CN106759817B

CN106759817B - Well cover

Info

Publication number: CN106759817B
Application number: CN201710185534.XA
Authority: CN
Inventors: 沈宇杰
Original assignee: Shandong Lurun Plastics Co ltd
Current assignee: Shandong Lurun Plastics Co ltd
Priority date: 2017-03-26
Filing date: 2017-03-26
Publication date: 2022-08-19
Anticipated expiration: 2037-03-26
Also published as: CN106759817A

Abstract

The invention discloses a well lid, which has the technical scheme that the peculiar smell of a sewer is the most severe when the temperature is higher, so that through the principle of thermal expansion and cold contraction, when the temperature is high, air expands to push a first piston body to move and then a drain hole is blocked by a sealing blocking piece, thereby achieving the aim of deodorization, and meanwhile, because the temperature of the well lid is reduced when drainage is needed, the air in a cavity is contracted, so that the drain hole is in a circulation state, and drainage cannot be influenced; meanwhile, in order to prevent the drain hole from being blocked, when a vehicle passes through, the driving mechanism stores high-pressure gas into the gas storage tank, the first drain hole is blocked, and then sundries in the first drain hole are blown by opening the air outlet through the switch mechanism, so that the anti-blocking purpose is achieved. The invention has good deodorization effect and good drainage function and can prevent the drain hole from being blocked.

Description

Well cover

Technical Field

The invention relates to the field of municipal engineering equipment, in particular to a well cover.

Background

When people walk in cities, peculiar smells are often generated, and the peculiar smells not only influence the beauty of the cities, pollute air and are harmful to human bodies, but also influence the mood of the walker. By exploring the source of these odors we know that these odors come from the sewer and escape through the drain opening in the well lid. We therefore need to explore a way to prevent the escape of odors.

For example, a deodorization well lid mentioned in chinese patent with publication number CN202450618U adopts the following technical scheme: the novel water filter comprises a cover body, wherein water filtering holes are annularly distributed in the cover body, an arc-shaped water storage tank is formed by inward rolling and hooking of the edge of the lower end of the cover body, and a deodorization ring extending into the arc-shaped water storage tank is arranged at the center of the lower end of the cover body. The invention forms a deodorization mechanism by the deodorization ring extending into the arc-shaped water storage tank, so that water is always stored in the arc-shaped water storage tank to form water seal, thereby preventing odor or peculiar smell from emitting from a well mouth and achieving the aim of deodorization.

However, the above-mentioned deodorization well lid does not consider the drainage function of the well lid, and the deodorization ring formed by the above-mentioned deodorization well lid is easy to be blocked during the drainage process, thereby reducing the drainage function of the well lid. Therefore, the design of the manhole cover which can prevent odor and blockage is very necessary, and the requirement of environment protection and energy conservation in the current society is met.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the manhole cover which can play a deodorizing effect and has a good anti-blocking effect.

In order to achieve the purpose, the invention provides the following technical scheme: a well lid is installed on a well lid installation seat and comprises a circular well lid body, a plurality of first drainage holes in the vertical direction are uniformly formed in the position, close to the edge, of the well lid body, a cavity is arranged in the well lid body and filled with air, the air in the cavity is at atmospheric pressure at normal temperature, the cavity is uniformly communicated with a plurality of first piston cylinder bodies, the piston cylinder bodies are arranged in the diameter direction of the well lid body, the number of the first piston cylinder bodies is equal to that of the first drainage holes, meanwhile, the first piston cylinder bodies are communicated with the first drainage holes, a first piston body is connected in the first piston cylinder bodies in a sliding and sealing mode, a first clamping table for preventing the piston body from sliding into is arranged on one side, close to the cavity, of each first piston cylinder body, a sealing separation blade for deodorization is arranged on one side, close to each first drainage hole, of each first piston cylinder body, the sealing separation blade is not contacted with the first drainage hole under the normal temperature state, and the sealing separation blade gradually begins to be contacted with the first drainage hole due to air expansion when the temperature is higher than the normal temperature; the first piston cylinder body is provided with a second drain hole and a third drain hole in the vertical direction in the diameter direction, the length of the first piston body is larger than the distance between the second drain hole and the third drain hole, and when the sealing separation blade is in contact with the first drain hole, the second drain hole and the third drain hole are not communicated with the cavity; the center of the well lid body is also provided with an anti-blocking device, and the anti-blocking device comprises a driving mechanism and an anti-blocking mechanism; the driving mechanism comprises a driving post arranged at the center of the well cover body, the upper surface of the driving post is provided with a spherical surface bulge, the lower end of the driving post is connected with a second piston body, the center of the well cover is provided with a second piston cylinder body connected with the second piston body in a sealing sliding manner, the second piston cylinder body is provided with a second clamping table for preventing the second piston body from sliding out, the second piston cylinder body further comprises a cylinder bottom, a first compression spring is arranged between the second piston body and the cylinder bottom, when no automobile passes through the driving mechanism, the upper surface of the driving post is flush with the upper surface of the well cover body, the cylinder bottom is connected with an air inlet one-way valve and an air outlet one-way valve, the air inlet one-way valve is connected with an air inlet channel, the air inlet channel is communicated with the outside, the air outlet one-way valve is connected with a connecting pipe, and the other end of the connecting pipe is connected with an air storage tank, the gas storage tank is also connected with an independent gas outlet channel, a switch mechanism is arranged on the gas outlet channel, and the other end of the gas outlet channel is connected with a blockage clearing mechanism; the switch mechanism comprises a switch tube which is arranged on the same plane with the second drain hole and the third drain hole and is arranged at the position, close to the center of the well cover, of the first piston cylinder body, a switch rod is connected in the switch tube in a sealing sliding mode, the top end of the switch rod is connected with a spherical convex block, a second compression spring is further connected between the bottom of the switch rod and the bottom of the switch tube, the air outlet channel penetrates through the switch tube, a through hole is formed in the switch tube, the convex block extends into the first piston cylinder body when the second compression spring is in a natural state, the air outlet channel is staggered with the through hole, the air outlet channel is closed, and when the first piston body presses the convex block back into the switch tube, the through hole is communicated with the air outlet channel; the length of the first piston body is equal to the distance between the third drain hole and the switch tube; the blockage removing mechanism comprises a blockage removing pipe sleeved in the first drainage pipe, a plurality of blockage removing plates are uniformly arranged on the blockage removing pipe, the blockage removing plates are arranged in an arc shape, a pitted surface is arranged on one side, facing the center, of each blockage removing plate, a pushing mechanism is fixedly connected with the blockage removing pipe and comprises a third piston cylinder body arranged in the well lid body in the vertical direction, a third piston body is connected in the third piston cylinder body in a sealing and sliding mode, a third clamping table for preventing the third piston body from sliding out is arranged on the third piston cylinder body, a third compression spring is arranged between the third piston body and the third clamping table, the third piston body is naturally contacted with the top end of the third piston cylinder body, the top end of the third piston cylinder body is communicated with the air outlet channel, and the lower end of the third piston body is connected with a fixed rod fixedly connected with the blockage removing pipe, and the piston body is internally provided with an air passing hole which is communicated up and down and has the diameter of one tenth of the diameter of the piston body.

By adopting the technical scheme, the peculiar smell of the sewer is considered to be easy to volatilize under the condition of higher temperature, the volatilization is small under the condition of low temperature and is not considered, and the first drainage hole is required to be opened when the water needs to be drained; when water needs to be drained, the temperature of the air in the cavity is reduced due to the temperature of the water, so that the air in the cavity starts to contract to enable the sealing baffle to be far away from the first drain hole, and the first drain hole is in a circulating state, so that water can be drained; when the first water drainage hole is blocked or the flow rate of drainage is larger, the pressure of water on the first piston body is larger than the pressure of air in the cavity on the first piston body, so that the first piston body starts to move, and the second water drainage hole and the third water drainage hole are opened in the moving process, so that the drainage capacity can be larger; when the first drainage hole is blocked, the second drainage hole and the third drainage hole cannot meet the requirement of drainage capacity, the anti-blocking device can clear sundries blocked in the first drainage hole, the first piston body can move due to high water pressure and enables the switching mechanism to be in a communicated state by squeezing the lug, high-pressure air in the air storage tank flows into the third piston cylinder body through the air outlet channel at the moment, the third piston body is driven to move downwards, meanwhile, the blockage removing pipe and the blockage removing plate are driven to move downwards, and one side, close to the center, of the blockage removing plate is provided with a hemp surface, so that the friction force between the blockage removing plate and the sundries is large, the sundries can be driven to move downwards to be discharged in the downward moving process, and the circulation of the first drainage pipe is further guaranteed; the air storage tank is arranged through the driving mechanism, when a vehicle passes through, the tire of the vehicle can generate pressure on the spherical bulge, so that air in the second piston cylinder body can be pressed into the air storage tank through the air outlet one-way valve, and after the tire leaves, the air is sucked into the second piston cylinder body through the air inlet one-way valve under the action of the first spring, so that energy can be collected in a reciprocating manner, and high-pressure air is stored in the air storage tank; to sum up, this well lid has good deodorant effect, can satisfy the demand of big water yield drainage simultaneously to can clear stifled processing automatically when first drainage hole blocks up, it is high-efficient quick, have good social.

The invention is further configured to: fins for increasing the heat exchange area are uniformly arranged in the cavity.

The invention is further configured to: the surface area of the fins is 3-50 square centimeters.

The invention is further configured to: the thickness of the fin is 0.2-10.0 millimeters.

Through adopting above-mentioned technical scheme, the fin can increase the heat transfer area of air and well lid to increase heat exchange efficiency, thereby make the air in the cavity can be very quick change along with ambient temperature's change, be favorable to producing better deodorant effect.

In conclusion, the invention has the following beneficial effects: the invention has good deodorization effect, can meet the requirement of large-water-volume drainage, can automatically clear blockage when the first drainage hole is blocked, is efficient and quick, and has good social significance.

Drawings

Fig. 1 is a schematic overall structure diagram of the embodiment.

Fig. 2 is a schematic view of the internal structure of the embodiment.

Fig. 3 is a partially enlarged view of B in fig. 2.

Fig. 4 is a partially enlarged view of C in fig. 2.

Fig. 5 is a partial enlarged view of D in fig. 2.

In the figure: 1. a well cover mounting seat; 2. a well lid body; 3. a first drain hole; 4. a cavity; 5. air; 6. a first piston cylinder; 7. a first piston body; 8. a first chuck table; 9. sealing the blocking piece; 10. a second drain hole; 11. a third drain hole; 12. a drive column; 13. spherical surface bulges; 14. a second piston body; 15. a second piston cylinder; 16. a second chuck table; 17. a cylinder bottom; 18. a first compression spring; 19. an air inlet check valve; 20. an air outlet one-way valve; 21. an air intake passage; 22. a connecting pipe; 23. a gas storage tank; 24. an air outlet channel; 25. a switching tube; 26. a switch lever; 27. a bump; 28. a second compression spring; 29. a via hole; 30. a fin; 31. clearing the blockage pipe; 32. clearing the blockage; 33. dough milling; 34. a third piston cylinder; 35. a third piston body; 36. a third chuck table; 37. a third compression spring; 38. a fixing rod; 39. and (4) air passing holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment is as follows: the utility model provides a well lid, installs on well lid mount pad 1, as shown in fig. 1 to 5, including circular shape well lid body 2, well lid body 2's the position that is close to the edge evenly is provided with the first drainage hole 3 of a plurality of vertical directions, can drain water well through first drainage hole 3. However, the bad smell of the sewage is volatilized from the first drain hole 3 under the higher temperature condition.

A cavity 4 is arranged in the well lid body 2, and the cavity 4 is filled with air 5. Evenly be provided with the fin 30 that is used for increasing heat transfer area in the cavity 4, fin 30 can increase the heat transfer area of air 5 and well lid to increase heat exchange efficiency, thereby make the change along with ambient temperature's that air 5 in the cavity 4 can be quick, be favorable to producing better deodorant effect. The air 5 in the cavity 4 is atmospheric pressure at normal temperature, the cavity 4 is uniformly communicated with a plurality of first piston cylinder bodies 6, the piston cylinder bodies are arranged in the diameter direction of the well lid body 2, the number of the first piston cylinder bodies 6 is equal to that of the first drainage holes 3, meanwhile, the first piston cylinder bodies 6 are communicated with the first drainage holes 3, the first piston cylinder bodies 6 are connected with first piston bodies 7 in a sliding and sealing mode, one sides, close to the cavity 4, of the first piston cylinder bodies 6 are provided with first clamping platforms 8 for preventing the piston bodies from sliding into, one sides, close to the first drainage holes 3, of the first piston cylinder bodies 6 are provided with sealing separation blades 9 for deodorization, the sealing separation blades 9 are not in contact with the first drainage holes 3 at normal temperature, and the sealing separation blades 9 gradually start to be in contact with the first drainage holes 3 due to expansion of the air 5 when the temperature is higher than the normal temperature.

The peculiar smell of the sewer is easy to volatilize under the condition of higher temperature, and the volatilization is small under the condition of lower temperature. Because the air 5 in the cavity 4 is in a closed space, when the atmospheric temperature is higher, the air 5 in the cavity 4 begins to expand when heated and further pushes the first piston body 7 to move in the first piston cylinder body 6, and then the sealing blocking piece 9 is gradually contacted with the first drainage hole 3, so that the first drainage hole 3 is in a non-circulating state, and the purpose of deodorization is achieved. When water needs to be drained, the temperature of the air 5 in the cavity 4 is reduced due to the temperature of the water, and then the air 5 in the cavity 4 begins to shrink so that the sealing baffle 9 is far away from the first drain hole 3, so that the first drain hole 3 is in a circulating state, and water can be drained.

The first piston cylinder 6 is provided with a second drain hole 10 and a third drain hole 11 in the vertical direction in the diameter direction, the length of the first piston body 7 is larger than the distance between the second drain hole 10 and the third drain hole 11, and when the sealing baffle 9 is in contact with the first drain hole 3, the second drain hole 10 and the third drain hole 11 are not communicated with the cavity 4.

When the first drain hole 3 is blocked or the flow rate of the drained water is larger, the first piston body 7 starts to move because the pressure of the water on the first piston body 7 is larger than the pressure of the air 5 in the cavity 4 on the first piston body 7, and the second drain hole 10 and the third drain hole 11 are opened during the movement, so that the water discharge capacity can be larger.

The central position of well lid body 2 still is provided with prevents stifled device, prevents stifled device and includes actuating mechanism and prevents stifled mechanism.

The driving mechanism comprises a driving column 12 arranged at the center of the well cover body 2, a spherical bulge 13 is arranged on the upper surface of the driving column 12, a second piston body 14 is connected to the lower end of the driving column 12, a second piston cylinder body 15 connected with the second piston body 14 in a sealing and sliding manner is arranged at the center of the well cover, a second clamping table 16 for preventing the second piston body 14 from sliding out is arranged on the second piston cylinder body 15, the second piston cylinder body 15 further comprises a cylinder bottom 17, a first compression spring 18 is arranged between the second piston body 14 and the cylinder bottom 17, when no automobile passes through, the upper surface of the driving column 12 is flush with the upper surface of the well cover body 2, an air inlet check valve 19 and an air outlet check valve 20 are connected to the cylinder bottom 17, the air inlet check valve 19 is connected with an air inlet channel 21, the air inlet channel 21 is communicated with the outside, the air outlet check valve 20 is connected with a connecting pipe 22, and the other end of the connecting pipe 22 is connected with an air storage tank 23, the air storage tank 23 is connected with an independent air outlet channel 24, the air outlet channel 24 is provided with a switch mechanism, and the other end of the air outlet channel 24 is connected with a blockage clearing mechanism.

When the vehicle passes by, the tire of the vehicle can generate pressure on the spherical bulge 13, so that the air 5 in the second piston cylinder 15 can be pressed into the air storage tank 23 through the air outlet one-way valve 20, and after the tire leaves, the air 5 is sucked into the second piston cylinder 15 through the air inlet one-way valve 19 under the action of the first spring, so that the reciprocating motion can collect energy, and high-pressure air is stored in the air storage tank 23.

The switch mechanism comprises a switch tube 25 which is arranged on the same plane with the second drain hole 10 and the third drain hole 11 and is arranged at the position, close to the center of the well cover, of the first piston cylinder body 6, a switch rod 26 is connected in the switch tube 25 in a sealing and sliding mode, a spherical lug 27 is connected to the top end of the switch rod 26, a second compression spring 28 is connected between the bottom of the switch rod 26 and the bottom of the switch tube 25, an air outlet channel 24 penetrates through the switch tube 25, a through hole 29 is formed in the switch tube 25, the lug 27 extends into the first piston cylinder body 6 when the second compression spring 28 is in a natural state, the air outlet channel 24 is staggered with the through hole 29, the air outlet channel 24 is closed, and when the first piston body 7 presses the lug 27 back into the switch tube 25, the through hole 29 is communicated with the air outlet channel 24; the length of the first piston body 7 is equal to the distance between the third drain hole 11 and the switching tube 25.

When the first drainage hole 3 is blocked, the second drainage hole 10 and the third drainage hole 11 cannot meet the requirement of drainage capacity, the anti-blocking device can clear up the impurities blocked in the first drainage hole 3, at the moment, the large first piston body 7 of the water pressure can move and enables the switching mechanism to be in a communicated state through the extrusion lug 27, at the moment, high-pressure air 5 in the air storage tank 23 flows into the blockage clearing mechanism through the air outlet channel 24, and the blockage clearing mechanism can clear up the impurities in the first drainage hole 3, so that the circulation of the first drainage hole 3 is guaranteed.

The blockage clearing mechanism comprises a blockage clearing pipe 31 sleeved in the first drainage pipe, a plurality of blockage clearing plates 32 are uniformly arranged on the blockage clearing pipe 31, the blockage clearing plates 32 are arranged in an arc shape, one side, facing the center, of each blockage clearing plate 32 is provided with a pitted surface 33, the blockage clearing pipe 31 is fixedly connected with a pushing mechanism, the pushing mechanism comprises a third piston cylinder 34 arranged in the well cover body 2 in the vertical direction, a third piston body 35 is connected in the third piston cylinder 34 in a sealing and sliding mode, the third piston cylinder 34 is provided with a third clamping table 36 for preventing the third piston body 35 from sliding out, a third compression spring 37 is arranged between the third piston body 35 and the third clamping table 36, the third piston body 35 is naturally contacted with the top end of the third piston cylinder 34, the top end of the third piston cylinder 34 is communicated with the air outlet channel 24, and the lower end of the third piston body 35 is connected with a fixing rod 38 for being fixedly connected with the blockage clearing pipe 31. The piston body is internally provided with an air passing hole 39 which has a diameter one tenth of the diameter of the piston body and is communicated up and down. Since the diameter of the air passing hole 39 is much smaller than that of the piston body, the piston body moves when the high pressure gas flows in, and does not flow out of the air passing hole 39.

The high pressure air 5 in the air storage tank 23 flows into the third piston cylinder 34 through the air outlet channel 24, drives the third piston body 35 to move downwards, and simultaneously drives the blockage removing pipe 31 and the blockage removing plate 32 to move downwards, and because the pitted surface 33 is arranged on one side of the blockage removing plate 32 close to the center, the pitted surface has larger friction force with the impurities, the impurities can be driven to move downwards and be discharged in the downward moving process, so that the circulation of the first drainage pipe is ensured, after the impurities are discharged, the air pressure in the piston body can be gradually balanced through the air holes 39, and therefore the original position can be recovered under the action of the spring.

The working state of the well cover is described in detail as follows: 1. while the first drain hole 3 remains in circulation: the first piston body 7 can make the sealing separation blade 9 contact with the first drainage hole 3 to make the first drainage hole 3 in a blocking state due to the expansion of the air 5 in the cavity 4 when the temperature is high through the change of the external temperature, so that the aim of deodorization is fulfilled; 2. the gas storage process of the gas storage tank 23: when a vehicle passes by, the tire of the vehicle generates pressure on the spherical bulge 13, so that the air 5 in the second piston cylinder 15 is pressed into the air storage tank 23 through the air outlet one-way valve 20, and after the tire leaves, the air 5 is sucked into the second piston cylinder 15 through the air inlet one-way valve 19 under the action of the first compression spring 18, so that energy can be collected in a reciprocating mode, and high-pressure air is stored in the air storage tank 23; 3. when drainage is required; because the temperature of water can reduce the temperature of the air 5 in the cavity 4, therefore the air 5 in the cavity 4 contracts, then the first drain hole 3 is opened, when the first drain hole 3 is blocked or the flow of the drained water is larger, at this time, because the pressure of the water to the first piston body 7 is greater than the pressure of the air 5 in the cavity 4 to the first piston body 7, the first piston body 7 starts to move, the second drain hole 10 and the third drain hole 11 are opened in the moving process, thereby the water drainage quantity can be larger, meanwhile, because if the first drain hole 3 is blocked, the pressure of the water to the first piston body 7 is overlarge, until the triggering switch mechanism is blocked, the gas in the gas storage tank 23 is released to the blockage clearing mechanism, so that the first drain pipe is in a circulation state, and further the first drain pipe is prevented from being blocked.

In conclusion, the invention has the following beneficial effects: the invention has good deodorization effect, can meet the requirement of large-water-volume drainage, can automatically clear blockage when the first drainage hole 3 is blocked, is efficient and quick, and has good social significance.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a well lid, installs on well lid mount pad (1), including circular shape well lid body (2), the position that is close to the edge of well lid body (2) evenly is provided with first drainage hole (3) of a plurality of vertical directions, its characterized in that: the manhole cover comprises a manhole cover body (2), wherein a cavity (4) is arranged in the manhole cover body (2), the cavity (4) is filled with air (5), the air (5) in the cavity (4) is at atmospheric pressure at normal temperature, the cavity (4) is uniformly communicated with a plurality of first piston cylinder bodies (6), the piston cylinder bodies are arranged in the diameter direction of the manhole cover body (2), the number of the first piston cylinder bodies (6) is equal to that of the first drainage holes (3), meanwhile, the first piston cylinder bodies (6) are communicated with the first drainage holes (3), the first piston cylinder bodies (6) are connected with first piston bodies (7) in a sliding and sealing mode, one side, close to the cavity (4), of each first piston cylinder body (6) is provided with a first clamping table (8) for preventing the piston bodies from sliding in, one side, close to the first drainage holes (3), of each first piston cylinder body (6) is provided with a sealing blocking piece (9) for deodorization, under the normal temperature state, the sealing baffle (9) is not contacted with the first drainage hole (3), and when the temperature is higher than the normal temperature, the sealing baffle (9) gradually begins to be contacted with the first drainage hole (3) due to the expansion of air (5); the first piston cylinder body (6) is provided with a second drain hole (10) and a third drain hole (11) which are arranged in the vertical direction in the diameter direction, the length of the first piston body (7) is larger than the distance between the second drain hole (10) and the third drain hole (11), and when the sealing baffle piece (9) is in contact with the first drain hole (3), the second drain hole (10) and the third drain hole (11) are not communicated with the cavity (4); an anti-blocking device is further arranged at the center of the well lid body (2), and comprises a driving mechanism and an anti-blocking mechanism; the driving mechanism comprises a driving column (12) arranged at the center of the well lid body (2), a spherical protrusion (13) is arranged on the upper surface of the driving column (12), a second piston body (14) is connected to the lower end of the driving column (12), a second piston cylinder body (15) connected with the second piston body (14) in a sealing and sliding mode is arranged at the center of the well lid, a second clamping table (16) for preventing the second piston body (14) from sliding out is arranged on the second piston cylinder body (15), the second piston cylinder body (15) further comprises a cylinder bottom (17), a first compression spring (18) is arranged between the second piston body (14) and the cylinder bottom (17), when no automobile passes through, the upper surface of the driving column (12) is flush with the upper surface of the well lid body (2), and the cylinder bottom (17) is connected with an air inlet check valve (19) and an air outlet check valve (20), the air inlet one-way valve (19) is connected with an air inlet channel (21), the air inlet channel (21) is communicated with the outside, the air outlet one-way valve (20) is connected with a connecting pipe (22), the other end of the connecting pipe (22) is connected with an air storage tank (23), the air storage tank (23) is connected with an independent air outlet channel (24), a switch mechanism is arranged on the air outlet channel (24), and the other end of the air outlet channel (24) is connected with a blockage clearing mechanism; the switch mechanism comprises a switch tube (25) which is arranged on the same plane of the second drain hole (10) and the third drain hole (11) and is arranged at the position, close to the center of the well cover, of the first piston cylinder body (6), a switch rod (26) is connected in the switch tube (25) in a sealing and sliding mode, the top end of the switch rod (26) is connected with a spherical lug (27), a second compression spring (28) is connected between the bottom of the switch rod (26) and the bottom of the switch tube (25), the air outlet channel (24) penetrates through the switch tube (25), a through hole (29) is formed in the switch tube (25), the lug (27) extends into the first piston cylinder body (6) when the second compression spring (28) is in a natural state, the air outlet channel (24) is staggered with the through hole (29), and the air outlet channel (24) is closed, when the first piston body (7) presses the lug (27) back into the switch tube (25), the through hole (29) is communicated with the air outlet channel (24); the length of the first piston body (7) is equal to the distance between the third drain hole (11) and the switch tube (25); the blockage clearing mechanism comprises a blockage clearing pipe (31) sleeved in a first drainage pipe, a plurality of blockage clearing plates (32) are uniformly arranged on the blockage clearing pipe (31), the blockage clearing plates (32) are arranged in an arc shape, a pitted surface (33) is arranged on one side, facing the center, of each blockage clearing plate (32), a pushing mechanism is fixedly connected to each blockage clearing pipe (31), each pushing mechanism comprises a third piston cylinder body (34) arranged in the well cover body (2) in the vertical direction, a third piston body (35) is connected to each third piston cylinder body (34) in a sealing sliding mode, each third piston cylinder body (34) is provided with a third clamping table (36) for preventing each third piston body (35) from sliding out, a third compression spring (37) is arranged between each third piston body (35) and the corresponding third clamping table (36), and the third piston bodies (35) are naturally contacted with the top ends of the third piston cylinders (34), the top end of the third piston cylinder body (34) is communicated with the air outlet channel (24), the lower end of the third piston body (35) is connected with a fixing rod (38) which is used for being fixedly connected with the blockage removing pipe (31), and an air passing hole (39) which is communicated up and down and has the diameter of one tenth of the diameter of the piston body is arranged in the piston body; fins (30) used for increasing the heat exchange area are uniformly arranged in the cavity (4); the surface area of the fin is 3-50 square centimeters; the thickness of the fin is 1 mm.