CN209897870U

CN209897870U - Sprinkling irrigation equipment is used in gardens

Info

Publication number: CN209897870U
Application number: CN201821663402.XU
Authority: CN
Inventors: 丁汉杰; 朱梦婷; 陆嘉诚; 周婷
Original assignee: Zhejiang Carson Construction Co Ltd
Current assignee: Zhejiang Carson Construction Co Ltd
Priority date: 2018-10-13
Filing date: 2018-10-13
Publication date: 2020-01-07
Anticipated expiration: 2028-10-13

Abstract

The utility model discloses a sprinkling irrigation equipment is used in gardens relates to gardens technical field, aims at solving the nonadjustable problem of traditional sprinkling irrigation scope, and its technical scheme main points are: the sprinkling irrigation device for the gardens comprises a cylindrical barrel body fixedly arranged on the ground, a water spraying mechanism arranged in the barrel body, and a flow guide mechanism arranged above the water outlet end of the water spraying mechanism and connected to the barrel body, wherein the bottom end of the water spraying mechanism is connected with a water pipe, the upper end of the water spraying mechanism is in a divergent shape and sprays water outwards, and the height of the flow guide mechanism can be adjusted. The utility model discloses a sprinkling irrigation equipment is used in gardens has the advantage that the sprinkling irrigation scope is adjustable, the water economy resource.

Description

Sprinkling irrigation equipment is used in gardens

Technical Field

The utility model belongs to the technical field of the gardens technique and specifically relates to a sprinkling irrigation equipment is used in gardens.

Background

The garden irrigation is to supplement soil moisture of garden greenbelts in different irrigation forms by using an artificial method or a mechanical method to meet the moisture requirement of plants, a garden irrigation system needs to be matched with the water requirement of the plants, the water and energy conservation, the convenience, the practicability and other factors are considered, and meanwhile, the garden landscape is brightened and added with color.

The existing sprinkling irrigation device usually comprises a sprinkling irrigation body, wherein a nozzle is arranged on the sprinkling irrigation body, and the nozzle can spray water in a divergent manner to the periphery, so that the plants within a specific radius range can be irrigated.

The above prior art solutions have the following drawbacks: because the sprinkling radius is fixed, the sprinkling range can not be adjusted.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a sprinkling irrigation equipment is used in gardens has sprinkling irrigation scope adjustable advantage.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the sprinkling irrigation device for the gardens comprises a cylindrical barrel body fixedly arranged on the ground, a water spraying mechanism arranged in the barrel body, and a flow guide mechanism arranged above the water outlet end of the water spraying mechanism and connected to the barrel body, wherein the bottom end of the water spraying mechanism is connected with a water pipe, the upper end of the water spraying mechanism is in a divergent shape and sprays water outwards, and the height of the flow guide mechanism can be adjusted.

By adopting the technical scheme, the height of the flow guide mechanism can be adjusted; the water spraying mechanism is connected to the reservoir through a water pipe, water is sprayed outwards through the water spraying mechanism, the water sprayed out of the water spraying mechanism is in a fan-shaped emission shape and is large in range, the water mist above the water spraying mechanism is blocked through the diversion mechanism, when the water mist touches the diversion mechanism, the water mist can flow along the diversion mechanism and can be recycled, the blocking range of the water mist can be adjusted by adjusting the height of the diversion mechanism, namely when the diversion mechanism is adjusted upwards, the blocking area of the water mist is small, the water sprayed out of the water spraying mechanism is large, when the diversion mechanism is adjusted downwards, the blocking area of the water mist is large, the water sprayed out of the water spraying mechanism is reduced, and therefore the water spraying range is adjusted.

The utility model discloses further set up to: the water spraying mechanism comprises a sealed barrel fixedly arranged in the barrel body, the bottom of the sealed barrel is connected to a water pipe, a plurality of spray heads are arranged at the top of the sealed barrel and distributed annularly along the top of the sealed barrel, and the spray heads are arranged towards the outer side.

Through adopting above-mentioned technical scheme, the rainwater in the water pump will the cistern leads to the water pipe pump to sealed bucket in to when the water accumulation in the sealed bucket reaches sufficient volume, the water pressure in the sealed bucket reaches a definite value, can outwards spray the rainwater from a plurality of shower nozzle, realize the sprinkling irrigation.

The utility model discloses further set up to: the sealing barrel is annularly arranged in the cross section, the flow guide mechanism comprises a backflow groove formed in the middle of the sealing barrel, a supporting rod fixedly arranged at the bottom of the backflow groove, and a water guide plate connected to the top end of the supporting rod, and the water guide plate is arranged in a downward convex hemispherical surface mode.

Through adopting above-mentioned technical scheme, shower nozzle spun partly water smoke upwards sprays the lower surface of water deflector, and rivers converge and realize the backward flow along the bracing piece downwards to the minimum at water deflector lower surface water deflector center and collect in flowing into the backward flow groove, through the water deflector, can adjust the scope of shower nozzle spun water smoke on the one hand, and on the other hand can make the water smoke backward flow that blocks retrieve, has not only practiced thrift the water resource, can avoid the peripheral ground of staving to spill too much moreover.

The utility model discloses further set up to: the bracing piece is including fixed the mount pad that sets up in the return chute bottom surface, set up screw hole, threaded connection in the downthehole lifter of screw thread of mount pad, water guide plate bottom is connected in the lifter top.

Through adopting above-mentioned technical scheme, because screw-thread fit between lifter and the mount pad, rotate the height that the lifter can adjust the lifter to adjust the height of water guide plate.

The utility model discloses further set up to: the lower surface of the water guide plate is equally provided with a plurality of diversion trenches.

Through adopting above-mentioned technical scheme, through setting up the guiding gutter, can play the effect of further water conservancy diversion to the rivers that spray the water deflector lower surface.

The utility model discloses further set up to: and the bottom of the return tank is connected with a return pipe used for returning return water to the water tank.

Through adopting above-mentioned technical scheme, because the backwash tank sets up in the middle part of sealed bucket, its storage capacity is certain, when the water in the backwash tank was filled with, sends water back to the cistern through the back flow, realizes reuse, has improved resource utilization.

The utility model discloses further set up to: the upper edge of the reflux groove is provided with a flow guide cover, and the flow guide cover is arranged in a conical surface with a large upper part and a small lower part.

Through adopting above-mentioned technical scheme, rivers assemble towards the centre along the water deflector lower surface like this, and it is great when the backward flow water yield, the rivers of water deflector lower surface are probably fallen down when not flowing to the bottommost, can play certain guide effect to rivers through the kuppe, avoid rivers to fall outside the backward flow groove.

To sum up, the utility model discloses a beneficial technological effect does:

1. the height of the flow guide mechanism is adjustable; the water spraying mechanism is connected to the reservoir through a water pipe, water is sprayed outwards through the water spraying mechanism, water sprayed out of the water spraying mechanism is in a fan-shaped emission shape and is large in range, water mist above the water spraying mechanism is blocked through the diversion mechanism, the water mist can flow along the diversion mechanism and can be recycled when the water mist meets the diversion mechanism, the blocking range of the water mist can be adjusted by adjusting the height of the diversion mechanism, namely when the diversion mechanism is adjusted upwards, the blocking area of the water mist is small, the water sprayed out of the water spraying mechanism is large, when the diversion mechanism is adjusted downwards, the blocking area of the water mist is large, the water sprayed out of the water spraying mechanism is reduced, and therefore the water spraying range is adjusted;

2. the lower surface of water deflector is upwards sprayed to shower nozzle spun partly water smoke, and rivers converge and realize the backward flow along the bracing piece downwards to the minimum at water deflector lower surface water deflector center and collect to flow into the backward flow inslot along the bracing piece, through the water deflector, can adjust the scope of shower nozzle spun water smoke on the one hand, and on the other hand can make the water smoke backward flow that blocks retrieve, has not only practiced thrift the water resource, can avoid the peripheral ground of staving to spill too much moreover.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an external structural schematic view of a water storage device.

FIG. 3 is a cross-sectional view of the water storage device, primarily to show the internal structure of the water storage device.

Fig. 4 is an enlarged schematic view of section a of fig. 3, primarily to show the water assembly.

Fig. 5 is an external structural view of the spraying device.

Fig. 6 is a cross-sectional view of the sprinkler, primarily to show the internal structure of the sprinkler.

Fig. 7 is a schematic structural view of the conveying assembly.

In the figure, 1, a water storage device; 2. a delivery assembly; 3. a spraying device; 4. a reservoir; 5. a pre-water storage mechanism; 6. a water outlet assembly; 7. a drive assembly; 8. a telescopic column; 9. temporarily storing a water tank; 10. a lift spring; 11. a water outlet; 12. a control gate; 13. mounting grooves; 14. a fixed block; 15. a transverse groove; 16. a push rod; 17. a drive spring; 18. a first column; 19. a second cylinder; 20. a rubber sheet; 21. a guide strip; 22. a guide groove; 23. a first filter screen; 24. a second filter screen; 25. a barrel body; 26. a water spraying mechanism; 27. a flow guide mechanism; 28. a water pipe; 29. sealing the barrel; 30. a spray head; 31. a reflux tank; 32. a support bar; 33. a water guide plate; 34. a mounting seat; 35. a threaded hole; 36. a lifting rod; 37. a diversion trench; 38. a return pipe; 39. a pod; 40. a cement tank.

Detailed Description

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

Referring to fig. 1, for the utility model discloses a sprinkling irrigation equipment is used in gardens, including setting up at the water storage device 1 in gardens ponding district, water storage device 1 is used for collecting and stores unnecessary rainwater, still including connecting in water storage device 1's transport module 2, connecting in the sprinkler 3 that transport module 2 goes out the water end, water storage device 1 is the upper end opening setting and a plurality of sprinkler 3 equidistant settings are subaerial on lawn. When the rainfall is great, unnecessary rainwater enters into water storage device 1 and stores, when not raining for a long time and need water to the plant, conveying assembly 2 carries the rainwater in water storage device 1 to sprinkler 3, realizes the sprinkling irrigation to the plant through sprinkler 3 to reach the purpose of effectively utilizing the water resource, can get up unnecessary rainwater make full use of, practiced thrift the water resource, accord with environmental protection and energy saving's theory.

As shown in fig. 2 and 3, the water storage device 1 comprises a water storage tank 4 arranged in a garden water accumulation area, the water storage tank 4 is buried underground, and the upper end of the water storage tank 4 is flush with the ground, and further comprises a pre-water storage mechanism 5 arranged in the water storage tank 4, the pre-water storage mechanism 5 is arranged in the water storage tank 4 in a vertically sliding manner, a water outlet assembly 6 is arranged on the side wall of the pre-water storage mechanism 5, and a driving assembly 7 for controlling the water outlet assembly 6 to be opened or closed is arranged on the side wall; when raining, the rainwater firstly enters the pre-water storage mechanism 5, along with the increase of the water amount in the pre-water storage mechanism 5, the pre-water storage mechanism 5 is subjected to the gravity of water, the water is increasingly larger and moves downwards, when the pre-water storage mechanism 5 moves downwards to the height of the water outlet assembly 6 and the driving assembly 7, the driving assembly 7 opens the water outlet assembly 6, so that the rainwater in the pre-water storage mechanism 5 is released and enters the water storage tank 4, the rainwater can be precipitated to a certain degree after being temporarily stored by the pre-water storage mechanism 5, the rainwater is filtered once, and on the other hand, sundries such as gravel mixed in the rainwater can be prevented from being piled at the bottom of the water storage tank 4, and the volume of the water storage tank 4.

As shown in fig. 3, the pre-storage mechanism 5 comprises a telescopic column 8 vertically arranged in the middle of the reservoir 4, the upper end of the telescopic column 8 is connected with a temporary storage water tank 9, the telescopic column 8 is sleeved with a lifting spring 10, the upper end of the lifting spring 10 is connected to the lower surface of the temporary storage water tank 9, and the lower end of the lifting spring is connected to the bottom surface of the reservoir 4; after sufficient amount of rainwater is gone into in the water tank 9 of keeping in, can the downstream under rainwater action of gravity, simultaneously downward compression spring, when the water tank 9 of keeping in moves down to go out water subassembly 6 and drive assembly 7 when high, drive assembly 7 opens out water subassembly 6, thereby make the rainwater in the water tank 9 of keeping in outwards flow into the cistern 4, when the rainwater in the water tank 9 of keeping in unloads out, the pressure that the water tank 9 of keeping in received reduces, the automatic re-setting effect through compression spring will be kept in water tank 9 jack-up once more this moment, carry out next circulation.

As shown in fig. 3, the telescopic column 8 includes a first column 18 fixedly disposed on the bottom surface of the water reservoir 4, and a second column 19 slidably sleeved in the first column 18, and the first column 18 and the second column 19 are tightly fitted; when temporary storage water tank 9 goes up and down along cistern 4, first cylinder 18 slides from top to bottom along second cylinder 19 to play the effect of direction to temporary storage water tank 9, can prevent that temporary storage water tank 9 from taking place to warp.

As shown in fig. 2, a guide strip 21 is longitudinally arranged on the inner wall of the water reservoir 4, and a guide groove 22 for longitudinally sliding and embedding the guide strip 21 is formed on the outer wall of the temporary storage water tank 9; when water tank 9 slides up and down in cistern 4, through the slip of gib block 21 along guide way 22 to play certain guide effect to water tank 9, prevent that water tank 9 from taking place to rotate.

As shown in fig. 3 and 4, the water outlet assembly 6 includes a water outlet 11 opened on the side wall of the temporary water storage tank 9, the upper edge of the water outlet 11 is rotatably connected with a control door 12 for opening and closing the water outlet 11 through a torsion spring, the edge of the water outlet 11 is trapezoidal, and the edge of the control door 12 is trapezoidal and is in sealing fit with the edge of the water outlet 11; the control door 12 always has the trend of rotating towards the side wall of the temporary storage water tank 9 under the action of the torsion spring, and through the trapezoid structures at the edges of the water outlet 11 and the control door 12, the control door 12 can be prevented from rotating outwards excessively, a certain sealing effect can be achieved, and accordingly excessive rainwater in the temporary storage tank can be prevented from leaking outwards.

As shown in fig. 4, in order to improve the sealing performance at the water outlet 11, the edge of the water outlet 11 is covered with a rubber sheet 20, the edge of the control door 12 is also covered with the rubber sheet 20, and the sealing performance can be improved by the rubber sheet 20, so that excessive rainwater in the temporary storage tank is prevented from flowing out from the gap.

As shown in fig. 3, the driving assembly 7 includes an installation groove 13 opened on the side wall of the reservoir 4, a fixed block 14 fixedly disposed in the installation groove 13, a transverse groove 15 transversely opened in the fixed block 14, and a push rod 16 slidably disposed in the transverse groove 15, a driving spring 17 is disposed in the transverse groove 15, one end of the driving spring 17 is connected to the inner wall of the transverse groove 15, the other end is connected to the end of the push rod 16, and the upper surface and the lower surface of one end of the push rod 16 extending out of the transverse groove 15 are both inclined; the push rod 16 can slide along the transverse groove 15, when the push rod 16 retracts into the transverse groove 15, the driving spring 17 is in a compression state, when the push rod 16 is not stressed, the driving spring 17 ejects the push rod 16, when the water amount in the temporary storage water tank 9 gradually increases, the temporary storage water tank 9 gradually moves downwards, the lower edge of the temporary storage water tank 9 firstly collides with the upper surface of the push rod 16, because the upper surface of the push rod 16 is arranged in a downward inclination mode, the push rod 16 can be pushed towards the transverse groove 15, at the moment, the driving spring 17 is in a compression state, when the temporary storage water tank 9 continuously moves downwards to the position where the control door 12 is equal to the push rod 16 in height, under the reset action of the driving spring 17, the push rod 16 is pushed to slide towards the control door 12, the control door 12 is opened, water in the temporary storage water tank 9 flows into the water storage tank 4, and the technical effect. And the delivery port 11 sets up the intermediate position of temporary storage water tank 9 lateral wall to make the rainwater that gets into in the temporary storage water tank 9 can deposit, impurity deposits in the bottom of temporary storage water tank 9, and when control door 12 was opened, the clear rainwater in upper strata flowed out, played certain filtering action.

As shown in fig. 3, a first filter screen 23 is disposed in the temporary storage water tank 9, and when rainwater enters the temporary storage water tank 9, impurities in a part of rainwater can be filtered through the filtering effect of the first filter screen 23. Be provided with second filter screen 24 in cistern 4 to second filter screen 24 position is less than the position of keeping in water tank 9 when opening of water outlet assembly 6, and second filter screen 24's mesh is less than first filter screen 23's mesh, and the rainwater can filter great stone impurity in the rainwater when first filter screen 23 like this, when the rainwater passes through second filter screen 24, can filter less impurity in the rainwater, realizes twice filtration.

As shown in fig. 3 and 7, the conveying assembly 2 comprises a water pump arranged in the water reservoir 4, the water pump is connected with a water pipe 28, one end of the water pipe 28 is connected with the water storage device 1, the other end of the water pipe is connected with the spraying device 3, the conveying assembly also comprises a cement groove 40 which is laid along the direction of the water pipe 28 and has a U-shaped longitudinal section, and the water pipe 28 is embedded in the cement groove 40; by laying the cement tank 40 and embedding the water pipe 28 in the cement tank 40, the damage of the surrounding soil to the water pipe 28 can be reduced, and the effect of protecting the water pipe 28 is achieved.

As shown in fig. 5 and 6, the spraying device 3 includes a cylindrical barrel 25 fixedly disposed on the ground, a water spraying mechanism 26 disposed in the barrel 25, and a guiding mechanism 27 disposed above the water outlet end of the water spraying mechanism 26 and connected to the barrel 25, wherein the bottom end of the water spraying mechanism 26 is connected to a water pipe 28, the upper end of the water spraying mechanism sprays water outwards in a divergent manner, and the height of the guiding mechanism 27 is adjustable; the water spraying mechanism 26 is connected to the water storage tank 4 through a water pipe 28, water is sprayed outwards through the water spraying mechanism 26, water sprayed out of the water spraying mechanism 26 is in a fan-shaped emission shape and is large in range, water mist above the water spraying mechanism is blocked through the diversion mechanism 27, when the water mist touches the diversion mechanism 27, the water mist can flow along the diversion mechanism 27 and can be recycled, the blocking range of the water mist can be adjusted by adjusting the height of the diversion mechanism 27, namely when the diversion mechanism 27 is adjusted upwards, the blocking area of the water mist is small, the water sprayed out of the water spraying mechanism 26 is large, when the diversion mechanism 27 is adjusted downwards, the blocking area of the water mist is large, the water sprayed out of the water spraying mechanism 26 is small, and therefore the water spraying range is adjusted.

As shown in fig. 6, the water spraying mechanism 26 includes a sealing barrel 29 fixedly disposed in the barrel 25, the bottom of the sealing barrel 29 is connected to the water pipe 28, a plurality of nozzles 30 are disposed on the top of the sealing barrel 29, the plurality of nozzles 30 are distributed annularly and equally along the top of the sealing barrel 29, and the nozzles 30 are disposed facing outward; the water pump pumps the rainwater in the reservoir 4 into the sealed barrel 29 through the water pipe 28, and when the water in the sealed barrel 29 is accumulated to a sufficient amount, the water pressure in the sealed barrel 29 reaches a certain value, and the rainwater can be sprayed outwards from the plurality of spray heads 30, so that the sprinkling irrigation is realized.

As shown in fig. 6, the cross section of the sealed barrel 29 is annularly arranged, the guide mechanism 27 comprises a return groove 31 arranged in the middle of the sealed barrel 29, the return groove 31 is formed by the inner wall of the sealed barrel 29, the guide mechanism further comprises a support rod 32 fixedly arranged at the bottom of the return groove 31 and a water guide plate 33 connected to the top end of the support rod 32, the water guide plate 33 is arranged in a downward convex hemispherical surface, and the lowest point of the water guide plate 33 is connected to the upper end of the support rod 32; some water smoke that shower nozzle 30 spun upwards sprays the lower surface of water deflector 33, and rivers converge towards the minimum point at water deflector 33 center and realize the backward flow along bracing piece 32 downwards inflow in backflow groove 31 along water deflector 33 lower surface convergence, through water deflector 33, can adjust the scope of shower nozzle 30 spun water smoke on the one hand, and on the other hand can make the water smoke backward flow of blockking retrieve, has not only practiced thrift the water resource, can avoid the peripheral ground of staving 25 to spill too much moreover.

As shown in fig. 6, a guide cover 39 is arranged on the upper edge of the return groove 31, the guide cover 39 is arranged in a conical surface with a large upper part and a small lower part, and the upper end and the lower end of the guide cover 39 are opened; therefore, when the water flow converges towards the middle along the lower surface of the water guide plate 33, when the amount of the backflow water is large, the water flow on the lower surface of the water guide plate 33 may fall down when not flowing to the bottom end, and a certain guiding effect can be achieved on the water flow through the guide cover 39, so that the water flow is prevented from falling to the outside of the backflow groove 31.

As shown in fig. 6, the support rod 32 includes an installation seat 34 fixedly disposed on the bottom surface of the reflow tank 31, a threaded hole 35 opened in the installation seat 34, and a lifting rod 36 threadedly connected in the threaded hole 35, and the bottom of the water guide plate 33 is connected to the top end of the lifting rod 36; due to the threaded fit between the lifting rod 36 and the mounting seat 34, the height of the lifting rod 36 can be adjusted by rotating the lifting rod 36, and therefore the height of the water guide plate 33 can be adjusted.

As shown in fig. 5, a plurality of diversion trenches 37 are equally formed in the lower surface of the water deflector 33, and the diversion trenches 37 are longitudinally arranged; by providing the diversion trench 37, the water flow sprayed on the lower surface of the water deflector 33 can be further guided.

As shown in fig. 1 and 6, in order to improve the resource utilization rate, a return pipe 38 for returning return water to the reservoir 4 is connected to the bottom of the return tank 31; because the return tank 31 is arranged in the middle of the sealed barrel 29, the storage capacity is constant, when the return tank 31 is filled with water, the water is sent back to the reservoir 4 through the return pipe 38, the reuse is realized, and the resource utilization rate is improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a sprinkling irrigation equipment is used in gardens which characterized in that: the water spraying device comprises a cylindrical barrel body (25) fixedly arranged on the ground, a water spraying mechanism (26) arranged in the barrel body (25), and a flow guide mechanism (27) arranged above the water outlet end of the water spraying mechanism (26) and connected to the barrel body (25), wherein the bottom end of the water spraying mechanism (26) is connected with a water pipe (28), the upper end of the water spraying mechanism is in a divergent shape to spray water outwards, and the height of the flow guide mechanism (27) is adjustable.

2. A sprinkling irrigation apparatus for gardens as claimed in claim 1, wherein: water spray mechanism (26) is including fixed sealed bucket (29) that set up in staving (25), sealed bucket (29) bottom is connected in water pipe (28), sealed bucket (29) top is provided with a plurality of shower nozzles (30), and is a plurality of shower nozzle (30) are the annular along sealed bucket (29) top surface and distribute, just shower nozzle (30) set up towards the outside.

3. A sprinkling irrigation apparatus for gardens as claimed in claim 2, wherein: the transversal annular setting of personally submitting of sealed bucket (29), water conservancy diversion mechanism (27) are including seting up in return chute (31) at sealed bucket (29) middle part, fixed setting in bracing piece (32) of return chute (31) bottom, connect in water deflector (33) on bracing piece (32) top, water deflector (33) are the setting of downward convex hemisphere face.

4. A sprinkling irrigation apparatus for gardens as claimed in claim 3, wherein: the supporting rod (32) comprises a mounting seat (34) fixedly arranged on the bottom surface of the backflow groove (31), a threaded hole (35) formed in the mounting seat (34), and a lifting rod (36) in threaded connection with the threaded hole (35), and the bottom of the water guide plate (33) is connected to the top end of the lifting rod (36).

5. A sprinkling irrigation apparatus for gardens as claimed in claim 3, wherein: the lower surface of the water guide plate (33) is equally provided with a plurality of flow guide grooves (37).

6. A sprinkling irrigation apparatus for gardens as claimed in claim 3, wherein: and a return pipe (38) for returning return water to the water tank is connected to the bottom of the return tank (31).

7. A sprinkling irrigation apparatus for gardens as claimed in claim 3, wherein: the upper edge of the reflux groove (31) is provided with a flow guide cover (39), and the flow guide cover (39) is arranged in a conical surface with a large upper part and a small lower part.