A central heating pump station

Abstract

The present application relates to heat pump station technical field, disclose a kind of central heating heat pump station, comprising: water pump, water supply main, water delivery structure and high-level expansion tank.Water supply main is connected with the water outlet end of water pump;Water delivery structure includes secondary network backwater main and filter assembly, filter assembly is detachably installed between water pump and secondary network backwater main;High-level expansion tank is set above secondary network backwater main, and is communicated with secondary network backwater main;Water delivery structure further includes exhaust assembly, exhaust assembly is set in the upper end surface of secondary network backwater main, and exhaust assembly is used to discharge the gas in secondary network backwater main.The present application realizes the automatic discharge of gas in pipeline, when it is needed to clean filter plate, can be quickly completed disassembly and assembly, when water temperature rises and volume expands, excess water expands into high-level expansion tank;When water level is too high, it is discharged through overflow pipe, when system is short of water, it is automatically watered, improve the operating efficiency and stability of heating system.

Description

Technical Field

[0001] This invention relates to the field of heating pump station technology, and specifically to a centralized heating pump station. Background Technology

[0002] Central heating pumping stations are the core equipment in urban centralized heating systems. Their main function is to drive the circulation of hot water or steam in the heating network, ensuring that heat can be efficiently and stably delivered to each heat user. A typical centralized heating pumping station includes water pumps, filtration devices, venting devices, water supply and pressure stabilization devices, and corresponding piping systems.

[0003] In centralized heating pumping stations, the inlet pipes of the water pumps are typically directly connected to the secondary network return water main. To prevent impurities in the pipeline from entering the pump, a filter pipe is often installed at the inlet. However, most filter pipes are rigidly connected to the pipeline, making maintenance inconvenient and potentially affecting the normal operation of the pump due to untimely cleaning. Furthermore, during the operation of the heating system, gas accumulation at high points in the pipeline or low pressure at the pump inlet can easily lead to water vaporization, causing problems such as excessive noise, severe vibration, and reduced pump output. Although some existing pumping stations have manual air vents at high points in the pipeline, these require periodic manual operation, and untimely air venting can still cause malfunctions. Regarding system pressure stabilization and water replenishment, traditional centralized heating pumping stations often use a water replenishment pump in conjunction with a pressure tank or frequency converter control for pressure stabilization. When system pressure fluctuates, the water replenishment pump frequently starts and stops, increasing energy consumption and easily causing pressure oscillations, affecting the stability of the heating supply. Summary of the Invention

[0004] In view of this, the present invention provides a centralized heating pump station to solve the problems of inconvenient maintenance of filter plates, easy accumulation of gas at high points of the pipeline network, and the impact of frequent start-stop and pressure stabilization of the water supply pump on the stability of heating in related heating pump stations.

[0005] In a first aspect, the present invention provides a centralized heating pumping station, comprising: Water pump; The water supply main is connected to the outlet end of the water pump; The water supply structure includes a secondary network return water main and a filter assembly, wherein the filter assembly is detachably installed between the water pump and the secondary network return water main; An elevated expansion tank is located above the secondary network return water main and is connected to the secondary network return water main. The water conveying structure also includes an air venting assembly, which is disposed on the upper end face of the secondary network return water main pipe and is used to discharge the accumulated air in the secondary network return water main pipe.

[0006] Beneficial Effects: By installing an venting assembly at the top of the secondary network return water main near the output end, automatic air release from the pipe is achieved without manual operation. This effectively solves problems such as high noise, severe vibration, and reduced output caused by water vaporization due to air accumulation in the inlet pipe or low suction pressure, ensuring stable operation of the heating network. The filter assembly is detachably installed between the water pump and the secondary network return water main. Cleaning the filter plate can be quickly and easily performed, reducing maintenance difficulty and operating costs. A high-level expansion tank is installed above and after the secondary network return water main. Gravity naturally achieves pressure stabilization and water replenishment. When the water temperature rises and the volume expands, excess water expands into the high-level expansion tank; when the water level is too high, it is discharged through the overflow pipe; and automatic water replenishment occurs when the system is short of water. The entire process requires no electricity, and the replenishment pump does not need frequent start-stop, improving the operating efficiency and stability of the heating system.

[0007] In one alternative implementation, the exhaust assembly includes: An exhaust valve body is installed on the upper end face of the secondary network return water main pipe, and an installation cavity communicating with the secondary network return water main pipe is opened inside it. An exhaust port is provided on the side wall of the exhaust valve body; A first support rod is fixedly installed on the top surface of the mounting cavity, and a sliding groove is provided on the first support rod along the axial direction; The second support rod is slidably fitted into the slide groove; A floating plate is installed at the end of the second support rod away from the first support rod, and the floating plate is slidably and sealingly connected to the side wall of the mounting cavity; A spring is sleeved on the second support rod, with its two ends abutting against the first support rod and the floating plate, respectively.

[0008] In one optional embodiment, a plurality of exhaust holes are provided, and the plurality of exhaust holes are arranged in a ring at intervals on the side wall of the exhaust valve body.

[0009] Beneficial effects: By incorporating a first support rod fixed to the top surface inside the exhaust valve body, a second support rod slidably engaged with the first support rod's groove, and a spring sleeved on the second support rod, stable guidance of the floating plate's lifting and lowering motion is achieved. The second support rod slides within the groove, effectively limiting the radial sway of the floating plate and preventing it from jamming or failing to seal due to misalignment, thus improving the reliability and service life of the exhaust action. The spring, sleeved on the second support rod and abutting against the first support rod and the floating plate, enables constant-pressure automatic exhaust. Multiple exhaust holes increase the exhaust flow area, allowing gas to be discharged simultaneously from multiple directions, resulting in higher exhaust efficiency and avoiding the risk of exhaust function failure due to blockage of a single exhaust hole.

[0010] In one optional embodiment, the filter assembly includes: a filter tube and first flanges disposed at both ends of the filter tube, wherein a filter plate is disposed inside the filter tube; One end of the filter tube is connected to the water pump via a first flange.

[0011] In one optional embodiment, a second flange is provided at one end of the secondary network return water main near the water pump; The first flange and the second flange on the filter pipe, which are close to the secondary network return water main, cooperate to connect the secondary network return water main to the filter pipe.

[0012] In one alternative embodiment, a sealing ring is provided at the outer end of the first flange away from the filter tube; The second flange and the end of the water pump near the filter pipe are both provided with sealing grooves corresponding to the sealing ring; The two sets of sealing rings are respectively fitted into the two sets of sealing grooves.

[0013] Beneficial effects: By installing sealing rings at the outer ends of the first flanges at both ends of the filter pipe, and sealing grooves at corresponding positions on the second flange and the water pump, a seal is formed between the filter pipe and the secondary network return water main, and between the filter pipe and the water pump, through the locking mechanism of the sealing rings and sealing grooves. Compared to traditional flat gasket sealing methods, the locking structure of the sealing rings and sealing grooves has a self-positioning function during installation, preventing the seal from shifting or falling off during installation, thus improving the convenience of installation and the reliability of the seal.

[0014] With its detachable connection, this structure allows maintenance personnel to quickly remove the entire filter tube without damaging the pipeline, significantly shortening the time required to clean or replace the filter plate. It is suitable for maintenance scenarios in centralized heating pump stations where filter plates need to be cleaned regularly, and has high practical value.

[0015] In one alternative implementation, it further includes: The outriggers are installed at the bottom of the elevated expansion tank; The expansion pipe has one end connected to the lower front end of the high-level expansion tank near the secondary network return water main, and the other end connected to the top end of the secondary network return water main. The overflow pipe is connected at one end to the upper rear side of the high-level expansion tank, away from the secondary network return water main.

[0016] In one alternative embodiment, a horn cover is installed at the end of the overflow pipe away from the high-level expansion tank.

[0017] In one optional embodiment, the high-level expansion tank is further provided with a liquid level pipe.

[0018] Beneficial effects: By installing support legs at the bottom of the elevated expansion tank, the tank can be stably supported above and behind the secondary network return water main, ensuring the height difference between the tank and the main. This allows for natural gravity-based constant-pressure water replenishment, eliminating the need for additional electrical or mechanical pressurization devices. An expansion pipe connected to the top of the secondary network return water main at the lower front end and an overflow pipe at the upper rear end enable automatic reception of thermal expansion water and automatic discharge of excess water. The horn-shaped cover increases the outlet cross-sectional area, reduces the water flow impact velocity, and prevents overflow water from splashing directly onto the ground, improving operational safety and site cleanliness. The level gauge on the elevated expansion tank provides a clear and real-time view of the water level inside the tank, allowing operators to monitor system water volume changes promptly, detect anomalies in a timely manner, and facilitate daily inspections and maintenance.

[0019] In one alternative embodiment, the water pump is provided with a mounting base at its bottom end. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of a centralized heating pump station from one angle according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of a centralized heating pump station from another angle, according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the internal structure of the exhaust assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the filter assembly and the secondary network return water main pipe according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the installation of the filter assembly, the first flange, and the second flange according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Water pump; 11. Mounting bracket; 2. Water supply main; 3. Secondary network return water main; 31. Second flange; 4. Filter tube; 41. First flange; 42. Filter plate; 5. High-level expansion tank; 51. Support legs; 52. Expansion pipe; 53. Overflow pipe; 54. Horn cover; 55. Liquid level pipe; 6. Exhaust valve body; 61. Exhaust port; 62. First support rod; 63. Second support rod; 64. Floating plate; 65. Spring; 7. Sealing ring; 8. Sealing groove; 9. Bolts; 10. Nuts. Detailed Implementation

[0022] 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. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In relevant centralized heating pumping stations, the inlet pipe of water pump 1 is usually directly connected to the secondary network return water main 3. To prevent impurities in the pipeline from entering water pump 1, a filter plate 42 or filter pipe 4 is often installed at the inlet. However, most filter pipes 4 are rigidly connected to the pipeline, making maintenance inconvenient and even affecting the normal operation of water pump 1 due to untimely cleaning. In addition, during the operation of the heating system, water vaporization can easily occur due to gas accumulation at high points of the pipeline or low pressure at the suction inlet of water pump 1, leading to problems such as loud noise, severe vibration, and reduced output of water pump 1. Although some existing pumping stations have manual air vents installed at high points of the pipeline, they require regular manual operation, and untimely air venting can still cause malfunctions. Regarding system pressure stabilization and water replenishment, traditional centralized heating pumping stations mostly use a water replenishment pump 1 in conjunction with a pressure tank or frequency converter control for pressure stabilization. When the system pressure fluctuates, the water replenishment pump 1 frequently starts and stops, which not only increases energy consumption but also easily causes pressure oscillations, affecting the stability of heating. Although some systems use high-level expansion tanks 5 to maintain pressure by gravity, these tanks are often set up independently from structures such as exhaust and filtration, lacking system integration and optimization.

[0024] To solve the above technical problems, the following will be combined with... Figures 1 to 5 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a centralized heating pumping station is provided, comprising: a water pump 1, a water supply main pipe 2, a water conveyance structure, and a high-level expansion tank 5.

[0026] like Figures 1 to 2As shown, water pump 1, serving as the power unit of the entire centralized heating pumping station, is fixedly installed via mounting base 11 at its bottom. The water supply main pipe 2 is connected to the outlet of water pump 1, and water pump 1 pumps the hot water in the water supply main pipe 2 to the water storage structure. The water supply structure includes a secondary network return water main pipe 3, a filter assembly, and an air venting assembly. One end of the filter assembly is detachably connected to the inlet of water pump 1, and the other end is detachably connected to the secondary network return water main pipe 3. The filter assembly is connected to both the outlet of water pump 1 and the secondary network return water main pipe 3. The air venting assembly is located on the upper surface of the secondary network return water main pipe 3 to expel accumulated air within it. An elevated expansion tank 5 is located above and behind the secondary network return water main pipe 3, meaning it is positioned behind the secondary network return water main pipe 3 and is higher than it. The elevated expansion tank 5 is connected to the top of the secondary network return water main pipe 3.

[0027] When water pump 1 is turned on, hot water enters through the secondary network return main pipe 3, flows through the filter assembly, and is pumped by water pump 1 into the supply main pipe 2, and then discharged into the heating network. When air accumulates in the secondary network return main pipe 3, the air enters the venting assembly. When the gas pressure reaches a certain value, the venting assembly automatically vents the air. At the same time, when the circulating water temperature rises, the water volume expands, and the excess water expands into the high-level expansion tank 5 through the expansion pipe 52. When the water level in the high-level expansion tank 5 is too high, the water in the tank is discharged into the floor drain through the overflow pipe 53. When the water level in the secondary network return main pipe 3 is low, the water in the high-level expansion tank 5 replenishes the secondary network return main pipe 3 through the expansion pipe 52. This process requires no electricity and has a simple structure.

[0028] The above-described integrated structure, by installing an exhaust component at the top of the secondary network return water main 3 near the output end, achieves automatic discharge of accumulated air in the pipe without manual operation. This effectively solves the problems of high noise, severe vibration, and reduced output caused by water vaporization due to air accumulation in the inlet pipe or low suction pressure of the water pump 1, ensuring the stable operation of the heating network. By detachably installing the filter component between the water pump 1 and the secondary network return water main 3, it can be quickly disassembled and reassembled when cleaning the filter plate 42 is required, making operation convenient and facilitating the disassembly and cleaning of the filter pipe 4, reducing maintenance difficulty and operating costs. By installing a high-level expansion tank 5 above and behind the secondary network return water main 3, the system utilizes gravity to naturally achieve constant pressure and water replenishment functions. When the water temperature rises and the volume expands, the excess water expands into the high-level expansion tank 5; when the water level is too high, it is discharged through the overflow pipe 53; and when the system is short of water, it automatically replenishes water. The entire process requires no electric drive, and the water replenishment pump does not need to be frequently started and stopped, improving the operating efficiency and stability of the heating system.

[0029] In one embodiment, such as Figure 3As shown, the exhaust assembly includes: an exhaust valve body 6, an exhaust port 61, a first support rod 62, a second support rod 63, a floating plate 64, and a spring 65.

[0030] The vent valve body 6 is fixedly installed on the upper end face of the secondary network return water main pipe 3. The vent valve body 6 is cylindrical in shape and has a cylindrical mounting cavity inside. This mounting cavity opens downwards and is connected to the secondary network return water main pipe 3. Several vent holes 61 are provided on the side wall of the vent valve body 6, arranged in a ring at intervals on the side wall of the vent valve body 6, all at the same height. The first support rod 62 is fixedly installed on the top surface of the mounting cavity. A sliding groove is formed along the axial direction at the center of the first support rod 62. The second support rod 63 is slidably engaged in this groove, meaning the second support rod 63 can slide up and down axially within the groove. A floating plate 64 is installed at the end of the second support rod 63 away from the first support rod 62. The outer diameter of the floating plate 64 corresponds to the inner diameter of the mounting cavity, and the floating plate 64 is slidably and sealingly connected to the side wall of the mounting cavity. When the floating plate 64 moves up and down, it maintains a seal with the side wall of the mounting cavity, preventing liquid leakage. Spring 65 is sleeved on the second support rod 63, with its two ends abutting against the first support rod 62 and the floating plate 64, respectively. Under normal conditions, spring 65 applies a downward preload to the floating plate 64, keeping it at a certain height. When the floating plate 64 is subjected to upward gas pressure, spring 65 is compressed, and the floating plate 64 moves upward.

[0031] When there is no air accumulation or the air pressure inside the secondary network return water main 3 is low, the elastic force of the spring 65 is greater than the upward thrust of the gas on the floating plate 64. The floating plate 64 remains in the lower position of the mounting cavity, isolating the vent 61 from the liquid area at the bottom of the mounting cavity to prevent hot water leakage. When gas accumulates in the secondary network return water main 3 and the gas pressure rises to a certain value, the gas enters the mounting cavity of the vent valve body 6, generating upward pressure on the bottom of the floating plate 64. When this pressure is sufficient to overcome the elastic force of the spring 65, the floating plate 64 is pushed upward. The floating plate 64 drives the second support rod 63 to slide upward along the groove of the first support rod 62, while compressing the spring 65. When the floating plate 64 moves to the height of the vent 61, the interior of the mounting cavity is connected to the outside atmosphere through the vent 61, and the gas is evenly discharged from multiple vents 61 arranged in a ring. After the gas is discharged, the pressure inside the installation cavity decreases, and the elastic force of the spring 65 pushes the floating plate 64 to return to its original position downward. At the same time, the second support rod 63 slides downward along the groove, and the floating plate 64 re-closes the exhaust hole 61, restoring the sealed state.

[0032] By incorporating a first support rod 62 fixed to the top surface inside the exhaust valve body 6, a second support rod 63 slidably engaged with the first support rod 62 via a groove, and a spring 65 sleeved on the second support rod 63, stable guidance for the lifting and lowering movement of the floating plate 64 is achieved. The second support rod 63 slides within the groove, effectively limiting the radial sway of the floating plate 64, preventing jamming or sealing failure due to misalignment, and improving the reliability and service life of the exhaust action. The spring 65, sleeved on the second support rod 63 and abutting between the first support rod 62 and the floating plate 64, enables constant-pressure automatic exhaust. Multiple exhaust holes 61 increase the exhaust flow area, allowing gas to be discharged simultaneously from multiple directions, resulting in higher exhaust efficiency and avoiding the risk of exhaust function loss due to blockage of a single exhaust hole 61.

[0033] In one embodiment, such as Figures 4 to 5 As shown, the filter assembly includes: a filter tube 4, a first flange 41, and a second flange 31. There are two first flanges 41, which are respectively located at both ends of the filter tube 4. The first flanges 41 can be detachably connected to the filter tube 4, or can be directly fixed to the filter tube 4 by welding or other methods. The filter tube 4 is provided with a filter plate 42 for intercepting impurities.

[0034] Both first flanges 41 are equipped with sealing rings 7 on their outer sides. The sealing rings 7 are coaxially arranged with the corresponding first flanges 41. Specifically, the sealing ring 7 is located on the outer side of the first flange 41 closest to the water pump 1, away from the secondary network return water main 3. A sealing groove 8 is opened on the input end of the water pump 1 corresponding to the sealing ring 7, and the sealing ring 7 is fitted into the sealing groove 8 of the water pump 1. The sealing ring 7 is also located on the outer side of the first flange 41 closest to the secondary network return water main 3, away from the water pump 1. A second flange 31 is located on the end of the secondary network return water main 3 closest to the water pump 1. A sealing groove 8 is opened on the second flange 31 corresponding to the first flange 41 away from the water pump 1, and the sealing ring 7 is fitted into the sealing groove 8 of the second flange 31. This improves the sealing performance of the filter pipe 4 installation.

[0035] Multiple sets of bolts 9 are movably installed on the first flange 41 near the secondary network return water main 3. The second flange 31 has multiple sets of through holes corresponding to these bolts 9. After passing through these holes, the bolts 9 are secured with hand-tightened nuts 10, enabling a detachable connection between the secondary network return water main 3 and the filter pipe 4. Similarly, multiple sets of bolts 9 are movably installed on the first flange 41 near the water pump 1. The water pump 1 has multiple threaded holes corresponding to these bolts 9. The bolts 9 are directly threaded onto the left end of the water pump 1, thus enabling a detachable installation between the filter pipe 4 and the water pump 1.

[0036] During filter assembly installation, align the two ends of the filter pipe 4 with the sealing ring 7, respectively, with the second flange 31 at the secondary network return water main 3 and the input end of the water pump 1. Align the sealing ring 7 at the outer end of the first flange 41 with the sealing groove 8 on the second flange 31 and the sealing groove 8 on the water pump 1, and then connect and lock the three together using bolts 9, nuts 10, etc. As the flange connection surfaces are tightened, the sealing ring 7 is pressed into the sealing groove 8, and the sealing ring 7 undergoes elastic deformation, tightly filling the gap between the sealing groove 8 and the sealing ring 7, thereby forming two reliable seals between the filter pipe 4 and the secondary network return water main 3, and between the filter pipe 4 and the water pump 1. During the operation of the heating pump station, hot water flows sequentially through the secondary network return water main 3, the filter pipe 4, and the water pump 1. Due to the locking fit between the sealing ring 7 and the sealing groove 8, hot water leakage from the flange connection is effectively prevented, ensuring the sealing performance of the entire pipeline system.

[0037] When it is necessary to disassemble the filter pipe 4 for cleaning or maintenance, remove the bolts 9 and nuts 10 between the second flange 31 and the first flange 41 to separate the filter pipe 4 from the secondary network return water main pipe 3, and remove the bolts 9 between the first flange 41 and the water pump 1 to separate the filter pipe 4 from the water pump 1. The sealing ring 7 will come out of the sealing groove 8 along with the first flange 41, and the filter pipe 4 can be removed as a whole.

[0038] By setting sealing rings 7 at the outer ends of the first flanges 41 at both ends of the filter pipe 4, and setting sealing grooves 8 at corresponding positions on the second flange 31 and the water pump 1, a seal is formed between the filter pipe 4 and the secondary network return water main pipe 3, and between the filter pipe 4 and the water pump 1, through the locking and engaging of the sealing rings 7 and the sealing grooves 8. Compared with the traditional flat gasket sealing method, the locking structure of the sealing rings 7 and the sealing grooves 8 has a self-positioning function during installation, which can prevent the seal from shifting or falling off during installation, improving the convenience of installation and the reliability of the seal.

[0039] With its detachable connection, this structure allows maintenance personnel to quickly remove the filter tube 4 as a whole without damaging the pipeline, significantly shortening the time required to clean or replace the filter plate 42. It is suitable for maintenance scenarios in centralized heating pump stations where the filter plate 42 needs to be cleaned regularly, and has high practical value.

[0040] In one embodiment, such as Figures 1 to 2As shown, the high-level expansion tank 5 is equipped with support legs 51 at its bottom. Several sets of support legs 51 are provided; in this embodiment, four sets are used to support and fix the high-level expansion tank 5, ensuring it is stably positioned behind the secondary network return water main 3 and is higher than the secondary network return water main 3. An expansion pipe 52 is connected to the lower front end of the high-level expansion tank 5 near the secondary network return water main 3. One end of the expansion pipe 52 is connected to the high-level expansion tank 5, and the other end is connected to the top end of the secondary network return water main 3, forming a water flow path. An overflow pipe 53 is connected to the upper rear end of the high-level expansion tank 5 away from the secondary network return water main 3. A flared cover 54 is installed at the end of the overflow pipe 53 away from the high-level expansion tank 5. The opening of the flared cover 54 is flared, facing the floor drain or drainage location. A level pipe 55 is also provided on the high-level expansion tank 5. The liquid level tube 55 can be a glass liquid level tube 55 or a transparent liquid level tube 55, which is vertically installed on the outside of the high-level expansion tank 5. Its upper and lower ends are respectively connected to the inside of the tank to visually display the water level height in the tank.

[0041] During normal operation of the centralized heating pump station, the circulating water expands in volume due to heating. When the water pressure in the secondary network return main 3 increases, excess water enters the high-level expansion tank 5 through the expansion pipe 52, causing the water level in the tank to rise. Operators can monitor the water level in the tank in real time through the level pipe 55 installed on the high-level expansion tank 5. When the water level in the tank rises to the height of the overflow pipe 53 interface, excess water will automatically be discharged from the overflow pipe 53. The horn cover 54 installed at the outlet of the overflow pipe 53 can diffuse and guide the discharged water flow, allowing it to slowly flow into the floor drain or designated drainage area, preventing water from directly hitting the ground. When the water temperature in the secondary network return main 3 decreases, the water volume shrinks, or a small leak occurs in the system causing the water level to drop, the water in the high-level expansion tank 5 automatically flows back to the secondary network return main 3 through the expansion pipe 52 under the action of gravity, achieving water replenishment and pressure stabilization. Throughout the entire process, the support leg 51 maintains the stable installation of the high-level expansion tank 5.

[0042] By installing support legs 51 at the bottom of the elevated expansion tank 5, the tank can be stably supported above and behind the secondary network return water main 3, ensuring the height difference between the tank and the main 3. This allows for natural gravity-based constant-pressure water replenishment without the need for additional electrical or mechanical pressurization devices. An expansion pipe 52 connected to the top of the secondary network return water main 3 at the lower front end and an overflow pipe 53 at the upper rear end enable automatic reception of thermally expanded water and automatic discharge of excess water. The horn cover 54 increases the outlet cross-sectional area, reduces the water flow impact velocity, and prevents overflow water from splashing directly onto the ground, improving operational safety and site cleanliness. The level pipe 55 on the elevated expansion tank 5 provides a clear and real-time view of the water level inside the tank, allowing operators to monitor system water volume changes promptly, detect anomalies in a timely manner, and facilitate daily inspections and maintenance.

[0043] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A centralized heating pumping station, characterized in that, include: Water pump (1); The water supply main pipe (2) is connected to the outlet end of the water pump (1); The water supply structure includes a secondary network return water main (3) and a filter assembly, wherein the filter assembly is detachably installed between the water pump (1) and the secondary network return water main (3); An elevated expansion tank (5) is located above the secondary network return water main (3) and is connected to the secondary network return water main (3); The water conveying structure also includes an air venting assembly, which is disposed on the upper end face of the secondary network return water main (3) and is used to discharge the accumulated air in the secondary network return water main (3).

2. The centralized heating pumping station according to claim 1, characterized in that, The exhaust assembly includes: The exhaust valve body (6) is installed on the upper end face of the secondary network return water main pipe (3), and an installation cavity connected to the secondary network return water main pipe (3) is provided inside it; An exhaust port (61) is provided on the side wall of the exhaust valve body (6); The first support rod (62) is fixedly installed on the top surface of the mounting cavity, and a sliding groove is provided on the first support rod (62) along the axial direction; The second support rod (63) is slidably fitted into the groove; A floating plate (64) is installed at the end of the second support rod (63) away from the first support rod (62), and the floating plate (64) is slidably and sealingly connected to the side wall of the mounting cavity; The spring (65) is sleeved on the second support rod (63), and its two ends abut against the first support rod (62) and the floating plate (64) respectively.

3. The centralized heating pumping station according to claim 2, characterized in that, The exhaust port (61) is provided in a plurality of manner, and the plurality of exhaust ports (61) are arranged in a ring at intervals on the side wall of the exhaust valve body (6).

4. The centralized heating pumping station according to claim 1, characterized in that, The filter assembly includes: a filter tube (4) and a first flange (41) disposed at both ends of the filter tube (4), and a filter plate (42) is disposed inside the filter tube (4). One end of the filter tube (4) is connected to the water pump (1) via the first flange (41).

5. The centralized heating pumping station according to claim 4, characterized in that, The secondary network return water main (3) is provided with a second flange (31) at one end near the water pump (1); The first flange (41) on the filter pipe (4) near the secondary network return water main pipe (3) cooperates with the second flange (31) to realize the connection between the secondary network return water main pipe (3) and the filter pipe (4).

6. The centralized heating pumping station according to claim 5, characterized in that, A sealing ring (7) is provided at the outer end of the first flange (41) away from the filter tube (4); The second flange (31) and the end of the water pump (1) near the filter pipe (4) are both provided with sealing grooves (8) corresponding to the sealing ring (7); The two sets of sealing rings (7) are respectively fitted into the two sets of sealing grooves (8).

7. The centralized heating pumping station according to claim 1, characterized in that, Also includes: The outrigger (51) is installed at the bottom of the high-level expansion tank (5); The expansion pipe (52) has one end connected to the lower front side of the high-level expansion tank (5) near the secondary network return water main (3), and the other end connected to the top of the secondary network return water main (3). The overflow pipe (53) is connected at one end to the upper rear side of the high-level expansion tank (5) away from the secondary network return water main pipe (3).

8. The centralized heating pumping station according to claim 7, characterized in that, The overflow pipe (53) is equipped with a horn cover (54) at the end away from the high-level expansion tank (5).

9. The centralized heating pumping station according to claim 7, characterized in that, The high-level expansion tank (5) is also equipped with a level pipe (55).

10. The centralized heating pumping station according to claim 1, characterized in that, The water pump (1) is provided with a mounting base (11) at its bottom end.

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