Four-pipe water chiller-heater unit based on regulation and control of single heat exchanger

Abstract

The utility model relates to a divisional application of a utility model patent with the application number of 2024205791249 and the application date of 2024.3.25 and the name of a four-pipe cold and hot water unit. The utility model discloses a four-pipe cold and hot water unit based on regulation and control of a single heat exchanger. The system comprises a compressor which is respectively connected with a hot water heat exchanger and a first air heat exchanger through a first valve and a second valve, the hot water heat exchanger is connected with a first one-way valve, the first air heat exchanger is respectively connected with a first expansion valve and a second one-way valve, and the first expansion valve is connected with a fourth valve. The fourth valve, the first one-way valve and the second one-way valve are connected with a fifth valve, the fifth valve is connected with a cold water heat exchanger through a second expansion valve, the cold water heat exchanger is connected with a third one-way valve, and the third one-way valve and the third valve are both connected with the compressor. According to the utility model, cold water and hot water can be supplied at any time and can also be supplied at the same time.

Description

[0001] This application is a divisional application of the utility model patent with application number 2024205791249, application date 2024.3.25, and name “A four-pipe refrigeration and hot water unit”. Technical Field

[0002] The utility model relates to the technical field of cold and hot water units, and in particular to a four-tube cold and hot water unit based on the regulation of a single heat exchanger. Background Art

[0003] With the diversification of modern building functions, shopping malls, office buildings, hospitals, factories, and high-end residences have different functional areas, and different cooling and heating needs in various functional areas. The same functional area may also have simultaneous cooling and heating needs. In the same season, some require a cold source, some require a heat source, and some require both cold and hot sources to control temperature and humidity. The traditional method uses two systems, one system for the cold source and one system for the heat source. The cold source is generally provided by a chiller, and the heat source is usually a boiler.

[0004] At present, chillers are still the main cold and heat source supply system in large places. Conventional chillers either provide cold water or hot water. Heat pump chillers can switch water supply modes according to the seasons, providing cold water in summer and hot water in winter. When hot water is provided, the corresponding cold source is discharged into the environment, and when cold water is provided, the corresponding heat source is also discharged into the environment, resulting in a great waste of energy. At the same time, if two systems are used, the initial investment is large, the operating cost is high, and the system maintenance and management are also complicated.

[0005] How to use a set of chillers to flexibly provide cold water, hot water, and hot and cold water according to needs, effectively solve the coexistence of cold and hot needs in complex buildings, and reduce energy consumption at the same time, is a technical problem to be solved by technical personnel in this field. Utility Model Content

[0006] The utility model aims to provide a four-tube refrigeration and hot water unit based on the regulation of a single heat exchanger in view of the deficiencies in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model provides a four-pipe cooling and hot water unit based on single heat exchanger regulation, comprising at least one group of direct expansion systems, wherein the direct expansion system comprises at least one compressor, the exhaust port of the compressor is respectively connected to one end of a first valve and a second valve, the other end of the first valve is connected to the refrigerant inlet of the hot water heat exchanger, the refrigerant outlet of the hot water heat exchanger is connected to the input end of the first one-way valve, the other end of the second valve is respectively connected to the first air heat exchanger and one end of the third valve, the other end of the first air heat exchanger is respectively connected to one end of the first expansion valve and the input end of the second one-way valve, the other end of the first expansion valve is connected to one end of the fourth valve, the other end of the fourth valve and the output ends of the first one-way valve and the second one-way valve are respectively connected to one end of the fifth valve, the other end of the fifth valve is connected to one end of the second expansion valve, the other end of the second expansion valve is connected to the refrigerant inlet of the cold water heat exchanger, the refrigerant outlet of the cold water heat exchanger is connected to the input end of the third one-way valve, and the output end of the third one-way valve and the other end of the third valve are both connected to the suction port of the compressor.

[0008] Furthermore, the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all electric switch valves.

[0009] Furthermore, the first air heat exchanger is a fin-type heat exchanger.

[0010] Furthermore, the direct expansion system is a group, and the compressor is one or more than two arranged in parallel.

[0011] Furthermore, the direct expansion system comprises more than two groups.

[0012] Beneficial effects: 1. The utility model can switch between providing cold water and hot water at any time, and can also provide them at the same time, which solves the problem that air-cooled chillers can only provide one water temperature and meets the different cold and hot needs between regions.

[0013] 2. It solves the complex problem that when hot and cold water are needed in the same area at the same time, two systems need to be configured, with the air-cooled chiller providing cold water and the hot water still requiring a boiler.

[0014] 3. A plurality of direct expansion systems can be arranged in one unit of the utility model. When the cold and hot water loads change, different systems are used to operate in different working modes. When the setting of the use place changes, the different systems of the unit switch the operating modes to adjust the cooling and heating ratio and provide cold and hot water on demand.

[0015] 4. The hot water heat exchanger and the cold water heat exchanger are only responsible for one function during system operation. The components are designed and selected according to the target working conditions. The components have stable working conditions, controllable costs, guaranteed service life, and stable operation. This avoids the impact of switching between cold and hot water heat exchangers in air-cooled heat pump systems.

[0016] 5. The electric switch valve is controlled by the program to automatically switch the operation, which is simple to control and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a four-tube cooling and hot water unit of Embodiment 1 of the utility model;

[0018] Figure 2 This is a schematic diagram of the four-tube refrigeration and hot water unit for preparing hot water in the first embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the four-tube refrigeration and hot water unit for preparing cold water in the first embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the principle of preparing cold and hot water by a four-tube refrigeration and hot water unit in Embodiment 1 of the utility model.

[0021] Figure 5 It is a structural schematic diagram of a four-tube cooling and hot water unit of Embodiment 2 of the present utility model;

[0022] Figure 6 This is a schematic diagram of the four-tube refrigeration and hot water unit for preparing hot water in the second embodiment of the utility model;

[0023] Figure 7 This is a schematic diagram of the four-tube refrigeration and hot water unit for preparing cold water in the second embodiment of the utility model;

[0024] Figure 8 It is a schematic diagram of the principle of preparing cold and hot water by a four-tube refrigeration and hot water unit in Embodiment 2 of the present utility model. DETAILED DESCRIPTION

[0025] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0026] like Figures 1 to 8As shown, an embodiment of the utility model provides a four-tube cooling and hot water unit, including at least one direct expansion system, the direct expansion system includes at least one compressor 1, a control unit, a hot water heat exchanger 3 and a cold water heat exchanger 7, the control unit is connected to the compressor 1, the hot water heat exchanger 3 and the cold water heat exchanger 7 respectively, the control unit includes a plurality of valves, a plurality of one-way valves and a plurality of air heat exchangers, the plurality of valves and a plurality of one-way valves are used to control the direction of the refrigerant discharged from the compressor 1 according to the working mode, and then control whether the hot water heat exchanger 3, the cold water heat exchanger 7 and the air heat exchanger are put into operation respectively, so that the hot water heat exchanger 3 provides hot water to the outside, or the cold water heat exchanger 7 provides cold water to the outside, or the hot water heat exchanger 3 and the cold water heat exchanger 7 provide hot water and cold water to the outside respectively at the same time. Specifically, when the hot water heat exchanger 3 and the air heat exchanger are put into operation at the same time, the hot water heat exchanger 3 heats the water flowing through it, and then provides hot water to the outside; when the air heat exchanger and the cold water heat exchanger 7 are put into operation at the same time, the cold water heat exchanger 7 cools the water flowing through it, and then provides cold water to the outside; when the hot water heat exchanger 3 and the cold water heat exchanger 7 are both put into operation, hot water and cold water can be provided to the outside respectively. The above-mentioned air heat exchanger is preferably a finned heat exchanger, which promotes heat exchange with the air by arranging a fan on one side.

[0027] Embodiment 1:

[0028] In this embodiment, the control is performed based on a single air heat exchanger. Figure 1, the above-mentioned multiple valves include a first valve 2-1, a second valve 2-2, a third valve 2-3 and a fourth valve 2-4. The above-mentioned multiple one-way valves include a first one-way valve 4-1, a second one-way valve 4-2 and a third one-way valve 4-3, and the above-mentioned air heat exchanger is a first air heat exchanger 6-1. One end of the first valve 2-1 and the second valve 2-2 are respectively connected to the exhaust port of the compressor 1, the other end of the first valve 2-1 is connected to the refrigerant inlet of the hot water heat exchanger 3, the refrigerant outlet of the hot water heat exchanger 3 is connected to the input end of the first one-way valve 4-1, the other end of the second valve 2-2 is respectively connected to the first air heat exchanger 6-1 and one end of the third valve 2-3, the other end of the first air heat exchanger 6-1 is respectively connected to one end of the first expansion valve 5-1 and the input end of the second one-way valve 4-2, and the other end of the first expansion valve 5-1 is connected to One end of the fourth valve 2-4 is connected, the other end of the fourth valve 2-4 and the output ends of the first check valve 4-1 and the second check valve 4-2 are respectively connected to one end of the fifth valve 2-5, the other end of the fifth valve 2-5 is connected to one end of the second expansion valve 5-2, the other end of the second expansion valve 5-2 is connected to the refrigerant inlet of the cold water heat exchanger 7, the refrigerant outlet of the cold water heat exchanger 7 is connected to the input end of the third check valve 4-3, the output end of the third check valve 4-3 and the other end of the third valve 2-3 are both connected to the suction port of the compressor 1. The first valve 2-1, the second valve 2-2, the third valve 2-3, the fourth valve 2-4, and the fifth valve 2-5 are preferably electric switch valves.

[0029] Embodiment 2:

[0030] In this embodiment, the control is performed based on a double air heat exchanger, see Figure 5, the above-mentioned multiple valves include a sixth valve 2-6, a seventh valve 2-7, an eighth valve 2-8 and a ninth valve 2-9. The above-mentioned multiple one-way valves include a fourth one-way valve 4-4, a fifth one-way valve 4-5, a sixth one-way valve 4-6 and a seventh one-way valve 4-7, and the above-mentioned air heat exchanger includes a second air heat exchanger 6-2 and a third air heat exchanger 6-3. One end of the sixth valve 2-6 and the seventh valve 2-7 are respectively connected to the exhaust port of the compressor 1, and the other end of the sixth valve 2-6 is connected to the refrigerant inlet of the hot water heat exchanger 3. The refrigerant outlet of the hot water heat exchanger 3 is connected to the input end of the fourth one-way valve 4-4, and the other end of the seventh valve 2-7 is connected to one end of the second air heat exchanger 6-2. The other end of the second air heat exchanger 6-2 is connected to the input end of the fifth one-way valve 4-5. The output ends of the fourth one-way valve 4-4 and the fifth one-way valve 4-5 are respectively connected to one end of the eighth valve 2-8 and the ninth valve 2-9. The other end of the eighth valve 2-8 is connected to one end of the third expansion valve 5-3, the other end of the third expansion valve 5-3 is connected to one end of the third air heat exchanger 6-3, the other end of the third air heat exchanger 6-3 is connected to the input end of the sixth check valve 4-6, the other end of the ninth valve 2-9 is connected to one end of the fourth expansion valve 5-4, the other end of the fourth expansion valve 5-4 is connected to one end of the cold water heat exchanger 7, the other end of the cold water heat exchanger 7 is connected to the input end of the seventh check valve 4-7, and the output ends of the sixth check valve 4-6 and the seventh check valve 4-7 are both connected to the suction port of the compressor 1. The sixth valve 2-6, the seventh valve 2-7, the eighth valve 2-8 and the ninth valve 2-9 are all electric switch valves.

[0031] In one unit, the above-mentioned direct expansion system can be a group, and the compressor 1 can be one or more than two arranged in parallel. The direct expansion system in one unit can also be more than two groups, and the hot water heat exchanger 3, air heat exchanger and cold water heat exchanger 7 in each direct expansion system are preferably integrated into one, that is, the hot water heat exchanger 3 of each direct expansion system is integrated into one, the air heat exchanger of each direct expansion system is integrated into one, and the cold water heat exchanger 7 of each direct expansion system is integrated into one. It should be noted that the above integration means installation together, and the refrigerant pipelines of the hot water heat exchanger 3, air heat exchanger and cold water heat exchanger 7 in different direct expansion systems are independent and not connected, but the hot water heat exchanger 3 and cold water heat exchanger 7 in different direct expansion systems can heat and cool the water outside them at the same time, and the air heat exchangers in different direct expansion systems can exchange heat with the air flowing through them together.

[0032] The working principle of the first embodiment is as follows:

[0033] Operation mode 1: See Figure 2, the unit prepares hot water. In this mode, the direction of the refrigerant is shown by the single-line arrow in the figure, and the working status of each valve is as follows: the first valve 2-1, the third valve 2-3, and the fourth valve 2-4 are all powered on and opened, and the second valve 2-2 and the fifth valve 2-5 are all closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the hot water heat exchanger 3 through the first valve 2-1. In the hot water heat exchanger 3, the high-temperature refrigerant exchanges heat with water and condenses. After the condensation, the high-temperature liquid passes through the first one-way valve 4-1 and enters the fourth valve 2-4. Then, it is throttled into a low-temperature and low-pressure refrigerant through the first expansion valve 5-1 and enters the first air heat exchanger 6-1 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the third valve 2-3. The circulation of the refrigerant is completed, and hot water is output to the outside from the hot water cooler 3.

[0034] Operation mode 2: See Figure 3 , the unit prepares cold water. In this mode, the direction of the refrigerant is shown by the single-line arrow in the figure, and the working status of each valve is as follows: the second valve 2-2 and the fifth valve 2-5 are both powered on and opened, and the first valve 2-1, the third valve 2-3 and the fourth valve 2-4 are all closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the second valve 2-2 into the first air heat exchanger 6-1, and the high-temperature refrigerant exchanges heat with the air in the first air heat exchanger 6-1 to condense. The condensed high-temperature liquid passes through the second one-way valve 4-2 and enters the fifth valve 2-5, and then passes through the second expansion valve 5-2 to be throttled into a low-temperature and low-pressure refrigerant, and enters the cold water heat exchanger 7 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the third one-way valve 4-3. The circulation of the refrigerant is completed, and cold water is output to the outside from the cold water heat exchanger 7.

[0035] Operation mode 3: See Figure 4 , the unit prepares cold and hot water at the same time. In this mode, the direction of the refrigerant is shown as the single-line arrow in the figure, and the working status of each valve is as follows: the first valve 2-1 and the second valve 2-5 are both powered on and opened, and the second valve 2-2, the third valve 2-3 and the fourth valve 2-4 are closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the first valve 2-1 to the hot water heat exchanger 3, and the high-temperature refrigerant exchanges heat with water in the hot water heat exchanger 3 to condense. After the condensed high-temperature liquid passes through the first one-way valve 4-1, it enters the fifth valve 2-5, and then passes through the second expansion valve 5-2 to throttle into a low-temperature and low-pressure refrigerant, and enters the cold water heat exchanger 7 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the third one-way valve 4-3. The circulation of the refrigerant is completed, and the cold water heat exchanger 7 outputs cold water to the outside at the same time, and the hot water heat exchanger 3 outputs hot water to the outside at the same time.

[0036] The working principle of the second embodiment is as follows:

[0037] Operation mode 1: See Figure 6 , the unit prepares hot water. In this mode, the direction of the refrigerant is shown by the single-line arrow in the figure, and the working status of each valve is as follows: the sixth valve 2-6 and the eighth valve 2-8 are powered on and opened, and the seventh valve 2-7 and the ninth valve 2-9 are closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the hot water heat exchanger 3 through the sixth valve 2-6. In the hot water heat exchanger 3, the high-temperature refrigerant exchanges heat with water and condenses. After the condensation, the high-temperature liquid passes through the fourth one-way valve 4-4 and enters the eighth valve 2-8. Then, it passes through the third expansion valve 5-3 and is throttled into a low-temperature and low-pressure refrigerant, and enters the third air heat exchanger 6-3 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the sixth one-way valve 4-6. The circulation of the refrigerant is completed, and hot water is output to the outside from the hot water cooler 3.

[0038] Operation mode 2: See Figure 7 , the unit prepares cold water. In this mode, the direction of the refrigerant is shown by the single-line arrow in the figure, and the working status of each valve is as follows: the seventh valve 2-7 and the ninth valve 2-9 are powered on and opened, and the sixth valve 2-6 and the eighth valve 2-8 are closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the second air heat exchanger 6-2 through the seventh valve 2-7. In the second air heat exchanger 6-2, the high-temperature refrigerant exchanges heat with the air to condense. After the condensed high-temperature liquid passes through the fifth one-way valve 4-5, it enters the ninth valve 2-9, and then passes through the fourth expansion valve 5-4 to be throttled into a low-temperature and low-pressure refrigerant, and enters the cold water heat exchanger 7 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the seventh one-way valve 4-7. The circulation of the refrigerant is completed, and cold water is output to the outside from the cold water heat exchanger 7.

[0039] Operation mode 3: See Figure 8 , the unit prepares cold and hot water at the same time. In this mode, the direction of the refrigerant is shown by the single-line arrow in the figure, and the working status of each valve is as follows: the sixth valve 2-6 and the ninth valve 2-9 are powered on and opened, and the seventh valve 2-7 and the eighth valve 2-8 are closed. When the unit is started, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the hot water heat exchanger 3 through the sixth valve 2-6. In the hot water heat exchanger 3, the high-temperature refrigerant exchanges heat with water and condenses. After the condensation, the high-temperature liquid passes through the fourth one-way valve 4-4 and enters the ninth valve 2-9. Then, it passes through the fourth expansion valve 5-4 and is throttled into a low-temperature and low-pressure refrigerant, and enters the cold water heat exchanger 7 for evaporation. After evaporation, the low-pressure gas returns to the suction port of the compressor 1 through the seventh one-way valve 4-7. After the circulation of the refrigerant is completed, the cold water heat exchanger 7 outputs cold water to the outside at the same time, and the hot water heat exchanger 3 outputs hot water to the outside at the same time.

[0040] The above are only preferred embodiments of the present invention. It should be noted that for ordinary technicians in this technical field, other parts not specifically described belong to the prior art or common knowledge. Without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A four-pipe cooling and hot water unit based on single heat exchanger control, characterized in that: The invention comprises at least one direct expansion system, wherein the direct expansion system comprises at least one compressor (1), wherein the exhaust port of the compressor (1) is respectively connected to one end of a first valve (2-1) and one end of a second valve (2-2), the other end of the first valve (2-1) is connected to a refrigerant inlet of a hot water heat exchanger (3), the refrigerant outlet of the hot water heat exchanger (3) is connected to an input end of a first check valve (4-1), the other end of the second valve (2-2) is respectively connected to one end of a first air heat exchanger (6-1) and one end of a third valve (2-3), the other end of the first air heat exchanger (6-1) is respectively connected to one end of a first expansion valve (5-1) and an input end of a second check valve (4-2), and the The other end of the first expansion valve (5-1) is connected to one end of the fourth valve (2-4), the other end of the fourth valve (2-4) and the output ends of the first check valve (4-1) and the second check valve (4-2) are respectively connected to one end of the fifth valve (2-5), the other end of the fifth valve (2-5) is connected to one end of the second expansion valve (5-2), the other end of the second expansion valve (5-2) is connected to the refrigerant inlet of the cold water heat exchanger (7), the refrigerant outlet of the cold water heat exchanger (7) is connected to the input end of the third check valve (4-3), and the output end of the third check valve (4-3) and the other end of the third valve (2-3) are both connected to the suction port of the compressor (1).

2. A four-pipe refrigeration and hot water unit based on single heat exchanger control according to claim 1, characterized in that: The first valve (2-1), the second valve (2-2), the third valve (2-3), the fourth valve (2-4) and the fifth valve (2-5) are all electric switch valves.

3. A four-pipe refrigeration and hot water unit based on single heat exchanger control according to claim 1, characterized in that: The first air heat exchanger (6-1) is a fin-type heat exchanger.

4. A four-pipe refrigeration and hot water unit based on single heat exchanger control according to claim 1, characterized in that: The direct expansion system is a group, and the compressor (1) is one or more than two compressors arranged in parallel.

5. A four-pipe cooling and hot water unit based on single heat exchanger control according to claim 1, characterized in that: The direct expansion system comprises two or more groups.

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