Automatic refrigerant leak detection device for heat pump water heater assembly

Abstract

The utility model discloses a kind of automatic refrigerant leak detection devices for heat pump water heater assembly, belong to refrigeration equipment detection technical field, including leak detector, detection module, hose, internal thread rotating sleeve and dustproof assembly, hollow threaded column is provided on the leak detector, the front end of the detection module is fixed with test head, the internal thread rotating sleeve is connected with the hollow threaded column, the hose connection end is provided with connecting pipe, sealing ring and extrusion ring, when the internal thread rotating sleeve is screwed, its inner wall is abutted to extrusion ring and push its axial extrusion sealing ring, to enhance the air tightness of connection. The utility model improves the air tightness of refrigerant connection by the cooperation of internal thread rotating sleeve and extrusion ring, simultaneously, through the dustproof sleeve structure of automatic reset, effectively solve the problem that test head is easily contaminated and damaged under non-working state, with the beneficial effect of improving detection accuracy, prolonging equipment service life.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment testing technology, and in particular to an automatic refrigerant leak detection device for heat pump water heater assembly. Background Technology

[0002] As a highly efficient and energy-saving water heating device, heat pump water heaters require strict sealing of the refrigerant piping during production and assembly to ensure product quality and safety. Even the slightest refrigerant leak can lead to decreased equipment performance, increased energy consumption, and even environmental pollution; therefore, precise detection using specialized leak detection equipment is essential.

[0003] Currently, portable electronic refrigerant leak detection devices are widely used on heat pump water heater assembly lines. These devices typically include a main unit and a connecting hose. The end of the hose is equipped with a high-precision gas sensor, or test head, used to collect air samples around the pipe connection to determine if a refrigerant leak is present.

[0004] However, in the high-traffic and fast-moving environment of assembly workshops, testing personnel often carelessly place the leak detection device after completing a test or when moving between workstations. This leaves the test head, a core component, exposed for extended periods. Dust, oil, and other contaminants in the workshop environment easily adhere to the surface of the test head or penetrate its interior, directly affecting the sensor's sensitivity and accuracy. Furthermore, the exposed test head is susceptible to physical damage from accidental bumps. Most existing leak detection devices lack integrated effective protective structures or only provide a separate protective cap that requires manual installation and removal. This cap is easily lost and cumbersome to operate, making it impractical on fast-paced assembly lines. This results in the test head remaining unprotected for extended periods, ultimately leading to inaccurate test data, shortened equipment lifespan, and increased maintenance costs.

[0005] Therefore, this utility model proposes an automatic refrigerant leak detection device for heat pump water heater assembly to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides an automatic refrigerant leak detection device for heat pump water heater assembly, aiming to improve the problem that the test head in the prior art lacks a convenient and effective protective structure when idle, and is easily contaminated by external dust and damaged by impacts, thereby affecting the detection accuracy and service life.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An automatic refrigerant leak detection device for heat pump water heater assembly includes a leak detector, a detection module, a hose, an internal threaded sleeve, and a dustproof component. The leak detector is equipped with a hollow threaded post, and the internal threaded sleeve is threadedly connected to the hollow threaded post. One end of the hose is fixed with a connecting pipe, and a sealing ring is fixed to the outer periphery of the front end of the connecting pipe. A compression ring is also fitted on the connecting pipe, and the compression ring is located behind the sealing ring. The inner wall of the internal threaded sleeve abuts against the outer periphery of the compression ring. By tightening the internal threaded sleeve, the compression ring is pushed to axially compress the sealing ring. Furthermore, a test head is fixed to the front end of the detection module, and the dustproof component includes a dustproof sleeve and a locking block; the dustproof sleeve is slidably fitted onto the outside of the test head along the axial direction of the test head; the locking block is slidably installed on the detection module, and the locking block includes a sliding limiting plate, the front end of which is linked to the rear end of the dustproof sleeve; a guide sliding post is also fixed on the detection module, and the sliding limiting plate is set on the guide sliding post by a sliding engagement. Preferably, the locking block further includes a pin block integrally formed with the sliding limiting plate, and the pin block is also slidably engaged with the guide sliding post; Preferably, the locking block further includes a pull rod, one end of which is fixedly connected to the pin block and the sliding limiting plate, and the other end of which extends to the outside of the detection module; Preferably, the dustproof component further includes a spring, which is sleeved on the guide sliding post, and the two ends of the spring respectively abut against the fixed part of the detection module near the test head and the rear end face of the sliding limit plate; Preferably, the connecting tube is detachably inserted into the interior of the internal threaded sleeve, and the front end of the connecting tube extends into the hollow threaded column; Preferably, the compression ring is made of a metal ring, and the sealing ring is made of an elastic rubber ring; Preferably, the dustproof sleeve has a hollow cylindrical structure, and its inner diameter is clearance-fitted with the outer diameter of the test head; Preferably, there are two guide sliding posts, which are arranged in parallel on the detection module.

[0008] This utility model has the following beneficial effects: 1. This utility model solves the problem of poor sealing at the connection between the hose and the instrument in the prior art, which is prone to inaccurate test results due to air leakage, by setting an internal threaded rotating sleeve and using the internal extrusion ring to push the internal extrusion ring to axially compress the sealing ring at the front end of the connecting pipe when the internal threaded rotating sleeve is tightened. It achieves the effect of significantly improving the airtightness of the connection and the accuracy of the measurement.

[0009] 2. This utility model solves the problem in the prior art that the test head of the test module lacks effective protection when idle and is easily damaged by dust contamination and external impact by setting a sliding dustproof sleeve on the test module and a locking block mechanical structure for driving the dustproof sleeve to slide. It achieves the effect of effectively protecting the test head, extending its service life and ensuring long-term test accuracy.

[0010] 3. This utility model integrates the pull rod, spring and guide sliding column into the locking block structure to form a linkage mechanism to control the extension and retraction of the dustproof sleeve, which solves the problems of complex structure and inconvenient operation of existing protection devices, and achieves the effect of compact structure, convenient operation and stable and reliable action. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of an automatic refrigerant leak detection device for a heat pump water heater according to the present invention. Figure 2 An exploded structural diagram of the sealing ring of an automatic refrigerant leak detection device for a heat pump water heater proposed in this utility model. Figure 3 This utility model provides a schematic diagram of a dustproof sleeve structure for an automatic refrigerant leak detection device for heat pump water heater assembly. Figure 4 An exploded structural diagram of the locking block of an automatic refrigerant leak detection device for a heat pump water heater proposed in this utility model; Figure 5 This is a schematic diagram of the pin block structure of an automatic refrigerant leak detection device for assembling a heat pump water heater, as proposed in this utility model.

[0012] Legend: 1. Leak detector; 2. Internal threaded sleeve; 201. Hollow threaded post; 202. Connecting pipe; 203. Extrusion ring; 204. Sealing ring; 3. Hoses; 4. Detection module; 401. Dustproof sleeve; 402. Test head; 5. Locking block; 501. Pin block; 502. Sliding limit plate; 503. Guide sliding post; 504. Spring; 505. Pull rod. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Reference Figures 1-5An embodiment of this utility model provides an automatic refrigerant leak detection device for heat pump water heater assembly, including a leak detector 1, a detection module 4, and a hose 3 connecting the leak detector 1 and the detection module 4. The leak detector 1 is provided with a hollow threaded post 201, and the front end of the detection module 4 is fixed with a test head 402. This device enhances the connection sealing by providing an internal threaded rotating sleeve 2, and protects the test head 402 by providing a dustproof component. Specifically, it also includes an internally threaded rotating sleeve 2, which is threadedly connected to a hollow threaded post 201. One end of the flexible hose 3 is fixed with a connecting pipe 202. A sealing ring 204 is fixed to the outer periphery of the front end of the connecting pipe 202. A compression ring 203 is fitted onto the connecting pipe 202, located behind the sealing ring 204. The inner wall of the internally threaded rotating sleeve 2 abuts against the outer periphery of the compression ring 203. When the internally threaded rotating sleeve 2 is tightened, the inner wall of the internally threaded rotating sleeve 2 pushes the compression ring 203 to move axially, thereby compressing the sealing ring 204 and causing the sealing ring 204 to undergo elastic deformation to fill the connection gap. To achieve a reliable airtight connection, the device also includes a dustproof component, which includes a dustproof sleeve 401 and a locking block 5. The dustproof sleeve 401 is slidably sleeved on the outside of the test head 402 along the axial direction of the test head 402. The locking block 5 is slidably installed on the detection module 4. The locking block 5 includes a sliding limit plate 502. The front end of the sliding limit plate 502 is linked to the rear end of the dustproof sleeve 401 to transmit driving force. The detection module 4 is also fixed with a guide sliding column 503. The sliding limit plate 502 is slidably engaged with the guide sliding column 503 to provide stable guidance and support for the reciprocating motion of the locking block 5. The dustproof component comprises the structure of the locking block 5 and the motion transmission mechanism driven by the locking block 5. The locking block 5 includes a pin block 501 integrally formed with the sliding limit plate 502. Both the pin block 501 and the sliding limit plate 502 are slidably engaged with the guide sliding post 503 fixed on the detection module 4. This slidable engagement provides precise guidance and limitation for the reciprocating motion of the locking block 5. The locking block 5 also includes a pull rod 505. One end of the pull rod 505 is fixedly connected to the pin block 501 and the sliding limit plate 502, and the other end of the pull rod 505 extends to the outside of the detection module 4, facilitating pulling or releasing operations by the operator. The dustproof component also includes a spring 504 that provides reset power. The spring 504 is sleeved on the guide sliding post 503. Furthermore, the two ends of the spring 504 abut against the fixed part of the detection module 4 near the test head 402 and the rear end face of the sliding limit plate 502, respectively. In the assembled state, when the locking block 5 is pulled backward by the pull rod 505, the sliding limit plate 502 will compress the spring 504. At the same time, through the linkage connection between the sliding limit plate 502 and the dustproof sleeve 401, the dustproof sleeve 401 will move backward synchronously, so that the test head 402 is fully exposed to perform the detection work. When the detection is completed and the pull rod 505 is released, the elastic force of the compressed spring 504 will push the sliding limit plate 502 to automatically return to the front, and then push the dustproof sleeve 401 to slide forward smoothly until it completely covers the test head 402. This structure ensures the stability and reliability of the dustproof action. As a preferred embodiment, in order to improve the stability and guiding accuracy of the sliding block 5, there are two guide sliding posts 503, and the two guide sliding posts 503 are arranged in parallel on the detection module 4, which provides a smooth sliding track for the sliding limit plate 502 and the pin block 501, effectively preventing the block 5 from deflecting or jamming during the movement. As another preferred embodiment, in order to facilitate the installation and replacement of the hose 3, the connecting pipe 202 is detachably inserted into the interior of the internal threaded sleeve 2, and the front end of the connecting pipe 202 extends into the hollow threaded post 201. This structure not only ensures the smooth connection of the gas passage, but also simplifies maintenance operations. In one specific implementation, to ensure effective transmission of the extrusion force and reliable sealing, the extrusion ring 203 is preferably a metal ring to provide sufficient rigidity to transmit the axial thrust applied by the internal threaded sleeve 2, while the sealing ring 204 is preferably an elastic rubber ring to ensure good elastic deformation when compressed by the extrusion ring 203, thereby tightly fitting the surface of the connection part. In order to achieve smooth coverage and protection of the test head 402, the dustproof sleeve 401 has a hollow cylindrical structure. The inner diameter of the dustproof sleeve 401 and the outer diameter of the test head 402 form a clearance fit. This fit relationship can ensure that the dustproof sleeve 401 slides freely and avoids excessive shaking, thus ensuring the accuracy of the protective action.

[0015] Working principle: When making a leak test connection, first place one end of the hose 3 with the connecting tube 202 at the hollow threaded post 201 of the leak tester 1, and then tighten the inner threaded sleeve 2. During the tightening process, the inner wall structure of the inner threaded sleeve 2 will generate an axial thrust on the compression ring 203. The compression ring 203 will then compress the elastic rubber ring sealing ring 204 at the front end, causing the sealing ring 204 to deform and tightly fill the gap between the connecting tube 202 and the hollow threaded post 201, thereby forming a highly airtight connection channel. When preparing for the test, the operator pulls the lever 505 located outside the test module 4 backward. The lever 505 drives the pin block 501 and the sliding limit plate 502 to slide backward along the guide sliding column 503. During the sliding process, the rear end face of the sliding limit plate 502 will compress the spring 504 sleeved on the guide sliding column 503. At the same time, the dustproof sleeve 401, which is linked to the front end of the sliding limit plate 502, will also move backward synchronously until the front end of the test head 402 is fully exposed. At this time, the test head 402 can be brought close to the test point to detect refrigerant leakage. After the test is completed, the operator releases the lever 505, and the previously compressed spring 504 releases its elasticity, pushing the sliding limit plate 502 to automatically reset forward along the guide sliding column 503. The sliding limit plate 502 then pushes the dustproof sleeve 401 to slide forward until the front end of the dustproof sleeve 401 completely covers and protects the test head 402, thereby preventing dust or foreign objects from entering the interior of the test head 402 and ensuring the accuracy and service life of the test module 4.

Claims

1. An automatic refrigerant leak detection device for heat pump water heater assembly, comprising: Leak detector (1), wherein a hollow threaded column (201) is provided on the leak detector (1). The detection module (4) has a test head (402) fixed at its front end. A flexible hose (3) is connected between the leak detector (1) and the detection module (4); Its characteristic is that it further includes: An internal threaded swivel sleeve (2) is threadedly connected to the hollow threaded column (201). One end of the hose (3) is fixed with a connecting pipe (202). A sealing ring (204) is fixed on the outer periphery of the front end of the connecting pipe (202). A compression ring (203) is sleeved on the connecting pipe (202). The compression ring (203) is located behind the sealing ring (204). The inner wall of the internal threaded swivel sleeve (2) abuts against the outer periphery of the compression ring (203) to push the compression ring (203) to axially compress the sealing ring (204) when tightened. The dustproof assembly includes a dustproof sleeve (401) and a locking block (5). The dustproof sleeve (401) is slidably sleeved on the outside of the test head (402) along the axial direction of the test head (402). The locking block (5) is slidably installed on the detection module (4). The locking block (5) includes a sliding limit plate (502). The front end of the sliding limit plate (502) is linked to the rear end of the dustproof sleeve (401). The detection module (4) is also fixed with a guide sliding column (503). The sliding limit plate (502) is slidably engaged with the guide sliding column (503).

2. The automatic refrigerant leak detection device for heat pump water heater assembly according to claim 1, characterized in that: The card block (5) also includes a pin block (501) integrally formed with the sliding limit plate (502), and the pin block (501) is also slidably engaged with the guide sliding post (503).

3. The automatic refrigerant leak detection device for heat pump water heater assembly according to claim 2, characterized in that: The card block (5) also includes a pull rod (505), one end of which is fixedly connected to the pin block (501) and the sliding limit plate (502), and the other end of which extends to the outside of the detection module (4).

4. The automatic refrigerant leak detection device for heat pump water heater assembly according to claim 1, characterized in that: The dustproof component also includes a spring (504), which is sleeved on the guide sliding post (503), and the two ends of the spring (504) respectively abut against the fixed part of the detection module (4) near the test head (402) and the rear end face of the sliding limit plate (502).

5. An automatic refrigerant leak detection device for heat pump water heater assembly according to claim 1, characterized in that: The connecting tube (202) is detachably inserted inside the internal threaded sleeve (2), and the front end of the connecting tube (202) extends into the hollow threaded column (201).

6. An automatic refrigerant leak detection device for heat pump water heater assembly according to claim 1, characterized in that: The compression ring (203) is a metal ring, and the sealing ring (204) is an elastic rubber ring.

7. An automatic refrigerant leak detection device for heat pump water heater assembly according to claim 1, characterized in that: The dustproof sleeve (401) is a hollow cylindrical structure, and its inner diameter is in clearance fit with the outer diameter of the test head (402).

8. An automatic refrigerant leak detection device for heat pump water heater assembly according to claim 3, characterized in that: The number of guide sliding posts (503) is two, and the guide sliding posts (503) are arranged in parallel on the detection module (4).

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