Anti-blocking vacuum crushing sewage pump

Abstract

The invention discloses an anti-blocking type vacuum smashing sewage pump, and relates to the technical field of sewage pumps, the anti-blocking type vacuum smashing sewage pump comprises a motor, one end of the motor is fixedly connected with a sewage pump shell, the side, away from the motor, of the sewage pump shell is fixedly connected with a communicating shell, and the side, away from the sewage pump shell, of the communicating shell is fixedly connected with a sewage inlet pump shell; a sewage inlet hole is formed in the middle of one side, close to the communicating shell, of the sewage inlet pump shell; an arc-shaped frame is arranged at the bottom of an inner cavity of the sewage inlet pump shell, sliding grooves are formed in the two sides of the arc-shaped frame, sliding strips are arranged in the two sliding grooves in a sliding fit mode, and the two sliding strips are correspondingly and fixedly connected to the two sides of the inner cavity of the sewage inlet pump shell. When the sundries rotate, the sundries continuously collide with the blades in the sewage pump shell, on one hand, smashing can be assisted, so that the overall smashing effect is improved, on the other hand, the dense blade arrays have the hooking and dragging effect on the sundries, and therefore the situation that in the prior art, the sundries are prone to winding a rotary tool bit, the rotary tool bit is completely clamped, and then dead halt is caused is avoided; and the anti-blocking capability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage pumps, in particular to an anti-blocking vacuum crushing sewage pump. Background Art

[0002] The anti-blocking vacuum crushing sewage pump is a special sewage discharge equipment designed for treating high-concentration sewage, feces, and mixed fluids of debris. Its core function is to crush solid impurities in sewage, such as feces, paper towels, and plastic fragments, into fine particles through a built-in crushing mechanism, thereby reducing fluid viscosity, improving pumping capacity, and avoiding the problem of traditional sewage pumps being blocked due to entanglement of hair, fibers, solid particles, etc.

[0003] In the existing technology, the built-in crushing mechanism includes a moving cutter head driven by a motor and a fixed cutter head installed on the pump casing. When sewage enters the pump through the gap between the two, the crushing effect is achieved through the shear force between the two. However, due to human factors, there may be extreme cases where towels and other difficult-to-crush debris appear in the sewage. When they are sucked into the sewage pump, due to the single crushing method, the moving cutter head is easily entangled, which eventually causes the sewage pump to get stuck.

[0004] In order to solve the above problems, an anti-blocking vacuum crushing sewage pump is proposed. Summary of the Invention

[0005] In order to solve the above technical problems, an anti-blocking vacuum crushing sewage pump is provided. This technical solution solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention can be implemented by adopting the following technical solutions: The present invention provides an anti-blocking vacuum crushing sewage pump, comprising a motor, one end of the motor being fixedly connected to a sewage pump housing, a side of the sewage pump housing away from the motor being fixedly connected to a connecting housing, a side of the connecting housing away from the sewage pump housing being fixedly connected to a sewage inlet pump housing, and a sewage inlet hole being formed in the middle of a side of the sewage inlet pump housing close to the connecting housing; An arc-shaped frame is provided at the bottom of the inner cavity of the sewage inlet pump housing, and slide grooves are provided on both sides of the arc-shaped frame. Slide strips are slidably fitted inside the two slide grooves, and the two slide strips are fixedly connected to the two sides of the inner cavity of the sewage inlet pump housing. A plurality of cavities are evenly provided inside the arc-shaped frame, and the cavity opening of each cavity near the center of the sewage inlet pump housing is smaller than the cavity opening away from the center of the sewage inlet pump housing. A base is interference fit inside each cavity, and two parallel blades are fixedly connected to the side of each base near the center of the sewage inlet pump housing, one of which is at the end of the base near the sewage inlet hole, and the other is at the end of the base away from the sewage inlet hole. Each blade has a certain angle a with the axial line of the sewage inlet hole, and each blade has a certain angle b with the tangent line of the arc-shaped frame.

[0007] Furthermore, the external rotation of the motor's drive shaft is connected to the center of one side of the sewage pump housing close to the motor. The motor's drive shaft is fixedly connected to a coupling. The coupling is located inside the sewage pump housing. The end of the coupling away from the motor is fixedly connected to the main shaft. The end of the main shaft away from the coupling is fixedly connected to a rotating cutter head. The inner ring of the sewage inlet hole is fixedly connected to the fixed cutter head. The rotating cutter head is fitted at the center of the inner ring of the fixed cutter head.

[0008] Furthermore, a sewage flow limiting plate is fixedly connected to the inside of the connecting shell near the sewage pump shell, and a flow limiting hole is opened in the middle of the sewage flow limiting plate. The end of the main shaft away from the coupling passes through the flow limiting hole and is located at the bottom edge of the flow limiting hole. A spiral worm gear is fixedly connected to the outside of the main shaft, and the spiral worm gear is located inside the connecting shell.

[0009] Furthermore, a sewage outlet is provided on the top of the sewage pump housing.

[0010] Furthermore, a sewage inlet pipe is fixedly installed on the top of the sewage inlet pump housing, and a bottom end of the sewage inlet pipe extends to the interior of the sewage inlet pump housing.

[0011] Furthermore, a clamp is fixedly installed on the outside of the bottom port of the sewage inlet pipe, and a one-way sealing rubber valve plate is fixedly installed below one side of the clamp, and the upper surface of the one-way sealing rubber valve plate contacts the bottom port of the sewage inlet pipe.

[0012] Furthermore, a sealing cover is fixedly connected to the side of the sewage pump housing away from the connecting shell, and a sealing gasket is provided between the sealing cover and the sewage pump housing. A transparent sight glass is fixedly connected to the middle of the sealing cover, and the side of the sealing cover close to the sewage inlet hole abuts against the side of the arc frame away from the sewage inlet hole.

[0013] As described above, the anti-blocking vacuum crushing sewage pump in the present invention has the following characteristics and advantages: Towel debris is thrown to the edge by the water flow and continuously hits the blade. During the collision, on the one hand, the blade cuts the towel, thereby assisting in crushing and improving the overall crushing effect. On the other hand, when the towel continuously hits, the dense array of blades will have a hooking and pulling effect on the towel. In this way, when the towel is sucked into the pump, it will be prevented from being completely twisted between the rotating cutter head and the fixed cutter head under the traction of the blade. Ultimately, under the dual effects of improving the crushing efficiency and preventing the debris from being completely entangled with the rotating cutter head, the problem in the prior art that when the towel debris is sucked into the sewage pump, the rotating cutter head is easily entangled due to the single crushing means, which eventually causes the sewage pump to be blocked is avoided, thereby improving the anti-blocking ability.

[0014] After the sewage enters the sewage inlet pump casing, it will move toward the sewage inlet hole while rotating with the axial line of the sewage inlet hole as the axis and the rotation direction of the rotating cutter head as the rotation direction. In this sewage pump, a certain angle a is set between the blade and the axial line of the sewage inlet hole. By setting a suitable angle a, the deflection position of the blade fits the angle of the water flow, thereby achieving the effect of guiding the sewage to form a vortex more easily, thereby improving the efficiency of passing through the sewage inlet hole.

[0015] The debris is driven by the sewage vortex to rotate rapidly in the sewage pump housing. In order to improve the efficiency of the debris hitting the top edge of the blade, in this sewage pump, a certain angle b is set between the blade and the outer tangent of the arc frame. Under the design of the blade tilted at a certain angle, its blade part will tilt to better face the rotating debris, thereby achieving the effect of improving the blade's cutting efficiency on debris.

[0016] When the sewage pump housing is blocked, the interior of the sewage pump housing can be exposed by removing the sealing cover, and then the arc frame can be taken out along the direction of the slide groove and the slide bar. Since the cramped space inside the sewage pump housing is left, it is convenient to remove debris. In addition, since each blade is assembled through a separate base and cavity, only the damaged blade can be replaced, which to a certain extent reduces the equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Another perspective diagram of the structure; Figure 3 for Figure 1 Side view of the mid-structure; Figure 4 This is a schematic diagram of the assembly of the motor, main shaft, and spiral worm gear shown in the present invention; Figure 5 It is a schematic diagram of the assembly between the sewage pump housing, the connecting housing and the sewage pump housing shown in the present invention; Figure 6 for Figure 5 Schematic diagram of the decomposition of the middle part structure; Figure 7 for Figure 6 Schematic diagram of the decomposition of the middle part structure; Figure 8 for Figure 7 Schematic diagram of the decomposition of the middle part structure; Fig. 9 for Figure 8 Schematic diagram of the middle part structure; Figure 10 for Fig. 9 Schematic diagram of the decomposition of the middle part structure; Fig.11 is Figure 10 a schematic diagram of the decomposition of some structures in Figure 12 is Fig.11 a schematic diagram of the decomposition of some structures in Fig.13 is Figure 12 a schematic diagram of the decomposition of some structures in Figure 14 is a schematic diagram of the arc-shaped frame structure shown in the present invention; Figure 15 is a schematic diagram of the base and blade structures shown in the present invention; Figure 16 is a schematic diagram of the structure of the arc-shaped frame shown in the present invention fitted in the sewage inlet pump housing; Figure 17 is a schematic diagram of the angle a between the blade and the axial line of the sewage inlet hole shown in the present invention; Fig.18 is a schematic diagram of the angle b between the blade and the outer tangent of the arc-shaped frame shown in the present invention.

[0018] Among them, the reference numerals in the present invention are: 1. Motor; 2. Sewage pump housing; 201. Sewage outlet; 3. Connecting housing; 4. Sewage inlet pump housing; 401. Sewage inlet hole; 5. Coupling; 6. Main shaft; 7. Spiral worm gear; 8. Rotating cutter head; 9. Sewage flow-limiting plate; 901. Flow-limiting hole; 10. Fixed cutter head; 11. Sewage inlet pipe; 12. Hoop; 13. One-way sealing rubber valve plate; 14. Sealing cover; 15. Transparent sight glass; 16. Sealing gasket; 17. Arc-shaped frame; 18. Cavity; 19. Base; 20. Blade; 21. Slide groove; 22. Slide bar. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Refer to Figures 1-18 shown, which is an embodiment of the present invention, and a kind of anti-blocking vacuum pulverizing sewage pump provided will be elaborated in detail below: An anti-blocking vacuum pulverizing sewage pump includes a motor 1. Refer to Figures 1-12As shown, one end of the motor 1 is fixedly connected to the sewage pump housing 2, and a sewage outlet 201 is provided on the top of the sewage pump housing 2. The side of the sewage pump housing 2 away from the motor 1 is fixedly connected to the connecting housing 3, and the side of the connecting housing 3 away from the sewage pump housing 2 is fixedly connected to the sewage inlet pump housing 4. A sewage inlet hole 401 is provided in the middle of the side of the sewage inlet pump housing 4 close to the connecting housing 3.

[0021] See Figure 4-12 As shown, the external rotation of the drive shaft of the motor 1 is connected to the center of the side of the sewage pump housing 2 close to the motor 1, and the drive shaft of the motor 1 is fixedly connected to the coupling 5. The coupling 5 is inside the sewage pump housing 2, and the end of the coupling 5 away from the motor 1 is fixedly connected to the main shaft 6. The end of the main shaft 6 away from the coupling 5 is fixedly connected to the rotating cutter head 8. The inner ring of the sewage inlet hole 401 is fixedly connected to the fixed cutter head 10, and the rotating cutter head 8 is fitted at the center of the inner ring of the fixed cutter head 10.

[0022] A sewage flow limiting plate 9 is fixedly connected to the inside of the connecting shell 3 on one side close to the sewage pump shell 2. A flow limiting hole 901 is opened in the middle of the sewage flow limiting plate 9. The end of the main shaft 6 away from the coupling 5 passes through the flow limiting hole 901 and is located at the bottom edge of the flow limiting hole 901. A spiral worm gear 7 is fixedly connected to the outside of the main shaft 6, and the spiral worm gear 7 is located inside the connecting shell 3.

[0023] See Figures 12-18 As shown, an arc-shaped frame 17 is provided at the bottom of the inner cavity of the sewage inlet pump housing 4, and a slide groove 21 is provided on both sides of the arc-shaped frame 17. The inside of the two slide grooves 21 are slidably fitted with a slide bar 22, and the two slide bars 22 are fixedly connected to the two sides of the inner cavity of the sewage inlet pump housing 4. A plurality of cavities 18 are evenly provided inside the arc-shaped frame 17, and the cavity opening of each cavity 18 near the center of the sewage inlet pump housing 4 is smaller than the cavity opening away from the center of the sewage inlet pump housing 4. The inside of each cavity 18 is interference-fitted with a base 19, and each base 19 is fixedly connected to one side near the center of the sewage inlet pump housing 4 with two parallel blades 20, one of which is at the end of the base 19 near the sewage inlet hole 401, and the other is at the end of the base 19 away from the sewage inlet hole 401. Each blade 20 has a certain angle a with the axial line of the sewage inlet hole 401, and each blade 20 has a certain angle b with the tangent line of the arc-shaped frame 17.

[0024] In this embodiment, after the sewage enters the sewage pump housing 4, when it passes through the sewage inlet hole 401, due to the rotation of the rotating cutter head 8 and the spiral worm gear 7, the sewage passes through in the form of a rotating vortex, the axis of which is the axial line of the sewage inlet hole 401, that is, the sewage rotates while moving toward the sewage inlet hole 401, and the rotation direction of the rotating cutter head 8 is consistent. In this sewage pump, there is a certain angle a between the blade 20 and the axial line of the sewage inlet hole 401. By setting a suitable angle a, the deflection position of the blade 20 fits the angle of the water flow, see Figure 17 As shown, it can guide the sewage to form a vortex more easily, improving the efficiency of passing through the sewage inlet hole.

[0025] Furthermore, when the sundries are driven by the sewage vortex to rotate rapidly in the sewage inlet pump housing 4, in order to improve the efficiency of the sundries hitting the top edge of the blade 20, in this sewage pump, there should be a certain angle b between the blade 20 and the outer tangent of the arc-shaped frame 17. With the design of the blade 20 tilted at a certain angle, its blade part will better face the rotating sundries. Refer to Fig.18 As shown, thereby improving the cutting efficiency of the sundries.

[0026] Furthermore, refer to Figure 11-12 As shown, a sewage inlet pipe 11 is fixedly installed at the top of the sewage inlet pump housing 4, and the bottom port of the sewage inlet pipe 11 extends into the interior of the sewage inlet pump housing 4. A hoop 12 is fixedly installed outside the bottom port of the sewage inlet pipe 11. A one-way sealing rubber valve plate 13 is fixedly installed below one side of the hoop 12, and the upper surface of the one-way sealing rubber valve plate 13 abuts against the bottom port of the sewage inlet pipe 11.

[0027] Furthermore, refer to Figure 10 As shown, a sealing cover 14 is fixedly connected to the side of the sewage inlet pump housing 4 away from the communicating housing 3, and a sealing gasket 16 is provided between the sealing cover 14 and the sewage inlet pump housing 4. A transparent sight glass 15 is fixedly connected to the middle of the sealing cover 14, which is convenient for visual inspection. The side of the sealing cover 14 close to the sewage inlet hole 401 abuts against the side of the arc-shaped frame 17 away from the sewage inlet hole 401, and the abutting force is used to stabilize the arc-shaped frame.

[0028] Combined with the above embodiments, the following is the entire working process and working principle of the above embodiments: Working state: When sewage discharge of the equipment is required, the motor 1 starts, and then drives the main shaft 6 to rotate through the coupling 5. The main shaft 6 drives the spiral worm wheel 7 in the communicating housing 3 to rotate, thereby pushing the sewage inside it through the flow-limiting hole 901 into the interior of the sewage pump housing 2, and then discharging it through the sewage outlet 201. When the sewage in the communicating housing 3 is pumped away, since the sewage inlet pump housing 4 and the communicating housing 3 are connected through the sewage inlet hole 401, a negative pressure will be formed inside the sewage inlet pump housing 4, making the pressure of the sewage in the sewage inlet pipe 11 greater than the pressure inside the sewage inlet pump housing 4. Thus, the sewage in the sewage inlet pipe 11 will, under the pressure difference, flush open the bottom port of the sewage inlet pipe 11 blocked by the one-way sealing rubber valve plate 13, and finally pour into the sewage inlet pump housing 4. And under the continuous rotation of the spiral worm wheel 7, it is sucked into the interior of the communicating housing 3 through the sewage inlet hole 401 and then discharged.

[0029] Among them, the one-way sealing rubber valve plate 13 is elastic and can fit the bottom port of the sewage inlet pipe 11 when it is not subject to external force. When it is subjected to external force, it can undergo elastic deformation to release the blockage of the sewage inlet pipe 11. The sewage specifically passes through the sewage inlet hole 401 through the gap between the rotating cutter head 8 and the fixed cutter head 10.

[0030] In the above sewage discharge process, since the rotating cutter head 8 is driven by the motor 1 through the main shaft 6, it rotates at a high speed at the center of the inner ring of the fixed cutter head 10. When the debris in the sewage passes through the gap between the rotating cutter head 8 and the fixed cutter head 10, it will be crushed by the shear force formed between the two, and finally the debris is crushed and the blockage effect is achieved. After the sewage is discharged, the motor 1 stops working. Since the sewage stops flowing between the sewage inlet pipe 11 and the sewage inlet pump housing 4, the one-way sealing rubber valve plate 13 is no longer affected by external force and returns to its original state under the action of its own elasticity, and the sewage inlet pipe 11 is blocked again, so that the pump and the equipment are isolated, ensuring that the negative pressure will not leak.

[0031] Furthermore, due to human factors, there may be extreme cases where the sewage contains debris that is difficult to crush, such as towels. At this time, if the debris is stuck between the rotating cutter head 8 and the fixed cutter head 10, it will make it difficult for the ordinary sewage pump to fill with water, and eventually lead to poor sewage discharge or even a freeze.

[0032] When the above extreme situation occurs, in this sewage pump, when sewage passes through the sewage inlet hole 401 normally, due to the rotation of the rotating cutter head 8 and the spiral worm gear 7, the sewage passes through in the form of a rotating vortex, the axis of which is the axial line of the sewage inlet hole 401. In this way, the towel debris in the sewage will also be driven by the water flow to rotate rapidly in the sewage inlet pump housing 4. During the rotation process, the towel is thrown to the edge and continuously hits the blade 20. During the collision process, on the one hand, the blade 20 will cut the towel, thereby assisting in crushing, and using pre-crushing to improve the overall crushing effect. On the other hand, since the blade 20 is a multi-blade design, when the towel continuously hits the blade 20, the dense array of blades 20 will have a hooking and pulling effect on the towel. In this way, when part of the towel is sucked into the sewage inlet hole 401, the other part of the towel will be pulled by the blade 20, preventing it from being completely twisted between the rotating cutter head 8 and the fixed cutter head 10, thereby avoiding the rotating cutter head 8 from being completely stuck and causing a crash.

[0033] In the event that the blade 20 is caught by debris and causes the sewage pump housing 4 to be blocked, the interior of the sewage pump housing 4 can be exposed by removing the sealing cover 14. At this time, since the sealing cover 14 no longer interferes with the arc frame 17, the arc frame 17 can be taken out along the direction of the slide groove 21 and the slide bar 22. Since the cramped space inside the sewage pump housing 4 has been left, it is convenient to remove the debris. Furthermore, since each blade 20 is assembled with a separate base 19 and a cavity 18, only the damaged blade 20 can be replaced, which reduces the equipment maintenance cost to a certain extent.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A clogging-proof vacuum pulverizing sewage pump, comprising a motor (1), characterized in that: One end of the motor (1) is fixedly connected to a sewage pump housing (2). On the side of the sewage pump housing (2) away from the motor (1), a connecting housing (3) is fixedly connected. On the side of the connecting housing (3) away from the sewage pump housing (2), a sewage inlet pump housing (4) is fixedly connected. In the middle of the side of the sewage inlet pump housing (4) close to the connecting housing (3), a sewage inlet hole (401) is provided. At the bottom of the inner cavity of the sewage inlet pump housing (4), an arc-shaped frame (17) is provided. On both sides of the arc-shaped frame (17), sliding grooves (21) are provided. Inside both of the two sliding grooves (21), sliding bars (22) are slidably engaged. The two sliding bars (22) are correspondingly fixedly connected to both sides of the inner cavity of the sewage inlet pump housing (4). Inside the arc-shaped frame (17), a plurality of cavities (18) are evenly provided. The orifice of each cavity (18) close to the center of the sewage inlet pump housing (4) is smaller than the orifice of it away from the center of the sewage inlet pump housing (4). Inside each cavity (18), a base (19) is in interference fit. On the side of each base (19) close to the center of the sewage inlet pump housing (4), two parallel blades (20) are fixedly connected. One of them is at one end of the base (19) close to the sewage inlet hole (401), and the other is at one end of the base (19) away from the sewage inlet hole (401). Between each blade (20) and the axial line of the sewage inlet hole (401), there is a certain angle a, and between each blade (20) and the outer tangent of the arc-shaped frame (17), there is a certain angle b.

2. The anti-blocking vacuum crushing sewage pump according to claim 1, characterized in that: The outer part of the drive shaft of the motor (1) is rotatably connected to the center of the side of the sewage pump housing (2) close to the motor (1). The drive shaft of the motor (1) is fixedly connected to a coupling (5). The coupling (5) is inside the sewage pump housing (2). At the end of the coupling (5) away from the motor (1), a main shaft (6) is fixedly connected. At the end of the main shaft (6) away from the coupling (5), a rotary cutter head (8) is fixedly connected. Inside the inner ring of the sewage inlet hole (401), a fixed cutter head (10) is fixedly connected. The rotary cutter head (8) is fitted at the center of the inner ring of the fixed cutter head (10).

3. The anti-blocking vacuum crushing sewage pump according to claim 2, characterized in that: Inside the side of the connecting housing (3) close to the sewage pump housing (2), a sewage discharge limiting plate (9) is fixedly connected. In the middle of the sewage discharge limiting plate (9), a limiting hole (901) is provided. The end of the main shaft (6) away from the coupling (5) passes through the limiting hole (901) and is at the bottom edge of the limiting hole (901). Outside the main shaft (6), a spiral worm wheel (7) is fixedly connected. The spiral worm wheel (7) is inside the connecting housing (3).

4. The anti-blocking vacuum crushing sewage pump according to claim 3, characterized in that: On the top of the sewage pump housing (2), a sewage discharge port (201) is provided.

5. The anti-blocking vacuum crushing sewage pump according to claim 4, characterized in that: On the top of the sewage inlet pump housing (4), a sewage inlet pipe (11) is fixedly installed, and the bottom port of the sewage inlet pipe (11) extends into the interior of the sewage inlet pump housing (4).

6. The anti-blocking vacuum crushing sewage pump according to claim 5, characterized in that: Outside the bottom port of the sewage inlet pipe (11), a hoop (12) is fixedly installed. Below one side of the hoop (12), a one-way sealing rubber valve plate (13) is fixedly installed. The upper surface of the one-way sealing rubber valve plate (13) abuts against the bottom port of the sewage inlet pipe (11).

7. The anti-blocking vacuum crushing sewage pump according to claim 6, characterized in that: A sealing cover (14) is fixedly connected to the side of the sewage inlet pump housing (4) away from the communicating housing (3), and a sealing gasket (16) is provided between the sealing cover (14) and the sewage inlet pump housing (4). A transparent sight glass (15) is fixedly connected to the middle of the sealing cover (14). The side of the sealing cover (14) close to the sewage inlet hole (401) abuts against the side of the arc-shaped frame (17) away from the sewage inlet hole (401).

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