Energy-saving plate type heat exchanger unit

Abstract

The utility model discloses an energy-saving plate-type heat exchanger unit which comprises a plate-type heat exchanger, a frequency converter, a control cabinet and an outdoor temperature sensor. A cold water side inlet of the plate-type heat exchanger is communicated with a secondary water return pipeline. A first circulating pump and a second circulating pump are arranged on the secondary water return pipeline, the first circulating pump and the second circulating pump are connected in parallel, and the flow of the second circulating pump is half of that of the first circulating pump; a programmable timer is also arranged in the control cabinet; by arranging the first circulating pump and the second circulating pump in parallel, the frequency converter can control the first circulating pump and the second circulating pump to work alternately, and the flow of the second circulating pump is set to be half of the flow of the first circulating pump, so that electric energy loss caused by the fact that the circulating pumps are always in a full-load working state is avoided; and a programmable timer is arranged to adjust the working modes of the first circulating pump and the second circulating pump according to the heating time, so that the electric energy consumption is reduced while sufficient heating is ensured.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to an energy-saving plate heat exchanger unit. Background Technology

[0002] Typically, plate heat exchanger units use two pumps with identical operating parameters on the secondary side. During the heating season, one pump is usually in operation while the other is on standby. The pump in operation is usually selected based on full-load operating parameters. However, in the early and late stages of the heating season, when occupancy rates are low, and when the weather is sunny and the temperature is high, it would be more energy-intensive to continue using the pump at full load, consuming unnecessary electrical energy. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an energy-saving plate heat exchanger unit that can reduce power loss during the heating process and save energy costs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0005] An energy-saving plate heat exchanger unit includes a plate heat exchanger, a frequency converter, a control cabinet, and an outdoor temperature sensor. The hot water inlet of the plate heat exchanger is connected to the primary water supply pipeline, the hot water outlet of the plate heat exchanger is connected to the secondary water supply pipeline, the cold water inlet of the plate heat exchanger is connected to the secondary return water pipeline, and the cold water outlet of the plate heat exchanger is connected to the primary return water pipeline. The control cabinet contains a PLC controller, the output of which is connected to the controlled end of the frequency converter, and the output of the outdoor temperature sensor is connected to the input of the PLC controller. The secondary return water pipeline contains a first circulation pump and a second circulation pump, which are connected in parallel, with the flow rate of the second circulation pump being half that of the first circulation pump. The controlled ends of the first and second circulation pumps are respectively connected to the output of the PLC controller. The control cabinet also contains a programmable timer that adjusts the operating modes of the first and second circulation pumps to save energy based on three time periods: the initial heating period, the middle heating period, and the final heating period. The output of the programmable timer is connected to the input of the PLC controller.

[0006] In the aforementioned energy-saving plate heat exchanger unit, a first ball valve, a first Y-type filter, and a first butterfly valve are sequentially arranged along the water inlet direction on the primary water supply pipeline. The controlled ends of the first ball valve, the first Y-type filter, and the first butterfly valve are respectively connected to the output end of the PLC controller.

[0007] In the aforementioned energy-saving plate heat exchanger unit, a second butterfly valve, a solenoid regulating valve, and a third ball valve are sequentially arranged along the outlet direction on the primary return water pipeline. The controlled ends of the second butterfly valve, the solenoid regulating valve, and the third ball valve are respectively connected to the output end of the PLC controller.

[0008] In the aforementioned energy-saving plate heat exchanger unit, the primary water supply pipeline and the primary return water pipeline are connected through a first circulating cleaning pipeline. A second ball valve is installed on the first circulating cleaning pipeline, and the controlled end of the second ball valve is connected to the output end of the PLC controller.

[0009] In the aforementioned energy-saving plate heat exchanger unit, the secondary return water pipeline is sequentially equipped with a fourth ball valve, a second Y-type filter, a pressure sensor, a solenoid valve, a safety valve, and a fourth butterfly valve along the water inlet direction. The controlled terminals of the fourth ball valve, the second Y-type filter, the solenoid valve, the safety valve, and the fourth butterfly valve are respectively connected to the output terminal of the PLC controller. The pressure sensor is located near the inlet of the first and second circulating pumps, and the controlled terminal of the pressure sensor is connected to the input terminal of the PLC controller.

[0010] In the aforementioned energy-saving plate heat exchanger unit, a fifth butterfly valve, a temperature sensor, and a sixth ball valve are sequentially arranged along the water outlet direction on the secondary water supply pipeline. The controlled ends of the fifth butterfly valve and the sixth ball valve are respectively connected to the output end of the PLC controller, and the output end of the temperature sensor is connected to the input end of the PLC controller.

[0011] In the aforementioned energy-saving plate heat exchanger unit, the secondary water supply pipeline and the secondary return water pipeline are connected through a second circulation cleaning pipeline. A fifth ball valve is installed on the second circulation cleaning pipeline, and the controlled end of the fifth ball valve is connected to the output end of the PLC controller.

[0012] In the aforementioned energy-saving plate heat exchanger unit, the secondary return water pipeline is also connected to the makeup water pipeline, and a makeup water pump is installed on the makeup water pipeline. The controlled end of the makeup water pump is connected to the output end of the PLC controller.

[0013] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0014] This utility model provides an energy-saving plate heat exchanger unit. By setting a first circulating pump and a second circulating pump in parallel, the frequency converter can control the first and second circulating pumps to work alternately. The flow rate of the second circulating pump is set to half of the flow rate of the first circulating pump to avoid the circulating pump always working at full load, which would cause a large amount of power loss. Furthermore, by setting a programmable timer to set three time periods according to the initial heating period, the middle heating period, and the end heating period, the working mode of the first and second circulating pumps can be adjusted. This ensures that the first circulating pump works during the middle heating period to guarantee heating efficiency, while the second circulating pump works during the initial and end heating periods, ensuring sufficient heating while reducing power consumption. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the specific structure of this utility model.

[0016] The components are: 1. Plate heat exchanger, 2. First ball valve, 3. First Y-type filter, 4. Primary water supply pipeline, 5. First butterfly valve, 6. Second butterfly valve, 7. Second ball valve, 8. Primary return water pipeline, 9. Third ball valve, 10. Fourth ball valve, 11. Second Y-type filter, 12. Secondary return water pipeline, 13. First circulation pump, 14. Second circulation pump, 15. Fifth ball valve, 16. Fourth butterfly valve, 17. Fifth butterfly valve, 18. Secondary water supply pipeline, 19. Sixth ball valve, 20. Pressure sensor, 21. Temperature sensor, 22. Frequency converter, 23. Makeup water pipeline, 24. Control cabinet, 25. Outdoor temperature sensor. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] An energy-saving plate heat exchanger unit, such as Figure 1 As shown, the system includes a plate heat exchanger 1, a frequency converter 22, a control cabinet 24, and an outdoor temperature sensor 25. The hot water inlet of the plate heat exchanger 1 is connected to the primary water supply pipeline 4, the hot water outlet of the plate heat exchanger 1 is connected to the secondary water supply pipeline 18, the cold water inlet of the plate heat exchanger 1 is connected to the secondary return water pipeline 12, and the cold water outlet of the plate heat exchanger 1 is connected to the primary return water pipeline 8.

[0019] The control cabinet 24 is equipped with a PLC controller. The output of the PLC controller is connected to the controlled end of the frequency converter 22. The frequency converter 22 has frequency conversion control function and can switch the operating frequency and operating mode of the circulating pump.

[0020] The output of the outdoor temperature sensor 25 is connected to the input of the PLC controller. The outdoor temperature sensor 25 is mainly used to detect the outdoor temperature in order to adjust the water supply mode.

[0021] The secondary return water pipeline 12 is also connected to the water supply pipeline 23, which is equipped with a water supply pump. The controlled end of the water supply pump is connected to the output end of the PLC controller.

[0022] A first ball valve 2, a first Y-type filter 3, and a first butterfly valve 5 are sequentially installed along the water inlet direction on the primary water supply pipeline 4. The controlled ends of the first ball valve 2, the first Y-type filter 3, and the first butterfly valve 5 are respectively connected to the output end of the PLC controller.

[0023] A second butterfly valve 6, a solenoid regulating valve, and a third ball valve 9 are sequentially installed along the water outlet direction on the primary return water pipeline 8. The controlled ends of the second butterfly valve 6, the solenoid regulating valve, and the third ball valve 9 are respectively connected to the output end of the PLC controller.

[0024] The primary water supply pipeline 4 and the primary return water pipeline 8 are connected by a first circulation cleaning pipeline to facilitate cleaning of the primary side pipeline network. A second ball valve 7 is installed on the first circulation cleaning pipeline, and the controlled end of the second ball valve 7 is connected to the output end of the PLC controller.

[0025] The secondary return water pipeline 12 is sequentially equipped with a fourth ball valve 10, a second Y-type filter 11, a pressure sensor 20, a solenoid valve, a safety valve, a first circulation pump 13, a second circulation pump 14, and a fourth butterfly valve 16 along the water inlet direction. The controlled terminals of the fourth ball valve 10, the second Y-type filter 11, the solenoid valve, the safety valve, and the fourth butterfly valve 16 are respectively connected to the output terminal of the PLC controller.

[0026] The pressure sensor 20 is located near the inlet of the first circulating pump 13 and the second circulating pump 14. The controlled end of the pressure sensor 20 is connected to the input end of the PLC controller and is used to detect the pressure value at the inlet of the circulating pump.

[0027] When the pressure sensor 20 detects that the pressure value at the inlet of the circulating pump is lower than the set pressure value, the PLC controller controls the water replenishment pump to work, and replenishes softened water to the secondary return water pipeline 12 through the water replenishment pipeline 23. When the pressure value at the inlet of the circulating water pump reaches the set pressure value, the water replenishment pump is controlled to stop running.

[0028] When the inlet pressure of the circulating water pump is higher than the set pressure, the PLC controller controls the solenoid valve to open and release pressure. When the opening of the solenoid valve is insufficient to meet the pressure release requirements, the safety valve automatically opens to release pressure, thereby realizing the safety protection function of the unit.

[0029] The first circulating pump 13 and the second circulating pump 14 are connected in parallel, and the flow rate of the second circulating pump 14 is half of the flow rate of the first circulating pump 13. The controlled terminals of the first circulating pump 13 and the second circulating pump 14 are respectively connected to the output terminals of the PLC controller.

[0030] The control cabinet 24 is also equipped with a programmable timer. The output of the programmable timer is connected to the input of the PLC controller. The programmable timer is set to three time periods: the beginning of the heating season, the middle of the heating season, and the end of the heating season. Different circulating pumps work according to each time period to reduce the power consumption during the heating process.

[0031] During the middle of the heating season, the first circulation pump 13 is activated to ensure heating efficiency. During the beginning and end of the heating season, the second circulation pump 14 is activated to ensure heating while reducing energy consumption.

[0032] The secondary water supply pipeline 18 is equipped with a fifth butterfly valve 17, a temperature sensor 21, and a sixth ball valve 19 in sequence along the water outlet direction. The controlled ends of the fifth butterfly valve 17 and the sixth ball valve 19 are respectively connected to the output end of the PLC controller.

[0033] The output of temperature sensor 21 is connected to the input of PLC controller, which can detect the water supply temperature in secondary water supply pipeline 18.

[0034] When the temperature sensor 21 on the secondary water supply pipeline detects that the temperature value is lower than the set value, the PLC controller controls the electric regulating valve on the primary return water pipeline to increase the opening degree so that the secondary water supply temperature of the unit reaches the set value; conversely, it controls the electric regulating valve to decrease the opening degree so that the secondary water supply temperature of the unit reaches the set value.

[0035] The secondary water supply pipeline 18 and the secondary return water pipeline 12 are connected by a second circulation cleaning pipeline to facilitate cleaning of the secondary side pipeline network. A fifth ball valve 15 is installed on the second circulation cleaning pipeline, and the controlled end of the fifth ball valve 15 is connected to the output end of the PLC controller.

[0036] In use, the primary water supply of the municipal heating network enters the primary water supply pipeline 4 through the first ball valve 2, and then passes through the first Y-type filter 3 to filter out large particulate impurities entering the pipeline. Then, it enters the plate heat exchanger 1 through the first butterfly valve 5 to heat the low-temperature water of the secondary network. After heat exchange, the primary return water returns to the primary return water of the municipal heating network through the second butterfly valve 6, the electric regulating valve, and the third ball valve 9.

[0037] Low-temperature water from the secondary network returning from the heat users enters the secondary return water pipeline 12 through the fourth ball valve 10, and then passes through the second Y-type filter 11 to filter out larger impurities. The return water is then pressurized by the first circulation pump 13 or the second circulation pump 14 to overcome the resistance of the secondary network. Then, it enters the plate heat exchanger 1 through the fourth butterfly valve 16. After being heated by the plate heat exchanger 1, the water is then supplied to the heat users through the fifth butterfly valve 17 and the sixth ball valve 19.

[0038] When flushing of the primary side pipeline is required at the beginning of the heating season, close the first butterfly valve 5 and the second butterfly valve 6, and open the second ball valve 7 to form a circulating cleaning pipeline consisting of the primary water supply pipeline 4, the first circulating cleaning pipeline, and the primary return water pipeline 8 for cleaning.

[0039] When flushing of the primary side pipeline is required at the beginning of the heating season, close the fourth butterfly valve 16 and the fifth butterfly valve 17, and open the fifth ball valve 15 to form a circulating cleaning pipeline consisting of the secondary return water pipeline 12, the second circulating cleaning pipeline, and the secondary supply water pipeline 18 for cleaning.

[0040] This utility model provides an energy-saving plate heat exchanger unit. By setting a first circulating pump and a second circulating pump in parallel, the frequency converter can control the first and second circulating pumps to work alternately. The flow rate of the second circulating pump is set to half of the flow rate of the first circulating pump to avoid the circulating pumps always working at full load, which would cause a large amount of power loss. Furthermore, by setting a programmable timer to set three time periods according to the initial heating period, the middle heating period, and the end heating period, the working mode of the first circulating pump 13 and the second circulating pump 14 can be adjusted. The first circulating pump 13 works during the middle heating period to ensure heating efficiency, while the second circulating pump 14 works during the initial and end heating periods, which can reduce power consumption while ensuring sufficient heating.

Claims

1. An energy-saving plate heat exchanger unit, characterized in that: The system includes a plate heat exchanger (1), a frequency converter (22), a control cabinet (24), and an outdoor temperature sensor (25). The hot water inlet of the plate heat exchanger (1) is connected to the primary water supply pipeline (4), the hot water outlet of the plate heat exchanger (1) is connected to the secondary water supply pipeline (18), the cold water inlet of the plate heat exchanger (1) is connected to the secondary return water pipeline (12), and the cold water outlet of the plate heat exchanger (1) is connected to the primary return water pipeline (8). The control cabinet (24) is equipped with a PLC controller. The output of the PLC controller is connected to the controlled end of the frequency converter (22), and the output of the outdoor temperature sensor (25) is connected to the input of the PLC controller. A first circulation pump (13) and a second circulation pump (14) are installed on the water pipe (12). The first circulation pump (13) and the second circulation pump (14) are connected in parallel, and the flow rate of the second circulation pump (14) is half of the flow rate of the first circulation pump (13). The controlled ends of the first circulation pump (13) and the second circulation pump (14) are respectively connected to the output end of the PLC controller. The control cabinet (24) is also equipped with a programmable timer that is set to three time periods according to the initial heating period, the middle heating period and the end heating period to adjust the working mode of the first circulation pump (13) and the second circulation pump (14) for energy saving. The output end of the programmable timer is connected to the input end of the PLC controller.

2. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The primary water supply pipeline (4) is provided with a first ball valve (2), a first Y-type filter (3), and a first butterfly valve (5) in sequence along the water inlet direction. The controlled ends of the first ball valve (2), the first Y-type filter (3), and the first butterfly valve (5) are respectively connected to the output end of the PLC controller.

3. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The primary return water pipeline (8) is provided with a second butterfly valve (6), a solenoid regulating valve, and a third ball valve (9) in sequence along the water outlet direction. The controlled ends of the second butterfly valve (6), the solenoid regulating valve, and the third ball valve (9) are respectively connected to the output end of the PLC controller.

4. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The primary water supply pipeline (4) and the primary return water pipeline (8) are connected by a first circulating cleaning pipeline. A second ball valve (7) is installed on the first circulating cleaning pipeline, and the controlled end of the second ball valve (7) is connected to the output end of the PLC controller.

5. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The secondary return water pipeline (12) is sequentially equipped with a fourth ball valve (10), a second Y-type filter (11), a pressure sensor (20), a solenoid valve, a safety valve, and a fourth butterfly valve (16) along the water inlet direction. The controlled ends of the fourth ball valve (10), the second Y-type filter (11), the solenoid valve, the safety valve, and the fourth butterfly valve (16) are respectively connected to the output end of the PLC controller. The pressure sensor (20) is located near the inlet of the first circulation pump (13) and the second circulation pump (14), and the controlled end of the pressure sensor (20) is connected to the input end of the PLC controller.

6. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The secondary water supply pipeline (18) is provided with a fifth butterfly valve (17), a temperature sensor (21), and a sixth ball valve (19) in sequence along the water outlet direction. The controlled ends of the fifth butterfly valve (17) and the sixth ball valve (19) are respectively connected to the output end of the PLC controller, and the output end of the temperature sensor (21) is connected to the input end of the PLC controller.

7. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The secondary water supply pipeline (18) and the secondary return water pipeline (12) are connected by a second circulation cleaning pipeline. A fifth ball valve (15) is installed on the second circulation cleaning pipeline. The controlled end of the fifth ball valve (15) is connected to the output end of the PLC controller.

8. The energy-saving plate heat exchanger unit according to claim 1, characterized in that: The secondary return water pipeline (12) is also connected to the water supply pipeline (23), and a water supply pump is installed on the water supply pipeline (23). The controlled end of the water supply pump is connected to the output end of the PLC controller.

Images