High-lift submersible sewage pump

Abstract

The application discloses a high-lift submersible sewage pump and belongs to the technical field of submersible sewage pumps. The high-lift submersible sewage pump comprises a pump body, a mechanical seal, a motor and an impeller. The motor is located in the pump body and is fixedly connected with the pump body. The impeller is fixedly connected with the pump body. The mechanical seal is located in the pump body. The pump body comprises a pump cavity and a filtering cavity. A backflush pipe is fixedly connected with the pump body. A push disc is vertically and slidingly connected with a shell. A first driving element is installed on the shell and is used for driving the movement of the push disc. A filtering screen is located in the filtering cavity and is fixedly connected with the pump body. A backflush element is installed on the backflush pipe and is used for backflushing the filtering screen. A force storage element is installed on the backflush pipe and is used for increasing the impact force of the backflush element so that the backflush element can better backflush the filtering screen. The application has the beneficial effect of providing a high-lift submersible sewage pump capable of prolonging the service life of a mechanical seal.

Description

Technical Field

[0001] This application relates to the field of submersible sewage pump technology, and more specifically, to a high-lift submersible sewage pump. Background Technology

[0002] High-lift submersible sewage pumps differ from ordinary sewage pumps in that they feature high lift, high static pressure, high flow velocity, strong water pressure impact, and large operating vibration amplitude. High-lift submersible sewage pumps are often used in harsh conditions such as deep drainage, high-drop sewage discharge, industrial wastewater lifting, and deep well drainage, operating for extended periods in environments with high speed, high water pressure, and high-impurity sewage. The mechanical seal, as a core precision protective component, plays a crucial role in isolating sewage, protecting the shaft, and protecting the motor; its protective performance and stability directly determine the overall service life and operational reliability of the pump.

[0003] Existing high-lift submersible sewage pump mechanical seals mostly adopt conventional single or double end-face sealing structures, with inadequate protection systems, making them difficult to adapt to extreme high-lift operating conditions and exhibiting numerous technical defects. Under high-lift conditions, the mechanical seal end-face friction speed is high, continuously generating a large amount of frictional heat. However, traditional structures lack a dedicated active cooling circulation structure, relying solely on the static lubricating oil in the sealing cavity for natural heat dissipation, resulting in extremely poor heat dissipation efficiency. This easily leads to problems such as high-temperature overheating of the end face, deterioration of the lubricating medium, and thermal aging and cracking of the seal components, causing leakage and failure of the mechanical seal, thus resulting in a short service life.

[0004] Therefore, a high-lift submersible sewage pump with increased mechanical seal service life is provided. Summary of the Invention

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] To address the technical problems mentioned in the background section, some embodiments of this application provide a high-lift submersible sewage pump, comprising: a pump body, a mechanical seal, a motor, and an impeller; the motor is located within the pump body and is fixedly connected to the pump body; the impeller is fixedly connected to the pump body; the mechanical seal is located within the pump body; the pump body includes a pump chamber and a filter chamber; a backflush pipe is fixedly connected to the pump body; a push plate is vertically slidably connected to the housing; a first driving member is installed on the housing for driving the movement of the push plate; a filter screen is located within the filter chamber and is fixedly connected to the pump body; and a backflush member... Installed on the backflush pipe for backflushing the filter screen; a accumulator, installed on the backflush pipe to increase the impact force of the backflush component, so that the backflush component can better backflush the filter screen; a second drive component, installed on the backflush pipe, for limiting the accumulator; a cooling plate, fixedly connected to the housing; a cooling pipe, with both ends connected to the cooling plate and the return pipe respectively; wherein, there are multiple backflush pipes; there are multiple backflush components and accumulators; a Doppler ultrasonic flow meter is installed on the filter screen; multiple Doppler ultrasonic flow meters are distributed equidistantly around the circumference of the filter screen.

[0007] The backflush unit delivers water through the cooling pipe to the cooling plate, thereby cooling the lower end of the mechanical seal. Then, the backflush unit delivers flushing water through the backflush pipe to backflush the filter screen, thereby reducing the pressure in the pump chamber and indirectly increasing the protection of the mechanical seal, thus ensuring the service life of the mechanical seal.

[0008] Further, the backflush component includes: a guide ring, fixedly connected to the backflush tube; a flow guide tube, horizontally slidably connected to the guide ring; a baffle, fixedly connected to the flow guide tube; a first spring, sleeved on the flow guide tube, with both ends fixedly connected to the baffle and the guide ring respectively; a connecting disc, fixedly connected to the flow guide ring; and a backflush sleeve, located inside the backflush tube and fixedly connected to the backflush tube; the flow guide tube includes a first through hole; the connecting disc includes a second through hole; and the second through hole communicates with the first through hole.

[0009] Furthermore, the cooling plate is located at the lower end of the mechanical seal; the cooling plate includes a cooling groove; the cooling groove is connected to a cooling pipe; when the second through hole is connected to the connecting pipe, it facilitates cooling of the lower end of the mechanical seal.

[0010] Furthermore, the backflush sleeve includes a backflush hole and a sealing hole; multiple backflush holes and sealing holes are provided; each backflush hole and sealing hole is staggered; when the backflush hole is connected to the second through hole, the flushing water flows sequentially through the first through hole, the second through hole, and the backflush hole to the backflush pipe, thereby flushing the filter screen.

[0011] Furthermore, the energy storage component includes: a limiting post, which is vertically slidably connected to the guide ring; a connecting block, which is fixedly connected to the limiting post; a second spring, whose two ends are respectively fixed to the backflush tube and the connecting block; the guide tube includes a first limiting hole; the first limiting hole is used to limit the limiting post.

[0012] Furthermore, the first limiting hole is provided in multiple locations, which are equidistantly distributed along the axial direction of the guide tube.

[0013] Furthermore, the first driving component is a first electric push rod, the rod body of which is fixed to the pump body, and its piston is fixed to the push plate.

[0014] Furthermore, the second driving component includes a second electric push rod and a driving rod; the rod body of the second electric push rod is fixed to the push plate; the driving rod is fixed to the piston of the second electric push rod; the push plate has a receiving cavity; the receiving cavity is used to receive the second electric push rod.

[0015] Furthermore, the connecting block includes a second limiting hole; the piston of the second electric push rod is inserted into the second limiting hole to fix the connecting block to the push plate.

[0016] Furthermore, the second driving member is provided in multiple parts; they are distributed equidistantly around the circumference of the push plate.

[0017] The beneficial effect of this application is that it provides a high-lift submersible sewage pump with increased service life of the mechanical seal. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0019] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0020] In the attached diagram: Figure 1 This is an overall schematic diagram based on an embodiment of this application; Figure 2 yes Figure 1 The enlarged view of part A mainly shows the structure of the first drive unit and the push plate; Figure 3 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the pump chamber and the filter chamber; Figure 4 yes Figure 3 The enlarged view of part B mainly shows the structure of the cooling pipes and cooling tanks; Figure 5 yes Figure 3 The enlarged view of section C mainly shows the structure of the guide tube and the baffle; Figure 6 yes Figure 5 The enlarged view of part D mainly shows the structure of the second electric push rod and the receiving cavity; Figure 7 This is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the back punch hole; Figure 8 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the closed hole.

[0021] Figure label: 100. High-lift submersible sewage pump; 101. Pump body; 101a. Pump chamber; 101b. Filter chamber; 101c. Fixing plate; 102. Mechanical seal; 103. Motor; 104. Impeller; 105. Backflush pipe; 106. Push plate; 106a. Receiving cavity; 107. Filter screen; 108. Cooling plate; 108a. Cooling tank; 109. Cooling pipe; 110. Guide ring; 111. Flow guide pipe; 111a. First through hole ; 111b, First limiting hole; 112, baffle; 113, first spring; 114, connecting plate; 114a, second through hole; 115, backflush sleeve; 115a, backflush hole; 115b, closed hole; 116, limiting post; 117, connecting block; 117a, second limiting hole; 118, second spring; 119, first driving component; 120, second driving component; 120a, second electric push rod; 120b, driving rod. Detailed Implementation

[0022] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0023] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0024] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0025] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0026] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Reference Figure 1-8 A high-lift submersible sewage pump 100 includes: a pump body 101, a mechanical seal 102, a motor 103, an impeller 104, a backflush pipe 105, a push plate 106, a first drive member 119 for driving the push plate 106 to move, a filter screen 107, a backflush member for backflushing the filter screen 107, a accumulator member for increasing the impact force of the backflush member, a second drive member 120 for limiting the accumulator member, a cooling plate 108, and a cooling pipe 109.

[0028] The motor 103 is located inside the pump body 101 and is fixedly connected to the pump body 101. The impeller 104 is fixedly connected to the pump body 101. The mechanical seal 102 is located inside the pump body 101, which includes a pump chamber 101a and a filter chamber 101b. The backflush pipe 105 is fixedly connected to the pump body 101. The push plate 106 is vertically slidably connected to the housing. Specifically, the push plate 106 moves along the height direction of the body. The first drive member 119 is mounted on the housing and is used to drive the movement of the push plate 106. The filter screen 107 is located inside the filter chamber 101b and is fixedly connected to the pump body 101.

[0029] A accumulator is installed on the backflush pipe 105 to increase the impact force of the backflush component, so that the backflush component can better backflush the filter screen 107. A second drive component 120 is installed on the backflush pipe 105 to limit the accumulator. The cooling plate 108 is fixedly connected to the housing. The two ends of the cooling pipe 109 are connected to the cooling plate 108 and the return pipe, respectively. There are multiple backflush pipes 105, multiple backflush components, and multiple accumulators. A Doppler ultrasonic flow meter (not shown in the figure) is installed on the filter screen 107, and multiple Doppler ultrasonic flow meters are distributed equidistantly around the circumference of the filter screen 107.

[0030] A backflushing component is installed on the backflushing pipe 105 for backflushing the filter screen 107. The backflushing component includes: a guide ring 110, a guide pipe 111, a baffle 112, a first spring 113, a connecting disc 114, and a backflushing sleeve 115. The guide ring 110 is fixedly connected to the backflushing pipe 105. The guide pipe 111 is horizontally slidably connected to the guide ring 110. Specifically, the guide pipe 111 moves axially along the guide ring 110. The baffle 112 is fixedly connected to the guide pipe 111. The first spring 113 is sleeved on the guide pipe 111, with both ends fixedly connected to the baffle 112 and the guide ring 110, respectively.

[0031] The connecting plate 114 is fixedly connected to the guide ring. The backflush sleeve 115 is located inside the backflush tube 105, and the backflush tube 105 is fixedly connected. The guide tube 111 includes a first through hole 111a, and the connecting plate 114 includes a second through hole 114a. The second through hole 114a is an L-shaped hole and communicates with the first through hole 111a. The cooling plate 108 is located at the lower end of the mechanical seal 102. The cooling plate 108 includes a cooling groove 108a, which communicates with the cooling pipe 109. When the second through hole 114a communicates with the connecting pipe, it facilitates cooling of the lower end of the mechanical seal 102. The cooling groove 108a communicates with the pump chamber 101a through a third through hole, which is equipped with a one-way valve (not shown in the figure) to prevent water backflow.

[0032] The backflush sleeve 115 includes a backflush hole 115a and a closed hole 115b. Multiple backflush holes 115a and closed holes 115b are provided, and each backflush hole 115a and closed hole 115b is staggered. The inner diameter of the closed hole 115b is the same as the outer diameter of the connecting plate 114, while the diameter of the backflush hole 115a is larger than the diameter of the closed hole 115b. Water flows sequentially through the first through hole 111a, the second through hole 114a, and the connecting pipe, finally flowing to the cooling tank 108a, thereby cooling the lower end of the mechanical seal 102, increasing the cooling capacity of the mechanical seal 102, and ensuring its service life. Simultaneously, when the pressure in the pump chamber 101a increases, the first spring 113 is compressed, causing the guide pipe 111 to move, positioning the second through hole 114a at the position of the backflush hole 115a. This allows water to flow through the first through hole 111a and the second through hole 114a to the backflush hole 115a, and then through the backflush hole 115a into the backflush pipe 105, thus flushing the filter screen 107 and reducing the pressure in the pump chamber 101a. This indirectly increases the protection of the mechanical seal 102, thereby ensuring its service life.

[0033] The accumulator component is used to increase the impact force of the recoil component. The accumulator component includes: a limiting post 116, a connecting block 117, and a second spring 118. The limiting post 116 is vertically slidably connected to the guide ring 110. Specifically, the limiting post 116 is slidably connected along the height direction of the pump body 101. The connecting block 117 is fixedly connected to the limiting post 116. The two ends of the second spring 118 are respectively fixed to the recoil pipe 105 and the connecting block 117. The guide ring 110 includes a clearance hole for the limiting post 116 to move. The guide tube 111 includes a first limiting hole 111b, which is used to limit the position of the limiting post 116. Multiple first limiting holes 111b are provided, equidistantly distributed along the axial direction of the guide tube 111. The first driving component 119 is a first electric push rod. The rod body of the first electric push rod is fixed to the pump body 101. A fixing plate 101c is provided on one side of the pump body 101, and the rod body of the first electric push rod is fixed to the fixing plate 101c. The piston of the first electric push rod is fixed to the push plate 106. A protective cover (not shown in the figure) is provided on the outside of the first electric push rod, and the protective cover is sealed to the pump body 101 by a sealing ring.

[0034] The second driving member 120 includes a second electric push rod 120a and a driving rod 120b. The rod body of the second electric push rod 120a is fixed to the push plate 106, and the driving rod 120b is fixed to the piston of the second electric push rod 120a. The push plate 106 has a receiving cavity 106a for receiving the second electric push rod 120a. The connecting block 117 includes a second limiting hole 117a. The piston of the second electric push rod 120a is inserted into the second limiting hole 117a to fix the connecting block 117 to the push plate 106. Multiple second driving members 120 are provided, equidistantly distributed around the circumference of the push plate 106. When the Doppler ultrasonic flow meter detects a decrease in the water flow rate through the filter screen 107, the second electric push rod 120a drives the drive rod 120b to move, causing the drive rod 120b to insert into the second limiting hole 117a of the connecting block 117, thereby fixing the connecting block 117 to the push plate 106. Then, the first electric push rod drives the push plate 106 to move, which in turn drives the connecting block 117 to move. The movement of the connecting block 117 then drives the limiting post 116 to move, thereby inserting the limiting post 116 into the first limiting hole 111b of the guide tube 111, thus preventing the second spring 118 from moving due to the pressure in the pump chamber 101a.

[0035] When the filter screen 107 becomes clogged, the pressure in the pump chamber 101a increases. Then, the first electric push rod drives the push plate 106 to move. The movement of the push plate 106 causes the connecting block 117 to move. The movement of the connecting block 117 causes the limiting post 116 to disengage from the second limiting hole 117a. Through pressure accumulation, the restriction on the guide pipe 111 is instantly released. Under the pressure of the pump chamber 101a, the second spring 118 is compressed, thereby increasing the pressure in the pump chamber 101a and the impact force of the water, which flushes the filter screen 107, thus ensuring the cleaning force of the filter screen 107. This ensures that the pressure in the pump chamber 101a will not become too high due to the clogging of the filter screen 107, thereby indirectly increasing the protection of the mechanical seal 102 and ensuring the service life of the mechanical seal 102.

[0036] Working principle: Under normal conditions, the limiting rod of the accumulator is inserted into the first limiting hole 111b of the guide pipe 111, and water passes through the first through hole 111a, the second through hole 114a, and the cooling pipe 109 in sequence (see reference). Figure 5Finally, the fluid flows to the cooling tank 108a, thereby cooling the lower end of the mechanical seal 102, increasing the cooling capacity of the mechanical seal 102, and ensuring the service life of the mechanical seal 102. When the pressure in the pump chamber 101a of the pump body 101 increases due to the blockage of the filter screen 107, the second electric push rod 120a drives the drive rod 120b to move, causing the drive rod 120b to insert into the second limiting hole 117a of the connecting block 117, thereby fixing the connecting block 117 to the push plate 106. Then, the first electric push rod drives the push plate 106 to move, which in turn drives the connecting block 117 to move. The movement of the connecting block 117 drives the limiting post 116 to move, thereby disengaging the limiting post 116 from the first limiting hole 111b. Under the pressure of the pump chamber 101a, the first spring 113 is compressed, and at the same time, the guide pipe 111 moves. The movement of the guide pipe 111 connects the second through hole 114a with the backflush hole 115a. Water flows through the first through hole 111a, the second through hole 114a, and the backflush hole 115a to the backflush pipe 105 (see reference). Figure 7 This allows the filter screen 107 to be flushed.

[0037] When a partial blockage occurs, the flow rate of water through the filter screen 107 is detected using a Doppler ultrasonic flow meter. A decrease in the detected flow rate indicates blockage in that area of ​​the filter screen 107. Correspondingly, the second electric push rod 120a of the backflush pipe 105 drives the drive rod 120b to move. The drive rod 120b inserts into the first limiting hole 111b, and then the first electric push rod drives the push plate 106 to move. The movement of the push plate 106 moves the connecting block 117, which in turn moves the limiting post 116, causing the limiting post 116 to disengage from the first limiting hole 111b. Under the pressure of the pump chamber 101a... This will compress the first spring 113, causing the guide pipe 111 to move. The movement of the guide pipe 111 will drive the connecting plate 114 to move. The movement of the guide pipe 111 will connect the second through hole 114a of the connecting plate 114 with the backflush hole 115a. The connecting plate 114 is located at the backflush hole 115a. The width of the backflush hole 115a is greater than the width of the connecting plate 114. Water flows through the first through hole 111a, the second through hole 114a, and the backflush hole 115a to the backflush pipe 105, thereby opening the corresponding backflush pipe 105. This allows the filter screen 107 to be flushed in the clogged area, thus cleaning the filter screen 107 better.

[0038] Under the pressure of the pump chamber 101a, the guide block will cause the second through hole 114a of the connecting block 117 on one side to move from the backflush hole 115a to the closed hole 115b, thereby closing the second through hole 114a. Then, the first electric push rod drives the push plate 106 to move, and the movement of the push plate 106 drives the connecting block 117 to move. The movement of the connecting block 117 drives the limiting post 116 to insert into the second limiting hole 117a, so that the pump chamber 101a maintains a certain pressure. Then, the first driving member 119 drives the push plate 106 to move, and the movement of the push plate 106 drives the connecting block 117 and the limiting post 116 to move, thereby releasing the pressure on the guide pipe 11. The limitation of 1 causes the guide pipe 111 to move under the pressure of the pump chamber 101a, thereby connecting the second through hole 114a of the connecting block 117 with the backflush hole 115a. This increases the pressure of the pump chamber 101a and the impact force of the water. The water passes through the first through hole 111a, the second through hole 114a, the backflush hole 115a and the backflush pipe 105 to flush the filter screen 107, thereby ensuring the cleaning power of the filter screen 107. This ensures that the pump chamber 101a will not have excessive pressure due to the filter screen 107 being blocked, thereby indirectly increasing the protection of the mechanical seal 102 and ensuring the service life of the mechanical seal 102.

[0039] Under normal conditions, water in the pump chamber 101a flows through the first through hole 111a, the second through hole 114a, the connecting pipe, and the cooling tank 108a to cool the lower end of the mechanical seal 102. When the filter screen 107 becomes clogged, causing an increase in pump pressure, the guide pipe 111 and the connecting plate 114 move, allowing water to flow sequentially through the first through hole 111a, the second through hole 114a, the backflush hole 115a, and the backflush pipe 105 to backflush the filter screen 107. When the connecting plate 114 moves to the closed hole 115b (refer to...), the water flows through the first through hole 111a, the second through hole 114a, the backflush hole 115a, and the backflush pipe 105 to backflush the filter screen 107. Figure 8 The second drive unit 120 moves the push plate to move, which in turn moves the connecting block 117 and the limiting post 116, causing the limiting post 116 to insert into the first limiting hole 111b, thus fixing the guide tube 111 and maintaining pressure in the pump chamber 101a. Then, the second drive unit 120 moves the limiting post 116 into the first limiting hole 111b. Through the pressure maintenance, the water can better impact the filter screen 107, thereby cleaning the filter screen 107 better and preventing the filter screen 107 from clogging the pump chamber 101a. The pressure will continue to increase, which will cause damage to the mechanical seal 102, thus increasing the service life of the mechanical seal 102.

[0040] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A high-lift submersible sewage pump, comprising: The pump body (101), mechanical seal (102), motor (103), and impeller (104) are included; the motor (103) is located inside the pump body (101) and is fixedly connected to the pump body (101); the impeller (104) is fixedly connected to the pump body (101); the mechanical seal (102) is located inside the pump body (101); the pump body (101) includes a pump chamber (101a) and a filter chamber (101b); Its features are: The high-lift submersible sewage pump also includes: The backflush pipe (105) is fixedly connected to the pump body (101); The push plate (106) is vertically slidably connected to the housing; The first drive unit (119) is mounted on the housing and is used to drive the movement of the push plate (106); The filter screen (107) is located inside the filter chamber (101b) and is fixedly connected to the pump body (101); A backflush unit, installed on the backflush pipe (105), is used to backflush the filter screen (107); A power storage component, installed on the backflush pipe (105), is used to increase the impact force of the backflush component so that the backflush component can better backflush the filter screen (107); The second driving component (120) is installed on the recoil tube (105) and is used to limit the power storage component; Cooling tray (108) is fixedly connected to the housing; The cooling pipe (109) is connected at both ends to the cooling plate (108) and the return pipe, respectively; The backflush pipe (105) is provided in multiple ways; the backflush component and the accumulator component are provided in multiple ways; the filter screen (107) is provided with a Doppler ultrasonic flow meter; the Doppler ultrasonic flow meter is provided in multiple ways, and is distributed equidistantly around the circumference of the filter screen (107).

2. The high-lift submersible sewage pump according to claim 1, characterized in that: The recoil component includes: The guide ring (110) is fixedly connected to the backflush tube (105); The guide tube (111) is horizontally slidably connected to the guide ring (110); Baffle (112) is fixedly connected to guide pipe (111); The first spring (113) is sleeved on the guide tube (111) and its two ends are fixedly connected to the baffle (112) and the guide ring (110) respectively; Connecting disc (114) is fixedly connected to the guide ring; The backflush sleeve (115) is located inside the backflush tube (105), and the backflush tube (105) is fixedly connected; The guide tube (111) includes a first through hole (111a); the connecting plate (114) includes a second through hole (114a); the second through hole (114a) communicates with the first through hole (111a).

3. The high-lift submersible sewage pump according to claim 2, characterized in that: The cooling plate (108) is located at the lower end of the mechanical seal (102); The cooling plate (108) includes a cooling groove (108a); the cooling groove (108a) is connected to a cooling pipe (109); when the second through hole (114a) is connected to the connecting pipe, it facilitates cooling of the lower end of the mechanical seal (102).

4. The high-lift submersible sewage pump according to claim 3, characterized in that: The backflush sleeve (115) includes a backflush hole (115a) and a closed hole (115b); multiple backflush holes (115a) and closed holes (115b) are provided; each backflush hole (115a) and closed hole (115b) is staggered; when the backflush hole (115a) is connected to the second through hole (114a), the flushing water flows sequentially through the first through hole (111a), the second through hole (114a), and the backflush hole (115a) to the backflush pipe (105), thereby flushing the filter screen (107).

5. The high-lift submersible sewage pump according to claim 4, characterized in that: The energy storage component includes: The limiting post (116) is vertically slidably connected to the guide ring (110); The connecting block (117) is fixedly connected to the limiting post (116); The second spring (118) is fixed at both ends to the recoil tube (105) and the connecting block (117), respectively; The guide tube (111) includes a first limiting hole (111b); the first limiting hole (111b) is used to limit the limiting post (116).

6. The high-lift submersible sewage pump according to claim 5, characterized in that: The first limiting hole (111b) is provided in multiple ways, and is distributed at equal intervals along the axial direction of the guide tube (111).

7. The high-lift submersible sewage pump according to claim 1, characterized in that: The first driving component (119) is a first electric push rod, the rod body of the first electric push rod is fixed to the pump body (101), and its piston is fixed to the push plate (106).

8. The high-lift submersible sewage pump according to claim 5, characterized in that: The second driving member (120) includes a second electric push rod (120a) and a drive rod (120b); The rod body of the second electric push rod (120a) is fixed to the push plate (106); The drive rod (120b) is fixed to the piston of the second electric push rod (120a); The push plate (106) has a receiving cavity (106a); the receiving cavity (106a) is used to receive the second electric push rod (120a).

9. The high-lift submersible sewage pump according to claim 8, characterized in that: The connecting block (117) includes a second limiting hole (117a); The piston of the second electric push rod (120a) is inserted into the second limiting hole (117a) to fix the connecting block (117) to the push plate (106).

10. The high-lift submersible sewage pump according to claim 9, characterized in that: The second drive member (120) is provided in multiple parts; they are distributed equidistantly around the circumference of the push plate (106).

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