Novel domestic hot water unit

Abstract

The utility model discloses a novel domestic hot water unit which comprises a tubular heat exchanger, one side of the tubular heat exchanger is connected with a primary heat source inlet pipe network and a primary heat source outlet pipe network, the other side of the tubular heat exchanger is connected with a secondary water return pipe network and a secondary water supply pipe network, and the primary heat source outlet pipe network is connected to a municipal hot water return pipe network; an inlet ball valve and a Y-shaped filter are arranged on the primary heat source inlet pipe network; an electric control valve, a locking valve, a first heat meter and an outlet ball valve are arranged on the primary heat source outlet pipe network; a third electric ball valve, a second Y-shaped filter and a circulating water pump are arranged on the secondary water return pipe network; a second heat meter and a first electric ball valve are arranged on the secondary water supply pipe network; the hot water unit further comprises a control cabinet, and a PLC is arranged in the control cabinet. The secondary water return pipe network is connected with a water supplementing pipe network, and a remote water meter and a water supplementing pump are arranged on the water supplementing pipe network. The tubular heat exchanger is adopted, the heat transfer effect is good, and the occupied area is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, and more specifically to a novel domestic hot water unit. Background Art

[0002] With the development of society, land resources are becoming increasingly scarce. How to provide users with high-quality heating in the smallest space is a topic that needs to be studied.

[0003] Currently, many heat exchange stations have limited space, and traditional domestic water units have the following difficulties in use: 1) Traditional domestic water units are in the form of plate heat exchangers + water storage tanks and volumetric heat exchangers, but both types of domestic water units require larger tanks to balance the water supply temperature, occupying a larger space in the heat exchange station; 2) During peak water consumption periods, the water supply temperature may not meet the standard and may fluctuate; 3) The scaling problem of the heat exchanger is relatively serious. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a novel domestic hot water unit with a compact structure, reduced floor space and improved heat transfer effect.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] A new type of domestic hot water unit includes a tubular heat exchanger, one side of the tubular heat exchanger is connected to a primary heat source inlet pipe network and a primary heat source outlet pipe network, the other side of the tubular heat exchanger is connected to a secondary return pipe network and a secondary water supply pipe network, and the primary heat source outlet pipe network is connected to the municipal hot water return pipe network; the primary heat source inlet pipe network is provided with an inlet ball valve and a Y-type filter, the primary heat source outlet pipe network is provided with an electric regulating valve, a locking valve, a first heat meter and an outlet ball valve; the secondary return pipe network is provided with a third electric ball valve, a second Y-type filter and a circulating water pump, and the secondary water supply pipe network is provided with a second heat meter and a first electric ball valve; The hot water unit also includes a control cabinet arranged in the heat exchange station, which is equipped with a PLC controller. A temperature sensor for collecting outdoor temperature information is arranged outside the heat exchange station. The output ends of the temperature sensor, the first heat meter and the second heat meter are respectively connected to the input end of the PLC controller, and the output end of the PLC controller is respectively connected to the input end of the electric regulating valve, the third electric ball valve and the first electric ball valve; the secondary return water network is connected to the water supply network, and the water supply network is equipped with a remote water meter and a water supply pump, the output end of the remote water meter is connected to the input end of the PLC controller, and the output end of the PLC controller is connected to the input end of the water supply pump.

[0007] To further optimize the technical solution, a second electric ball valve is provided between the secondary return water network and the secondary water supply network to ensure that the water temperature of the system is constant, and the input end of the second electric ball valve is connected to the output end of the PLC controller.

[0008] To further optimize the technical solution, a bypass filter for cleaning and removing dirt from the return water is further provided on the secondary return water network, and a magnetic rod for adsorbing and removing iron filings is provided inside the bypass filter.

[0009] To further optimize the technical solution, the secondary return water network is also provided with a pressure relief solenoid valve and a safety valve for relieving pressure on the secondary side network, and the input ends of the pressure relief valve and the safety valve are respectively connected to the output ends of the PLC controller.

[0010] To further optimize the technical solution, a circulating water pump frequency converter connected to the circulating water pump for adjusting the speed of the circulating water pump is provided in the control cabinet, and the input end of the circulating water pump frequency converter is connected to the output end of the PLC controller.

[0011] To further optimize the technical solution, a water supply pump frequency converter connected to the water supply pump for adjusting the speed of the water supply pump is provided in the control cabinet, and the input end of the water supply pump frequency converter is connected to the output end of the PLC controller.

[0012] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is as follows.

[0013] The utility model provides a new type of domestic hot water unit, which adopts a tubular heat exchanger with good heat transfer effect and compact structure, greatly reducing the floor space and being able to ensure hot water supply during peak water usage. The unit is equipped with a fully automatic intelligent control system, realizing comprehensive unmanned control of heat usage, regulation, alarm, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Among them: 1. Inlet ball valve, 2. First Y-type filter, 3. Tubular heat exchanger, 4. Electric control valve, 5. Lock valve, 6. First heat meter, 7. Outlet ball valve, 8. Second heat meter, 9. First electric ball valve, 10. Second electric ball valve, 11. Third electric ball valve, 12. Second Y-type filter, 13. Bypass filter, 14. Pressure relief solenoid valve, 15. Safety valve, 16. Metal flexible connector, 17. Circulating water pump, 18. Remote water meter, 19. Make-up water pump, 20. Temperature sensor, 21. Make-up water pump inverter, 22. Circulating water pump inverter, 23. Control cabinet. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] A new type of domestic hot water unit, combined with Figure 1 As shown, the system includes a tubular heat exchanger 3 and a control cabinet 23. One side of the tubular heat exchanger 3 is connected to the primary heat source inlet and outlet networks. The other side of the tubular heat exchanger 3 is connected to the secondary return and secondary water supply networks. The primary heat source outlet network is connected to the municipal hot water return network. The control cabinet 23 is located within the heat exchange station and contains a PLC controller for intelligent heat exchange control.

[0018] An inlet ball valve 1 and a first Y-type filter 2 are provided on the primary heat source inlet pipe network. The inlet ball valve 1 is used to open and close the heat source water inlet, and the first Y-type filter 2 is used to filter impurities in the heat source water. An electric regulating valve 4, a locking valve 5, a first heat meter 6 and an outlet ball valve 7 are provided on the primary heat source outlet pipe network. The electric regulating valve 4 is used to adjust the heat source water flow rate, the locking valve 5 and the first heat meter 6 are used to realize heating charging according to heat, and the outlet ball valve 7 is used to open and close the heat source water outlet. The output end of the first heat meter is connected to the input end of the PLC controller, and the output end of the PLC controller is connected to the input end of the electric regulating valve.

[0019] The primary heat source enters the new domestic hot water unit through the inlet pipe network, passes through the inlet ball valve 1, the first Y-type filter 2, and enters the core coiled heat exchanger 3 for heat exchange. After the hot water is cooled in the heat exchanger, it passes through the electric regulating valve 4, the lock valve 5, the first heat meter 6 and the outlet ball valve 7, flows out of the hot side pipe of the unit, and returns to the municipal hot water return pipe network.

[0020] A temperature sensor 20 is provided outside the heat exchange station to collect the outdoor temperature. The output end of the temperature sensor is connected to the input end of the PLC controller. The PLC controller can control the opening of the electric regulating valve 4 according to the outdoor temperature measured by the temperature sensor 20, perform temperature regulator compensation, and thus ensure that the secondary water supply temperature of the system is constant.

[0021] A third electric ball valve 11, a second Y-type filter 12 and a circulating water pump 17 are provided on the secondary return water network, a second heat meter 8 and a first electric ball valve 9 are provided on the secondary water supply network, and the circulating water pump 17 is provided on the secondary return water network through a metal soft connection 16. The output end of the second heat meter 8 is connected to the input end of the PLC controller, and the output end of the PLC controller is respectively connected to the input ends of the third electric ball valve 11 and the first electric ball valve 9.

[0022] The return water from the secondary network passes through the third electric ball valve 11, the second Y-type filter 12, the metal flexible connection 16, and the circulating water pump 17 before entering the coiled heat exchanger 3 to be heated. It then enters the secondary water supply pipe and passes through the second heat meter 8 and the first electric ball valve 9 to be supplied to users for domestic hot water.

[0023] A second electric ball valve 10 is arranged between the secondary return network and the secondary water supply network. The input end of the second electric ball valve is connected to the output end of the PLC controller. When the secondary network is operating normally, the first electric ball valve 9 and the third electric ball valve 11 are opened, and the second electric ball valve 10 is closed. When the user end does not need heat, the first electric ball valve 9 and the third electric ball valve 11 are closed, and the second electric ball valve 10 is opened. The circulating water pump 17 operates at a low frequency to ensure that the water temperature in the system is constant, avoid local excessive temperature, and reduce the risk of scaling of the heat exchanger.

[0024] A bypass filter 13 is also installed on the secondary return pipe network to clean the return water. A magnetic rod is installed inside the bypass filter to absorb and remove iron filings. An electric valve is installed on the bypass filter 13. The input of the electric valve is connected to the output of the PLC controller, which automatically opens the electric valve to discharge sewage at a specified time.

[0025] The secondary return water network is also provided with a pressure relief solenoid valve 14 and a safety valve 15 for relieving the pressure of the secondary side network. The input ends of the pressure relief valve and the safety valve are respectively connected to the output ends of the PLC controller. The unit controller compares the measured value of the secondary return water side pressure signal with the set value. When it is higher than the set value, the output signal opens the solenoid valve and starts to relieve pressure. When the solenoid valve is working and the pressure still rises, when the pressure rises to the starting pressure of the safety valve, the safety valve opens and performs secondary pressure relief to ensure that the pressure of the secondary side network is not over-pressured and operates safely.

[0026] The secondary return water network is connected to a water supply network equipped with a remote water meter 18 and a water supply pump 19. The output of the remote water meter is connected to the input of a PLC controller, which in turn is connected to the input of the water supply pump. When domestic water is operating normally, the water supply system operates, and the water is pressurized by the remote water meter 18 and water supply pump 19 before entering the secondary return water system. The remote water meter allows for online and remote display of the water supply levels for each system.

[0027] Thermometers, pressure gauges and flow meters are respectively installed on the primary heat source inlet network, the primary heat source outlet network, the secondary return network and the secondary water supply network to collect the primary and secondary side temperature, pressure and flow information. The output ends of the thermometers, pressure gauges and flow meters are connected to the input ends of the PLC controller.

[0028] A circulating water pump inverter 22 is provided in the control cabinet 23. The input end of the circulating water pump inverter is connected to the output end of the PLC controller, and the output end of the circulating water pump inverter is connected to the input end of the circulating water pump. The PLC controller controls the frequency of the circulating water pump inverter according to the supply and return water pressure on the secondary side, adjusts the speed of the circulating water pump, and thus maintains a constant secondary water supply pressure to ensure water supply at the user end.

[0029] Control cabinet 23 houses a feed pump inverter 21. Its input is connected to the output of the PLC controller, while its output is connected to the input of the feed pump. By comparing the actual pressure measured by a pressure sensor installed on the secondary return line with the set secondary return pressure, the feed pump inverter controls the feed pump's speed or starts and stops, thereby maintaining relatively stable pressure within the system and achieving constant pressure.

[0030] Compared with traditional domestic water units, this new model has a small footprint, high heat transfer efficiency, constant heat exchange temperature, unique anti-scaling design, and can be switched automatically.

Claims

1. A new type of domestic hot water unit, characterized by: The invention comprises a tubular heat exchanger (3), one side of the tubular heat exchanger (3) is connected to a primary heat source inlet pipe network and a primary heat source outlet pipe network, the other side of the tubular heat exchanger (3) is connected to a secondary return pipe network and a secondary water supply pipe network, and the primary heat source outlet pipe network is connected to a municipal hot water return pipe network; the primary heat source inlet pipe network is provided with an inlet ball valve (1) and a first Y-type filter (2), the primary heat source outlet pipe network is provided with an electric regulating valve (4), a locking valve (5), a first heat meter (6) and an outlet ball valve (7); the secondary return pipe network is provided with a third electric ball valve (11), a second Y-type filter (12) and a circulating water pump (17), the secondary water supply pipe network is provided with a second heat meter (8) and a third electric regulating valve (4), a locking valve (5), a first heat meter (6) and an outlet ball valve (7); an electric ball valve (9); the water heater unit further comprises a control cabinet (23) arranged in the heat exchange station, a PLC controller is arranged in the control cabinet, a temperature sensor (20) for collecting outdoor temperature information is arranged outside the heat exchange station, the output ends of the temperature sensor, the first heat meter and the second heat meter are respectively connected to the input end of the PLC controller, the output end of the PLC controller is respectively connected to the input end of the electric regulating valve, the third electric ball valve and the first electric ball valve; the secondary return water network is connected to a water supply network, a remote water meter (18) and a water supply pump (19) are arranged on the water supply network, the output end of the remote water meter is connected to the input end of the PLC controller, and the output end of the PLC controller is connected to the input end of the water supply pump.

2. A novel domestic hot water unit according to claim 1, characterized in that: A second electric ball valve (10) is provided between the secondary water return pipe network and the secondary water supply pipe network for ensuring a constant water temperature in the system, and the input end of the second electric ball valve is connected to the output end of the PLC controller.

3. A novel domestic hot water unit according to claim 1, characterized in that: The secondary return water pipe network is also provided with a bypass filter (13) for cleaning and removing dirt from the return water, and a magnetic rod for adsorbing and removing iron filings is provided inside the bypass filter.

4. A novel domestic hot water unit according to claim 1, characterized in that: The secondary water return pipe network is also provided with a pressure relief solenoid valve (14) and a safety valve (15) for relieving pressure on the secondary side pipe network, and the input ends of the pressure relief valve and the safety valve are respectively connected to the output end of the PLC controller.

5. A novel domestic hot water unit according to claim 1, characterized in that: The control cabinet (23) is provided with a circulating water pump frequency converter (22) connected to the circulating water pump (17) for adjusting the speed of the circulating water pump. The input end of the circulating water pump frequency converter is connected to the output end of the PLC controller.

6. A novel domestic hot water unit according to claim 1, characterized in that: The control cabinet (23) is provided with a water supply pump frequency converter (21) connected to the water supply pump (19) for adjusting the speed of the water supply pump. The input end of the water supply pump frequency converter is connected to the output end of the PLC controller.

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