Plugging structure for leak detection of electronic expansion valve and leak detection equipment

Abstract

The utility model discloses a plugging structure for leak detection of an electronic expansion valve and leak detection equipment, and relates to the field of electronic expansion valve quality inspection equipment, the plugging structure comprises a rack, a plurality of vacuum boxes are arranged on the rack, and each vacuum box is divided into two vacuum chambers. According to the utility model, the plurality of vacuum chambers capable of detecting the electronic expansion valves are formed through the combination of the plurality of vacuum boxes, so that the leak detection of the plurality of electronic expansion valves is facilitated, and the leak detection efficiency is improved. The vacuum chamber is internally provided with the pressing column capable of blocking the interface position of the electronic expansion valve, so that helium is prevented from entering from the existing interface position of the electronic expansion valve, and the accuracy of leak detection operation is improved. According to the leak detection equipment, through the arrangement of the waste material channel and the material conveying channel, the electronic expansion valves in the multiple vacuum chambers can be rapidly screened and transferred, the leak detection equipment is suitable for the working environment where leak detection operation is carried out on the multiple electronic expansion valves, and the working efficiency of the whole leak detection equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of quality inspection equipment for electronic expansion valves, in particular to a plugging structure for leak detection of electronic expansion valves and a leak detection equipment. Background Art

[0002] The electronic expansion valve adjusts the liquid supply of the evaporator according to the preset program. Because it belongs to the electronic adjustment mode, it is called an electronic expansion valve. It adapts to the development requirements of refrigeration mechatronics, has excellent characteristics that thermal expansion valves cannot match, and provides conditions for the intelligent control of refrigeration systems.

[0003] During the production process of electronic expansion valves, in order to detect whether there are leaks on their surface, it is necessary to perform a sealing test on them. Most of the existing sealing test methods use a vacuum box to perform helium mass spectrometry leak detection. The electronic expansion valve to be tested is placed inside the vacuum box, and the inside of the box is evacuated. Subsequently, helium is injected into the box. By monitoring the leakage of helium in the vacuum box, it is determined whether the electronic expansion valve has a leak.

[0004] Most of the existing leak detection equipment applied to electronic expansion valves uses a transmission device to move multiple electronic expansion valves into a detection station in sequence to perform detection operations. The number of electronic expansion valves that can perform helium leak detection operations at the detection station is very limited. If the number of electronic expansion valves to be detected is large, the detection time is long, the efficiency of the detection work is reduced, and the efficiency of the subsequent sorting work is affected. Utility Model Content

[0005] In view of the above problems, the present application provides a sealing structure and a leak detection device for an electronic expansion valve.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a sealing structure for leak detection of an electronic expansion valve, comprising a frame on which a plurality of vacuum boxes are arranged, each of the vacuum boxes is divided into two vacuum chambers, and each of the vacuum chambers is arranged with a positioning tooling adapted to the electronic expansion valve and a sensor for identifying changes in gas inside the cavity.

[0007] A movable pressure column is arranged in the vacuum chamber to block the interface position of the electronic expansion valve. A linkage shaft is installed at one end of the pressure column away from the electronic expansion valve. A first driving cylinder that can drive the linkage shaft to move linearly is provided on the outside of the vacuum box.

[0008] Furthermore, a second driving cylinder is arranged above the vacuum box, and a movable sealing cover is provided at the output end of the second driving cylinder. When the sealing cover is moved to just above the vacuum box, the openings of the two vacuum chambers can be blocked. The vacuum box is provided with a linear guide rail compatible with the sealing cover.

[0009] Furthermore, each of the vacuum boxes is provided with two groups of first pipeline interfaces and second pipeline interfaces connected to the two vacuum chambers.

[0010] Furthermore, the vacuum box is provided with two vacuum gauges connected to the vacuum chambers.

[0011] An electronic expansion valve leak detection device includes the above-mentioned electronic expansion valve leak detection sealing structure, a material transport platform is arranged above the vacuum box, a movable gripper compatible with the electronic expansion valve is arranged on the material transport platform, and the movable gripper can move the electronic expansion valve into and out of the vacuum chamber.

[0012] The rack is provided with a waste channel for transferring unqualified electronic expansion valves, and the rear of the rack is provided with a material transport channel for transferring qualified electronic expansion valves.

[0013] Furthermore, multiple groups of the second pipeline interfaces are connected to main pumping equipment and pre-pumping equipment, and multiple groups of the first pipeline interfaces are connected to helium filling equipment. The main pumping equipment, pre-pumping equipment and helium filling equipment are all installed on the inside of the equipment fence.

[0014] Furthermore, a helium detection device is provided at the rear of the frame, and the helium detection device is communicatively connected with the sensor in the vacuum chamber.

[0015] Furthermore, an electric control cabinet is provided at the rear of the rack.

[0016] In summary, the technical effects and advantages of the utility model are:

[0017] The utility model forms multiple vacuum chambers that can perform detection operations on electronic expansion valves through the combination of multiple vacuum boxes, which facilitates the implementation of leak detection operations on multiple electronic expansion valves and improves the efficiency of leak detection. A pressure column that can block the interface position of the electronic expansion valve is provided in the vacuum chamber to prevent helium from entering from the existing interface of the electronic expansion valve, thereby improving the accuracy of the leak detection operation. The waste channel and the material transport channel are set in the leak detection equipment, which can quickly screen and transfer the electronic expansion valves in multiple vacuum chambers, and is suitable for the working environment of performing leak detection operations on multiple electronic expansion valves, thereby improving the efficiency of the entire leak detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1It is a schematic diagram of the top view of the plugging structure of the utility model.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the plugging structure of the utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the vacuum box of the utility model.

[0022] Figure 4 This is a schematic diagram of the top view of the vacuum box of the utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the leak detection equipment of the utility model.

[0024] Figure 6 This is a schematic diagram of the structure of the leak detection device of the utility model from a top view.

[0025] In the figure: 1. rack; 2. vacuum box; 21. first pipeline interface; 22. second pipeline interface; 23. positioning tooling; 3. vacuum gauge; 4. material transport platform; 5. movable gripper; 6. waste channel; 7. pressure column; 8. linkage shaft; 9. first drive cylinder; 10. second drive cylinder; 11. sealing cover plate; 12. linear guide; 13. main extraction equipment; 14. pre-extraction equipment; 15. helium filling equipment; 16. helium inspection equipment; 17. electric control cabinet; 18. material transport channel. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] refer to Figure 1-4 The plugging structure for leak detection of an electronic expansion valve shown in the figure comprises a frame 1, on which a plurality of vacuum boxes 2 are arranged, each of which is divided into two vacuum chambers, and each of which is provided with a positioning tool 23 adapted to the electronic expansion valve and a sensor for identifying changes in the gas inside the chamber. The combination of the plurality of vacuum boxes 2 forms a plurality of vacuum chambers for performing detection operations on the electronic expansion valves, which facilitates leak detection operations on the plurality of electronic expansion valves and improves the efficiency of leak detection work.

[0029] A movable pressure column 7 is arranged in each vacuum chamber to block the interface position of the electronic expansion valve to prevent helium from entering from the existing interface of the electronic expansion valve, so that the pressure column 7 can be smoothly connected to the electronic expansion valve. A linkage shaft 8 is installed at one end of the pressure column 7 away from the electronic expansion valve, and a first driving cylinder 9 that can drive the linkage shaft 8 to move linearly is arranged on the outer side of the vacuum box 2.

[0030] like Figure 2 As shown, a second driving cylinder 10 is arranged above the vacuum box 2, and a movable sealing cover plate 11 is provided at the output end of the second driving cylinder 10. When the sealing cover plate 11 moves to the top of the vacuum box 2, the openings of the two vacuum chambers can be blocked, while maintaining the airtightness of the two vacuum chambers. In order to enable the sealing cover plate 11 to dock with the vacuum box 2 accurately, a linear guide rail 12 adapted to the sealing cover plate 11 is provided on the vacuum box 2.

[0031] like Figure 3 As shown, in order to evacuate and fill the vacuum chamber with helium, each vacuum box 2 is provided with two sets of first pipeline interfaces 21 and second pipeline interfaces 22 connected to the two vacuum chambers.

[0032] like Figure 2 As shown, in order to confirm the pressure state inside the vacuum chamber when it is evacuated, the vacuum box 2 is provided with two vacuum gauges 3 connected to the vacuum chamber.

[0033] Embodiment 2:

[0034] like Figure 5 , Figure 6 As shown, an electronic expansion valve leak detection device includes the above-mentioned electronic expansion valve leak detection sealing structure, a material transport platform 4 is arranged above the vacuum box 2, and a movable gripper 5 adapted to the electronic expansion valve is arranged on the material transport platform 4, and the movable gripper 5 can move the electronic expansion valve into and out of the vacuum chamber.

[0035] The rack 1 is provided with a waste channel 6 for transferring unqualified electronic expansion valves, and the rear of the rack 1 is provided with a material transport channel 18 for transferring qualified electronic expansion valves. The waste channel 6 and the material transport channel 18 can quickly classify and transfer the electronic expansion valves in multiple vacuum chambers, and quickly screen the electronic expansion valves that do not meet the specifications from the electronic expansion valves that meet the specifications, which is suitable for the working environment of performing leak detection operations on multiple electronic expansion valves, and improves the working efficiency of the entire leak detection equipment.

[0036] like Figure 5 , Figure 6As shown, in order to perform vacuuming and helium filling operations inside the vacuum chamber, multiple sets of second pipeline interfaces 22 are connected to the main extraction equipment 13 and the pre-extraction equipment 14. The combination of the main extraction equipment 13 and the pre-extraction equipment 14 can first perform the pre-extraction operation inside the vacuum chamber, and then perform the vacuuming operation inside the vacuum chamber, effectively avoiding the phenomenon that the electronic expansion valve inside the cavity is slightly deformed under the action of pressure when the air in the vacuum chamber is suddenly extracted. Multiple sets of first pipeline interfaces 21 are all connected to the helium filling equipment 15, and the main extraction equipment 13, the pre-extraction equipment 14 and the helium filling equipment 15 are all installed on the inside of the equipment fence.

[0037] like Figure 5 , Figure 6 As shown, a helium detection device 16 is provided at the rear of the rack 1, and the helium detection device 16 is connected to the sensor in the vacuum chamber. If the electronic expansion valve in the vacuum chamber has a leak, the helium in the vacuum chamber will diffuse to the surroundings through the leak due to its small molecule and high diffusion characteristics. The sensor can sense and detect the concentration of the leaked helium in real time, and transmit the data to the helium detection device 16. The helium detection device 16 determines the location of the leak by processing and analyzing the concentration data, and outputs the judgment result to the terminal PLC controller.

[0038] like Figure 5 , Figure 6 As shown, in order for the staff to control the operation of multiple devices in the entire leakage detection equipment, an electric control cabinet 17 is provided at the rear of the rack 1.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plugging structure for leak detection of an electronic expansion valve, comprising a frame (1), characterized in that: A plurality of vacuum boxes (2) are arranged on the frame (1), each of the vacuum boxes (2) is divided into two vacuum chambers, and each of the vacuum chambers is provided with a positioning tool (23) adapted to the electronic expansion valve and a sensor for identifying changes in the gas inside the chamber; A movable pressure column (7) is arranged in each of the vacuum chambers for sealing the interface position of the electronic expansion valve, a linkage shaft (8) is installed at one end of the pressure column (7) away from the electronic expansion valve, and a first driving cylinder (9) is provided on the outside of the vacuum box (2) for driving the linkage shaft (8) to move linearly.

2. The plugging structure for leak detection of an electronic expansion valve according to claim 1, characterized in that: A second driving cylinder (10) is arranged above the vacuum box (2), and a movable sealing cover plate (11) is provided at the output end of the second driving cylinder (10). When the sealing cover plate (11) moves to the top of the vacuum box (2), the openings of the two vacuum chambers can be blocked. A linear guide rail (12) matched with the sealing cover plate (11) is provided on the vacuum box (2).

3. The plugging structure for leak detection of an electronic expansion valve according to claim 1, characterized in that: Each of the vacuum boxes (2) is provided with two groups of first pipeline interfaces (21) and second pipeline interfaces (22) connected to the two vacuum chambers.

4. The plugging structure for leak detection of an electronic expansion valve according to claim 1, characterized in that: The vacuum box (2) is provided with two vacuum gauges (3) connected to the vacuum chambers.

5. An electronic expansion valve leakage detection device, comprising the electronic expansion valve leakage detection plugging structure according to any one of claims 1 to 4, characterized in that: A material transport platform (4) is arranged above the vacuum box (2), and a movable gripper (5) adapted to the electronic expansion valve is arranged on the material transport platform (4), and the movable gripper (5) can move the electronic expansion valve into and out of the vacuum chamber; The frame (1) is provided with a waste channel (6) for transferring unqualified electronic expansion valves, and the rear of the frame (1) is provided with a material transport channel (18) for transferring qualified electronic expansion valves.

6. The electronic expansion valve leakage detection device according to claim 5, characterized in that: A plurality of groups of the second pipeline interfaces (22) are connected to a main extraction device (13) and a pre-extraction device (14), and a plurality of groups of the first pipeline interfaces (21) are connected to a helium filling device (15). The main extraction device (13), the pre-extraction device (14) and the helium filling device (15) are all installed on the inner side of the equipment fence.

7. The electronic expansion valve leakage detection device according to claim 5, characterized in that: A helium detection device (16) is provided at the rear of the frame (1), and the helium detection device (16) is communicatively connected with a sensor in the vacuum chamber.

8. The electronic expansion valve leakage detection device according to claim 5, characterized in that: An electric control cabinet (17) is arranged at the rear of the frame (1).

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