Vacuum testing device for industrial refrigerating machine

Abstract

The utility model discloses a vacuum testing device for an industrial refrigerating machine, and belongs to the technical field of vacuum testing of refrigerating machines. Comprising a test board and a test cover, a middle through hole is formed in the test board, a pressure guide pipe is arranged in the middle through hole, a rubber plug is installed on the inner top wall of the test cover, a first through hole is formed in the rubber plug, a plug head is arranged in the pressure guide pipe, a second through hole is formed in the plug head, and the first through hole is communicated with the second through hole. The outer surface of the rubber plug is in sliding connection with an open groove in the upper surface of the plug head, the upper surface of the plug head is fixedly connected with a barrel piece, the outer surface of the barrel piece is in sliding connection with the test cover, and through cooperation of the test cover, the rubber plug, the first limiting mechanism, the plug head and the barrel piece, rapid replacement of the plug head and the rubber sleeve can be achieved; therefore, vacuum testing can be carried out on the connecting pipes of different models when the refrigerating machine is maintained, and the applicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum testing technology for refrigeration machines, and in particular to a vacuum testing device for industrial refrigeration machines. Background Technology

[0002] Vacuum testing is a crucial step in the manufacturing and maintenance of industrial refrigeration units. The purpose of vacuum testing is to further verify the airtightness of the refrigeration system. The vacuuming process is mainly used to remove air and moisture from the refrigeration equipment, ensuring that the absolute pressure of the residual air does not exceed the specified pressure value. After evacuating the connection pipes of the refrigeration unit with the help of an external vacuum testing device, the vacuum degree inside the refrigeration unit can be tested to ensure that the refrigeration unit can operate normally for a long time. The vacuum test of the refrigeration unit mainly tests the pressure-conducting pipes of the refrigeration unit.

[0003] Currently, vacuum testing of industrial refrigeration units typically involves connecting a sealed plug to a pressure-conducting tube. The procedure involves first evacuating the air from the tube, then monitoring the absolute pressure of the air inside to determine if it exceeds a specified pressure value. However, in existing vacuum testing equipment, the connection between the sealed plug and the vacuum pump's suction pipe, as well as the vacuum gauge, often uses a screw connection or a direct fixing connection. This connection method is particularly inconvenient when dealing with pressure-conducting tubes of different industrial refrigeration unit models. Changing the sealed plug to accommodate different models of pressure-conducting tubes becomes cumbersome and time-consuming, and in some cases, multiple vacuum testing devices may be needed to meet the testing requirements of different refrigeration unit models. This undoubtedly increases the cost and complexity of the testing. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing vacuum testing devices cannot be compatible with different types of pressure-conducting tubes, which increases the cost and complexity of vacuum testing. Therefore, this invention proposes an industrial refrigeration machine vacuum testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An industrial refrigeration vacuum testing device includes a test platform and a test cover. The test platform has a central through-hole, and a pressure-conducting tube is installed inside the central through-hole. A rubber plug is installed on the inner top wall of the test cover, and the rubber plug has a first through-hole inside. A plug is installed inside the pressure-conducting tube, and a second through-hole is installed inside the plug. The outer surface of the rubber plug is slidably connected to a groove on the upper surface of the plug. A cylindrical plate is fixedly connected to the upper surface of the plug, and the outer surface of the cylindrical plate is slidably connected to the test cover. A first limiting mechanism is provided inside the test cover, including a handle and a tongue-shaped block. The outer surface of the tongue-shaped block contacts the cylindrical plate. A rubber sleeve is fixedly connected to the outer surface of the plug, and the outer surface of the rubber sleeve is slidably connected to the pressure-conducting tube. A vacuum pump is installed on the upper surface of the test platform, and a connecting pipe is fixedly connected to the pumping end of the vacuum pump. The end of the connecting pipe away from the vacuum pump is fixedly connected to the test cover. A vacuum tester is installed inside the test cover.

[0007] Preferably, a support frame is fixedly connected to the upper surface of the test platform, an electric push rod is installed inside the support frame, an upper connecting plate is fixedly connected to the output end of the electric push rod, and four connecting columns are fixedly connected to the bottom surface of the upper connecting plate, with the bottom surfaces of the four connecting columns all fixedly connected to the upper surface of the test cover.

[0008] Preferably, the test cover has a transverse limiting groove inside, the outer surface of the tongue-shaped block is slidably connected to the transverse limiting groove, a pull rod is fixedly connected to the right side of the tongue-shaped block, the outer surface of the pull rod is slidably connected to the test cover, and a handle is fixedly connected to the right end of the pull rod.

[0009] Preferably, a spring is fitted on the outer surface of the pull rod, and the two ends of the spring are fixedly connected to the tongue block and the transverse limiting groove.

[0010] Preferably, the second limiting mechanism includes a bidirectional lead screw, a first support plate, and a second support plate. The top ends of the first support plate and the second support plate are fixedly connected to the bottom surface of the test platform. The bidirectional lead screw passes through the first support plate and extends to the outer surface of the second support plate. The bidirectional lead screw is rotatably connected to the first support plate and the second support plate respectively. A turntable is fixedly connected to one end of the bidirectional lead screw.

[0011] Preferably, the outer surface of the bidirectional lead screw is threaded with two irregularly shaped connecting plates, and the upper surface of each of the two irregularly shaped connecting plates is fixedly connected with a limiting clamp. The outer surface of each of the two limiting clamps is slidably connected to the central through hole, and the two limiting clamps are in contact with the outer surface of the pressure guiding pipe.

[0012] Compared with the prior art, this utility model provides an industrial refrigeration machine vacuum testing device, which has the following beneficial effects;

[0013] 1. By using the test cover, rubber plug, first limiting mechanism, and the cooperation between the plug and the cylinder, this utility model can achieve quick replacement of the plug and rubber sleeve, thereby enabling vacuum testing of different types of pressure guide tubes when repairing refrigeration machines, increasing the applicability of the device.

[0014] 2. By using the fit between the rubber plug, the first through hole, the plug, the rubber sleeve, and the second through hole, this utility model can increase the airtightness during vacuum testing and largely avoid affecting the vacuum test data.

[0015] 3. By using the cooperation between the central through hole and the second limiting mechanism, this utility model can limit the pressure guiding tubes of different sizes, making it convenient to clamp pressure guiding tubes of different sizes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This utility model Figure 2 Enlarged view of point A in the image;

[0019] Figure 4 This is a three-dimensional structural diagram of the second limiting mechanism of this utility model.

[0020] In the picture:

[0021] 1. Test stand; 2. Central through hole; 3. Pressure guide tube; 4. Stand; 5. Electric push rod; 6. Test cover; 7. Rubber plug; 8. First through hole; 9. First limiting mechanism; 901. Handle; 902. Pull rod; 903. Tongue block; 904. Spring; 10. Lateral limiting groove; 11. Plug; 12. Cylindrical plate; 13. Rubber sleeve; 14. Second through hole; 15. Vacuum tester; 16. Vacuum pump; 17. Connecting pipe; 18. Second limiting mechanism; 1801. Turntable; 1802. Bidirectional lead screw; 1803. First support plate; 1804. Second support plate; 1805. Irregular connecting plate; 1806. Limiting clamp; 19. Connecting column; 20. Upper connecting plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-4An industrial refrigeration machine vacuum testing device includes a test platform 1 and a test cover 6. The test platform 1 has a central through hole 2 inside, and a pressure guiding pipe 3 is installed inside the central through hole 2. The width of the central through hole 2 is wider than the pressure guiding pipe 3 that flows through the industrial refrigeration machine. A rubber plug 7 is installed on the inner top wall of the test cover 6. A first through hole 8 is opened inside the rubber plug 7. A vacuum pump 16 is installed on the upper surface of the test platform 1. The suction end of the vacuum pump 16 is fixedly connected to a connecting pipe 17. The end of the connecting pipe 17 away from the vacuum pump 16 is fixedly connected to the test cover 6. A vacuum tester 15 is installed inside the test cover 6. Both the vacuum tester 15 and the connecting pipe 17 are connected to the first through hole 8.

[0024] The pressure guiding tube 3 is provided with a plug 11 inside. The plug 11 has a second through hole 14 inside. The second through hole 14 is connected to the first through hole 8. The gas inside the pressure guiding tube 3 can be extracted through the first through hole 8 and the second through hole 14 by using the vacuum pump 16 and the connecting pipe 17. The gas leakage of the pressure guiding tube 3 can be detected by using the vacuum tester 15.

[0025] The upper surface of the plug 11 has a groove for the rubber plug 7 to fit. The outer surface of the rubber plug 7 is slidably connected to the groove on the upper surface of the plug 11. A rubber sleeve 13 is fixedly connected to the outer surface of the plug 11. The outer surface of the rubber sleeve 13 is slidably connected to the pressure guide tube 3. By using the rubber plug 7 and rubber sleeve 13 made of rubber, the airtightness of the rubber plug 7 when connected to the plug 11 and the rubber sleeve 13 when connected to the pressure guide tube 3 can be improved, thereby improving the accuracy of vacuum testing.

[0026] A cylindrical plate 12 is fixedly connected to the upper surface of the plug 11. The outer surface of the cylindrical plate 12 is slidably connected to the test cover 6. The outer upper edge of the cylindrical plate 12 is chamfered, so that the outer edge of the cylindrical plate 12 has an arc-shaped surface.

[0027] The test cover 6 is equipped with a first limiting mechanism 9, which includes a handle 901 and a tongue block 903. The outer surface of the tongue block 903 is in contact with the cylindrical plate 12. The lower left edge of the tongue block 903 is also provided with an arc surface, so that when a new plug 11 is installed, the cylindrical plate 12 can push the tongue block 903 open.

[0028] A support frame 4 is fixedly connected to the upper surface of the test bench 1. An electric push rod 5 is installed inside the support frame 4. An upper connecting plate 20 is fixedly connected to the output end of the electric push rod 5. Four connecting posts 19 are fixedly connected to the bottom surface of the upper connecting plate 20. The bottom surfaces of the four connecting posts 19 are all fixedly connected to the upper surface of the test cover 6. By using the four connecting posts 19 to connect the through hole 2 to the test cover 6, the view of the tester can be avoided when observing the vacuum tester 15.

[0029] The test cover 6 has a transverse limiting groove 10 inside. The outer surface of the tongue block 903 is slidably connected to the transverse limiting groove 10. A pull rod 902 is fixedly connected to the right side of the tongue block 903. The outer surface of the pull rod 902 is slidably connected to the test cover 6. A handle 901 is fixedly connected to the right end of the pull rod 902. By pulling the handle 901, the pull rod 902 and the tongue block 903 can be released from limiting the cylinder 12, so that the plug 11 can be removed and replaced. This is convenient for adapting to the pressure guide tube 3 of different models of industrial refrigeration machines. The setting of the tongue block 903 can pull the cylinder 12, so that the plug 11 and the rubber sleeve 13 can be easily pulled out from the inside of the pressure guide tube 3.

[0030] A spring 904 is fitted on the outer surface of the pull rod 902. The two ends of the spring 904 are fixedly connected to the tongue block 903 and the transverse limiting groove 10. By using the elastic force of the spring 904, the spring 904 can be reset and the cylinder 12 can be limited when a new plug 11 is installed.

[0031] The second limiting mechanism 18 includes a bidirectional lead screw 1802, a first support plate 1803, and a second support plate 1804. The top ends of the first support plate 1803 and the second support plate 1804 are fixedly connected to the bottom surface of the test bench 1. The bidirectional lead screw 1802 passes through the first support plate 1803 and extends to the outer surface of the second support plate 1804. The bidirectional lead screw 1802 is rotatably connected to the first support plate 1803 and the second support plate 1804 respectively. One end of the bidirectional lead screw 1802 is fixedly connected to a turntable 1801. Two irregularly shaped connecting plates 1805 are threadedly connected to the outer surface of the bidirectional lead screw 1802. By using the irregularly shaped connecting plates 1805, the turntable 1801, the bidirectional lead screw 1802, the first support plate 1803, the second support plate 1804, and the central through hole 2 can be misaligned to avoid interference with the pressure guide tube 3.

[0032] Limiting plates 1806 are fixedly connected to the upper surfaces of both irregularly shaped connecting plates 1805. The outer surfaces of both limiting plates 1806 are slidably connected to the central through hole 2, and both limiting plates 1806 are in contact with the outer surface of the pressure guiding pipe 3. Figure 2 and Figure 4 As shown, two protruding blocks are fixedly connected to the outer surface of the limiting clamp 1806, and two transverse slots are opened on the front and rear side walls of the central through hole 2, which can guide and limit the limiting clamp 1806.

[0033] Working principle: When performing a vacuum test on the pressure guide tube 3 of the industrial refrigeration unit, the pressure guide tube 3 is placed between two limiting clamps 1806. By rotating the turntable 1801, the bidirectional lead screw 1802 can be rotated, which in turn moves the two irregular connecting plates 1805 and the two limiting clamps 1806 closer together, thus clamping and limiting the pressure guide tube 3. By activating the electric push rod 5, the upper connecting plate 20, the four connecting posts 19, and the test cover 6 can be moved downwards, allowing the plug 11 and the rubber sleeve 13 to be inserted into the interior of the pressure guide tube 3. The vacuum pump 16 is then activated to perform a vacuuming operation. After completion, the vacuum pump 16 is turned off, and the vacuum status of the pressure guide tube 3 can be determined by observing the vacuum tester 15. After the test, restarting the electric push rod 5 will move the four connecting posts 19, the test cover 6, and the tongue block 903 upwards. This allows the tongue block 903 to pull the cylindrical plate 12, the plug 11, and the rubber sleeve 13, ultimately disengaging the plug 11 and the rubber sleeve 13 from the inside of the pressure guide tube 3. When vacuum testing is required on different models of pressure guide tubes 3, pulling the handle 901 will move the pull rod 902 and the tongue block 903, releasing the tongue block 903 from limiting the cylindrical plate 12, thus removing the plug 11 and the rubber sleeve 13 from the inside of the test cover 6. By inserting the cylindrical plate 12 on the new plug 11 into the interior of the test cover 6, the cylindrical plate 12 can push open the tongue block 903. After the cylindrical plate 12 moves above the tongue block 903, the tongue block 903 can be reset under the elastic force of the spring 904, so that the tongue block 903 can limit the cylindrical plate 12. The plug 11 and rubber sleeve 13 can be replaced according to the model of the pressure guide pipe 3 on the industrial refrigeration machine, thereby enhancing the applicability of the device.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An industrial chiller vacuum testing apparatus comprising a test bed (1) and a test cover (6), characterised in that: The inside of the test platform (1) is provided with a middle through hole (2), the inside of the middle through hole (2) is provided with a pressure guide pipe (3), the inner top wall of the test cover (6) is provided with a rubber plug (7), the inside of the rubber plug (7) is provided with a first through hole (8), the inside of the plug (11) is provided with a second through hole (14), the outer surface of the rubber plug (7) is slidably connected with the slotted upper surface of the plug (11), the upper surface of the plug (11) is fixedly connected with a cylinder piece (12), the outer surface of the cylinder piece (12) is slidably connected with the test cover (6), the inside of the test cover (6) is provided with a first limiting mechanism (9), the first limiting mechanism (9) comprises a handle (901) and a tongue-shaped block (903), the outer surface of the tongue-shaped block (903) is in contact with the cylinder piece (12), the outer surface of the plug (11) is fixedly connected with a rubber sleeve (13), the outer surface of the rubber sleeve (13) is slidably connected with the pressure guide pipe (3), the upper surface of the test platform (1) is provided with a vacuum pump (16), the suction end of the vacuum pump (16) is fixedly connected with a connecting pipe (17), the end of the connecting pipe (17) away from the vacuum pump (16) is fixedly connected with the test cover (6), and the inside of the test cover (6) is provided with a vacuum tester (15).

2. An industrial chiller vacuum testing apparatus as claimed in claim 1, wherein, The upper surface of the test platform (1) is fixedly connected with a stand (4), the inside of the stand (4) is provided with an electric push rod (5), the output end of the electric push rod (5) is fixedly connected with an upper connecting plate (20), the bottom surface of the upper connecting plate (20) is fixedly connected with four connecting columns (19), and the bottom surfaces of the four connecting columns (19) are fixedly connected with the upper surface of the test cover (6).

3. The industrial chiller vacuum testing apparatus of claim 1, wherein, The inside of the test cover (6) is provided with a transverse limiting groove (10), the outer surface of the tongue-shaped block (903) is slidably connected with the transverse limiting groove (10), the right side of the tongue-shaped block (903) is fixedly connected with a pull rod (902), the outer surface of the pull rod (902) is slidably connected with the test cover (6), and the right end of the pull rod (902) is fixedly connected with a handle (901).

4. An industrial chiller vacuum test apparatus as claimed in claim 3, wherein, The outer surface of the pull rod (902) is provided with a spring (904), and the two ends of the spring (904) are fixedly connected with the tongue-shaped block (903) and the transverse limiting groove (10).

5. The industrial chiller vacuum testing apparatus of claim 1, wherein, The second limiting mechanism (18) comprises a bidirectional screw rod (1802), a first supporting plate (1803) and a second supporting plate (1804), the top ends of the first supporting plate (1803) and the second supporting plate (1804) are fixedly connected with the bottom surface of the test platform (1), the bidirectional screw rod (1802) penetrates through the first supporting plate (1803) and extends to the outer surface of the second supporting plate (1804), and the bidirectional screw rod (1802) is rotatably connected with the first supporting plate (1803) and the second supporting plate (1804), respectively, and one end of the bidirectional screw rod (1802) is fixedly connected with a rotating disc (1801).

6. An industrial chiller vacuum testing apparatus as claimed in claim 5, wherein, The outer surface of the bidirectional screw rod (1802) is threadedly connected with two special-shaped connecting plates (1805), the upper surfaces of the two special-shaped connecting plates (1805) are fixedly connected with limiting clamping plates (1806), the outer surfaces of the two limiting clamping plates (1806) are slidably connected with the middle through holes (2), and the two limiting clamping plates (1806) are in contact with the outer surface of the guide pressure pipe (3).

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