A defrosting and drainage device for low ambient temperature air source heat pump units

Abstract

This utility model relates to the field of heating equipment, specifically disclosing a defrosting and drainage device for a low-ambient-temperature air-source heat pump unit. The device includes a base, inside which a finned heat exchanger is installed. A stepped water collection trough is located below the finned heat exchanger within the base. The lower end of the stepped water collection trough is connected to a PTC heating tube. The inner wall of the PTC heating tube has spiral ribs. An air pump is installed on the outer wall of the base, with its outlet aligned with the water inlet of the PTC heating tube. The stepped water collection trough accelerates the flow of defrosting water, which, combined with the spiral ribs inside the PTC heating tube, forms a swirling flow. This dual physical structure reduces stagnant water retention, significantly lowering the risk of icing. Simultaneously, the self-limiting temperature characteristic of the PTC and the intermittent defrosting function of the air pump work together, activating heating only when needed, resulting in lower energy consumption compared to traditional continuous heating solutions.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment, and specifically discloses a defrosting and drainage device for low ambient temperature air source heat pump units. Background Technology

[0002] Low-ambient-temperature air-source heat pump units are heating devices capable of stable operation in extreme environments ranging from -25℃ to -30℃, achieving efficient heating by absorbing heat from the low-temperature air. These units face unique defrosting challenges when used in cold regions: when frost forms on the outdoor heat exchanger surface, the system needs to periodically defrost. If the defrost water generated during this process cannot be drained promptly, it will quickly freeze in the low-temperature environment, leading to blockage of the drainage channels.

[0003] Chinese patent CN215260667U discloses a defrosting and drainage device for low-ambient-temperature air-source heat pump units. The device includes a base, a column, a drain pipe, a drain trough, a finned heat exchanger support plate, and a heating device. The base, column, and finned heat exchanger support plate are connected sequentially from bottom to top. The drain trough is fixed below the finned heat exchanger support plate, and the drain pipe is fixedly connected to the drain outlet of the drain trough. The heating device includes an electrical control system and an electric heating element, which is installed inside the drain trough and drain pipe and extends to the end of the drain pipe. By combining a sheet metal structure with a low-energy-consumption electric heating element, the problem of finned icing in low-ambient-temperature air-source heat pumps can be solved, thus resolving the issue of finned heat exchanger icing causing the unit to malfunction during winter operation. The electrical control system activates the electric heating element based on the defrosting and drainage status, avoiding increased energy consumption when the heating element is activated without frost or drainage. The defrosting and drainage process can be completed automatically without human intervention.

[0004] The defrosting and drainage device for low ambient temperature air source heat pump units disclosed in the above document relies solely on electric heating belts to prevent ice formation in the drainage tank and drainage pipes. This method has high energy consumption and unsatisfactory defrosting effect. Therefore, a defrosting and drainage device for low ambient temperature air source heat pump units is needed to solve this problem. Utility Model Content

[0005] This utility model proposes a defrosting and drainage device for air source heat pump units in low ambient temperature environments. Through a stepped water receiving trough, a spiral ribbed vortex design, and the linkage between the PTC heating tube and the air pump, it achieves efficient antifreeze and energy-saving operation for defrosting and drainage in low-temperature environments.

[0006] This utility model is implemented as follows: a defrosting and drainage device for a low ambient temperature air source heat pump unit includes a base, a finned heat exchanger is provided inside the base, a stepped water receiving trough is provided inside the base below the finned heat exchanger, the lower end of the stepped water receiving trough is connected to a PTC heating tube, the inner wall of the PTC heating tube is provided with spiral ribs, and an air pump is installed on the outer wall of the base, with the air outlet of the air pump aligned with the water inlet of the PTC heating tube.

[0007] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, the inner wall of the base is fixedly connected to a support plate located below the finned heat exchanger, and the outer wall of the support plate is provided with a through hole.

[0008] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, the inner wall of the stepped water receiving tank is provided with a funnel that communicates with the PTC heating pipe.

[0009] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, the inner wall of the stepped water receiving tank is provided with multiple electric heating wires.

[0010] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, the inner walls of the stepped water receiving tank and the PTC heating tube are both coated with a hydrophobic layer.

[0011] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, the outer wall of the PTC heating tube is provided with a heat insulation layer.

[0012] As a preferred embodiment of the defrosting and drainage device for a low ambient temperature air source heat pump unit according to this utility model, a controller is provided on the outer wall of the base, and the finned heat exchanger, PTC heating tube, air pump and electric heating wire are all electrically connected to the controller.

[0013] The beneficial effects of this utility model are:

[0014] 1. The stepped water receiving trough accelerates the flow of defrosting water, and the spiral ribs inside the PTC heating tube form a swirling flow. The dual physical structure reduces stagnant water and significantly reduces the risk of freezing.

[0015] 2. At the same time, the PTC's self-limiting temperature characteristic works in conjunction with the intermittent de-icing of the air pump, so that heating is only started when needed, resulting in lower energy consumption compared to traditional continuous heating solutions. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is an overall structural diagram of a defrosting and drainage device for a low ambient temperature air source heat pump unit according to the present invention.

[0018] Figure 2 This is a perspective view of a defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to the present invention.

[0019] Figure 3 This is a top sectional view of the base of this utility model.

[0020] The markings in the diagram are: 1. Base; 2. Finned heat exchanger; 3. Support plate; 4. Through hole; 5. Stepped water receiving tank; 6. PTC heating tube; 7. Spiral rib; 8. Funnel; 9. Air pump; 10. Electric heating wire; 11. Controller. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0022] Please see Figure 1-3 A defrosting and drainage device for a low ambient temperature air source heat pump unit includes a base 1, a finned heat exchanger 2 is provided inside the base 1, a stepped water receiving trough 5 is provided inside the base 1 below the finned heat exchanger 2, the lower end of the stepped water receiving trough 5 is connected to a PTC heating tube 6, the inner wall of the PTC heating tube 6 is provided with spiral ribs 7, and an air pump 9 is installed on the outer wall of the base 1, with the air outlet of the air pump 9 aligned with the water inlet of the PTC heating tube 6.

[0023] In this embodiment: When there is frost on the finned heat exchanger 2 in winter, the controller 11 controls the unit to enter defrosting mode. The finned heat exchanger 2 is converted into a condenser to heat the frost on the heat exchanger. After the frost melts into water, it enters the stepped water receiving tank 5 through the through hole 4 on the support plate 3. The stepped water receiving tank 5 accelerates the water flow speed and reduces the water residence time. The water flows into the PTC heating tube 6 through the stepped water receiving tank 5. The spiral ribs 7 inside the PTC heating tube 6 create a swirling effect to prevent the still water from freezing. When the PTC heating tube 6 has already frozen... When activated, the PTC heating element 6 (PTC heating element is existing technology; PTC heating element is made of special ceramic material and automatically heats up after being powered on. The higher the temperature, the greater the resistance, thus automatically adjusting the power to prevent overheating) actively heats up to solve the risk of freezing of small-flow water at the end and reduce energy consumption. The air pump 9 sprays 0.2MPa airflow every 10 minutes, which can periodically remove the initial ice crystals on the inner wall of the PTC heating element 6. This utility model uses the stepped water receiving groove 5 and the spiral ribs 7 to assist in ice prevention through physical structure, which can effectively reduce energy consumption.

[0024] As a technical optimization of this utility model, the inner wall of the base 1 is fixedly connected to a support plate 3 located below the finned heat exchanger 2, and the outer wall of the support plate 3 is provided with a through hole 4.

[0025] In this embodiment: the support plate 3 facilitates the support of the finned heat exchanger 2, and the through hole 4 is opened through the outer wall of the support plate 3 to facilitate the entry of water into the stepped water receiving tank 5.

[0026] As a technical optimization of this utility model, the inner wall of the stepped water receiving tank 5 is provided with a funnel 8 that communicates with the PTC heating tube 6.

[0027] In this embodiment, the funnel 8 facilitates the entry of water into the PTC heating tube 6.

[0028] As a technical optimization of this utility model, the inner wall of the stepped water receiving tank 5 is provided with multiple electric heating wires 10.

[0029] In this embodiment, the electric heating wire 10 facilitates the melting of ice when it freezes in the stepped water receiving tank 5.

[0030] As a technical optimization of this utility model, the inner walls of the stepped water receiving tank 5 and the PTC heating tube 6 are both coated with a hydrophobic layer.

[0031] In this embodiment, the hydrophobic layer is polytetrafluoroethylene or nano-hydrophobic material. By coating the inner wall of the stepped water receiving tank 5 and the PTC heating tube 6 with the hydrophobic layer, the defrosting water can slide off quickly and avoid freezing.

[0032] As a technical optimization of this utility model, the outer wall of the PTC heating tube 6 is provided with a heat insulation layer.

[0033] In this embodiment, by providing an insulation layer on the outer wall of the PTC heating tube 6, the heat loss of the PTC heating tube 6 is reduced.

[0034] As a technical optimization of this utility model, a controller 11 is provided on the outer wall of the base 1, and the finned heat exchanger 2, PTC heating tube 6, air pump 9 and electric heating wire 10 are all electrically connected to the controller 11.

[0035] In this embodiment: the controller 11 includes a microprocessor and a temperature sensing module disposed in the PTC heating tube 6, which is used to adjust the working sequence of the PTC heating tube 6 and the air pump 9 according to the ambient temperature and defrosting signal. An STM32 series microcontroller can be used.

[0036] The working principle and usage process of this utility model are as follows: When there is frost on the finned heat exchanger 2 in winter, the controller 11 controls the unit to enter the defrosting mode. The finned heat exchanger 2 is converted into a condenser to heat the frost on the heat exchanger. After the frost melts into water, it enters the stepped water receiving tank 5 through the through hole 4 on the support plate 3. The stepped water receiving tank 5 accelerates the water flow speed and reduces the water residence time. The water flows into the PTC heating tube 6 through the stepped water receiving tank 5. The spiral ribs 7 inside the PTC heating tube 6 create a swirling effect to prevent the still water from freezing. When the PTC heating tube 6... When the inside has already frozen, the PTC heating tube 6 is activated (PTC heating is an existing technology; the PTC heating tube is made of special ceramic material and automatically heats up after being powered on. The higher the temperature, the greater the resistance, thus automatically adjusting the power to prevent overheating). This active heating solves the risk of freezing of small-flow water at the end and reduces energy consumption. The air pump 9 sprays 0.2MPa airflow every 10 minutes, which can periodically remove the initial ice crystals on the inner wall of the PTC heating tube 6. This utility model uses the stepped water receiving groove 5 and the spiral ribs 7 to assist in ice prevention through physical structure, which can effectively reduce energy consumption.

[0037] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A defrosting and draining device for a low ambient air source heat pump unit, comprising a base (1), the inside of the base (1) is provided with a fin heat exchanger (2), characterized in that: The base (1) is provided with a stepped water receiving tank (5) located below the finned heat exchanger (2). The lower end of the stepped water receiving tank (5) is connected to a PTC heating tube (6). The inner wall of the PTC heating tube (6) is provided with spiral ribs (7). An air pump (9) is installed on the outer wall of the base (1). The air outlet of the air pump (9) is aligned with the water inlet of the PTC heating tube (6).

2. The defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 1, characterized in that: The inner wall of the base (1) is fixedly connected to a support plate (3) located below the finned heat exchanger (2), and the outer wall of the support plate (3) is provided with a through hole (4).

3. A defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 1, characterized in that: The inner wall of the stepped water receiving tank (5) is provided with a funnel (8) that communicates with the PTC heating pipe (6).

4. A defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 1, characterized in that: The inner wall of the stepped water receiving tank (5) is provided with multiple electric heating wires (10).

5. A defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 1, characterized in that: The inner walls of the stepped water receiving tank (5) and the PTC heating tube (6) are coated with a hydrophobic layer.

6. A defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 1, characterized in that: The outer wall of the PTC heating tube (6) is provided with a heat insulation layer.

7. A defrosting and drainage device for a low-ambient-temperature air-source heat pump unit according to claim 4, characterized in that: The outer wall of the base (1) is provided with a controller (11), and the finned heat exchanger (2), PTC heating tube (6), air pump (9) and electric heating wire (10) are all electrically connected to the controller (11).

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