CN202002245U - Defrosting variable-frequency heat pump air conditioner - Google Patents

Abstract

The utility model provides a defrosting frequency conversion heat pump air conditioner, which includes an indoor unit and an outdoor unit. The outdoor unit includes a condenser, a fan, a reversing four-way valve and a compressor, wherein one end of the condenser is connected to the indoor unit through a connecting pipe. , the other end is connected to the compressor and the indoor unit through a four-way valve, a shut-off valve is provided between the indoor unit, the condenser and the four-way valve, and a throttling mechanism is set between the shut-off valve on the connecting pipe and the condenser, A pipe heating device is provided between the throttling mechanism and the condenser. The heat pump air conditioner has no heat loss during the defrosting process, can well maintain a constant indoor temperature, has small temperature fluctuations, and improves indoor comfort.

Description

A defrosting frequency conversion heat pump air conditioner

technical field

The utility model belongs to the technical field of air conditioners, in particular to a heat pump air conditioner with a defrosting function.

Background technique

Existing air source heat pump type inverter air conditioners perform heating operation in a low temperature environment. When the evaporation temperature of the refrigerant in the outdoor heat exchanger is lower than zero and the humidity of the air reaches a certain condition, the surface of the fins of the outdoor heat exchanger will gradually Frosting, when the frost layer reaches a certain level, the heat transfer effect drops sharply. At this time, it is necessary to perform defrosting operation. Through the action of the four-way valve, the flow direction of the refrigerant changes, and the high-temperature and high-pressure gas flows into the outdoor heat exchanger to cool the throttling. The low-pressure low-temperature liquid needs to evaporate indoors to absorb a certain amount of heat to maintain the balance of the system, which will lead to discontinuous indoor heating, and even cause indoor heat loss. When the refrigerant flow direction is switched again after defrosting is completed, part of the heat will be lost to balance the evaporator. As the temperature rises, the compressor consumes energy to establish a stable pressure balance, further losing heat and exacerbating room temperature fluctuations. This is an inherent problem in the traditional reversing defrosting heat pump air conditioner.

Contents of the invention

In view of the above-mentioned problems existing in the traditional reversing defrosting type heat pump air conditioner, the utility model provides a defrosting frequency conversion heat pump air conditioner, which has no heat loss during the defrosting process and can well maintain a constant indoor temperature , The temperature fluctuation is small, which improves the indoor comfort.

The technical scheme of the utility model is: a defrosting frequency conversion heat pump air conditioner, including an indoor unit and an outdoor unit, and the outdoor unit includes a condenser, a fan, a reversing four-way valve, a throttling mechanism and a compressor, wherein the condenser One end is connected to the indoor unit through a connecting pipe and a throttling mechanism, and the other end is connected to the compressor and the indoor unit through a four-way valve. There is a stop valve between the indoor unit, the condenser and the four-way valve. A connecting pipe is provided between the condensers, and a pipe heating device is provided between the throttling mechanism and the condenser.

The pipeline heating device is installed on the connecting pipeline.

The heating method of the pipeline heating device is resistance wire heating, electromagnetic heating or PTC heating.

The compressor is a compressor with frequency conversion speed regulation function.

The principle of the utility model is that when the defrosting frequency conversion heat pump air conditioner needs to be defrosted, the four-way valve does not operate to switch the flow direction of the refrigerant, but the operating frequency (speed) of the compressor is reduced to maintain the flow of the refrigerant air flow, and the throttling mechanism and A heater is installed on the connecting pipe of the condenser. The flowing refrigerant airflow brings the heat generated by the heater into the condenser to melt the frost layer. The excess heat is released with the refrigerant into the room, which can better maintain a constant indoor temperature and smaller temperature fluctuations. Indoor comfort is higher.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a defrosting frequency conversion heat pump air conditioner includes an indoor unit 20 and an outdoor unit 10, and the outdoor unit 10 includes a condenser 1, a fan 2, a reversing four-way valve 3, a throttling mechanism 5 and a compressor 8 , wherein one end of the condenser 1 is connected to the indoor unit 20 through the connecting pipe 7 and the throttling mechanism 5, and the other end is connected to the compressor 8 and the indoor unit 20 through the four-way valve 3, and the indoor unit 20 is connected to the condenser 1 and the four-way A cut-off valve 6 is provided between the valves 3 , a connecting pipe 7 is provided between the throttling mechanism 5 and the condenser 1 , and a pipeline heating device 4 is provided between the throttling mechanism 5 and the condenser 1 .

The pipeline heating device 4 is installed on the connecting pipeline 7 .

The heating method of the pipeline heating device 4 is any one of resistance wire heating, electromagnetic heating or PTC heating.

The compressor 8 is a compressor with frequency conversion speed regulation function.

As shown in Figure 1, when the air conditioner is in heating operation, the refrigerant flow circulates in the direction indicated by the arrow. When the outdoor temperature and humidity meet the conditions, a frost layer will be formed on the fin surface of the condenser 1 of the outdoor unit 10, and the frost layer will accumulate to a certain level. The heating efficiency of the thick air conditioner drops sharply, and the air conditioner needs to perform defrosting operation. At this time, the reversing four-way valve 3 of the air conditioner does not need to be reversed, and the direction of the refrigerant flow remains unchanged. The compressor reduces the operating frequency (speed) to maintain the refrigerant air flow At the same time, the pipeline heating device 4 is energized to generate heat, and the heat flows into the condenser 1 to melt the frost layer along with the refrigerant flow, and the excess heat enters the indoor unit after passing through the compressor and is discharged until the frost layer of the condenser 1 is completely melted, and the frequency of the compressor is increased to normal Heating frequency operation, the whole defrosting process does not have refrigerant reverse flow, and there is no pressure re-establishment balance loss. It can better maintain the indoor temperature constant, the temperature fluctuation is smaller, and the indoor comfort is higher.

The above-mentioned embodiment is only an application example of the defrosting of the present invention, and other forms of air conditioners can also be implemented, such as integral heat pump air conditioners, etc., which should also be within the scope of protection required by the present invention.

Claims (4)

1. A defrosting frequency conversion heat pump air conditioner, including an indoor unit (20) and an outdoor unit (10), the outdoor unit (10) includes a condenser (1), a fan (2), a reversing four-way valve (3), A throttling mechanism (5) and a compressor (8), wherein one end of the condenser (1) is connected to the indoor unit (20) through a connecting pipe (7) and the throttling mechanism (5), and the other end is passed through a four-way valve ( 3) Connect the compressor (8) and the indoor unit (20). There is a cut-off valve (6) between the indoor unit (20), the condenser (1) and the four-way valve (3), and the throttling mechanism ( 5) A connecting pipe (7) is provided between the condenser (1), and the feature is that a pipe heating device (4) is provided between the throttling mechanism (5) and the condenser (1). 2. The defrosting frequency conversion heat pump air conditioner according to claim 1, characterized in that: the pipeline heating device (4) is installed on the connecting pipeline (7). 3. The defrosting frequency conversion heat pump air conditioner according to claim 1, characterized in that: the heating method of the pipeline heating device (4) is resistance wire heating, electromagnetic heating or PTC heating. 4. The defrosting frequency conversion heat pump air conditioner according to any one of claims 1-3, characterized in that: the compressor (8) is a compressor with frequency conversion speed regulation function.

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