A heat pump drainage defrosting heating system

Abstract

The utility model relates to heat pump drainage defrosting technical field, concretely relates to a kind of heat pump drainage defrosting heating system, comprising: compression system, condenser, evaporator and heating system;Wherein, the heating system is arranged between condenser and evaporator, for heating evaporator drainage system;The beneficial effects of the utility model are that: the application is integrated between condenser and evaporator by heating system, the heat in heat pump circulation is used to actively heat drainage system, effectively avoid the ice block and overflow problem caused by drainage icing under low temperature environment, with the technical effect of improving equipment safety and operating stability.

Description

Technical Field

[0001] This utility model relates to the field of heat pump drainage defrosting technology, specifically to a heat pump drainage defrosting heating system. Background Technology

[0002] Currently, heat pump air coolers are widely used in various heating and cooling systems. Due to the low internal temperature of cold storage facilities, frost easily forms on the surface of the indoor unit's evaporator during operation in low-temperature, high-humidity environments, leading to a decline in system performance. Therefore, regular defrosting is necessary. Existing heat pump systems mostly employ reverse-cycle defrosting, but in actual operation, the following prominent problems still exist: Short and unstable defrosting time: Traditional defrosting control strategies rely heavily on time or temperature difference, making it difficult to accurately match the actual frosting conditions. This results in frequent defrosting starts and defrosting processes that are either too short or too long. Incomplete defrosting in a short time can cause residual water on the evaporator surface and in the drip tray to refreeze. As the ice layer gradually accumulates, it eventually blocks the drain channels.

[0003] Severe icing in the drainage system: During defrosting, if the melted frost water is not drained in time, it will freeze in the drip tray and drain pipe at the bottom of the evaporator, causing poor drainage. In severe cases, ice blockage can cause the drip tray to overflow, the unit to freeze more rapidly, and even damage the fan and heat exchanger structure, affecting the safe and stable operation of the system.

[0004] Increased system complexity and cost: To address the problem of drainage freezing, some existing solutions attempt to add electric heating belts or independent drainage heating devices. While these methods have some effect, they increase system energy consumption, control complexity, and manufacturing costs, while also reducing the overall energy efficiency and reliability of the system.

[0005] Therefore, a heat pump drainage defrosting heating system is needed to overcome the above problems. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides a heat pump drainage defrosting and heating system, which achieves the goal of solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model embodiment adopts the following technical solution: a heat pump drainage defrosting heating system, comprising: a compression system, a condenser, an evaporator, and a heating system; wherein, the heating system is disposed between the condenser and the evaporator and is used to heat the evaporator drainage system.

[0008] As a further improvement to the above technical solution: The heating system includes: a system pipeline connected between the condenser and the evaporator, with one end located at the evaporator drainage system; and an electronic expansion valve located at the connection points between the system pipeline and the condenser, and between the system pipeline and the evaporator.

[0009] The compression system includes: a compressor, a gas-liquid separator located at the compressor inlet, an oil separator located at the compressor outlet, and a four-way valve located at the connection point between the compression system, the condenser, and the evaporator.

[0010] During refrigeration, the outlet of the compression system is connected to the condenser through a four-way valve; during defrosting, the outlet of the compression system is connected to the evaporator through a four-way valve.

[0011] The beneficial effects of this utility model embodiment are as follows: This application integrates the heating system between the condenser and the evaporator, and uses pipeline flow control to effectively utilize the heat in the heat pump cycle to actively heat the drainage system. This effectively avoids ice blockage and overflow problems caused by drainage freezing in low-temperature environments, and has the technical effect of improving equipment safety and operational stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the flow direction during refrigeration according to this utility model; Figure 2 This is a schematic diagram of the flow direction during defrosting according to this utility model; Figure 3 The flow direction of the refrigeration process in this utility model (thermal expansion valve + check valve); Figure 4 The flow direction of the heating process in this utility model (thermal expansion valve + check valve).

[0013] In the diagram: 1. Compression system; 2. Condenser; 3. Evaporator; 4. Heating system; 11. Compressor; 12. Gas-liquid separator; 13. Oil separator; 14. Four-way valve; 41. System piping; 42. Electronic expansion valve; 5. Thermal expansion valve; 6. Check valve. Detailed Implementation

[0014] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0015] See Figures 1 to 2 This utility model discloses a heat pump drainage defrosting heating system, including: a compression system 1, a condenser 2, an evaporator 3, and a heating system 4; wherein, the heating system 4 is disposed between the condenser 2 and the evaporator 3, and is used to heat the drainage system of the evaporator 3.

[0016] By integrating the heating system 4 into the critical path of the heat pump cycle, the system's internal energy is directly and continuously applied to the drainage system via superheat transfer, thus avoiding the additional energy consumption issues associated with relying on external electric heating devices in traditional solutions. Specifically, the heating system 4 is located between the condenser 2 and the evaporator 3. It uses system heat to melt frost in the drainage system in real time by changing the system's flow path and employing throttling methods, ensuring smooth drainage. This design not only solves the problem of poor drainage caused by evaporator drainage system icing in low-temperature and high-humidity environments, but also avoids potential risks such as overflowing of the drip tray and accelerated icing of the unit due to drainage icing.

[0017] This application further proposes a heating system 4 including: a system pipeline 41, connected between the condenser 2 and the evaporator 3, one end of which is located at the bottom of the evaporator 3 and at the point where the drainage system needs to be heated; and an electronic expansion valve 42, located at the connection between the system pipeline 41 and the condenser 2 and at the connection between the system pipeline 41 and the evaporator 3. The two sets of electronic expansion valves 42, through normal opening or throttling switching under specific operating conditions, realize the role interchange between the evaporator (3) and the condenser (2), so as to achieve the constant (41) defrosting heat release facility under both refrigeration and defrosting heating conditions, thereby realizing the continuous drainage process under multiple operating conditions.

[0018] System piping 41 is a key component used to transport medium-temperature fluid to provide heat energy. It enters the bottom of the evaporator 3 in a non-sequential manner to prevent icing at the bottom of the evaporator, and then enters the drainage system to prevent icing of the drain water. The electronic expansion valve 42 can be understood as a throttling regulating device that can both allow direct flow and precisely control the fluid flow rate. The purpose of introducing the electronic expansion valve 42 is to achieve corresponding direct-flow normal opening or throttling regulation switching during the defrosting heating or cooling process according to the system operating conditions. This ensures that the system switches between direct flow without throttling and throttling regulation according to predetermined operating conditions. The electronic expansion valve 42 reduces the need for thermal expansion valves and check valves, lowering costs and increasing stability.

[0019] This solution establishes a complete heating and control mechanism for the drainage system by organically combining system piping 41 with electronic expansion valve 42. One end of system piping 41 extends to the bottom of evaporator 3 and the drainage system, allowing the medium-temperature fluid to directly and continuously act on the easily icing area, making full use of the heat generated by the heat pump system itself. This solves the drainage heating problem and improves the subcooling of the medium-temperature throttling liquid, thereby increasing efficiency and avoiding additional energy consumption.

[0020] This application further proposes the following technical solution: the compression system 1 includes a compressor 11, a gas-liquid separator 12 is disposed at the air inlet of the compressor 11, an oil separator 13 is disposed at the air outlet of the compressor 11, and a four-way valve 14 is disposed at the connection between the compression system 1, the condenser 2 and the evaporator 3.

[0021] The gas-liquid separator 12 is a device used to separate gaseous and liquid components in refrigerant. It can be implemented using a cyclone separation structure, a filter screen separation structure, or a gravity settling separation structure. Its purpose is to intercept backflowing liquid refrigerant and prevent it from directly entering the compressor 11 and causing liquid slugging. The oil separator 13 can be understood as a device that uses airflow characteristics to separate lubricating oil. It can be implemented through centrifugal separation, filtration separation, or adsorption separation. Its purpose is to promptly separate and recover lubricating oil, ensuring the lubrication performance of the compressor 11. The four-way valve 14 is a control device that can switch the direction of refrigerant flow. It can be implemented through electromagnetic or mechanical drive, and its purpose is to precisely control the flow path of the refrigerant to meet the needs of different operating modes.

[0022] This application further proposes the following technical solution: during refrigeration operation, the outlet of the compression system 1 is connected to the condenser 2 through the four-way valve 14; during defrosting operation, the outlet of the compression system 1 is connected to the evaporator 3 through the four-way valve 14.

[0023] During refrigeration, the outlet of the compression system 1 directs high-temperature, high-pressure gas to the condenser 2 via a four-way valve 14, allowing the gas to dissipate heat and condense in the condenser 2, thus maintaining the refrigeration cycle. During defrosting, the outlet of the compression system 1 directs high-temperature, high-pressure gas to the evaporator 3 via the four-way valve 14, utilizing the heat released from gas condensation to perform reverse-cycle defrosting on the surface of the evaporator 3.

[0024] As a description of the work in this application: During refrigeration operation, the high-temperature and high-pressure gas at the outlet of the compression system 1 is directed to the condenser 2 through the four-way valve 14. The medium-temperature liquid refrigerant, after being condensed by the heat dissipation of the condenser 2, flows directly into the system pipeline 41 through the electronic expansion valve 42. The refrigerant's own heat heats and defrosts the bottom of the evaporator 3, the water tray, and the drain pipe. Subsequently, the refrigerant absorbs heat through the evaporator 3 and flows back to the compression system 1. During defrosting, the high-temperature, high-pressure gas from the outlet of the compression system 1 is directed to the evaporator 3 via the four-way valve 14. The heat from the high-temperature, high-pressure gas is used to heat or defrost the evaporator 3. The medium-temperature liquid refrigerant, after releasing heat, flows directly into the drainage system of the evaporator 3 through the electronic expansion valve 42 at the evaporator 3 for heating. Then, the refrigerant flows through the system pipeline 41 and through the electronic expansion valve 42 at the condenser 2, and then enters the condenser 2 to evaporate and absorb heat. Afterward, the refrigerant enters the four-way valve 14 and then flows back to the compression system 1.

[0025] This application further proposes the following technical solution: In the above cycle process, the electronic expansion valve can be replaced by a thermal expansion valve and a check valve; using two sets of thermal expansion valves 5 and check valves 6, the flow direction is automatically switched according to the system operating conditions. For example... Figure 3 The diagram shows the flow direction of the refrigeration process, as follows: Figure 4 The diagram shows the flow direction during the heating process.

[0026] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0029] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A heat pump drainage defrosting and heating system, characterized in that, include: Compression system (1), condenser (2), evaporator (3) and heating system (4); The heating system (4) is located between the condenser (2) and the evaporator (3) and is used to heat the drainage system of the evaporator (3).

2. The heat pump drainage defrosting heating system according to claim 1, characterized in that, The heating system (4) includes: The system piping (41) connects the condenser (2) and the evaporator (3), with one end located at the evaporator (3) drainage system. An electronic expansion valve (42) is installed at the connection between the system pipeline (41) and the condenser (2) and at the connection between the system pipeline (41) and the evaporator (3).

3. The heat pump drainage defrosting heating system according to claim 1, characterized in that, The compression system (1) includes: Compressor (11) The gas-liquid separator (12) is located at the air inlet of the compressor (11). An oil separator (13) is installed at the outlet of the compressor (11), and A four-way valve (14) is installed at the connection point of the compression system (1), the condenser (2) and the evaporator (3).

4. The heat pump drainage defrosting heating system according to claim 3, characterized in that, During refrigeration, the outlet of the compression system (1) is connected to the condenser (2) through the four-way valve (14). During defrosting, the outlet of the compression system (1) is connected to the evaporator (3) through the four-way valve (14).

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