An air-source constant pressure device

Abstract

This utility model discloses an air-source constant pressure device, including a housing. Inside the housing are a water supply pump, an electromagnetic drain valve, a first pressure sensor, and a second pressure sensor. The outlet of the water supply pump is connected to a heating pipeline via a pipe, and the inlet of the electromagnetic drain valve is connected to the heating pipeline. The first and second pressure sensors are respectively connected to the heating pipeline and are used to detect the water pressure inside the pipeline and control the opening and closing of the water supply pump and the electromagnetic drain valve according to a preset pressure value. A heat recovery component is also installed inside the housing. This utility model achieves constant regulation of pipeline pressure through the linkage control of a PLC controller with a pressure gauge, the water supply pump, and the electromagnetic drain valve, overcoming the shortcomings of insufficient or excessive buffering capacity caused by the fixed capacity of an expansion tank. The heat recovery component effectively utilizes the energy of the depressurized hot water to preheat the water supply, reducing the main unit's energy consumption. While ensuring constant system pressure, it improves overall energy efficiency, safety, and reliability.

Description

Technical Field

[0001] This utility model relates to the field of air source heating technology, specifically to an air source constant pressure device. Background Technology

[0002] In the practical application of air source heat pump heating systems, after the system heats the water through the heat pump unit, the hot water needs to be circulated in the pipes to achieve heating. During this process, the circulating water in the pipes absorbs heat and its temperature rises. The water expands in volume after being heated, which directly causes a significant increase in the water pressure inside the pipes. To alleviate this water pressure rise problem, the commonly used solution in the existing technology is to install an expansion tank in the heating pipeline system. The expansion tank uses the preset air pressure or the buffering effect of the elastic element to temporarily store some of the excess water generated by the expansion, thereby offsetting the increase in water pressure in the pipes to a certain extent. However, existing water pressure control schemes based on a single expansion tank have significant technical defects, making it difficult to meet the requirements for long-term stable operation of air source heat pump heating systems. First, the buffering effect of the expansion tank depends on the precise matching of its volume with the total amount of water in the system and the range of temperature changes. In actual applications, the heating power of air source heat pump heating systems often fluctuates with ambient temperature and user demand, resulting in unstable water temperature changes in the pipes. If the expansion tank volume is fixed, it is easy to have insufficient or excessive buffering capacity, making it impossible to continuously maintain stable water pressure in the pipes. Second, when the water temperature in the pipes rises suddenly, causing the water expansion to exceed the maximum temporary storage capacity of the expansion tank, the water pressure in the pipes will quickly exceed the safety threshold. Existing solutions lack effective secondary pressure relief or emergency adjustment mechanisms, which can lead to pipe rupture, leakage due to seal failure at pipe joints, and other malfunctions. This can not only cause the heating system to shut down but also cause economic losses such as damage to indoor decorations and equipment corrosion due to leakage, seriously affecting the reliability and safety of the system. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides an air-source constant pressure device.

[0004] This utility model is achieved through the following technical solution: An air-source constant pressure device includes a housing. Inside the housing are a water supply pump, an electromagnetic drain valve, a first pressure sensor, and a second pressure sensor. The outlet of the water supply pump is connected to a heating pipe via a pipeline, and the inlet of the electromagnetic drain valve is connected to the heating pipe. The first and second pressure sensors are respectively connected to the heating pipe and are used to detect the water pressure inside the heating pipe and control the opening and closing of the water supply pump and the electromagnetic drain valve according to a preset pressure value. A heat recovery component is also provided inside the housing.

[0005] Further optionally, the heat recovery assembly includes a heat exchanger, the hot side channel of which is connected in series in the return water pipeline between the outlet of the electromagnetic drain valve and the external water tank, and the cold side channel of which is connected in series in the supply water pipeline between the external water tank and the inlet of the make-up water pump.

[0006] Further optionally, an automatic control system is also included, which includes a PLC controller located inside the housing. The PLC controller is electrically connected to the water supply pump, the electromagnetic drain valve, the first pressure sensor, and the second pressure sensor.

[0007] Alternatively, a check valve may be installed between the outlet of the water supply pump and the heating pipeline.

[0008] Further optionally, the first pressure sensor is configured to close under low pressure and open under high pressure, and the second pressure sensor is configured to close under high pressure and open under low pressure.

[0009] Alternatively, filters may be provided at the front ends of both the hot-side inlet and the cold-side inlet of the heat exchanger.

[0010] Alternatively, a plate heat exchanger may be used. Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model achieves active and precise closed-loop regulation of pipeline pressure through the linkage control of PLC controller, pressure gauge, water supply pump and electromagnetic drain valve, overcoming the defects of insufficient or excessive buffering capacity caused by fixed capacity of traditional expansion tanks; the heat recovery component effectively utilizes the energy of depressurized hot water to preheat water supply, significantly reducing the energy consumption of the main unit, and improving overall energy efficiency, safety and reliability while ensuring constant system pressure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the practical structure; In the diagram: 1. Housing; 2. Water pump; 3. Heat exchanger; 4. Electromagnetic drain valve; 5. First pressure sensor; 6. Second pressure sensor; 7. Heating pipe; 8. Return water pipe; 9. Water supply pipe; 10. PLC controller; 11. Check valve. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: like Figure 1As shown, an air-source constant pressure device includes a housing 1. Inside the housing 1 are a water supply pump 2, an electromagnetic drain valve 4, a first pressure sensor 5, and a second pressure sensor 6. The outlet of the water supply pump 2 is connected to a heating pipe 7 via a pipe, and the inlet of the electromagnetic drain valve 4 is connected to the heating pipe 7. The first pressure sensor 5 and the second pressure sensor 6 are respectively connected to the heating pipe 7 and are used to detect the water pressure inside the heating pipe 7 and control the opening and closing of the water supply pump 2 and the electromagnetic drain valve 4 according to a preset pressure value. A heat recovery component is also provided inside the housing 1.

[0013] like Figure 1 As shown, the heat recovery assembly includes a heat exchanger 3. The hot side channel of the heat exchanger 3 is connected in series with the return water pipe 8 between the outlet of the electromagnetic drain valve 4 and the external water tank. The cold side channel of the heat exchanger is connected in series with the water supply pipe 9 between the external water tank and the inlet of the water pump 2. The heat recovery assembly is set up so that when the pressure is released, the high-temperature water discharged flows through the hot side of the heat exchanger 3 and transfers its heat to the water supply flowing in the opposite direction on the cold side, thereby preheating the water supply. This process recovers the heat of the depressurized water, reduces the heat loss of the system, and reduces the energy consumption of the air source heat pump.

[0014] like Figure 1 As shown, it also includes an automatic control system, which includes a PLC controller 10 installed inside the housing 1. The PLC controller 10 is electrically connected to the water supply pump 2, the electromagnetic drain valve 4, the first pressure sensor 5, and the second pressure sensor 6.

[0015] like Figure 1 As shown, a check valve 11 is provided between the outlet of the water supply pump 2 and the heating pipe 7 to prevent water in the heating pipe 7 from flowing back to the external water tank when no water supply is being provided.

[0016] like Figure 1 As shown, the first pressure sensor 5 is set to close under low pressure and open under high pressure, and the second pressure sensor 6 is set to close under high pressure and open under low pressure, which can effectively maintain the pressure in the pipeline at a constant pressure.

[0017] like Figure 1 As shown, filters are installed at the front end of both the hot and cold inlets of the heat exchanger 3 to prevent impurities in the water from clogging the equipment and thus affecting the use of the air source heating system.

[0018] like Figure 1 As shown, heat exchanger 3 adopts a plate heat exchanger, which has a compact structure and high heat exchange efficiency.

[0019] The implementation principle of an air-source constant pressure device according to an embodiment of this application is as follows: Before the air source heat pump system is put into operation, the water pressure in the heating pipe 7 increases during heating. Therefore, it is necessary to set the pressure acquisition range for the corresponding first pressure sensor 5 and second pressure sensor 6 (the pressure acquisition range is set according to the site conditions, the first pressure sensor 5 is set to low pressure warning, and the second pressure sensor 6 is set to high pressure warning) in order to collect the pressure in the heating pipe 7. When the air source heat pump heating system is running, the first pressure sensor 5 and the second pressure sensor 6 will transmit the pressure collected in the heating pipe 7 to the PLC controller 10. When the pressure value collected by the second pressure sensor 6 is higher than the high end of the set range, the second pressure sensor 6 will transmit the collected data to the PLC controller 10. At the same time, the PLC controller 10 will perform data judgment and send a signal to the electromagnetic drain valve 4 to open the valve and release water and pressure. During the water release and pressure release process, the second pressure sensor 6 will continuously send pressure value signals to the PLC controller 10. When the pressure value is at the low end of the set range, the PLC controller 10 will send a signal to close the electromagnetic drain valve 4 to stop the water release and pressure release, thereby reducing the pressure in the pipe. Conversely, when the pressure value collected by the first pressure sensor 5 is lower than the lower end of the set range, it indicates that the pressure in the pipeline is insufficient, thus failing to ensure the normal operation of the high-level pipeline. At this time, the first pressure sensor 5 will also transmit the collected data to the PLC controller 10. Simultaneously, the PLC controller 10 will perform data judgment and send a signal to start the water replenishment pump 2 to replenish water into the heating pipeline 7. During the water replenishment process, the first pressure sensor 5 will also continuously send signals to the PLC controller 10. When the water pressure value rises to the higher end of the minimum water pressure range, the PLC controller 10 sends a signal to stop the water replenishment pump 2, thereby stopping the water replenishment. This ensures that the water pressure value in the air heating pipeline 7 is always kept within the set water pressure range, causing the air source heat pump to maintain a constant pressure state in the pipeline during heating. During depressurization, the high-temperature water discharged through the electromagnetic drain valve 4 flows through the hot side of the heat exchanger 3, transferring its heat to the makeup water flowing in the opposite direction on the cold side. This process not only recovers the heat of the depressurized water but also ensures the preheating of the makeup water. Since the makeup water is warm, the air source heat pump only needs to consume less energy to heat it to the set temperature, thereby saving energy, reducing system heat loss, and lowering the energy consumption of the air source heat pump.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An air-source constant pressure device, comprising a housing (1), characterized in that: The housing (1) is equipped with a water supply pump (2), an electromagnetic drain valve (4), a first pressure sensor (5), and a second pressure sensor (6). The outlet of the water supply pump (2) is connected to the heating pipe (7) through a pipe. The inlet of the electromagnetic drain valve (4) is connected to the heating pipe (7). The first pressure sensor (5) and the second pressure sensor (6) are respectively connected to the heating pipe (7) and used to detect the water pressure in the heating pipe (7) and control the opening and closing of the water supply pump (2) and the electromagnetic drain valve (4) according to the preset pressure value. The housing (1) is also equipped with a heat recovery component.

2. The air-source constant pressure device according to claim 1, characterized in that: The heat recovery assembly includes a heat exchanger (3), the hot side channel of which is connected in series with the return water pipeline (8) between the outlet of the electromagnetic drain valve (4) and the external water tank, and the cold side channel of which is connected in series with the water supply pipeline (9) between the external water tank and the inlet of the water pump (2).

3. The air-source constant pressure device according to claim 1, characterized in that: It also includes an automatic control system, which includes a PLC controller (10) installed inside the housing (1). The PLC controller (10) is electrically connected to the water supply pump (2), the electromagnetic drain valve (4), the first pressure sensor (5), and the second pressure sensor (6).

4. The air-source constant pressure device according to claim 3, characterized in that: A check valve (11) is provided between the outlet of the water supply pump (2) and the heating pipe (7).

5. The air-source constant pressure device according to claim 3, characterized in that: The first pressure sensor (5) is configured to close under low pressure and open under high pressure, and the second pressure sensor (6) is configured to close under high pressure and open under low pressure.

6. The air-source constant pressure device according to claim 2, characterized in that: The heat exchanger (3) is equipped with filters at the front end of both the hot side inlet and the cold side inlet.

7. The air-source constant pressure device according to claim 6, characterized in that: The heat exchanger (3) is a plate heat exchanger.

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