CN204963283U - Ultra -low temperature air source heat pump unit - Google Patents

Abstract

The utility model discloses an ultra-low temperature air source heat pump unit, which comprises a compressor and an economizer, the compressor and the economizer are connected through an oil circuit and a freon circuit, and the freon circuit is connected with a fin exchange set in parallel. Heater and water-side heat exchanger, the utility model adopts a single-machine two-stage compressor, a two-stage compression refrigeration cycle with one-stage throttling and incomplete cooling in the middle, through the optimized design of the circulation system, the application of the economizer system, and oil cooling The application of the system and the application of the intermediate liquid injection system have solved the problems that the exhaust temperature of the conventional unit is too high and the unit cannot be started when the unit is operated in an ultra-low temperature environment.

Description

An ultra-low temperature air source heat pump unit

technical field

The utility model relates to a heat pump unit, in particular to an ultra-low temperature air source heat pump unit capable of stable operation in a low temperature environment, belonging to the field of refrigeration and air conditioning.

Background technique

With the development of society, energy conservation and environmental protection have increasingly become the key issues restricting the sustainable development of the economy and society. The comprehensive development and utilization of renewable energy has become a key direction of energy development and utilization. Since the advent of heat pump technology, it has become a research hotspot due to its unique advantages of high efficiency, energy saving and environmental protection. Heat pump energy saving technology has also been widely promoted in my country as a national key energy saving technology promotion project. Among them, the air source heat pump water heater is the fourth domestic water heater after the electric water heater, gas water heater and solar water heater. It has a high utilization rate of renewable air energy and is a remarkable energy-saving device.

Ordinary air source heat pump hot water systems have been well applied in South China and Southwest my country. However, in the cold regions of the north, or the humid and cold regions with high humidity in winter, the promotion of ordinary air source heat pump water heaters has been greatly restricted, which is mainly restricted by climatic conditions. When the outdoor temperature drops in winter, the evaporating temperature drops, and it is easy to frost on the surface of the evaporator, which reduces the heat exchange effect, reduces the heating capacity of the system, decreases the COP, and even cannot start normally. Temperature of domestic hot water, which has a series of problems, resulting in ordinary heat pump water heaters can not meet the winter heating needs in northern my country. Therefore, it is necessary to study the design and operational performance of air source heat pump water heaters that can operate stably in low temperature environments.

Utility model content

The problem to be solved by the utility model is to provide an ultra-low temperature air source heat pump unit that can operate stably in a low temperature environment to overcome the problems that the exhaust temperature is too high and the unit cannot start and run when the conventional unit operates in an ultra-low temperature environment.

In order to solve the above problems, the utility model adopts the following technical solutions:

An ultra-low temperature air source heat pump unit, including a compressor and an economizer, the compressor and the economizer are connected through an oil circuit and a freon circuit, and a fin heat exchanger arranged in parallel and a water side are connected to the freon circuit Heat Exchanger.

Below is the further optimization of the above-mentioned scheme in the utility model:

The compressor is a single-unit two-stage compressor, including one-stage compression and two-stage compression, and the circuit drawn from the economizer communicates with the intermediate chamber between the one-stage compression and the second-stage compression.

The second-stage compression and fin heat exchanger are connected through the oil separator and the four-way reversing valve in turn.

The oil separator communicates with the first stage of compression through an oil cooler and an oil filter.

The fin heat exchanger communicates with the economizer through a one-way valve group, and the water-side heat exchanger communicates with the one-way valve group and the four-way reversing valve respectively.

The water inlet of the water side heat exchanger is connected with the water inlet of the oil cooler; the water outlet of the water side heat exchanger is connected with the water outlet of the oil cooler through a pipeline, and an electric regulating valve is installed on the pipeline, and the four-way switch The gas-liquid separator communicates between the valve and the stage of compression.

The one-way valve group communicates with the economizer through two parallel pipelines, and one of the pipelines is sequentially installed with a liquid reservoir, a first solenoid valve, a first filter, a second solenoid valve and a first electronic expansion valve. valve.

The other pipeline is equipped with an electronic expansion valve and a liquid-seeing environment, and this pipeline communicates with a section of compression through a second filter, a third electromagnetic valve and a thermal expansion valve in sequence.

The utility model adopts the scheme, and its working principle is:

Refrigeration: The high-temperature and high-pressure Freon gas discharged from the compressor enters the fin heat exchanger after passing through the oil separator and the four-way reversing valve, releases heat into the air, and condenses into a medium-temperature and high-pressure Freon liquid. After the subcooling of the economizer, the electronic expansion valve throttles and reduces the pressure to become a low-pressure and low-temperature gas-liquid mixed refrigerant, which enters the water-side heat exchanger. In the water-side heat exchanger, heat is absorbed from the chilled water flowing through the shell of the water-side heat exchanger, vaporized into low-temperature and low-pressure gas, and sucked into the compressor. After one stage and two stages of compression in the compressor, it is discharged into high-temperature and high-pressure gas, and the cycle is repeated like this.

Heating: The high-temperature and high-pressure Freon gas discharged from the compressor enters the water-side heat exchanger after passing through the oil separator and the four-way reversing valve, releases heat to the water flowing through the shell of the water-side heat exchanger, and condenses into medium-temperature and high-pressure Freon liquid. After the subcooling of the economizer, the electronic expansion valve throttles and reduces the pressure to form a low-pressure low-temperature gas-liquid mixed refrigerant, which enters the fin heat exchanger. The heat is absorbed from the air in the fin heat exchanger, vaporized into a low-temperature and low-pressure gas and sucked into the compressor. After one stage and two stages of compression in the compressor, it is discharged into high-temperature and high-pressure gas, and the cycle is repeated like this.

The utility model adopts a single-machine two-stage compressor, a two-stage compression refrigeration cycle with one-stage throttling and incomplete cooling in the middle, through the optimized design of the cycle system, the application of the economizer system, the application of the oil cooling system, and the application of the intermediate liquid spray system. The application solves the problems that the exhaust temperature of the conventional unit is too high and the unit cannot be started when the unit is operated in an ultra-low temperature environment.

Ordinary air source heat pump units can only be used in environments above -7°C; air source heat pump units with air injection enthalpy can only be applied in environments above -25°C; Application, 60°C hot water can be produced at -35°C.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Description of drawings

Accompanying drawing 1 is the structural principle diagram in the utility model embodiment.

In the figure: 1-fin heat exchanger; 2-water side heat exchanger; 3-oil cooler; 4-one-way valve group; 5-liquid reservoir; 6-first solenoid valve; 7-first filter 8-economizer; 9-second solenoid valve; 10-first electronic expansion valve; 11-second electronic expansion valve; 12-visual liquid environment; 13-second filter; 14-third solenoid valve; 15-thermal expansion valve; 16-gas-liquid separator; 17-compressor; 171-one-stage compression; 172-two-stage compression; 18-electric control valve; 19-oil separator; 20-four-way reversing valve; 21 -Oil filter.

detailed description

Embodiment, as shown in Figure 1, an ultra-low temperature air source heat pump unit includes a compressor 17 and an economizer 8, and the compressor 17 and the economizer 8 are communicated through an oil circuit and a Freon circuit, and on the Freon circuit The finned heat exchanger 1 and the water side heat exchanger 2 arranged in parallel are communicated.

The compressor 17 is a single-unit two-stage compressor, including a first-stage compressor 171 and a second-stage compressor 172 , and the circuit drawn from the economizer 8 communicates with the intermediate cavity between the first-stage compressor 171 and the second-stage compressor 172 .

The second-stage compression 172 communicates with the fin heat exchanger 1 through the oil separator 19 and the four-way reversing valve 20 in sequence.

The oil separator 19 communicates with the first stage of compression 171 through the oil cooler 3 and the oil filter 21 .

The finned heat exchanger 1 communicates with the economizer 8 through the one-way valve group 4 , and the water-side heat exchanger 2 communicates with the one-way valve group 4 and the four-way reversing valve 20 respectively.

The water inlet of the water side heat exchanger 2 communicates with the water inlet of the oil cooler 3;

The water outlet of the water side heat exchanger 2 communicates with the water outlet of the oil cooler 3 through a pipeline, and an electric regulating valve 18 is installed on the pipeline.

The four-way reversing valve 20 communicates with the first-stage compressor 171 through the gas-liquid separator 16 .

The one-way valve group 4 communicates with the economizer 8 through two parallel pipelines, one of which is sequentially installed with a liquid reservoir 5, a first electromagnetic valve 6, a first filter 7, and a second electromagnetic valve 9 and the first electronic expansion valve 10.

An electronic expansion valve 11 and a liquid sight environment 12 are installed on another pipeline, and this pipeline communicates with a section of compression 171 through a second filter 13 , a third solenoid valve 14 and a thermal expansion valve 15 in sequence.

The utility model adopts a single-machine two-stage compressor, a two-stage compression refrigeration cycle with one-stage throttling and incomplete cooling in the middle, through the optimized design of the cycle system, the application of the economizer system, the application of the oil cooling system, and the application of the intermediate liquid spray system. The application solves the problems that the exhaust temperature of the conventional unit is too high and the unit cannot be started when the unit is operated in an ultra-low temperature environment.

Ordinary air source heat pump units can only be used in environments above -7°C; air source heat pump units with air injection enthalpy can only be applied in environments above -25°C; Application, 60°C hot water can be produced at -35°C.

Claims (10)

1. An ultra-low temperature air source heat pump unit, including a compressor (17) and an economizer (8), characterized in that: the compressor (17) and the economizer (8) are connected through an oil circuit and a Freon circuit , the finned heat exchanger (1) and the water side heat exchanger (2) arranged in parallel are communicated on the Freon circuit. 2. An ultra-low temperature air source heat pump unit according to claim 1, characterized in that: The compressor (17) is a single-unit two-stage compressor, including one-stage compression (171) and two-stage compression (172). The intermediate cavity between them is connected. 3. An ultra-low temperature air source heat pump unit according to claim 2, characterized in that: The second-stage compression (172) communicates with the finned heat exchanger (1) through the oil separator (19) and the four-way reversing valve (20) in sequence. 4. An ultra-low temperature air source heat pump unit according to claim 3, characterized in that: The oil separator (19) communicates with the first stage of compression (171) through an oil cooler (3) and an oil filter (21). 5. An ultra-low temperature air source heat pump unit according to claim 4, characterized in that: The finned heat exchanger (1) communicates with the economizer (8) through the one-way valve group (4), and the water-side heat exchanger (2) communicates with the one-way valve group (4) and the four-way reversing valve (20 ) are respectively connected. 6. An ultra-low temperature air source heat pump unit according to claim 5, characterized in that: The water inlet of the water side heat exchanger (2) communicates with the water inlet of the oil cooler (3). 7. An ultra-low temperature air source heat pump unit according to claim 6, characterized in that: The water outlet of the water side heat exchanger (2) is connected with the water outlet of the oil cooler (3) through a pipeline, and an electric regulating valve (18) is installed on the pipeline. 8. An ultra-low temperature air source heat pump unit according to claim 7, characterized in that: The four-way reversing valve (20) communicates with the first stage of compression (171) through a gas-liquid separator (16). 9. An ultra-low temperature air source heat pump unit according to claim 8, characterized in that: The one-way valve group (4) communicates with the economizer (8) through two parallel pipelines, one of which is sequentially installed with a liquid reservoir, a first solenoid valve (6), a first filter ( 7), the second solenoid valve (9) and the first electronic expansion valve (10). 10. An ultra-low temperature air source heat pump unit according to claim 9, characterized in that: An electronic expansion valve (11) and a liquid sight (12) are installed on the other pipeline, and the pipeline passes through the second filter (13), the third electromagnetic valve (14) and the compressor (171) sequentially. ) communicate with the thermal expansion valve (15).