum composite material.

[0048] In some embodiments, as shown in Figures 6-7As shown, the whole production process of the parallel flow heat exchanger adopts two-step welding process: first, through the controlled atmosphere brazing furnace (CAB) at 600°C in a nitrogen protective environment, using NOCOLOK flux (potassium fluoride and aluminum salt mixture) to complete the welding of the main structure, this process dissolves the aluminum oxide film by melting the flux, and forms a high-quality weld by capillary action; then the inlet pipe assembly 413 is welded to the gas port 412 of the manifold 410 by flux welding. And if the inlet pipe assembly 413 is welded to the gas port 412 of the manifold 410, the main structure cannot be reheated again because the gas pipe assembly 413 includes a plug 4131 made of butyl rubber, a copper pipe 4132, a heat shrink tube 4133 made of cross-linked polyethylene, and an aluminum pipe 4134, and one end of the copper pipe 4132 is provided with a plug 4131, and the other end of the copper pipe 4132 is communicated with the aluminum pipe 4134 through the heat shrink tube 4133; therefore, the gas pipe assembly 413 is easily damaged by melting in a high temperature environment, resulting in the entire parallel flow heat exchanger being directly scrapped.

[0049] Therefore, when the parallel flow heat exchanger completes the welding of the main structure, it is necessary to detect whether the main structure will leak. The detection process is as follows:

[0050] First, seal one of the gas ports 412 with the plugging assembly 20 to ensure that the gas does not leak from the gas port 412; then seal the other gas port 412 with the inflation assembly 10 to ensure that the gas does not leak from the gas port 412; then the inflation assembly 10 inflates the detection gas into the parallel flow heat exchanger through the other gas port 412, so that the internal pressure of the parallel flow heat exchanger reaches a certain initial pressure; then according to the ideal gas law, the volume of air and the size of pressure in a given space are inversely related under constant temperature. At this time, the high-precision pressure sensor in the air tightness detection assembly 30 monitors the pressure change inside the parallel flow heat exchanger in real time. If the parallel flow heat exchanger leaks, the detection gas will escape from the leakage point, causing the air volume to decrease and the air pressure to drop below the safety threshold. If the parallel flow heat exchanger does not leak, the gas pressure inside will remain relatively stable within a specified time. Therefore, the air tightness detection assembly 30 transmits the pressure change data to the control unit, and the control unit determines whether the parallel flow heat exchanger leaks according to the pre-set pressure threshold, thereby determining whether the quality of the parallel flow heat exchanger is qualified.

[0051] If the quality of the parallel flow heat exchanger is unqualified, the unqualified parallel flow heat exchanger is marked, and then re-furnace is passed to carry out repair welding, and after repair and detection, the welding of the pipe inlet assembly 413 is carried out, so as to distinguish from the prior art main body structure welding after the furnace, the leakage cannot be effectively detected, and after the welding of the pipe inlet assembly is completed, the leakage is checked out, and the main body structure cannot be directly scrapped again after high-temperature furnace passing, the leakage detection device can effectively detect whether the parallel flow heat exchanger without welding the pipe inlet assembly 413 leaks, so as to improve detection precision and efficiency and reduce product scrap rate.

[0052] Therefore, the leakage detection device can effectively improve detection precision and efficiency and reduce product scrap rate.

[0053] Of course, if the gas port 412 of the parallel flow heat exchanger is three or more than three, the inflation assembly 10 only blocks one gas port 412, and the remaining gas ports 412 are blocked by the blocking assembly 20.

[0054] In some embodiments, as shown in Figure 2 The inflation assembly 10 comprises a first pushing piece 111, a first connecting block 112 and a first blocking head 113 are sequentially arranged on the pushing end of the first pushing piece 111, the first blocking head 113 is a hollow structure, an air inlet pipe 115 for connecting an inflation device 114 is arranged on the outer surface of the first connecting block 112, and the air inlet pipe 115 communicates with the first blocking head 113.

[0055] The first blocking head 113 is used for tightly fitting the corresponding gas port 412 of the to-be-leakage-detected equipment 40 through external diameter positioning.

[0056] It can be understood that the air inlet pipe 115 extends into the interior of the first connecting block 112 and communicates with the hollow structure of the first blocking head 113. The air inlet pipe 115 is connected with the inflation device 114 through an air pipe, and the air pipe passes through the air tightness detection assembly 30, so that the air tightness detection assembly 30 detects the air pressure change in the parallel flow heat exchanger through the air pipe. A cylindrical air outlet pipe 1131 is arranged in the middle of the side of the first blocking head 113 away from the first connecting block 112, and the air outlet pipe 1131 communicates with the air inlet pipe 115.

[0057] In this way, the user can push the first pusher 111 to move the first sealing head 113 toward the corresponding air port 412 until the first sealing head 113 is tightly fitted to the corresponding air port 412 through the outer diameter positioning. At this time, the hollow structure of the first sealing head 113 will be connected with the air port 412, so that the detection gas filled by the inflation device 114 passes through the air inlet pipe 115, the first sealing head 113 and the air port 412 in sequence and is filled into the leak detection device 40, so that the inside of the leak detection device 40 reaches a certain initial pressure in order to carry out subsequent detection steps.

[0058] Of course, in other embodiments (not shown in the figure), the inflation device 114 can be configured as one of the components of the airtightness detection component 30. When the airtightness detection component 30 is activated, the airtightness detection component 30 will control the inflation device 114 to inject detection gas into the parallel flow heat exchanger and detect the pressure change in the parallel flow heat exchanger at the same time.

[0059] It should be noted that, for ease of understanding of the outer diameter positioning, this embodiment provides specific parameters for the first sealing head 113 and the corresponding air port 412:

[0060] The air port 412 corresponding to the first sealing head 113 has an outer diameter of 13.5 mm and an inner diameter of 8.2 mm. The first sealing head 113 is cylindrical, with an outlet pipe 1131 having a diameter of 5 mm, but the overall diameter of the first sealing head 113 is 13.6 mm. This allows the outlet pipe 1131 to be aligned with and inserted into the air port 412, ensuring that the first sealing head 113 fits tightly against the inner diameter of the corresponding air port 412. In this way, the inflation assembly 10 can simultaneously seal the leak and inject detection gas into the device 40 to be tested. Of course, the specific parameters of the first sealing head 113 and the corresponding air port 412 can be selected to other values ​​depending on the actual situation, and are not limited here.

[0061] In some specific embodiments, to ensure that the first pusher 111 can push the first sealing head 113 to seal the corresponding air port 412, such as Figure 4 As shown, the first pusher 111 proposed in this embodiment further includes: a first base 116 with a first inclined platform 117, a first pin 118, a first limiting sleeve 119, a first connecting rod 120, a second connecting rod 121, a first handle 122, and a first push rod 123;

[0062] The first pin 118 and the first limiting sleeve 119 are distributed sequentially from top to bottom along the inclined direction of the first inclined platform 117; one end of the first connecting rod 120 is hinged to one end of the second connecting rod 121 through the first pin 118; the other end of the first connecting rod 120 is connected to the first handle 122, the other end of the second connecting rod 121 is connected to the beginning end of the first push rod 123, and the end of the first push rod 123 passes obliquely through the first limiting sleeve 119 and is connected to the first connecting block 112.

[0063] It should be noted that the end of the first push rod 123 is provided with an external thread so that the end of the first push rod 123 can be threadedly connected to the first connecting block 112, so that when the first sealing head 113 is damaged, a new first sealing head 113 can be replaced more quickly. The function of the first limiting sleeve 119 is to ensure that the first push rod 123 moves along a fixed path and does not deviate. The function of the first connecting rod 120 and the second connecting rod 121, which are hinged by the first pin 118, is to convert the rotational motion of the first handle 122 into linear motion or motion in a specific direction, and to change the magnitude and direction of the force during the conversion. The first connecting block 112 serves to connect the first push rod 123 and the first sealing head 113, ensuring the transmission of force and the fixation of the relative positions between the components, so as to make the structure of the entire inflation assembly 10 stable.

[0064] In this way, when the user pulls the first handle 122 upward, the first handle 122 drives the first connecting rod 120 to rotate counterclockwise relative to the first pin 118, thereby driving the second connecting rod 121 to move away from the first pin 118. Then, the second connecting rod 121 drives the first push rod 123 and the first sealing head 113 located at the end of the first push rod 123 to move away from the first pin 118, that is, the first sealing head 113 moves towards the corresponding air port 412 so that the first sealing head 113 can accurately and tightly fit the corresponding air port 412.

[0065] In some specific embodiments, to ensure that the first sealing head 113 can more accurately and tightly fit the corresponding air port 412, such as Figure 4 As shown, the inflation assembly 10 also includes a first base 124, and a second inclined platform 125 is provided at one end of the first base 124 along the length direction. A first base 116 is inclined on the second inclined platform 125, and the inclination direction of the second inclined platform 125 is the same as the inclination direction of the first inclined platform 117.

[0066] Because the air port 412 is located on the curved surface of the leak detection device 40, the first push rod 123 and the first sealing head 113 need to be tilted so that they can fit more accurately and tightly with the corresponding air port 412.

[0067] In some specific embodiments, to prevent the gas port 412 of the device 40 under test from being axially displaced or radially deflected from the first plug 113 during the detection process, as shown in Figure 2 the first base 124 is provided with a first positioning member 126 at the other end away from the second inclined platform 125, and the first positioning member 126 is used to fix the device 40 under test.

[0068] Specifically, as shown in Figure 4 the first positioning member 126 is provided with a first limiting member 1261 at each end along the width direction of the first base 124, and all the first limiting members 1261 are respectively provided with a first limiting groove 1262 along the width direction of the first base 124, and the two first limiting grooves 1262 are on the same horizontal line, and the first limiting groove 1262 is used to limit the flow collecting pipe 410 arranged along the width direction of the first base 124; and all the first limiting members 1261 are respectively provided with a second limiting groove 1263 along the length direction of the first base 124, and the two second limiting grooves 1263 are parallel, and the second limiting groove 1263 is used to limit the parallel flow flat tube 411 arranged along the length direction of the first base 124, so as to correspond the gas port 412 to the first plug 113, so that when the first plug 113 moves to the corresponding gas port 412, it can tightly fit the corresponding gas port 412, and the first plug 113 and the corresponding gas port 412 will not be misaligned.

[0069] In some embodiments, as shown in Figure 3 the plug assembly 20 includes a second pushing member 211, and the pushing end of the second pushing member 211 is provided with a second plug 212, and the second plug 212 is used to position and plug the corresponding gas port 412 of the device 40 under test through the inner diameter.

[0070] In this way, the user pushes the second pushing member 211 to drive the second plug 212 to move towards the corresponding gas port 412, until the second plug 212 tightly fits the corresponding gas port 412 through the inner diameter positioning, so as to prevent the detection gas in the device 40 under test from leaking from the gas port 412 corresponding to the second plug 212, so as to perform the subsequent detection step.

[0071] It should be noted that, in order to facilitate the understanding of the inner diameter positioning, the specific parameters of the second plug 212 and the corresponding gas port 412 are proposed in this embodiment:

[0072] The gas port 412 corresponding to the second plug 212 has a size specification of an outer diameter of 13.5 mm and an inner diameter of 9.7 mm; and the second plug 212 is in a cylindrical shape, and the diameter of the entire second plug 212 is 10 mm, so that when the second plug 212 blocks the corresponding gas port 412, the entire second plug 212 is tightly fitted with the inner diameter of the gas port 412 to form an effective seal to prevent gas leakage. Of course, the specific parameters of the second plug 212 and the corresponding gas port 412 can also be selected as other values according to actual conditions, which are not limited here.

[0073] In some specific embodiments, to ensure that the second pusher 211 can push the second plug 212 to block the corresponding gas port 412, as shown, the second pusher 211 proposed in the embodiment also includes a second base 213 provided with a third inclined platform 214, a second pin shaft 215, a second limiting sleeve 216, a third connecting rod 217, a fourth connecting rod 218, a second handle 219, a second push rod 220, and a second connecting block 221. Figure 5

[0074] The second pin shaft 215 and the second limiting sleeve 216 are sequentially and spacedly distributed along the inclined direction of the third inclined platform 214 from top to bottom; one end of the third connecting rod 217 is hingedly connected to one end of the fourth connecting rod 218 through the second pin shaft 215; the other end of the third connecting rod 217 is connected to the second handle 219, the other end of the fourth connecting rod 218 is connected to the initial end of the second push rod 220, the terminal end of the second push rod 220 is connected to the second connecting block 221 after being obliquely passed through the second limiting sleeve 216, and the other side of the second connecting block 221 opposite to the second push rod 220 is connected to the second plug 212.

[0075] It should be noted that the terminal end of the second push rod 220 is provided with external threads, so that the terminal end of the second push rod 220 is threadedly connected to the second connecting block 221, so that when the second plug 212 is damaged, a new second plug 212 can be replaced more quickly. The second limiting sleeve 216 functions to ensure that the second push rod 220 moves along a fixed path and cannot deviate; the third connecting rod 217 and the fourth connecting rod 218 hingedly connected through the second pin shaft 215 function to convert the rotary motion of the second handle 219 into linear motion or motion in a specific direction, and change the size and direction of the force in the conversion process; the second connecting block 221 functions to connect the second push rod 220 and the second plug 212, to ensure the transmission of the force and the relative position between the components, and to stabilize the structure of the entire blocking assembly 20.

[0076] ​In this way, when the user pulls the second handle 219 upward, the second handle 219 drives the third link 217 to rotate counterclockwise relative to the second pin 215, thereby driving the fourth link 218 to move away from the second pin 215. Then, the fourth link 218 drives the second push rod 220 and the second sealing head 212 located at the end of the second push rod 220 to move away from the second pin 215, that is, the second sealing head 212 moves towards the corresponding air port 412 so that the second sealing head 212 can accurately and tightly fit the corresponding air port 412.

[0077] In some specific embodiments, to ensure that the second sealing head 212 can more accurately and tightly fit the corresponding air port 412, such as Figure 5 As shown, the sealing assembly 20 also includes a second base 222. One end of the second base 222 along the length direction is provided with a fourth inclined platform 223. A second base 213 is inclined on the fourth inclined platform 223. The inclination direction of the fourth inclined platform 223 is the same as the inclination direction of the third inclined platform 214.

[0078] Because the air port 412 is located on the curved surface of the leak detection device 40, the second push rod 220 and the second sealing head 212 need to be tilted so that they can fit more accurately and tightly with the corresponding air port 412.

[0079] In some specific embodiments, to prevent the air port 412 of the leak detection device 40 from undergoing axial displacement or radial deflection with the second sealing head 212 during the detection process, such as... Figure 3 As shown, the second base 222 is provided with a second positioning member 224 at the other end away from the fourth inclined platform 223. The second positioning member 224 is used to fix the leak detection device 40.

[0080] Specifically, such as Figure 5 As shown, the second positioning member 224 has a second limiting member 2241 at each end along the width direction of the second base 222, and all the second limiting members 2241 have a third limiting groove 2242 along the width direction of the second base 222. The two third limiting grooves 2242 are on the same horizontal line. The third limiting groove 2242 is used to limit the manifold 410 arranged along the width direction of the second base 222. All the second limiting members 2241 have a fourth limiting groove 2243 along the length direction of the second base 222. The two fourth limiting grooves 2243 are parallel. The fourth limiting groove 2243 is used to limit the parallel flow flat tube 411 arranged along the length direction of the second base 222, so that the corresponding air port 412 corresponds to the second sealing head 212, so that when the second sealing head 212 moves to the corresponding air port 412, it can fit tightly with the corresponding air port 412 and will not misalign with the second sealing head 212 and the corresponding air port 412.

[0081] In some embodiments, the utility model further proposes a gas tightness detection tool, the gas tightness detection tool includes above-mentioned leak detection device.

[0082] Therefore, the utility model discloses a gas tightness detection tool through the inflation assembly 10 and the plugging assembly 20 plugging all gas ports of the equipment 40 to be detected, then the inflation assembly 10 fills the detection gas to the equipment 40 to be detected, so that the gas tightness detection assembly 30 determines whether the leakage occurs according to the air pressure variation in the equipment 40 to be detected, which can effectively improve the detection precision and efficiency, and reduce the product rejection rate.

[0083] Among them, the use flow of the whole gas tightness detection tool is as follows:

[0084] First, the inflation assembly 10 and the plugging assembly 20 are stably placed on the operation table top, ensure that the inflation assembly 10 and the plugging assembly 20 are in the horizontal and stable state.

[0085] Then, the corresponding position of the equipment 40 to be detected (preferably parallel flow heat exchanger) is stably placed on the first positioning piece 126 and the second positioning piece 224.

[0086] Secondly, the power supply of the gas tightness detection assembly 30 and the inflation device 114 is connected, so that the inflation device 114 fills the appropriate detection gas into the parallel flow heat exchanger according to the preset program, and then the pressure change in the parallel flow heat exchanger is continuously monitored through the gas tightness detection assembly 30. Finally, according to the pressure data fed back by the gas tightness detection assembly 30, it is judged whether the parallel flow heat exchanger exists leakage. If the pressure remains stable within the specified time, it shows that the product is qualified, if the pressure drops below the safety threshold, it is determined that the product exists leakage, and the unqualified product is marked for subsequent re-furnace to carry out repair welding treatment.

[0087] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, not all the embodiments, and the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model. The utility model can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or make equivalent replacement to part of the technical features. Any equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection range of the utility model.

Claims

1. A leak detection device, characterized in that, include: An inflation assembly (10) is provided, the air outlet of which is used to block one of the air ports of the leak detection device (40) and to input gas into the leak detection device (40). A plugging assembly (20) is used to plug the remaining air ports of the leak detection device (40); An air tightness detection component (30) is connected to the air outlet of the inflation component (10); the air tightness detection component (30) is used to detect the air pressure change inside the leak detection device (40).

2. The leak detection device according to claim 1, characterized in that, The inflation assembly (10) includes: a first pusher (111), the pusher end of the first pusher (111) is provided with a first connecting block (112) and a first sealing head (113) in sequence, the first sealing head (113) is a hollow structure, the outer surface of the first connecting block (112) is provided with an air inlet pipe (115) for connecting the inflation device (114), the air inlet pipe (115) is connected to the first sealing head (113); The first sealing head (113) is used to fit tightly against the corresponding air port of the leak detection device (40) by positioning its outer diameter.

3. The leak detection device according to claim 2, characterized in that, The first pusher (111) also includes: a first base (116) with a first inclined platform (117), a first pin (118), a first limiting sleeve (119), a first connecting rod (120), a second connecting rod (121), a first handle (122), and a first push rod (123); The first pin (118) and the first limiting sleeve (119) are distributed sequentially from top to bottom along the inclination direction of the first inclined platform (117); one end of the first connecting rod (120) is hinged to one end of the second connecting rod (121) through the first pin (118); the other end of the first connecting rod (120) is connected to the first handle (122), the other end of the second connecting rod (121) is connected to the beginning end of the first push rod (123), and the end of the first push rod (123) passes obliquely through the first limiting sleeve (119) and is connected to the first connecting block (112).

4. The leak detection device according to claim 3, characterized in that, The inflation assembly (10) further includes a first base (124), one end of which is provided with a second inclined platform (125), and a first base (116) is inclined on the second inclined platform (125), the inclination direction of the second inclined platform (125) being the same as the inclination direction of the first inclined platform (117).

5. The leak detection device according to claim 4, characterized in that, The first base (124) is provided with a first positioning member (126) at the other end away from the second inclined platform (125), and the first positioning member (126) is used to fix the leak detection device (40).

6. The leak detection device according to claim 1, characterized in that, The sealing assembly (20) includes: a second pusher (211), the pusher end of the second pusher (211) is provided with a second sealing head (212), the second sealing head (212) is used to seal the corresponding air port of the leak detection device (40) by positioning through the inner diameter.

7. The leak detection device according to claim 6, characterized in that, The second pusher (211) also includes: a second base (213) with a third inclined platform (214), a second pin (215), a second limiting sleeve (216), a third connecting rod (217), a fourth connecting rod (218), a second handle (219), a second push rod (220), and a second connecting block (221); The second pin (215) and the second limiting sleeve (216) are distributed sequentially from top to bottom along the inclination direction of the third inclined platform (214); one end of the third connecting rod (217) is hinged to one end of the fourth connecting rod (218) through the second pin (215); the other end of the third connecting rod (217) is connected to the second handle (219), the other end of the fourth connecting rod (218) is connected to the beginning of the second push rod (220), the end of the second push rod (220) is inclined through the second limiting sleeve (216) and then connected to the second connecting block (221), and the second connecting block (221) is connected to the second sealing head (212) on the other side away from the second push rod (220).

8. The leak detection device according to claim 7, characterized in that, The sealing assembly (20) further includes a second base (222), one end of which is provided with a fourth inclined platform (223), and a second base (213) is inclined on the fourth inclined platform (223), the inclination direction of the fourth inclined platform (223) being the same as the inclination direction of the third inclined platform (214).

9. The leak detection device according to claim 8, characterized in that, The second base (222) is provided with a second positioning member (224) at the other end away from the fourth inclined platform (223), and the second positioning member (224) is used to fix the leak detection device (40).

10. An airtightness testing fixture, characterized in that, The airtightness testing fixture includes the leak detection device as described in any one of claims 1-9.

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