Refrigeration system for multi-evaporator hot gas defrosting

Abstract

The application relates to the field of refrigeration technology, and particularly relates to a refrigeration system for hot fluorine defrosting of multiple evaporators. The refrigeration system for hot fluorine defrosting of multiple evaporators comprises a compressor, a condenser, multiple evaporators, a gas return pipeline, a hot fluorine pipeline, a liquid discharge pipeline, a liquid supply pipeline and a liquid collecting pipeline, and the refrigeration system for hot fluorine defrosting of multiple evaporators has a refrigeration state and a defrosting state. One end of the liquid collecting pipeline is communicated with the other end of the liquid supply pipeline and the other end of the liquid discharge pipeline, the other end of the liquid collecting pipeline is communicated with each first liquid discharge port, and the liquid collecting pipeline is located below each first liquid discharge port in the height direction. By communicating each first liquid discharge port with the liquid collecting pipeline and always locating the liquid collecting pipeline below each first liquid discharge port, the multiple evaporators can simultaneously defrost when the refrigeration system is in the defrosting state, and accumulation of liquid refrigerant at the first liquid discharge port of the evaporator can be avoided, so that the normal work of the evaporator and the defrosting effect are not affected.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a refrigeration system for multi-evaporator hot refrigerant defrosting. Background Technology

[0002] In refrigeration systems, defrosting and de-icing of evaporators are mostly solved using hot-fluid defrosting technology. This technology uses heat from the refrigerant to accelerate the melting of frost and ice, maintaining efficient equipment operation. Typically, each evaporator is equipped with a separate hot-fluid defrosting control valve assembly. This configuration not only increases equipment investment costs but also makes the control of the entire system exceptionally complex.

[0003] However, when using a single hot refrigerant defrosting pipeline to control multiple evaporators for simultaneous defrosting, the different pipeline structures connecting each evaporator to the hot refrigerant defrosting pipeline result in differences in internal resistance. These differences in internal resistance make it difficult to maintain consistent refrigerant drainage across the evaporators, leading to uneven refrigerant distribution. Consequently, some evaporators may not receive enough hot air for defrosting, making it difficult to achieve simultaneous defrosting of multiple evaporators. Utility Model Content

[0004] This application discloses a refrigeration system for hot refrigerant defrosting of multiple evaporators, which can achieve simultaneous defrosting of multiple evaporators with good defrosting effect, and can also reduce the control difficulty of the refrigeration system and the investment cost of refrigeration equipment.

[0005] To achieve the above objectives, in a first aspect, this application discloses a refrigeration system for multi-evaporator hot refrigerant defrosting, comprising:

[0006] compressor;

[0007] Condenser;

[0008] Multiple evaporators, each evaporator having a first liquid drain port and a first gas port;

[0009] A return gas line, wherein the return gas line is connected to the compressor and the first gas port;

[0010] A hot-fluid pipeline, wherein the hot-fluid pipeline is connected to the compressor and the first gas port;

[0011] A liquid supply line, one end of which is connected to the condenser;

[0012] A drain pipe, one end of which is connected to the condenser;

[0013] A liquid collection pipeline, one end of which is connected to the other end of the liquid supply pipeline and the other end of the liquid discharge pipeline, and the other end of which is connected to each of the first liquid discharge ports, and the liquid collection pipeline is located below each of the first liquid discharge ports along the height direction;

[0014] The refrigeration system for multi-evaporator hot refrigerant defrosting has a refrigeration state and a defrosting state;

[0015] In the refrigeration state, the liquid refrigerant output from the condenser is sequentially transported to the evaporator through the liquid supply line, the liquid collection line and the first liquid outlet to obtain gaseous refrigerant. The return gas line is used to return the gaseous refrigerant discharged through the first gas outlet to the compressor.

[0016] During the defrosting state, the gaseous refrigerant output by the compressor is sequentially transported to the evaporator through the hot refrigerant pipeline and the first gas port to obtain liquid refrigerant. The liquid collection pipeline is used to collect the liquid refrigerant discharged through the first drain port and transport it to the drain pipeline to flow back to the condenser.

[0017] In some possible implementations, the return gas pipeline is equipped with a return gas shut-off valve and an electric ball valve.

[0018] In some possible implementations, the return gas shut-off valve comprises multiple valves, which are disposed on both sides of the electric ball valve along the gas flow direction of the return gas pipeline.

[0019] In some possible implementations, the liquid supply pipeline is provided with a liquid supply shut-off valve, a first filter, a first solenoid valve, a first check valve, and a regulating valve in sequence along the flow direction of the liquid refrigerant.

[0020] In some possible implementations, the drain line is provided with a first shut-off valve, a second filter, a second check valve, and a second shut-off valve in sequence along the flow direction of the liquid refrigerant.

[0021] In some possible implementations, along the gas flow direction of the hot-fluid pipeline, the hot-fluid pipeline is sequentially provided with a third shut-off valve, a third filter, a second solenoid valve, and a fourth shut-off valve.

[0022] In some possible implementations, the evaporator includes:

[0023] Evaporator body;

[0024] A water pan pipe is attached to the evaporator body. The water pan pipe has a first gas port and a second gas port. The first gas port is connected to the second gas port. The first gas port is connected to the hot refrigerant pipe, and the second gas port is connected to the return gas pipe.

[0025] In some possible implementations, the second air inlet is located above the first air inlet along the height direction of the evaporator body.

[0026] In some possible implementations, the refrigeration system for multi-evaporator hot refrigerant defrosting further includes a three-way valve, the three-way valve having a first opening, a second opening, and a third opening, the first opening being connected to the liquid supply line, the second opening being connected to the liquid drain line, and the third opening being connected to the other end of the liquid collection line.

[0027] In some possible implementations, the liquid collection pipeline includes a main pipeline and multiple branch pipelines, one end of each of the multiple branch pipelines is connected to a corresponding number of the first drain ports, and the other end of each of the multiple branch pipelines is connected to the main pipeline, which is connected to the third opening.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The refrigeration system for multi-evaporator hot refrigerant defrosting disclosed in this application connects one end of a liquid collection pipe to the other end of a liquid supply pipe and the other end of a liquid drain pipe. The other end of the liquid collection pipe is connected to each of the first liquid drain ports, and the liquid collection pipe is located below each of the first liquid drain ports along the vertical direction. Thus, in the refrigeration state, the liquid refrigerant output from the condenser is sequentially transported to the evaporator through the liquid supply pipe, the liquid collection pipe, and the first liquid drain ports to cool the evaporator and obtain gaseous refrigerant. The return gas pipe is used to return the gaseous refrigerant discharged through the first gas port to the compressor. In the defrosting state, the gaseous refrigerant output from the compressor is sequentially transported to the evaporator through the hot refrigerant pipe and the first gas port to heat the evaporator and obtain liquid refrigerant. The liquid collection pipe is used to collect the liquid refrigerant discharged through the first liquid drain ports and transport it to the liquid drain pipe for return to the condenser.

[0030] As can be seen, this application utilizes a liquid collection pipeline connecting each of the first liquid drain ports, and the liquid collection pipeline is always located below each of the first liquid drain ports. This allows multiple evaporators to defrost simultaneously when the refrigeration system used for multi-evaporator hot refrigerant defrosting is in defrosting mode. This ensures that the liquid refrigerant discharged from the first liquid drain ports is smoothly collected into the liquid collection pipeline, preventing liquid refrigerant from accumulating at the first liquid drain ports of the evaporators, which would affect the normal operation of the evaporators and the defrosting effect. Simultaneously, the design of the liquid collection pipeline simplifies the structure of the refrigeration system, avoids resistance differences between the evaporators and the delivery pipeline, and ensures that each evaporator receives sufficient hot air for defrosting, improving defrosting efficiency and the stability of the refrigeration system. Furthermore, controlling multiple evaporators to defrost simultaneously through a single delivery pipeline reduces the control difficulty of the refrigeration system and the investment cost of the refrigeration equipment, improving the overall economy and practicality. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is one of the structural schematic diagrams of a refrigeration system for multi-evaporator hot refrigerant defrosting in related technologies;

[0033] Figure 2 This is the second schematic diagram of a refrigeration system for multi-evaporator hot refrigerant defrosting in related technologies;

[0034] Figure 3 This is a schematic diagram of the structure of a refrigeration system for multi-evaporator hot refrigerant defrosting according to an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Refrigeration systems for multi-evaporator hot refrigerant defrosting;

[0037] 10. Compressor; 20. Condenser;

[0038] 30. Evaporator; 30a. First drain port; 301. Evaporator body; 302. Water pan piping; 302a. First gas port; 302b. Second gas port;

[0039] 40. Return gas pipeline; 401. Return gas shut-off valve; 402. Electric ball valve;

[0040] 50. Hot-fluid pipeline; 501. Third shut-off valve; 502. Third filter; 503. Second solenoid valve; 504. Fourth shut-off valve;

[0041] 60. Liquid supply pipeline; 601. Liquid supply shut-off valve; 602. First filter; 603. First solenoid valve; 604. First check valve; 605. Regulating valve;

[0042] 70. Drainage pipeline; 701. First shut-off valve; 702. Second filter; 703. Second check valve; 704. Second shut-off valve;

[0043] 80. Liquid collection pipeline; 801. Main pipeline; 802. Branch pipeline. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] In this application, the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0046] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0047] Furthermore, the terms "installation," "setup," "equipped with," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0049] In the operation and maintenance of refrigeration systems, the defrosting and de-icing of the evaporator has always been a key aspect of ensuring the efficient and stable operation of the equipment. Currently, hot-fluid defrosting technology, with its unique advantage of utilizing the heat carried by the refrigerant itself to accelerate the melting of frost and ice, has become the mainstream solution to this problem. Hot-fluid defrosting technology introduces high-temperature gaseous refrigerant onto the surface of the evaporator, causing the frost layer to melt and fall off rapidly during the heat exchange process, thereby maintaining heat exchange efficiency.

[0050] However, in related technologies, such as Figure 1 As shown, the industry standard is to equip each evaporator with a separate, complete hot gas defrosting pipeline. While this design enables precise control, it significantly increases the investment cost of the refrigeration system because it requires the purchase of multiple control valve assemblies and pipelines, as well as the provision of installation space and maintenance access for each pipeline. Furthermore, as the number of evaporators increases, the control logic of the entire refrigeration system becomes increasingly complex, making coordinated control between different hot gas defrosting pipelines more difficult, and increasing the number of potential failure points, thus increasing the difficulty of operation and maintenance.

[0051] To solve the above problems, the inventors improved the structure of the refrigeration system, such as... Figure 2 As shown, specifically, multiple evaporators are simultaneously controlled for defrosting via a single hot-air defrosting pipeline. While this method significantly reduces hardware costs and simplifies system architecture, the different piping structures connecting each evaporator to the hot-air defrosting pipeline result in varying resistance within the piping. This resistance difference makes it difficult to maintain consistent refrigerant drainage across the evaporators, leading to uneven refrigerant distribution. Consequently, some evaporators may not receive sufficient hot air for defrosting, making simultaneous defrosting of multiple evaporators difficult.

[0052] In view of this, this application provides a refrigeration system for multi-evaporator hot refrigerant defrosting, which can achieve simultaneous defrosting of multiple evaporators with good defrosting effect, and can also reduce the control difficulty of the refrigeration system and the investment cost of refrigeration equipment.

[0053] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0054] Please see Figure 3 , Figure 3This is a schematic diagram of a refrigeration system for multi-evaporator hot refrigerant defrosting according to an embodiment of this application. The arrows in the diagram indicate the flow direction of the refrigerant. This application discloses a refrigeration system 100 for multi-evaporator hot refrigerant defrosting, hereinafter referred to as "refrigeration system 100". The refrigeration system 100 includes a compressor 10, a condenser 20, and multiple evaporators 30. Each evaporator 30 has a first liquid outlet 30a and a first gas outlet 302a. The compressor 10 is used to compress the gaseous refrigerant, increasing its pressure and temperature. The condenser 20 is used to cool and condense the gaseous refrigerant output from the compressor 10 into liquid refrigerant. The refrigeration system 100 has a refrigeration state and a defrosting state. In the refrigeration state, the liquid refrigerant output from the condenser 20 is delivered to the evaporators 30 to cool the evaporators 30 and obtain gaseous refrigerant, which then flows back to the compressor 10 to achieve a refrigeration cycle. During defrosting, the gaseous refrigerant output by the compressor 10 is delivered to the evaporator 30 to heat the evaporator 30 and obtain liquid refrigerant, which is collected and returned to the condenser 20 to realize the defrosting process of the evaporator 30.

[0055] The refrigeration state refers to the evaporator 30 in the refrigeration system 100 cooling the surrounding environment, where liquid refrigerant evaporates and absorbs heat, thus achieving a cooling effect. The defrosting state refers to the state where excessive frost has formed on the surface of the evaporator 30 in the refrigeration system 100, requiring the refrigeration operation to be stopped and defrosting performed.

[0056] In some embodiments, the refrigeration system 100 includes a return gas line 40 and a liquid supply line 60. The return gas line 40 connects the compressor 10 and the evaporator 30. One end of the liquid supply line 60 is connected to the condenser 20, and the other end of the liquid supply line 60 is connected to the evaporator 30. In the refrigeration state, the liquid refrigerant output from the condenser 20 is transported to the evaporator 30 through the liquid supply line 60 to cool the evaporator 30 and obtain gaseous refrigerant. The gaseous refrigerant flows back to the compressor 10 through the return gas line 40 to realize the refrigeration process of the evaporator 30.

[0057] In some embodiments, the refrigeration system 100 includes a hot refrigerant line 50 and a drain line 70. The hot refrigerant line 50 connects the compressor 10 and the evaporator 30. One end of the drain line 70 is connected to the condenser 20, and the other end of the drain line 70 is connected to the evaporator 30. During defrosting, the gaseous refrigerant output from the compressor 10 is delivered to the evaporator 30 via the hot refrigerant line 50 to heat the evaporator 30 and obtain liquid refrigerant. This liquid refrigerant is collected by the drain line 70 and flows back to the condenser 20 to achieve the defrosting process of the evaporator 30.

[0058] In some embodiments, each evaporator 30 is provided with a first liquid drain port 30a and a first gas port 302a. The first liquid drain port 30a is used to receive and discharge liquid refrigerant in cooling and defrosting states, respectively, while the first gas port 302a is used to discharge and receive gaseous refrigerant in cooling and defrosting states, respectively. The evaporator 30 is provided with a first liquid drain port 30a to allow the inflow and outflow of liquid refrigerant, and with a first gas port 302a to allow the inflow and outflow of gaseous refrigerant.

[0059] In some embodiments, the evaporator 30 includes an evaporator body 301 and a water pan pipe 302. The water pan pipe 302 is attached to the evaporator body 301 and has a first gas port 302a and a second gas port 302b. The first gas port 302a is connected to the second gas port 302b, which is connected to the hot refrigerant line 50, and the second gas port 302b is connected to the return gas line 40. By attaching the water pan pipe 302 to the evaporator body 301, heat can be transferred to the evaporator body 301 more effectively, improving the efficiency of hot refrigerant defrosting. Simultaneously, the connection design of the first gas port 302a and the second gas port 302b ensures the smooth circulation of gaseous refrigerant in the hot refrigerant line 50 and the return gas line 40, ensuring a smooth transition between the cooling and defrosting states.

[0060] In some embodiments, along the height direction of the evaporator body 301, the second gas port 302b is located above the first gas port 302a. This design allows the hotter gaseous refrigerant to enter the water pan pipe 302 from the first gas port 302a during defrosting. Due to the physical property of hot gas rising, it can uniformly and efficiently heat the evaporator body 301, accelerating the melting of the frost layer. Secondly, during cooling, based on the physical property of cold gas sinking, the gaseous refrigerant can cool the evaporator body 301 more uniformly, improving cooling efficiency.

[0061] In some embodiments, the refrigeration system 100 includes a liquid collection line 80, one end of which is connected to the other end of the liquid supply line 60 and the other end of the liquid drain line 70, and the other end of the liquid collection line 80 is connected to each of the first liquid drain ports 30a. In the height direction, the liquid collection line 80 is located below each of the first liquid drain ports 30a.

[0062] It is understood that the height direction can be the height direction of the evaporator body 301 when it is used upright (e.g., placed on the ground).

[0063] In the refrigeration state, the liquid refrigerant output from the condenser 20 is sequentially transported to the evaporator 30 through the liquid supply line 60, the liquid collection line 80 and the first liquid discharge port 30a to cool the evaporator 30 and obtain gaseous refrigerant. The return gas line 40 is used to return the gaseous refrigerant discharged through the first gas port 302a to the compressor 10.

[0064] During defrosting, the gaseous refrigerant output by the compressor 10 is sequentially transported to the evaporator 30 through the hot refrigerant line 50 and the first gas port 302a to heat the evaporator 30 and obtain liquid refrigerant. The liquid collection line 80 is used to collect the liquid refrigerant discharged through the first liquid drain port 30a and transport it to the liquid drain line 70 to return it to the condenser 20.

[0065] As can be seen, by utilizing the liquid collection pipe 80 to connect each of the first liquid drain ports 30a, and with the liquid collection pipe 80 always located below each of the first liquid drain ports 30a, this application allows multiple evaporators 30 to defrost simultaneously when the refrigeration system 100 is in defrosting mode. This ensures that the liquid refrigerant discharged from the first liquid drain ports 30a can be smoothly collected into the liquid collection pipe 80, preventing liquid refrigerant from accumulating at the first liquid drain ports 30a of the evaporators 30, which would affect the normal operation and defrosting effect of the evaporators 30. Simultaneously, the design of the liquid collection pipe 80 simplifies the structure of the refrigeration system 100, avoids resistance differences between the evaporators 30 and the delivery pipes, ensures that each evaporator 30 receives sufficient hot air for defrosting, and improves defrosting efficiency and the stability of the refrigeration system 100. Furthermore, controlling multiple evaporators 30 to defrost simultaneously through a single delivery pipe reduces the control difficulty of the refrigeration system 100 and the investment cost of the refrigeration equipment, improving overall economy and practicality.

[0066] In some embodiments, the refrigeration system 100 further includes a three-way valve (not shown), which includes a first opening, a second opening and a third opening. The first opening is connected to the liquid supply line 60, the second opening is connected to the liquid drain line 70, and the third opening is connected to the other end of the liquid collection line 80.

[0067] The three-way valve design provides a more flexible and efficient refrigerant flow path for the refrigeration system 100. In cooling mode, the three-way valve allows liquid refrigerant to flow smoothly from the supply line 60 through the first opening into the collection line 80, and then to each evaporator 30 for cooling, ensuring the efficient operation of the refrigeration system 100. In defrosting mode, the three-way valve switches to the drain line 70, allowing liquid refrigerant discharged from the evaporator 30 to flow smoothly back to the condenser 20 through the second opening, achieving rapid defrosting of the evaporator 30. By switching the three-way valve, the refrigeration system 100 can flexibly switch between cooling and defrosting modes, improving the system's flexibility and practicality. At the same time, the three-way valve design simplifies the structure of the refrigeration system 100, reduces system complexity and maintenance costs, and improves overall economy and reliability.

[0068] In some embodiments, the liquid collection line 80 includes a main line 801 and multiple branch lines 802. One end of each branch line 802 is connected to a corresponding first drain port 30a, and the other end of each branch line 802 is connected to the main line 801, which is connected to a third opening. This design allows for more uniform and efficient flow of liquid refrigerant in the liquid collection line 80. Each evaporator 30 corresponds to one branch line 802, ensuring that the liquid refrigerant is accurately delivered to each evaporator 30 or flows evenly into the main line 801, avoiding refrigerant loss or blockage during delivery. Simultaneously, the multiple branch lines 802 converge at the main line 801 and connect to the third opening of the three-way valve, allowing the refrigeration system 100 to switch states or adjust refrigerant flow more flexibly and quickly. This liquid collection line 80 design not only improves the operating efficiency of the refrigeration system 100 but also enhances its stability and reliability, enabling the refrigeration system 100 to better adapt to different working environments and refrigeration needs.

[0069] In some embodiments, a return gas shut-off valve 401 and an electric ball valve 402 are provided on the return gas line 40. Compared with existing pneumatic two-step valves, the electric ball valve 402 provided on the return gas line 40 in this application allows for more flexible and precise control of the refrigeration system 100. The electric ball valve 402 features fast response and ease of control, enabling precise regulation of the refrigerant flow, thereby improving the operating efficiency of the refrigeration system 100. Simultaneously, the automated control of the electric ball valve 402 reduces the difficulty and complexity of manual operation, making the operation of the refrigeration system 100 more convenient. Furthermore, the return gas shut-off valve 401 ensures that the return gas line 40 can be quickly shut off when needed, ensuring the safe operation of the refrigeration system 100.

[0070] In some embodiments, multiple return gas shut-off valves 401 are provided, positioned on both sides of the electric ball valve 402 along the gas flow direction of the return gas pipeline 40. Compared to providing only one return gas shut-off valve 401, by distributing multiple return gas shut-off valves 401 on both sides of the electric ball valve 402, dual protection can be provided for the return gas pipeline 40. If one return gas shut-off valve 401 fails or leaks, the other return gas shut-off valve 401 can still function normally, preventing gas leakage and ensuring the normal operation of the refrigeration system 100. Furthermore, the return gas shut-off valves 401 on both sides of the electric ball valve 402 can achieve segmented control of the return gas pipeline 40. During maintenance or repair, only the portion of the return gas shut-off valve 401 requiring maintenance or repair can be closed, without shutting down the entire return gas pipeline 40, thereby improving the maintainability and flexibility of the refrigeration system 100.

[0071] In some embodiments, the liquid supply line 60 is sequentially equipped with a liquid supply shut-off valve 601, a first filter 602, a first solenoid valve 603, a first check valve 604, and a regulating valve 605 along the flow direction of the liquid refrigerant. It is evident that the design of the liquid supply line 60 fully considers the safety and stability of the liquid refrigerant during transportation. The liquid supply shut-off valve 601 can quickly cut off the liquid supply line 60 when necessary, preventing the liquid refrigerant from continuing to flow and ensuring operational safety. The first filter 602 effectively removes impurities from the liquid refrigerant, preventing impurities from entering the evaporator 30 and affecting the refrigeration effect or damaging the equipment. The combined use of the first solenoid valve 603 and the first check valve 604 can precisely control the flow direction and flow rate of the liquid refrigerant, ensuring the efficient operation of the refrigeration system 100. The addition of the regulating valve 605 allows the operator to adjust the flow rate of the liquid refrigerant according to actual needs, meeting different refrigeration requirements.

[0072] Meanwhile, the liquid supply shut-off valve 601, the first filter 602, the first solenoid valve 603, the first check valve 604, and the regulating valve 605 are sequentially arranged in the liquid supply pipeline 60 along the flow direction of the liquid refrigerant. This arrangement ensures that the liquid refrigerant passes through each component sequentially during transport, effectively controlling and protecting its flow state. Firstly, the liquid supply shut-off valve 601 is positioned upstream of the first filter 602, the first solenoid valve 603, the first check valve 604, and the regulating valve 605. When the liquid supply pipeline 60 stops supplying liquid, it controls the flow of the liquid refrigerant, preventing it from flowing into subsequent components. When the liquid refrigerant continues to flow, after passing through the liquid supply shut-off valve 601, it first passes through the first filter 602, which filters impurities, ensuring the purity of the subsequent liquid refrigerant and preventing impurities from affecting the first solenoid valve 603, the first check valve 604, the regulating valve 605, and the evaporator 30. Subsequently, the liquid refrigerant's flow direction is precisely controlled through the cooperation of the first solenoid valve 603 and the first one-way valve 604, preventing backflow or leakage and ensuring the normal operation of the refrigeration system 100. Finally, the flow rate of the liquid refrigerant is precisely controlled by the regulating valve 605 to meet the needs of the refrigeration system 100 under different operating conditions. This design not only improves the operating efficiency of the refrigeration system 100 but also enhances its stability and safety.

[0073] In some embodiments, the drain line 70 is sequentially equipped with a first shut-off valve 701, a second filter 702, a second check valve 703, and a second shut-off valve 704 along the flow direction of the liquid refrigerant. It is evident that the design of the drain line 70 also fully considers the safety and stability of the liquid refrigerant during transport. The first shut-off valve 701 can quickly cut off the drain line 70 when necessary, preventing the liquid refrigerant from continuing to flow and ensuring operational safety. The second filter 702 effectively removes impurities that may be generated during the defrosting process, preventing impurities from entering the condenser 20 and affecting the refrigeration effect or damaging the equipment. The second check valve 703 ensures that the liquid refrigerant flows only in one direction, avoiding backflow or leakage and ensuring the normal operation of the refrigeration system 100. The second shut-off valve 704, located at the end of the drain line 70, provides additional safety assurance when needed, ensuring that the liquid refrigerant does not leak accidentally.

[0074] Furthermore, the first shut-off valve 701, the second filter 702, the second check valve 703, and the second shut-off valve 704 are sequentially arranged in the drain pipe 70 along the flow direction of the liquid refrigerant. This arrangement ensures that the liquid refrigerant passes through each component in sequence during transport, achieving effective control and protection of its flow state. This design not only improves the operating efficiency of the refrigeration system 100 but also enhances its stability and safety, enabling the refrigeration system 100 to operate more efficiently and stably during defrosting.

[0075] In some embodiments, along the gas flow direction of the hot-fluid pipeline 50, a third shut-off valve 501, a third filter 502, a second solenoid valve 503, and a fourth shut-off valve 504 are sequentially arranged in the hot-fluid pipeline 50. It is evident that the design of the hot-fluid pipeline 50 fully considers the safety and stability of the gaseous refrigerant during transportation. The third shut-off valve 501 can quickly cut off the hot-fluid pipeline 50 when necessary, preventing the continued flow of gaseous refrigerant and ensuring operational safety. The third filter 502 effectively removes any impurities that may be present in the gaseous refrigerant, preventing impurities from entering the evaporator 30 and affecting the defrosting effect or damaging the equipment. The second solenoid valve 503 enables precise control of the gaseous refrigerant flow direction, ensuring that the gaseous refrigerant can enter the evaporator 30 for defrosting as needed. The fourth shut-off valve 504, located at the end of the hot-fluid pipeline 50, provides additional safety assurance when needed, preventing accidental leakage of gaseous refrigerant.

[0076] Furthermore, the third shut-off valve 501, the third filter 502, the second solenoid valve 503, and the fourth shut-off valve 504 are sequentially arranged in the hot-fluid pipeline 50 along the flow direction of the gaseous refrigerant. This arrangement ensures that the gaseous refrigerant passes through each component in sequence during transport, achieving effective control and protection of its flow state. This design not only improves the defrosting efficiency of the refrigeration system 100 but also enhances its stability and safety, enabling smoother and more efficient switching between defrosting and cooling states.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A refrigeration system for multi-evaporator hot gas defrosting, characterized by, include: compressor; Condenser; Multiple evaporators, each evaporator having a first gas inlet and a first liquid outlet; A return gas line, wherein the return gas line is connected to the compressor and the first gas port; A hot-fluid pipeline, wherein the hot-fluid pipeline is connected to the compressor and the first gas port; A liquid supply line, one end of which is connected to the condenser; A drain pipe, one end of which is connected to the condenser; A liquid collection pipeline, one end of which is connected to the other end of the liquid supply pipeline and the other end of the liquid discharge pipeline, and the other end of which is connected to each of the first liquid discharge ports, and the liquid collection pipeline is located below each of the first liquid discharge ports along the height direction; The refrigeration system for multi-evaporator hot refrigerant defrosting has a refrigeration state and a defrosting state; In the refrigeration state, the liquid refrigerant output from the condenser is sequentially transported to the evaporator through the liquid supply line, the liquid collection line and the first liquid outlet to obtain gaseous refrigerant. The return gas line is used to return the gaseous refrigerant discharged through the first gas outlet to the compressor. During the defrosting state, the gaseous refrigerant output by the compressor is sequentially transported to the evaporator through the hot refrigerant pipeline and the first gas port to obtain liquid refrigerant. The liquid collection pipeline is used to collect the liquid refrigerant discharged through the first drain port and transport it to the drain pipeline to flow back to the condenser.

2. A refrigeration system for multi-evaporator hot gas fluorine defrosting as claimed in claim 1 wherein, The return gas pipeline is equipped with a return gas shut-off valve and an electric ball valve.

3. A refrigeration system for multi-evaporator hot gas fluorine defrosting as claimed in claim 2 wherein, The return gas shut-off valve includes multiple valves, which are respectively located on both sides of the electric ball valve along the gas flow direction of the return gas pipeline.

4. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 1, characterized in that, The liquid supply pipeline is provided with a liquid supply shut-off valve, a first filter, a first solenoid valve, a first check valve, and a regulating valve in sequence along the flow direction of the liquid refrigerant.

5. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 1, characterized in that, The drain pipeline is provided with a first shut-off valve, a second filter, a second check valve, and a second shut-off valve in sequence along the flow direction of the liquid refrigerant.

6. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 1, characterized in that, Along the gas flow direction of the hot-fluid pipeline, the hot-fluid pipeline is sequentially equipped with a third shut-off valve, a third filter, a second solenoid valve, and a fourth shut-off valve.

7. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 1, characterized in that, The evaporator includes: Evaporator body; A water pan pipe is attached to the evaporator body. The water pan pipe has a first gas port and a second gas port. The first gas port is connected to the second gas port. The first gas port is connected to the hot refrigerant pipe, and the second gas port is connected to the return gas pipe.

8. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 7, characterized in that, Along the height direction of the evaporator body, the second air inlet is located above the first air inlet.

9. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 1, characterized in that, The refrigeration system for multi-evaporator hot refrigerant defrosting also includes a three-way valve, which has a first opening, a second opening, and a third opening. The first opening is connected to the liquid supply line, the second opening is connected to the liquid drain line, and the third opening is connected to the other end of the liquid collection line.

10. The refrigeration system for multi-evaporator hot refrigerant defrosting according to claim 9, characterized in that, The liquid collection pipeline includes a main pipeline and multiple branch pipelines. One end of each of the multiple branch pipelines is connected to one of the multiple first drain ports, and the other end of each of the multiple branch pipelines is connected to the main pipeline. The main pipeline is connected to the third opening.

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