Low-emission safety type cold and heat combined heat supply recovery system

Abstract

The utility model discloses a low-emission safety type cold and hot combined heat supply recovery system which comprises a compressor, a heat recovery heat exchanger, a first throttling device, a four-way valve, a condenser, a second throttling device, an evaporator, a heat preservation water tank, a circulating pump, a water inlet insulation valve and a water outlet insulation valve. The cold and heat combined supply system which is simple in pipeline process and low-pressure in operation of the condensing evaporator is used for heat recovery, refrigerant leakage risk and leakage during operation of the system can be reduced, greenhouse effect is relieved, safety, reliability and cost performance of the system are improved, and energy is saved.

Description

Technical Field

[0001] The utility model relates to a low-emission safe combined heat and cooling heat recovery system, in particular to a combined heat and cooling heat recovery system in which a condensing evaporator operates at low pressure to produce hot water, thereby reducing the risk and amount of refrigerant leakage, and belongs to the field of HVAC energy-saving technology. Background Art

[0002] Energy conservation and emission reduction are important ways to achieve the goals of carbon peak and carbon neutrality. Air conditioning heat pumps are high-energy-consuming equipment commonly used in modern life and production. Most of the refrigerants currently used have a greenhouse effect, so energy conservation and emission reduction are of great significance. The amount of refrigerant required for air conditioning heat pumps to operate under different working conditions is different, so the system often needs to be equipped with a liquid storage tank, which increases the amount of refrigerant filling and cost; the welds and interfaces of the pipeline system of air conditioning heat pumps are difficult to be absolutely sealed, and a certain amount of leakage is inevitable during long-term operation. Heat pumps require a higher condensing pressure to make hot water. When the condenser or evaporator of the current trigeneration system is in a high-pressure zone when making hot water, it will increase the risk and amount of refrigerant leakage and aggravate the greenhouse effect; trigeneration technology has a good cost-effectiveness and energy-saving effect, but it is generally reflected that the pipelines are complex, there are many interfaces and potential leakage points, the system control reliability is poor, the failure rate is high, and it is difficult to popularize market applications; the trigeneration system is a system that uses electricity for cooling and heating to make hot water, and how to further improve the safety of electricity use is also a technical measure that must be considered. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a safe combined heat and cold supply heat recovery system with a simple piping process, a small amount of refrigerant filling, and a condensing evaporator operating at low pressure to produce hot water, thereby reducing the risk and amount of refrigerant leakage during system operation, while improving system safety, reliability and cost-effectiveness, saving energy, and reducing greenhouse gas leakage and emissions.

[0004] Technical solution: The low-emission safe combined heat and cooling heat recovery system described in the utility model includes a low-emission combined heat and cooling heat recovery system; the low-emission combined heat and cooling heat recovery system includes a compressor, a heat recovery heat exchanger, a first throttling device, a four-way valve, a condenser, a second throttling device and an evaporator; the exhaust port of the compressor is connected to the refrigerant inlet of the heat recovery heat exchanger through a pipeline; the refrigerant outlet of the heat recovery heat exchanger is connected to the inlet of the first throttling device through a pipeline; the outlet of the first throttling device is connected to the a interface of the four-way valve through a pipeline; the b interface of the four-way valve is connected to the inlet of the condenser through a pipeline; the outlet of the condenser is connected to the inlet of the second throttling device through a pipeline; the outlet of the second throttling device is connected to the inlet of the evaporator through a pipeline; the outlet of the evaporator is connected to the d interface of the four-way valve through a pipeline; the c interface of the four-way valve is connected to the air inlet of the compressor through a pipeline.

[0005] The low-emission and safe combined heat and cold supply heat recovery system of the utility model also includes an insulated water tank, a circulating pump, an inlet insulating valve and an outlet insulating valve; the water outlet of the insulated water tank is connected to the inlet of the circulating pump through a pipeline; the outlet of the circulating pump is connected to the water inlet of the heat recovery heat exchanger through a pipeline; the water outlet of the heat recovery heat exchanger is connected to the water inlet of the insulated water tank through a pipeline; the inlet insulating valve and the outlet insulating valve are ball valves made of insulating materials such as PPR, and are respectively installed on the inlet and outlet pipes of the insulated water tank.

[0006] Compared with the prior art, the present invention has the following beneficial effects: (1) The low-emission and safe combined heat and cooling heat recovery system of the present invention requires less refrigerant, which can reduce costs and greenhouse gas emissions; (2) The low-emission and safe combined heat and cooling heat recovery system of the present invention recovers heat through low-pressure operation of the condensing evaporator, which can reduce the risk and amount of refrigerant leakage during system operation and reduce the greenhouse effect; (3) The low-emission and safe combined heat and cooling heat recovery system and method of the present invention have a simple process, simple control, reliable operation, and are easy to market and popularize, which is beneficial to energy conservation and emission reduction; (4) The low-emission and safe combined heat and cooling heat recovery system of the present invention further improves the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the utility model.

[0008] In the figure: 1. evaporator, 2. second throttling device, 3. condenser, 4. water inlet insulating valve, 5. insulated water tank, 6. four-way valve, 7. compressor, 8. first throttling device, 9. heat recovery heat exchanger, 10. circulating pump, 11. water outlet insulating valve. DETAILED DESCRIPTION

[0009] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0010] Embodiment 1:

[0011] like Figure 1As shown, the low-emission safety combined heat and cooling heat recovery system of the utility model includes a low-emission combined heat and cooling heat recovery system; the low-emission combined heat and cooling heat recovery system includes a compressor 7, a heat recovery heat exchanger 9, a first throttling device 8, a four-way valve 6, a condenser 3, a second throttling device 2 and an evaporator 1; the exhaust port of the compressor 7 is connected to the refrigerant inlet of the heat recovery heat exchanger 9 through a pipeline; the refrigerant outlet of the heat recovery heat exchanger 9 is connected to the inlet of the first throttling device 8 through a pipeline; the outlet of the first throttling device 8 is connected to the a interface of the four-way valve 6 through a pipeline; the b interface of the four-way valve 6 is connected to the inlet of the condenser 3 through a pipeline; the outlet of the condenser 3 is connected to the inlet of the second throttling device 2 through a pipeline; the outlet of the second throttling device 2 is connected to the inlet of the evaporator 1 through a pipeline; the outlet of the evaporator 1 is connected to the d interface of the four-way valve 6 through a pipeline; the c interface of the four-way valve 6 is connected to the air inlet of the compressor 7 through a pipeline.

[0012] The low-emission and safe combined heat and cold supply heat recovery system of the utility model also includes an insulated water tank 5, a circulating pump 10, an inlet insulating valve 4 and an outlet insulating valve 11; the water outlet of the insulated water tank 5 is connected to the inlet of the circulating pump 10 through a pipeline; the outlet of the circulating pump 10 is connected to the water inlet of the heat recovery heat exchanger 9 through a pipeline; the water outlet of the heat recovery heat exchanger 9 is connected to the water inlet of the insulated water tank 5 through a pipeline; the inlet insulating valve 4 and the outlet insulating valve 11 are ball valves made of insulating materials such as PPR, and are respectively installed on the inlet and outlet pipes of the insulated water tank 5.

[0013] The specific refrigeration steps of the low-emission safety combined heat and cold supply heat recovery system of the utility model are: the control system adjusts the first throttling device 8 to the maximum opening, adjusts the second throttling device 2 to the appropriate opening, connects the a and b interfaces of the four-way valve 6, starts the compressor 7, and the working medium is compressed through the heat recovery heat exchanger 9 and the refrigerant channel of the first throttling device 8 through the a and b interfaces of the four-way valve 6 to enter the condenser 3 to condense and release heat, and then enters the evaporator 1 to evaporate and absorb heat after throttling by the second throttling device 2, and then enters the compressor 7 through the d and c interfaces of the four-way valve 6. The above process is repeated to realize the refrigeration operation of the system.

[0014] The specific heating steps of the low-emission safety combined heat and cold supply heat recovery system of the utility model are: the control system adjusts the first throttling device 8 to the maximum opening, adjusts the second throttling device 2 to the appropriate opening, connects the a and d interfaces of the four-way valve 6, starts the compressor 7, and the working medium is compressed through the heat recovery heat exchanger 9 and the refrigerant channel of the first throttling device 8 through the a and d interfaces of the four-way valve 6 to enter the evaporator 1 to condense and release heat, and then enters the condenser 3 to evaporate and absorb heat after throttling by the second throttling device 2, and then enters the compressor 7 through the b and c interfaces of the four-way valve 6. The above process is repeated to realize the heating operation of the system.

[0015] The specific steps of single heat recovery in the low-emission and safe combined heat and cold supply heat recovery system of the utility model are as follows: open the water inlet insulation valve 4 and the water outlet insulation valve 11, the control system adjusts the first throttling device 8 to an appropriate opening, adjusts the second throttling device 2 to a maximum opening, connects the a and b interfaces of the four-way valve 6, starts the circulation 10 and the compressor 7, the working medium is compressed and enters the heat recovery heat exchanger 9 to condense and release heat, and then enters the condenser 3 through the a and b interfaces of the four-way valve 6 after throttling by the first throttling device 8 to evaporate and absorb heat, and then enters the compressor 7 through the second throttling device 2 and the refrigerant channel of the evaporator 1 and the d and c interfaces of the four-way valve 6, the water in the insulated water tank 5 is transported by the circulating pump 10 into the heat recovery heat exchanger 9 to absorb heat and then flows back to the insulated water tank 5, the above process is cyclically carried out to realize the single heat recovery operation of the system; when using hot water, close the water inlet insulation valve 4 and the water outlet insulation valve 11 to isolate the insulated water tank 5 from the live equipment, thereby further improving the safety of use.

[0016] The specific steps of refrigeration and heat recovery of the low-emission safety combined heat and cold supply heat recovery system of the utility model are as follows: open the water inlet insulation valve 4 and the water outlet insulation valve 11, the control system adjusts the first throttling device 8 to an appropriate opening, adjusts the second throttling device 2 to a maximum opening, connects the a and d interfaces of the four-way valve 6, starts the circulation pump 10 and the compressor 7, the working medium is compressed and enters the heat recovery heat exchanger 9 to condense and release heat, and then enters the evaporator 1 through the a and d interfaces of the four-way valve 6 after throttling by the first throttling device 8 to evaporate and absorb heat, and then enters the compressor 7 through the refrigerant channel of the second throttling device 2 and the condenser 3 and the b and c interfaces of the four-way valve 6, the water in the insulated water tank 5 is transported by the circulation pump 10 into the heat recovery heat exchanger 9 to absorb heat and then flows back to the insulated water tank 5, the above process is cyclically performed to realize the system refrigeration and heat recovery operation; when using hot water, close the water inlet insulation valve 4 and the water outlet insulation valve 11 to isolate the insulated water tank 5 from the live equipment, thereby further improving the safety of use.

[0017] The specific steps of the low-emission safety type combined heat and cold supply heat recovery system of the utility model for heating and heat recovery are as follows: open the water inlet insulation valve 4 and the water outlet insulation valve 11, the control system adjusts the first throttling device 8 to the maximum opening, adjusts the second throttling device 2 to the appropriate opening, connects the a and d interfaces of the four-way valve 6, starts the circulation pump 10 and the compressor 7, and the working medium releases sensible heat and part of latent heat through the heat recovery heat exchanger 9, and then is compressed through the refrigerant channel of the first throttling device 8 and the a and d interfaces of the four-way valve 6 to enter the evaporator 1 for condensation and heat release, and passes through the second After throttling by the throttling device 2, the water enters the condenser 3 to evaporate and absorb heat, and then enters the compressor 7 through the b and c interfaces of the four-way valve 6; the water in the insulated water tank 5 is transported by the circulating pump 10 into the heat recovery heat exchanger 9 to absorb heat and then flows back to the insulated water tank 5; when the condensing pressure reaches the operating pressure of the heating mode, it switches to the heating or single heat recovery operation mode; the above process is cyclically carried out to realize system heating and heat recovery operation at the same time; when using hot water, the water inlet insulation valve 4 and the water outlet insulation valve 11 are closed to isolate the insulated water tank 5 from the live equipment, thereby further improving the safety of use.

[0018] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A low-emission safe combined cooling and heating heat recovery system, characterized by: The invention comprises a low-emission combined heat and cooling heat recovery system; the low-emission combined heat and cooling heat recovery system comprises a compressor (7), a heat recovery heat exchanger (9), a first throttling device (8), a four-way valve (6), a condenser (3), a second throttling device (2) and an evaporator (1); the exhaust port of the compressor (7) is connected to the refrigerant inlet of the heat recovery heat exchanger (9) through a pipeline; the refrigerant outlet of the heat recovery heat exchanger (9) is connected to the inlet of the first throttling device (8) through a pipeline; the first throttling device (8) The outlet of the four-way valve (6) is connected to the a interface of the four-way valve (6) through a pipeline; the b interface of the four-way valve (6) is connected to the inlet of the condenser (3) through a pipeline; the outlet of the condenser (3) is connected to the inlet of the second throttling device (2) through a pipeline; the outlet of the second throttling device (2) is connected to the inlet of the evaporator (1) through a pipeline; the outlet of the evaporator (1) is connected to the d interface of the four-way valve (6) through a pipeline; the c interface of the four-way valve (6) is connected to the air inlet of the compressor (7) through a pipeline.

2. The low-emission safe combined cooling and heating heat recovery system according to claim 1 is characterized by: It also includes an insulated water tank (5), a circulating pump (10), an insulated water inlet valve (4) and an insulated water outlet valve (11); the water outlet of the insulated water tank (5) is connected to the inlet of the circulating pump (10) through a pipeline; the outlet of the circulating pump (10) is connected to the water inlet of the heat recovery heat exchanger (9) through a pipeline; the water outlet of the heat recovery heat exchanger (9) is connected to the water inlet of the insulated water tank (5) through a pipeline; the insulated water inlet valve (4) and the insulated water outlet valve (11) are insulating ball valves, which are respectively installed on the inlet and outlet pipes of the insulated water tank (5).

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