A device for reducing the frost speed and fast defrosting of a low-temperature air source heat pump for ejecting wind

Abstract

The utility model discloses a device for reducing frost speed and quick defrosting of low temperature air source heat pump for ejection wind, including gas collector, core, distributor, gas collector is connected with the core through multichannel, and the core is connected with the distributor again, and the other end of distributor is connected with distribution main pipe, and the core is communicated with distribution main pipe through defrosting spare, and one end of defrosting spare is located in distribution main pipe, and the other end is located in the bottom of core, and the core is communicated with distribution main pipe through defrosting spare, and one end of defrosting spare is located in distribution main pipe, and the other end is located in the bottom of core, so that the directional refrigerant flow channel is formed between the core and distribution main pipe, and under the action of defrosting spare, the refrigerant flows to distribution main pipe through defrosting spare. This directional flow can enhance the refrigerant circulation efficiency of the bottom of the core, so that the bottom can more timely take away the redundant cold capacity, reduce the rapid frost caused by the accumulation of cold capacity, and at the same time, the refrigerant exchange of the upper layer of the core and the gas collector is more sufficient through multichannel connection, avoiding the uneven frost situation.

Description

Technical Field

[0001] This utility model relates to the field of air source heat pump technology, specifically to a device for reducing the frosting speed and rapidly defrosting a low-temperature air source heat pump with top-discharge air. Background Technology

[0002] When a low-temperature air source heat pump is used for heating at low temperatures, the finned heat exchanger, acting as the evaporator side, is prone to frost buildup. The frost layer not only increases the thermal resistance of heat transfer from the air to the evaporator fins but also reduces the area of ​​the airflow channel, resulting in reduced airflow and a lower evaporation temperature. This severely impacts the heating capacity of the heat pump unit and can even cause it to shut down. Therefore, timely defrosting is crucial to maintaining the heat pump's heating efficiency.

[0003] To defrost heat exchangers, many manufacturers have attempted to add a one-way valve at the bottom of traditional distributor components to block their participation in heat exchange. However, this approach has significant drawbacks: firstly, the welding process can easily cause the one-way valve to fail, or the valve's own resistance may be too high, greatly reducing its blocking effect; secondly, when the bottom U-shaped section is not involved in heat exchange, it becomes the lowest temperature point in the system, easily accumulating large amounts of liquid refrigerant and compressor lubricating oil. This accumulation directly affects the defrosting process: when this area becomes the condenser side during defrosting, the accumulated refrigerant and lubricating oil cause a sharp increase in system resistance, making it impossible to establish an effective pressure differential in a short time; even after the one-way valve is activated, it takes a considerable amount of time to heat up before exiting the defrosting state, ultimately resulting in excessively long defrosting time and severely impacting the unit's heating operation time. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for reducing the frosting speed and quickly defrosting of a low-temperature air source heat pump with top-outlet air, so as to solve the problems of slow frosting of heat exchangers and uneven frosting at the bottom and top in the existing technology.

[0005] According to an embodiment of the present invention, a device for reducing the frosting speed and quickly defrosting a low-temperature air source heat pump with top-outlet air includes an air collection pipe, a core body, and a distributor. The air collection pipe is connected to the core body through multiple pipes, and the core body is then connected to the distributor. The other end of the distributor is connected to the main distribution pipe. The core body and the main distribution pipe are connected through a defrosting component, one end of which is located on the main distribution pipe and the other end is located at the bottom of the core body.

[0006] Compared to existing technologies, this invention offers the following advantages: The core and distribution manifold are connected via a defrosting component, with one end of the component located on the distribution manifold and the other end at the bottom of the core. This creates a directional refrigerant flow channel between the core and the distribution manifold. Under the action of the defrosting component, the refrigerant flows through it to the distribution manifold. This directional flow allows the unit to avoid utilizing the lowest flow path during heating (due to the lowest flow path having the smallest airflow and extremely poor heat exchange), while maintaining normal operation during cooling. The defrosting component guides the refrigerant from the gas collecting pipe through the core to the distribution manifold. By bypassing the distribution manifold, the pressure difference between the two sides is greatly increased, allowing hot refrigerant to flow quickly and remove frost from the core rapidly without affecting normal defrosting on the upper side. Simultaneously, the high temperature prevents the water flowing down from the upper defrosting side from refreezing at the bottom of the core. By balancing the refrigerant circulation between the upper and lower layers of the heat pump unit, this design avoids the situation where the lower layer frosts up too quickly while the upper layer remains unfrosted, requiring a short defrosting cycle. Repeated short defrosting cycles lead to excessive defrosting time, impacting the overall heating performance and user experience. This defrosting component ensures more even frost formation between the upper and lower layers, effectively preventing severe frost buildup on the lower layer while the upper layer remains almost bare. With more even and slower frost formation, defrosting no longer needs to focus on areas with thick frost, allowing for rapid defrosting of the entire heat pump unit. This shortens defrosting time, improves defrosting efficiency, and ensures stable heating operation of the heat pump unit in low-temperature environments.

[0007] Preferably, the defrosting component includes a first tube and a one-way valve disposed at one end of the first tube, and a second tube disposed at the other end of the one-way valve.

[0008] Preferably, the one-way valve controls the flow of fluid from the second pipe to the first pipe.

[0009] Preferably, the first pipe is disposed on and connected to the main distribution pipe.

[0010] Preferably, the second tube is disposed at the bottom of the core and is connected thereto.

[0011] Preferably, both the first tube and the second tube are made of copper or stainless steel. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0013] Figure 2 This is a three-dimensional structural diagram of the defrosting component in an embodiment of this utility model.

[0014] Figure 3 This is a schematic diagram of the installation of the defrosting component in an embodiment of this utility model.

[0015] The reference numerals in the accompanying drawings include: 1. Gas collection pipe; 2. Distributor; 3. Core; 4. Defrosting component; 401. First pipe; 402. One-way valve; 403. Second pipe; 5. Distribution main pipe. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figures 1 to 3 As shown in the figure, this utility model embodiment proposes a device for reducing the frosting speed and quickly defrosting a low-temperature air source heat pump with top-outlet air. It includes an air collecting pipe 1, a core body 3, and a distributor 2. The air collecting pipe 1 is connected to the core body 3 through multiple pipes. The core body 3 is then connected to the distributor 2. The other end of the distributor 2 is connected to the main distribution pipe 5. The core body 3 and the main distribution pipe 5 are connected by a defrosting component 4. One end of the defrosting component 4 is located in the main distribution pipe 5, and the other end is located at the bottom of the core body 3.

[0018] The detailed working process of this embodiment is as follows: the core 3 is connected to the distribution main pipe 5 through the defrosting component 4, and one end of the defrosting component 4 is located at the distribution main pipe 5, and the other end is located at the bottom of the core 3, so that a directional refrigerant flow channel is formed between the core 3 and the distribution main pipe 5, forming a "one in, two out" distribution method. The outlet sampling point is adjusted to the distribution main pipe 5 to optimize the distribution logic of the refrigerant in the heat exchanger. Under the action of the defrosting component 4, the refrigerant flows to the distribution main pipe 5 through the defrosting component 4. This directional flow enhances the refrigerant circulation efficiency at the bottom of core 3. During heating, the refrigerant does not pass through, reducing heat exchange and causing severe frost buildup. During cooling, it does not affect the flow, ensuring unit performance. During defrosting, it quickly establishes a pressure difference, causing core 3 to heat up and defrost rapidly, and preventing water flowing down from the top of the defrost layer from refreezing at the bottom of core 3. Simultaneously, the multi-pipe connection ensures more thorough refrigerant exchange between the upper layer of core 3 and the air collecting pipe 1, directing the refrigerant upwards. This improves the situation where uneven airflow due to top-outlet characteristics leads to overheating on the upper side and insufficient heat exchange on the lower side. By balancing the refrigerant circulation state between the upper and lower layers of core 3, it avoids the situation where the lower layer frosts too quickly while the upper layer remains unfrosted, requiring short defrosting cycles. Repeated short defrosting cycles result in excessive defrosting time, affecting the overall heating performance and user experience. This defrosting component ensures more even frost formation between the upper and lower layers, effectively preventing severe frost buildup on the lower layer and almost no frost on the upper layer. Once the frost is evenly formed and the rate of defrosting slows down, there is no need to focus on areas with thick frost during defrosting. This allows for rapid defrosting of the entire core, shortens defrosting time, improves defrosting efficiency, and ensures stable heating operation of the heat pump unit in low-temperature environments.

[0019] like Figure 2 As shown, the defrosting component 4 includes a first pipe 401 and a one-way valve 402 disposed at the end of the first pipe 401, and a second pipe 403 disposed at the other end of the one-way valve 402.

[0020] The detailed working process of this embodiment is as follows: The one-way valve 402 effectively controls the flow direction of the refrigerant, ensuring that the refrigerant can only flow orderly from the core 3 through the second pipe 403, the one-way valve 402, and the first pipe 401. The function of the one-way valve 402 is to control this passage, so that it is not used during heating, but is used during defrosting and cooling, thus clearly defining its function. This directional flow allows for more rational refrigerant circulation inside the core 3, resulting in a more balanced heat distribution in all parts of the core 3.

[0021] This refrigerant flow method reduces the rapid frost formation at the bottom of core 3 due to heat imbalance, slows down the frost formation speed, and makes the frost formation speed of the upper and lower layers of core 3 more consistent, avoiding the uneven situation where the lower layer has a lot of frost while the upper layer has almost no frost, making the frost formation of the entire core 3 more uniform.

[0022] like Figure 2 As shown, the one-way valve 402 controls the flow of fluid from the second pipe 403 to the first pipe 401.

[0023] The detailed working process of this embodiment is as follows: the one-way valve 402 controls the fluid to flow from the second pipe 403 to the first pipe 401, which can strictly limit the refrigerant to flow only in this direction, effectively avoid refrigerant backflow, and ensure that the refrigerant at the bottom of the core 3 is continuously and directionally delivered to the distribution main pipe 5, preventing the accumulation of cold at the bottom of the core 3 due to backflow, thereby slowing down the frosting speed at the bottom.

[0024] like Figure 2 As shown, the first pipe 401 is installed on the main distribution pipe 5 and is connected to it.

[0025] like Figure 2 As shown, the second tube 403 is located at the bottom of the core 3 and is connected to it.

[0026] The detailed working process of this embodiment is as follows: the first pipe 401 is located in the main distribution pipe 5 and connected, and the second pipe 403 is located at the bottom of the core 3 and connected. Together with the one-way valve 402, a one-way passage is formed, so that the refrigerant is distributed more evenly in the main distribution pipe 5, and the bottom heat exchanger can effectively participate in heat exchange, avoiding the lowest temperature point due to "not participating in heat exchange", and reducing rapid frosting caused by local overcooling.

[0027] Meanwhile, the optimized refrigerant distribution reduces the impact of the airflow on heat exchange (traditional devices are greatly affected by uneven airflow), making the heat exchange efficiency of the bottom and upper heat exchangers more balanced, and the frosting speed synchronized, avoiding the imbalance of "severe frosting on the lower layer and slight frosting on the upper layer".

[0028] like Figure 1 As shown, both the first tube 401 and the second tube 403 are made of copper or stainless steel.

[0029] The detailed working process of this embodiment is as follows: Copper pipes have excellent thermal conductivity, ductility, and corrosion resistance, making them particularly suitable for transporting fluids such as refrigerants and hot water. Their smooth inner walls reduce fluid resistance and energy loss; their good ductility facilitates processing and shaping (such as bending and welding), adapting to complex pipeline layouts; simultaneously, copper pipes have low sensitivity to moisture and impurities in the refrigerant, are less prone to clogging, and can ensure long-term stable fluid transport. Stainless steel pipes possess high strength, high corrosion resistance (especially resistance to acids, alkalis, and high-temperature environments), and wear resistance, making them suitable for transporting fluids containing impurities or operating under harsh conditions (such as high humidity and corrosive gas environments). Their high rigidity allows them to withstand higher fluid pressures, reducing the risk of leakage due to pipeline deformation.

[0030] If the equipment is located in a humid or dusty environment (such as outdoor equipment), the corrosion resistance of stainless steel pipes can extend the service life of the piping and reduce maintenance costs; if lightweight and ease of installation are the priorities, the ductility and relatively light weight of copper pipes are more advantageous. Therefore, the appropriate material can be selected according to actual needs.

[0031] The implementation principle of this application's embodiments is as follows:

[0032] a. Optimization of defects in traditional units: The core problem with traditional units is that the bottom heat exchanger frosts up first due to low airflow, but the design of distributor 2 (e.g., adding a one-way valve at the bottom to block it) prevents it from participating in heat exchange, making it the lowest temperature point in the system, where liquid refrigerant and compressor lubricating oil accumulate. During defrosting, the bottom layer becomes the condenser side with high resistance, making it difficult to quickly establish a pressure difference, requiring a long heating time, resulting in excessively long defrosting time; moreover, the one-way valve is prone to welding failure or excessive resistance, exacerbating the problem (especially when the unit has a high refrigerant oil weight ratio).

[0033] The improved system adopts a "one inlet, two outlets" distribution method, adjusting the outlet sampling point to the main distribution pipe 5, and optimizing the refrigerant distribution logic within the heat exchanger.

[0034] b. Principle of Frosting Uniformity: After adjusting the sampling point position, the refrigerant distribution in the main distribution pipe 5 is more even, and the bottom heat exchanger can effectively participate in heat exchange, avoiding the lowest temperature point due to "not participating in heat exchange" and reducing rapid frosting caused by local overcooling. At the same time, the optimized refrigerant distribution weakens the impact of the air field on heat exchange (traditional devices are greatly affected by uneven air volume), making the heat exchange efficiency of the bottom and upper heat exchangers more balanced, and the frosting speed synchronized, avoiding the imbalance phenomenon of "severe frosting on the lower layer and slight frosting on the upper layer".

[0035] c. Principle of Improved Defrosting Efficiency: After the bottom heat exchanger participates in normal heat exchange, it no longer accumulates a large amount of liquid refrigerant and lubricating oil. During defrosting, the resistance on the condenser side decreases, allowing for rapid establishment of a pressure differential and shortening the heating time, thereby reducing the total defrosting time. During defrosting, the bottom temperature rises rapidly (the upper temperature remains stable), avoiding pressure fluctuations caused by excessive local temperature differences and ensuring normal unit pressure. At the same time, the bottom is in direct contact with the water collection pan, and the high temperature can quickly melt the water accumulated in the pan, preventing freezing and ensuring timely drainage of defrost water. This prevents ice from piling up and condensing back onto the heat exchanger, further improving defrosting effectiveness.

[0036] The coordination of temperature changes between the bottom and top layers of core 3 (rapid heating at the bottom and stable temperature at the top) avoids pressure surges caused by sudden changes in local resistance in traditional devices, ensuring stable unit pressure. The temperature rise effectively prevents the water accumulated on the water tray from freezing, allowing the defrosting water to drain away quickly, eliminating the chain reaction of "freezing-accumulation-affecting the heat exchanger", and ensuring long-term stable operation of the unit.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for reducing frosting speed and rapidly defrosting in a low-temperature air source heat pump with top-discharge air, comprising an air collecting pipe (1), a core (3), and a distributor (2), wherein the air collecting pipe (1) is connected to the core (3) via multiple pipes, the core (3) is then connected to the distributor (2), and the other end of the distributor (2) is connected to a main distribution pipe (5), characterized in that: The core (3) is connected to the distribution manifold (5) through a defrosting component (4), with one end of the defrosting component (4) located at the distribution manifold (5) and the other end located at the bottom of the core (3).

2. The device for reducing frosting rate and rapidly defrosting in a low-temperature air source heat pump for top-discharge air according to claim 1, characterized in that: The defrosting component (4) includes a first tube (401) and a one-way valve (402) disposed at the end of the first tube (401), and a second tube (403) is disposed at the other end of the one-way valve (402).

3. The device for reducing frosting rate and rapidly defrosting in a low-temperature air source heat pump for top-discharge air according to claim 2, characterized in that: The one-way valve (402) controls the flow of fluid from the second pipe (403) to the first pipe (401).

4. The device for reducing frosting rate and rapidly defrosting in a low-temperature air source heat pump for top-discharge air according to claim 3, characterized in that: The first pipe (401) is disposed on the main distribution pipe (5) and is connected thereto.

5. The device for reducing frosting rate and rapidly defrosting in a low-temperature air source heat pump for top-discharge air according to claim 3, characterized in that: The second tube (403) is disposed at the bottom of the core (3) and communicates with it.

6. The device for reducing frosting rate and rapidly defrosting in a low-temperature air source heat pump for top-discharge air according to claim 2, characterized in that: Both the first tube (401) and the second tube (403) are made of copper or stainless steel.

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