Detachable spraying device of finned heat exchanger

Abstract

The utility model discloses a detachable spraying device of a fin type heat exchanger, which belongs to the technical field of spraying equipment of heat exchangers and is characterized in that the spraying device is arranged on one side of each fin core body, the side wall of a casing is provided with corresponding mounting ports at the positions of the spraying devices, the spraying devices are provided with mounting end plates, and the mounting end plates are provided with mounting holes. The mounting end plate is detachably connected with the mounting through hole; a water receiving pipe is fixedly connected to the mounting end plate, one end of the water receiving pipe is exposed out of the outer side of the mounting end plate, and the water receiving pipe is communicated with an external water source through a pipeline; the other end of the water receiving pipe extends along the inner side of the mounting end plate and is connected with a plurality of branch pipes; each branch pipe is provided with a plurality of water outlets, and the water outlet of each branch pipe is provided with a nozzle. The spraying device is detachably connected with the machine shell, maintenance and cleaning of the spraying head are facilitated, and the workload and the safety risk of maintenance personnel are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger spray equipment technical field, concretely relates to detachable spray device of finned heat exchanger. BACKGROUND

[0002] In the production process of washing powder, finned heat exchanger as a kind of key energy-saving equipment is widely used in the treatment and waste heat recovery of exhaust emission. The high-temperature exhaust gas discharged in the production of washing powder is cooled by heat exchange through finned heat exchanger, which not only can effectively reduce the temperature of exhaust gas and reduce energy waste, but also can improve the energy efficiency ratio of the system through the recovered heat. In order to further improve the heat exchange efficiency, usually set up spray device to clean the finned heat exchanger to remove dust and washing powder particles attached to the surface of the finned heat exchanger, and maintain the efficient operation of the finned heat exchanger. Spray device can clean the surface of finned heat exchanger by spraying water, which helps to maintain the best working condition of finned heat exchanger and is of great significance to energy saving and emission reduction.

[0003] The Chinese patent document with publication number CN211925931U relates to a heat exchanger structure and an air conditioner, which includes a spray pipe and a fin group. The side wall of the spray pipe is provided with spray holes, so that water flows from the spray holes to the gap between adjacent fins. This not only cleans the dust on the surface of the heat exchanger, but also cleans the dust accumulated between different fins, thereby improving the heat exchange effect of the heat exchanger and ensuring the performance of the air conditioner. However, in the production process of washing powder, the spray head of the spray device also faces the problem of washing powder residue, which affects the spraying effect and reduces the cleaning efficiency. In addition, when the spray head needs to be replaced, maintenance personnel must drill into the narrow space for repair and replacement, which not only consumes time and effort, but also has safety risks.

[0004] Therefore, in view of the cleaning and spray head replacement problems of finned heat exchanger in the production process of washing powder, an improved detachable spray device for finned heat exchanger is urgently needed. SUMMARY

[0005] In view of the problems in the related art, the utility model provides a detachable spray device for finned heat exchanger to solve the technical problems that the existing finned heat exchanger is difficult to clean the spray head and the spray head is difficult to repair and replace.

[0006] The technical scheme of the utility model is achieved as follows: a detachable spraying device of a finned heat exchanger is arranged on the finned heat exchanger, the finned heat exchanger comprises a casing with a hollow inner cavity, and an input port and an output port which are in communication with the inner cavity are arranged on the casing; a plurality of fin cores are arranged in parallel in the inner cavity, fluid enters the inner cavity from the input port, exchanges heat with the fin cores and is sent out from the output port; a corresponding spraying device is arranged on one side of each fin core;

[0007] Along the extension direction of the inner cavity of the casing, the fin cores and the spraying devices are staggered with each other; a corresponding mounting port is arranged on the side wall of the casing at each spraying device, the spraying device enters and exits the inner cavity through the mounting port; the spraying device is provided with a mounting end plate which is matched with the mounting port, and the mounting end plate is detachably connected with the mounting port;

[0008] A water collecting pipe is fixed to the mounting end plate, one end of the water collecting pipe is exposed to the outside of the mounting end plate and is in communication with an external water source through a pipeline, and the other end of the water collecting pipe extends along the inner side of the mounting end plate and is connected with a plurality of branch pipes; a plurality of water outlets are arranged on each branch pipe, and each water outlet of each branch pipe is provided with a spray head; the water collecting pipe introduces the water source into the water outlets of the branch pipes, and water is sprayed out from the spray heads.

[0009] The mounting end plate of the spraying device is detachably connected with the mounting port of the casing, the spraying device can be separated from the casing, the spray heads can be maintained and cleaned, the workload and safety risk of maintenance personnel are reduced, the effect of spraying and cleaning is improved, the efficient operation of the finned heat exchanger is ensured, the defects in the prior art are effectively solved, and technical support is provided for the environmental protection and energy efficiency improvement of washing powder production.

[0010] As a further improvement of the above scheme, a flange plate is arranged on the mounting end plate, a plurality of through holes are arranged along the circumferential edge of the flange plate, and a fastener passes through the through holes to detachably connect the mounting end plate with the mounting port. The plurality of through holes on the flange plate are detachably connected with the mounting port, which enhances the flexibility and efficiency of disassembly. When the spraying device behind the mounting end plate needs to be overhauled or the spray head needs to be replaced, the maintenance personnel can quickly pull out the spraying device for maintenance through the disassembly connection point without manually drilling into the narrow inner cavity of the casing, so that the operation safety is ensured and the work efficiency is improved.

[0011] As a further improvement of the above scheme, the outer side of the mounting end plate is spaced and fixed from top to bottom with a plurality of pressing plates, the two ends of the pressing plate extend out of the mounting end plate respectively, and the end of the pressing plate extension is provided with a notch; the fastener passes through the notch to detachably connect the mounting end plate on the mounting opening. Through the notch on the pressing plate, the detachable connection with the mounting opening further enhances the flexibility of disassembly. Maintenance personnel can disassemble the pressing plate step by step to reduce the difficulty of disassembly, and the notch design at the end of the pressing plate also facilitates the operation of the fastener, making the disassembly process more smooth.

[0012] As a further improvement of the above scheme, the branch pipes are parallel to each other, and the water receiving pipe and each branch pipe are in the same common plane; the normal direction of the common plane is perpendicular to the direction of the spray device entering and exiting the inner cavity. The layout of the normal direction of the common plane perpendicular to the direction of the spray device entering and exiting the inner cavity makes the disassembly and maintenance work more convenient. Maintenance personnel can easily disassemble and install the spray device along the vertical direction without complex rotation or adjustment, not only saving space but also improving the stability and safety of operation.

[0013] As a further improvement of the above scheme, the top of the water receiving pipe is further fixed with a guide rod, the guide rod extends in the direction of entering and exiting the inner cavity; the inner cavity of the casing is provided with a guide groove at the corresponding top position of the spray device, and the guide rod is connected with the guide groove when the spray device enters and exits the inner cavity. When the spray device enters and exits the inner cavity of the casing, it can move smoothly through the cooperation of the guide rod and the guide groove. The guide rod extends in the direction of entering and exiting the inner cavity, providing a clear movement path and stable support for the spray device, effectively avoiding misplacement during disassembly and installation, and facilitating the disassembly efficiency of the spray device.

[0014] As a further improvement of the above scheme, in the cross section of the extension direction of the guide rod, the guide rod is provided with a connecting part, the upper end of the connecting part protrudes towards both sides to form a guide protrusion; the bottom of the guide groove is provided with a through hole, and when the guide rod is connected with the guide groove, the connecting part and the through hole are matched with each other, and the lower edge of the guide protrusion abuts with the bottom of the guide groove. It should be noted that the whole spray device has a large mass, and without auxiliary support during disassembly, it is easy to cause installation inclination due to one side being heavier. The guide protrusion abuts on the bottom of the guide groove to provide support for the spray device, ensuring the disassembly efficiency of the spray device.

[0015] As a further improvement of the above scheme, the spray head comprises a small spray head and a large spray head; each spray head on the same branch pipe is of the same size, and the spray heads of adjacent two branch pipes are of different sizes. It should be noted that the conventional spray device generally densely arranges small spray heads to improve the spray cleaning effect, but the dense arrangement of small spray heads will cause the water pressure to be too small, which will affect the spray effect. By arranging each spray head on the same branch pipe to be of the same size, and arranging the spray heads of adjacent two branch pipes to be of different sizes, the water pressure sprayed by the spray head can be effectively balanced, and the spray effect can be ensured.

[0016] As a further improvement of the above scheme, the small spray head is fixed towards the fin core, and the small spray head sprays fan-shaped water mist towards the outer surface of the fin core; the large spray head is a rotary spray head, and the large spray head sprays water mist in the circumferential direction of the rotary shaft. The concentrated spray of the small spray head is conducive to cleaning the residues on the surface of the fin core; at the same time, the rotary spray of the rotary spray head increases the water spray area, and the cleaning effect can be ensured.

[0017] As a further improvement of the above scheme, the outer side of the mounting end plate is further provided with a plurality of handles, and the handles are arranged in intervals from top to bottom. The handles provide a point of effort for the maintenance personnel to pull out the spray device, and facilitate the maintenance personnel to disassemble and assemble the spray device.

[0018] As a further improvement of the above scheme, the inner cavity bottom is further provided with a water collecting groove, and the opening of the water collecting groove faces upwards; the water collecting groove is arranged to be inclined from high to low towards one end, and the lower end of the inclination is provided with a drain port; the water sprayed by the spray device falls into the water collecting groove and is discharged through the drain port. The arrangement of the water collecting groove facilitates the concentration of spray waste water, and is conducive to the subsequent concentrated treatment of the spray waste water.

[0019] Beneficial effects:

[0020] The mounting end plate of the spray device is detachably connected with the mounting opening of the shell, so that the spray device can be separated from the shell, which is conducive to the maintenance and cleaning of the spray head, reduces the workload and safety risk of the maintenance personnel, improves the spray cleaning effect, ensures the efficient operation of the finned heat exchanger, effectively solves the problems in the prior art, and provides technical support for the environmental protection and energy efficiency improvement of washing powder production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of the spray device and the shell connected in embodiment 1.

[0022] Figure 2 It is a top view of the spray device and the shell connected in embodiment 1.

[0023] Figure 3 It is a side view of the spray device and the shell connected in embodiment 1.

[0024] Figure 4 Structure diagram of large spray head and small spray head of the spraying device of example 1;

[0025] Figure 5 Connection diagram of guide rod and guide groove of the spraying device of example 1;

[0026] Figure 6 Installation diagram of the spraying device of example 1 on the finned heat exchanger;

[0027] Figure 7 Front view of the spraying device connected with the casing of example 2;

[0028] Figure 8 Top view of the spraying device connected with the casing of example 2;

[0029] Figure 9 Side view of the spraying device connected with the casing of example 2;

[0030] Reference signs:

[0031] C1, finned heat exchanger;

[0032] 1, casing; 11, input port; 12, output port; 13, mounting through hole; 14, guide groove; 141, through hole; 15, water collecting groove; 151, drain port;

[0033] 2, finned core;

[0034] 3, spraying device; 31, mounting end plate; 32, water receiving pipe; 33, branch pipe; 331, first branch pipe; 332, second branch pipe; 34, water outlet; 35, spray head; 351, small spray head; 352, large spray head; 3521, rotating head; 3522, discharge nozzle; 37, handle; 38, support pipe;

[0035] 4, flange plate; 41, through hole;

[0036] 5, pressing plate; 51, notch;

[0037] 6, guide rod; 61, connecting part; 62, guide protrusion. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] Example 1

[0040] like Figures 1-6 As shown, a detachable spray device for a finned heat exchanger is provided on a finned heat exchanger C1. The finned heat exchanger C1 includes a housing 1 with a hollow inner cavity. The housing 1 is provided with an inlet 11 and an outlet 12 that communicate with the inner cavity. Multiple finned cores 2 are arranged in parallel in the inner cavity. Fluid enters the inner cavity from the inlet 11, exchanges heat with the finned cores 2, and is then discharged from the outlet 12. A corresponding spray device 3 is provided on one side of each finned core 2. Along the extending direction of the inner cavity of the housing 1, the finned cores 2 and the spray devices 3 are distributed in an alternating pattern.

[0041] The side wall of the housing 1 has corresponding mounting openings 13 at each spray device 3, through which the spray device 3 enters and exits the inner cavity. Each spray device 3 has a mounting end plate 31 that is compatible with the mounting opening 13, and is detachably connected to the mounting opening 13 via the mounting end plate 31. In this embodiment, the mounting end plate 31 has a flange 4 with multiple through holes 41 along its circumferential edge. Fasteners pass through the through holes 41 to detachably connect the mounting end plate 31 to the mounting opening 13. Specifically, the fasteners can be screws or bolts, and the mounting opening 13 has corresponding threaded holes. The multiple through holes 41 on the flange 4 enhance the flexibility and efficiency of disassembly and reassembly. When it is necessary to inspect or replace the nozzles 35 of the spray device 3 behind the mounting end plate 31, the maintenance personnel can quickly pull out the spray device 3 for inspection by disassembling the connection point, without having to manually crawl into the narrow inner cavity of the casing 1, thus ensuring work safety and improving work efficiency.

[0042] A water inlet pipe 32 is fixedly connected to the mounting end plate 31. One end of the water inlet pipe 32 protrudes from the outside of the mounting end plate 31 and is connected to an external water source via a pipeline. The other end of the water inlet pipe 32 extends along the inside of the mounting end plate 31 and connects to several branch pipes 33. In this embodiment, the branch pipes 33 are parallel to each other, and the water inlet pipe 32 and each branch pipe 33 are on the same common plane. The normal direction of this common plane is perpendicular to the direction in which the spray device 3 enters and exits the inner cavity. This layout, where the normal direction of the common plane is perpendicular to the direction in which the spray device 3 enters and exits the inner cavity, makes disassembly and maintenance more convenient. Maintenance personnel can easily disassemble and install the spray device 3 along the vertical direction without complex rotation or adjustment, which not only saves space but also improves the stability and safety of operation.

[0043] Each branch pipe 33 is provided with a plurality of water outlets 34, and each water outlet 34 of each branch pipe 33 is provided with a spray head 35; the water collector 32 introduces the water source into the water outlets 34 of each branch pipe 33, and sprays out from the spray head 35. In this embodiment, the spray head 35 includes a small spray head 351 and a large spray head 352; each spray head 35 on the same branch pipe 33 is of the same size, and the spray heads 35 of adjacent two branch pipes 33 are of different sizes. Specifically, the branch pipe 33 provided with the small spray head 351 is a first branch pipe 331, the branch pipe 33 provided with the large spray head 352 is a second branch pipe 332, and the first branch pipe 331 and the second branch pipe 332 are arranged in a staggered manner from top to bottom. It should be noted that the conventional spray device 3 generally densely arranges small spray heads 351 to improve the spray cleaning effect, but the dense arrangement of small spray heads 351 will cause the water pressure to be too small, which will affect the spray effect. By arranging each spray head 35 on the same branch pipe 33 to be of the same size, and arranging the spray heads 35 of adjacent two branch pipes 33 to be of different sizes, the water pressure sprayed by the spray head 35 can be effectively balanced, and the spray effect can be ensured.

[0044] In this embodiment, the small spray head 351 is fixedly directed toward the finned core 2, and the small spray head 351 sprays fan-shaped water mist toward the outer surface of the finned core 2; the large spray head 352 is a rotary spray head 35, and the large spray head 352 sprays water mist in the circumferential direction of the rotary shaft thereof. Specifically, the number of small spray heads 351 on a single branch pipe 33 is greater than the number of large spray heads 352, and the branch pipe 33 provided with the large spray head 352 further extends a support pipe 38 at the water outlet 34, and the large spray head 352 is installed at the end of the support pipe 38, thereby providing space for rotation of the large spray head 352. In this embodiment, the large spray head 352 includes a rotary head 3521, and the rotary head 3521 is provided with three discharge nozzles 3522. Water passes through the large spray head 352, drives the three discharge nozzles 3522 to rotate by the rotary head 3521, and sprays water mist. In other embodiments, the number of discharge nozzles 3522 can also be four or five, and the number of discharge nozzles 3522 can be adjusted according to different application scenarios. The concentrated spray of the small spray head 351 is conducive to cleaning the residues on the surface of the finned core 2; at the same time, the rotary spray of the rotary spray head 35 increases the water spray area, and the cleaning effect can be ensured.

[0045] In the embodiment, the top of the water collecting pipe 32 is further fixed with a guide rod 6 extending in the direction of entering and leaving the inner cavity; the inner cavity of the shell 1 is provided with a guide groove 14 at the corresponding top position of the spraying device 3, and the guide rod 6 is connected with the guide groove 14 when the spraying device 3 enters and leaves the inner cavity. When the spraying device 3 enters and leaves the inner cavity of the shell 1, the guide rod 6 and the guide groove 14 can be matched to realize smooth movement. The guide rod 6 extends in the direction of entering and leaving the inner cavity, which provides a clear movement path and stable support for the spraying device 3, effectively avoids misplacement during disassembly and assembly, and is beneficial to improve the disassembly and assembly efficiency of the spraying device 3. Specifically, on the cross section in the extension direction of the guide rod 6, the guide rod 6 is provided with a connecting portion 61, the upper end of the connecting portion 61 protrudes towards both sides to form a guide protrusion 62; the bottom of the guide groove 14 is provided with a through hole 141, and the connecting portion 61 and the through hole 141 are matched with each other when the guide rod 6 is connected with the guide groove 14, and the lower edge of the guide protrusion 62 abuts against the bottom of the guide groove 14. It should be noted that the spraying device 3 has a large mass, and if there is no auxiliary support during disassembly and assembly, the installation may be inclined due to the weight of one side. The guide protrusion 62 abuts against the bottom of the guide groove 14 to provide support for the spraying device 3, thereby ensuring the disassembly and assembly efficiency of the spraying device 3.

[0046] In the embodiment, the outer side of the mounting end plate 31 is further provided with a plurality of handles 37, and the handles 37 are arranged at intervals from top to bottom. The handles 37 provide a force point for the maintenance personnel to pull out the spraying device 3, and facilitate the maintenance personnel to disassemble and assemble the spraying device 3. In the embodiment, the inner cavity is further provided with a water collecting groove 15, and the opening of the water collecting groove 15 faces upwards; the water collecting groove 15 is arranged to tilt from high to low towards one end, and the lower end of the tilt is provided with a drain hole 151; the water sprayed by the spraying device 3 falls into the water collecting groove 15 and is discharged through the drain hole 151. The water collecting groove 15 is arranged to facilitate the collection of the spraying waste water, which is beneficial to the subsequent centralized treatment of the spraying waste water.

[0047] Through the above scheme of the utility model, in specific application: by disassembling and connecting the mounting end plate 31 of the spraying device 3 and the mounting opening 13 of the shell 1, the spraying device 3 can be separated from the shell 1, which is beneficial to the maintenance and cleaning of the spray head 35, reduces the workload and safety risk of the maintenance personnel, improves the spraying and cleaning effect, ensures the efficient operation of the finned heat exchanger C1, effectively solves the defects in the prior art, and provides technical support for the environmental protection and energy efficiency improvement of washing powder production.

[0048] Embodiment 2

[0049] One of the embodiments of the utility model, the main technical scheme of this embodiment is same with example 1, the features not explained in this embodiment adopt the explanation in example 1, and here will not be repeated.The difference between this embodiment and example 1 is that:

[0050] As shown in Figures 7-9 In this embodiment, a plurality of pressing plates 5 are fixed on the outer side of the mounting end plate 31 from top to bottom, and the two ends of the pressing plate 5 extend out of the mounting end plate 31, respectively. The end of the pressing plate 5 extending out is provided with a slot 51. A fastener passes through the slot 51 to detachably connect the mounting end plate 31 to the mounting opening 13. Specifically, the slot 51 is a semi-open U-shaped slot. The slot 51 on the pressing plate 5 is detachably connected to the mounting opening 13, further enhancing the flexibility of disassembly. Maintenance personnel can gradually detach the pressing plate 5, reducing the difficulty of disassembly. The slot 51 at the end of the pressing plate 5 is designed to facilitate the operation of the fastener, making the disassembly process smoother.

[0051] According to the disclosure and teaching of the above description, those skilled in the art of the utility model can also make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above. Some modifications and changes to the utility model should fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the utility model.

Claims

1. A detachable spraying device of a finned heat exchanger, which is arranged on a finned heat exchanger, the finned heat exchanger comprising a casing having a hollow inner cavity, the casing being provided with an input port and an output port which are in communication with the inner cavity; a plurality of fin cores are arranged in parallel in the inner cavity, fluid entering the inner cavity from the input port and being sent out from the output port after heat exchange with the fin cores; characterized in that, Each fin core is provided with a corresponding spraying device on one side thereof; The fin core and the spraying device are arranged in an interlaced manner along the extending direction of the inner cavity of the casing; the casing side wall is provided with a corresponding mounting opening at each spraying device, and the spraying device enters and exits the inner cavity through the mounting opening; the spraying device is provided with a mounting end plate which is adapted to the mounting opening and detachably connected to the mounting opening through the mounting end plate; A water receiving pipe is fixed to the mounting end plate, one end of the water receiving pipe is exposed to the outside of the mounting end plate and is connected to an external water source through a pipeline; the other end of the water receiving pipe extends along the inner side of the mounting end plate and is connected to a plurality of branch pipes; each branch pipe is provided with a plurality of water outlets, and each water outlet of each branch pipe is provided with a spray head; the water source is introduced into the water outlets of each branch pipe through the water receiving pipe and is sprayed from the spray head.

2. A removable spray device for a finned heat exchanger according to claim 1, wherein A flange is arranged on the mounting end plate, and a plurality of through holes are arranged along the circumferential edge of the flange; a fastener passes through the through holes to detachably connect the mounting end plate to the mounting opening.

3. A removable spray device for a finned heat exchanger according to claim 1, wherein A plurality of pressing plates are fixed to the outer side of the mounting end plate at intervals from top to bottom, the two ends of each pressing plate extend out of the mounting end plate, and the end of each pressing plate extending out is provided with a slot; a fastener passes through the slot to detachably connect the mounting end plate to the mounting opening.

4. A removable spray device for a finned heat exchanger according to claim 2 or 3, characterised in that, The branch pipes are parallel to each other, and the water receiving pipe and each branch pipe are in the same common plane; the normal direction of the common plane is perpendicular to the direction in which the spraying device enters and exits the inner cavity.

5. A removable spray device for a finned heat exchanger according to claim 4, wherein A guide rod is further fixed to the top of the water receiving pipe, and the guide rod extends in the direction in which the spraying device enters and exits the inner cavity; the inner cavity of the casing is provided with a guide groove at the top position corresponding to the spraying device, and the guide rod is connected to the guide groove when the spraying device enters and exits the inner cavity.

6. A removable spray device for a finned heat exchanger according to claim 5, wherein In the cross section in the extending direction of the guide rod, a connecting portion is arranged on the guide rod, the upper end of the connecting portion protrudes towards both sides to form a guide protrusion; a through hole is arranged in the middle of the bottom of the guide groove, and the connecting portion is adapted to the through hole when the guide rod is connected to the guide groove, and the lower edge of the guide protrusion abuts against the bottom of the guide groove.

7. A removable spray device for a finned heat exchanger according to claim 2 or 3, wherein The spray head includes a small spray head and a large spray head; each spray head on the same branch pipe is the same size, and the spray heads of adjacent two branch pipes are different in size.

8. A removable spray device for a finned heat exchanger according to claim 7, wherein The small spray head is fixed towards the fin core, and the small spray head sprays fan-shaped water mist towards the outer surface of the fin core; the large spray head is a rotary spray head, and the large spray head sprays water mist in the circumferential direction of the rotary shaft.

9. A removable spray device for a finned heat exchanger according to claim 2 or 3, wherein A plurality of handles are further arranged on the outer side of the mounting end plate, and the handles are arranged at intervals from top to bottom.

10. A removable spray device for a finned heat exchanger according to claim 2 or 3, wherein A water collecting tank is further arranged at the bottom of the inner cavity, and the opening of the water collecting tank faces upwards; the water collecting tank is arranged to be inclined from high to low towards one end, and the lower end of the inclined water collecting tank is provided with a drain opening; the water sprayed by the spraying device falls into the water collecting tank and is discharged through the drain opening.

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