A refrigerant filling device for a refrigerator

Abstract

The application discloses a refrigerant filling equipment for a refrigerating machine, which comprises a main machine, a control system, a refrigerant storage tank, a vacuum pump and a filling pipeline, and the end of the filling pipeline is connected with a double-layer self-adapting sealing joint assembly; the double-layer self-adapting sealing joint assembly comprises a base connected to the end of the filling pipeline, an outer cylinder assembly arranged on the base, and an inner cylinder assembly arranged on the base and coaxially arranged with the outer cylinder assembly; wherein the inner part of the outer cylinder assembly and the inner cylinder assembly is embedded with a variable-diameter framework, the variable-diameter framework comprises a plurality of spiral reinforcing wires and a plurality of adjusting rod assemblies uniformly distributed in the circumferential direction; the adjusting rod assembly is formed by sequentially and slidingly connecting a plurality of short sections, and a hinge joint is arranged between each short section and the spiral reinforcing wire, and the hinge joint allows the spiral reinforcing wire and the short section to relatively rotate.

Description

Technical Field

[0001] This invention relates to the field of refrigerant charging technology, specifically a refrigerant charging device for a refrigeration machine. Background Technology

[0002] Existing refrigerant charging equipment typically uses standard quick-connect fittings (such as 1 / 4-inch or 3 / 8-inch Hansen fittings) or simple radial clamping methods when connecting to refrigeration systems. These designs have significant limitations: firstly, when handling maintenance work with various pipe diameters, personnel must carry multiple charging hoses or adapters of different specifications, making the operation cumbersome; secondly, traditional radial clamping methods can cause deformation of flexible materials such as rubber hoses, leading to unreliable seals and potentially causing pipe damage or blockage. More importantly, existing equipment often clamps only from the outside of the pipe, lacking support for the inner wall of the hose, thus failing to achieve a truly reliable seal. Furthermore, vacuuming, leak detection, and charging functions often require manual switching, lacking integrated and automated control.

[0003] In recent years, although some variable-diameter clamping mechanisms have emerged, most of them adopt purely mechanical transmission methods, which have problems such as complex structure, uneven clamping force, and poor adaptability to hoses. Especially for soft pipes, simple external clamping cannot provide sufficient internal support, making it difficult to achieve a reliable seal.

[0004] Therefore, it is necessary to provide a refrigerant charging device for a refrigeration machine to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a refrigerant charging device for a refrigeration machine, comprising a main unit, a control system, a refrigerant storage tank, a vacuum pump, and a charging pipeline, wherein the end of the charging pipeline is connected to a double-layer adaptive sealing joint assembly; The dual-layer adaptive sealing joint assembly includes: A base, which is connected to the end of the filling pipeline; An outer cylinder assembly, which is disposed on the base; An inner cylinder assembly is disposed on the base and coaxially arranged with the outer cylinder assembly; The outer cylinder assembly and the inner cylinder assembly are both embedded with a variable diameter skeleton, which includes multiple spiral reinforcing wires and multiple adjusting rod assemblies evenly distributed along the circumference. The adjusting rod assembly is formed by a plurality of short sections that are slidably connected in sequence, and each of the short sections is provided with a hinge point between it and the spiral reinforcing wire. The hinge point allows relative rotation between the spiral reinforcing wire and the short section.

[0006] Preferably, a sleeve is fixedly provided at one end of each short section, and a sliding rod is fixedly provided at the other end. A sliding cavity is formed inside the sleeve. In two adjacent short sections, the sliding rod of one short section is sealed and slidably inserted into the sliding cavity of the sleeve of the other short section.

[0007] Preferably, the short section and the slide rod have through hydraulic channels inside, and multiple slide cavities in the same adjusting rod assembly are interconnected through the hydraulic channels.

[0008] Preferably, a first interface and a second interface are provided on the base, and the first interface and the second interface are offset along the axial direction of the base; The inner diameter of the first interface is larger than the maximum outer diameter of the inner cylinder assembly, and a first elastic baffle is sealingly connected between the first interface and the inner cylinder assembly. The inner diameter of the second interface is larger than the maximum outer diameter of the outer cylinder assembly, and a second elastic curtain is sealingly connected between the second interface and the outer cylinder assembly.

[0009] Preferably, both the first interface and the second interface have multiple L-shaped drive rods distributed circumferentially on their inner sides. Each L-shaped drive rod is slidably arranged radially, and one end of each drive rod is fixedly connected to the corresponding adjustment rod assembly, while the other end is fixedly provided with a guide rod. The base is rotatably provided with a first turntable and a second turntable. The first turntable corresponds to the position of the first interface, and the second turntable corresponds to the position of the second interface. Both the first turntable and the second turntable have multiple arc-shaped grooves opened along the circumference. Each guide rod in the first interface is slidably disposed in the arc-shaped groove at the corresponding position on the first turntable, and each guide rod in the second interface is slidably disposed in the arc-shaped groove at the corresponding position on the second turntable.

[0010] Preferably, the L-shaped drive rod has a hollow interior forming a fluid channel, which is connected to the hydraulic channel in the adjusting rod assembly.

[0011] Preferably, both the inner wall of the outer cylinder assembly and the outer wall of the inner cylinder assembly are provided with multiple annular sealing lips.

[0012] Preferably, the double-layer adaptive sealing connector integrates a pressure sensor.

[0013] Preferably, it also includes a three-way switching valve assembly, which is disposed inside the main unit or near the end of the charging pipeline. The common port of the three-way switching valve assembly is connected to the main channel formed inside the inner cylinder assembly in the double-layer adaptive sealing joint assembly, the vacuum port is connected to the vacuum pump, and the charging port is connected to the refrigerant storage tank.

[0014] Preferably, the main unit of the device is equipped with a flow meter, which is connected in series in the filling port pipeline of the three-way switching valve group.

[0015] Compared with the prior art, the present invention provides a refrigerant charging device for a refrigeration machine, which has the following advantages: 1. High-precision diameter change control achieved by dual composite drive: This invention adopts a composite control method that combines turntable drive and hydraulic drive. The turntable drive drives the L-shaped drive rod to move radially through the arc groove, realizing rapid coarse adjustment of the diameter change frame; the hydraulic drive drives the slide rod to slide along the slide cavity by injecting hydraulic medium into the hydraulic channel, realizing precise fine adjustment of the length of the adjusting rod assembly. This combination of coarse and fine adjustment ensures both the speed of diameter change and high-precision positioning control.

[0016] 2. Hydraulic drive achieves uniform distribution of clamping force: Multiple sliding cavities in the same adjusting rod assembly are connected through hydraulic channels. When hydraulic medium is injected, the pressure in each sliding cavity is equal, thereby ensuring that the sliding distance between each short section is uniform and the overall force of the adjusting rod assembly is balanced. This characteristic ensures that the variable diameter skeleton always maintains a regular cylindrical shape during deformation, the clamping force is evenly distributed, and local stress concentration is avoided.

[0017] 3. Excellent sealing performance of hose material: The double-fit structure of inner and outer cylinders is adopted - the outer wall of the inner cylinder fits the inner wall of the pipe, and the inner wall of the outer cylinder fits the outer wall of the pipe, which fundamentally solves the hose connection problem. The uniform clamping force driven by hydraulics ensures that the hose is subjected to uniform force in the circumferential direction, and will not produce local indentations or deformation. The design of the annular sealing lip further enhances the sealing effect. Even if there are slight unevenness on the surface of the pipe, a reliable seal can be achieved through the elastic deformation of the sealing lip.

[0018] 4. Clamping force is perceptible and adjustable: The hydraulic control system can sense the clamping force in real time by monitoring the pressure of the hydraulic medium. The control system can automatically adjust the amount of hydraulic medium injected according to the material and wall thickness of the connected pipe to achieve precise control of the clamping force.

[0019] 5. Integrated Functional Design: Through the design of the three-way switching valve group, this invention integrates the vacuuming and filling functions into the same channel, realizing automatic process switching. The integration of the pressure sensor enables precise control of the vacuuming process, the pressure holding test function can automatically detect leakage, and the closed-loop control of the flow meter ensures the accuracy of the filling amount and eliminates human error. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the double-layer adaptive sealing joint assembly in this invention; Figure 3 This is a schematic diagram of the base structure in this invention; Figure 4 This is a schematic diagram of the inner cylinder assembly in this invention; Figure 5 This is a schematic diagram of the outer cylinder assembly in this invention; Figure 6 This is a schematic diagram of the variable diameter skeleton in this invention; Figure 7 This is a schematic diagram of the adjusting rod assembly in this invention; In the diagram: 100, Main unit; 200, Double-layer adaptive sealing joint assembly; 1, Filling pipeline; 2, Base; 21, First interface; 22, Second interface; 23, L-shaped drive rod; 231, Guide rod; 232, Fluid channel; 24, First turntable; 25, Second turntable; 26, Arc groove; 3, Outer cylinder assembly; 31, Second elastic baffle; 32, Outer cylinder annular sealing lip; 4, Inner cylinder assembly; 41, First elastic baffle; 42, Inner cylinder annular sealing lip; 5, Variable diameter skeleton; 51, Spiral reinforcing wire; 52, Adjusting rod assembly; 521, Short section; 522, Sleeve; 523, Slide rod; 524, Hydraulic channel. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Example 1

[0022] Please see Figures 1 to 7 In this embodiment of the invention, a refrigerant charging device for a refrigeration machine includes a main unit 100, a control system, a refrigerant storage tank, a vacuum pump, and a charging pipeline 1. The end of the charging pipeline 1 is connected to a double-layer adaptive sealing joint assembly 200.

[0023] The double-layer adaptive sealing joint assembly 200 includes a base 2, an outer cylinder assembly 3, and an inner cylinder assembly 4. The base 2 is a hollow cylindrical structure, with its rear end connected to the end of the filling pipeline 1. The front end of the base 2 is provided with a coaxial first interface 21 and a second interface 22, which are used to install the inner cylinder assembly 4 and the outer cylinder assembly 3, respectively.

[0024] Both the inner cylinder assembly 4 and the outer cylinder assembly 3 are cylindrical structures made of hydrogenated nitrile rubber, which has good resistance to refrigerant corrosion and elasticity. The outer wall of the inner cylinder assembly 4 and the inner wall of the outer cylinder assembly 3 are provided with multiple annular sealing lips to form multiple seals with the inner and outer walls of the connected pipes. The initial outer diameter of the inner cylinder assembly 4 is 4.5 mm and the maximum expansion outer diameter is 15.5 mm; the initial inner diameter of the outer cylinder assembly 3 is 16.5 mm and the minimum contraction inner diameter is 5.5 mm, which can cover the 5-16 mm pipe diameter range commonly found in refrigeration equipment.

[0025] Both the inner cylinder assembly 4 and the outer cylinder assembly 3 are equipped with a variable diameter skeleton 5. The variable diameter skeleton 5 includes two spiral reinforcing wires 51 and six sets of adjusting rod assemblies 52 evenly distributed along the circumference. The spiral reinforcing wires 51 are made of stainless steel wire, and each set of adjusting rod assemblies 52 is formed by multiple short sections 521 connected in sequence.

[0026] Each of the short sections 521 has a sleeve 522 fixedly installed at one end and a slide rod 523 fixedly installed at the other end. A sliding cavity is formed inside the sleeve 522. In the adjusting rod assembly 52, multiple short sections 521 are connected end to end in sequence. In two adjacent short sections 521, the slide rod 523 of one short section 521 is slidably inserted into the sliding cavity of the sleeve 522 of the other short section 521. In this way, multiple short sections 521 form a telescopic chain structure through the cooperation of the sleeve 522 and the slide rod 523.

[0027] The short section 521 and the slide rod 523 have a through hydraulic channel 524. In the same adjusting rod assembly 52, the sliding cavities of adjacent short sections 521 are interconnected through the hydraulic channel 524, forming a continuous hydraulic passage extending along the entire adjusting rod assembly 52. ​​When hydraulic medium is injected into the hydraulic passage, the pressure in each sliding cavity increases synchronously, driving each slide rod 523 to slide outward along the corresponding sliding cavity, thereby extending the entire adjusting rod assembly 52. ​​When the hydraulic medium is withdrawn, each slide rod 523 slides inward, causing the adjusting rod assembly 52 to shorten.

[0028] Each short section 521 is provided with a hinge point 53 between itself and the spiral reinforcing wire 51. In this embodiment, the hinge point 53 adopts a micro ball joint structure, which allows relative rotation between the spiral reinforcing wire 51 and the short section 521 in three-dimensional space.

[0029] The base 2 is provided with a first interface 21 and a second interface 22, which are offset from each other along the axial direction of the base 2. The inner diameter of the first interface 21 is larger than the maximum outer diameter of the inner cylinder assembly 4. A first elastic curtain 4161 is sealed between the first interface 21 and the inner cylinder assembly 4. The inner diameter of the second interface 22 is larger than the maximum outer diameter of the outer cylinder assembly 3. A second elastic curtain 3162 is sealed between the second interface 22 and the outer cylinder assembly 3. The first elastic curtain 4161 and the second elastic curtain 3162 are made of highly elastic rubber, which allows the inner cylinder assembly 4 and the outer cylinder assembly 3 to freely expand and contract in the radial direction while maintaining a seal with the base 2.

[0030] The inner sides of the first interface 21 and the second interface 22 are each provided with six L-shaped drive rods 23 distributed circumferentially. Each L-shaped drive rod 23 is slidably disposed in the guide groove of the base 2. One end of the drive rod 23 is fixedly connected to the corresponding adjusting rod assembly 52, and the other end is fixedly provided with a guide rod 231. The L-shaped drive rod 23 has a hollow interior forming a fluid channel 232, which is connected to the hydraulic channel 524 in the adjusting rod assembly 52.

[0031] The base 2 is rotatably equipped with a first turntable 24 and a second turntable 25. The first turntable 24 corresponds to the position of the first interface 21, and the second turntable 25 corresponds to the position of the second interface 22. The first turntable 24 and the second turntable 25 can be driven in various ways, such as by direct drive with a micro motor or by a hydraulic drive structure (the rotation of the turntable is a back-and-forth rotation within a certain angle range). Both the first turntable 24 and the second turntable 25 have multiple arc-shaped grooves 26 opened along the circumference. Each guide rod 231 in the first interface 21 is slidably disposed in the arc-shaped groove 26 at the corresponding position on the first turntable 24, and each guide rod 231 in the second interface 22 is slidably disposed in the arc-shaped groove 26 at the corresponding position on the second turntable 25.

[0032] This embodiment also includes a hydraulic control system, which includes a hydraulic pump, a hydraulic valve group, and hydraulic lines. The hydraulic lines are connected to the fluid channel 232 of the L-shaped drive rod 23, and then connected to the hydraulic channel 524 of the adjusting rod assembly 52. ​​The hydraulic control system is controlled by the control system. By injecting or extracting hydraulic medium (such as hydraulic oil) into or from the hydraulic channel 524 of the adjusting rod assembly 52, the slide rod 523 is driven to slide along the sliding cavity, thereby realizing the extension and retraction adjustment of the adjusting rod assembly 52.

[0033] When the first turntable 24 rotates, the arc-shaped groove 26 drives the guide rod 231 and the L-shaped drive rod 23 to move radially, thereby driving the overall radial movement of the adjusting rod assembly 52 to coarsely adjust the variable diameter skeleton 5 to approach the target pipe diameter. At the same time, the hydraulic control system injects hydraulic medium into the hydraulic channel 524, causing the pressure in each slide cavity to rise synchronously, driving the slide rod 523 of each short section 521 to slide outward along the corresponding slide cavity, thereby making the entire adjusting rod assembly 52 uniformly elongate. Conversely, when the hydraulic medium is withdrawn, each slide rod 523 slides inward synchronously, making the adjusting rod assembly 52 uniformly shorten. By controlling the amount of hydraulic medium injected, the overall length of the adjusting rod assembly 52 can be precisely controlled, realizing fine adjustment and precise locking of the variable diameter skeleton. Through the coordinated control of the turntable drive and the hydraulic drive, high-precision adjustment of the variable diameter skeleton 5 can be achieved.

[0034] The double-layer adaptive sealing joint assembly 200 integrates a pressure sensor for real-time monitoring of the pressure at the connection point. The pressure sensor is connected to the main channel inside the inner cylinder assembly 4 through an internal channel.

[0035] The main unit 100 of the equipment is equipped with a three-way switching valve group and a flow meter (not shown in the figure). The common port of the three-way switching valve group is connected to the main channel formed inside the inner cylinder assembly 4 through the filling pipeline 1. The vacuum port is connected to the vacuum pump. The filling port is connected to the refrigerant storage tank after the flow meter is connected in series. The control system controls the switching of the three-way switching valve group and the start and stop of the vacuum pump according to the feedback of the pressure sensor, and controls the opening and closing of the filling valve according to the feedback of the flow meter to achieve precise filling.

[0036] The workflow of this embodiment is as follows: Connection stage: The operator inserts the end of the connecting pipe of the equipment to be filled into the annular space between the inner cylinder assembly 4 and the outer cylinder assembly 3. The control system calculates the required rotation angle of the first turntable 24 and the second turntable 25, as well as the hydraulic medium injection volume required by the hydraulic control system, based on the pipe diameter parameters input by the user or by automatically detecting the pipe diameter through the built-in laser rangefinder.

[0037] Adaptive dual clamping: The control system activates the drive structure of the first turntable 24 and the second turntable 25. The first turntable 24 rotates, driving the L-shaped drive rod 23 and the adjusting rod assembly 52 in the inner cylinder assembly 4 to move radially towards the center through the arc groove 26; simultaneously, the second turntable 25 rotates, driving the adjusting rod assembly 52 in the outer cylinder assembly 3 to move radially towards the center. The radial movement of the adjusting rod assembly 52 forces the spiral reinforcing wire 51 to axially extend and retract through the hinge point 53. When the turntable drive brings the skeleton close to the target pipe diameter, the hydraulic control system is activated. Hydraulic medium is injected into each slide cavity through hydraulic channels 524 and 524, driving slide rod 523 to slide along the slide cavity, and fine-tuning the length of adjusting rod assembly 52 to achieve precise locking. Finally, the outer wall of inner cylinder assembly 4 expands outward to fit tightly against the inner wall of the connected pipe, and the inner wall of outer cylinder assembly 3 contracts inward to fit tightly against the outer wall of the connected pipe, forming a double-fit seal. The annular sealing lip undergoes elastic deformation under pressure, further filling the micro gap. The hydraulic control system can sense the magnitude of the clamping force in real time by monitoring the pressure of the hydraulic medium to ensure that the clamping force is appropriate.

[0038] Vacuuming and Leak Detection: After the double sealing is completed, the control system switches the three-way switching valve group to the vacuum port connection state, starts the vacuum pump, and evacuates the connecting pipes and the inside of the refrigeration equipment through the channel inside the inner cylinder assembly 4. The pressure sensor monitors the vacuum level changes in real time. After the set vacuum level is reached, the valve is closed, and the system enters the pressure holding test stage. The system monitors the pressure rise value within 3 minutes. If the rise value exceeds the preset threshold, it is determined to be a leak, and an audible and visual alarm is issued.

[0039] Precise charging: After confirming no leakage, the control system switches the three-way switching valve group to the charging port connection state, opens the outlet valve of the refrigerant storage tank, and the refrigerant flows into the refrigeration equipment through the channel inside the inner cylinder assembly 4. The flow meter monitors the cumulative flow in real time. When the preset charging amount is reached (or the dynamic target value after correction according to parameters such as ambient temperature and connecting pipe length), the control system automatically closes the valve to complete the charging.

[0040] Disengagement phase: After filling is completed, the hydraulic control system reverses its action, extracts the hydraulic medium, and resets the slide bar 523; at the same time, the first turntable 24 and the second turntable 25 rotate in opposite directions, the adjusting rod assembly 52 moves radially outward, the spiral reinforcing wire 51 resets, the inner cylinder assembly 4 and the outer cylinder assembly 3 are released, and the operator can easily pull out the connecting pipe. All data of the entire process (time, pipe diameter, clamping force, vacuum degree, leakage rate, filling volume, etc.) are recorded and stored in the control system and can be exported through the data interface. Example 2

[0041] This embodiment is basically the same as Embodiment 1, except that: in this embodiment, the hydraulic control system uses pneumatic drive instead of hydraulic drive, that is, the slide bar 523 is driven by injecting compressed air into the hydraulic channel 524. Pneumatic drive has the advantages of fast response speed and no pollution, and is suitable for occasions with high cleanliness requirements. Example 3

[0042] This embodiment is basically the same as Embodiment 1, except that: in this embodiment, the hydraulic control system also has a clamping force feedback function. The pressure sensor (not shown in the figure) in the hydraulic channel 524524 monitors the pressure of the hydraulic medium in real time. The control system calculates the clamping force according to the pressure value and compares it with the preset safety threshold. When the clamping force exceeds the upper limit, the control system automatically adjusts the injection amount of the hydraulic medium to prevent the clamping force from being too large and damaging the connected pipe. When the clamping force is lower than the lower limit, the system automatically replenishes the pressure to ensure reliable sealing.

[0043] In summary, this invention solves the technical challenges faced by existing refrigerant filling equipment when dealing with various pipe diameters, especially hose connections, through its innovative internal and external double-layer adaptive sealing structure, rotary table and hydraulic composite drive method, and integrated functional design, thus achieving efficient, reliable, and intelligent refrigerant filling operations.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A refrigerant charging device for a refrigeration machine, comprising a main unit, a control system, a refrigerant storage tank, a vacuum pump, and charging pipelines (1), characterized in that, The end of the filling pipeline (1) is connected to a double-layer adaptive sealing joint assembly; The dual-layer adaptive sealing joint assembly includes: The base (2) is connected to the end of the filling pipeline (1); The outer cylinder assembly (3) is disposed on the base (2); Inner cylinder assembly (4), which is disposed on the base (2) and coaxially disposed with the outer cylinder assembly (3); The outer cylinder assembly (3) and the inner cylinder assembly (4) are both equipped with a variable diameter skeleton (5), which includes multiple spiral reinforcing wires (51) and multiple adjusting rod assemblies (52) evenly distributed along the circumference. The adjusting rod assembly (52) is formed by a plurality of short sections (521) connected in sequence, and each short section (521) is provided with a hinge point between it and the spiral reinforcing wire (51), the hinge point allowing relative rotation between the spiral reinforcing wire (51) and the short section (521).

2. The refrigerant charging device for a refrigeration machine according to claim 1, characterized in that, Each of the short sections (521) has a sleeve (522) fixedly provided at one end and a slide rod (523) fixedly provided at the other end. A sliding cavity is formed inside the sleeve (522). In two adjacent short sections (521), the slide rod (523) of one short section (521) is sealed and slidably inserted into the sliding cavity of the sleeve (522) of the other short section (521).

3. The refrigerant charging device for a refrigeration machine according to claim 2, characterized in that, The short section (521) and the slide rod (523) have through hydraulic channels inside, and multiple slide cavities in the same adjusting rod assembly (52) are interconnected through the hydraulic channels.

4. The refrigerant charging device for a refrigeration machine according to claim 3, characterized in that, A first interface (21) and a second interface (22) are provided on the base (2), and the first interface (21) and the second interface (22) are offset along the axial direction of the base (2); The inner diameter of the first interface (21) is larger than the maximum outer diameter of the inner cylinder assembly (4), and a first elastic curtain is sealed between the first interface (21) and the inner cylinder assembly (4); The inner diameter of the second interface (22) is larger than the maximum outer diameter of the outer cylinder assembly (3), and a second elastic curtain is sealed between the second interface (22) and the outer cylinder assembly (3).

5. A refrigerant charging device for a refrigeration machine according to claim 4, characterized in that, Both the first interface (21) and the second interface (22) have multiple L-shaped drive rods (23) distributed circumferentially on their inner sides. Each L-shaped drive rod (23) is slidably arranged radially, and one end of it is fixedly connected to the corresponding adjustment rod assembly (52), while the other end is fixedly provided with a guide rod (231). The base (2) is rotatably provided with a first turntable (24) and a second turntable (25). The first turntable (24) corresponds to the position of the first interface (21), and the second turntable (25) corresponds to the position of the second interface (22). Both the first turntable (24) and the second turntable (25) have multiple arc-shaped grooves (26) opened along the circumference. Each guide rod (231) in the first interface (21) is slidably disposed in the arc-shaped groove (26) at the corresponding position on the first turntable (24), and each guide rod (231) in the second interface (22) is slidably disposed in the arc-shaped groove (26) at the corresponding position on the second turntable (25).

6. A refrigerant charging device for a refrigeration machine according to claim 5, characterized in that, The L-shaped drive rod (23) has a hollow interior forming a fluid channel, which is connected to the hydraulic channel in the adjusting rod assembly (52).

7. A refrigerant charging device for a refrigeration machine according to claim 1, characterized in that, The inner wall of the outer cylinder assembly (3) and the outer wall of the inner cylinder assembly (4) are both provided with multiple annular sealing lips.

8. A refrigerant charging device for a refrigeration machine according to claim 1, characterized in that, The double-layer adaptive sealing connector integrates a pressure sensor.

9. A refrigerant charging device for a refrigeration machine according to claim 1, characterized in that, It also includes a three-way switching valve assembly, which is located inside the main unit or near the charging pipeline (1). The common port of the three-way switching valve assembly is connected to the main channel formed inside the inner cylinder assembly (4) in the double-layer adaptive sealing joint assembly. The vacuum port is connected to the vacuum pump, and the charging port is connected to the refrigerant storage tank.

10. A refrigerant charging device for a refrigeration machine according to claim 9, characterized in that, The main unit of the equipment is equipped with a flow meter, which is connected in series to the filling port pipeline of the three-way switching valve group.

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