A chiller refrigerant filling machine and method

Abstract

The present application relates to refrigerant filling device technical field, specifically disclose a kind of refrigeration machine refrigerant filling machine and filling method, including reciprocating thrust assembly and filling assembly, filling assembly includes the container of inside hollow and the slider sliding in container inner cavity, slider divides container inner cavity into gas cavity and liquid cavity, one side of slider and the one end of piston rod are connected, the other end of piston rod can be slidably extended to container outside, first interface is opened in container, and second interface and third interface are opened in container, fifth interface is opened in slider, and fifth interface and the one end of clamping pipe are connected, the inner diameter of clamping pipe gradually decreases along the direction away from slider, clamping pipe is equipped with obturator, and the present refrigeration machine uses extrusion mode to fill refrigerant, improves filling precision, and the present refrigeration machine refrigerant filling method is simple in operation, and reduces refrigerant leakage.

Description

Technical Field

[0001] This invention relates to the field of refrigerant charging equipment, specifically to a refrigerant charging machine and charging method for a refrigeration system. Background Technology

[0002] A refrigeration machine uses electrical energy to force heat from a low-temperature environment to a high-temperature environment. A refrigeration machine includes a compressor, condenser, throttling mechanism, evaporator, and high-pressure and low-pressure pipelines. Deviations in the refrigerant charge and residual moisture in the pipelines can affect the refrigeration efficiency of the machine.

[0003] Existing refrigerant filling equipment quantitatively fills refrigerant by weighing during operation. During the filling process, the tank containing refrigerant is placed on the weighing equipment and weighed. Then, the refrigerant is filled. After filling, the tank is weighed again. The difference between the two weighings is the refrigerant filling weight. However, due to limitations such as the accuracy of the weighing equipment, the refrigerant filling weight has a large error, and the filling accuracy is not good. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a refrigerant filling machine and filling method for a refrigeration machine. The refrigerant filling of the present refrigeration machine adopts the method of extrusion filling of refrigerant to improve the filling accuracy, and there are no gas phase cavitation bubbles in the filled liquid refrigerant, avoiding the flow and pressure jumps caused by gas-liquid alternation. The refrigerant filling method of the present refrigeration machine is simple to operate, reduces refrigerant leakage, and improves the filling accuracy of the refrigerant filling machine of the present refrigeration machine.

[0005] The technical solution adopted by this invention to solve its technical problem includes: On one hand, a refrigerant filling machine for a refrigeration system is provided, including a reciprocating thrust assembly and a filling assembly. The filling assembly includes a hollow container and a sliding member that slides within the container cavity. The sliding member divides the container cavity into a gas cavity and a liquid cavity. One side of the sliding member is connected to one end of a piston rod, and the other end of the piston rod extends slidably to the outside of the container. The container has a first interface communicating with the gas cavity, and a second interface and a third interface communicating with the liquid cavity.

[0006] The sliding member has a fifth interface that connects the gas chamber and the liquid chamber. The fifth interface is connected to one end of the retaining tube. The inner diameter of the retaining tube gradually decreases in the direction away from the sliding member. A sealing element is provided inside the retaining tube.

[0007] The reciprocating thrust assembly includes a fixed component and a moving component. The moving component of the reciprocating thrust assembly is connected to the piston rod at one end outside the container. The moving component of the reciprocating thrust assembly is used to drive the sliding member to reciprocate in a preset direction within the container cavity.

[0008] Wherein, the average density of the sealing component is less than the density of the liquid refrigerant, and when the sealing component is pressed against the fifth interface or the inner wall of the clamping pipe, no flow of liquid refrigerant or gaseous refrigerant occurs between the gas chamber and the liquid chamber.

[0009] As a preferred embodiment of the present invention, a heating component is installed on the container at the position corresponding to the liquid cavity.

[0010] As a preferred embodiment of the present invention, the heating component is installed on one end face of the container, a driving mechanism is installed on the container near the heating component, a first magnetic component is installed on the output shaft of the driving mechanism, a second magnetic component that rotates magnetically attracted to the first magnetic component is installed in the liquid cavity away from the sliding component, and a swinging component that slides against the inner wall of the liquid cavity is installed on the second magnetic component.

[0011] As a preferred embodiment of the present invention, the sealing component includes a first half-shell and a second half-shell that can fit together, and the first half-shell and the second half-shell are provided with matching annular contact surfaces.

[0012] The first half-shell annular contact surface and the second half-shell annular contact surface are brought together and assembled into a closed hollow shell, and a counterweight is installed on the inner wall of the second half-shell.

[0013] As a preferred embodiment of the present invention, the reciprocating thrust assembly is a servo electric cylinder, a hydraulic cylinder, or a linear motor, and the fixed component and the container of the reciprocating thrust assembly are connected by a support frame.

[0014] As a preferred embodiment of the present invention, a pressure sensor is installed between the moving part of the reciprocating thrust assembly and one end of the piston rod.

[0015] As a preferred embodiment of the present invention, the container includes a circular cylindrical body with openings at both ends, and a first end cap and a second end cap are respectively installed on the two openings of the cylindrical body.

[0016] As a preferred embodiment of the present invention, the container is provided with a fourth interface that communicates with the gas chamber.

[0017] On the other hand, a refrigerant charging method for a refrigeration machine is also provided, applicable to any of the aforementioned refrigerant charging machines, comprising the following steps: The refrigeration machine refrigerant filling machine is used in conjunction with a refrigerant storage tank, which is equipped with a liquid refrigerant control valve and a gaseous refrigerant control valve.

[0018] Install a liquid discharge control valve on the third port of the container.

[0019] Refrigerant injection into the container: Close both the liquid refrigerant control valve and the gaseous refrigerant control valve on the refrigerant storage tank, and make the liquid chamber higher than the gas chamber. Connect the first port on the container to the gaseous refrigerant control valve on the refrigerant storage tank through a pipeline, connect the second port on the container to the liquid refrigerant control valve on the refrigerant storage tank through a pipeline, and connect the liquid outlet control valve on the third port to the inlet of the vacuum pump through a pipeline. Then open the liquid outlet control valve, evacuate the gas chamber, liquid chamber, and each pipeline, and maintain the pressure for more than 10 minutes. Then close the liquid outlet control valve, make the gas chamber higher than the liquid chamber, make the refrigerant storage tank higher than the container, and open the liquid refrigerant control valve and the gaseous refrigerant control valve.

[0020] Preparations before refrigerant charging: Both the liquid refrigerant control valve and the gaseous refrigerant control valve are in the open position. The reciprocating thrust assembly drives the sliding part to move upward in the container through the piston rod, so that the electronic expansion valve of the refrigeration unit opens and the refrigeration unit is evacuated. Then, the liquid outlet control valve on the third interface and the charging valve of the refrigeration unit are connected by the charging pipe. The air in the pipeline between the liquid outlet control valve and the charging valve of the refrigeration unit is purged with liquid refrigerant.

[0021] Refrigerant charging: Close the liquid refrigerant control valve and open the gaseous refrigerant control valve. The reciprocating thrust assembly drives the sliding part to move downward a set distance in the container through the piston rod. Then disconnect the charging pipe from the charging valve of the refrigeration unit.

[0022] As a preferred embodiment of the present invention, a heating component is fitted onto the container at a position corresponding to the liquid cavity.

[0023] In the later stages of refrigerant charging, close the gaseous refrigerant control valve and the liquid refrigerant control valve to enable the heating components to operate.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. The refrigerant filling machine of the refrigeration mechanism of the present invention has a small pressure difference on both sides of the sliding member during the refrigerant filling process, which avoids the leakage of liquid refrigerant in the liquid chamber through the gap between the sliding member and the container, and there are no gas phase cavitation bubbles in the filled liquid refrigerant, which avoids the flow and pressure jump caused by gas-liquid alternation, thereby improving the filling accuracy of the refrigerant filling machine of the refrigeration mechanism.

[0025] 2. In the refrigerant filling machine of the refrigeration mechanism of the present invention, in the later stage of refrigerant filling, a portion of the refrigerant in the liquid chamber vaporizes. The gaseous refrigerant produced by vaporization causes the pressure in the liquid chamber and the gas chamber to increase slowly, thereby achieving precise control of the refrigerant filling amount.

[0026] 3. In the refrigerant filling machine of the refrigeration mechanism of the present invention, the oscillating component rotates, and the rotating oscillating component sweeps the air bubbles generated in the liquid chamber when the heating component is working away from the inner wall of the liquid chamber, so as to prevent the air bubbles from entering the third interface and improve the refrigerant filling accuracy.

[0027] 4. The refrigerant filling machine of the refrigeration machine of the present invention is simple to operate, reduces refrigerant leakage, and improves the filling accuracy of the refrigerant filling machine of the refrigeration machine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention from one perspective; Figure 2 This is a schematic diagram of the structure of the present invention from another perspective; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a partial cross-sectional view of the container structure of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the sealing component structure of the present invention.

[0029] In the diagram: 1 Reciprocating thrust assembly, 2 Pressure sensor, 3 Support frame, 4 Injection assembly, 401 Piston rod, 402 First interface, 403 Container, 4031 First end cap, 4032 Cylinder, 4033 Second end cap, 404 Second interface, 405 Third interface, 406 Fourth interface, 407 Sliding component, 408 Gas chamber, 409 Liquid chamber, 5 Drive mechanism, 6 First magnetic component, 7 Heating assembly, 8 Swinging component, 9 Sealing component, 901 First half-shell, 902 Counterweight, 903 Second half-shell, 10 Second magnetic component, 11 Connecting pipe, 12 Fifth interface. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0031] Example 1: Please see Figures 1-5This embodiment discloses a refrigerant filling machine for a refrigeration system, including a reciprocating thrust assembly 1 and a filling assembly 4. The filling assembly 4 includes a hollow cylindrical container 403 and a sliding member 407 that can slide within the inner cavity of the container 403. The sliding member 407 divides the inner cavity of the container 403 into a gas cavity 408 and a liquid cavity 409. A piston rod through hole is provided on one end face of the container 403 corresponding to the gas cavity 408. One side of the sliding member 407 is fixedly connected to one end of the piston rod 401. The other end of the piston rod 401 passes through the piston rod through hole and extends to the outside of the container 403. A sealing gasket is installed on the inner wall of the piston rod through hole. A first interface 402 communicating with the gas cavity 408 is provided on the container 403. A second interface 404 and a third interface 405 communicating with the liquid cavity 409 are provided on the container 403.

[0032] The sliding member 407 has a fifth interface 12 that connects the gas chamber 408 and the liquid chamber 409. The fifth interface 12 is connected to one end of the retaining tube 11. The inner diameter of the retaining tube 11 gradually decreases in the direction away from the sliding member 407. The retaining tube 11 has a sealing member 9 inside. The fifth interface 12 and the retaining tube 11 prevent the sealing member 9 from entering the gas chamber 408 and the liquid chamber 409.

[0033] The reciprocating thrust assembly 1 includes a fixed component and a moving component. The fixed component of the reciprocating thrust assembly 1 is connected to the outside of the container 403 via a support frame 3. The moving component of the reciprocating thrust assembly 1 is connected to the end of the piston rod 401 located outside the container 403 via a retaining ring, a retaining pin, or a threaded sleeve. The moving component of the reciprocating thrust assembly 1 is used to drive the sliding member 407 to reciprocate in a preset direction within the cavity of the container 403 via the piston rod 401.

[0034] Among them, the average density of the sealing component 9 is less than the density of the liquid refrigerant. When the sealing component 9 is pressed against the fifth interface 12 or the inner wall of the clamping pipe 11, no flow of liquid refrigerant or gaseous refrigerant occurs between the gas chamber 408 and the liquid chamber 409.

[0035] The working process and principle of this embodiment are as follows: This refrigeration machine refrigerant filling machine is used in conjunction with an external refrigerant storage tank. The external refrigerant storage tank is equipped with an external liquid refrigerant control valve and an external gaseous refrigerant control valve. During the refrigerant filling process, the liquid refrigerant control valve is located on the bottom side of the refrigerant storage tank, and the gaseous refrigerant control valve is located on the top side of the refrigerant storage tank. An external liquid outlet control valve is installed on the third port 405 of container 403.

[0036] Initial refrigerant injection into container 403: The operator closes both the liquid and gaseous refrigerant control valves. The first port 402 of container 403 is lower than the second port 404. The piston rod 401 moves vertically. The first port 402 on container 403 is connected to the gaseous refrigerant control valve on the refrigerant storage tank via a pipeline. The second port 404 on container 403 is connected to the liquid refrigerant control valve on the refrigerant storage tank via a pipeline. The liquid outlet control valve on the third port 405 is connected to the inlet of an external vacuum pump via a pipeline. The operator opens the liquid outlet control valve and uses the vacuum pump to evacuate the gas chamber 408, liquid chamber 409, and all pipelines. After holding the pressure for at least 10 minutes, the operator closes the liquid outlet control valve, disconnects the pipeline connection between the vacuum pump and the liquid outlet control valve, and rotates the refrigerant filling machine of this refrigeration unit so that the first port 402 of container 403 is higher than the second port 404 of container 403. The piston rod 401 moves in a vertical direction. The operator raises the refrigerant storage tank higher than container 403, opens the liquid refrigerant control valve and the gaseous refrigerant control valve, and the liquid refrigerant in the refrigerant storage tank flows into the liquid chamber 409, and the gaseous refrigerant in the refrigerant storage tank flows into the gas chamber 408. The sealing component 9 prevents the gaseous refrigerant in the liquid chamber 409 from entering the gas chamber 408.

[0037] Preparation before refrigerant charging: The operator opens both the liquid refrigerant control valve and the gaseous refrigerant control valve. The reciprocating thrust assembly 1, via the piston rod 401, drives the sliding member 407 upward within the container 403, reducing the volume of the gas chamber 408 and increasing the volume of the liquid chamber 409. Liquid refrigerant is drawn into the liquid chamber 409. Then, the operator opens the electronic expansion valve of the refrigeration unit to ensure the high and low pressure lines of the refrigeration unit are connected. The operator then uses an external vacuum pump to evacuate the refrigeration unit. Vacuum is created to bring the vacuum level inside the refrigeration unit to a preset value and maintain it stably. Then, the operator uses the filling pipe to connect the liquid outlet control valve on the third interface 405 to the charging valve of the refrigeration unit. The operator loosens the connection between the filling pipe and the charging valve of the refrigeration unit, opens the liquid outlet control valve slightly for 1-3 seconds, and uses liquid refrigerant to purge the air in the pipe between the liquid outlet control valve and the charging valve of the refrigeration unit. Then, the connection between the filling pipe and the charging valve of the refrigeration unit is restored to a firm position, thus purging the filling pipe.

[0038] Refrigerant charging: The operator closes the liquid outlet control valve, the liquid refrigerant control valve, and the gaseous refrigerant control valve. The reciprocating thrust assembly 1 drives the sliding member 407 to move downward in the container 403 via the piston rod 401, thereby discharging the gaseous refrigerant in the liquid chamber 409. Then, the liquid outlet control valve is opened, and the reciprocating thrust assembly 1 drives the sliding member 407 to move downward a set distance in the container 403 via the piston rod 401. The moving sliding member 407 causes the liquid refrigerant in the liquid chamber 409 to enter the pipeline of the refrigeration machine through the third interface 405, the charging pipe, and the charging valve of the refrigeration machine, completing the charging of the preset volume of liquid refrigerant into the pipeline of the refrigeration machine. Then, the charging pipe and the charging valve of the refrigeration machine are disconnected.

[0039] The process involves two steps: refrigerant preparation and refrigerant charging. Refrigerant is charged sequentially to multiple refrigeration units.

[0040] In this refrigeration machine, the pressure difference between the two sides of the sliding member 407 is small during the refrigerant filling process, which reduces the leakage of liquid refrigerant in the liquid chamber 409 through the gap between the sliding member 407 and the container 403, thereby improving the filling accuracy of the refrigerant filling machine.

[0041] The average density of the sealing component 9 is less than that of the liquid refrigerant. When the sealing component 9 is pressed against the fifth interface 12 or the inner wall of the clamping pipe 11, no liquid refrigerant flow or gaseous refrigerant flow occurs between the gas chamber 408 and the liquid chamber 409. The filling pipe is always filled with liquid refrigerant and there are no gas phase cavitation bubbles, thus avoiding flow and pressure jumps caused by gas-liquid alternation.

[0042] Furthermore, during the refrigerant charging process, the pressure inside the liquid chamber 409 is greater than the pressure inside the gas chamber 408.

[0043] Furthermore, during the preparation process before refrigerant charging, the vacuum level inside the refrigeration unit is brought to -0.1 MPa and kept stable.

[0044] Furthermore, the end of the filling pipeline away from the third interface 405 is equipped with a male connector of a double-sided self-sealing double-shut-off quick-connector, which is common in the prior art. The charging valve of the refrigeration unit is equipped with a female connector of a double-sided self-sealing double-shut-off quick-connector. In the preparation steps before refrigerant filling, the operator evacuates both the refrigeration unit and the filling pipeline, eliminating the need to purge the filling pipeline with refrigerant and reducing refrigerant waste.

[0045] Furthermore, both container 403 and refrigerant storage tank are equipped with temperature control components commonly found in the prior art. These components reduce temperature fluctuations in the refrigerant within container 403 and refrigerant storage tank, eliminating refrigerant pressure drift caused by day-night temperature differences.

[0046] Furthermore, the sliding member 407 has an opening that connects the gas chamber 408 and the liquid chamber 409. The fifth interface 12 is an extension tube extending outward from the opening. The outer side of the extension tube and one end of the inner wall of the clamping tube 11 are threaded or sealed and clamped. The inner diameter of the clamping tube 11 gradually decreases in the direction away from the sliding member 407.

[0047] Furthermore, the sealing element 9 can move along the axial direction of the card connector 11 within the card connector 11. When the sealing element 9 is not against the fifth interface 12 or the inner wall of the card connector 11, there is a gap between the sealing element 9 and the inner wall of the card connector 11.

[0048] The reciprocating thrust assembly 1 used in this invention is a commonly used servo electric cylinder, hydraulic cylinder or linear motor in the prior art. Its working method and structure are well known technologies and will not be described in detail here.

[0049] Example 2: like Figure 2 and Figure 3 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, a heating component 7 is attached to the outer side of the container 403 at the position corresponding to the liquid chamber 409. The ratio of the contact area between the heating component 7 and the container 403 to the outer area of ​​the container 403 is 1:10-100. The container 403 is made of metal. The heating component 7 is an electric heating element or a heating tape. The maximum temperature of the heating component 7 during operation does not exceed 50°C. The installation position of the heating component 7 on the container 403 is far away from the third interface 405.

[0050] Furthermore, the heating component 7 is electrically connected to an external controller.

[0051] The working process and principle of this embodiment are as follows: In the later stage of refrigerant charging, the sliding part 407 is stopped moving, and the operator closes the gaseous refrigerant control valve and the liquid refrigerant control valve. The operator or controller uses the heating component 7 to heat a small portion of the refrigerant in the liquid chamber 409. A portion of the refrigerant in the liquid chamber 409 vaporizes, and the gaseous refrigerant produced by vaporization causes the pressure in the liquid chamber 409 and the gas chamber 408 to increase slowly. The liquid refrigerant in the liquid chamber 409 flows slowly to the refrigeration unit, achieving precise control of the refrigerant charging amount and improving the charging accuracy of the refrigerant charging machine of this refrigeration unit.

[0052] Furthermore, an external Coriolis mass flow meter is installed on the injection pipeline.

[0053] Example 3: like Figure 2 , Figure 3 , Figure 4As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 2. The difference is that in this embodiment, the heating component 7 is installed on one end face of the container 403. A drive mechanism 5 is installed on the container 403 near the heating component 7 via a fixing frame. A first magnetic component 6 is installed on the output shaft of the drive mechanism 5. A rotating second magnetic component 10 is installed in the liquid cavity 409 away from the sliding component 407 and is magnetically attracted to the first magnetic component 6. A swinging component 8 that slides against the inner wall of the liquid cavity 409 is installed on the second magnetic component 10. The drive mechanism 5 is a motor, hydraulic motor, or pneumatic motor. The drive mechanism 5 can drive the first magnetic component 6 to rotate against the end face of the container 403.

[0054] The working process and principle of this embodiment are as follows: The operator drives the drive mechanism 5 to rotate the first magnetic component 6. The magnetic attraction between the first magnetic component 6 and the second magnetic component 10 causes the second magnetic component 10 to drive the swing component 8 to rotate. The rotating swing component 8 sweeps away the air bubbles generated on the inner wall of the liquid chamber 409 when the heating component 7 is working, thus preventing the air bubbles on the inner wall of the liquid chamber 409 from entering the third interface 405 with the liquid refrigerant during the refrigerant filling process, thereby improving the refrigerant filling accuracy.

[0055] Furthermore, the second magnetic component 10 is mounted on the inner wall of the liquid chamber 409 via a bearing or a rotating pin.

[0056] Furthermore, both the first magnetic component 6 and the second magnetic component 10 are permanent magnets, or both the first magnetic component 6 and the second magnetic component 10 are mounting frames on which permanent magnets are installed.

[0057] During the heating process of the heating component 7, heat is transferred to all parts of the container 403, which can easily cause bubbles to be generated on the inner wall of the liquid chamber 409 away from the heating component 7. The bubbles near the third interface 405 are easily carried into the filling pipe by the flow of the liquid cold agent.

[0058] Example 4: like Figure 6 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 1. The difference is that the sealing component 9 in this embodiment includes a first half-shell 901 and a second half-shell 903 that can be mated with each other. The first half-shell 901 and the second half-shell 903 are provided with matching annular contact surfaces.

[0059] The first half-shell 901 and the second half-shell 903 are joined together and then assembled into a closed hollow shell by threaded connection, magnetic fixation or snap-fit. A counterweight 902 is installed on the inner wall of the second half-shell 903.

[0060] The working process and principle of this embodiment are as follows: Different weights of counterweights 902 can be installed on the inner wall of the second half-shell 903 to meet the charging operation of different types of refrigerants.

[0061] The 902 is a counterweight that is heavy when the refrigerant has a high density and is replaced with a heavy counterweight, while the 902 is a counterweight that is light when the refrigerant has a low density and is replaced with a light counterweight.

[0062] Example 5: like Figure 1 , Figure 2 , Figure 4 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 1. The difference is that a pressure sensor 2 is installed between the moving part of the reciprocating thrust assembly 1 and one end of the piston rod 401 in this embodiment. The pressure sensor 2 is electrically connected to an external controller, which is a PLC controller or an industrial control computer.

[0063] The working process and principle of this embodiment are as follows: Pressure sensor 2 is connected in series in the force transmission path of the moving part of reciprocating thrust assembly 1, piston rod 401, and sliding part 407. It converts the pressure during the filling process of the refrigeration machine into an electrical signal and transmits the electrical signal to the controller, so that the operator can know the pressure value and avoid damage to the filling pipeline or the refrigeration machine due to excessive refrigerant pressure in the liquid chamber 409.

[0064] Example 6: like Figure 4 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 1, except that the container 403 in this embodiment includes a circular cylindrical body 4032 with openings at both ends. A first end cap 4031 and a second end cap 4033 are detachably installed on the two openings of the cylindrical body 4032, respectively. The first end cap 4031 and the second end cap 4033 seal the inner cavity of the cylindrical body 4032. A piston rod through hole is provided on the first end cap 4031. The other end of the piston rod 401 passes through the piston rod through hole and extends to the outside of the container 403. A sealing gasket is installed on the inner wall of the piston rod through hole. A first interface 402 communicating with a gas chamber 408 is provided on the first end cap 4031. A second interface 404 and a third interface 405 communicating with a liquid chamber 409 are provided on the second end cap 4033.

[0065] The working process and principle of this embodiment are as follows: The first end cap 4031 and the second end cap 4033 are detachably installed on the two openings of the cylinder 4032, making the container 403 easy to maintain and repair.

[0066] Example 7: like Figure 1 , Figure 2 , Figure 4 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Its structure is roughly the same as that of Embodiment 1. The difference is that the container 403 in this embodiment has a fourth interface 406 that communicates with the gas chamber 408.

[0067] The working process and principle of this embodiment are as follows: During refrigeration machine maintenance, when the refrigeration machine needs a small amount of refrigerant replenishment, the operator should run the refrigeration machine in cooling mode for at least 5 minutes. The fourth interface 406 and the low-pressure side interface of the refrigeration machine are connected through an external gaseous refrigerant pipe threaded connection. Loosen the threaded connection between the low-pressure side interface of the refrigeration machine and the gaseous refrigerant pipe for 1-3 seconds to purge the air in the gaseous refrigerant pipe, and then tighten the threaded connection between the low-pressure side interface of the refrigeration machine and the gaseous refrigerant pipe.

[0068] The operator opens the liquid refrigerant control valve and closes the gaseous refrigerant control valve. The reciprocating thrust assembly 1 drives the sliding member 407 to move upward a set distance within the container 403 via the piston rod 401. The moving sliding member 407 causes the gaseous refrigerant in the gas chamber 408 to be injected into the refrigeration unit's pipeline through the fourth interface 406, the gaseous refrigerant pipeline, and the low-pressure side interface of the refrigeration unit, thus completing the filling of the refrigeration unit's pipeline with gaseous refrigerant. Then, the gaseous refrigerant pipeline and the low-pressure side interface of the refrigeration unit are disconnected. This refrigeration unit's refrigerant filling machine accelerates the filling speed of the gaseous refrigerant.

[0069] During the process of the reciprocating thrust assembly 1 driving the sliding member 407 to move upward a set distance in the container 403 via the piston rod 401, the pressure of the liquid refrigerant in the liquid chamber 409 decreases, and part of the liquid refrigerant in the liquid chamber 409 evaporates into gaseous refrigerant.

[0070] Preferably, this embodiment is applicable to the charging of R22 refrigerant.

[0071] Preferably, the refrigerant filling machine of this refrigeration system is used in conjunction with an external gas pipe pressure gauge valve group to achieve flow direction control and flow rate control of gaseous and liquid refrigerants.

[0072] Example 8: like Figures 1-6 As shown, this embodiment discloses a refrigerant filling method for a refrigeration machine, applied to the refrigerant filling machine of any one of embodiments one through seven. The refrigerant filling machine is used in conjunction with a refrigerant storage tank. This embodiment includes the following steps: The refrigerant storage tank is equipped with a liquid refrigerant control valve and a gaseous refrigerant control valve, and the third port 405 of container 403 is equipped with a liquid outlet control valve.

[0073] Refrigerant is injected into container 403: both the liquid refrigerant control valve and the gaseous refrigerant control valve on the refrigerant storage tank are closed, the liquid chamber 409 is higher than the gas chamber 408, the first port 402 on container 403 and the gaseous refrigerant control valve on the refrigerant storage tank are connected by a pipeline, the second port 404 on container 403 and the liquid refrigerant control valve on the refrigerant storage tank are connected by a pipeline, and the liquid outlet control valve on the third port 405 is connected to the inlet of the vacuum pump by a pipeline. Then, the liquid outlet control valve is opened. The valve is used to evacuate the gas chamber 408, liquid chamber 409, and all pipelines using an external vacuum pump and maintain the pressure for at least 10 minutes. Then, the liquid outlet control valve is closed, and the pipeline connection between the vacuum pump and the liquid outlet control valve is disconnected. The container 403 is rotated so that the gas chamber 408 is higher than the liquid chamber 409, and the refrigerant storage tank is higher than the container 403. The liquid refrigerant control valve and the gaseous refrigerant control valve are opened, allowing the liquid refrigerant in the refrigerant storage tank to flow into the liquid chamber 409, and the gaseous refrigerant in the refrigerant storage tank to flow into the gas chamber 408.

[0074] Preparation before refrigerant charging: Both the liquid refrigerant control valve and the gaseous refrigerant control valve are in the open position. The reciprocating thrust assembly 1 drives the sliding part 407 to move upward in the container 403 through the piston rod 401. Then, the electronic expansion valve of the refrigeration unit is opened to ensure that the high and low pressure pipelines of the refrigeration unit are connected. The refrigeration unit is evacuated using a vacuum pump to achieve a vacuum level of -0.1MPa and maintain it stably. Then, the liquid outlet control valve on the third interface 405 and the charging valve of the refrigeration unit are connected using a charging pipeline. The connection between the charging pipeline and the charging valve of the refrigeration unit is loosened. The liquid outlet control valve is opened slightly for 1-3 seconds to purge the air in the pipeline between the liquid outlet control valve and the charging valve of the refrigeration unit with liquid refrigerant. Then, the connection between the charging pipeline and the charging valve of the refrigeration unit is restored to a firm position.

[0075] Refrigerant charging: Close the liquid outlet control valve, close the liquid refrigerant control valve, and open the gaseous refrigerant control valve. The reciprocating thrust assembly 1 drives the sliding member 407 to move downward in the container 403 via the piston rod 401, thereby discharging the gaseous refrigerant in the liquid chamber 409. Then, open the liquid outlet control valve. The reciprocating thrust assembly 1 drives the sliding member 407 to move downward a set distance in the container 403 via the piston rod 401, completing the charging of a preset volume of liquid refrigerant into the pipeline of the refrigeration machine. Then, disconnect the charging pipeline from the charging valve of the refrigeration machine.

[0076] The process involves two steps: refrigerant preparation and refrigerant charging. Refrigerant is charged sequentially to multiple refrigeration units.

[0077] The working process and principle of this embodiment are as follows: This refrigerant filling method for refrigeration machines is simple to operate, reduces refrigerant leakage, and improves the filling accuracy of the refrigerant filling machine.

[0078] The average density of the sealing component 9 is less than that of the liquid refrigerant. When the sealing component 9 is pressed against the fifth interface 12 or the inner wall of the clamping pipe 11, no liquid refrigerant flow or gaseous refrigerant flow occurs between the gas chamber 408 and the liquid chamber 409. The filling pipe is always filled with liquid refrigerant and there are no gas phase cavitation bubbles, thus avoiding flow and pressure jumps caused by gas-liquid alternation.

[0079] Example 9: like Figures 1-6 As shown, this embodiment discloses a refrigerant filling machine for a refrigeration system. Based on embodiment eight, this embodiment further includes the following steps: A heating element 7 is fitted onto the container 403 at the position corresponding to the liquid chamber 409.

[0080] In the later stage of refrigerant charging, close the gaseous refrigerant control valve and the liquid refrigerant control valve to enable the heating component 7 to operate.

[0081] The working process and principle of this embodiment are as follows: In the later stage of refrigerant charging, a portion of the refrigerant in the liquid chamber 409 is heated and vaporized by the heat generated by the heating component 7. The gaseous refrigerant produced by vaporization causes the pressure in the liquid chamber 409 and the gas chamber 408 to increase slowly. The liquid refrigerant in the liquid chamber 409 flows slowly to the refrigeration unit, thereby achieving precise control of the refrigerant charging amount and improving the charging accuracy of the refrigerant charging machine of this refrigeration unit.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A refrigerant filling machine for a refrigeration system, characterized in that: The container includes a reciprocating thrust assembly (1) and an injection assembly (4). The injection assembly (4) includes a hollow container (403) and a sliding member (407) that slides in the inner cavity of the container (403). The sliding member (407) divides the inner cavity of the container (403) into a gas chamber (408) and a liquid chamber (409). One side of the sliding member (407) is connected to one end of a piston rod (401). The other end of the piston rod (401) extends slidably to the outside of the container (403). The container (403) has a first interface (402) that communicates with the gas chamber (408) and a second interface (404) and a third interface (405) that communicate with the liquid chamber (409). The sliding member (407) has a fifth interface (12) that connects the gas chamber (408) and the liquid chamber (409). The fifth interface (12) is connected to one end of the retaining tube (11). The inner diameter of the retaining tube (11) gradually decreases in the direction away from the sliding member (407). The retaining tube (11) is provided with a sealing member (9). The reciprocating thrust assembly (1) includes a fixed component and a moving component. The moving component of the reciprocating thrust assembly (1) is connected to the piston rod (401) at one end outside the container (403). The moving component of the reciprocating thrust assembly (1) is used to drive the sliding member (407) to reciprocate in a preset direction in the inner cavity of the container (403). Among them, the average density of the sealing element (9) is less than the density of the liquid refrigerant. When the sealing element (9) is pressed against the fifth interface (12) or the inner wall of the clamping pipe (11), no flow of liquid refrigerant or gaseous refrigerant occurs between the gas chamber (408) and the liquid chamber (409).

2. The refrigerant filling machine for a refrigeration system according to claim 1, characterized in that: A heating component (7) is installed on the container (403) at the position corresponding to the liquid chamber (409).

3. The refrigerant filling machine for a refrigeration system according to claim 2, characterized in that: The heating component (7) is installed on one end face of the container (403). A driving mechanism (5) is installed on the container (403) near the heating component (7). A first magnetic component (6) is installed on the output shaft of the driving mechanism (5). A second magnetic component (10) that rotates magnetically attracted to the first magnetic component (6) is installed on the liquid cavity (409) away from the sliding component (407). A swing component (8) that slides against the inner wall of the liquid cavity (409) is installed on the second magnetic component (10).

4. The refrigerant filling machine for a refrigeration system according to claim 1, characterized in that: The sealing component (9) includes a first half-shell (901) and a second half-shell (903) that can engage with each other, and the first half-shell (901) and the second half-shell (903) are provided with matching annular contact surfaces. The first half-shell (901) and the second half-shell (903) are joined together to form a closed hollow shell. A counterweight (902) is installed on the inner wall of the second half-shell (903).

5. The refrigerant filling machine for a refrigeration system according to claim 1, characterized in that: The reciprocating thrust assembly (1) is a servo electric cylinder, hydraulic cylinder or linear motor, and the fixed part and container (403) of the reciprocating thrust assembly (1) are connected by a support frame (3).

6. The refrigerant filling machine for a refrigeration system according to claim 5, characterized in that: A pressure sensor (2) is installed between the moving part of the reciprocating thrust assembly (1) and one end of the piston rod (401).

7. The refrigerant filling machine for a refrigeration system according to claim 1, characterized in that: The container (403) includes a circular cylindrical body (4032) with openings at both ends, and a first end cap (4031) and a second end cap (4033) are respectively installed on the two openings of the cylindrical body (4032).

8. The refrigerant filling machine for a refrigeration system according to claim 1, characterized in that: The container (403) has a fourth interface (406) that communicates with the gas chamber (408).

9. A refrigerant filling method for a refrigeration machine, applied to the refrigerant filling machine of any one of claims 1-8, characterized in that, Includes the following steps: The refrigeration machine refrigerant filling machine is used in conjunction with a refrigerant storage tank, which is equipped with a liquid refrigerant control valve and a gaseous refrigerant control valve. Install a liquid discharge control valve on the third port (405) of the container (403); Refrigerant injection into container (403): Close both the liquid refrigerant control valve and the gaseous refrigerant control valve on the refrigerant storage tank, and make the liquid chamber (409) higher than the gas chamber (408). Connect the first port (402) on container (403) and the gaseous refrigerant control valve on the refrigerant storage tank through a pipeline. Connect the second port (404) on container (403) and the liquid refrigerant control valve on the refrigerant storage tank through a pipeline. Connect the liquid outlet control valve on the third port (405) and the air inlet of the vacuum pump through a pipeline. Then open the liquid outlet control valve, evacuate the gas chamber (408), liquid chamber (409) and each pipeline and maintain the pressure for more than 10 minutes. Then close the liquid outlet control valve, make the gas chamber (408) higher than the liquid chamber (409), make the refrigerant storage tank higher than the container (403), and open the liquid refrigerant control valve and the gaseous refrigerant control valve. Preparation before refrigerant charging: both the liquid refrigerant control valve and the gaseous refrigerant control valve are in the open state. The reciprocating thrust assembly (1) drives the sliding part (407) to move upward in the container (403) through the piston rod (401), so that the electronic expansion valve of the refrigerator is opened and the refrigerator is evacuated. Then, the liquid outlet control valve on the third interface (405) and the charging valve of the refrigerator are connected by the charging pipe. The air in the pipeline between the liquid outlet control valve and the charging valve of the refrigerator is emptied with liquid refrigerant. Refrigerant charging: Close the liquid outlet control valve, close the liquid refrigerant control valve and open the gaseous refrigerant control valve. The reciprocating thrust assembly (1) drives the sliding part (407) to move downward in the container (403) through the piston rod (401). Then open the liquid outlet control valve. The reciprocating thrust assembly (1) drives the sliding part (407) to move downward a set distance in the container (403) through the piston rod (401). Then disconnect the charging pipe from the charging valve of the refrigeration machine.

10. The refrigerant charging method for a refrigeration machine according to claim 9, characterized in that, It also includes the following steps: A heating component (7) is attached to the container (403) at the position corresponding to the liquid chamber (409); In the later stage of refrigerant charging, close the gaseous refrigerant control valve and the liquid refrigerant control valve to make the heating component (7) work.

Images