Submersible sewage pump and underground sewage deep extraction system

Abstract

The invention discloses a submersible sewage pump and an underground sewage deep extraction system, and belongs to the technical field of sewage treatment.The submersible sewage pump comprises a pump body, the pump body comprises a water inlet, a suction inlet and a water outlet, a jet orifice, a mixing chamber and a diffusion chamber are arranged in the pump body, and a differential pressure driving mechanism is installed on the pump body; the differential pressure driving mechanism comprises a sealing cylinder and a piston installed in the sealing cylinder, the lower end of the sealing cylinder is communicated with the water inlet through a high-pressure connecting pipe, and the upper end of the sealing cylinder is communicated with the mixing chamber through a low-pressure connecting pipe. The transmission mechanism penetrates through the low-pressure connecting pipe to be connected with the aperture adjusting mechanism, and the piston drives the aperture adjusting mechanism to adjust the aperture of the jet hole through the transmission mechanism. The jet stability of water flow in the pump is guaranteed by adjusting the hole diameter of the jet hole, adjusting power is provided in a differential pressure self-driving mode, an additional driving device is not needed, and the pump is stable, durable and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a submersible sewage pump and an underground sewage deep extraction system. Background Art

[0002] Wastewater treatment refers to the process of subjecting wastewater from households, industries, commerce and other sources to a series of physical, chemical and biological treatments to remove pollutants in the water and make it meet the standards for discharge or reuse. This process is of great significance to environmental protection, water resource reuse and public health. There are many types and objects of wastewater treatment. For example, if underground sewage is discharged directly without treatment, it will cause serious pollution to groundwater bodies, which will in turn affect human health and the ecological environment. And wastewater treatment is not only a need for environmental protection, but also an important way to recycle resources. Through treatment, useful substances in sewage can be recycled and reused.

[0003] Regarding the underground sewage mentioned above, if the sewage treatment equipment is placed directly underground, it is not only inconvenient to operate but also susceptible to corrosion and accelerated aging. Therefore, the traditional way to treat underground sewage is usually to install the treatment equipment on the ground, and then use the sewage pump to pump the underground sewage into the sewage equipment. In order to ensure that the sewage pump is not corroded by sewage, a special pump structure is required to achieve submersible operation. Therefore, the submersible sewage pump is applied. It uses high-speed water flow to generate vacuum to attract, lift and transport liquids or gases. This type of pump usually does not contain moving mechanical parts, such as impellers or pistons, so it is simple to maintain, highly durable, and reduces the corrosion of sewage to it.

[0004] Since the submersible sewage pump uses high-pressure water flow to create a low-pressure environment in the pump body to suck in sewage, the sewage needs to maintain a high-pressure form to be sprayed into the pump body. However, in actual applications, due to the long transportation distance or the unstable power of the pre-pump that provides the water pressure, the water pressure entering the submersible sewage pump will also become unstable. If the aperture of the jet port of the submersible sewage pump is always a fixed size, the change in water pressure will cause the water flow ejected from the jet port to be unstable. For example, the water flow pressure is too low, making it difficult to form a low pressure, or the water flow pressure is too high, causing turbulence in the ejected water flow, affecting the transportation of sewage. Especially when working in deep water areas, traditional submersible sewage pumps cannot adjust the aperture size in time according to the water pressure at the water inlet end of the jet port, resulting in poor stability of the water flow injection. Summary of the invention

[0005] The present invention aims to solve the problem that the use stability of the above-mentioned submersible sewage pump is easily affected by the water pressure provided by the front pump, and to provide a submersible sewage pump and an underground sewage deep lifting system, which has the advantages of not being easily affected by the water pressure at the water inlet end, having strong use stability, and having a simple and durable structure.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0007] A submersible sewage pump comprises a pump body, the pump body comprises a water inlet, a suction port and a water outlet, a jet port, a mixing chamber and a diffusion chamber are arranged inside the pump body, a pressure difference driving mechanism is installed on the pump body, the pressure difference driving mechanism comprises a sealing cylinder and a piston installed inside the sealing cylinder, the lower end of the sealing cylinder is connected to the water inlet through a high-pressure connecting pipe, and the upper end is connected to the mixing chamber through a low-pressure connecting pipe, a jet hole is provided at the water outlet end of the jet port, an aperture adjustment mechanism is installed on the jet hole, one end of the piston is connected to a transmission mechanism, the transmission mechanism is connected to the aperture adjustment mechanism through the low-pressure connecting pipe, and the piston drives the aperture adjustment mechanism through the transmission mechanism to adjust the aperture of the jet hole.

[0008] Preferably, the aperture adjustment mechanism includes a baffle covering the surface of the jet hole, the cross-section of the jet hole is a fan-shaped structure, the baffle is connected to a transmission mechanism, and the transmission mechanism drives the baffle to rotate with the center of the fan-shaped structure as a fulcrum, thereby uniformly changing the area of ​​the jet hole covered by the baffle.

[0009] Preferably, the rotatable space of the baffle is located on a side of the jet hole away from the suction port.

[0010] Preferably, the transmission mechanism includes a transmission connecting rod, one end of which is connected to the piston, and the other end is connected to the swing arm through a first rotating shaft, the free end of the swing arm is connected to the baffle through a second rotating shaft, and the connection between the second rotating shaft and the baffle is located on the side away from the fulcrum and close to the jet hole.

[0011] Preferably, the transmission connecting rod and the low-pressure connecting pipe are both inverted U-shaped structures, and the spacing between the upper and lower inner walls of the horizontal section of the low-pressure connecting pipe, the length of the movable space of the piston, and the progress of the up and down movement of the transmission connecting rod are kept consistent.

[0012] Preferably, reinforcing ribs are provided at the connections between the two vertical sections and the horizontal section of the transmission connecting rod, and the reinforcing ribs, the vertical section and the horizontal section form a triangular structure.

[0013] Preferably, the vertical section of the transmission connecting rod is installed inside the vertical section of the low-pressure connecting pipe through a guide member, the transmission connecting rod is slidably connected to the guide member up and down, the guide member includes an outer ring and an inner ring, the outer ring is fixed on the inner wall of the vertical section of the low-pressure connecting pipe, the inner ring is slidably mounted on the outer wall of the vertical section of the transmission connecting rod, the inner ring and the outer ring are connected by a number of support rods, and the intervals between the support rods form through holes.

[0014] Preferably, a protective cover is further provided on the surface of the pump body, and the protective cover covers the outside of the sealing cylinder, the high-pressure connecting pipe and the low-pressure connecting pipe.

[0015] Preferably, the upper and lower ends of the sealing cylinder are provided with connectors with threaded grooves on the outer surface, and the high-pressure connecting pipe and the low-pressure connecting pipe are threadedly connected to the connectors through connecting rings with internal threads installed at the ends. The sealing cylinder is a hollow cylindrical structure composed of a first cylinder body and a second cylinder body.

[0016] In the second aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0017] A deep underground sewage extraction system comprises a submersible sewage pump, a pre-pump and a sewage treatment tank as described in the first aspect, wherein the water inlet of the submersible sewage pump is connected to the water outlet of the pre-pump through a pipeline, the water outlet is connected to the sewage treatment tank through a pipeline, and the water inlet of the pre-pump is also connected to the sewage treatment tank through a pipeline.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The aperture of the jet hole of the jet port is adjusted by the aperture adjustment mechanism. Even if the water pressure at the water inlet end of the jet port changes, it does not affect the stability of the water jetting out of the jet hole. The aperture adjustment mechanism is provided with adjustment power by the pressure difference driving mechanism. The pressure difference driving mechanism changes the position of the piston in the sealing cylinder according to the change of the pressure difference between the water inlet and the mixing chamber, thereby using the movement of the piston to push the aperture adjustment mechanism. The self-adjusting method of the pressure difference driving mechanism does not require the additional power device. Due to its simple structure, it is not easy to be damaged and has a long service life.

[0020] 2. The aperture adjustment mechanism of the present invention utilizes a baffle to adjust the area of ​​the jet hole to achieve aperture adjustment, and the movement mode of the baffle is a rotational mode. Since the water flow in the jet hole impacts the baffle, it will squeeze the baffle and increase the friction of the baffle movement. The use of a rotational mode can effectively reduce the impact of the friction and make the movement of the baffle smoother. The jet hole is designed to have a fan-shaped ring structure in cross section to match the rotatable baffle, and the rotation fulcrum of the baffle coincides with the circle of the fan-shaped ring structure. In this way, when the baffle rotates, the area of ​​the jet hole can change evenly, and the adjustment can be more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the submersible sewage pump of the present invention;

[0022] Figure 2 It is a schematic diagram of the connection structure between the aperture adjustment mechanism and the transmission mechanism of the present invention;

[0023] Figure 3 It is a schematic diagram of the connection structure between the pressure difference driving mechanism and the transmission mechanism of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the guide member of the present invention.

[0025] Figure 5 It is a schematic diagram of the installation structure of the sealing cylinder of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the submersible deep lifting system of the present invention.

[0027] In the figure: 1. pump body, 2. pre-pump, 3. sewage treatment tank, 4. water inlet, 5. suction port, 6. mixing chamber, 7. diffusion chamber, 8. water outlet, 9. jet port, 10. aperture adjustment mechanism, 11. protective cover, 12. pressure difference driving mechanism, 13. transmission connecting rod, 14. first rotating shaft, 15. swing arm, 16. second rotating shaft, 17. shield, 18. support seat, 19. rotating fulcrum, 20. jet hole, 21. sealing cylinder, 22. piston, 23. high-pressure connecting pipe, 24. low-pressure connecting pipe, 25. connecting ring, 26. reinforcing rib, 27. guide, 28. outer ring, 29. inner ring, 30. support rod, 31. first cylinder body, 32. second cylinder body, 33. connector. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] Example 1

[0030] like Figure 1 As shown, a submersible sewage pump is disclosed, including a pump body 1, the pump body 1 includes a water inlet 4, a suction port 5 and a water outlet 8, and a jet port 9, a mixing chamber 6 and a diffusion chamber 7 are arranged inside the pump body 1. The operating principle of the submersible sewage pump is as follows: the high-pressure water flow entering from the water inlet 4 is ejected along the jet port 9, and after passing through the mixing chamber 6, the gas in the mixing chamber 6 is taken out, so that the mixing chamber 6 forms a low-pressure environment, and the sewage is sucked into the mixing chamber 6 through the suction port 5 by using the low pressure and mixed with the water flow of the jet port 9, and finally transported out through the water outlet 8. The suction port 5 is set at an inclined angle, and the angle with the water inlet 4 is an acute angle, so that the sucked sewage will flow along the direction of the jet water flow, increasing the suction force of the submersible sewage pump.

[0031] When the pressure at the water inlet 4 of the existing submersible sewage pump is unstable, the low-pressure environment formed at the jet port 9 will be unstable. Therefore, the following improvements are made to address the above defects: Figure 1 and Figure 3As shown, a pressure differential driving mechanism 12 is installed on the pump body 1, and the pressure differential driving mechanism 12 includes a sealing cylinder 21 and a piston 22 installed inside the sealing cylinder 21. The lower end of the sealing cylinder 21 is connected to the water inlet 4 through a high-pressure connecting pipe 23, and the upper end is connected to the mixing chamber 6 through a low-pressure connecting pipe 24. The water outlet of the jet port 9 is provided with a jet hole 20, and an aperture adjustment mechanism 10 is installed on the jet hole 20. One end of the piston 22 is connected to the transmission mechanism, and the transmission mechanism is connected to the aperture adjustment mechanism 10 through the low-pressure connecting pipe 24. The piston 22 drives the aperture adjustment mechanism 10 to adjust the aperture of the jet hole 20 through the transmission mechanism. Since the submersible sewage pump transports the sucked liquid by forming a negative pressure through a high-pressure water flow, the water pressure of the water inlet 4 will be higher than that of the mixing chamber 6, so the pipe connecting the water inlet 4 is a high-pressure connecting pipe 23. The high-pressure connecting pipe 23 selects the water inlet 4 because the water inlet 4 is close to the jet port 9, and can accurately sense the pressure change at the water inlet end of the jet port 9, reducing the influence of other factors on the water pressure.

[0032] It can be seen from the above that the jet hole 20 of the jet port 9 can be adjusted by the aperture adjustment mechanism 10. When the aperture is reduced, the water pressure of the jet from the jet port 9 will increase. Conversely, when the aperture becomes larger, the water pressure of the jet from the jet port 9 will decrease. The pressure difference driving mechanism 12 is used as the power source of the aperture adjustment mechanism 10. The control principle of the pressure difference driving mechanism 12 is to control the position of the piston 22 in the sealing cylinder 21 by the pressure difference between the water inlet 4 and the mixing chamber 6. The position of the piston 22 changes, thereby driving the transmission mechanism to drive the aperture adjustment mechanism 10 to adjust the aperture, thereby achieving the effect of changing the pressure difference between the water inlet 4 and the mixing chamber 6, and the water pressure of the jet port 9 also changes accordingly, which can ensure that the water flow ejected from the jet port 9 is more stable and the delivery of the inhaled liquid is also more stable. When the aperture of the jet hole 20 is adjusted, it follows the rule that the water pressure at the water inlet 4 increases and the aperture is adjusted to become smaller, and vice versa.

[0033] The pressure difference driving mechanism 12 is actively adjusted according to its own pressure difference, and does not require additional driving force. Even when used in deep water areas, there is no need to worry about the energy supply of the driving force. This self-adjusting method has a simple structure, is worry-free and labor-saving to use, and is not prone to failure.

[0034] like Figure 2 The figure shows a specific display of the aperture adjustment mechanism 10. The aperture adjustment mechanism 10 includes a baffle 17 covering the surface of the jet hole 20. The cross-section of the jet hole 20 is a fan-shaped structure. The baffle 17 is connected to a transmission mechanism. The transmission mechanism drives the baffle 17 to rotate around the center of the fan-shaped structure as a fulcrum, thereby uniformly changing the area of ​​the jet hole 20 covered by the baffle 17.

[0035] In order to enable the baffle 17 to adjust the size of the jet hole 20, the baffle 17 needs to be set to a movable structure. In order to achieve the best shielding effect of the baffle 17, the baffle 17 usually needs to maintain an angle perpendicular to the water flow direction. Then, when the jet hole 20 sprays water, an extrusion force will be applied to the baffle 17. The extrusion force will cause the friction force on the baffle 17 to increase when it moves. Therefore, the movement mode of the baffle 17 is designed to be a rotational motion, so that it is less affected by the friction force and can move easily.

[0036] Although the rotating shutter 17 can reduce the friction effect compared with the traditional vertical and horizontal movement, the adjustment of the size of the jet hole 20 is not linear enough, which will lead to the inaccurate adjustment of the water pressure of the jet hole 20. Figure 2 It can be seen that the cross-section of the jet hole 20 is set to a fan-shaped structure, and the rotation point of the baffle 17 is ensured to coincide with the center of the fan-shaped structure. In this way, when the baffle 17 rotates, the area of ​​the jet hole 20 blocked by the baffle 17 changes evenly, and the adjustment is more precise. The baffle 17 is fixed to the support seat 18 through the rotation fulcrum 19, and the support seat 18 is installed on the outer wall of the jet port 9. The rotation fulcrum 19 coincides with the center of the fan-shaped structure.

[0037] according to Figure 1 It can be seen that the function of the suction port 5 is to suck in sewage. Therefore, after the liquid enters the mixing chamber 6 at the suction port 5, an inhaled water flow will be generated. The inhaled water flow is roughly in the same direction as the jet water flow. In order to reduce the influence of the baffle 17 on the inhaled water flow, the rotatable space of the baffle 17 is located on the side of the jet hole 20 away from the suction port 5. In this way, the baffle 17 is always away from the suction port 5 when rotating, so the inhaled water flow will not contact the baffle 17. In this way, when the baffle 17 is rotated and adjusted, it will not affect the stability of the inhaled water flow.

[0038] according to Figure 3 It can be seen that the piston 22 of the pressure difference driving mechanism 12 moves straight up and down, while the shutter 17 of the aperture adjustment mechanism 10 needs to rotate. In order to ensure that the vertical force can be transmitted to the shutter 17 and converted into a rotating force, the transmission mechanism needs to be set, such as Figure 2 and Figure 3As shown, the transmission mechanism includes a transmission connecting rod 13, one end of the transmission connecting rod 13 is connected to the piston 22, and the other end is connected to the swing arm 15 through the first rotating shaft 14. The free end of the swing arm 15 is connected to the baffle 17 through the second rotating shaft 16, and the connection between the second rotating shaft 16 and the baffle 17 is located on the side away from the fulcrum and close to the jet hole 20. The movement direction of the transmission connecting rod 13 is consistent with that of the piston 22, both are straight up and down. The transmission connecting rod 13 is connected to the baffle 17 through the swing arm 15. Since both ends of the swing arm 15 are rotating shafts, the swing arm 15 will be pushed to move up and down and swing as the transmission connecting rod 13 moves up and down. At this time, the swing trajectory of the connection between the swing arm 15 and the baffle 17 is the rotation trajectory of the baffle 17, so that the baffle 17 can rotate to adjust the aperture of the jet hole 20.

[0039] From the above, it can be known that the baffle 17 will be impacted by the water flow from the jet hole 20. If the impact force of the water flow is borne only by the rotating fulcrum 19 used for fixing, the stability of the installation of the baffle 17 will deteriorate, and the connection position between the second rotating shaft 16 and the baffle 17 does not affect the rotation of the driving baffle 17. Therefore, the connection between the second rotating shaft 16 and the baffle 17 is located on the side away from the fulcrum and close to the jet hole 20, the second rotating shaft 16 is close to the edge of the baffle 17, and the distance between the second rotating shaft 16 and the rotating fulcrum 19 is relatively far, so that the impact force will be partially absorbed by the swing arm 15 and the transmission connecting rod 13, thereby reducing the impact force on the rotating fulcrum 19 and improving the service life of the aperture adjustment mechanism 10.

[0040] like Figure 3 As shown, the transmission connecting rod 13 and the low-pressure connecting pipe 24 are both inverted U-shaped structures, and the spacing between the upper and lower inner walls of the horizontal section of the low-pressure connecting pipe 24, the length of the movable space of the piston 22, and the progress of the up and down movement of the transmission connecting rod 13 are kept consistent. The inverted U-shaped structure can reduce the longitudinal dimension of the transmission mechanism while ensuring the synchronization of the movement directions of the transmission connecting rod 13 and the piston 22, so that the structure composed of the pressure difference driving mechanism 12 and the transmission mechanism is more compact.

[0041] Since the transmission connecting rod 13 and the low-pressure connecting pipe 24 are both inverted U-shaped structures, they both include three parts: a horizontal section and two vertical sections. After the transmission connecting rod 13 is connected to the piston 22, the up and down movement of the piston 22 will drive the vertical and horizontal sections of the transmission connecting rod 13 to move up and down. The transmission connecting rod 13 passes through the low-pressure connecting pipe 24. Therefore, the width of the horizontal section of the low-pressure connecting pipe 24 needs to be set larger, sufficient for the horizontal section of the transmission connecting rod 13 to move. The spacing between the upper and lower inner walls of the horizontal section of the low-pressure connecting pipe 24, the length of the movable space of the piston 22, and the up and down movement progress of the transmission connecting rod 13 are kept consistent, which can play a certain limiting role, limit the movement progress of the transmission connecting rod 13, indirectly limit the rotation angle of the baffle 17, and effectively ensure that the adjustment of the aperture of the jet hole 20 will not be excessive.

[0042] Since the transmission connecting rod 13 is an inverted U-shaped structure, the left and right vertical sections of the horizontal section need to ensure synchronization of movement so that they can be consistent with the piston 22, such as Figure 3 As shown, the horizontal section of the transmission connecting rod 13 has a certain distance, and the horizontal section is inside the low-pressure connecting pipe 24. In this way, when working, the low-pressure connecting pipe 24 is filled with liquid, and the horizontal section will be subject to certain resistance when moving up and down. In order to prevent the deformation of the horizontal section caused by resistance, the connection between the two vertical sections of the transmission connecting rod 13 and the horizontal section is provided with reinforcing ribs 26, and the reinforcing ribs 26, the vertical section and the horizontal section form a triangular structure. The connection between the vertical section and the horizontal section is reinforced by the reinforcing ribs 26, so that when the left vertical section moves with the piston 22, the right vertical section can be driven by the horizontal section to move synchronously, and the movement process is ensured to be consistent.

[0043] In order to further improve the stability of the movement of the transmission connecting rod 13, as Figure 3 and Figure 4 As shown, the vertical section of the transmission link 13 is installed inside the vertical section of the low-pressure connecting pipe 24 through a guide member 27. The transmission link 13 is slidably connected to the guide member 27 up and down. The guide member 27 includes an outer ring 28 and an inner ring 29. The outer ring 28 is fixed on the inner wall of the vertical section of the low-pressure connecting pipe 24. The inner ring 29 is slidably mounted on the outer wall of the vertical section of the transmission link 13. The inner ring 29 and the outer ring 28 are connected by a plurality of support rods 30, and the intervals between the support rods 30 form through holes.

[0044] The guide member 27 is used to guide the stability of the vertical section of the transmission connecting rod 13 in moving up and down, and the structure of the guide member 27 adopts the structure of an outer ring 28 and an inner ring 29. The sliding connection between the inner ring 29 and the vertical section makes the vertical section of the transmission connecting rod 13 move up and down more smoothly, and the outer ring 28 is used to fix the entire guide member 27 on the inner wall of the vertical section of the low-pressure connecting pipe 24. The inner ring 29 and the outer ring 28 are connected by support rods 30, and the through holes formed between the support rods 30 are used to facilitate the passage of liquid.

[0045] Since the submersible sewage pump is used inside the sewage, the differential pressure mechanism 12 is directly exposed to the outside and is easily corroded. As an important component of the self-regulation, the differential pressure mechanism 12 will directly affect the adjustment of the aperture of the jet hole 20 after damage. In order to ensure the stability of the differential pressure mechanism 12, Figure 1 As shown, a protective cover 11 is also provided on the surface of the pump body 1, and the protective cover 11 covers the outside of the sealing cylinder 21, the high-pressure connecting pipe 23 and the low-pressure connecting pipe 24. The transmission connecting rod 13 passes through the inside of the low-pressure connecting pipe 24. In this way, the transmission connecting rod 13 can be protected by the low-pressure connecting pipe 24, and the low-pressure connecting pipe 24 can be designed to be welded on the outer wall of the pump body 1 and connected to the mixing chamber 6, thereby increasing the sealing performance of the pump body 1.

[0046] like Figure 5 As shown, both upper and lower ends of the sealing cylinder 21 are provided with connectors 33 with threaded grooves on the outer surface, and the high-pressure connecting pipe 23 and the low-pressure connecting pipe 24 are threadedly connected to the connector 33 through the connecting ring 25 with internal threads installed at the end, and the sealing cylinder 21 is a hollow cylindrical structure composed of the first cylinder body 31 and the second cylinder body 32. The sealing cylinder 21 is connected to the high-pressure connecting pipe 23 and the low-pressure connecting pipe 24 by threading, which is convenient for disassembly and installation, and the sealing cylinder 21 itself is also composed of the first cylinder body 31 and the second cylinder body 32. Therefore, even if the piston 22 fails, it is convenient to disassemble it for inspection and replacement. Whether it is the threaded connection method or the splicing method, a sealing ring needs to be set at the connection to improve the air tightness of the sealing cylinder 21.

[0047] Example 2

[0048] like Figure 6 As shown, a system for deep extraction of underground sewage includes a submersible sewage pump, a pre-pump 2 and a sewage treatment tank 3 as in Example 1, the water inlet 4 of the submersible sewage pump is connected to the water outlet of the pre-pump 2 through a pipeline, the water outlet 8 is connected to the sewage treatment tank 3 through a pipeline, and the water inlet of the pre-pump 2 is also connected to the sewage treatment tank 3 through a pipeline. When the system is in use, the submersible sewage pump is placed in the underground sewage, and the pre-pump 2 is used to extract sewage or other water in the sewage treatment tank 3 as input power, which is input into the water inlet 4 of the submersible sewage pump, and the suction port 5 of the submersible sewage pump sucks the sewage in the deep water area, and finally flows into the sewage treatment tank 3 through the water outlet 8, completing the transfer of water in the deep water area. The pre-pump 2 here can also not use the sewage treatment tank 3 to pump water, and can directly draw water from the deep water area. The pre-pump 2 only needs to ensure that the water outlet is connected to the water inlet 4 of the submersible sewage pump, so there is no limitation on the water intake method of the pre-pump 2.

[0049] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A submersible sewage pump, comprising a pump body (1), wherein the pump body (1) comprises a water inlet (4), a suction port (5) and a water outlet (8), wherein a jet port (9), a mixing chamber (6) and a diffusion chamber (7) are arranged inside the pump body (1), and wherein: A pressure differential driving mechanism (12) is installed on the pump body (1), and the pressure differential driving mechanism (12) comprises a sealing cylinder (21) and a piston (22) installed inside the sealing cylinder (21); the lower end of the sealing cylinder (21) is connected to the water inlet (4) through a high-pressure connecting pipe (23), and the upper end is connected to the mixing chamber (6) through a low-pressure connecting pipe (24); a jet hole (20) is provided at the water outlet end of the jet port (9), and an aperture adjustment mechanism (10) is installed on the jet hole (20); one end of the piston (22) is connected to a transmission mechanism, and the transmission mechanism is connected to the aperture adjustment mechanism (10) through the low-pressure connecting pipe (24); the piston (22) drives the aperture adjustment mechanism (10) through the transmission mechanism to adjust the aperture of the jet hole (20).

2. A submersible sewage pump according to claim 1, characterized in that: The aperture adjustment mechanism (10) comprises a shield plate (17) covering the surface of the jet hole (20); the cross section of the jet hole (20) is a fan-shaped ring structure; the shield plate (17) is connected to a transmission mechanism; the transmission mechanism drives the shield plate (17) to rotate with the center of the fan-shaped ring structure as a fulcrum, thereby uniformly changing the area of ​​the jet hole (20) covered by the shield plate (17).

3. A submersible sewage pump according to claim 2, characterized in that: The rotatable space of the baffle (17) is located on a side of the jet hole (20) away from the suction port (5).

4. A submersible sewage pump according to claim 2, characterized in that: The transmission mechanism comprises a transmission connecting rod (13), one end of the transmission connecting rod (13) is connected to the piston (22), and the other end is connected to the swing arm (15) via a first rotating shaft (14), the free end of the swing arm (15) is connected to the baffle (17) via a second rotating shaft (16), and the connection between the second rotating shaft (16) and the baffle (17) is located on a side away from the fulcrum and close to the jet hole (20).

5. A submersible sewage pump according to claim 4, characterized in that: The transmission connecting rod (13) and the low-pressure connecting pipe (24) are both inverted U-shaped structures, and the spacing between the upper and lower inner walls of the horizontal section of the low-pressure connecting pipe (24), the length of the movable space of the piston (22), and the progress of the up and down movement of the transmission connecting rod (13) are kept consistent.

6. A submersible sewage pump according to claim 5, characterized in that: Reinforcing ribs (26) are provided at the connection points between the two vertical sections and the horizontal section of the transmission connecting rod (13), and the reinforcing ribs (26), the vertical section and the horizontal section form a triangular structure.

7. A submersible sewage pump according to claim 6, characterized in that: The vertical section of the transmission connecting rod (13) is installed inside the vertical section of the low-pressure connecting pipe (24) through a guide member (27). The transmission connecting rod (13) is slidably connected to the guide member (27) up and down. The guide member (27) comprises an outer ring (28) and an inner ring (29). The outer ring (28) is fixed on the inner wall of the vertical section of the low-pressure connecting pipe (24). The inner ring (29) is slidably mounted on the outer wall of the vertical section of the transmission connecting rod (13). The inner ring (29) and the outer ring (28) are connected by a plurality of support rods (30). The intervals between the support rods (30) form through holes.

8. A submersible sewage pump according to claim 1, characterized in that: A protective cover (11) is also provided on the surface of the pump body (1), and the protective cover (11) covers the outside of the sealing cylinder (21), the high-pressure connecting pipe (23) and the low-pressure connecting pipe (24).

9. A submersible sewage pump according to claim 1, characterized in that: The upper and lower ends of the sealing cylinder (21) are both provided with connectors (33) with thread grooves on the outer surface; the high-pressure connecting pipe (23) and the low-pressure connecting pipe (24) are both threadedly connected to the connector (33) via connecting rings (25) with internal threads installed at the ends; the sealing cylinder (21) is a hollow columnar structure composed of a first cylinder body (31) and a second cylinder body (32) spliced ​​together.

10. An underground sewage deep extraction system, characterized in that: It comprises a submersible sewage pump, a pre-pump (2) and a sewage treatment tank (3) as described in any one of claims 1 to 9, wherein the water inlet (4) of the submersible sewage pump is connected to the water outlet of the pre-pump (2) via a pipeline, the water outlet (8) is connected to the sewage treatment tank (3) via a pipeline, and the water inlet of the pre-pump (2) is also connected to the sewage treatment tank (3) via a pipeline.

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