Water mixing heat supply equipment used in heat exchange station

Abstract

The invention relates to the technical field of heat supply equipment, and particularly discloses water mixing heat supply equipment used in a heat exchange station, the water mixing heat supply equipment comprises a primary water supply pipe, a primary water return pipe, a secondary water supply pipe, a secondary water return pipe, a pressure reducing device, a water mixing device and a four-way device, and a first transmission shaft, a second transmission shaft and a hollow pipe are mounted in the four-way device; a first runner is fixed on the first transmission shaft; a booster impeller is fixed on the second transmission shaft; a conical filter screen communicated with the hollow pipe is fixed at the input end, and the other end of the hollow pipe is connected with a blow-down valve through a blow-down pipe; a rotating shaft and a second rotating wheel are arranged in the hollow pipe, and a scraping strip is fixed to the rotating shaft. According to the water mixing heat supply equipment, energy released during pressure reduction of secondary return water flow can be recycled and effectively utilized, energy waste is avoided, and comprehensive energy consumption is reduced; according to the water mixing heat supply equipment, the conical filter screen can be cleaned and maintained on line, rapidness and high efficiency are achieved, and the cleaning effect is good; the water mixing heat supply equipment is simple in structure, few in nodes, small in pipe resistance, easy to implement and reliable in sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and particularly to a mixing heating equipment for a heat exchange station. Background Art

[0002] As an important technical form in the field of central heating, the mixing heating system is widely used in urban heating and industrial heat energy transmission fields. Its core is to achieve precise matching of heat supply parameters on the user side through the mixing control of high-temperature supply water in the primary network and low-temperature return water in the secondary network. During the operation of the system, in order to ensure the stability of the hydraulic conditions of the pipe network, it is necessary to reduce the pressure of the secondary return water to adapt to the pressure requirements of the primary return water. Traditional technologies usually rely on devices such as throttle valves, pressure reducing valves, or orifice plates to increase the fluid resistance to achieve pressure reduction. This pressure reduction process essentially converts the pressure potential energy of the fluid into heat energy dissipation or mechanical vibration energy loss through an irreversible throttling effect, resulting in a large amount of unnecessary energy waste.

[0003] In recent years, technical improvements made in response to the above technical problems are not uncommon. For example, the patent with the publication number CN115962083A discloses a turbine-type residual pressure recovery device and a heating system, and the patent with the publication number CN222210484U discloses a residual pressure recovery device for a heating system, both of which propose recovery and reuse schemes for the residual pressure of the secondary return water. The above technical solutions still have significant defects in practical applications: on the one hand, the transmission mechanism of the residual pressure recovery device needs to cross mutually isolated pipes, and it is difficult to ensure the sealing performance, increasing the risk of system leakage. Especially in a high-pressure and high-temperature environment, it is difficult to maintain a long working life; on the other hand, the energy recovery device has a single function and a complex structure. When installed in a mixing heating system, it will significantly increase the pipeline nodes and pipeline resistance, and the comprehensive benefits obtained are not significant. Summary of the Invention

[0004] To solve the deficiencies in the prior art, the present invention provides a mixing heating equipment for a heat exchange station, which can recover and utilize the residual pressure of the secondary return water, significantly improving the energy utilization efficiency. At the same time, the overall structure of the mixing heating equipment is relatively simple, with high operation stability and easy to clean and maintain.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solutions: A mixing heating equipment for a heat exchange station includes a primary supply pipe and a secondary return pipe; the secondary return pipe is connected to a primary return pipe through a pressure reducing device, and the secondary return pipe and the primary supply pipe are connected to a secondary supply pipe through a mixing device; the secondary return pipe, the mixing device, and the pressure reducing device are connected by a four-way device; The four-way device is provided with an input end, a second output end, and a first output end that are respectively connected to the secondary return water pipe, the water mixing device, and the pressure reducing device, as well as a maintenance end blocked by a plug plate; inside the four-way device, a first transmission shaft and a second transmission shaft that are drivingly connected are installed via a support, as well as a hollow pipe extending towards the input end; the first transmission shaft extends into the first output end and is fixed with a first runner, the second transmission shaft extends into the second output end and is fixed with a booster impeller; a conical filter screen with a sewage outlet at the bottom is fixed at the input end; one end of the hollow pipe is communicated with the sewage outlet, and the other end is connected with a sewage valve via a sewage pipe; a rotating shaft and a second runner fixedly connected to the rotating shaft are arranged inside the hollow pipe, and a scraping strip that abuts against the water inlet side of the conical filter screen is fixed on the rotating shaft.

[0006] In a preferred embodiment, the first output end includes a thick section and a thin section that are communicated and smoothly transitionally connected. The thick section is located at one end close to the main body of the four-way device, and the thin section is located at one end close to the port; the first runner is located inside the thin section of the first output end.

[0007] In a preferred embodiment, the second output end includes a thick section and a thin section that are communicated and smoothly transitionally connected. The thick section is located at one end close to the main body of the four-way device, and the thin section is located at one end close to the port; the booster impeller is located inside the thick section of the second output end.

[0008] In a preferred embodiment, the first output end and the second output end are opposite to each other, and the central axes of the first transmission shaft and the second transmission shaft coincide and are fixedly connected; the first runner is an axial flow turbine, and the booster impeller is an axial flow propeller impeller.

[0009] In a preferred embodiment, the input end and the maintenance end are opposite to each other, and the support and the sewage valve are fixedly supported by a plug plate; In addition, an end ring is fixed at the input end. The end ring is fixedly connected with a connecting sleeve via a plurality of inclined arms. The inclined arms extend along the water outlet side of the conical filter screen. The connecting sleeve is in plug-in fit with the hollow pipe; the bottom of the conical filter screen is fixedly connected with the connecting sleeve, and the sewage outlet is communicated with the hollow pipe via the connecting sleeve.

[0010] In a preferred embodiment, the sewage valve is an electromagnetic valve and is controlled by a controller.

[0011] In a preferred embodiment, the input end, the first output end, the second output end, and the maintenance end are of an integral structure with the main body of the four-way device.

[0012] In a preferred embodiment, the second runner is an axial flow turbine.

[0013] In a preferred embodiment, bristles are fixed on the scraping strip.

[0014] Compared with the prior art, the water mixing heating equipment in the present invention has the following technical effects: 1. During the operation of this mixing water heating equipment, the energy released during the decompression of the secondary return water flow can be recovered and effectively utilized, avoiding energy waste and reducing the comprehensive energy consumption.

[0015] 2. This mixing water heating equipment can clean and maintain the conical filter online without interrupting the equipment operation, which is fast and efficient. Compared with the backwashing method, the conical filter is mechanically cleaned by a scraping strip, and the cleaning effect is more thorough. There is no need to disassemble and wash the conical filter during the heating period.

[0016] 3. The four-way device can replace the previous three-way joint and can eliminate the filter device installed on the secondary return water pipe. As a result, compared with the previous products, the performance of this mixing water heating equipment has been significantly improved, but the structure is more compact and simple, occupying less space, having fewer nodes and less pipe resistance.

[0017] 4. The first drive shaft, the second drive shaft, the first runner and the booster impeller in this mixing water heating equipment are installed in a connected and continuous space, and the transmission mechanism does not need to cross different pipelines. Therefore, there are no rotating mating parts on the housing of the four-way device, the structure is simpler, easier to implement and the sealing performance is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of the mixing water heating equipment in the embodiment.

[0020] Figure 2 It is one of the external structure schematic diagrams of the four-way device in the embodiment.

[0021] Figure 3 It is the second external structure schematic diagram of the four-way device in the embodiment.

[0022] Figure 4 It is one of the schematic diagrams of the structure of the four-way device after partial sectioning in the embodiment.

[0023] Figure 5 It is the second schematic diagram of the structure of the four-way device after partial sectioning in the embodiment.

[0024] Figure 6 It is a schematic diagram of the structure of the input end of the four-way device after partial sectioning in the embodiment.

[0025] Figure 7 It is a schematic diagram of the working state of the four-way device when the mixing water heating equipment is operating in the embodiment.

[0026] Figure 8 Schematic diagram of the working state of the four-way device during on-line cleaning and maintenance of the mixing water heating equipment in the embodiment.

[0027] In the figure, 1 is the secondary return water pipe, 2 is the secondary supply water pipe, 3 is the temperature sensor, 4 is the circulation pump, 5 is the mixing device, 6 is the flow meter, 7 is the primary supply water pipe, 8 is the flow control valve, 9 is the control cabinet, 10 is the four-way device, 101 is the input end, 102 is the second output end, 103 is the maintenance end, 104 is the first output end, 11 is the primary return water pipe, 12 is the pressure reducing device, 13 is the sewage outlet, 14 is the scraping strip, 15 is the end ring, 16 is the conical filter screen, 17 is the sewage valve, 18 is the plug plate, 19 is the first runner, 20 is the booster impeller, 21 is the thin section, 22 is the thick section, 23 is the hollow pipe, 24 is the second transmission shaft, 25 is the sewage pipe, 26 is the support, 27 is the first transmission shaft, 28 is the inclined arm, 29 is the connecting sleeve, 30 is the second runner, 31 is the rotating shaft. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0029] Refer to Figures 1-6As shown, the embodiment discloses the specific structure of the mixing water heating device in the present invention, which includes a primary supply pipe 7, a primary return pipe 11, a secondary supply pipe 2, a secondary return pipe 1, a pressure reducing device 12, a mixing device 5, and a four-way device 10; the primary supply pipe 7 and the primary return pipe 11 are used to access the primary network provided on the heat source side, and the secondary supply pipe 2 and the secondary return pipe 1 are used to access the secondary network provided on the user side; the four-way device 10 includes a housing, and four flange ports are provided on the housing, which are an input end 101, a first output end 104, a second output end 102, and a maintenance end 103 respectively. The input end 101 is connected to the secondary return pipe 1, and the secondary return water returned from the secondary network can enter the interior of the four-way device 10 through the secondary return pipe 1 and is shunted by the four-way device 10; the first output end 104 is connected to the primary return pipe 11 through the pressure reducing device 12. After partial secondary return water is decompressed by the four-way device 10 and the pressure reducing device 12, it is input into the primary network through the primary return pipe 11; the second output end 102 and the primary supply pipe 7 are connected to the secondary supply pipe 2 through the mixing device 5. After partial secondary return water is mixed with the primary supply water by the mixing device 5, it is returned to the secondary network through the secondary supply pipe 2; a detachable plug plate 18 is installed at the maintenance end 103 for maintaining or assembling the internal structure of the four-way device 10; a support 26 is fixed inside the four-way device 10, and a first transmission shaft 27, a second transmission shaft 24, and a hollow pipe 23 are installed on the support 26; the first transmission shaft 27 and the second transmission shaft 24 are in transmission connection; the first transmission shaft 27 extends into the first output end 104 and is fixed with a first runner 19. When the secondary return water is output through the first output end 104, it drives the first runner 19 to rotate, and the output pressure of the first output end 104 is reduced through energy conversion; the second transmission shaft 24 extends into the second output end 102 and is fixed with a booster impeller 20. The first runner 19 drives the booster impeller 20 to rotate through the first transmission shaft 27 and the first transmission shaft 27 to increase the output pressure of the second output end 102; the hollow pipe 23 extends in the direction of the input end 101; a conical filter screen 16 is fixed at the input end 101. The conical filter screen 16 is conical, concave towards the interior of the four-way device 10, and a sewage outlet 13 is provided at the bottom; the sewage outlet 13 is connected to one end of the hollow pipe 23, and the other end of the hollow pipe 23 is connected to a sewage valve 17 through a sewage pipe 25, and the sewage valve 17 is fixed outside the four-way device 10; a rotatable shaft 31 that can rotate freely is provided inside the hollow pipe 23. A second runner 30 is fixedly connected to the rotatable shaft 31, and a scraping bar 14 is fixed on the rotatable shaft 31. The scraping bar 14 abuts against the water inlet side of the conical filter screen 16. When the secondary return water flows through the interior of the hollow pipe 23, it will drive the second runner 30 to rotate, and the scraping bar 14 is driven by the second runner 30 to rotate against the conical filter screen 16 to mechanically clean the conical filter screen 16.

[0030] See Figures 1-4As shown, to ensure the rationality of the internal structure layout of the four-way device 10, the central axes of the first output end 104, the first transmission shaft 27, and the first runner 19 coincide; the central axes of the second output end 102, the second transmission shaft 24, and the booster impeller 20 coincide; the central axes of the input end 101, the hollow pipe 23, the rotating shaft 31, and the second runner 30 coincide.

[0031] As Figure 1 shown, when the present mixing water heating equipment is installed and used under different working conditions, to meet the requirements of stable operation, auxiliary components such as a circulation pump 4, a booster pump, a pressure gauge or a pressure sensor, a flow control valve 8, a temperature sensor 3, a safety valve, a check valve, a flowmeter 6, a stop valve, and a control cabinet 9 can be reasonably configured with reference to the prior art.

[0032] In the technical solution of the present invention, the mixing water device 5 is one of the core components of the system. Its function is to mix the high-temperature primary supply water and the low-temperature secondary return water in proportion and output the secondary supply water with a stable temperature to meet the heating demand on the user side. The mixing water device 5 can be implemented with reference to the prior art. For example, common devices such as an ejector, a mixing pump, and a mixing valve can be used, and temperature monitoring and flow control means can be combined to regulate the mixing ratio to ensure that the secondary supply water meets the set temperature requirements.

[0033] In the technical solution of the present invention, when the secondary return water flows through the first output end 104 of the four-way device 10 and drives the first runner 19 to rotate, the pressure will be significantly reduced to achieve the purpose of pressure reduction. To ensure a better match with the pressure requirement of the primary network return water, a pressure reducing device 12 is connected to the first output end 104 to further regulate the pressure of the secondary return water; based on the above setting intention of the pressure reducing device 12, it can be implemented with reference to common methods in the prior art. For example, the pressure reducing device 12 can be a pilot-operated pressure reducing valve, an electric control valve, or an orifice plate pressure reducing component, etc.

[0034] The working principle of the mixing water heating equipment in the present invention is as follows: Refer to Figure 1 、 Figure 7 As shown, the secondary return water returned from the secondary network enters the four-way device 10 through the secondary return water pipe 1 and is shunted by the four-way device 10. Part of the secondary return water enters the mixing water device 5 through the second output end 102. After the mixing water device 5 mixes the low-temperature secondary return water and the high-temperature primary supply water in proportion to a predetermined temperature, it is returned to the secondary network through the secondary supply water pipe 2; the remaining part of the secondary return water is output through the first output end 104, and after further pressure reduction treatment by the pressure reducing device 12, it is input into the primary network through the primary return water pipe 11; and so on in a cycle to achieve the purpose of mixing water heating.

[0035] As Figure 7As shown in the figure, during the operation of the mixing heating equipment in the present invention, when a part of the secondary return water flows through the first output end 104, it will drive the first runner 19 to rotate, realizing pressure reduction, and the lost pressure potential energy is recovered by the first runner 19; under the transmission action of the second transmission shaft 24 and the first transmission shaft 27, the booster impeller 20 is driven by the first runner 19 to rotate at a high speed, increasing the output pressure of another part of the secondary return water at the second output end 102. The increase in the pressure at the second output end 102 can reduce the working load borne by the heating system to maintain the pressure required for mixing and circulation, reduce the comprehensive energy consumption. At the same time, it helps to improve the mixing effect, reduce local temperature fluctuations, and improve the operating stability of the heating system, thereby realizing the effective utilization of the recovered energy.

[0036] For a long time, there have been technical pain points that are difficult to overcome in the cleaning and maintenance of the filtering device in the mixing heating equipment. When maintaining the traditional filtering device, it is necessary to stop the machine for disassembly and cleaning, and the operation is relatively troublesome, and the heating system needs to be interrupted for a long time. To avoid the risk of shutdown, redundant design is usually adopted, a bypass pipeline is added at the filtering device and a standby filtering device is installed, which significantly increases the equipment cost investment. The more advanced filtering devices have the function of online cleaning and maintenance, but most of them are based on backwashing technology and it is difficult to thoroughly clean the filter screen, so the application is relatively limited. Based on the structural characteristics of the four-way device, the mixing heating equipment in the present invention integrates the function of online cleaning and maintenance, making the above technical pain points solved; specifically: As Figure 8 shown in the figure, when cleaning and maintaining the conical filter screen 16, open the drain valve 17, and the secondary return water is discharged through the drain port 13, the hollow pipe 23, the drain pipe 25 and the drain valve 17. During the flow of the secondary return water in the hollow pipe 23, it will drive the second runner 30 to rotate, and then drive the scraping strip 14 to rotate along the water inlet side of the conical filter screen 16. Based on the conical design of the conical filter screen 16, the foreign matters scraped by the scraping strip 14 gradually move towards the bottom of the conical filter screen 16, and finally are discharged through the drain port 13, the hollow pipe 23, the drain pipe 25 and the drain valve 17 along with the water flow, realizing the online cleaning and maintenance of the conical filter screen 16 without interrupting the equipment operation, which is fast and efficient.

[0037] In the existing mixing heating equipment, the secondary return water pipe 1 usually uses a three-way joint to establish connections with the mixing device 5 and the pressure reducing device 12. When installing the four-way device 10 in this mixing heating equipment, it can replace the previous three-way joint. Since the four-way device 10 is provided with a conical filter screen 16 and integrates the cleaning and maintenance function, the filtering device installed on the secondary return water pipe 1 can be omitted. As a result, compared with the previous products, the performance of this mixing heating equipment has been significantly improved, but the structure is more compact and simple, occupying less space, having fewer nodes and less pipe resistance.

[0038] In the structure adopted by the mixing water heating equipment in the present invention, the first transmission shaft 27, the second transmission shaft 24, the first runner 19 and the boosting impeller 20 are installed in a communicating and continuous space, and the transmission mechanism does not need to cross different pipelines. Therefore, there are no rotating fitting parts on the housing of the four-way device 10. Compared with the existing residual pressure recovery and utilization device, the structure is simpler, easier to implement, the sealing performance is more stable and reliable, the implementation cost is low, and at the same time, a higher transmission efficiency can be achieved.

[0039] See Figure 4 , Figure 5 As shown, both the first output end 104 and the second output end 102 include a thick section 22 and a thin section 21. The thick section 22 and the thin section 21 are communicated and smoothly transitionally connected. The thick section 22 is located at one end close to the main body of the four-way device 10, and the thin section 21 is located at one end close to the port. The inner diameter of the thin section 21 is smaller than that of the thick section 22. The first runner 19 is located in the thin section 21 of the first output end 104. When the secondary return water flows through the thin section 21, it has a higher flow rate, enabling the first runner 19 to obtain a higher rotational speed, thereby improving the energy recovery efficiency. The boosting impeller 20 is located in the thick section 22 of the second output end 102. When the secondary return water flows through the thick section 22, the flow rate is relatively slow, and the boosting impeller 20 can more efficiently convert mechanical energy into the pressure potential energy and kinetic energy of the secondary return water to improve the energy conversion efficiency.

[0040] See Figures 2-5 As shown, the first output end 104 and the second output end 102 are facing each other. The central axes of the first transmission shaft 27 and the second transmission shaft 24 coincide and are fixedly connected. The first runner 19 is an axial flow turbine, and the boosting impeller 20 is an axial flow propeller impeller. Based on this design, the first runner 19 can obtain a higher rotational speed based on the residual pressure of the secondary return water to meet the working requirements of the boosting impeller 20, and there is no need to set up a complex speed reduction mechanism between the first transmission shaft 27 and the second transmission shaft 24, making the internal structure of the four-way device 10 simpler, more compact, and effectively reducing the energy loss during the transmission process.

[0041] See Figures 2-5 As shown, the input end 101 of the four-way device 10 and the maintenance end 103 are facing each other. The support 26 and the sewage valve 17 are supported and fixed by the plug plate 18. Thus, the housing structure of the four-way device 10 is made simpler, the inner wall is smoother, and the input end 101 and the maintenance end 103 are facing each other, which provides convenience for the assembly operation of the internal structure of the four-way device 10. Furthermore, as shown in Figure 5 , Figure 6As shown, an end ring 15 is fixed to the input end 101 of the four-way device 10. The end ring 15 is fixedly connected to a connecting sleeve 29 through a plurality of inclined arms 28. The inclined arms 28 extend along the water outlet side of the conical filter screen 16. The connecting sleeve 29 is inserted and matched with the hollow tube 23. The bottom of the conical filter screen 16 is fixedly connected to the connecting sleeve 29, and the sewage outlet 13 is communicated with the hollow tube 23 through the connecting sleeve 29. Based on this design, on the one hand, the end ring 15, the connecting sleeve 29 and the inclined arms 28 can provide stable support for the conical filter screen 16, avoiding the deformation of the conical filter screen 16 caused by the impact of water flow and extending the working life. On the other hand, the end ring 15, the inclined arms 28, the connecting sleeve 29 and the hollow tube 23 cooperate to provide support for the support 26 on the other side opposite to the plugging plate 18, improving the stability of the internal structure of the four-way device.

[0042] In a preferred embodiment, the sewage valve 17 is a solenoid valve and is controlled by a controller, whereby the conical filter screen 16 can be automatically cleaned and maintained regularly without manual operation.

[0043] In a preferred embodiment, the input end 101, the first output end 104, the second output end 102 and the maintenance end 103 are of an integral structure with the main body of the four-way device 10 to ensure structural stability.

[0044] In a preferred embodiment, the second runner 30 is an axial flow turbine.

[0045] In a preferred embodiment, bristles (not shown) are fixed on the scraping strip 14 to improve the cleaning effect on the conical filter screen 16.

[0046] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object to be described changes, the relative positional relationship may also change accordingly.

Claims

1. A water mixing heating device used in a heat exchange station, comprising a primary water supply pipe and a secondary water return pipe; the secondary water return pipe is connected to the primary water return pipe via a pressure reducing device, and the secondary water return pipe and the primary water supply pipe are connected to the secondary water supply pipe via a water mixing device; characterized in that: The secondary water return pipe, the water mixing device and the pressure reducing device are connected by a four-way device; the four-way device is provided with an input end, a second output end and a first output end respectively connected to the secondary water return pipe, the water mixing device and the pressure reducing device, and a maintenance end blocked by a blocking plate; a first transmission shaft and a second transmission shaft connected in transmission are installed inside the four-way device through a support, and a hollow tube extending toward the input end; the first transmission shaft extends into the first output end, and a first impeller is fixed thereon, and the second transmission shaft extends into the second output end, and a boost impeller is fixed thereon; a conical filter screen with a sewage outlet at the bottom is fixed to the input end; one end of the hollow tube is connected to the sewage outlet, and the other end is connected to a sewage valve via a sewage pipe; a rotating shaft and a second impeller fixedly connected to the rotating shaft are provided in the hollow tube, and a scraper close to the water inlet side of the conical filter screen is fixed on the rotating shaft.

2. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The first output end includes a thick section and a thin section which are interconnected and smoothly transitioned, the thick section is located at one end close to the main body of the four-way device, and the thin section is located at one end close to the port; the first wheel is located in the thin section of the first output end.

3. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The second output end includes a thick section and a thin section which are interconnected and smoothly transitioned, the thick section is located at one end close to the main body of the four-way device, and the thin section is located at one end close to the port; the booster impeller is located in the thick section of the second output end.

4. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The first output end is directly opposite to the second output end, the central axes of the first transmission shaft and the second transmission shaft coincide and are fixedly connected; the first runner is an axial flow turbine, and the boost impeller is an axial flow propeller impeller.

5. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The input end is directly opposite to the inspection end, and the support and the drain valve are supported and fixed by a blocking plate.

6. The water mixing heating equipment used in a heat exchange station according to claim 5, characterized in that: The input end is fixed with an end ring, which is fixedly connected to a connecting sleeve via a plurality of inclined arms, the inclined arms extend along the water outlet side of the conical filter, and the connecting sleeve is plugged into and matched with the hollow pipe; the bottom of the conical filter is fixedly connected to the connecting sleeve, and the sewage outlet is connected to the hollow pipe via the connecting sleeve.

7. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The drain valve is a solenoid valve controlled by a controller.

8. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The input end, the first output end, the second output end and the inspection end are an integrated structure with the main body of the four-way device.

9. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: The second runner is an axial flow turbine.

10. The water mixing heating equipment used in a heat exchange station according to claim 1, characterized in that: Brush bristles are fixed on the scraping strip.

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