Air conditioning hot water system

Abstract

The present invention provides an air conditioning hot water system, including a primary pump loop on the heat source side, a secondary pump loop for delivery, and a tertiary pump loop on the user side; the primary pump loop on the heat source side includes a hot water boiler, a primary hot water pump, a boiler return water temperature sensor, an electric three-way valve and its supply and return water pipelines; the secondary pump loop for delivery includes a secondary hot water pump, a pressure difference sensor and its supply and return water pipelines; the tertiary pump loop on the user side includes a tertiary hot water pump, a user water supply temperature sensor, a terminal air conditioning device, and an electric regulating valve and its supply and return water pipelines; a balancing pipe is provided between the primary and secondary pump loops and between the secondary and tertiary pump loops. This system reduces the operating resistance of the entire air conditioning hot water system by eliminating the intermediate heat exchanger and adopting a direct hot water supply method, which can greatly save the operating energy consumption of the primary and tertiary hot water pumps; at the same time, by adopting the double water mixing technology on the heat source side and the user side, the secondary pump loop can be transported with a super large temperature difference, which can greatly reduce the transportation energy consumption of the secondary hot water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning hot water systems including boilers, and in particular to an air-conditioning hot water system. Background Art

[0002] At present, for large-scale projects in the Yangtze River Basin and the area north of the Yangtze River, if the project base has no waste heat or urban heating network, hot water boilers are often used as the heat source for air conditioning. The main forms of air conditioning hot water systems involving boilers on the market are pressurized hot water boilers with plate heat exchangers and vacuum boiler hot water direct supply systems.

[0003] For the hot water system with a pressurized hot water boiler and a plate exchanger, due to the structure, material and operating characteristics of the boiler itself, the return water temperature of the air conditioning hot water should not be too low, and should not be lower than 60°C. If it is lower than 60°C, the flue gas at the tail of the smoke pipe will condense, and the condensed water is acidic (such as the acidic gas SO2 produced by coal combustion dissolves in water, causing the condensed water to be acidic), which will corrode the boiler body, so the manufacturer often requires the return water temperature to be no lower than 60°C. For the air conditioning terminal, the air conditioning water supply temperature often does not need to be too high, and the temperature difference cannot be too large (the temperature difference is generally about 5 to 15°C), so it is often required that the terminal water supply temperature is not higher than 60°C, and the supply and return water temperature difference is not greater than 15°C. For hot water transportation, the greater the temperature difference, the more energy consumption can be saved. From the perspective of energy saving, a larger temperature difference should be pursued as much as possible for transportation. Therefore, in order to solve the contradictions that the boiler return water temperature cannot be too low, the terminal water supply temperature cannot be too high, the temperature difference cannot be too large, and the largest temperature difference is desired for transportation, for the pressure hot water boiler, the design often uses plate heat exchangers to separate the two water systems, forming a boiler primary water system and a terminal secondary water system. The primary water system operates at high temperature and a large temperature difference (15-30°C), and uses the temperature difference as much as possible for transportation to save transportation energy consumption. The secondary water system supply and return water temperature uses a plate heat exchanger for secondary heat exchange according to the terminal demand. However, this system needs to be used through a plate heat exchanger during operation, which increases the resistance of the hot water system and increases the energy consumption of the system operation. It can be seen that the hot water system using a pressure hot water boiler plus a plate heat exchanger has the disadvantages of increased plate heat exchange resistance and a transportation temperature difference that cannot exceed 25-30°C due to the characteristics of the boiler heat exchanger. If a larger temperature difference is used for transportation, the boiler heat exchanger cannot achieve a heating process with a larger temperature difference.

[0004] For the direct hot water supply system of the vacuum hot water boiler, although the plate heat exchanger in the middle is avoided, the vacuum boiler is actually equivalent to building the plate heat exchanger into the boiler body, which greatly increases the resistance of the boiler body; at the same time, the hot water of the vacuum hot water boiler is directly supplied to the air-conditioning terminal. Affected by the use characteristics of the air-conditioning terminal, the maximum temperature difference between the boiler's supply and return water and the system's hot water transportation temperature difference are often only 15°C, and it is impossible to achieve long-distance large temperature difference transportation to save energy. Summary of the invention

[0005] The invention provides an air-conditioning hot water system to solve the technical problems of small hot water transmission temperature difference and high operating energy consumption in the existing air-conditioning hot water system.

[0006] In order to solve the above technical problems, the present invention provides an air conditioning hot water system, comprising a primary pump loop on the heat source side, a secondary pump loop for delivery, and a tertiary pump loop on the user side;

[0007] The heat source side primary pump loop includes a hot water boiler, a hot water primary pump, a boiler return water temperature sensor, an electric three-way valve, a primary pump loop water supply pipeline and a primary pump loop return pipeline;

[0008] The secondary pump loop for delivery includes a hot water secondary pump, a secondary pump loop remote pressure differential sensor, a secondary pump loop water supply pipeline and a secondary pump loop return pipeline;

[0009] The user-side three-stage pump loop includes a hot water three-stage pump, a user water supply temperature sensor, a terminal air conditioning device and an electric regulating valve, a user-side adverse loop pressure difference sensor, a three-stage pump loop water supply pipeline and a three-stage pump loop return pipeline;

[0010] The hot water boiler comprises a water inlet and a water outlet, one end of the primary pump loop return water pipeline is connected to the water inlet of the hot water boiler, and the other end is connected to the secondary pump loop return water pipeline; one end of the primary pump loop water supply pipeline is connected to the water outlet of the hot water boiler, and the other end is connected to the secondary pump loop water supply pipeline; the hot water primary pump and the boiler return water temperature sensor are both installed on the primary pump loop return water pipeline and are located at the rear side of the bypass branch of the electric three-way valve; the electric three-way valve comprises a first port, a second port and a third port, the first port is connected to the water supply pipeline of the hot water boiler, the second port is connected to the water pump suction side of the secondary pump loop water supply pipeline, and the third port is connected to the primary pump loop return water pipeline; a temperature adjustment measure is provided between the boiler return water temperature sensor and the electric three-way valve, the boiler return water temperature sensor is used to detect the water temperature entering the hot water boiler, and control the opening of the third port of the electric three-way valve according to the detected water temperature;

[0011] The outlet side of the hot water secondary pump is transported to each unit through the secondary pump loop water supply pipeline, and the suction side of the hot water tertiary pump is connected to the secondary pump loop water supply pipeline; the secondary pump loop far-end differential pressure sensor is arranged between the supply and return water pipes of the unit farthest from the hot water secondary pump; the water pump suction side of the secondary pump loop water supply pipeline and the secondary pump loop return water pipe are connected through a heat source side balance pipe;

[0012] In each monomer, the water supply of the hot water three-stage pump is transported to each air-conditioning equipment through the three-stage pump loop water supply pipeline, and the water inlet of each air-conditioning equipment is connected to the three-stage pump loop water supply pipeline; the three-stage pump loop water supply pipeline and the three-stage pump loop return pipeline are connected through the user-side balancing pipe; the three-stage pump loop return pipeline is connected to the two-stage pump loop return pipeline and the electric regulating valve is set; the user water supply temperature sensor is installed on the three-stage pump loop water supply pipeline and is located on the rear side of the user-side balancing pipe; a temperature control adjustment measure is provided between the user water supply temperature sensor and the electric regulating valve, and the user water supply temperature sensor is used to detect the water temperature entering the water inlet of the air-conditioning equipment, and control the opening of the electric regulating valve according to the detected water temperature.

[0013] Optionally, the air-conditioning hot water system includes a plurality of primary pump loops on the heat source side connected in parallel.

[0014] Optionally, a plurality of the hot water secondary pumps connected in parallel are arranged on the secondary pump loop water supply pipeline.

[0015] Optionally, the air-conditioning hot water system includes a plurality of user-side three-stage pump loops connected in parallel.

[0016] Optionally, when a plurality of the heat source side primary pump loops are connected in parallel, an electric switch valve is provided on the return water pipeline of the primary pump loop, and an interlocking start-stop control is provided between the electric switch valve and the hot water boiler.

[0017] Optionally, each of the user-side three-stage pump loops includes a user-side unfavorable loop pressure difference sensor; the user-side unfavorable loop pressure difference sensor is arranged between the supply and return water pipelines at the most unfavorable end of the user-side three-stage pump loop.

[0018] Optionally, on the tertiary pump loop return main pipe close to the hot water secondary pump, a static balancing valve is provided on the connecting pipeline between the tertiary pump loop return main pipe and the secondary pump loop return main pipe.

[0019] An air-conditioning hot water system provided by the present invention respectively arranges water mixing measures on the boiler heat source side and the user side, thereby forming a double water mixing system in which water mixing is adopted at both ends of the heat source side and the user side, eliminates the conventional pressurized hot water boiler and the intermediate plate exchanger on the user side, reduces the operating resistance of the entire air-conditioning hot water system, and can greatly save the operating energy consumption of the first-stage hot water pump and the third-stage hot water pump; at the same time, because the system adopts the double water mixing technical measure in which water mixing is arranged on the boiler heat source side and the user side, it can realize the use of ultra-large temperature difference transportation for the second-stage pump loop for transportation (such as temperature difference transportation of more than 40°C), which can greatly reduce the transportation energy consumption of the second-stage hot water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an air conditioning hot water system provided by one embodiment of the present invention.

[0021] [Description of reference numerals is as follows]:

[0022] 1-hot water boiler; 2-hot water primary pump; 3-boiler return water temperature sensor; 4-electric three-way valve; 5-electric switch valve; 6-balance pipe on heat source side; 7-hot water secondary pump; 8-secondary pump loop remote pressure difference sensor; 9-user side unfavorable loop pressure difference sensor; 10-hot water tertiary pump; 11-user water supply temperature sensor; 12-user side balance pipe; 13-electric regulating valve; 14-static balancing valve; 15-primary pump loop water supply pipeline; 16-primary pump loop return pipeline; 17-secondary pump loop water supply pipeline; 18-secondary pump loop return pipeline; 19-tertiary pump loop water supply pipeline; 20-tertiary pump loop return pipeline. DETAILED DESCRIPTION

[0023] In order to make the purpose, advantages and features of the present invention more clear, an air conditioning hot water system proposed by the present invention is further described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] like Figure 1As shown, this embodiment provides an air-conditioning hot water system, including a primary pump loop on the heat source side, a secondary pump loop for delivery, and a tertiary pump loop on the user side; the primary pump loop on the heat source side includes a hot water boiler 1, a primary hot water pump 2, a boiler return water temperature sensor 3, an electric three-way valve 4, a primary pump loop water supply pipeline 15, and a primary pump loop return water pipeline 16; the secondary pump loop for delivery includes a hot water secondary pump 7, a secondary pump loop remote pressure difference sensor 8, a secondary pump loop water supply pipeline 17, and a secondary pump loop return water pipeline 18; the user side tertiary pump loop includes a hot water tertiary pump 10, a user water supply temperature sensor 11, a terminal air conditioning device, an electric regulating valve 13, a user side adverse loop pressure difference sensor 9, and a tertiary pump loop The hot water boiler 1 includes a water inlet and a water outlet, one end of the primary pump loop return water pipeline 16 is connected to the water inlet of the hot water boiler 1, and the other end of the primary pump loop return water pipeline 16 is connected to one end of the secondary pump loop return water pipeline 18; one end of the primary pump loop water supply pipeline 15 is connected to the water outlet of the hot water boiler 1, and the other end of the primary pump loop water supply pipeline 15 is connected to one end of the secondary pump loop water supply pipeline 17; the hot water primary pump 2 and the boiler return water temperature sensor 3 are both installed on the primary pump loop return water pipeline 16, and are located on the rear side of the bypass branch of the electric three-way valve 4, and the rear side refers to the area close to the hot water One side of the water inlet of the boiler 1; the electric three-way valve 4 includes a first port, a second port and a third port (the third port is the bypass branch of the electric three-way valve 4), the first port is connected to the water supply pipeline of the hot water boiler 1, the second port is connected to the water pump suction side of the secondary pump loop water supply pipeline 17 (that is, the suction side of the hot water secondary pump 7), and the third port is connected to the primary pump loop return pipeline 16; a temperature adjustment measure is provided between the boiler return water temperature sensor 3 and the electric three-way valve 4, the boiler return water temperature sensor 3 is used to detect the water temperature entering the hot water boiler 1, and control the opening (bypass opening) of the third port of the electric three-way valve 4 according to the detected water temperature; The outlet side of the hot water secondary pump 7 is transported to each monomer through the secondary pump loop water supply pipeline 17, and the suction side of the hot water tertiary pump 10 is connected to the secondary pump loop water supply pipeline 17; the secondary pump loop far-end differential pressure sensor 8 is arranged between the supply and return water pipes of the monomer farthest from the hot water secondary pump 7; the water pump suction side of the secondary pump loop water supply pipeline 17 (i.e. the suction side of the hot water secondary pump 7) and the secondary pump loop return water pipeline 18 are connected through the heat source side balance pipe 6; in each monomer, the water supply of the hot water tertiary pump 10 is transported to each air-conditioning equipment through the tertiary pump loop water supply pipeline 19, and the water inlet of each air-conditioning equipment is connected to the tertiary pump loop water supply pipeline 19;The three-stage pump loop water supply pipeline 19 (the suction side of the hot water three-stage pump 10) and the three-stage pump loop return pipeline 20 are connected through the user-side balance pipe 12; the three-stage pump loop return pipeline 20 is connected to the two-stage pump loop return pipeline 18 and is provided with the electric regulating valve 13; the user water supply temperature sensor 11 is installed on the three-stage pump loop water supply pipeline 19 (the suction side of the hot water three-stage pump 10) and is located at the rear side of the user-side balance pipe 12 (the rear side is the side of the water flow direction). A temperature control and adjustment measure is provided between the user water supply temperature sensor 11 and the electric regulating valve 13, and the user water supply temperature sensor 11 is used to detect the water temperature entering the water inlet of the air-conditioning equipment, and control the opening of the electric regulating valve 13 according to the detected water temperature. ;

[0025] The air conditioning equipment can also be called an air conditioning terminal. The water temperature in the secondary pump loop water supply pipeline 17 can be about 85°C, the water temperature in the secondary pump loop water return pipeline 18 can be about 45°C, and the water temperature difference between the secondary pump loop water supply pipeline 17 and the secondary pump loop water return pipeline 18 can reach more than 40°C.

[0026] The water outlet of the hot water boiler 1 is provided with an electric three-way valve 4. The temperature detection point of the boiler return water temperature sensor 3 can be set at the inlet or outlet of the hot water primary pump 2. The opening of the electric three-way valve 4 is controlled according to the temperature T measured by the boiler return water temperature sensor 3 and the set temperature T0 to ensure that the temperature of the boiler return water temperature sensor 3 is within the set value (such as the attached Figure 1 60°C is set in the middle), that is, the inlet temperature of the hot water boiler 1 is ensured to be equal to the set value (60°C).

[0027] When the boiler return water temperature sensor 3 measures a temperature T>T0 (60°C), the bypass opening of the electric three-way valve 4 is reduced to reduce the flow of boiler water supply entering the mixing pump (the mixing pump is the hot water primary pump) to ensure that the monitoring temperature T of the boiler return water temperature sensor 3 is reduced so that T=T0 (60°C), that is, to ensure that the inlet water temperature entering the hot water boiler 1 is equal to the set value (60°C).

[0028] When the boiler return water temperature sensor 3 measures the temperature T=T0 (60°C), the bypass opening of the electric three-way valve 4 is maintained unchanged to maintain the flow rate of the boiler supply water entering the mixing water pump unchanged, so as to ensure that the monitoring temperature T of the boiler return water temperature sensor 3 remains unchanged, that is, T=T0 (60°C), that is, to ensure that the inlet water temperature entering the hot water boiler 1 is equal to the set value (60°C).

[0029] When the temperature T measured by the boiler return water temperature sensor 3 is less than T0 (60 °C), increase the bypass opening of the electric three-way valve 4 to increase the flow rate of the boiler water supply into the mixing water pump, so as to ensure that the monitored temperature T of the boiler return water temperature sensor 3 increases, making T = T0 (60 °C), that is, ensuring that the inlet water temperature of the hot water boiler 1 is equal to the set value (60 °C).

[0030] An electric control valve 13 is provided on the return water pipeline 20 of the three-stage pump loop. The temperature detection point of the user water supply temperature sensor 11 can be set at the inlet or outlet of the hot water three-stage pump 10. According to the monitored value T of the user water supply temperature sensor 11 and the set value T0, control the opening of the electric control valve 13 to ensure that the monitored temperature T of the temperature sensor 11 is maintained at the set value T0, that is, ensuring that the inlet water temperature of the air conditioning equipment is at the set value (such as 60 °C).

[0031] When the monitored value T of the user water supply temperature sensor 11 is greater than T0, reduce the opening of the electric control valve 13 to reduce the hot water flow rate from the secondary pump loop for conveying into the user-side three-stage pump loop. At this time, the return water flow rate of the three-stage pump loop return water pipeline 20 flowing from the user-side balance pipe 12 to the three-stage pump loop water supply pipeline 19 increases, and then the monitored value T of the user water supply temperature sensor 11 decreases, making T = T0 (such as 60 °C).

[0032] When the monitored value T of the user water supply temperature sensor 11 is equal to T0, maintain the opening of the electric control valve 13 unchanged to maintain the hot water flow rate from the secondary pump conveying loop for conveying into the user-side three-stage pump loop unchanged. At this time, the return water flow rate of the three-stage pump loop return water pipeline 20 flowing from the user-side balance pipe 12 to the three-stage pump loop water supply pipeline 19 remains unchanged, and the monitored value T of the user water supply temperature sensor 11 remains unchanged, that is, T = T0 (such as 60 °C).

[0033] When the monitored value T of the user water supply temperature sensor 11 is less than T0, increase the opening of the electric control valve 13 to increase the hot water flow rate from the secondary pump conveying loop for conveying into the user-side three-stage pump loop. At this time, the return water flow rate of the three-stage pump loop return water pipeline 20 flowing from the user-side balance pipe 12 to the three-stage pump loop water supply pipeline 19 decreases, and then the monitored value T of the user water supply temperature sensor 11 increases, making T = T0 (such as 60 °C).

[0034] According to the monitored value of the secondary pump loop remote differential pressure sensor 8, the operating frequency and / or the number of units of the hot water secondary pump 7 can be controlled in real time.

[0035] The hot water secondary pump 7 performs the operation number and frequency conversion adjustment according to the monitored differential pressure P of the secondary pump loop remote differential pressure sensor 8 at the end of the secondary pump loop for conveying and the set differential pressure P0, ensuring that the monitored differential pressure P of the secondary pump loop remote differential pressure sensor 8 is maintained at the set value P0 (such as 10 kPa).

[0036] When the monitored pressure difference P of the remote pressure difference sensor 8 in the secondary pump loop is P > P0, reduce the operating frequency and / or the number of units of the hot water secondary pump 7. Consequently, the monitored value P of the remote pressure difference sensor 8 in the secondary pump loop decreases, such that P = P0 (e.g., 10 kPa).

[0037] When the monitored pressure difference P of the remote pressure difference sensor 8 in the secondary pump loop is P = P0, maintain the operating frequency and / or the number of units of the hot water secondary pump 7 unchanged to keep the monitored value P of the remote pressure difference sensor 8 in the secondary pump loop unchanged, maintaining P = P0 (e.g., 10 kPa).

[0038] When the monitored pressure difference P of the remote pressure difference sensor 8 in the secondary pump loop is P < P0, increase the operating frequency and / or the number of units of the hot water secondary pump 7. Consequently, the monitored value P of the remote pressure difference sensor 8 in the secondary pump loop increases, such that P = P0 (e.g., 10 kPa).

[0039] An air-conditioning hot water system provided in this embodiment separately sets mixing measures on the boiler heat source side (i.e., the heat source side primary pump loop) and the user side (i.e., the user side tertiary pump loop), forming a double mixing system with mixing at both ends of the heat source side and the user side. The conventional intermediate plate heat exchanger between the pressurized hot water boiler and the user side is cancelled, reducing the operating resistance of the entire air-conditioning hot water system, and significantly saving the operating energy consumption of the hot water primary pump 2 and the hot water tertiary pump 10. At the same time, because this system adopts the double mixing technical measure of setting mixing on both the boiler heat source side and the user side, it can achieve super-large temperature difference transportation (e.g., a temperature difference of more than 40°C can be achieved) in the secondary pump loop for transportation, greatly reducing the transportation energy consumption of the hot water secondary pump 7.

[0040] Optionally, as Figure 1 shown, the air-conditioning hot water system includes a plurality of heat source side primary pump loops connected in parallel. Using multiple hot water boilers 1 can increase the water flow rate and temperature.

[0041] Optionally, as Figure 1 shown, a plurality of hot water secondary pumps 7 connected in parallel are provided on the supply water pipeline 17 of the secondary pump loop. This can improve the transportation capacity and load regulation capacity of the supply water pipeline 17 of the secondary pump loop, as well as achieve standby and improve reliability.

[0042] Optionally, as Figure 1 shown, the air-conditioning hot water system includes a plurality of user side tertiary pump loops connected in parallel. Figure 1 Each user side tertiary pump loop in corresponds to a single building. An air-conditioning hot water system provided in this embodiment can be applied to a group of multi-single buildings. The air-conditioning hot water system can be called a direct supply type double mixing super-large temperature difference air-conditioning hot water system for multi-single building complexes.

[0043] Optionally, as Figure 1 As shown, when multiple primary pump loops on the heat source side are connected in parallel, an electric switch valve 5 is provided on the return water pipeline 16 of the primary pump loop, and an interlock start-stop control is provided between the electric switch valve 5 and the hot water boiler 1. The hot water primary pump 2 and the hot water boiler 1 are interlocked for start-stop. When the hot water primary pump 2 is running, it always runs at power frequency to ensure a constant flow rate of the hot water boiler 1. When multiple hot water boilers 1 are connected in parallel, electric switch valves 5 are provided on the return water pipes of each hot water boiler 1. The electric switch valve 5 can be an electric butterfly valve. When the hot water boiler 1 stops running, the hot water primary pump 2 and the electric switch valve 5 are联动关闭 (linked to close), so as to ensure that the branch loop of the closed hot water boiler is also closed.

[0044] Optionally, as Figure 1 shown, each user-side tertiary pump loop includes a differential pressure sensor 9 for the most unfavorable loop on the user side; the differential pressure sensor 9 for the most unfavorable loop on the user side is arranged at the most unfavorable end of the user-side tertiary pump loop, between the supply water pipeline and the return water pipeline at the most unfavorable end (i.e., between the ends of the supply water pipeline 19 and the return water pipeline 20 of the tertiary pump loop). According to the monitoring value of the differential pressure sensor 9 for the most unfavorable loop on the user side, the operating frequency and / or the number of units of the hot water tertiary pump 10 can be controlled in real time.

[0045] The hot water tertiary pump 10 adjusts the frequency conversion and / or the number of units according to the monitoring value P of the differential pressure sensor 9 for the most unfavorable loop on the user side and the set value P0, to ensure that the differential pressure sensor 9 for the most unfavorable loop on the user side reaches the set value (such as 70 kPa);

[0046] When the detected value P of the differential pressure sensor 9 for the most unfavorable loop on the user side > P0, reduce the operating frequency and / or the number of units of the hot water tertiary pump 10, and then the detected value P of the differential pressure sensor 9 for the most unfavorable loop on the user side decreases, so that P = P0 (such as 70 kPa).

[0047] When the detected value P of the differential pressure sensor 9 for the most unfavorable loop on the user side = P0, maintain the operating frequency and / or the number of units of the hot water tertiary pump 10 unchanged, so as to maintain the detected value P of the differential pressure sensor 9 for the most unfavorable loop on the user side unchanged, so that P = P0 (such as 70 kPa).

[0048] When the detected value P of the differential pressure sensor 9 for the most unfavorable loop on the user side < P0, increase the operating frequency and / or the number of units of the hot water tertiary pump 10, and then the detected value P of the second differential pressure gauge 9 for the most unfavorable loop on the user side increases, so that P = P0 (such as 70 kPa).

[0049] Optionally, as Figure 1As shown, when there are multiple user-side tertiary pump loops, on the tertiary pump loop return pipe 20 close to the hot water secondary pump 7, a static balancing valve 14 is provided on the connecting pipe between the tertiary pump loop return pipe 20 and the secondary pump loop return pipe 18, which is used to eliminate the redundant pressure head of the hot water secondary pump 7 and make the electric regulating valve 13 in a suitable pressure difference adjustment range. The preset threshold value can be determined according to the redundant pressure head of the hot water secondary pump 7. The larger the redundant pressure head of the hot water secondary pump 7, the more redundant pressure head needs to be eliminated by the static balancing valve 14.

[0050] Optional, such as Figure 1 As shown, the three-stage pump loop water supply pipeline 19 includes a plurality of the hot water three-stage pumps 10 connected in parallel. This can improve the delivery capacity and load regulation capacity of the three-stage pump loop water supply pipeline 19, as well as achieve standby and improve reliability.

[0051] Optional, such as Figure 1 As shown, the temperature detection point of the boiler return water temperature sensor 3 is located at the input end of the hot water primary pump 2. In this way, the temperature detection point of the boiler return water temperature sensor 3 can detect the water temperature entering the hot water boiler 1 in real time. In other embodiments, the temperature detection point of the first temperature sensor 3 can be located at the output end of the hot water primary pump 2.

[0052] To sum up, the present invention provides an air-conditioning hot water system, in which water mixing measures are respectively arranged on the boiler heat source side and the user side, thereby forming a double water mixing system in which water mixing measures are arranged on both the heat source side and the user side, eliminating the conventional pressurized hot water boiler and the intermediate plate exchanger on the user side, reducing the operating resistance of the entire air-conditioning hot water system, and greatly saving the operating energy consumption of the hot water primary pump 2 and the hot water tertiary pump 10; at the same time, because the system adopts the double water mixing technical measures in which water mixing is arranged on both the boiler heat source side and the user side, it can realize the use of ultra-large temperature difference transportation for the secondary pump loop for transportation (such as temperature difference transportation of more than 40°C), which can greatly reduce the transportation energy consumption of the hot water secondary pump 7.

[0053] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. An air conditioning hot water system, characterized in that: It includes a primary pump loop on the heat source side, a secondary pump loop for delivery, and a tertiary pump loop on the user side; The heat source side primary pump loop includes a hot water boiler, a hot water primary pump, a boiler return water temperature sensor, an electric three-way valve, a primary pump loop water supply pipeline and a primary pump loop return pipeline; The secondary pump loop for delivery includes a hot water secondary pump, a secondary pump loop remote pressure differential sensor, a secondary pump loop water supply pipeline and a secondary pump loop return pipeline; The user-side three-stage pump loop includes a hot water three-stage pump, a user water supply temperature sensor, a terminal air conditioning device and an electric regulating valve, a user-side adverse loop pressure difference sensor, a three-stage pump loop water supply pipeline and a three-stage pump loop return pipeline; The hot water boiler comprises a water inlet and a water outlet, one end of the primary pump loop return pipe is connected to the water inlet of the hot water boiler, and the other end is connected to the secondary pump loop return pipe; one end of the primary pump loop water supply pipe is connected to the water outlet of the hot water boiler, and the other end is connected to the secondary pump loop water supply pipe; the hot water primary pump and the boiler return water temperature sensor are both installed on the primary pump loop return pipe and are located at the rear side of the bypass branch of the electric three-way valve; the electric three-way valve comprises a first port, a second port and a third port, the first port is connected to the water supply pipe of the hot water boiler, the second port is connected to the water pump suction side of the secondary pump loop water supply pipe, and the third port is connected to the primary pump loop return pipe; A temperature adjustment measure is provided between the boiler return water temperature sensor and the electric three-way valve, the boiler return water temperature sensor is used to detect the water temperature entering the hot water boiler, and control the opening of the third port of the electric three-way valve according to the detected water temperature; The outlet side of the hot water secondary pump is transported to each unit through the secondary pump loop water supply pipeline, and the suction side of the hot water tertiary pump is connected to the secondary pump loop water supply pipeline; the secondary pump loop far-end differential pressure sensor is arranged between the supply and return water pipes of the unit farthest from the hot water secondary pump; the water pump suction side of the secondary pump loop water supply pipeline and the secondary pump loop return water pipe are connected through a heat source side balance pipe; In each monomer, the water supply of the hot water three-stage pump is transported to each air-conditioning equipment through the three-stage pump loop water supply pipeline, and the water inlet of each air-conditioning equipment is connected to the three-stage pump loop water supply pipeline; the three-stage pump loop water supply pipeline and the three-stage pump loop return pipeline are connected through the user-side balancing pipe; the three-stage pump loop return pipeline is connected to the two-stage pump loop return pipeline and the electric regulating valve is arranged; the user water supply temperature sensor is installed on the three-stage pump loop water supply pipeline and is located at the rear side of the user-side balancing pipe; a temperature control regulation measure is arranged between the user water supply temperature sensor and the electric regulating valve, and the user water supply temperature sensor is used to detect the water temperature entering the water inlet of the air-conditioning equipment, and control the opening of the electric regulating valve according to the detected water temperature; The air conditioning hot water system comprises a plurality of the heat source side primary pump loops connected in parallel; Each of the user-side three-stage pump loops includes a user-side unfavorable loop pressure difference sensor; the user-side unfavorable loop pressure difference sensor is arranged between the supply and return water pipelines at the most unfavorable end of the user-side three-stage pump loop.

2. An air conditioning hot water system according to claim 1, characterized in that: A plurality of hot water secondary pumps connected in parallel are arranged on the secondary pump loop water supply pipeline.

3. An air conditioning hot water system as claimed in claim 2, characterized in that: The air conditioning hot water system includes a plurality of user-side three-stage pump loops connected in parallel.

4. An air conditioning and hot water system as claimed in claim 3, characterized in that: When a plurality of the heat source side primary pump loops are connected in parallel, an electric switch valve is provided on the return water pipeline of the primary pump loop, and an interlocking start-stop control is provided between the electric switch valve and the hot water boiler.

5. An air conditioning and hot water system as claimed in claim 3, characterized in that: On the tertiary pump loop return water main pipe close to the hot water secondary pump, a static balancing valve is provided on the connecting pipeline between the tertiary pump loop return water main pipe and the secondary pump loop return water main pipe.

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