A phase change cold storage cabinet for the terminal of a central air conditioner

Abstract

The present invention relates to the field of phase change cold storage cabinets, and discloses a phase change cold storage cabinet for the end of a central air conditioner, which includes a fan coil unit. The fan coil unit has a liquid inlet pipe and a liquid discharge pipe; a box body is provided on the fan coil unit. On one side inside the box body, a liquid inlet box is installed, and on the other side, a liquid discharge box is installed. The liquid inlet box is communicated with the liquid inlet pipe through a communication pipe, and the liquid discharge box is communicated with the liquid discharge pipe through an auxiliary communication pipe and a circulation pump; a phase change material is provided inside the box body. The liquid inlet box and the liquid discharge box are communicated through a plurality of exchange pipes to realize the flow of liquid and heat exchange. A plurality of groups of flow disturbance and cleaning mechanisms are provided inside the exchange pipes. Through the flow disturbance and cleaning mechanism and the magnetic component, when water is flowing, the moving part moves along the pipe length direction by the magnetic action, scrapes the inner wall and changes the water flow direction, improving the heat exchange efficiency and the water temperature uniformity. At the same time, the magnetic field enhances the activity of calcium and magnesium ions in the water, reduces the attachment of water scale, and when the water stops flowing, the moving part moves back to clean the inner wall again, ensuring the heat exchange effect.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change cold storage cabinets, and more specifically, it relates to a phase change cold storage cabinet for the end of a central air conditioner. Background Art

[0002] Central air conditioning systems are widely used in large buildings and are favored for their efficient operation and centralized control. However, they face problems of low efficiency and insufficient adjustment flexibility during low-load and overtime periods. Property management often adopts a simple strategy of turning off the central air conditioner during non-working hours, which may lead to an uncomfortable office environment during overtime. Although employees can request the air conditioner to be turned on during overtime, they have to bear high costs, and due to the small load, the efficiency of the refrigeration host decreases, resulting in serious waste of electric energy, which goes against the concept of energy conservation and environmental protection. With technological progress, people have begun to combine cold storage devices with the end of the central air conditioner. By connecting the supply and return water pipes of the fan coil unit, the energy storage device is charged with cold during working hours, and the relevant valves are closed during non-cooling storage periods. During overtime, the cold storage device and the fan coil unit form a circulating water system to provide cold water for the fan coil unit at the end of the central air conditioner, thus solving the cooling demand during overtime.

[0003] When the cold storage device operates for cold storage, cold water from the central air conditioning system is introduced, and this cold water undergoes temperature changes due to its interaction with the phase change material inside the cold storage device. When the cold storage device is not in use, the water inside it remains stationary for a long time, and this long-term stationary state easily leads to the accumulation of scale in the heat exchange pipes. The formation of scale will hinder the normal progress of subsequent heat exchange and thus weaken the subsequent heat exchange efficiency. Summary of the Invention

[0004] The present invention provides a phase change cold storage cabinet for the end of a central air conditioner, which solves the technical problem that scale forms in the exchange pipes of the phase change cold storage cabinet for the end of the central air conditioner in the related art, thereby reducing subsequent heat exchange.

[0005] The present invention provides a phase change cold storage cabinet for the end of a central air conditioner, including a fan coil unit, and the fan coil unit has a liquid inlet pipe and a liquid discharge pipe;

[0006] A box body is provided on the fan coil unit. On one side inside the box body, a liquid inlet box is installed, and on the other side, a liquid discharge box is installed. The liquid inlet box is communicated with the liquid inlet pipe through a communicating pipe, and the liquid discharge box is communicated with the liquid discharge pipe through an auxiliary communicating pipe and a circulating pump;

[0007] Phase change material is provided inside the box body. The liquid inlet box and the liquid discharge box are communicated through a plurality of exchange pipes to realize the flow of liquid and heat exchange. A plurality of groups of flow disturbance cleaning mechanisms are provided inside the exchange pipes;

[0008] The spoiler cleaning mechanism includes a magnetic fixed part and a magnetic moving part that generate a magnetic field and act on the flowing water body. The magnetic moving part has a first position state and a second position state. In the first position state, the magnetic moving part changes its distance from the magnetic fixed part and generates a spoiler. In the second position state, the magnetic moving part moves towards the magnetic fixed part and cleans the exchange pipe.

[0009] As a further optimized solution of the present invention, the magnetic fixed part includes a mounting ring, a first fixed magnetic ring, and a second fixed magnetic ring. The mounting ring is fixedly sleeved inside the exchange pipe. The first fixed magnetic ring and the second fixed magnetic ring are respectively installed on both sides of the mounting ring. A communicating port is formed in the middle of the mounting ring, the first fixed magnetic ring, and the second fixed magnetic ring, and the diameter of the communicating port gradually increases from the first fixed magnetic ring towards the second fixed magnetic ring.

[0010] As a further optimized solution of the present invention, a connecting ring is installed on the side of the first fixed magnetic ring away from the mounting ring. An axial flow fan blade is rotatably connected inside the connecting ring through a rotating ring.

[0011] As a further optimized solution of the present invention, the magnetic moving part includes a moving block, a first moving magnetic ring, a second moving magnetic ring, and a blocking block. The moving block is slidably sleeved inside the exchange pipe and is provided with an inclined diversion flow channel. The first moving magnetic ring and the second moving magnetic ring are respectively embedded on both sides of the moving block. The first moving magnetic ring has the same magnetism as the first fixed magnetic ring, and the second moving magnetic ring has the opposite magnetism to the second fixed magnetic ring. The blocking block is installed on one side of the moving block. One side of the blocking block is adapted to the communicating port, and the other side is round.

[0012] As a further optimized solution of the present invention, a sliding ring is fixedly sleeved on the outer periphery of the blocking block, and a fluid flow channel inclined in the opposite direction to the diversion flow channel is formed on the sliding ring.

[0013] As a further optimized solution of the present invention, a scraping ring is installed on the side of the first moving magnetic ring. The inner hole diameter value of the scraping ring is the same as the outer diameter of the connecting ring, and the width values of the scraping ring and the connecting ring are the same.

[0014] As a further optimized solution of the present invention, the inside of the box body between adjacent exchange pipes is separated by a partition board.

[0015] As a further optimized solution of the present invention, a first valve is provided on the liquid inlet pipe, a second valve is provided on the liquid discharge pipe, and solenoid valves are provided on both the auxiliary connecting pipe and the communicating pipe.

[0016] As a further optimized solution of the present invention, the outside of the box body is wrapped with a heat insulation layer.

[0017] As a further optimized solution of the present invention, a temperature sensor is provided inside the box body.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In a phase change cold storage cabinet at the end of a central air conditioner according to the present invention, during the heat exchange process, by providing a flow disturbance cleaning mechanism, when liquid water is continuously introduced into the exchange pipe, the flow of the liquid water will interact with the magnetism of the magnetic fixed part and the magnetic moving part. This magnetic interaction will change the distance between the magnetic fixed part and the magnetic moving part, causing the magnetic fixed part to move along the length direction of the exchange pipe. During this process, the magnetic moving part will scrape the inner wall of the exchange pipe and at the same time change the flow direction of the liquid, increasing the uniformity of the liquid water temperature. This design can not only effectively clean the inner wall of the exchange pipe, but also increase the disturbance of the liquid, thereby significantly improving the heat exchange efficiency.

[0020] 2. In a phase change cold storage cabinet at the end of a central air conditioner according to the present invention, through the combined use of the magnetic fixed part and the magnetic moving part, under the action of the generated magnetic field, the activity of calcium and magnesium ions in water is enhanced, and they are easily combined with carbonate ions to form tiny crystals, avoiding attachment to the pipe wall. At the same time, the magnetic field changes the crystal form of calcium carbonate into loose aragonite, which is easily washed away by the water flow. Magnetized water improves the ion solubility and reduces scale. In addition, through the action of electrostatic and Lorentz forces, the magnetic field reduces the adsorption of ions on the inner wall of the pipe when the liquid water is stationary or during heat exchange, preventing scale formation.

[0021] 3. In a phase change cold storage cabinet at the end of a central air conditioner according to the present invention, when the circulation of liquid water in the exchange pipe stops, the magnetic moving part moves back to its initial position. During the moving-back process, the inner wall of the liquid exchange pipe is cleaned again, and at the same time, accompanied by the magnetic effect, the attachment of scale generation is reduced, which is beneficial to the heat exchange effect during re - use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is an overall view of a phase change cold storage cabinet at the end of a central air conditioner proposed by the present invention.

[0023] Figure 2 FIG. is a schematic structural diagram of a phase change cold storage cabinet at the end of a central air conditioner proposed by the present invention.

[0024] Figure 3 FIG. is a schematic cross - sectional structural diagram of a box body in a phase change cold storage cabinet at the end of a central air conditioner proposed by the present invention.

[0025] Figure 4 FIG. is a schematic internal structural diagram of an exchange pipe in a phase change cold storage cabinet at the end of a central air conditioner proposed by the present invention.

[0026] Figure 5 is Figure 4 a partial structural schematic diagram in

[0027] Figure 6Schematic diagram of the split structure of a flow disturbance cleaning mechanism in the phase change cold storage cabinet at the end of a central air conditioner according to the present invention.

[0028] Figure 7 Schematic diagram of the structure when the magnetic moving part moves to another group of magnetic fixed parts during the use state of the phase change cold storage cabinet at the end of a central air conditioner according to the present invention.

[0029] Figure 8 It is Figure 7 Partial schematic diagram of

[0030] In the figure:

[0031] 1. Fan coil unit; 101. Liquid inlet pipe; 102. Liquid discharge pipe;

[0032] 2. Box body;

[0033] 3. Liquid inlet box;

[0034] 4. Liquid discharge box;

[0035] 5. Connecting pipe;

[0036] 6. Auxiliary connecting pipe;

[0037] 7. Circulation pump;

[0038] 8. Exchange pipe;

[0039] 9. Flow disturbance cleaning mechanism;

[0040] 91. Magnetic fixed part; 911. Installation ring; 912. Fixed magnetic ring 1; 913. Fixed magnetic ring 2; 914. Connecting ring; 915. Rotating ring; 916. Axial flow fan blade;

[0041] 92. Magnetic moving part; 921. Moving block; 9211. Diversion flow channel; 922. Moving magnetic ring 1; 923. Moving magnetic ring 2; 924. Sealing block; 925. Sliding ring; 9251. Fluid flow channel; 926. Scraping ring;

[0042] 10. Partition board;

[0043] 11. Valve 1;

[0044] 12. Valve 2;

[0045] 13. Solenoid valve. Specific implementation mode

[0046] Reference will now be made to exemplary embodiments to discuss the subject matter described herein. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. In addition, the features described in some examples can also be combined in other examples.

[0047] As Figures 1 to 4 shown, a phase change energy storage cabinet for the end of a central air conditioner according to an embodiment of the present invention includes a fan coil unit 1, and the fan coil unit 1 has a liquid inlet pipe 101 and a liquid discharge pipe 102;

[0048] A box body 2 is provided on the fan coil unit 1. On one side inside the box body 2, a liquid inlet box 3 is installed, and on the other side, a liquid discharge box 4 is installed. The liquid inlet box 3 is communicated with the liquid inlet pipe 101 through a communication pipe 5, and the liquid discharge box 4 is communicated with the liquid discharge pipe 102 through an auxiliary communication pipe 6 and a circulation pump 7;

[0049] A phase change material (this phase change material is a phase change material that can be converted between a liquid state and a solid state, which is a well-known prior art and will not be elaborated herein) is provided inside the box body 2. The liquid inlet box 3 and the liquid discharge box 4 are communicated through a plurality of exchange pipes 8 to realize the flow of liquid and heat exchange. The exchange pipes 8 are copper pipes, the liquid discharge outlet of the exchange pipes 8 is smaller than its inner diameter, and a plurality of groups of turbulent flow cleaning mechanisms 9 are provided inside the exchange pipes 8;

[0050] The turbulent flow cleaning mechanism 9 includes a magnetic fixed part 91 and a magnetic moving part 92 that generate a magnetic field and act on the flowing water body. The magnetic moving part 92 has a first position state and a second position state. In the first position state, the magnetic moving part 92 changes the distance from the magnetic fixed part 91 and generates turbulent flow. In the second position state, the magnetic moving part 92 moves towards the magnetic fixed part 91 and cleans the exchange pipe 8.

[0051] It should be noted that the liquid inlet pipe 101 of the fan coil unit 1 is used to input liquid (its liquid inlet end is connected to the water supply pipe of the central air conditioner), the liquid discharge pipe 102 is used to discharge liquid, and the liquid discharge end of the liquid discharge pipe 102 is connected to the return pipeline of the central air conditioner. The liquid discharge box 4 is connected to the liquid discharge pipe 102 through the auxiliary pipe 6 and the circulation pump 7. When the circulation pump 7 is started, the liquid in the liquid discharge box 4 can be pumped into the liquid discharge pipe 102. The phase change material in the box body 2 is used to store cold. The liquid inlet box 3 and the liquid discharge box 4 are connected through a plurality of exchange pipes 8. The liquid flows in the exchange pipes 8 and exchanges heat with the phase change material. The flow disturbance cleaning mechanism 9 in the exchange pipes 8 has a magnetic fixed part 91 and a magnetic moving part 92 that generate a magnetic field. When the magnetic moving part 92 is in the first position state, the magnetic moving part 92 and the magnetic fixed part 91 change their relative positions due to magnetism and the action of the liquid, and can scrape the inner wall of the exchange pipe 8. At this time, the magnetic field acts on the flowing water body, and the magnetic moving part 92 causes flow disturbance, increasing the contact effect between the water and the inner wall of the exchange pipe 8. When the magnetic moving part 92 is in the second position state, the magnetic moving part 92 moves towards the magnetic fixed part 91 to clean the inner wall of the exchange pipe 8, reducing the attachment of impurities such as water scale and ensuring the heat exchange effect.

[0052] Referring to Figures 4 to 6 the content, the magnetic fixed part 91 includes an installation ring 911, a first fixed magnetic ring 912 and a second fixed magnetic ring 913. The installation ring 911 is fixedly sleeved inside the exchange pipe 8. The first fixed magnetic ring 912 and the second fixed magnetic ring 913 are respectively installed on both sides of the installation ring 911. A communicating through-hole is formed in the middle of the installation ring 911, the first fixed magnetic ring 912 and the second fixed magnetic ring 913, and the diameter of the through-hole gradually increases from the first fixed magnetic ring 912 towards the second fixed magnetic ring 913.

[0053] It should be noted that the influence of the magnetic field on the formation of water scale:

[0054] Changing the ionic state: Under the action of the magnetic field, the hydration radius of scale-forming ions such as calcium and magnesium in water becomes smaller, and the ionic activity increases. These ions are more likely to combine with carbonate ions to form tiny calcium carbonate or magnesium carbonate crystals, rather than adhering to the inner wall of the pipeline.

[0055] Changing the crystal form: The magnetic field can change the crystal form of calcium carbonate from dense calcite to loose and easily soluble aragonite. This crystal structure is not easily attached to the inner wall of the pipeline and is more easily washed away by the water flow.

[0056] Increasing solubility: Magnetized water treatment can increase the solubility of water, improve the solubility of calcium and magnesium ions in water, and thus reduce the formation of water scale.

[0057] The influence of the magnetic field on the attachment of water scale:

[0058] Electrostatic effect: The inner wall of the pipeline usually carries negative charges, which will adsorb positively charged calcium and magnesium ions, thus forming scale. The magnetic field can reduce the electrostatic adsorption between ions and the inner wall of the pipeline by changing the charge distribution of ions or increasing the activity of water molecules.

[0059] Lorentz force effect: The Lorentz force in the magnetic field can change the movement trajectory of scale ions, making it more difficult for them to adhere to the inner wall of the pipeline.

[0060] Furthermore, a connecting ring 914 is installed on the side of the fixed magnetic ring 912 away from the installation ring 911. An axial flow fan blade 916 is rotatably connected to the inside of the connecting ring 914 through a rotating ring 915.

[0061] It should be noted that when the liquid water enters the exchange pipe 8 from the liquid inlet box 3, it acts on the axial flow fan blade 916, and the axial flow fan blade 916 rotates to turbulently mix the liquid water, increasing the temperature uniformity, and thus facilitating heat exchange.

[0062] Refer to Figures 4 to 8 As shown in the figure, the magnetic moving part 92 includes a moving block 921, a moving magnetic ring 922, a moving magnetic ring 923 and a blocking block 924. The moving block 921 is slidably sleeved inside the exchange pipe 8 and is provided with an inclined diversion channel 9211. The moving magnetic ring 922 and the moving magnetic ring 923 are respectively embedded on both sides of the moving block 921. The moving magnetic ring 922 has the same magnetism as the fixed magnetic ring 912, and the moving magnetic ring 923 has the opposite magnetism to the fixed magnetic ring 913. The blocking block 924 is installed on one side of the moving block 921. One side of the blocking block 924 is adapted to the through port. After the phase change material completes cold storage, the blocking block 924 extends into the through port, and the other side is round; an annular channel is formed between the round side and the inner wall of the exchange pipe 8, so that when the liquid flows, it is close to the inner peripheral wall of the exchange pipe 8, increasing heat exchange and temperature uniformity.

[0063] Furthermore, a sliding ring 925 is fixedly sleeved on the outer periphery of the blocking block 924. When the sliding ring 925 moves along the length direction of the exchange pipe 8, it can scrape the inner wall of the exchange pipe 8. A fluid channel 9251 is inclinedly opened on the sliding ring 925 in the direction opposite to that of the diversion channel 9211.

[0064] It should be noted that by providing the diversion channel 9211, in a set of turbulent flow cleaning mechanism 9, the magnetic moving part 92 is moved to the magnetic fixed part 91 of another set of turbulent flow cleaning mechanism 9 under the action of water flow and magnetic force (at this time, refer to Figure 8 the content). At this time, the liquid water acts on the axial flow fan blade 916 through the diversion channel 9211 for turbulent flow.

[0065] A scraping ring 926 is installed on the side of the moving magnetic ring 922. The inner hole diameter value of the scraping ring 926 is the same as the outer diameter of the connecting ring 914, and the width values of the scraping ring 926 and the connecting ring 914 are the same. At this time in Figure 8 this state, the scraping ring 926 is sleeved on the outer periphery of the connecting ring 914. The scraping ring 926 plays a role in scraping the inner wall of the exchange tube 8 while restricting the moving range of the blocking block 924.

[0066] Referring to Figure 2 and Figure 3 the content, inside the box body 2, between adjacent exchange tubes 8, they are separated by a partition plate 10.

[0067] It should be noted that the partition plate 10 between adjacent exchange tubes 8 inside the box body 2 can separate the phase change materials in different exchange tubes 8, avoid mutual interference, make the flow of the liquid in each exchange tube 8 more stable, and improve the efficiency and uniformity of heat exchange.

[0068] Referring to Figures 1 to 3 the content, a valve 11 is provided on the liquid inlet pipe 101, a valve 12 is provided on the liquid discharge pipe 102, and electromagnetic valves 13 are provided on both the auxiliary connection pipe 6 and the communication pipe 5.

[0069] It should be noted that when storing cold for the phase change material, the electromagnetic valve 13 is in the open state, so that the liquid water is shunted through the liquid inlet pipe 101 and enters the inside of the liquid inlet box 3, and finally flows into the liquid discharge pipe 102 through the auxiliary connection pipe 6 and is discharged.

[0070] The outside of the box body 2 is wrapped with a heat insulation layer (not shown in the figure). The heat insulation layer wrapped outside the box body 2 can reduce the heat exchange between the phase change material inside the box body 2 and the external environment, reduce the cold loss, improve the cold storage efficiency, enable the cold storage cabinet to store cold more effectively, and provide a stable cold source for subsequent use.

[0071] A temperature sensor (not shown in the figure) is provided inside the box body 2. The temperature sensor inside the box body 2 is used to monitor the temperature of the phase change material inside the box body 2 in real time. Through the temperature data fed back by the temperature sensor, the state of the phase change material can be judged.

[0072] Working principle:

[0073] During the cold storage stage of the phase change material, valve 11, valve 12 and solenoid valve 13 are opened. A part of the liquid water enters the fan coil unit 1 through the liquid inlet pipe 101, and a part is shunted through the connecting pipe 5 and flows into the liquid inlet box 3. The liquid inlet box 3 shunts the liquid water and exchanges heat with the phase change material through the exchange pipe 8. As the liquid water enters the inside of the exchange pipe 8, since the plugging block 924 is inserted into the through port in the initial state, with the flow of the liquid water and the magnetic force, the plugging block 924 is continuously pushed away from the magnetic fixing part 91 on the water-facing side and moves continuously towards the magnetic fixing part 91 on the flowing side. The liquid water passes through the annular area formed by the plugging block 924 and the exchange pipe 8, so that the liquid water area is distributed in the annular area to increase the heat exchange effect. The liquid water acts on the axial flow fan blade 916 through the diversion channel 9211 to play a role in disturbing the flow and increasing the uniformity of the liquid water temperature. When the temperature value of the phase change material reaches the preset value, valve 11 and valve 12 are closed. At this time, due to the lack of continuous liquid supply inside the exchange pipe 8, the fixed magnetic ring 912 on one side of the plugging block 924 acts on the moving magnetic ring 922 to move back (refer to Figure 8 ). The fixed magnetic ring 913 on the other side of the plugging block 924 (the fixed magnetic ring 913 here is: the fixed magnetic ring 913 at the other set of magnetic fixing parts 91 on the water-facing side of the plugging block 924) attracts the moving magnetic ring 922. At this time, the slip ring 925 and the moving block 921 can scrape the inner wall of the exchange pipe 8 when moving back to play a cleaning role, which is beneficial for reuse.

[0074] When only cooling the fan coil unit 1 through the phase change material, valve 11 and valve 12 are closed at this time, the circulation pump 7 and the solenoid valve 13 are started. The circulation pump 7 extracts the liquid water inside the liquid discharge box 4 through the auxiliary connecting pipe 6, sends the liquid water into the liquid discharge pipe 102, enters the fan coil unit 1, the liquid water flows out from the liquid inlet pipe 101, passes through the connecting pipe 5 and enters the inside of the liquid inlet box 3, then enters the exchange pipe 8 to exchange heat with the phase change material, and is discharged from the liquid discharge box 4 and enters the fan coil unit 1 again for circulation to play a role in refrigeration use.

[0075] The embodiments of the present invention have been described above, but these embodiments are not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A phase change cold storage cabinet for the terminal of a central air conditioner, including a fan coil unit (1), characterized in that: The fan coil unit (1) has a liquid inlet pipe (101) and a liquid discharge pipe (102); A box body (2) is provided on the fan coil unit (1). On one side inside the box body (2), a liquid inlet box (3) is installed, and on the other side, a liquid discharge box (4) is installed. The liquid inlet box (3) is communicated with the liquid inlet pipe (101) through a communication pipe (5), and the liquid discharge box (4) is communicated with the liquid discharge pipe (102) through an auxiliary communication pipe (6) and a circulation pump (7); A phase change material is provided inside the box body (2). The liquid inlet box (3) and the liquid discharge box (4) are communicated through a plurality of exchange pipes (8) to realize the flow of liquid and heat exchange. A plurality of flow disturbance cleaning mechanisms (9) are provided inside the exchange pipes (8); The flow disturbance cleaning mechanism (9) includes a magnetic fixed part (91) and a magnetic moving part (92) that generate a magnetic field and act on the flowing water body. The magnetic moving part (92) has a first position state and a second position state. In the first position state, the magnetic moving part (92) changes the distance from the magnetic fixed part (91) and causes flow disturbance. In the second position state, the magnetic moving part (92) moves towards the magnetic fixed part (91) and cleans the exchange pipe (8); The magnetic fixed part (91) includes a mounting ring (911), a first fixed magnetic ring (912) and a second fixed magnetic ring (913). The mounting ring (911) is fixedly sleeved inside the exchange pipe (8). The first fixed magnetic ring (912) and the second fixed magnetic ring (913) are respectively installed on both sides of the mounting ring (911). A communicating through-port is formed in the middle of the mounting ring (911), the first fixed magnetic ring (912) and the second fixed magnetic ring (913), and the diameter of the through-port gradually increases from the first fixed magnetic ring (912) towards the second fixed magnetic ring (913); The magnetic moving part (92) includes a moving block (921), a first moving magnetic ring (922), a second moving magnetic ring (923) and a blocking block (924). The moving block (921) is slidably sleeved inside the exchange pipe (8) and is provided with an inclined diversion channel (9211). The first moving magnetic ring (922) and the second moving magnetic ring (923) are respectively embedded on both sides of the moving block (921). The first moving magnetic ring (922) has the same magnetic property as the first fixed magnetic ring (912), and the second moving magnetic ring (923) has the opposite magnetic property to the second fixed magnetic ring (913). The blocking block (924) is installed on one side of the moving block (921). One side of the blocking block (924) is adapted to the through-port, and the other side is round; 2. The central air-conditioning terminal phase change cold storage cabinet according to claim 1, characterized in that: A connecting ring (914) is installed on the side of the first fixed magnetic ring (912) away from the mounting ring (911). An axial flow fan blade (916) is rotatably connected inside the connecting ring (914) through a rotating ring (915); 3. A phase change cold storage cabinet for the terminal of a central air conditioner according to claim 2, characterized in that: A sliding ring (925) is fixedly sleeved on the outer periphery of the blocking block (924). A fluid channel (9251) inclined in the direction opposite to the diversion channel (9211) is formed on the sliding ring (925).

4. A phase change cold storage cabinet for the terminal of a central air conditioner according to claim 3, characterized in that: A scraping ring (926) is installed on the side of the moving magnetic ring one (922). The inner hole diameter value of the scraping ring (926) is the same as the outer diameter of the connecting ring (914), and the width values of the scraping ring (926) and the connecting ring (914) are the same.

5. A phase change cold storage cabinet for the terminal of a central air conditioner according to claim 4, characterized in that: Inside the box body (2), between adjacent exchange pipes (8), it is separated by a partition plate (10).

6. The central air-conditioning terminal phase change cold storage cabinet according to claim 5, wherein: A valve one (11) is provided on the liquid inlet pipe (101), a valve two (12) is provided on the liquid discharge pipe (102), and electromagnetic valves (13) are provided on both the auxiliary communication pipe (6) and the communication pipe (5).

7. A phase change cold storage cabinet for the terminal of a central air conditioner according to claim 6, characterized in that: The outside of the box body (2) is wrapped with a heat insulation layer.

8. A phase change cold storage cabinet for the terminal of a central air conditioner according to claim 7, characterized in that: A temperature sensor is provided inside the box body (2).

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