Leak detector

Abstract

The present application discloses a leak detector, including a leak detector body and a lifting part, wherein the lifting part is connected to the leak detector body, and the leak detector body can be moved by lifting the lifting part; the leak detector body includes a sound pickup sensor, a mounting seat and a counterweight part, wherein the sound pickup sensor is mounted on the mounting seat, and the counterweight part is closely connected to the mounting seat, and the counterweight part and the mounting seat are made of different materials, and the resonant frequency of the counterweight part is outside the detection frequency range of the leak detector, and when the leak detector body is placed on the surface to be measured, the counterweight part is located on the side where the sound pickup sensor is close to the surface to be measured, and the counterweight part is located on the side where the mounting seat is close to the surface to be measured; the counterweight part transmits the sound vibration from the surface to be measured to the mounting seat and the sound pickup sensor in sequence. The above scheme can solve the problem that the leak detector involved in the related art is easy to tip over after being placed on the surface to be measured.

Description

Technical Field

[0001] The present application belongs to the technical field of leak detection instruments, and in particular relates to a leak detection instrument. Background Art

[0002] With the development of urban planning, more and more pipelines are buried under the ground. Some of these pipelines are used to transport liquids (such as tap water and sewage). In the actual working process, when the infusion pipeline is damaged (such as cracks), it will leak. However, since these infusion pipelines are buried under the ground, they are difficult to be discovered in time, so it is easy to cause major accidents. In order to detect leakage as early as possible, more and more construction parties, security inspection parties, etc. use leak detectors to check whether the infusion pipelines under the ground are leaking.

[0003] During the leakage process, liquid dripping will occur, and the liquid dripping will generate vibrations that are then transmitted to the leak detector on the ground and then detected by the leak detector. The stable placement of the leak detector on the ground is an important factor in improving its detection effect. However, the leak detector involved in the related art is more likely to tip over after being placed on the ground. Obviously, this is not conducive to the stable detection work of the leak detector. Of course, the leak detector can also detect other types of test surfaces, not limited to the ground. The above problems also exist when detecting other test surfaces. Summary of the invention

[0004] The invention discloses a leak detector to solve the problem that the leak detector involved in the related art is easy to tip over after being placed on a surface to be tested.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] The embodiment of the present invention discloses a leak detector, comprising a leak detector body and a lifting part, wherein the lifting part is connected to the leak detector body, and the leak detector body can be moved by lifting the lifting part.

[0007] The leak detector body comprises a sound pickup sensor, a mounting seat and a counterweight, wherein the sound pickup sensor is mounted on the mounting seat, the counterweight is closely connected to the mounting seat, the counterweight is made of different materials from the mounting seat, and the resonance frequency of the counterweight is outside the detection frequency range of the leak detector.

[0008] When the leak detector body is placed on the surface to be measured, the counterweight portion is located on the side of the sound pickup sensor close to the surface to be measured, and the counterweight portion is located on the side of the mounting base close to the surface to be measured; the counterweight portion transmits the sound vibration from the surface to be measured to the mounting base and the sound pickup sensor in sequence.

[0009] The technical solution adopted by the present invention can achieve the following technical effects:

[0010] The leak detector disclosed in the embodiment of the present application improves the structure of the leak detector involved in the related art. By setting a counterweight part, the center of gravity of the leak detector body can be lowered, so that it can be parked more stably on the measured surface, which is convenient for the operator to place the leak detector body on the measured surface more stably through the lifting part. At the same time, the counterweight part is closely connected to the mounting seat, and when the leak detector body is placed on the measured surface, the counterweight part is located on the side of the mounting seat close to the measured surface, and the counterweight part is located on the side of the sound pickup sensor close to the measured surface, so that the center of gravity of the leak detector body is lower, so that it can be placed on the measured surface in a tighter contact manner, which is more conducive to the sound vibration from the measured surface passing through the counterweight part and the mounting seat in turn, and finally transmitted to the sound pickup sensor, which is conducive to improving the leak detection effect.

[0011] At the same time, since the resonance frequency of the counterweight part is outside the detection frequency range of the leak detector, the resonance frequency of the counterweight part is not equal to the resonance frequency of the sound corresponding to the detection frequency range of the leak detector. Therefore, the resonance of the counterweight part can be avoided, and the sound pickup sensor can be avoided from being disturbed by the resonance of the counterweight part, thereby improving the leak detection accuracy of the leak detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the exploded structure of the leak detector disclosed in the embodiment of the present invention;

[0013] Figure 2 It is a schematic diagram of the assembly of the leak detector disclosed in the embodiment of the present invention;

[0014] Figure 3 It is a schematic diagram of assembling the counterweight part and the supporting protrusion disclosed in the embodiment of the present invention;

[0015] Figure 4 It is an assembly schematic diagram of another leak detection instrument disclosed in an embodiment of the present invention.

[0016] Description of reference numerals:

[0017] 100-leakage detector body, 110-sound pickup sensor, 120-mounting seat, 121-mounting slot, 130-weight portion, 131-first close-fitting surface, 132-first connecting hole, 133-second connecting hole, 140-first threaded connector, 150-support protrusion, 160-cover, 170-pin, 180-electrical connector;

[0018] 200-lifting part;

[0019] 300-Measured surface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The technical solutions disclosed in various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Please refer to Figures 1 to 4 , an embodiment of the present invention discloses a leak detector. The disclosed leak detector is used to be placed on a test surface 300 to detect whether a pipe in the test surface 300 is leaking. The disclosed leak detector includes a leak detector body 100 and a lifting portion 200, and the lifting portion 200 is connected to the leak detector body 100. The leak detector body 100 can be moved by lifting the lifting portion 200, thereby realizing the movement of the entire leak detector. During specific use, the operator holds the lifting portion 200 to lift and move the leak detector body 100, and finally can adjust the position of the leak detector body 100 to perform subsequent leak detection.

[0023] The main body 100 of the leak detector is the main part of the leak detector and includes a sound pickup sensor 110 , a mounting seat 120 and a weight portion 130 .

[0024] The sound pickup sensor 110 can sense the sound vibration generated by the leakage, thereby achieving the purpose of detection. The mounting seat 120 is the base of the leak detector body 100, and can provide a mounting base for the sound pickup sensor 110 and the counterweight 130. Specifically, the sound pickup sensor 110 is mounted on the mounting seat 120, and the counterweight 130 is mounted on the mounting seat 120. The counterweight 130 is closely connected to the mounting seat 120, which is conducive to the sound vibration being better transmitted to the mounting seat 120 through the counterweight 130 during the detection process.

[0025] In the embodiment of the present application, the counterweight 130 at least performs a counterweight function, and the counterweight 130 is preferably made of a material with a relatively high density (comparable to the mounting base 120). Specifically, the counterweight 130 and the mounting base 120 are made of different materials, and the resonance frequency of the counterweight 130 is outside the detection frequency range of the leak detector. Since the leak detector detects the sound vibration generated by the infusion pipeline when leaking, the resonance frequency of the counterweight 130 is outside the detection frequency range of the leak detector, which means that the resonance frequency of the counterweight 130 is at least not equal to the resonance frequency of the corresponding sound within the detection frequency range.

[0026] It should be noted that, in this article, the detection frequency range of the leak detector can be the frequency range of sound vibrations that the leak detector is nominally able to detect, the frequency range of sound vibrations that the leak detector is rated for, or the frequency range of sound vibrations that the leak detector can detect in actual work.

[0027] In the specific detection process, the leak detector body 100 needs to be placed on the detected surface 300. Specifically, the detected surface 300 can be the ground to be detected, or it can be the vertical upward surface of the roof where the infusion pipeline is buried. The leak detector involved in this article can be placed on the detected surface 300 by the staff through the lifting part 200, and the leak detector body 100 can stay on the detected surface 300 under the action of its own gravity.

[0028] When the leak detector body 100 is placed on the measured surface 300, the counterweight portion 130 is located on the side of the sound pickup sensor 110 close to the measured surface 300. It can be understood that the counterweight portion 130 is located below the sound pickup sensor 110. For example, the counterweight portion 130 is located directly below or obliquely below the sound pickup sensor 110, and the counterweight portion 130 is located on the side of the mounting base 120 close to the measured surface 300, so that the counterweight portion 130 is installed on the side of the mounting base 120 that is closer to the measured surface 300, which is beneficial to make the center of gravity of the counterweight portion 130 lower.

[0029] In the specific working process, when the leak detector body 100 is placed on the detected surface 300, the sound vibration is transmitted from the detected surface 300 to the counterweight 130, and then transmitted to the mounting seat 120 and the sound pickup sensor 110 in sequence through the counterweight 130, and finally received by the sound pickup sensor 110, and finally the purpose of detection is achieved. As mentioned above, the counterweight 130 and the mounting seat 120 are made of different materials, and the resonance frequency of the counterweight 130 is outside the detection frequency range of the leak detector. Therefore, during the transmission of sound vibration, the resonance frequency of the counterweight 130 is not equal to the resonance frequency of the sound, so that resonance can be avoided to interfere with the detection of the sound pickup sensor 110.

[0030] The leak detector disclosed in the embodiment of the present application improves the structure of the leak detector involved in the related art. By providing the counterweight part 130, the center of gravity of the leak detector body 100 can be lowered, so that it can be parked more stably on the measured surface 300, making it convenient for the operator to place the leak detector body 100 more stably on the measured surface 300 through the lifting part 200. At the same time, the counterweight part 130 is tightly connected to the mounting seat 120, and when the leak detector body 100 is placed on the measured surface 300, the counterweight part 130 is located on the side of the mounting seat 120 close to the measured surface 300, and the counterweight part 130 is located on the side of the sound pickup sensor 110 close to the measured surface 300, thereby making the center of gravity of the leak detector body 100 lower, so that it can be placed on the measured surface 300 in a tighter contact manner, which is more conducive to the sound vibration from the measured surface 300 passing through the counterweight part 130 and the mounting seat 120 in sequence, and finally transmitted to the sound pickup sensor 110, which is beneficial to improve the leak detection effect.

[0031] At the same time, since the resonance frequency of the counterweight part 130 is outside the detection frequency range of the leak detector, the resonance frequency of the counterweight part 130 is not equal to the resonance frequency of the sound corresponding to the detection frequency range of the leak detector. Therefore, the resonance of the counterweight part 130 can be avoided, and the sound pickup sensor 110 can be avoided from being disturbed by the resonance of the counterweight part 130, thereby improving the leak detection accuracy of the leak detector.

[0032] As described above, the counterweight part 130 is closely connected with the mounting seat 120, which is beneficial to the conduction of sound vibrations and further to the improvement of the sound leakage detection effect. Based on this, in a preferred solution, the counterweight part 130 can be a plate-like structural member and has a first close-fitting surface 131, the mounting seat 120 has a second close-fitting surface, the counterweight part 130 is tightly connected with the mounting seat 120, and the first close-fitting surface 131 is tightly matched with the second close-fitting surface. It should be noted that the first close-fitting surface 131 is the plate surface of the plate-like structural member facing the second close-fitting surface. In this preferred solution, since the counterweight part 130 is a plate-like structural member and the first close-fitting surface 131 is a plate surface of the plate-like structural member, the first close-fitting surface 131 can have a larger fitting area with the mounting seat 120, and then when the counterweight part 130 is tightly connected with the mounting seat 120, the close fitting effect of the counterweight part 130 and the mounting seat 120 can be improved, which is ultimately beneficial to the improvement of the sound vibration transmission.

[0033] Specifically, there are many ways to achieve the fastening connection between the counterweight part 130 and the mounting seat 120. For example, the counterweight part 130 and the mounting seat 120 can be fixedly connected by rivets, super glue, etc. Of course, the counterweight part 130 and the mounting seat 120 can also be fastened in other ways. In an optional solution, the counterweight part 130 and the mounting seat 120 are fastened by multiple first threaded connectors 140 distributed at intervals. Specifically, the first threaded connector 140 can be a first screw. The fastening connection using multiple first threaded connectors 140 distributed at intervals can facilitate the disassembly and assembly operations, and the interval distribution can better ensure the fastening connection strength at multiple positions.

[0034] In order to better ensure the balance of the connection, the plurality of first threaded connectors 140 are evenly distributed around the central axis of the counterweight 130 and the central axis of the mounting seat 120, and the central axis of the counterweight 130 and the central axis of the mounting seat 120 both coincide with the central axis of the leak detector body 100. In this case, the first threaded connectors 140 and the parts fastened by the first threaded connectors 140 are distributed more evenly, which can improve the fastness of the connection between the counterweight 130 and the mounting seat 120. Specifically, the counterweight 130 is provided with a first connection hole 132, and the first threaded connector 140 cooperates with the first connection hole 132 and the corresponding third connection hole on the mounting seat 120, thereby realizing the fastening connection between the counterweight 130 and the mounting seat 120.

[0035] In one embodiment, the mounting seat 120 may also be a plate-shaped structural member, and the mounting seat 120 and the counterweight portion 130 are overlapped and fastened. In this case, the mounting seat 120 and the counterweight portion 130 are similar to two plates attached together and fastened. This method has the advantage of a simple structure.

[0036] In other embodiments, the mounting seat 120 may be provided with a mounting groove 121, and when the leak detector body 100 is placed on the measured surface 300, the notch of the mounting groove 121 faces the measured surface 300. For example, when the measured surface 300 is a horizontal ground, the notch of the mounting groove 121 may face vertically downward. The counterweight 130 is at least partially installed in the mounting groove 121 and is tightly connected to the bottom wall of the mounting groove 121 facing the notch. In this case, the bottom wall of the mounting groove 121 may be the second tight-fitting surface described above. This structure of providing the mounting groove 121 in the mounting seat 120 and placing at least part of the counterweight 130 in the mounting groove 121 can help lower the center of gravity of the entire leak detector body 100, so that it can be placed on the measured surface 300 more stably.

[0037] In a more preferred solution, the counterweight portion 130 is entirely located within the mounting groove 121. In this case, the counterweight portion 130 can be hidden within the mounting groove 121. Since the counterweight portion 130 and the mounting base 120 are made of different materials, this method can avoid visual differences in appearance caused by different materials, which is beneficial to improving the appearance performance of the leak detector.

[0038] As described above, in the specific detection process, the sound vibration from the measured surface 300 is transmitted to the mounting seat 120 through the counterweight 130. When the counterweight 130 is partially located in the mounting groove 121 and the other part extends through the notch of the mounting groove 121, the counterweight 130 can directly contact the measured surface 300. Of course, the counterweight 130 can also be isolated from the mounting seat 120 and the measured surface 300 by other methods.

[0039] The leak detector body 100 disclosed in the embodiment of the present application may further include a support protrusion 150 disposed on the counterweight part 130. When the leak detector body 100 is placed on the measured surface 300, the counterweight part 130 is supported on the measured surface 300 by the support protrusion 150. The support protrusion 150 is used to transmit the sound vibration to the mounting seat 120 through the counterweight part 130. In the specific working process, the sound vibration from the measured surface 300 is transmitted to the support protrusion 150, and then transmitted to the counterweight part 130 by the support protrusion 150, and then transmitted to the mounting seat 120 by the counterweight part 130, and finally transmitted to the pickup sensor 110 by the mounting seat 120, and then sensed. The setting of the support protrusion 150 can better adapt to some uneven measured surfaces 300, and thus facilitate the stable placement of the leak detector body 100 on the measured surface 300.

[0040] In a further technical solution, there may be multiple supporting protrusions 150, and they may be evenly distributed around the central axis of the counterweight 130. The central axis of the counterweight 130 coincides with the central axis of the leak detector body 100. This distribution method supports the counterweight 130 through multiple supporting protrusions 150, thereby achieving more stable and balanced support. It should be noted that, in this article, the central axis of the leak detector body 100 is the center line passing through the top of the leak detector body 100 and the bottom of the leak detector body 100. When the leak detector body 100 is placed on the measured surface 300, the bottom of the leak detector body 100 is closer to the measured surface 300. When the leak detector body 100 is placed on the horizontal measured surface 300, the central axis of the leak detector body 100 is a vertical line, which passes through the geometric center of the leak detector body 100 from top to bottom.

[0041] Specifically, the counterweight 130 may be provided with threaded holes corresponding to the plurality of support protrusions 150 one by one, and the support protrusions 150 are provided with second threaded connectors, and the support protrusions 150 are detachably connected to the counterweight 130 through the cooperation between the second threaded connectors and the threaded holes. This connection method can facilitate the disassembly, replacement and maintenance of the support protrusions 150. Of course, by adjusting the connection depth of the second threaded connector in the threaded hole, the counterweight 130 can be leveled, and then the leak detector body 100 can be leveled.

[0042] In order to better ensure assembly, the shape of the mounting seat 120 and the shape of the counterweight 130 are adapted, and the central axis of the mounting seat 120 and the central axis of the counterweight 130 are both coincident with the central axis of the leak detector body. This structure of matching shapes and coinciding central axes can improve the balance and consistency of the sound vibration transmission of the counterweight 130 and the mounting seat 120, thereby making it more conducive to the sound vibrations from multiple directions sensed by the sound pickup sensor 110 to be more consistent, thereby better improving the detection effect. Of course, this way of coinciding the central axes of each component makes the center of gravity of the entire leak detector body 100 on its central axis, thereby avoiding unbalanced weight and helping to improve the stability of being placed on the measured surface 300.

[0043] Specifically, the mounting seat 120 may be a triangular structure, and accordingly, the counterweight portion 130 may also be a triangular structure. For another example, the mounting seat 120 may be a circular structure, and accordingly, the counterweight portion 130 may also be a circular structure. The embodiment of the present application does not limit the specific shapes of the mounting seat 120 and the counterweight portion 130, nor does it limit this.

[0044] In order to more evenly sense the sound vibration transmitted by the mounting seat 120, in a more preferred solution, the sound pickup sensor 110 is installed at the center of the mounting seat 120, and the leak detector body 100 may also include a cover 160, which is arranged on the mounting seat 120, and the cover 160 and the mounting seat 120 form a protective space. The sound pickup sensor 110 is arranged in the protective space. The central axis of the cover 160 coincides with the central axis of the leak detector body 100. This structure allows the sound pickup sensor 110 to be centered at the center of the mounting seat 120 and located on the central axis of the leak detector body 100, so that the sound vibration received by the sound pickup sensor 110 is more consistent, thereby providing a detection effect. At the same time, the cover 160 can protect the sound pickup sensor 110 to prevent the sound pickup sensor 110 from being damaged.

[0045] As mentioned above, the mounting base 120 and the counterweight 130 are made of different materials. Specifically, the mounting base 120 can be an aluminum structural member, and the counterweight 130 can be a steel structural member. Of course, the aluminum structural member has the advantage of being light, and the steel structural member has a high density. At the same time, the inventor has found through research that the resonance frequency of the steel structural member is just outside the detection frequency range of the leak detector, and it is a structural member that is easier to obtain and easier to use as the counterweight 130.

[0046] In different scenarios, the buried depth of the infusion pipeline under the measured surface 300 is different. For the shallowly buried infusion pipeline, when the leak detector body 100 is directly placed on the measured surface 300, the counterweight 130 or the support protrusion 150 can directly or indirectly transmit the sound vibration from the measured surface 300 to the mounting base 120, and finally transmit it from the mounting base 120 to the sound pickup sensor 110. However, for the deeply buried infusion pipeline, it is difficult to achieve a good detection effect by placing the leak detector body 100 directly on the measured surface 300 for detection.

[0047] Based on this, in a further technical solution, the leak detector body 100 disclosed in the embodiment of the present application may further include a pin 170, which is arranged on the counterweight part 130 and is located on the side of the counterweight part 130 close to the measured surface 300. In which, when the leak detector body 100 is placed on the measured surface 300, at least a portion of the pin 170 is inserted into the measured surface 300, and the pin 170 sequentially transmits the sound vibration to the counterweight part 130, the mounting seat 120 and the pickup sensor 110. In this case, at least a portion of the pin 170 is inserted into the measured surface 300, so that it can play a positioning role, and further improve the placement of the leak detector body 100 on the measured surface 300. At the same time, the pin 170 can extend into the measured surface 300 to pick up the sound vibration, and then directly and more efficiently transmit the sound vibration from the measured surface 300 to the counterweight 130, and finally transmit it to the sound pickup sensor 110 through the mounting seat 120. Obviously, in this case, the pin 170 not only plays a role in positioning the entire leak detector body 100, but also can more directly and efficiently transmit the sound vibration from the measured surface 300 to the mounting seat 120, thereby improving the detection effect of the entire leak detector.

[0048] Optionally, a second connection hole 133 may be provided at the center of the weight portion 130, and the first end of the pin 170 is connected to the second connection hole 133. The second end of the pin 170 is a pointed structure, which is convenient for insertion into the measured surface 300. In a further technical solution, the first end of the pin 170 is detachably connected to the second connection hole 133, and this connection method can detach the pin 170 when testing in a scenario where the pin 170 is not needed.

[0049] The leak detector disclosed in the embodiment of the present application may include an electrical connector 180, a cable and a host. The electrical connector 180 may be an aviation plug. The electrical connector 180 is connected to the cover 160, and the electrical connector 180 is electrically connected to the sound pickup sensor 110. The two ends of the cable are electrically connected to the electrical connector 180 and the host, respectively. In the specific working process, the signal generated by the sound pickup sensor 110 will be transmitted to the host through the cable, and then subsequent analysis, processing and display will be performed. In a further technical solution, the cable can be used as a lifting part 200. In this case, the cable can not only play the role of electrical connection, but also can be used as a lifting part 200 for the operator to grasp, so as to achieve the purpose of moving the leak detector and realize dual purposes.

[0050] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features of the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0051] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A leak detector, comprising a leak detector body (100) and a lifting portion (200), wherein the lifting portion (200) is connected to the leak detector body (100), and the leak detector body (100) can be moved by lifting the lifting portion (200), characterized in that: The leak detector body (100) comprises a sound pickup sensor (110), a mounting seat (120) and a counterweight (130); the sound pickup sensor (110) is mounted on the mounting seat (120); the counterweight (130) is closely connected to the mounting seat (120); the counterweight (130) and the mounting seat (120) are made of different materials; the resonance frequency of the counterweight (130) is outside the detection frequency range of the leak detector; When the leak detector body (100) is placed on a surface to be measured (300), the counterweight (130) is located on a side of the sound pickup sensor (110) close to the surface to be measured (300), and the counterweight (130) is located on a side of the mounting seat (120) close to the surface to be measured (300); the counterweight (130) sequentially transmits sound vibrations from the surface to be measured (300) to the mounting seat (120) and the sound pickup sensor (110); The leak detector body (100) further comprises a cover shell (160), wherein the cover shell (160) is arranged on the mounting seat (120), and the cover shell (160) and the mounting seat (120) enclose a protective space.

2. The leak detector according to claim 1, characterized in that: The counterweight portion (130) is a plate-shaped structural member and has a first close-fitting surface (131); the mounting seat (120) has a second close-fitting surface; the counterweight portion (130) is tightly connected to the mounting seat (120); the first close-fitting surface (131) is tightly matched with the second close-fitting surface; the first close-fitting surface (131) is the plate surface of the plate-shaped structural member.

3. The leak detector according to claim 2, characterized in that: The counterweight portion (130) and the mounting seat (120) are fastened together via a plurality of first threaded connectors (140) that are spaced apart from each other. The plurality of first threaded connectors (140) are evenly distributed around a central axis of the counterweight portion (130) and a central axis of the mounting seat (120). The central axis of the counterweight portion (130) and the central axis of the mounting seat (120) both coincide with a central axis of the leak detector body (100).

4. The leak detector according to claim 1, characterized in that: The mounting seat (120) is provided with a mounting groove (121), and when the leak detector body (100) is placed on the surface to be measured (300), the notch of the mounting groove (121) faces the surface to be measured (300); The counterweight portion (130) is at least partially installed in the installation groove (121), and is tightly connected to the bottom wall of the installation groove (121) facing the groove opening.

5. The leak detector according to claim 1, characterized in that: The leak detector body (100) further comprises a supporting protrusion (150) provided on the counterweight portion (130); when the leak detector body (100) is placed on a surface to be measured (300), the counterweight portion (130) is supported on the surface to be measured (300) via the supporting protrusion (150); the supporting protrusion (150) is used to transmit the sound vibration to the mounting seat (120) via the counterweight portion (130).

6. The leak detector according to claim 5, characterized in that: The supporting protrusions (150) are multiple and evenly distributed around the central axis of the counterweight part (130), and the central axis of the counterweight part (130) coincides with the central axis of the leak detector body (100).

7. The leak detector according to claim 1, characterized in that: The shape of the mounting seat (120) is adapted to the shape of the counterweight portion (130), and the central axis of the mounting seat (120) and the central axis of the counterweight portion (130) both coincide with the central axis of the leak detector body (100).

8. The leak detector according to claim 1, characterized in that: The sound pickup sensor (110) is mounted at the center of the mounting seat (120), the sound pickup sensor (110) is arranged within the protective space, and the central axis of the cover shell (160) coincides with the central axis of the leak detector body (100).

9. The leak detector according to any one of claims 1 to 8, characterized in that: The counterweight part (130) is a steel structural part, and the mounting seat (120) is an aluminum structural part.

10. The leak detector according to any one of claims 1 to 8, characterized in that: The leak detector body (100) further comprises an insertion pin (170), wherein the insertion pin (170) is arranged on the counterweight portion (130) and is located on a side of the counterweight portion (130) close to the measured surface (300), wherein: When the leak detector body (100) is placed on the surface to be measured (300), at least a portion of the insertion pin (170) is inserted into the surface to be measured (300), and the insertion pin (170) sequentially transmits the sound vibration to the counterweight portion (130), the mounting seat (120), and the sound pickup sensor (110).

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