CN117019764A

CN117019764A - Equipment cleaning device

Info

Publication number: CN117019764A
Application number: CN202310953077.XA
Authority: CN
Inventors: 黄向东; 郑永杰; 庞美伶; 周立丽
Original assignee: Ninth Hospital Of Joint Service Support Force Of Chinese Pla
Current assignee: Ninth Hospital Of Joint Service Support Force Of Chinese Pla
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2023-11-10

Abstract

The invention belongs to the technical field of cleaning, and particularly discloses a device cleaning device which comprises a device main body and a cleaning head, wherein an air supply port and an air extraction port are arranged on the cleaning head, a plurality of through holes are formed in the cleaning head, part of through holes are communicated with the air supply port, and the rest of through holes are communicated with the air extraction port; the device main body comprises an air outlet and an air return port, the air outlet is connected with the air supply port through a hose, and the air return port is connected with the air extraction port through a hose; the device body is capable of ejecting high-pressure air from the air outlet and sucking in air from the air return port. The invention solves the problems that dust flies upwards when the dust in the equipment is cleaned by using the blowing tool, the air is seriously polluted, the body health is damaged, the blowing tool only blows and does not suck, and the blowing tool only can cause the dust to fly in a chaotic way in an inner area of the equipment, but is difficult to blow out, and the cleaning effect is poor.

Description

Equipment cleaning device

Technical Field

The invention belongs to the technical field of cleaning, and particularly relates to a device cleaning device.

Background

Dust removal maintenance of equipment is a topic that equipment cannot be wound around in use. Some devices are placed in a storehouse for a long time, and the surface is covered with floating ash; some devices are provided with cooling fans and heat dissipation holes, so that dust is easy to accumulate. Since most devices cannot be directly washed, the device housing is usually required to be disassembled during dedusting maintenance, and then dust is blown off by using a blowing tool. This dust removal mode has the following problems: dust is raised in the soot blowing process, so that air is seriously polluted, and the health of a human body is damaged; the blowing tool only blows and does not suck, and for dust accumulation in equipment such as some radiating holes, the blowing tool only can make dust fly in a disordered way in an inner area, but is difficult to blow out, and the cleaning effect is poor.

Disclosure of Invention

The invention provides a device cleaning device, which aims to solve the problems that dust flies, seriously pollutes air and damages body health when dust in a device is cleaned by using a blowing tool, and the blowing tool only blows and does not suck dust in the device, and can only cause the dust to fly in a chaotic way in an inner area but is difficult to blow out and has poor cleaning effect.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the equipment cleaning device comprises a device main body and a cleaning head, wherein an air supply port and an air extraction port are arranged on the cleaning head, a plurality of through holes are formed in the cleaning head, part of through holes are communicated with the air supply port, and the other through holes are communicated with the air extraction port; the device main body comprises an air outlet and an air return port, the air outlet is connected with the air supply port through a hose, and the air return port is connected with the air extraction port through a hose; the device body is capable of ejecting high-pressure air from the air outlet and sucking in air from the air return port.

Further, the cleaning head includes a cleaning portion and a sliding portion; the front surface of the cleaning part is provided with a plurality of rows and a plurality of columns of through holes, the back surface of the cleaning part is provided with a plurality of longitudinal groove bodies, and each longitudinal groove body is communicated with all the through holes in one or a plurality of columns; the distance between adjacent longitudinal groove bodies is the same; at least four flow passages are arranged in the sliding part, and comprise a first air supply flow passage, a first air extraction flow passage, a second air supply flow passage and a second air extraction flow passage, wherein the four flow passages are distributed at different heights of the sliding part and do not interfere with each other; the first air supply flow channel is communicated with the air supply port and is provided with a plurality of outlets, and the transverse distance between two adjacent outlets is equal to twice the distance between two adjacent longitudinal groove bodies; the first air suction flow passage is communicated with the air suction opening and is provided with a plurality of inlets, and the transverse distance between two adjacent inlets is equal to twice the distance between two adjacent longitudinal groove bodies; the second air supply flow channel is communicated with the air supply port and is provided with a plurality of groups of outlets, the transverse distance between two adjacent outlets in each group of outlets is equal to the distance between the adjacent longitudinal grooves, and the transverse distance between the outlets in different groups is n+1 times the distance between the adjacent longitudinal grooves on the assumption that the number of the outlets in each group of outlets is n; the second air extraction flow passage is communicated with the air extraction opening and is provided with a plurality of groups of inlets, the transverse distance between two adjacent inlets in each group of inlets is equal to the distance between adjacent longitudinal grooves, the number of outlets of each group of inlets is n, and the transverse distance between different groups of inlets is n+1 times of the distance between adjacent longitudinal grooves; the number of outlets or inlets of the four flow channels is equal to the number of the longitudinal grooves; the outlets of the first air supply flow channels and the inlets of the first air extraction flow channels are distributed at intervals in the horizontal direction at the distance from the adjacent longitudinal groove bodies, the outlets of the second air supply flow channels and the inlets of the second air extraction flow channels are distributed in an interpenetration mode in the horizontal direction, and one outlet or one inlet is arranged at each distance from the longitudinal groove bodies; the sliding part slides relative to the cleaning part so as to switch the flow channel; when switching to the first air supply flow channel and the first air extraction flow channel, each inlet and each outlet of the two flow channels are correspondingly communicated with a longitudinal groove body, and at the moment, the inlets and the outlets of the second air supply flow channel and the second air extraction flow channel are blocked by the cleaning part; when the first air supply flow channel and the first air extraction flow channel are switched to the second air supply flow channel and the second air extraction flow channel, each inlet and each outlet of the two flow channels are correspondingly communicated with one longitudinal groove body, and at the moment, the inlet and the outlet of the first air supply flow channel and the inlet and the outlet of the first air extraction flow channel are blocked by the cleaning part.

Further, the number of cleaning heads is plural.

Further, the cleaning heads are of different sizes.

Further, the device main body comprises a main box body, the air outlet is arranged in the middle of the main box body, and the air return port is arranged at the upper part of the main box body; the downstream of the air outlet is connected with a suction pump, and the downstream of the suction pump is connected with a cleaning head; a filter assembly is arranged in the main box body below the air outlet, and is horizontally arranged in the main box body; a drain outlet is arranged at the bottom of the main box body below the filtering component, and a drain valve is arranged; an intermediate baffle is arranged in the main box body between the air outlet and the air return port, and the air return port is communicated with the lower surface of the filter assembly through a bypass flow passage, so that the air outlet and the air return port cannot be directly communicated, and can only be communicated through the filter assembly; the lower surface of middle baffle is provided with water spray subassembly, and water spray subassembly is connected with the water source, can spray water to filtering component.

Further, the water spraying assembly comprises a plurality of water spraying ports which are uniformly distributed above the filtering assembly.

Further, the device main body also comprises a water tank, and the water tank is arranged above the main box body; the bottom of the water tank is communicated with the water spraying assembly through a water spraying pipeline, and a water spraying valve is arranged on the water spraying pipeline.

Further, the top of the water tank is provided with a water filling port, and a water filling valve is arranged on the water filling port.

Compared with the prior art, the invention has at least the following beneficial effects:

1. the invention sprays high pressure air from part of through holes to blow off dust on the equipment to be cleaned, and the other part of through holes generates high negative pressure to suck the dust into the device main body. Through blowing and sucking simultaneously, dust is blown off and sucked away, and the problems that dust flies upwards and seriously pollutes air and damages health caused by cleaning equipment by using a blowing tool are solved. When the dust is removed from the inner area of the equipment such as the radiating hole, the dust in the area is blown up by the air flowing at high speed, the air is scattered in the area, the air is sucked from the area by the air suction through holes, and meanwhile, the flying dust is sucked, so that the problems that the blowing tool only blows out and does not suck, and the dust is accumulated in the equipment, the blowing tool only can fly the dust in the inner area in a disordered manner, but is difficult to blow out and has poor cleaning effect are solved.

2. The invention distributes air injection and air suction at intervals, and the cleaning head is close to the equipment to be cleaned, and sucks ash while blowing ash, so that most blown dust can be directly sucked away, secondary pollution caused by secondary adhesion of the dust is avoided, and air pollution caused by flying dust is avoided. By switching the flow channels, the distribution interval of blowing and sucking can be changed so as to adapt to the equipment to be cleaned with different sizes and depths.

3. The dust-proof filter disclosed by the invention is convenient and practical, and dust is blocked below the filter assembly and is easily cleaned by water.

Drawings

FIG. 1 is a block diagram of a cleaning apparatus for an apparatus of the present invention;

FIG. 2 is a perspective view of a cleaning head of the present invention;

FIG. 3 is a flow path layout in a cleaning head according to the present invention;

figure 4 is a schematic view of yet another flow path arrangement in a cleaning head of the present invention.

In the figure: 100-device body, 110-main box, 111-gas outlet, 112-return, 113-suction pump, 114-filter assembly, 115-drain, 116-drain valve, 117-intermediate baffle, 118-bypass flow channel, 119-water spray assembly, 120-water tank, 121-water injection valve, 130-water spray pipe, 140-water spray valve, 200-cleaning head, 210-cleaning part, 211-through hole, 212-longitudinal tank, 220-sliding part, 221-gas supply port, 222-gas extraction port, 223-outlet, 224-inlet, 230-first gas supply flow channel, 240-first gas extraction flow channel, 250-second gas supply flow channel, 260-second gas extraction flow channel.

Detailed Description

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention.

In the description of the present embodiment, it should also be noted that the terms "disposed," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise.

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 4, the present embodiment discloses a device cleaning apparatus including an apparatus main body 100 and a cleaning head 200. The cleaning head 200 is provided with an air supply port 221 and an air extraction port 222, and is provided with a plurality of through holes 211, wherein part of the through holes 211 are communicated with the air supply port 221, and the rest of the through holes 211 are communicated with the air extraction port 222. The device main body 100 includes an air outlet 111 and an air return port 112, the air outlet 111 and the air supply port 221 are connected by a hose, and the air return port 112 and the air extraction port 222 are connected by a hose. The apparatus main body 100 can discharge high-pressure air from the air outlet 111 and suck the air from the air return port 112.

When the cleaning device is used, the device main body 100 is opened, the through holes 211 of the cleaning head 200 face to the equipment to be cleaned, part of the through holes 211 spray high-pressure air to blow off dust on the equipment to be cleaned, and the other part of the through holes 211 generate high negative pressure to suck the dust into the device main body 100. Through blowing and sucking simultaneously, dust is blown off and sucked away, and the problems that dust flies upwards and seriously pollutes air and damages health caused by cleaning equipment by using a blowing tool are solved. When the dust is removed from the interior area of the equipment such as the radiating hole, the dust in the area is blown up by the air flowing at a high speed, the air is scattered in the area, the air is sucked from the area by the air suction through holes 211, and meanwhile, the flying dust is sucked, so that the problems that the blowing tool only blows out and does not suck, and the dust is accumulated in the equipment, the blowing tool only can fly in the interior area in a scattered manner, but is difficult to blow out and has poor cleaning effect are solved.

The cleaning head 200 includes a cleaning portion 210 and a sliding portion 220. The cleaning part 210 has a front surface provided with a plurality of rows and columns of through holes 211, and a rear surface provided with a plurality of longitudinal grooves 212, and each longitudinal groove 212 is communicated with all the through holes 211 in one or more columns. The distance between adjacent longitudinal channels 212 is the same. At least four flow channels are arranged in the sliding part 220, and the four flow channels comprise a first air supply flow channel 230, a first air extraction flow channel 240, a second air supply flow channel 250 and a second air extraction flow channel 260, and are distributed at different heights of the sliding part 220 and do not interfere with each other. The first air supply flow passage 230 communicates with the air supply port 221 and is provided with a plurality of outlet ports 223, and the lateral distance between adjacent two outlet ports 223 is equal to twice the distance between adjacent longitudinal grooves 212. The first pumping flow channel 240 communicates with the pumping port 222 and is provided with a plurality of inlets 224, and the lateral distance between two adjacent inlets 224 is equal to twice the distance between adjacent longitudinal grooves 212. The second air supply flow passage 250 communicates with the air supply port 221 and is provided with a plurality of sets of outlets 223, wherein the lateral distance between two adjacent outlets 223 in each set of outlets 223 is equal to the distance between the adjacent longitudinal grooves 212, and the lateral distance between the different sets of outlets 223 is n+1 times the distance between the adjacent longitudinal grooves 212 provided that the number of outlets 223 in each set of outlets 223 is n. The second pumping flow channel 260 is communicated with the pumping hole 222 and is provided with a plurality of groups of inlets 224, the transverse distance between two adjacent inlets 224 in each group of inlets 224 is equal to the distance between two adjacent longitudinal grooves 212, the number of outlets 223 of each group of inlets 224 is n, and the transverse distance between the inlets 224 in different groups is n+1 times the distance between the adjacent longitudinal grooves 212. The number of outlets 223 or the number of inlets 224 of the four flow channels is equal to half the number of the longitudinal grooves 212. The outlet 223 of the first air supply flow path 230 and the inlet 224 of the first air extraction flow path 240 are horizontally spaced apart from each other by a distance between adjacent longitudinal grooves 212, and the outlet 223 of the second air supply flow path 250 and the inlet 224 of the second air extraction flow path 260 are horizontally spaced apart from each other by one outlet 223 or inlet 224 each distance between the longitudinal grooves 212. The sliding portion 220 slides with respect to the cleaning portion 210, thereby performing flow path switching. When switching to the first air supply flow channel 230 and the first air extraction flow channel 240, referring to fig. 3 (for convenience of understanding, the flow channels in the sliding portion 220 are respectively projected to the lower side), each of the inlet 224 and the outlet 223 of the two flow channels is correspondingly communicated with one longitudinal groove 212, and at this time, both the inlet 224 and the outlet 223 of the second air supply flow channel 250 and the second air extraction flow channel 260 are blocked by the cleaning portion 210; when switching to the second air supply flow channel 250 and the second air extraction flow channel 260, referring to fig. 4 (for convenience of understanding, the flow channels in the sliding portion 220 are respectively projected to the lower side), each of the inlet 224 and the outlet 223 of the two flow channels is correspondingly communicated with one longitudinal groove 212, and at this time, both the inlet 224 and the outlet 223 of the first air supply flow channel 230 and the first air extraction flow channel 240 are blocked by the cleaning portion 210. Through the above technical scheme, the air injection and the air suction are distributed at intervals, the cleaning head 200 is close to the equipment to be cleaned, dust blowing and dust suction are performed at the same time, most of blown dust can be directly sucked away, secondary pollution caused by secondary adhesion of the dust is avoided, and air pollution caused by flying dust is avoided. By switching the flow channels, the distribution interval of blowing and sucking can be changed so as to adapt to the equipment to be cleaned with different sizes and depths. The larger the distribution interval of the blowing and the suction is, the smaller the influence of the suction on the blowing is, the longer the soot blowing distance is, the more easily the dust in the area which is difficult to get inside the equipment is cleaned, but sometimes the cross section of the passage leading to the inside of the equipment is small, if the distribution interval of the blowing and the suction is too large, the air cannot be simultaneously acted on the space inside the equipment, so that the distribution interval of the blowing and the suction is required to be adjustable. In addition, a smaller blow and suction distribution interval means less dusting when treating smaller equipment surfaces. Therefore, it is desirable to be able to adjust the distribution interval of the blowing and suction to accommodate different job requirements. It is envisioned that one skilled in the art could, based on the present embodiment, provide more flow channels to match more different distribution intervals of the blow and suction, while remaining within the scope of the disclosure of the present embodiment.

Further, a plurality of cleaning heads 200 having different sizes may be provided to be connected to the apparatus main body 100, and may be flexibly selected according to the operation requirement, or a plurality of cleaning heads 200 may be operated simultaneously. Those skilled in the art can set a valve to adjust the air flow of each cleaning head 200 according to actual needs, and detailed description thereof will be omitted.

The device main body 100 includes a main housing 110, an air outlet 111 is formed in the middle of the main housing 110, and an air return 112 is formed in the upper portion of the main housing 110. A suction pump 113 is connected downstream of the air outlet 111, and a cleaning head 200 is connected downstream of the suction pump 113. A filter assembly 114 is disposed in the main housing 110 below the air outlet 111, and the filter assembly 114 is horizontally installed in the main housing 110. A drain 115 is provided below the filter assembly 114 at the bottom of the main housing 110, and a drain valve 116 is provided. An intermediate baffle 117 is arranged in the main box 110 between the air outlet 111 and the air return 112, and the air return 112 is communicated with the lower surface of the filter assembly 114 through a bypass flow passage 118, so that the air outlet 111 and the air return 112 cannot be directly communicated, but can only be communicated through the filter assembly 114. The lower surface of the intermediate baffle 117 is provided with a water spray assembly 119, and the water spray assembly 119 is connected to a water source and can spray water to the filter assembly 114. In operation, the blow-down valve 116 is closed, the suction pump 113 supplies high pressure air to the downstream and negative pressure to the upstream, and the air carrying dust enters the main box 110 from the return air port 112 and passes through the bypass flow passage 118, is filtered by the filter assembly 114 and is pumped by the suction pump 113. Dust is blocked at the lower surface of the filter assembly 114. After the operation is completed, the drain valve 116 is opened, the water spray assembly 119 sprays water from above the filter assembly 114, and dust on the lower surface of the filter assembly 114 is washed away and discharged from the drain 115. The blow-down valve 116 can be closed periodically, the water spraying component 119 can continuously spray water, so that the main box 110 is full of water, the main box 110 can be cleaned in all directions, the air outlet 111 and the air return port 112 are required to be in a closed state, a valve can be arranged, a hose can be pulled out from the main body of the equipment, and measures are taken to seal the air outlet 111 and the air return port 112. Further, the cleaning of the main casing 110 may be facilitated in a shaking manner. Further, the water jet assembly 119 includes a plurality of water jets uniformly distributed over the filter assembly 114.

The apparatus body 100 further includes a water tank 120, and the water tank 120 is disposed above the main casing 110. The bottom of the water tank 120 is communicated with the water spraying assembly 119 through a water spraying pipeline 130, and a water spraying valve 140 is arranged on the water spraying pipeline 130. The top of the water tank 120 is provided with a water filling port on which a water filling valve 121 is installed.

The foregoing description of the preferred embodiments of the present invention should not be taken as limiting the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. The equipment cleaning device comprises a device main body (100) and a cleaning head (200), and is characterized in that an air supply port (221) and an air extraction port (222) are arranged on the cleaning head (200), a plurality of through holes (211) are formed, part of the through holes (211) are communicated with the air supply port (221), and the rest of the through holes (211) are communicated with the air extraction port (222); the device main body (100) comprises an air outlet (111) and an air return port (112), the air outlet (111) is connected with the air supply port (221) through a hose, and the air return port (112) is connected with the air extraction port (222) through a hose; the device body (100) can jet high-pressure air from the air outlet (111) and suck air from the air return port (112).

2. The device cleaning apparatus of claim 1, wherein the cleaning head (200) comprises a cleaning portion (210) and a sliding portion (220); the front surface of the cleaning part (210) is provided with a plurality of rows and a plurality of columns of through holes (211), the back surface of the cleaning part is provided with a plurality of longitudinal groove bodies (212), and each longitudinal groove body (212) is communicated with all the through holes (211) in one column or a plurality of columns; the distance between adjacent longitudinal groove bodies (212) is the same; at least four flow channels are arranged in the sliding part (220), and comprise a first air supply flow channel (230), a first air extraction flow channel (240), a second air supply flow channel (250) and a second air extraction flow channel (260), wherein the four flow channels are distributed at different heights of the sliding part (220) and do not interfere with each other; the first air supply flow channel (230) is communicated with the air supply port (221) and is provided with a plurality of outlets (223), and the transverse distance between two adjacent outlets (223) is equal to twice the distance between two adjacent longitudinal groove bodies (212); the first air extraction flow passage (240) is communicated with the air extraction opening (222) and is provided with a plurality of inlets (224), and the transverse distance between two adjacent inlets (224) is equal to twice the distance between two adjacent longitudinal groove bodies (212); the second air supply flow channel (250) is communicated with the air supply port (221) and is provided with a plurality of groups of outlets (223), the transverse distance between two adjacent outlets (223) in each group of outlets (223) is equal to the distance between two adjacent longitudinal grooves (212), and the transverse distance between the outlets (223) in different groups is n+1 times the distance between the adjacent longitudinal grooves (212) provided that the number of the outlets (223) in each group of outlets (223) is n; the second air extraction flow passage (260) is communicated with the air extraction opening (222) and is provided with a plurality of groups of inlets (224), the transverse distance between two adjacent inlets (224) in each group of inlets (224) is equal to the distance between two adjacent longitudinal groove bodies (212), the number of outlets (223) of each group of inlets (224) is n, and the transverse distance between the inlets (224) in different groups is n+1 times the distance between the adjacent longitudinal groove bodies (212); the number of the outlets (223) or the number of the inlets (224) of the four flow channels are equal and are half of the number of the longitudinal groove bodies (212); the outlet (223) of the first air supply flow channel (230) and the inlet (224) of the first air extraction flow channel (240) are distributed at intervals in the horizontal direction by the distance between adjacent longitudinal groove bodies (212), the outlet (223) of the second air supply flow channel (250) and the inlet (224) of the second air extraction flow channel (260) are distributed in the horizontal direction in an interpenetration way, and one outlet (223) or one inlet (224) is arranged at each distance from the longitudinal groove bodies (212); the sliding part (220) slides relative to the cleaning part (210) so as to switch the flow channel; when switching to the first air supply flow channel (230) and the first air extraction flow channel (240), each of the inlet (224) and the outlet (223) of the two flow channels is correspondingly communicated with one longitudinal groove body (212), and at the moment, the inlet (224) and the outlet (223) of the second air supply flow channel (250) and the second air extraction flow channel (260) are blocked by the cleaning part (210); when switching to the second air supply flow channel (250) and the second air extraction flow channel (260), each of the inlet (224) and the outlet (223) of the two flow channels is correspondingly communicated with one longitudinal groove body (212), and at the moment, the inlet (224) and the outlet (223) of the first air supply flow channel (230) and the first air extraction flow channel (240) are blocked by the cleaning part (210).

3. The device cleaning apparatus according to claim 2, wherein the number of cleaning heads (200) is a plurality.

4. A device cleaning apparatus according to claim 3, characterized in that the cleaning heads (200) are of different sizes.

5. The equipment cleaning device according to claim 1, wherein the device main body (100) includes a main casing (110), the air outlet (111) is opened at a middle portion of the main casing (110), and the air return port (112) is opened at an upper portion of the main casing (110); a suction pump (113) is connected to the downstream of the air outlet (111), and the downstream of the suction pump (113) is connected with the cleaning head (200); a filter assembly (114) is arranged below the air outlet (111) in the main box body (110), and the filter assembly (114) is horizontally arranged in the main box body (110); a drain outlet (115) is formed in the bottom of the main box body (110) below the filtering component (114), and a drain valve (116) is arranged; an intermediate baffle (117) is arranged in the main box body (110) between the air outlet (111) and the air return port (112), and the air return port (112) is communicated with the lower surface of the filter assembly (114) through a bypass flow passage (118), so that the air outlet (111) and the air return port (112) cannot be directly communicated, and can only be communicated through the filter assembly (114); the lower surface of the middle baffle plate (117) is provided with a water spraying assembly (119), and the water spraying assembly (119) is connected with a water source and can spray water to the filtering assembly (114).

6. The device cleaning apparatus of claim 5, wherein the water jet assembly (119) comprises a plurality of water jets evenly distributed over the filter assembly (114).

7. The device cleaning apparatus according to claim 5, wherein the apparatus main body (100) further comprises a water tank (120), the water tank (120) being disposed above the main tank (110); the bottom of the water tank (120) is communicated with the water spraying assembly (119) through a water spraying pipeline (130), and a water spraying valve (140) is arranged on the water spraying pipeline (130).

8. The equipment cleaning device according to claim 7, characterized in that the top of the water tank (120) is provided with a water filling port, on which a water filling valve (121) is mounted.