A mixing water heating device for a heat exchange station

Abstract

The present invention relates to the technical field of heating equipment, and specifically discloses a mixed water heating equipment for use in a heat exchange station, comprising a primary water supply pipe, a primary return water pipe, a secondary water supply pipe, a secondary return water pipe, a pressure reducing device, a water mixing device and a four-way device, wherein a first transmission shaft, a second transmission shaft and a hollow pipe are installed inside the four-way device; a first impeller is fixed to the first transmission shaft, and a boost impeller is fixed to the second transmission shaft; a conical filter screen communicating with the hollow pipe is fixed to the input end, and the other end of the hollow pipe is connected to a drain valve via a drain pipe; a rotating shaft and a second impeller are provided in the hollow pipe, and a scraper is fixed to the rotating shaft. The mixed water heating equipment can recover the energy released when the secondary return water flow is depressurized, and effectively utilize it, thereby avoiding energy waste and reducing comprehensive energy consumption; the mixed water heating equipment can clean and maintain the conical filter screen online, which is quick, efficient and has a good cleaning effect; the mixed water heating equipment has a simple structure, few nodes and small pipe resistance, is easy to implement, and has reliable sealing.

Description

Technical Field

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

[0002] As an important technical form in the field of centralized heating, the mixed water heating system is widely used in urban heating and industrial heat energy transmission. Its core is to achieve precise matching of user-side heating parameters through the mixed regulation of high-temperature water supply 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 pipeline network, the secondary return water needs to be reduced in pressure to adapt to the primary return water pressure requirements. Traditional technologies usually rely on devices such as throttle valves, pressure reducing valves or orifice plates to increase fluid resistance and achieve pressure reduction. The decompression process is essentially to convert the pressure potential energy of the fluid into heat energy loss or mechanical vibration energy loss through the irreversible throttling effect, resulting in a large amount of unnecessary energy waste.

[0003] In recent years, technical improvements made to address the above technical issues are not uncommon. For example, the patent with publication number CN115962083A discloses a turbine-type residual pressure recovery device and a heating system, and the patent with publication number CN222210484U discloses a residual pressure recovery device for a heating system, both of which propose a recovery and reuse scheme for the residual pressure of 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 the sealing is difficult to ensure, which increases the risk of system leakage, especially in high-pressure and high-temperature environments, making it 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 mixed water heating system, it will significantly increase the number of pipeline nodes and increase the pipe resistance, and the overall benefits achieved are not significant. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a mixed water heating device for use in heat exchange stations. This device can recycle excess pressure from secondary return water, significantly improving energy efficiency. Furthermore, the device boasts a simple overall structure, high operational stability, and ease of cleaning and maintenance.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] A water mixing heating device for use 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; the secondary water return pipe, the water mixing device, and the pressure reducing device are connected by a cross-connection device;

[0007] The four-way device is provided with an input end, a second output end and a first output end which are respectively connected to the secondary return pipe, the water mixing device and the pressure reducing device, and an inspection end which is blocked by a blocking plate; a first transmission shaft and a second transmission shaft which are transmission-connected are installed inside the four-way device via a support, and a hollow tube extending toward the input end; the first transmission shaft extends into the first output end and is fixed with a first impeller, and the second transmission shaft extends into the second output end and is fixed with a boost impeller; a conical filter screen with a sewage outlet at the bottom is fixed at 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 abutting the water inlet side of the conical filter screen is fixed on the rotating shaft.

[0008] In a preferred embodiment, the first output end includes a thick section and a thin section that 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 impeller is located in the thin section of the first output end.

[0009] In a preferred embodiment, the second output end includes a thick section and a thin section that 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.

[0010] In a preferred embodiment, the first output end and the second output end are opposite to each other, the central axes of the first transmission shaft and the second transmission shaft coincide with each other and are fixedly connected; the first runner is an axial-flow turbine, and the boost impeller is an axial-flow propeller impeller.

[0011] In a preferred embodiment, 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;

[0012] In addition, the input end is fixed with an end ring, which is fixedly connected to a connecting sleeve through several inclined arms. The inclined arms extend along the water outlet side of the conical filter screen, and the connecting sleeve is plugged into the hollow pipe; the bottom of the conical filter screen is fixedly connected to the connecting sleeve, and the sewage outlet is connected to the hollow pipe through the connecting sleeve.

[0013] In a preferred embodiment, the drain valve is a solenoid valve controlled by a controller.

[0014] In a preferred embodiment, the input end, the first output end, the second output end and the inspection end are integrated with the main body of the four-way device.

[0015] In a preferred embodiment, the second runner is an axial flow turbine.

[0016] In a preferred embodiment, bristles are fixed on the scraper strip.

[0017] Compared with the prior art, the water mixing heating equipment in the present invention has the following technical effects:

[0018] 1. During the operation of this mixed water heating equipment, the energy released when the secondary return water flow is depressurized can be recovered and effectively utilized to avoid energy waste and reduce comprehensive energy consumption.

[0019] 2. This mixed water heating equipment can clean and maintain the conical filter online without interrupting the operation of the equipment. It is fast and efficient. Compared with the backwash method, the conical filter is mechanically cleaned by a scraper, which has a more thorough cleaning effect. There is no need to disassemble and clean the conical filter during the heating cycle.

[0020] 3. The four-way device can replace the previous three-way joint and eliminate the need for a filter device installed on the secondary return pipe. This significantly improves the performance of this mixed water heating equipment compared to previous products, while making it more compact and simple in structure, taking up less space, with fewer nodes and lower pipe resistance.

[0021] 4. The first transmission shaft, the second transmission shaft, the first impeller and the booster impeller in the mixed water heating equipment are installed in a connected and continuous space. The transmission mechanism does not need to cross different pipelines. Therefore, there are no rotating mating parts on the shell of the four-way device. The structure is simpler, easy to implement and the sealing is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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, but are not intended to limit the present invention.

[0023] Figure 1 Schematic diagram of the overall structure of the mixed water heating equipment in the embodiment.

[0024] Figure 2 This is one of the external structural diagrams of the four-way device in the embodiment.

[0025] Figure 3 This is the second schematic diagram of the external structure of the four-way device in the embodiment.

[0026] Figure 4 This is one of the structural schematic diagrams of the partially cut-away four-way device in the embodiment.

[0027] Figure 5 This is the second schematic diagram of the structure of the partially cut-away four-way device in the embodiment.

[0028] Figure 6 Schematic diagram of the structure of the input end of the four-way device in the embodiment after partial cross-section.

[0029] Figure 7Schematic diagram of the working state of the four-way device when the mixed water heating equipment in the embodiment is in operation.

[0030] Figure 8 Schematic diagram of the working state of the four-way device during online cleaning and maintenance of the mixed water heating equipment in the embodiment.

[0031] In the figure, 1. secondary return pipe, 2. secondary water supply pipe, 3. temperature sensor, 4. circulating pump, 5. water mixing device, 6. flow meter, 7. primary water supply pipe, 8. flow control valve, 9. control cabinet, 10. four-way device, 101. input end, 102. second output end, 103. maintenance end, 104. first output end, 11. primary return pipe, 12. pressure reducing device, 13. sewage outlet, 14. scraper, 15. end ring, 16. conical filter, 17. sewage valve, 18. blocking plate, 19. first impeller, 20. booster impeller, 21. thin section, 22. thick section, 23. hollow pipe, 24. second transmission shaft, 25. sewage pipe, 26. support, 27. first transmission shaft, 28. inclined arm, 29. connecting sleeve, 30. second impeller, 31. rotating shaft. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See Figures 1-6As shown, the embodiment discloses the specific structure of the mixed water heating equipment in the present invention, which includes a primary water supply pipe 7, a primary return pipe 11, a secondary water supply pipe 2, a secondary return pipe 1, a pressure reducing device 12, a water mixing device 5 and a four-way device 10; the primary water supply pipe 7 and the primary return pipe 11 are used to access the primary network located on the heat source side, and the secondary water supply pipe 2 and the secondary return pipe 1 are used to access the secondary network located on the user side; the four-way device 10 includes a shell, and four flange ports are provided on the shell, namely an input end 101, a first output end 104, a second output end 102 and a maintenance end 103, 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 four-way device through the secondary return pipe 1. The inside of the cross-connection device 10 is diverted 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, and part of the secondary return water is decompressed by the four-way device 10 and the pressure reducing device 12, and then input into the primary network through the primary return pipe 11; the second output end 102 and the primary water supply pipe 7 are connected to the secondary water supply pipe 2 through the mixing device 5, and part of the secondary return water is mixed with the primary water supply through the mixing device 5, and then returned to the secondary network through the secondary water supply pipe 2; the inspection end 103 is equipped with a removable blocking plate 18 for inspecting or assembling the internal structure of the four-way device 10; a support 26 is fixed inside the four-way device 10, and the support 26 is equipped with a first transmission shaft 27 and a second transmission shaft 28. The first transmission shaft 27 and the second transmission shaft 24 are connected in transmission; the first transmission shaft 27 extends to the first output end 104, and is fixed with a first impeller 19. When the secondary return water is output through the first output end 104, the first impeller 19 is driven to rotate, and the output pressure of the first output end 104 is reduced by energy conversion; the second transmission shaft 24 extends to the second output end 102, and is fixed with a booster impeller 20. The first impeller 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 tube 23 extends in the direction of the input end 101; the input end 101 is fixed with a conical filter 16, which is conical. The filter screen 16 is conical and recessed toward the interior of the four-way device 10, with a drain outlet 13 at the bottom; the drain outlet 13 is connected to one end of a hollow tube 23, the other end of the hollow tube 23 is connected to a drain valve 17 via a drain pipe 25, and the drain valve 17 is fixed to the outside of the four-way device 10; a freely rotatable rotating shaft 31 is provided in the hollow tube 23, a second impeller 30 is fixedly connected to the rotating shaft 31, and a scraper 14 is fixed to the rotating shaft 31, the scraper 14 is abutted against the water inlet side of the conical filter screen 16, and when the secondary return water flows through the inside of the hollow tube 23, it drives the second impeller 30 to rotate. The scraper 14 is driven by the second impeller 30 to rotate against the conical filter screen 16 to mechanically clean the conical filter screen 16.

[0034] See Figure 1-Figure 4As shown, in order to ensure the rationality of the internal structural layout of the four-way device 10, the central axes of the first output end 104, the first transmission shaft 27 and the first impeller 19 coincide with each other; the central axes of the second output end 102, the second transmission shaft 24 and the boost impeller 20 coincide with each other; and the central axes of the input end 101, the hollow tube 23, the rotating shaft 31 and the second impeller 30 coincide with each other.

[0035] like Figure 1 As shown, when the mixed water heating equipment is installed and used under different working conditions, in order to meet the requirements of stable operation, the existing technology can be referred to and auxiliary components such as the circulation pump 4, the booster pump, the pressure gauge or the pressure sensor, the flow control valve 8, the temperature sensor 3, the safety valve, the check valve, the flow meter 6, the stop valve and the control cabinet 9 can be reasonably configured.

[0036] In the technical solution of the present invention, the water mixing device 5 is one of the core components of the system. Its function is to mix the high-temperature primary water supply and the low-temperature secondary return water in proportion, and output secondary water supply with stable temperature to meet the heating demand on the user side. The water mixing device 5 can be implemented with reference to the existing technology, such as using common devices such as ejectors, mixing pumps and mixing valves, combined with temperature monitoring and flow control means to regulate the mixing ratio to ensure that the secondary water supply meets the set temperature requirements.

[0037] 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, the pressure will be significantly reduced in the process of driving the first impeller 19 to rotate, thereby achieving the purpose of reducing pressure. In order to ensure that the pressure is more closely matched with the pressure required by the primary network return water, the first output end 104 is connected to a pressure reducing device 12 to further regulate the pressure of the secondary return water; based on the above-mentioned setting intention of the pressure reducing device 12, it can be implemented with reference to the commonly used methods in the prior art. For example, the pressure reducing device 12 can be one of the devices such as a pilot pressure reducing valve, an electric regulating valve and an orifice pressure reducing assembly.

[0038] The working principle of the mixed water heating equipment in the present invention is:

[0039] See Figure 1 、 Figure 7 As shown, the secondary return water returned from the secondary network enters the cross-connection device 10 through the secondary return pipe 1, and is diverted by the cross-connection device 10. Part of the secondary return water enters the water mixing device 5 through the second output end 102. The water mixing device 5 mixes the low-temperature secondary return water and the high-temperature primary supply water in proportion to a predetermined temperature, and then returns it to the secondary network through the secondary water supply pipe 2; the remaining secondary return water is output through the first output end 104, and after further decompression treatment by the decompression device 12, it is input into the primary network through the primary return pipe 11; in this cycle, the purpose of mixed water heating is achieved.

[0040] like Figure 7As shown, during the operation of the mixed water heating equipment of the present invention, when part of the secondary return water flows through the first output end 104, it will drive the first impeller 19 to rotate, thereby reducing the pressure, and the lost pressure potential energy is recovered by the first impeller 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 impeller 19 to rotate at a high speed, thereby increasing the output pressure of the other 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 workload of the heating system in maintaining the pressure required for water mixing and circulation, reduce the overall energy consumption, and at the same time, help to improve the water mixing effect, reduce local temperature fluctuations, and improve the operational stability of the heating system, thereby achieving effective utilization of recovered energy.

[0041] For a long time, there have been difficult-to-overcome technical pain points in the cleaning and maintenance of the filter devices in mixed water heating equipment. Traditional filter devices need to be shut down for disassembly and cleaning during maintenance, which is relatively cumbersome to operate and requires the heating system to be interrupted for a long time. In order to avoid the risk of downtime, a redundant design is usually adopted, and a bypass pipe is added to the filter device and a filter device is installed for the equipment, which significantly increases the cost of the equipment. The more advanced filter devices have online cleaning and maintenance functions, but most of them are based on backwashing technology, which makes it difficult to thoroughly clean the filter screen and has limited application. The mixed water heating equipment in the present invention is based on the structural characteristics of the four-way device and is integrated with an online cleaning and maintenance function, which solves the above-mentioned technical pain points; specifically:

[0042] like Figure 8 As shown, when the conical filter 16 is cleaned and maintained, the drain valve 17 is opened, and the secondary return water is discharged through the drain port 13, the hollow tube 23, the drain pipe 25 and the drain valve 17. In the process of the secondary return water flowing in the hollow tube 23, it will drive the second impeller 30 to rotate, and then drive the scraper 14 to rotate along the water inlet side of the conical filter 16. Based on the conical design of the conical filter 16, the foreign matter scraped by the scraper 14 gradually moves to the bottom of the conical filter 16, and is finally discharged with the water flow through the drain port 13, the hollow tube 23, the drain pipe 25 and the drain valve 17, thereby realizing online cleaning and maintenance of the conical filter 16 without interrupting the operation of the equipment, which is quick and efficient.

[0043] In existing mixed water heating equipment, the secondary return pipe 1 is typically connected to the mixing device 5 and the pressure reducing device 12 using a tee. The four-way device 10 in this mixed water heating equipment can replace the conventional three-way device during installation. Because the four-way device 10 is equipped with a conical filter screen 16 and has integrated cleaning and maintenance functions, it eliminates the need for a filter device installed on the secondary return pipe 1. This significantly improves the performance of this mixed water heating equipment compared to previous products, while also making it more compact and simpler, taking up less space, having fewer nodes, and reducing pipe resistance.

[0044] In the structure adopted by the mixed water heating equipment in the present invention, the first transmission shaft 27, the second transmission shaft 24, the first impeller 19 and the boost impeller 20 are installed in a connected and continuous space, and the transmission mechanism does not need to cross different pipelines. Therefore, there is no rotating mating part on the shell of the four-way device 10. Compared with the existing residual pressure recovery device, the structure is simpler, easier to implement, and the sealing is more stable and reliable. The implementation cost is low, and at the same time, higher transmission efficiency can be achieved.

[0045] See Figure 4 、 Figure 5 As shown, the first output end 104 and the second output end 102 both include a thick section 22 and a thin section 21. The thick section 22 is connected to the thin section 21 and is smoothly transitioned. 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 the end close to the port; the inner diameter of the thin section 21 is smaller than that of the thick section 22; the first impeller 19 is located in the thin section 21 of the first output end 104, and the secondary return water has a higher flow rate when flowing through the thin section 21, so that the first impeller 19 can obtain a higher rotation speed, thereby improving the energy recovery efficiency; the booster impeller 20 is located in the thick section 22 of the second output end 102, and the secondary return water has a slower flow rate when flowing through the thick section 22. The booster impeller 20 can more efficiently convert mechanical energy into pressure potential energy and kinetic energy of the secondary return water, thereby improving the energy conversion efficiency.

[0046] See Figure 2-Figure 5 As shown, the first output end 104 is directly opposite to the second output end 102, and the central axes of the first transmission shaft 27 and the second transmission shaft 24 coincide with each other and are fixedly connected; the first impeller 19 is an axial-flow turbine, and the booster impeller 20 is an axial-flow propeller impeller; based on this design, the first impeller 19 can obtain a higher speed based on the residual pressure of the secondary return water, which meets the working requirements of the booster impeller 20, and there is no need to set a complex deceleration mechanism between the first transmission shaft 27 and the second transmission shaft 24, so that the internal structure of the four-way device 10 is simpler and more compact, and can effectively reduce the energy loss during the transmission process.

[0047] See Figure 2-Figure 5 As shown, the input end 101 of the four-way device 10 is directly opposite to the inspection end 103, and the support 26 and the drain valve 17 are supported and fixed by the blocking plate 18; thereby, the shell structure of the four-way device 10 is simpler, the inner wall is smoother, and the input end 101 and the inspection end 103 are directly opposite to each other, which can facilitate the assembly operation of the internal structure of the four-way device 10;

[0048] Further, such as Figure 5 、 Figure 6As shown, an end ring 15 is fixed to the input end 101 of the four-way device 10, and the end ring 15 is fixedly connected to a connecting sleeve 29 via several inclined arms 28. The inclined arms 28 extend along the water outlet side of the conical filter 16, and the connecting sleeve 29 is plugged into the hollow tube 23. The bottom of the conical filter 16 is fixedly connected to the connecting sleeve 29, and the sewage outlet 13 is connected to the hollow tube 23 via 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 16, thereby preventing the conical filter 16 from being deformed by the impact of water flow and extending its 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 blocking plate 18, thereby improving the stability of the internal structure of the four-way device.

[0049] In a preferred embodiment, the drain valve 17 is a solenoid valve controlled by a controller, thereby enabling regular automatic cleaning and maintenance of the conical filter screen 16 without manual operation.

[0050] In a preferred embodiment, the input end 101 , the first output end 104 , the second output end 102 and the inspection end 103 are integrated with the main body of the four-way device 10 to ensure structural stability.

[0051] In a preferred embodiment, the second runner 30 is an axial flow turbine.

[0052] In a preferred embodiment, bristles (not shown) are fixed on the scraper bar 14 to improve the cleaning effect of the conical filter screen 16 .

[0053] Unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

Claims

1. A water mixing heating device for use 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 return pipe, mixing water device and 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 return pipe, mixing water device and pressure reducing device, and an inspection end blocked by a blocking plate; a first transmission shaft and a second transmission shaft with transmission connection 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 booster impeller is fixed thereon; a conical filter screen with a sewage outlet at the bottom is fixed at 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 through 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 abutting the water inlet side of the conical filter screen is fixed on the rotating shaft; the first output end is directly opposite to the second output end, and the central axes of the first transmission shaft and the second transmission shaft coincide and are fixedly connected, and no arrangement is provided between the first transmission shaft and the second transmission shaft. The deceleration mechanism comprises: a first runner is an axial-flow turbine, and a booster impeller is an axial-flow propeller impeller; the input end is opposite to the inspection end, and the support and the drain valve are supported and fixed by a blocking plate; an end ring is fixed to the input end, and the end ring is fixedly connected to a connecting sleeve via a plurality of oblique arms, the oblique arms extend along the outlet side of the conical filter, and the connecting sleeve is plugged into the hollow tube; the bottom of the conical filter is fixedly connected to the connecting sleeve, and the drain outlet is connected to the hollow tube via the connecting sleeve; the input end, the first output end, the second output end and the inspection end are an integral structure with the main body of the four-way device; the first output end and the second output end both include a thick section and a thin section that are connected 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 runner is located in the thin section of the first output end, and the booster impeller is located in the thick section of the second output end; the end ring, the oblique arms, the connecting sleeve and the hollow tube cooperate to provide support for the support on the other side opposite to the blocking plate.

2. The water mixing heating equipment for use in a heat exchange station according to claim 1, characterized in that: The sewage valve is a solenoid valve and is controlled by a controller.

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

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

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