A PLC-based remote control control cabinet for heat exchange stations
By combining a PLC controller with a floating plate, counterweight, and stainless steel spring structure, the problems of false alarms and energy waste in traditional heat exchange station control cabinets are solved, realizing automated full-process management and improving the stability and efficiency of the heating system.
Patent Information
- Application Number
- CN202522500037.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-25
AI Technical Summary
Traditional heat exchange station control cabinets are susceptible to water flow impact and scale buildup, leading to false alarms and energy waste. Furthermore, the circulating pump and makeup water pump cannot be dynamically adjusted according to the supply and return water pressure difference and outdoor temperature, resulting in equipment damage and energy waste.
The system integrates liquid level, pressure, and temperature signals using a PLC controller, combined with a float, counterweight, and stainless steel spring structure to achieve automated control, avoiding false triggering and energy waste. By adjusting the pump frequency and temperature through frequency conversion, the system achieves fully automated management of the entire process.
Stable operation of the heat exchange station was achieved, avoiding equipment damage and energy waste, and improving the stability and efficiency of the heating system.
Smart Images
Figure CN224947831U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of control cabinet technology, specifically a control cabinet for a heat exchange station based on PLC remote control. Background Technology
[0002] The heat exchange station control cabinet is the core device for centralized control of the operation of heat exchange station equipment. Through automation technology, it realizes parameter monitoring, equipment adjustment, remote management and energy-saving control, ensuring the stability and efficiency of the heating system. In heating scenarios such as small and medium-sized residential communities and commercial buildings, the heat exchange station is the core hub for heat transfer, and its operational stability directly affects the heating quality at the user end.
[0003] Traditional heat exchange stations mostly use ordinary float switches, which are susceptible to water flow impact and scale buildup, leading to problems such as false alarms at low liquid levels and overflows at high liquid levels. This can cause pumps to burn out due to dry running or pipeline pressure imbalance. The control method is also crude. At the same time, the circulating pumps and makeup water pumps mostly operate at fixed speeds and cannot be dynamically adjusted according to the supply and return water pressure difference and outdoor temperature, resulting in energy waste. Therefore, it is necessary to propose a PLC-based remote control control cabinet for heat exchange stations. Utility Model Content
[0004] The purpose of this invention is to provide a PLC-based remote control control cabinet for heat exchange stations to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a PLC-based remote control heat exchange station control cabinet, comprising a water tank, a cabinet, a detection tube, a circulating pump, a makeup water pump, and a plate heat exchanger. The detection tube is provided on one side of the water tank, the cabinet and the plate heat exchanger are provided on one side of the water tank, the circulating pump and the makeup water pump are provided above the water tank, a display is fixedly connected to the outer wall of the cabinet, and a PLC controller is fixedly connected inside the display. The inner top wall of the detection tube has a hole and an I-shaped block is slidably connected thereto. The I-shaped block extends to the outside of the hole and is fixedly connected to a circular tube. A sliding plate is slidably connected to the inner wall of the circular tube. A first contact point is fixedly connected to the inner bottom wall of the circular tube. A second contact point matching the first contact point is fixedly connected to the lower surface of the sliding plate. A third contact point is fixedly connected to one end of the I-shaped block extending to the outside of the hole. A fourth contact point matching the third contact point is fixedly connected to the outer top wall of the detection tube. A float plate is slidably connected to the inner wall of the detection tube.
[0006] Preferably, a connecting rope is fixedly connected to the upper surface of the float plate, the connecting rope extends through a hole into the round tube and is fixedly connected to the slide plate, and a spring is fixedly connected to the inner bottom wall of the round tube, the other end of the spring being fixedly connected to the slide plate.
[0007] Preferably, a connecting pipe is fixedly connected to the inner bottom wall of the water tank, the connecting pipe extends into the detection pipe, the input end of the water replenishment pump is connected to the bottom of the water tank through a water pipe, and the input end of the circulation pump is connected to the plate heat exchanger through a water pipe.
[0008] Preferably, an observation window is fixedly connected to one side of the outer wall of the water tank, and a scale is provided on one side of the outer wall of the observation window.
[0009] Preferably, a counterweight is fixedly connected above the float.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: through the linkage structure of float plate, counterweight, stainless steel spring and waterproof contact, the counterweight stabilizes the attitude of float plate and avoids the float plate tilting due to water flow impact, the stainless steel spring provides buffer and prevents the switch from being accidentally triggered, and the PLC controller integrates multi-dimensional signal acquisition of liquid level, pressure and temperature, and automatically completes the whole process of low liquid level water replenishment, high liquid level shutdown, variable frequency speed regulation of circulating pump and plate heat exchanger temperature regulation without manual intervention. Attached Figure Description
[0011] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 This is a front view structural diagram of the detection tube of this utility model; Figure 3 This is a schematic cross-sectional view of the detection tube of this utility model; Figure 4 This is a schematic diagram of the sliding plate movement structure of this utility model; Figure 5 This is a schematic diagram of the circular tube moving structure of this utility model; Figure 6 This is a front view structural diagram of the cabinet of this utility model.
[0012] In the diagram: 1. Water tank; 2. Cabinet; 3. Detection tube; 4. Circulation pump; 5. Make-up water pump; 6. Display; 7. I-shaped block; 8. Round tube; 9. Slide plate; 10. First contact; 11. Second contact; 12. Third contact; 13. Fourth contact; 14. Float; 15. Connecting rope; 16. Spring; 17. Observation window; 18. Counterweight. Detailed Implementation
[0013] Please see Figure 1-6 This utility model provides a technical solution: Example 1: A PLC-based remote control heat exchange station control cabinet includes a water tank 1, a cabinet 2, a detection pipe 3, a circulating pump 4, a makeup water pump 5, and a plate heat exchanger. The detection pipe 3 is provided on one side of the water tank 1, the cabinet 2 and the plate heat exchanger are provided on one side of the water tank 1, the circulating pump 4 and the makeup water pump 5 are provided above the water tank 1, and a display 6 is fixedly connected to the outer wall of the cabinet 2. A PLC controller is fixedly connected inside the display 6. The inner top wall of the detection tube 3 has a hole and is slidably connected to an I-shaped block 7. The I-shaped block 7 extends to the outside of the hole and is fixedly connected to a circular tube 8. A sliding plate 9 is slidably connected to the inner wall of the circular tube 8. A first contact 10 is fixedly connected to the inner bottom wall of the circular tube 8. A second contact 11 matching the first contact 10 is fixedly connected to the lower surface of the sliding plate 9. A third contact 12 is fixedly connected to one end of the I-shaped block 7 extending to the outside of the hole. A fourth contact 13 matching the third contact 12 is fixedly connected to the outer top wall of the detection tube 3. A float plate 14 is slidably connected to the inner wall of the detection tube 3. A connecting rope 15 is fixedly connected to the upper surface of the float plate 14. The connecting rope 15 extends through the hole to... The round tube 8 is fixedly connected to the slide plate 9. The inner bottom wall of the round tube 8 is fixedly connected to the spring 16. The other end of the spring 16 is fixedly connected to the slide plate 9. The inner bottom wall of the water tank 1 is fixedly connected to the connecting pipe, which passes through the detection tube 3. The input end of the water replenishment pump 5 is connected to the bottom of the water tank 1 through a water pipe. The input end of the circulation pump 4 is connected to the plate heat exchanger through a water pipe. An observation window 17 is fixedly connected to one side of the outer wall of the water tank 1. A scale is provided on one side of the outer wall of the observation window 17. A counterweight 18 is fixedly connected above the float 14. The output end of the water replenishment pump 5 is connected to the secondary network return water pipeline through a water pipe. The output end of the circulation pump 4 is connected to the user end water supply pipeline. Water tank 1 is installed in the water supply area of the heat exchange station, and a shock-absorbing support is welded to the bottom. Cabinet 2 is installed in the dry and ventilated area next to water tank 1, and grounding bolts are fixed at the bottom of cabinet 2; The detection tube 3 is installed on the right side of the water tank 1. The bottom of the detection tube 3 is connected to the water tank 1 through a connecting pipe. The float 14 is placed inside the detection tube 3 and can slide freely up and down. The counterweight 18 is made of lead alloy and is fixed at the center of the upper surface of the float 14. It is connected by bolts to prevent it from falling off. The observation window 17 is made of double-layered tempered glass, installed in the center of the front of the water tank 1, sealed with waterproof sealant around the perimeter, and a scale is attached to the outside. The display 6 is a TPC1061Ti touch screen, installed on the side of cabinet 2, and connected to the PLC controller via Ethernet. The PLC controller is a Siemens S7-1214C, which integrates 16DI, 14DO, 8AI and 2AO, and is installed on the side wall of cabinet 2. The circulating pump 4 is a pipeline centrifugal pump, model ISG50-160, which is installed above the water tank 1 and connected to the pipeline through a rubber expansion joint. The makeup water pump 5 is a vertical pipeline pump, model GDL25-12, which is installed next to the circulating pump 4 and connected to the bottom of the water tank 1 through a water pipe. The plate heat exchanger is a brazed plate heat exchanger, model BR0.3-1.6, installed in the equipment area on the other side of cabinet 2, and connected to the secondary network supply and return water pipelines through flanges; ABB frequency converters: Circulation pump 4 is compatible with ACS510-01-04A1-4, and water supply pump 5 is compatible with ACS355-03E-01A2-4. They are installed on the upper part of cabinet 2 and connected to the PLC analog output module through shielded cables. The low-voltage components are Delixi CJX2-1210 contactor, CDW3-160 circuit breaker, and JZC-44 intermediate relay. They are installed on the electrical mounting plate in the middle of cabinet 2 and arranged in the order of "power supply → circuit breaker → contactor → frequency converter". The first contact 10, the second contact 11, the third contact 12 and the fourth contact 13 are waterproof micro switches, model KW12-3Z, which are connected to the PLCDI module via IP65 waterproof cables; Spring 16 is a stainless steel compression spring 16, installed between the inner bottom wall of the round tube 8 and the slide plate 9. In its natural state, it supports the slide plate 9, so that the second contact 11 is separated from the first contact 10. The connecting rope 15 is a stainless steel wire rope, which connects the upper surface of the float 14 and the lower surface of the slide plate 9, and its length is adapted to the height of the detection tube 3. The connecting pipe is made of stainless steel and is connected between the bottom wall of the water tank 1 and the bottom of the detection pipe 3. It is connected by a flange and the inner wall of the connecting pipe is equipped with a filter and a drain valve. The water supply pipeline fittings are DN32 check valves, which are installed between the output end of water supply pump 5 and the secondary network return water pipeline, arranged in the order of pump → filter → check valve → pipeline; The water system is connected as follows: the input end of the water supply pump 5 is connected to the outlet flange at the bottom of the water tank 1 via a water pipe; the output end of the water supply pump 5 is connected to the secondary network return water pipeline via a water pipe; the input end of the circulating pump 4 is connected to the secondary side outlet flange of the plate heat exchanger via a water pipe; the output end of the circulating pump 4 is connected to the user's water supply pipeline via an insulated water pipe; a pressure transmitter is installed on the pipeline, and the pressure transmitter is connected to the PLCAI module to collect the secondary water supply pressure; the inlet of the plate heat exchanger is connected to the municipal high-temperature heat source water supply pipeline, and the outlet is connected to the heat source return water pipeline; an electric three-way valve is installed on the primary side pipeline, model VQ40-16, and the opening degree of the electric three-way valve is controlled by the PLCDO module; a water supply port is opened at the top of the water tank 1 and connected to the external softened water system; the water supply port is equipped with an electric ball valve, which is controlled by the PLC to start and stop; a drain port is opened at the bottom of the water tank 1 and a gate valve is installed to periodically discharge sediment; an overflow pipe is also provided at the top of the water tank 1 and connected to the heat exchange station drainage system. In the electrical system connection, the signal lines of the first contact 10, the second contact 11, the third contact 12, and the fourth contact 13 are connected to the PLC digital input module through waterproof cables. The PLC digital output module drives the contactor coils of the water supply pump 5 and the circulation pump 4 through intermediate relays. The frequency converter is connected to the PLC analog output module. The secondary water supply and return pressure sensor, the plate heat exchanger water supply temperature sensor, and the outdoor temperature sensor are respectively connected to the PLC analog input module.
[0014] When in use, when the liquid level in the water tank 1 drops to a certain amount due to the loss of the secondary network, the float 14 drops synchronously with the drop in the liquid level in the detection tube 3. At this time, the connecting rope 15 pulls the slide plate 9 downward and compresses the spring 16. The first contact 10 and the second contact 11 close, and the PLC controller receives the low liquid level signal of the water tank 1. At this time, the PLC executes the logic to immediately shut down the circulating pump 4 to prevent the circulating pump 4 from running dry, and starts the water replenishment pump 5 to replenish water to the secondary network. At the same time, it controls the electric ball valve on the top of the water tank 1 to open, and external softened water is injected into the water tank 1. The display 6 shows a low liquid level water replenishment alarm. When the water level in tank 1 rises to the high level, the float plate 14 rises. At this time, the connecting rope 15 loosens, and the spring 16 drives the slide plate 9 to move upward. At this time, the first contact 10 and the second contact 11 separate, and the low water level alarm is released. When the float plate 14 moves to the upper end of the detection tube 3, the float plate 14 pushes the I-shaped block 7 to move upward, so that the third contact 12 and the fourth contact 13 separate. The PLC controller receives the high water level signal of tank 1. At this time, the PLC executes the logic, shuts down the water supply pump 5 and the electric ball valve of water tank 1, delays the start of the circulation pump 4, resets the alarm on the display 6, and restores the system to normal circulation. The counterweight 18 ensures the stability of the floating plate 14 and avoids the contact points from being accidentally triggered due to water flow fluctuations. After the circulating pump 4 starts, the PLC collects the secondary supply and return water pressure difference signal and adjusts the pump frequency of the circulating pump 4 through the ABB frequency converter to ensure smooth hot water circulation at the user end. The plate heat exchanger heats the secondary network cold water through the primary side high temperature water. The PLC controller collects the plate heat exchanger supply water temperature and the outdoor temperature and adjusts the opening of the primary side electric three-way valve according to the climate compensation logic so that the plate heat exchanger supply water temperature is dynamically adjusted with the outdoor temperature. When the makeup water pump 5 is running, the PLC controller monitors the secondary return water pressure at the same time. When the pressure rises to the set upper limit, even if the water tank 1 has not reached the high liquid level, the makeup water pump 5 will be shut down in advance to avoid overpressure in the pipeline network. If the secondary return water pressure is lower than a certain value, the PLC receives a pressure sensor signal and immediately shuts down the circulation pump 4. The display 6 shows an alarm indicating that the return water pressure is too low. If the secondary supply water pressure is higher than a certain value, the PLC controller triggers the circulation pump 4 to stop and simultaneously opens the pipeline pressure relief valve. The display 6 shows an alarm indicating that the supply water pressure is too high. If the water supply pump 5 runs continuously for a certain period of time but still fails to raise the water level in the water tank 1 above the low level, the PLC controller determines that there is a leak in the external pipeline, shuts down the water supply pump 5, issues an alarm, and requires manual reset.
Claims
1. A PLC-based remote control heat exchange station control cabinet, comprising a water tank (1), a cabinet (2), a detection tube (3), a circulating pump (4), a makeup water pump (5), and a plate heat exchanger, wherein the detection tube (3) is provided on one side of the water tank (1), the cabinet (2) and the plate heat exchanger are provided on one side of the water tank (1), the circulating pump (4) and the makeup water pump (5) are provided above the water tank (1), a display (6) is fixedly connected to the outer wall of the cabinet (2), and a PLC controller is fixedly connected inside the display (6); Its features are, The inner top wall of the detection tube (3) is provided with a hole and is slidably connected to an I-shaped block (7). The I-shaped block (7) extends to the outside of the hole and is fixedly connected to a round tube (8). The inner wall of the round tube (8) is slidably connected to a sliding plate (9). The inner bottom wall of the round tube (8) is fixedly connected to a first contact point (10). The lower surface of the sliding plate (9) is fixedly connected to a second contact point (11) that matches the first contact point (10). The end of the I-shaped block (7) extending to the outside of the hole is fixedly connected to a third contact point (12). The outer top wall of the detection tube (3) is fixedly connected to a fourth contact point (13) that matches the third contact point (12). The inner wall of the detection tube (3) is slidably connected to a float plate (14). The third contact point (12) and the fourth contact point (13) abut against each other.
2. The control cabinet for a heat exchange station based on PLC remote control according to claim 1, characterized in that: A connecting rope (15) is fixedly connected to the upper surface of the float (14). The connecting rope (15) extends through the hole into the round tube (8) and is fixedly connected to the slide plate (9). A spring (16) is fixedly connected to the inner bottom wall of the round tube (8). The other end of the spring (16) is fixedly connected to the slide plate (9).
3. The control cabinet for a heat exchange station based on PLC remote control according to claim 1, characterized in that: The inner bottom wall of the water tank (1) is fixedly connected to a connecting pipe, which extends into the detection pipe (3). The input end of the water replenishment pump (5) is connected to the bottom of the water tank (1) through a water pipe, and the input end of the circulation pump (4) is connected to the plate heat exchanger through a water pipe.
4. The PLC-based remote control heat exchange station control cabinet according to claim 1, characterized in that: An observation window (17) is fixedly connected to one side of the outer wall of the water tank (1), and a scale is provided on one side of the outer wall of the observation window (17).
5. A PLC-based remote control heat exchange station control cabinet according to claim 1, characterized in that: A counterweight (18) is fixedly connected above the float (14).