A refrigeration system with refrigerant redundancy adjustment function and its control method

Abstract

This invention provides a refrigeration system and its control method with refrigerant redundancy adjustment function. The refrigeration system includes a compressor, a liquid receiver, a condenser, a first pipeline, a second pipeline, and a rotary tube. The rotary tube is disposed inside the liquid receiver and has a first drain hole. Liquid refrigerant in the liquid receiver can enter the rotary tube through the first drain hole and be further discharged into the second pipeline. The height of the first drain hole in the rotary tube changes with the frequency of the compressor; the higher the compressor frequency, the lower the height of the first drain hole, and vice versa. According to this invention, sufficient refrigerant can participate in the refrigeration cycle of the system under high-frequency operation, while less refrigerant enters the system to participate in the cycle under low-frequency operation, thus solving the problem of refrigerant redundancy caused by differences in the required refrigerant charge under different operating conditions.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and more specifically to a refrigeration system and its control method that have a refrigerant redundancy adjustment function. Background Technology

[0002] With the widespread application of 4G and the gradual popularization of 5G, the heat generated by various data processing devices is increasing, and data centers are placing higher and higher demands on the cooling capacity and energy efficiency of their air conditioning equipment.

[0003] Using outdoor natural cold sources during transitional seasons and cold winters to cool data centers can significantly reduce the operating costs of air conditioning equipment. A common approach is to use refrigerant pump air conditioning, which activates the refrigerant pump mode in winter, stops the compressor from running, and uses the refrigerant pump to drive the refrigerant to achieve heat pipe cooling, greatly reducing the operating costs of the equipment.

[0004] The refrigerant pump compression refrigeration system is a composite system. The refrigerant pump heat pipe system shares the evaporator and condenser with the compression refrigeration system, as well as some shared refrigerant pipes and system components.

[0005] Because the heat load of data centers fluctuates with user activity and seasonal variations, more and more data center air conditioners are now using inverter technology to cope with these fluctuations and ensure the data center's constant temperature and humidity requirements. However, changes in the compressor frequency of the refrigeration system can alter the optimal refrigerant circulation volume; generally, higher frequencies require a larger refrigerant circulation volume. If the optimal refrigerant charge is designed and developed for 100% load, the optimal refrigerant charge for 75%, 50%, or other low-frequency operating conditions will be relatively low. Therefore, refrigerant may accumulate inside the unit under low-frequency conditions, and this accumulation at the bottom of the heat exchanger hinders heat exchange.

[0006] Because existing compression refrigeration systems suffer from refrigerant redundancy due to differences in refrigerant charge amounts under different operating conditions, this invention researches and designs a refrigeration system and its control method with refrigerant redundancy adjustment function. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect of refrigerant redundancy caused by the difference in the amount of refrigerant required under different operating conditions in the existing compression refrigeration system, thereby providing a refrigeration system and its control method with refrigerant redundancy adjustment function.

[0008] To address the above problems, the present invention provides a refrigeration system with refrigerant redundancy adjustment function, comprising:

[0009] The system comprises a compressor, a liquid receiver, a condenser, a first pipeline, a second pipeline, and a rotary tube. One end of the first pipeline is connected to the condenser, and the other end is connected to the interior of the liquid receiver, allowing refrigerant that has undergone heat exchange in the condenser to be introduced into the liquid receiver. The rotary tube is located inside the liquid receiver and has a first drain hole. Liquid refrigerant in the liquid receiver can enter the rotary tube through the first drain hole and be further discharged into the second pipeline. The height of the first drain hole in the rotary tube during drainage varies with the frequency of the compressor. The higher the frequency of the compressor, the lower the height of the first drain hole in the rotary tube during drainage, and vice versa.

[0010] In some implementations...

[0011] There are multiple first drain holes, which are arranged at intervals along the height direction of the rotating tube. The rotating tube drains liquid through at least one of the first drain holes at different heights. The higher the frequency of the compressor, the lower the height of the first drain hole for draining liquid through the rotating tube, and vice versa.

[0012] In some implementations...

[0013] It also includes a fixed tube, which is sleeved with the rotating tube. The rotating tube is sleeved on the outer periphery of the fixed tube or the fixed tube is sleeved on the outer periphery of the rotating tube. The fixed tube is provided with a plurality of second drainage holes along the height direction.

[0014] Multiple first drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. The rotating tube has a cylindrical structure, and its outer circumferential surface has a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drainage holes are arranged at intervals, and in the projection of the short side, multiple first drainage holes are also arranged at intervals. Multiple second drainage holes are arranged at intervals only along the vertical direction on the fixed tube. The first drainage holes and the second drainage holes correspond one-to-one in the height direction.

[0015] Alternatively, multiple second drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. The fixed tube is a cylindrical structure, and the unfolded surface of its outer circumference is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple second drainage holes are arranged at intervals, and in the projection of the short side, multiple second drainage holes are also arranged at intervals. Multiple first drainage holes are arranged at intervals only along the vertical direction on the rotating tube, and the first drainage holes and second drainage holes correspond one-to-one in the height direction.

[0016] Alternatively, multiple first drainage holes are arranged at intervals along a first height direction and also at intervals along a first circumferential direction. The rotating tube has a cylindrical structure, and its outer circumferential surface is rectangular, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drainage holes are arranged at intervals, and in the projection of the short side, multiple first drainage holes are also arranged at intervals. Multiple second drainage holes are arranged at intervals along a second height direction and also at intervals along the first circumferential direction. The fixed tube has a cylindrical structure, and its outer circumferential surface is rectangular, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple second drainage holes are arranged at intervals, and in the projection of the short side, multiple second drainage holes are also arranged at intervals. The second height direction is opposite to the first height direction. The first drainage holes and second drainage holes correspond one-to-one in the height direction.

[0017] By rotating the rotating tube, the first drain hole and the second drain hole at the same height are made to face each other and communicate, so that the fluid in the storage tank is discharged into the second pipeline only through the first drain hole and the second drain hole at the same height.

[0018] In some implementations...

[0019] The first drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube, there are no more than two overlapping first drainage holes. In the short side projection of the outer circumferential surface of the rotating tube, there are also no more than two overlapping first drainage holes. The second drainage holes are arranged at intervals only along the vertical direction. The first drainage holes and the second drainage holes correspond one-to-one in the height direction.

[0020] Alternatively, multiple second drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube, no two second drainage holes overlap. In the short side projection of the outer circumferential surface of the fixed tube, no two second drainage holes overlap. Multiple first drainage holes are arranged at intervals only along the vertical direction. The first drainage holes and the second drainage holes correspond one-to-one in the height direction.

[0021] Alternatively, multiple first drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube, no two first drainage holes overlap. In the short side projection of the outer circumferential surface of the rotating tube, no two first drainage holes overlap either. Similarly, multiple second drainage holes are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube, no two second drainage holes overlap. In the short side projection of the outer circumferential surface of the fixed tube, no two second drainage holes overlap either. The first drainage holes and the second drainage holes correspond one-to-one in the height direction.

[0022] Fluid enters the fixed pipe only through the first drain hole and the second drain hole at the same height and opposite to each other. The first drain hole and the second drain hole at the same height form a drain group. By rotating the rotating pipe, the fluid in the storage tank is discharged into the second pipeline through the drain groups at different heights.

[0023] In some implementations...

[0024] The top of the rotating tube is closed and the bottom is open. The top of the fixed tube is also closed and the bottom is open. When the rotating tube is sleeved on the outer periphery of the fixed tube, the lower part of the fixed tube extends out of the liquid storage tank to communicate with the second pipeline. The part at the bottom of the liquid storage tank that allows the fixed tube to pass through is the first outlet. The part of the fixed tube opposite to the bottom of the liquid storage tank is fixedly connected to the bottom of the liquid storage tank.

[0025] Alternatively, when the fixed tube is sleeved around the outer periphery of the rotating tube, the lower end of the rotating tube extends outside the storage tank to communicate with the second pipeline. The part of the bottom of the storage tank that allows the rotating tube to pass through is the first outlet. The part of the rotating tube opposite to the bottom of the storage tank is fixedly connected to the bottom of the storage tank.

[0026] In some implementations...

[0027] When the rotating tube is sleeved on the outer periphery of the fixed tube, there is a gap between the inner peripheral wall of the rotating tube and the outer peripheral wall of the fixed tube, and the size of the gap is 0.01 to 0.2 mm; a sealing material is provided on the outer peripheral surface of the fixed tube and / or the inner peripheral surface of the rotating tube, and the sealing material avoids the first drain hole and the second drain hole;

[0028] Alternatively, when the fixed tube is sleeved on the outer periphery of the rotating tube, there is a gap between the outer peripheral wall of the rotating tube and the inner peripheral wall of the fixed tube, the size of which is 0.01 to 0.2 mm. A sealing material is provided on the inner peripheral surface of the fixed tube and / or the outer peripheral surface of the rotating tube, the sealing material avoiding the first drain hole and the second drain hole.

[0029] In some implementations...

[0030] When the rotating tube is sleeved on the outer periphery of the fixed tube, a sensing protrusion is also connected to the top end of the rotating tube.

[0031] The inner top of the liquid storage tank protrudes upward to form a receiving groove. At least a portion of the structure of the sensing protrusion is inserted into the receiving groove. The receiving groove protrudes upward on the outside of the liquid storage tank to form a mounting protrusion. An electromagnetic coil is provided on the mounting protrusion. The sensing protrusion is made of magnetic material or has magnetic material on it. When the electromagnetic coil is energized, it can generate a magnetic field to drive the sensing protrusion to rotate, thereby driving the rotating tube to rotate as a whole.

[0032] In some implementations...

[0033] The electromagnetic coil has a ring structure and is sleeved on the outer periphery of the mounting protrusion; when the electromagnetic coil is energized in the forward direction, the rotating tube rotates clockwise, and when the electromagnetic coil is energized in the reverse direction, the rotating tube rotates counterclockwise; or when the electromagnetic coil is energized in the forward direction, the rotating tube rotates counterclockwise, and when the electromagnetic coil is energized in the reverse direction, the rotating tube rotates clockwise.

[0034] In some implementations...

[0035] The top of the mounting protrusion is a solid structure, making the receiving groove a blind groove structure with the upper end closed. The rotating tube, the fixed tube, and the receiving groove are all arranged coaxially, with their axial direction arranged in the vertical direction.

[0036] In some implementations...

[0037] It also includes a bearing assembly disposed at the inner bottom of the liquid storage tank. When the rotating tube is sleeved on the outer periphery of the fixed tube, the bearing assembly is connected to the outer periphery of the rotating tube. When the fixed tube is sleeved on the outer periphery of the rotating tube, the bearing assembly is connected to the inner periphery of the rotating tube, so as to support the rotating tube to rotate inside the liquid storage tank.

[0038] In some implementations...

[0039] When the rotating tube is sleeved on the outer periphery of the fixed tube, a stop rod is provided on the outer periphery of the rotating tube protruding radially outward;

[0040] The bearing assembly has a positioning post protruding upwards, which can lock the stop rod to limit the rotation of the rotating tube.

[0041] In some implementations...

[0042] From top to bottom, when the rotating tube rotates clockwise until the stop rod connects with the positioning post, the first drain hole at the bottom of the rotating tube and the second drain hole at the bottom of the fixed tube are opposite to and connected. The other first drain holes and other second drain holes are not connected. As the rotating tube rotates counterclockwise, from bottom to top in the vertical direction, the first drain holes and second drain holes at different heights are connected to each other in sequence. When the tube rotates counterclockwise until the stop rod connects with the positioning post again, the first drain hole at the top and the second drain hole at the top are opposite to and connected.

[0043] Alternatively, from top to bottom, when the rotating tube rotates clockwise until the stop rod connects with the positioning post, the first drain hole at the top of the rotating tube is opposite to and connected with the second drain hole at the top of the fixed tube. The other first drain holes and other second drain holes are not connected. As the rotating tube rotates counterclockwise, from top to bottom in the vertical direction, the first drain holes and second drain holes at different heights are sequentially connected. When the tube rotates counterclockwise until the stop rod connects with the positioning post again, the first drain hole at the bottom is opposite to and connected with the second drain hole at the bottom.

[0044] In some implementations...

[0045] In the plane in which the rotating tube unfolds circumferentially, the circumferential distance between two adjacent first drainage holes is L, and the length of each first drainage hole in the circumferential direction is also L. The circumference of the rotating tube is D, and D = 2nL, where n is the number of first drainage holes.

[0046] In some implementations...

[0047] Within the plane in which the rotating tube unfolds circumferentially, the shape of the first drain hole is rectangular, rhomboid, circular, or elliptical, and the shape of the second drain hole is the same as that of the first drain hole, being rectangular, rhomboid, circular, or elliptical.

[0048] In some implementations...

[0049] It also includes an evaporator and a throttling valve. One end of the second pipeline is connected to the interior of the fixed pipe and the other end is connected to the evaporator. The throttling valve is installed on the second pipeline so that the refrigerant in the liquid storage tank can be discharged to the throttling valve.

[0050] The first pipeline is connected to the liquid storage tank at the top of the liquid storage tank, and the other end of the first pipeline extends downward from the top of the liquid storage tank into the liquid storage tank.

[0051] In some implementations...

[0052] The refrigeration system is a refrigerant pump compression refrigeration system, which also includes a refrigerant pump, a one-way valve A, and a third pipeline. The one-way valve A is located on the second pipeline and can only allow fluid to flow from the liquid storage tank to the second pipeline. The bottom of the liquid storage tank is also provided with a second liquid outlet. One end of the third pipeline is connected to the inner bottom of the liquid storage tank through the second liquid outlet, and the other end is connected to the position on the second pipeline located between the one-way valve A and the throttle valve. The refrigerant pump is located on the third pipeline.

[0053] The present invention also provides a control method for a refrigeration system with refrigerant redundancy adjustment function as described above, comprising:

[0054] The testing steps include checking whether the operating mode is compression refrigeration mode or refrigerant pump refrigeration mode. When it is in compression refrigeration mode, the operating frequency of the compressor is also checked.

[0055] The judgment step is to determine whether the current frequency detection value of the compressor is increased or decreased relative to its previous frequency detection value;

[0056] The control steps are as follows: when the current frequency detection value increases relative to the previous frequency detection value, the rotating tube is controlled to lower the height of the first drain hole during drainage; when the current frequency detection value decreases relative to the previous frequency detection value, the rotating tube is controlled to raise the height of the first drain hole during drainage.

[0057] In some implementations...

[0058] When there are multiple first drainage holes and each hole also has an electromagnetic coil:

[0059] The control method further includes a calculation step, which calculates the time required for the rotating tube to rotate one revolution as t0, and calculates the target discharge height of the first discharge hole according to the operating frequency of the compressor.

[0060] The control steps involve first energizing the electromagnetic coil in either the forward or reverse direction for a time t≥t0, causing the first drain hole at the lowest or highest position to open and drain liquid. Then, the electromagnetic coil is energized in either the forward or reverse direction to rotate the rotating tube by a preset angle, allowing liquid to drain through the first drain hole with the target drain height.

[0061] The refrigeration system and its control method with refrigerant redundancy adjustment function provided by the present invention have the following beneficial effects:

[0062] 1. This invention, by incorporating a rotating tube inside the liquid storage tank and varying the discharge height of the first drain hole of the rotating tube according to the compressor frequency, enables the discharge height of the liquid storage tank to change with the compressor frequency. The higher the compressor frequency, the lower the discharge height of the first drain hole of the rotating tube, and thus the lower the discharge height of the liquid storage tank; conversely, the lower the compressor frequency, the higher the discharge height of the first drain hole of the rotating tube, and thus the higher the discharge height of the liquid storage tank. This allows for the discharge of more refrigerant liquid from the storage tank at high compressor frequencies, participating in the system circulation and ensuring sufficient refrigerant for the refrigeration cycle under high-frequency operation, guaranteeing normal cooling or heating effects. Conversely, at low compressor frequencies, a relatively small amount of refrigerant liquid is discharged from the storage tank, ensuring less refrigerant enters the system for circulation under low-frequency operation, preventing excessive refrigerant from stagnating in the heat exchanger and affecting heat exchange efficiency. This invention also solves the refrigerant redundancy problem caused by differences in refrigerant charge required under different operating conditions of a refrigerant pump compression refrigeration system, and addresses the issues of refrigerant liquid retention and release.

[0063] 2. This invention also utilizes a fixed tube to form a sleeve relationship with the rotating tube. Multiple second drain holes are also formed on the fixed tube along its height. One of the first drain holes on the rotating tube and the second drain holes on the fixed tube are arranged alternately in the vertical direction, while the other is also alternately arranged alternately in the circumferential direction (horizontal direction) while being spaced out in the vertical direction. This forms a drain hole structure that gradually shifts from top to bottom towards one side of the circumference. Thus, by rotating the rotating tube, the first and second drain holes at different heights can be connected, allowing the drain height of the storage tank to be controlled according to the compressor frequency. The purpose and effect are as follows: When the compressor frequency is high, the first drain hole with the lower height is selected for draining to ensure that there is enough refrigerant to participate in the refrigeration cycle of the system under high-frequency operation, thus ensuring normal cooling or heating effect. When the compressor frequency is low, the first drain hole with the higher height and the second drain hole are connected for draining, so that less refrigerant enters the system to participate in the cycle under low-frequency operation, avoiding the situation where too much refrigerant enters the system and causes refrigerant to remain in the heat exchanger. This effectively solves the problem of refrigerant redundancy caused by the difference in the amount of refrigerant required under different operating conditions of the fluorine pump compression refrigeration system.

[0064] 3. This invention designs an adjustable-height refrigerant outlet within the storage tank, allowing the refrigerant outlet to rise and fall with different operating frequencies under compression refrigeration mode. This, in turn, changes the amount of refrigerant liquid retained in the storage tank, ensuring optimal refrigerant circulation under various operating conditions. It effectively adjusts the optimal refrigerant circulation under different conditions with minimal additional control hardware and software, resulting in high reliability. Because optimal refrigerant circulation is guaranteed under all conditions, there is no retained refrigerant liquid obstructing the heat exchanger's piping space, allowing the heat exchanger to fully utilize its heat exchange capacity. This leads to higher energy efficiency in the refrigeration system during low-frequency operation, effectively solving the refrigerant redundancy problem caused by differences in refrigerant charge amounts under different operating conditions in refrigerant pump compression refrigeration systems, and addressing the issues of refrigerant liquid retention and release. Attached Figure Description

[0065] Figure 1 This is a system structure diagram of the refrigeration system with refrigerant redundancy adjustment function of the present invention (liquid storage tank embodiment 1);

[0066] Figure 2 yes Figure 1 Enlarged structural view of the liquid storage tank section;

[0067] Figure 3 yes Figure 2 A plan view of the rotating tube in the diagram;

[0068] Figure 4 yes Figure 2 Enlarged view of the structure of the fixed tube in the diagram.

[0069] The reference numerals in the attached figures are as follows:

[0070] 1. Compressor; 2. Receiver; 3. Condenser; 4. Throttling valve; 5. Evaporator; 6. Rotary tube; 7. First drain hole; 8. Fixed tube; 9. Second drain hole; 10. Refrigerant pump; 11. Check valve A; 12. First outlet; 13. Bearing assembly; 14. Sensing protrusion; 15. Receiving tank; 16. Mounting protrusion; 17. Electromagnetic coil; 18. Stop rod; 19. Positioning column; 20. Internal fan; 21. Check valve B; 22. Oil separator; 23. Capillary tube; 24. External fan; 25. Second outlet; 26. Inlet;

[0071] 101. First pipeline; 102. Second pipeline; 103. Third pipeline. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0075] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0076] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0077] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0078] like Figure 1-4As shown, the present invention provides a refrigeration system with refrigerant redundancy adjustment function, comprising:

[0079] The system comprises a compressor 1, a liquid receiver 2, a condenser 3, a first pipeline 101, a second pipeline 102, and a rotating tube 6 (or rotating sleeve). One end of the first pipeline 101 is connected to the condenser 3, and the other end is connected to the interior of the liquid receiver 2, allowing refrigerant that has undergone heat exchange in the condenser 3 to be introduced into the liquid receiver 2. The rotating tube 6 is located inside the liquid receiver 2 and has a first drain hole 7 (or external hole). Liquid refrigerant in the liquid receiver 2 can enter the rotating tube 6 through the first drain hole 7 and be further discharged to the second pipeline 102. The height of the first drain hole 7 in the rotating tube 6 during drainage varies with the frequency of the compressor 1. The higher the frequency of the compressor 1, the lower the height of the first drain hole 7 in the rotating tube 6 during drainage, and vice versa.

[0080] This invention addresses the issue of refrigerant redundancy in a refrigerant pump refrigeration system by incorporating a rotating tube inside the reservoir. The height of the first drain hole in this tube varies with the compressor frequency. Higher compressor frequencies result in lower drain holes and consequently lower refrigerant heights in the reservoir, and vice versa. This allows for the discharge of more refrigerant liquid from the reservoir during high-frequency operation, ensuring sufficient refrigerant for optimal cooling and heating. Conversely, lower compressor frequencies result in less refrigerant being discharged during low-frequency operation, preventing refrigerant buildup in the heat exchanger and ensuring efficient heat exchange. This solution addresses the refrigerant redundancy problem caused by varying refrigerant charge amounts under different operating conditions in a refrigerant pump refrigeration system, and resolves the issues of refrigerant retention and release.

[0081] This invention designs an adjustable-height refrigerant outlet within the storage tank, allowing the refrigerant outlet to rise and fall with different operating frequencies under compression refrigeration mode. This, in turn, changes the amount of refrigerant liquid remaining in the storage tank, ensuring optimal refrigerant circulation under various operating conditions. It effectively adjusts the optimal refrigerant circulation under different conditions with minimal additional control hardware and software, resulting in high reliability. Because it guarantees optimal refrigerant circulation under all conditions, there is no residual refrigerant liquid encroaching on the heat exchanger's piping space, allowing the heat exchanger to fully utilize its heat exchange capacity. This leads to higher energy efficiency in the refrigeration system during low-frequency operation, effectively solving the refrigerant redundancy problem caused by differences in refrigerant charge amounts under different operating conditions in refrigerant pump compression refrigeration systems, and addressing the issues of refrigerant liquid retention and release.

[0082] In some implementations...

[0083] There are multiple first drain holes 7, which are arranged sequentially at intervals along the height direction of the rotating tube 6. The rotating tube 6 drains liquid through at least one of the first drain holes 7 at different heights. The higher the frequency of the compressor 1, the lower the height of the first drain hole 7 for draining liquid in the rotating tube 6, and vice versa.

[0084] This is a preferred structural form of the rotating tube and the first drain hole of the present invention. Multiple first drain holes are arranged from top to bottom along the height direction on the rotating tube (preferably spaced apart along both the vertical and horizontal directions (or circumferential directions)). This allows for drainage from the first drain holes at different heights via the driving (preferably rotation) of the rotating tube. The principle for selecting the first drain holes at different heights is based on the compressor frequency. When the compressor frequency is high, a lower-height first drain hole is selected for drainage to ensure sufficient refrigerant participates in the system's refrigeration cycle during high-frequency operation, guaranteeing normal cooling or heating effects. When the compressor frequency is low, a higher-height first drain hole is selected for drainage, allowing less refrigerant to enter the system and participate in the cycle during low-frequency operation. This avoids excessive refrigerant entering the system and causing refrigerant stagnation in the heat exchanger, effectively solving the problem of refrigerant redundancy caused by differences in refrigerant charge amounts required under different operating conditions of the fluorinated pump compression refrigeration system.

[0085] In some implementations...

[0086] It also includes a fixed tube 8 (or fixed inner tube), which is sleeved between the fixed tube 8 and the rotating tube 6. The rotating tube 6 is sleeved on the outer periphery of the fixed tube 8 or the fixed tube 8 is sleeved on the outer periphery of the rotating tube 6. The fixed tube 8 is provided with a plurality of second drainage holes 9 (or inner holes) along the height direction.

[0087] Multiple first drainage holes 7 are arranged at intervals along the height direction (i.e., all upward when going up, and all downward when going down) and also at intervals along the circumferential direction (forming a pattern as shown in the image). Figure 3 The arrangement shown is downward and gradually tilted to the right in the unfolded plane (preferably with only one first drain hole at the same height). The rotating tube 6 is a cylindrical structure, and its unfolded outer surface is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drain holes 7 are arranged alternately. In the projection of the short side, multiple first drain holes 7 are also arranged alternately. Multiple second drain holes 9 are arranged alternately only in the vertical direction on the fixed tube 8. The first drain holes 7 and the second drain holes 9 correspond one-to-one in the height direction.

[0088] Alternatively, multiple second drain holes 9 are arranged at intervals along the height direction and also at intervals along the circumferential direction. The fixed tube 8 has a cylindrical structure, and its outer circumferential surface is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple second drain holes 9 are arranged at intervals, and in the projection of the short side, multiple second drain holes 9 are also arranged at intervals. Multiple first drain holes 7 are arranged at intervals only along the vertical direction on the rotating tube 6. The first drain holes 7 and the second drain holes 9 correspond one-to-one in the height direction.

[0089] Alternatively, multiple first drainage holes 7 are arranged at intervals along a first height direction and also at intervals along a first circumferential direction. The rotating tube 6 has a cylindrical structure, and its outer circumferential surface is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drainage holes 7 are arranged at intervals, and in the projection of the short side, multiple first drainage holes 7 are also arranged at intervals. Multiple second drainage holes 9 are arranged at intervals along a second height direction. Simultaneously, the fixed tube 8 is arranged sequentially at intervals along the first circumferential direction. The fixed tube 8 has a cylindrical structure, and the unfolded surface of its outer circumferential surface has a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of its long side, a plurality of second drainage holes 9 are arranged sequentially at intervals. In the projection of its short side, a plurality of second drainage holes 9 are also arranged sequentially at intervals. The second height direction is opposite to the first height direction. The first drainage hole 7 and the second drainage hole 9 correspond one-to-one in the height direction.

[0090] By rotating the rotating tube 6, the first drain hole 7 and the second drain hole 9 at the same height are opposite to and connected, so that the fluid in the storage tank 2 is discharged into the second pipeline 102 only through the first drain hole 7 and the second drain hole 9 at the same height.

[0091] This invention also utilizes a fixed tube to form a sleeve relationship with the rotating tube. Multiple second drainage holes are also formed along the height direction on the fixed tube. One of the first drainage holes on the rotating tube and the second drainage holes on the fixed tube are arranged alternately in the vertical direction, while the other is arranged alternately in both the same height direction and the same circumferential direction (horizontal direction). Alternatively, they can be arranged in different height directions while simultaneously arranged in the same circumferential direction (an "X" shaped cross arrangement), thus forming a drainage hole structure that gradually shifts from top to bottom towards one side of the circumference. This allows the first and second drainage holes at different heights to connect through the rotation of the rotating tube, achieving the desired effect based on pressure. The purpose and effect of controlling the liquid level of the receiver tank by varying the compressor frequency: When the compressor frequency is high, the first drain hole with the lower height is selected for draining to ensure that there is enough refrigerant participating in the refrigeration cycle of the system under high-frequency operation, ensuring normal cooling or heating effect. When the compressor frequency is low, the first drain hole with the higher height is connected to the second drain hole for draining, so that less refrigerant enters the system to participate in the cycle under low-frequency operation, avoiding the situation where excessive refrigerant enters the system and causes refrigerant to remain in the heat exchanger. This effectively solves the problem of refrigerant redundancy caused by the difference in the amount of refrigerant required under different operating conditions of the fluorinated pump compression refrigeration system.

[0092] In some implementations...

[0093] The plurality of first drainage holes 7 are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube 6, there are no more than two overlapping first drainage holes 7. In the short side projection of the outer circumferential surface of the rotating tube 6, there are also no more than two overlapping first drainage holes 7. The plurality of second drainage holes 9 are arranged at intervals only along the vertical direction. The first drainage holes 7 and the second drainage holes 9 correspond one-to-one in the height direction.

[0094] Alternatively, multiple second drain holes 9 are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube 8, there are no more than two overlapping second drain holes 9. In the short side projection of the outer circumferential surface of the fixed tube 8, there are also no more than two overlapping second drain holes 9. Multiple first drain holes 7 are arranged at intervals only along the vertical direction. The first drain holes 7 and the second drain holes 9 correspond one-to-one in the height direction.

[0095] Alternatively, multiple first drain holes 7 are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube 6, no two first drain holes 7 overlap. In the short side projection of the outer circumferential surface of the rotating tube 6, no two first drain holes 7 overlap. Multiple second drain holes 9 are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube 8, no two second drain holes 9 overlap. In the short side projection of the outer circumferential surface of the fixed tube 8, no two second drain holes 9 overlap. The first drain holes 7 and the second drain holes 9 correspond one-to-one in the height direction.

[0096] Fluid enters the fixed pipe 8 only through the first drain hole 7 and the second drain hole 9 at the same height and opposite to each other. The first drain hole 7 and the second drain hole 9 at the same height form a drain group. By rotating the rotating pipe 6, the fluid in the storage tank 2 is discharged into the second pipeline 102 through the drain groups at different heights.

[0097] This is a further preferred structural form between the rotating tube and the fixed tube of the present invention. The rotating tube is sleeved on the outer periphery of the fixed tube, and one of the plurality of first drain holes and the plurality of second drain holes is arranged alternately in both the vertical and circumferential directions, or both are arranged alternately in both the vertical and circumferential directions, forming a drain hole structure that gradually shifts from top to bottom towards the circumferential side. The other drain hole structure is arranged alternately in the vertical direction or gradually shifts from bottom to top towards the circumferential side. Thus, by rotating the rotating tube, the first and second drain holes at different heights can be connected, achieving the purpose and effect of controlling the change of the drain height of the liquid storage tank according to the compressor frequency. This solves the problem of refrigerant redundancy caused by the difference in the amount of refrigerant required under different operating conditions of the fluorine pump compression refrigeration system.

[0098] In some implementations...

[0099] The top of the rotating tube 6 is closed and the bottom is open; the top of the fixed tube 8 is also closed and the bottom is open.

[0100] When the rotating tube 6 is sleeved on the outer periphery of the fixed tube 8, the lower end of the fixed tube 8 extends out of the outside of the liquid storage tank 2 to communicate with the second pipeline 102. The part of the bottom of the liquid storage tank 2 that allows the fixed tube 8 to pass through is the first outlet 12. The part of the fixed tube 8 opposite to the bottom of the liquid storage tank 2 is fixedly connected to the bottom of the liquid storage tank 2.

[0101] Alternatively, when the fixed tube 8 is sleeved around the outer periphery of the rotating tube 6, the lower end of the rotating tube 6 extends out of the outside of the storage tank 2 to communicate with the second pipeline 102. The part of the bottom of the storage tank 2 that allows the rotating tube 6 to pass through is the first outlet 12. The part of the rotating tube 6 opposite to the bottom of the storage tank 2 is fixedly connected to the bottom of the storage tank 2.

[0102] This is a further preferred structural form of the rotating tube and the fixed tube of the present invention, that is, both are formed as a structure with a closed upper end and an open lower end. The lower end of the fixed tube or the rotating tube extends outside the first liquid outlet of the liquid storage tank, thereby effectively communicating with the second pipeline. This ensures that the refrigerant liquid in the liquid storage tank can be discharged into the second pipeline outside the liquid storage tank by passing through the rotating tube and the fixed tube in sequence (or through the fixed tube and the rotating tube in sequence). By selecting drain holes of different heights between the rotating tube and the fixed tube, the effect of draining liquid at different heights according to the compressor frequency is achieved. The part of the fixed tube opposite to the bottom of the liquid storage tank is preferably fixedly connected to the bottom of the liquid storage tank, thereby forming a fixing effect on the fixed tube.

[0103] The present invention adds a vertically arranged fixed pipe inside the liquid storage tank, which has a plurality of second drain holes arranged at intervals in the same vertical direction. The top of the fixed pipe is closed and close to the top of the liquid storage tank, and the bottom of the fixed pipe is an open pipe that extends out of the liquid storage tank body. The connection between the fixed pipe and the bottom of the liquid storage tank is preferably welded and sealed. The inside of the liquid storage tank is connected to the outside of the liquid storage tank through the second drain holes and the pipe opening at the bottom of the fixed pipe.

[0104] In some implementations...

[0105] When the rotating tube 6 is sleeved on the outer periphery of the fixed tube 8, there is a gap between the inner peripheral wall of the rotating tube 6 and the outer peripheral wall of the fixed tube 8. The size of the gap is 0.01 to 0.2 mm. A sealing material is provided on the outer peripheral surface of the fixed tube 8 and / or the inner peripheral surface of the rotating tube 6. The sealing material avoids the first drain hole 7 and the second drain hole 9.

[0106] Alternatively, when the fixed tube 8 is sleeved on the outer periphery of the rotating tube 6, there is a gap between the outer peripheral wall of the rotating tube 6 and the inner peripheral wall of the fixed tube 8, the size of which is 0.01 to 0.2 mm; a sealing material is provided on the inner peripheral surface of the fixed tube 8 and / or the outer peripheral surface of the rotating tube 6, the sealing material avoiding the first drain hole 7 and the second drain hole 9.

[0107] This invention also ensures that the rotating tube and the fixed tube can rotate relative to each other by using the gap between the inner circumferential wall of the rotating tube and the outer circumferential wall of the fixed tube (or the gap between the outer circumferential wall of the rotating tube and the inner circumferential wall of the fixed tube). However, this gap cannot be too large, otherwise fluid will enter the gap between the rotating tube and the fixed tube, affecting normal liquid drainage. This ensures that most of the refrigerant liquid can only flow through the connected first and second drain holes. In addition, it can also ensure that the inner and outer tubes maintain a relatively stable structural relationship, because the rotating outer tube is driven to rotate by electromagnetic force. If the gap is too large, it is easy to cause shaking and impact. If the gap is too large, more sealing material is required. Using sealing material can fill the gap distance, reduce the fluid entering the gap between the rotating tube and the fixed tube, prevent excessive leakage of liquid refrigerant from the gap distance, and ensure that the fluid enters the fixed tube normally for normal liquid drainage.

[0108] The fixed tube of the present invention has a plurality of second drain holes spaced apart in the same vertical direction. The interior of the liquid storage tank is connected to the exterior of the liquid storage tank through the second drain holes and the opening at the bottom of the fixed tube. The second drain holes penetrate the sealing material. Figure 3-4 As shown, the rotating tube of the present invention is further provided with a plurality of first drain holes and corresponds one-to-one with the plurality of second drain holes in the height direction, and the first drain holes penetrate the sealing material.

[0109] In some implementations...

[0110] When the rotating tube 6 is sleeved on the outer periphery of the fixed tube 8, a sensing protrusion 14 is also connected to the top end of the rotating tube 6.

[0111] The inner top of the liquid storage tank 2 protrudes upward to form a receiving groove 15. At least a portion of the structure of the sensing protrusion 14 is inserted into the receiving groove 15. The receiving groove 15 protrudes upward on the outside of the liquid storage tank 2 to form a mounting protrusion 16. An electromagnetic coil 17 is provided on the mounting protrusion 16. The sensing protrusion 14 is made of magnetic material or has magnetic material on it. When the electromagnetic coil 17 is energized, it can generate a magnetic field to drive the sensing protrusion 14 to rotate, thereby driving the rotating tube 6 to rotate as a whole.

[0112] The present invention also utilizes a sensing protrusion at the top of the rotating tube and a receiving groove formed by an upward-facing protrusion inside the liquid storage tank. This allows the sensing protrusion to be inserted into the receiving groove. Simultaneously, an electromagnetic coil installed at the mounting protrusion outside the receiving groove can generate a magnetic field, thereby driving the sensing protrusion to rotate the rotating tube as a whole. This effectively drives the rotating tube to a suitable position according to the compressor frequency, selecting the first and second drain holes at appropriate heights to drain the liquid. This ensures that sufficient refrigerant liquid enters the system at that frequency, guaranteeing normal cooling and heating performance, while also preventing excessive refrigerant from entering the system and causing refrigerant redundancy.

[0113] This invention designs an adjustable-height refrigerant outlet within the receiver tank, allowing the refrigerant outlet to rise and fall with different operating frequencies under compression refrigeration mode. This, in turn, changes the amount of refrigerant liquid retained in the receiver tank, ensuring optimal refrigerant circulation under various operating conditions. It effectively regulates the optimal refrigerant circulation under different conditions with minimal additional control hardware and software. Only an adjustable rotating control component, similar to an electronic expansion valve (i.e., a mounting protrusion), needs to be added within the receiver tank. An electromagnetic coil drives this rotating component to rotate at different angles, achieving different orifice connections, resulting in high reliability. Because optimal refrigerant circulation is guaranteed under different operating conditions, there is no retained refrigerant liquid obstructing the heat exchanger's piping space, allowing the heat exchanger to fully utilize its heat exchange capacity. This leads to higher energy efficiency in the refrigeration system during low-frequency operation, effectively solving the refrigerant redundancy problem caused by differences in refrigerant charge amounts under different operating conditions in refrigerant pump compression refrigeration systems, and resolving the issues of refrigerant liquid retention and release.

[0114] In some implementations...

[0115] The electromagnetic coil 17 has a ring structure and is sleeved on the outer periphery of the mounting protrusion 16. When the electromagnetic coil 17 is energized in the forward direction, it realizes the clockwise rotation of the rotating tube 6, and when the electromagnetic coil 17 is energized in the reverse direction, it realizes the counterclockwise rotation of the rotating tube 6; or when the electromagnetic coil 17 is energized in the forward direction, it realizes the counterclockwise rotation of the rotating tube 6, and when the electromagnetic coil 17 is energized in the reverse direction, it realizes the clockwise rotation of the rotating tube 6.

[0116] This is a further preferred structural form of the electromagnetic coil of the present invention. By forming a ring structure and sleeved on the outer periphery of the mounting protrusion, a closed magnetic field can be formed on the mounting protrusion, thereby effectively driving the induction protrusion to rotate. Furthermore, the electromagnetic coil of the present invention can be energized in both the forward and reverse directions, thereby enabling the clockwise and counterclockwise rotation of the rotating tube, respectively.

[0117] This invention incorporates an adjustable, rotatable control component, similar to an electronic expansion valve (with a mounting protrusion), within the storage tank. An electromagnetic coil drives a rotating tube inside the tank to rotate at different angles. The rotating tube has multiple first drain holes that correspond one-to-one with second drain holes in the height direction. The rotating tube is fitted over the outer surface of a fixed tube, with a small gap between them. By rotating the rotating tube at different angles under electromagnetic force, the same height of the first drain holes can be achieved, connecting them to the second drain holes.

[0118] like Figure 2 As shown, the liquid storage tank of the present invention is used to adjust the redundancy difference between different refrigerant circulation volumes under various operating conditions, that is, the liquid level of the refrigerant in the liquid storage tank will change, causing the amount of refrigerant stored in it to change.

[0119] The liquid storage tank 2 includes an inlet 26 at the top, a first outlet 12 and a second outlet 25 at the bottom, and also includes a sealing tube (installation protrusion 16), an electromagnetic coil 17, a rotating tube 6 and a fixing tube 8. The installation protrusion 16 is preferably welded and sealed to the top of the liquid storage tank 2.

[0120] The electromagnetic coil 17 of the present invention is fixedly sleeved on the outside of the sealing tube. The magnetic force generated by the electromagnetic coil when energized passes through the sealing tube and drives the rotating tube inside it, causing the rotating tube to rotate. The sealing tube protruding from the top of the liquid storage tank is the valve body.

[0121] In some implementations...

[0122] The top of the mounting protrusion 16 is a solid structure, making the receiving groove 15 a blind groove structure with the upper end closed. The rotating tube 6, the fixed tube 8 and the receiving groove 15 are all arranged coaxially, and their axial direction is arranged in the vertical direction.

[0123] This is a further preferred structural form of the mounting protrusion of the present invention, namely a blind groove structure with the upper end closed, which can limit the upward movement of the upper end of the rotating tube. Furthermore, the rotating tube, the fixed tube, and the receiving groove of the present invention are all arranged coaxially, and it is even more preferred that the axis is arranged coaxially along the vertical direction, so that the rotating tube can be driven to rotate around the axis and avoid deviation.

[0124] In some implementations...

[0125] It also includes a bearing assembly 13, which is disposed at the inner bottom of the liquid storage tank 2. When the rotating tube 6 is sleeved on the outer periphery of the fixed tube 8, the bearing assembly 13 is in contact with the outer periphery of the rotating tube 6. When the fixed tube 8 is sleeved on the outer periphery of the rotating tube 6, the bearing assembly 13 is in contact with the inner periphery of the rotating tube 6, so as to support the rotating tube 6 to rotate inside the liquid storage tank 2.

[0126] The present invention also provides a bearing assembly to support the rotation of the rotating tube, ensuring that the rotating tube can rotate normally inside the liquid storage tank. The bearing assembly of the present invention is preferably fixedly disposed at the bottom of the liquid storage tank, and the inner side of the bearing assembly is preferably interference-fitted onto the outer side of the rotating tube. The rotating tube is fixedly supported on the bearing assembly in the height direction and can rotate freely around the vertical axis.

[0127] In some implementations...

[0128] When the rotating tube 6 is sleeved on the outer periphery of the fixed tube 8, a stop rod 18 is provided on the outer periphery of the rotating tube 6 in a radially outward manner, and a positioning post 19 is provided on the bearing assembly 13 in an upward manner. The positioning post 19 can lock the stop rod 18 to limit the rotation of the rotating tube 6.

[0129] The present invention also uses a stop rod on the outer periphery of the rotating tube and a positioning post on the bearing assembly to limit the rotation of the rotating tube, so that the rotating tube can only rotate 360°, that is, 360° in the forward direction and 360° in the reverse direction. Since multiple first drainage holes are arranged within a 360° circumferential range, the rotating tube is restricted to rotating within a 360° range. The drainage holes at the upper or lower end can be connected according to the initial locking position. Thus, the rotation of the rotating tube can be controlled by a certain angle according to the circumferential distance or angle between two adjacent first drainage holes, so as to achieve the connection of the first and second drainage holes at the required height and achieve precise control.

[0130] In some implementations...

[0131] From top to bottom, when the rotating tube 6 rotates clockwise until the stop rod 18 connects with the positioning post 19, the first drain hole 7 at the bottom of the rotating tube 6 and the second drain hole 9 at the bottom of the fixed tube 8 are opposite to and connected. The other first drain holes 7 and other second drain holes 9 are not connected. As the rotating tube 6 rotates counterclockwise, from bottom to top along the vertical direction, the first drain holes 7 and second drain holes 9 at different heights are successively opposite to and connected. When the rotating tube 6 rotates counterclockwise until the stop rod 18 connects with the positioning post 19 again, the first drain hole 7 at the top and the second drain hole 9 at the top are opposite to and connected.

[0132] Alternatively, from top to bottom, when the rotating tube 6 rotates clockwise until the stop rod 18 connects with the positioning post 19, the first drain hole 7 at the top of the rotating tube 6 is opposite to and connected with the second drain hole 9 at the top of the fixed tube 8. The other first drain holes 7 and other second drain holes 9 are not connected. As the rotating tube 6 rotates counterclockwise, from top to bottom in the vertical direction, the first drain holes 7 and second drain holes 9 at different heights are sequentially connected. When the tube rotates counterclockwise until the stop rod 18 connects with the positioning post 19 again, the first drain hole 7 at the bottom is opposite to and connected with the second drain hole 9 at the bottom.

[0133] This is a further preferred structural form of the refrigeration system with refrigerant redundancy adjustment function of the present invention. Specifically, when rotated clockwise until the stop rod connects with the positioning column, the first and second drain holes at the bottom are connected. Alternatively, the first and second drain holes at the top are connected at this time. Then, by rotating counterclockwise, the first and second drain holes are sequentially aligned and connected vertically from bottom to top or from top to bottom. This allows the rotating tube to be controlled to rotate at a specified angle according to the compressor frequency, achieving connection of the first and second drain holes at a specified height and completing the drainage effect at the specified height. This ensures that sufficient refrigerant liquid enters the system at this frequency, guaranteeing normal cooling and heating performance, while also preventing excessive refrigerant from entering the system and causing refrigerant redundancy.

[0134] like Figure 2 As shown, a stop rod is fixedly provided on the outer side of the rotating tube of the present invention near the bearing assembly, and a positioning post is fixedly provided on the upper end face of the bearing assembly. When the rotating tube rotates one revolution, the stop rod contacts the positioning post once, preventing the rotating tube from continuing to rotate in the original direction. After the direction of the electromagnetic coil is changed, the rotating tube rotates one revolution in the opposite direction, and the stop rod and the positioning post contact each other again, preventing the rotating tube from continuing to rotate.

[0135] In this invention, when the stop rod and the positioning post are in contact during forward energization, the second drain hole and the first drain hole at the lowest position are aligned and connected to each other. When the power is reversed, the contact is released, and the height of the connected second drain hole and the first drain hole gradually increases until the stop rod and the positioning rod are in contact again, at which point the second drain hole and the first drain hole at the highest position are aligned and connected to each other.

[0136] In some implementations...

[0137] In the plane in which the rotating tube 6 unfolds circumferentially, the circumferential distance between two adjacent first drain holes 7 is L, and the length of each first drain hole 7 in the circumferential direction is also L. The circumference of the rotating tube 6 is D, and D = 2nL, where n is the number of first drain holes 7.

[0138] The first and second drain holes of this invention are preferably the same in size and shape. The first drain holes are evenly spaced on the annulus of the horizontal projection of the rotating tube. The arc length between two adjacent first drain holes is equal to the arc length of the first drain hole, i.e., D = 2nL, where D is the horizontal circumference of the rotating tube, n is the number of first drain holes (which is also the number of second drain holes, and the two numbers are equal), and L is the horizontal width of the first drain hole in the circumferential direction. This allows for the effective calculation of the horizontal length of the first and second drain holes (the second drain hole is preferably identical in structure and size to the first drain hole) based on the circumference of the rotating tube, as well as the calculation of the horizontal distance between two adjacent first drain holes and two adjacent second drain holes, thus achieving precise layout and design.

[0139] In some implementations...

[0140] Within the plane in which the rotating tube 6 unfolds circumferentially, the first drain hole 7 is rectangular, rhomboid, circular, or elliptical in shape, and the second drain hole 9 is rectangular, rhomboid, circular, or elliptical in shape, the same as the first drain hole 7.

[0141] This is the preferred structural shape of the first and second drain holes of the present invention. The two are preferably identical in structure and shape, which can ensure that the fluid flows from the first drain hole to the second drain hole in sequence, avoiding blockage and other situations.

[0142] In some implementations...

[0143] It also includes an evaporator 5 and a throttle valve 4. One end of the second pipeline 102 is connected to the interior of the fixed pipe 8 and the other end is connected to the evaporator 5. The throttle valve 4 is provided on the second pipeline 102 so that the refrigerant in the liquid storage tank 2 can be discharged to the throttle valve 4.

[0144] The first pipe 101 is connected to the liquid storage tank 2 at the top of the liquid storage tank 2, and the other end of the first pipe 101 extends downward from the top of the liquid storage tank 2 into the liquid storage tank 2.

[0145] This is a further preferred structural form of the refrigeration system with refrigerant redundancy adjustment function of the present invention. The refrigerant liquid inside the liquid storage tank can be discharged through the second pipeline. The first pipeline of the present invention is preferably inserted into the liquid storage tank from the top downward to provide refrigerant to the liquid storage tank.

[0146] In some implementations...

[0147] The refrigeration system is a refrigerant pump compression refrigeration system, which also includes a refrigerant pump 10, a one-way valve A11, and a third pipeline 103. The one-way valve A11 is installed on the second pipeline 102 and only allows fluid to flow from the liquid storage tank 2 to the second pipeline 102. The bottom of the liquid storage tank 2 is also provided with a second liquid outlet 25. One end of the third pipeline 103 is connected to the inner bottom of the liquid storage tank 2 through the second liquid outlet 25, and the other end is connected to the position on the second pipeline 102 located between the one-way valve A11 and the throttle valve 4. The refrigerant pump 10 is installed on the third pipeline 103.

[0148] This is a preferred structural form of the refrigeration system of the present invention, namely a fluorine pump compression refrigeration system including a fluorine pump. The fluorine pump of the present invention is connected to the bottom of the liquid storage tank through a third pipeline, thereby ensuring that when operating in fluorine pump mode, there is a larger or more refrigerant entering the system (compared to the compression refrigeration mode), or that the maximum refrigerant participating in the system operation in compression refrigeration mode is equal to the refrigerant in fluorine pump mode.

[0149] This invention features an adjustable refrigerant outlet within the liquid storage tank, allowing the refrigerant outlet to rise and fall with different operating frequencies under compression refrigeration mode. This, in turn, changes the amount of refrigerant liquid remaining in the liquid storage tank, ensuring optimal refrigerant circulation for the compression refrigeration system under various operating conditions.

[0150] like Figure 1 As shown, the refrigerant pump compression refrigeration system consists of a compressor 1, a condenser 3, a liquid receiver 2, a refrigerant pump 10, a throttle valve 4, and an evaporator 5 connected in sequence. The liquid receiver 2 has at least two refrigerant liquid outlets (a first liquid outlet 12 and a second liquid outlet 25) and one inlet 26.

[0151] The fluorine pump compression refrigeration system also includes a one-way valve A11. The second outlet 25 of the liquid storage tank 2 is connected to the inlet of the fluorine pump, the first outlet 12 is connected to the inlet of the one-way valve A11, and the outlet of the one-way valve A11 is connected between the outlet of the fluorine pump and the inlet of the throttle valve 4.

[0152] The fluorine pump compression refrigeration system also includes a one-way valve B21, which is connected in parallel to bypass the compressor 1. The inlet and outlet of the one-way valve B21 are connected to the suction port and discharge port of the compressor 1, respectively. The flow direction of the one-way valve B21 is only allowed from the inlet of the compressor 1 to the outlet of the compressor 1.

[0153] The refrigerant pump compression refrigeration system also includes an oil separator 22 and a capillary tube 23 for oil return. The oil separator 22 is connected between the exhaust port of the compressor 1 and the inlet of the condenser 3. The inlet of the oil separator 22 is connected to the exhaust port of the compressor 1, and the outlet of the oil separator 22 is connected to the inlet of the condenser 3. The capillary tube 23 is connected between the oil outlet of the oil separator 22 and the suction port of the compressor 1.

[0154] The present invention also provides a control method for a refrigeration system with refrigerant redundancy adjustment function as described above, comprising:

[0155] The testing steps include checking whether the operating mode is compression refrigeration mode or refrigerant pump refrigeration mode. When it is in compression refrigeration mode, the operating frequency of the compressor is also checked.

[0156] The judgment step is to determine whether the current frequency detection value of the compressor is increased or decreased relative to its previous frequency detection value;

[0157] The control steps are as follows: when the current frequency detection value increases relative to the previous frequency detection value, the rotating tube 6 is controlled to lower the height of the first drain hole 7 during drainage; when the current frequency detection value decreases relative to the previous frequency detection value, the rotating tube 6 is controlled to raise the height of the first drain hole 7 during drainage.

[0158] This invention designs an adjustable-height refrigerant outlet within the storage tank, allowing the height of the first discharge hole in the rotating tube to rise and fall with different operating frequencies under compression refrigeration mode. This, in turn, changes the amount of refrigerant liquid retained in the storage tank, ensuring optimal refrigerant circulation under various operating conditions. It effectively adjusts the optimal refrigerant circulation under different conditions with minimal additional control hardware and software, resulting in high reliability. Because it guarantees optimal refrigerant circulation under all conditions, there is no retained refrigerant liquid encroaching on the heat exchanger's piping space, allowing the heat exchanger to fully utilize its heat exchange capacity. This leads to higher energy efficiency in the refrigeration system during low-frequency operation, effectively solving the refrigerant redundancy problem caused by differences in refrigerant charge amounts under different operating conditions in refrigerant pump compression refrigeration systems, and addressing the issues of refrigerant liquid retention and release.

[0159] In some implementations...

[0160] When there are multiple first drain holes 7 and each also has an electromagnetic coil 17:

[0161] The control method also includes a calculation step, which calculates the time required for the rotating tube 6 to rotate one revolution as t0, and calculates the target discharge height of the first discharge hole 7 according to the operating frequency of the compressor.

[0162] The control steps involve first energizing the electromagnetic coil in either the forward or reverse direction for a time t≥t0, so that the first drain hole 7 located at the lowest or highest point is open and drains liquid. Then, the electromagnetic coil 17 is energized in either the reverse or forward direction to rotate the rotating tube 6 by a preset angle, and the liquid is drained through the first drain hole 7 with the target drain height.

[0163] This is a further preferred control method of the present invention, namely, firstly, the electromagnetic coil is energized in the forward or reverse direction for a time t≥t0, so that the first drain hole 7 located at the lowest or highest position is connected and drains liquid, thereby forming a reset action, so that the drain height is at the lowest or highest position. Then, the electromagnetic coil is controlled to be energized in the reverse or forward direction, so that the rotating tube rotates by a preset angle, so that the first and second drain holes at the target drain height are connected. Drainage is carried out at the target drain height, ensuring that there is enough refrigerant liquid entering the system at this frequency, ensuring normal cooling and heating performance, while avoiding excessive refrigerant entering the system and causing refrigerant redundancy, thus achieving precise matching between frequency and drain height.

[0164] This invention provides a control method for a refrigerant pump compression refrigeration system. The time required for the rotating tube to rotate one revolution is t0. Then, the forward energizing time of the starting electromagnetic coil is t≥t0, ensuring that the stop rod and the positioning column are in contact so that the second drain hole and the first drain hole at the lowest position are aligned and connected. This is a reset action, and it also ensures that refrigerant liquid flows out of the first liquid outlet 12. Then, the corresponding height of the required connecting hole is calculated according to the operating frequency range of the compressor, and then the reverse energizing is applied to make the rotating tube rotate a certain angle so that the second drain hole and the first drain hole at that height are aligned and connected.

[0165] Figure 1 Working principle:

[0166] In compression refrigeration mode, the refrigerant pump is off and the compressor is on. The rotation angle of the rotating tube is adjusted by the electromagnetic coil according to different operating frequency ranges, so that the second drain hole and the first drain hole at the same height are aligned and connected. After the liquid inside the receiver tank reaches the connecting hole, it enters the fixed pipe and flows out from the first liquid outlet 12 at the bottom of the fixed pipe. Therefore, the refrigerant liquid remaining in the receiver tank will change, thereby solving the problem of matching the optimal refrigerant circulation volume under different operating conditions. The higher the operating frequency range of the compressor, the lower the height of the connected second drain hole and the first drain hole.

[0167] In refrigerant pump refrigeration mode, the refrigerant pump is turned on and the compressor is turned off. Because there is a reverse pressure difference between the two ends of the one-way valve A at this time, it cannot be connected. Therefore, there is no restriction on the relationship between the rotating tube and the fixed tube. That is, whether the second drain hole and the first drain hole at the same height are connected is not mandatory.

[0168] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A refrigeration system with refrigerant redundancy adjustment function, characterized in that: include: The compressor (1), liquid receiver (2), condenser (3), first pipeline (101), second pipeline (102), and rotary tube (6) are provided. One end of the first pipeline (101) is connected to the condenser (3), and the other end is connected to the interior of the liquid receiver (2) so that the refrigerant that has undergone heat exchange in the condenser (3) can be introduced into the liquid receiver (2). The rotary tube (6) is located inside the liquid receiver (2), and a first drain hole (7) is provided on the rotary tube (6). The liquid refrigerant in the rotary tube (6) can enter the rotary tube (6) through the first drain hole (7) and be further discharged to the second pipeline (102). The height of the first drain hole (7) of the rotary tube (6) when draining liquid changes with the frequency of the compressor (1). The higher the frequency of the compressor (1), the lower the height of the first drain hole (7) of the rotary tube (6) when draining liquid, and vice versa. There are multiple first drain holes (7), and the multiple first drain holes (7) are arranged sequentially at intervals along the height direction of the rotating tube (6). The rotating tube (6) drains liquid through at least one of the first drain holes (7) at different heights. The higher the frequency of the compressor (1), the lower the height of the first drain hole (7) of the rotating tube (6) for draining liquid, and vice versa. It also includes a fixed tube (8), which is sleeved between the fixed tube (8) and the rotating tube (6). The rotating tube (6) is sleeved on the outer periphery of the fixed tube (8) or the fixed tube (8) is sleeved on the outer periphery of the rotating tube (6). The fixed tube (8) is provided with a plurality of second drain holes (9) along the height direction. Multiple first drain holes (7) are arranged at intervals along the height direction and also at intervals along the circumferential direction. The rotating tube (6) is a cylindrical structure, and the unfolded surface of its outer circumference is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drain holes (7) are arranged at intervals. In the projection of the short side, multiple first drain holes (7) are also arranged at intervals. Multiple second drain holes (9) are arranged at intervals only along the vertical direction on the fixed tube (8). The first drain holes (7) and the second drain holes (9) correspond one-to-one in the height direction. Alternatively, multiple second drain holes (9) are arranged at intervals along the height direction and also at intervals along the circumferential direction. The fixed tube (8) is a cylindrical structure, and the unfolded surface of its outer circumference is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple second drain holes (9) are arranged at intervals. In the projection of the short side, multiple second drain holes (9) are also arranged at intervals. Multiple first drain holes (7) are arranged at intervals only along the vertical direction on the rotating tube (6). The first drain holes (7) and the second drain holes (9) correspond one-to-one in the height direction. Alternatively, multiple first drain holes (7) are arranged at intervals along the first height direction and also at intervals along the first circumferential direction. The rotating tube (6) is a cylindrical structure, and the unfolded surface of its outer circumference is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of the long side, multiple first drain holes (7) are arranged at intervals, and in the projection of the short side, multiple first drain holes (7) are also arranged at intervals. Multiple second drain holes (9) are arranged at intervals along the second height direction. At the same time, the fixed tube (8) is arranged in sequence at intervals along the first circumferential direction. The fixed tube (8) is a cylindrical structure, and the unfolded surface of its outer circumferential surface is a rectangular structure, including a long side extending along the height direction and a short side extending along the circumferential direction. The length of the long side is greater than or equal to the length of the short side. In the projection of its long side, a plurality of second drain holes (9) are arranged in sequence at intervals. In the projection of its short side, a plurality of second drain holes (9) are also arranged in sequence at intervals. The second height direction is opposite to the first height direction. The first drain hole (7) and the second drain hole (9) correspond one-to-one in the height direction. By rotating the rotating tube (6), the first drain hole (7) and the second drain hole (9) at the same height are opposite to and connected, so that the fluid in the storage tank (2) is discharged into the second pipeline (102) only through the first drain hole (7) and the second drain hole (9) at the same height.

2. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: Multiple first drain holes (7) are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube (6), there are no more than two overlapping first drain holes (7). In the short side projection of the outer circumferential surface of the rotating tube (6), there are also no more than two overlapping first drain holes (7). Multiple second drain holes (9) are arranged at intervals only along the vertical direction. The first drain holes (7) and the second drain holes (9) correspond one-to-one in the height direction. Alternatively, multiple second drain holes (9) are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube (8), there are no more than two overlapping second drain holes (9). In the short side projection of the outer circumferential surface of the fixed tube (8), there are also no more than two overlapping second drain holes (9). Multiple first drain holes (7) are arranged at intervals only along the vertical direction. The first drain holes (7) and the second drain holes (9) correspond one-to-one in the height direction. Alternatively, multiple first drain holes (7) are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the rotating tube (6), there are no more than two overlapping first drain holes (7). In the short side projection of the outer circumferential surface of the rotating tube (6), there are also no more than two overlapping first drain holes (7). Multiple second drain holes (9) are arranged at intervals along the height direction and also at intervals along the circumferential direction. In the long side projection of the outer circumferential surface of the fixed tube (8), there are no more than two overlapping second drain holes (9). In the short side projection of the outer circumferential surface of the fixed tube (8), there are also no more than two overlapping second drain holes (9). The first drain holes (7) and the second drain holes (9) correspond one-to-one in the height direction. Fluid enters the fixed pipe (8) only through the first drain hole (7) and the second drain hole (9) at the same height and opposite to each other. The first drain hole (7) and the second drain hole (9) at the same height form a drain group. By rotating the rotating pipe (6), the fluid in the storage tank (2) is discharged into the second pipeline (102) through the drain groups at different heights.

3. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: The top of the rotating tube (6) is closed and the bottom is open. The top of the fixed tube (8) is also closed and the bottom is open. When the rotating tube (6) is sleeved on the outer periphery of the fixed tube (8), the lower part of the fixed tube (8) extends out of the outside of the liquid storage tank (2) to communicate with the second pipeline (102). The part of the bottom of the liquid storage tank (2) that allows the fixed tube (8) to pass through is the first outlet (12). The part of the fixed tube (8) opposite to the bottom of the liquid storage tank (2) forms a fixed connection with the bottom of the liquid storage tank (2). Alternatively, when the fixed tube (8) is sleeved on the outer periphery of the rotating tube (6), the lower end of the rotating tube (6) extends out of the outside of the storage tank (2) to communicate with the second pipeline (102). The part of the bottom of the storage tank (2) that allows the rotating tube (6) to pass through is the first outlet (12). The part of the rotating tube (6) opposite to the bottom of the storage tank (2) is fixedly connected to the bottom of the storage tank (2).

4. The refrigeration system with refrigerant redundancy adjustment function according to any one of claims 1-3, characterized in that: When the rotating tube (6) is sleeved on the outer periphery of the fixed tube (8), there is a gap between the inner peripheral wall of the rotating tube (6) and the outer peripheral wall of the fixed tube (8), and the size of the gap is 0.01~0.2mm; a sealing material is provided on the outer peripheral surface of the fixed tube (8) and / or the inner peripheral surface of the rotating tube (6), and the sealing material avoids the first drain hole (7) and avoids the second drain hole (9). Alternatively, when the fixed tube (8) is sleeved on the outer periphery of the rotating tube (6), there is a gap between the outer peripheral wall of the rotating tube (6) and the inner peripheral wall of the fixed tube (8), the size of which is 0.01~0.2mm; a sealing material is provided on the inner peripheral surface of the fixed tube (8) and / or the outer peripheral surface of the rotating tube (6), the sealing material avoiding the first drain hole (7) and avoiding the second drain hole (9).

5. The refrigeration system with refrigerant redundancy adjustment function according to any one of claims 1-3, characterized in that: When the rotating tube (6) is sleeved on the outer periphery of the fixed tube (8), the top end of the rotating tube (6) is also connected to a sensing protrusion (14). The inner top of the liquid storage tank (2) protrudes upward to form a receiving groove (15). At least a part of the structure of the sensing protrusion (14) is inserted into the receiving groove (15). The receiving groove (15) protrudes upward on the outside of the liquid storage tank (2) to form a mounting protrusion (16). An electromagnetic coil (17) is provided on the mounting protrusion (16). The sensing protrusion (14) is made of magnetic material or is provided with magnetic material. When the electromagnetic coil (17) is energized, it can generate a magnetic field to drive the sensing protrusion (14) to rotate, thereby driving the rotating tube (6) to rotate as a whole.

6. The refrigeration system with refrigerant redundancy adjustment function according to claim 5, characterized in that: The electromagnetic coil (17) is a ring structure and is sleeved on the outer periphery of the mounting protrusion (16). When the electromagnetic coil (17) is energized in the forward direction, the rotating tube (6) rotates clockwise. When the electromagnetic coil (17) is energized in the reverse direction, the rotating tube (6) rotates counterclockwise. Alternatively, when the electromagnetic coil (17) is energized in the forward direction, the rotating tube (6) rotates counterclockwise. When the electromagnetic coil (17) is energized in the reverse direction, the rotating tube (6) rotates clockwise.

7. The refrigeration system with refrigerant redundancy adjustment function according to claim 5, characterized in that: The top of the mounting protrusion (16) is a solid structure, making the receiving groove (15) a blind groove structure with the upper end closed. The rotating tube (6), the fixed tube (8) and the receiving groove (15) are all arranged coaxially, and their axial direction is arranged in the vertical direction.

8. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: It also includes a bearing assembly (13), which is disposed at the inner bottom of the liquid storage tank (2). When the rotating tube (6) is sleeved on the outer periphery of the fixed tube (8), the bearing assembly (13) is connected to the outer periphery of the rotating tube (6). When the fixed tube (8) is sleeved on the outer periphery of the rotating tube (6), the bearing assembly (13) is connected to the inner periphery of the rotating tube (6), so as to support the rotating tube (6) to rotate inside the liquid storage tank (2).

9. The refrigeration system with refrigerant redundancy adjustment function according to claim 8, characterized in that: When the rotating tube (6) is sleeved on the outer periphery of the fixed tube (8), a stop rod (18) is provided on the outer periphery of the rotating tube (6) in a radially outward manner. The bearing assembly (13) is provided with a positioning post (19) protruding upwards. The positioning post (19) can lock the stop rod (18) to limit the rotation of the rotating tube (6).

10. The refrigeration system with refrigerant redundancy adjustment function according to claim 9, characterized in that: From top to bottom, when the rotating tube (6) rotates clockwise until the stop rod (18) connects with the positioning post (19), the first drain hole (7) at the bottom of the rotating tube (6) is opposite to and connected with the second drain hole (9) at the bottom of the fixed tube (8). The other first drain holes (7) and other second drain holes (9) are not connected. As the rotating tube (6) rotates counterclockwise, from bottom to top along the vertical direction, the first drain holes (7) and second drain holes (9) at different heights are connected in sequence. When the rotating tube (6) rotates counterclockwise until the stop rod (18) connects with the positioning post (19) again, the first drain hole (7) at the top of the tube is opposite to and connected with the second drain hole (9) at the top of the tube. Alternatively, from top to bottom, when the rotating tube (6) rotates clockwise until the stop rod (18) connects with the positioning post (19), the first drain hole (7) at the top of the rotating tube (6) is opposite to and connected with the second drain hole (9) at the top of the fixed tube (8). The other first drain holes (7) and other second drain holes (9) are not connected. As the rotating tube (6) rotates counterclockwise, from top to bottom in the vertical direction, the first drain holes (7) and second drain holes (9) at different heights are connected in sequence. When the rotating tube (6) rotates counterclockwise until the stop rod (18) connects with the positioning post (19) again, the first drain hole (7) at the bottom is opposite to and connected with the second drain hole (9) at the bottom.

11. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: In the plane of the rotating tube (6) unfolded in the circumferential direction, the circumferential distance between two adjacent first drain holes (7) is L, and the length of each first drain hole (7) in the circumferential direction is also L. The circumference of the rotating tube (6) is D, and D=2nL, where n is the number of first drain holes (7).

12. The refrigeration system with refrigerant redundancy adjustment function according to claim 1, characterized in that: In the plane of the rotating tube (6) unfolded in the circumferential direction, the shape of the first drain hole (7) is rectangular, rhomboid, circular or elliptical, and the shape of the second drain hole (9) is the same as that of the first drain hole (7), which is rectangular, rhomboid, circular or elliptical.

13. The refrigeration system with refrigerant redundancy adjustment function according to claim 3, characterized in that: It also includes an evaporator (5) and a throttle valve (4). One end of the second pipeline (102) is connected to the interior of the fixed pipe (8) and the other end is connected to the evaporator (5). The throttle valve (4) is installed on the second pipeline (102) so that the refrigerant in the liquid storage tank (2) can be discharged to the throttle valve (4). The first pipe (101) is connected to the liquid storage tank (2) at the top of the liquid storage tank (2), and the other end of the first pipe (101) passes down from the top of the liquid storage tank (2) into the liquid storage tank (2).

14. The refrigeration system with refrigerant redundancy adjustment function according to claim 13, characterized in that: The refrigeration system is a fluorine pump compression refrigeration system, which also includes a fluorine pump (10), a one-way valve A (11) and a third pipeline (103). The one-way valve A (11) is located on the second pipeline (102) and only allows fluid to flow from the liquid storage tank (2) to the second pipeline (102). The bottom of the liquid storage tank (2) is also provided with a second liquid outlet (25). One end of the third pipeline (103) is connected to the bottom of the liquid storage tank (2) through the second liquid outlet (25), and the other end is connected to the position on the second pipeline (102) between the one-way valve A (11) and the throttle valve (4). The fluorine pump (10) is located on the third pipeline (103).

15. A control method for a refrigeration system with refrigerant redundancy adjustment function as described in any one of claims 1-14, characterized in that: include: The testing steps include checking whether the operating mode is compression refrigeration mode or refrigerant pump refrigeration mode. When it is in compression refrigeration mode, the operating frequency of the compressor is also checked. The judgment step is to determine whether the current frequency detection value of the compressor is increased or decreased relative to its previous frequency detection value; The control steps are as follows: when the current frequency detection value increases relative to the previous frequency detection value, the rotating tube (6) is controlled to reduce the height of the first drain hole (7) during drainage; when the current frequency detection value decreases relative to the previous frequency detection value, the rotating tube (6) is controlled to increase the height of the first drain hole (7) during drainage.

16. The control method according to claim 15, characterized in that: When there are multiple first drain holes (7) and each hole also has an electromagnetic coil (17): The control method also includes a calculation step, which calculates the time required for the rotating tube (6) to rotate one revolution as t0, and calculates the target discharge height of the first discharge hole (7) according to the operating frequency of the compressor; The control steps first involve energizing the electromagnetic coil in either the forward or reverse direction for a time t≥t0, so that the first drain hole (7) located at the lowest or highest point is open and drains liquid. Then, the electromagnetic coil (17) is energized in either the reverse or forward direction so that the rotating tube (6) rotates by a preset angle and drains liquid through the first drain hole (7) with the target drain height.

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