Intelligent automatic continuous dishwasher

Abstract

The invention provides an intelligent automatic continuous dishwasher, which belongs to the technical field of tableware cleaning, and comprises: a frame provided with a washing channel below which a water storage tank is arranged; one end of the water pump is connected with the bottom of the water storage tank through a water pump water inlet pipe, and the other end of the water pump is connected with a water pump water outlet pipe; the upper spraying assembly and the lower spraying assembly are located on the upper side and the lower side of the washing channel respectively, and the water inlet end of the upper spraying assembly and the water inlet end of the lower spraying assembly are both connected with a water outlet pipe of the water pump; the side spraying assembly is connected with the water pump water outlet pipe; the water storage tank, the water pump water inlet pipe, the water pump water outlet pipe, the upper spraying assembly, the lower spraying assembly and the side spraying assembly jointly form a water circulation system of the dish washing machine. The washing machine is small in size, tableware in the washing channel can be washed in all directions, the washing effect is improved, in addition, a water circulation system is constructed, and the utilization rate of water resources is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of tableware washing and relates to a dishwasher, in particular to an intelligent automatic continuous dishwasher. Background Art

[0002] Tableware washing equipment is mainly used for automatic cleaning of bowls, chopsticks, plates, dishes, knives, forks and other tableware, so as to reduce the labor intensity of catering service personnel in restaurants, canteens of government agencies, school canteens or hotels. With the continuous promotion of tableware washing equipment, various types of dishwashers are gradually entering the daily life of ordinary families.

[0003] However, existing dishwashing equipment generally adopts an assembly line cleaning method, which is bulky and occupies a large area, and has only a one-way flushing function and cannot clean the dishes thoroughly. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide an intelligent automatic continuous dishwasher with compact structure and capable of multi-directional washing.

[0005] The object of the present invention can be achieved by the following technical solutions: An intelligent automatic continuous dishwasher, comprising:

[0006] A frame, and a washing channel is arranged on the frame, and the two ends of the washing channel are a feeding end and a discharging end respectively, wherein a washing area is arranged on the washing channel, and a water storage tank is arranged below the washing area;

[0007] A water pump is installed on the frame, and one end of the water pump is connected to the bottom of the water tank through a water pump inlet pipe, and the other end of the water pump is connected to a water pump outlet pipe;

[0008] An upper spray assembly and a lower spray assembly, and the upper spray assembly and the lower spray assembly are respectively located at the upper and lower sides of the washing channel, wherein the spray direction of the upper spray assembly is from top to bottom, and the spray direction of the lower spray assembly is from bottom to top, and the water inlet end of the upper spray assembly and the water inlet end of the lower spray assembly are both connected to the water outlet pipe of the water pump;

[0009] The side spray assembly is located on one side of the upper spray assembly or the lower spray assembly, and the side spray assembly is connected to the water outlet pipe of the water pump, wherein two groups of side spray nozzles are arranged on the side spray assembly, and the two groups of side spray nozzles are arranged opposite to each other to form a counter-spraying;

[0010] Among them, the water tank, water pump inlet pipe, water pump outlet pipe, upper spray assembly, lower spray assembly and side spray assembly together constitute the water circulation system of the dishwasher.

[0011] In the above-mentioned intelligent automatic continuous dishwasher, the upper spray assembly includes an upper water guiding pipe connected to the water outlet pipe of the water pump, and a plurality of upper spray pipes arranged side by side are connected to the upper water guiding pipe, wherein a plurality of upper spray nozzles are arranged on the upper spray pipe along its length direction, and the spray direction of the upper spray nozzles is from top to bottom; the lower spray assembly includes a lower water guiding pipe connected to the water outlet pipe of the water pump, and a plurality of lower spray pipes arranged side by side are connected to the lower water guiding pipe, wherein a plurality of lower spray nozzles are arranged on the lower spray pipe along its length direction, and the spray direction of the lower spray nozzles is from bottom to top.

[0012] In the above-mentioned intelligent automatic continuous dishwasher, the positions of the upper spray pipe and the lower spray pipe correspond one to one, and the positions of the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe correspond one to one;

[0013] Or the positions of the upper spray pipe and the lower spray pipe correspond one to one, and the positions of the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are staggered;

[0014] Or the upper spray pipe and the lower spray pipe are arranged in a staggered manner, when the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are projected onto the same horizontal plane, the adjacent upper spray nozzle and the lower spray nozzle are on the same horizontal line;

[0015] Or the upper spray pipe and the lower spray pipe are staggered. When the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are projected onto the same horizontal plane, the adjacent upper spray nozzle and lower spray nozzle are staggered.

[0016] In the above-mentioned intelligent automatic continuous dishwasher, the side spray assembly includes a transition pipe connected to the water pump outlet pipe, and a side spray pipe connected to the transition pipe, wherein the side spray pipe is U-shaped, and the side spray nozzle is arranged on both sides of the opening direction of the side spray pipe, wherein the positions of the side spray nozzles on both sides of the opening end of the side spray pipe correspond one to one, or the positions of the side spray nozzles on both sides of the opening end of the side spray pipe are staggered.

[0017] In the above-mentioned intelligent automatic continuous dishwasher, it also includes a rinsing assembly, which is located on the other side of the upper spray assembly or the lower spray assembly and installed on the frame, wherein the rinsing assembly includes a vertically arranged support pipe and a rinsing pipe connected to the support pipe and arranged horizontally.

[0018] In the above-mentioned intelligent automatic continuous dishwasher, it also includes two guide rails, which are respectively located on both sides of the washing channel, and the guide rails are connected to the frame, wherein a column is connected to each end of each guide rail, and a clamping groove is arranged on one end of each column close to the upper spray assembly; and the pressing net, and each corner of the pressing net is clamped on the corresponding clamping groove, so that the entire pressing net presents a downward convex structure.

[0019] In the above-mentioned intelligent automatic continuous dishwasher, it also includes two movable door panels, which are respectively located on both sides of the washing channel, and the movable door panels are detachably connected to the frame.

[0020] In the above-mentioned intelligent automatic continuous dishwasher, an air collecting box is also arranged on the frame, and the air collecting box is located at the feeding end or the discharging end, wherein the air collecting box is connected to the washing area.

[0021] In the above-mentioned intelligent automatic continuous dishwasher, a control box is also included, and the control box is installed on the top of the rack.

[0022] In the above-mentioned intelligent automatic continuous dishwasher, a filter screen is arranged at the opening of the water storage tank.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The intelligent automatic continuous dishwasher provided by the present invention has a small size and can wash dishes in the washing channel from all directions, thereby improving the washing effect. In addition, a water circulation system is constructed to improve the utilization rate of water resources.

[0025] (2) By providing a rinsing component, the washed dishes can be rinsed again to improve the washing effect of the dishes. In addition, the water produced by rinsing is generally clean, which can not only replenish the water demand in the washing area, but also continuously update the water quality in the water storage tank, thereby improving the washing effect of the dishes.

[0026] (3) By setting up a rinsing component, in coordination with the upper spray component, the lower spray component and the side spray component, the entire washing area is completely covered, forming an all-round flushing of the entire washing area, thereby avoiding washing dead corners and improving the washing effect.

[0027] (4) By setting a pressure net, a downward pressure can be applied to lighter tableware, so that the tableware is always located in the washing channel, thereby improving the cleaning effect of the tableware.

[0028] (5) The reason why two movable door panels are provided instead of one door panel is that after the dishes are washed, the two movable door panels can be removed at the same time, so that the entire washing area is open, which is convenient for rinsing the entire washing area, avoiding food residues remaining in a corner of the washing area and causing mildew, thereby ensuring the cleanliness and hygiene of the entire dishwasher.

[0029] (6) By providing an air collecting box, on the one hand, the water vapor in the washing area can be guided out of the washing area to avoid the accumulation of water vapor; on the other hand, the guided water vapor can be guided to prevent the water vapor from rushing towards the operator, thereby ensuring the life safety of the operator.

[0030] (7) The control box is installed on the top of the rack, which not only improves the utilization rate of the space above the dishwasher, but also keeps the control box away from the water environment, thereby improving the electrical safety of the dishwasher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an intelligent automatic continuous dishwasher of the present invention.

[0032] Figure 2 It is a partial structural schematic diagram of an intelligent automatic continuous dishwasher of the present invention.

[0033] Figure 3 It is a partial exploded view of an intelligent automatic continuous dishwasher of the present invention.

[0034] Figure 4 It is a schematic structural diagram of an upper spray assembly, a lower spray assembly and a side spray assembly in a preferred embodiment of the present invention.

[0035] In the figure,

[0036] 100, rack; 110, guide rail; 120, column; 121, slot; 130, movable door panel; 140, gas collecting box;

[0037] 200, water storage tank; 210, overflow port; 220, overflow pipe; 230, filter screen;

[0038] 300, water pump; 310, water pump inlet pipe; 320, water pump outlet pipe;

[0039] 400, upper spray assembly; 410, upper water guide pipe; 420, upper spray pipe; 430, upper spray nozzle;

[0040] 500, lower spray assembly; 510, lower water guide pipe; 520, lower spray pipe; 530, lower spray nozzle;

[0041] 600, side spray assembly; 610, side spray nozzle; 620, side spray pipe;

[0042] 700, rinsing assembly; 710, support tube; 720, rinsing tube;

[0043] 800. Control box. DETAILED DESCRIPTION

[0044] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] like Figures 1 to 4 As shown, the present invention provides an intelligent automatic continuous dishwasher, comprising:

[0047] A frame 100 is provided with a washing channel, the two ends of which are a feeding end and a discharging end, respectively, wherein a washing area is provided on the washing channel, and a water storage tank 200 is provided below the washing area;

[0048] A water pump 300 is installed on the frame 100, and one end of the water pump 300 is connected to the bottom of the water storage tank 200 through a water pump water inlet pipe 310, and the other end of the water pump 300 is connected to a water pump outlet pipe 320;

[0049] An upper spray assembly 400 and a lower spray assembly 500, and the upper spray assembly 400 and the lower spray assembly 500 are respectively located at the upper and lower sides of the washing channel, wherein the spray direction of the upper spray assembly 400 is from top to bottom, and the spray direction of the lower spray assembly 500 is from bottom to top, and the water inlet end of the upper spray assembly 400 and the water inlet end of the lower spray assembly 500 are both connected to the water pump outlet pipe 320;

[0050] The side spray assembly 600 is located on one side of the upper spray assembly 400 or the lower spray assembly 500, and the side spray assembly 600 is connected to the water pump outlet pipe 320, wherein two groups of side spray nozzles 610 are arranged on the side spray assembly 600, and the two groups of side spray nozzles 610 are arranged opposite to each other to form a counter-spray.

[0051] The water storage tank 200, the water pump inlet pipe 310, the water pump outlet pipe 320, the upper spray assembly 400, the lower spray assembly 500 and the side spray assembly 600 together constitute the water circulation system of the dishwasher.

[0052] The intelligent automatic continuous dishwasher provided by the present invention has a small size and can wash dishes in a washing channel from all directions, thereby improving the washing effect. In addition, a water circulation system is constructed to improve the utilization rate of water resources.

[0053] Preferably, the upper spray assembly 400 includes an upper water guiding pipe 410 connected to the water pump outlet pipe 320, and a plurality of upper spray pipes 420 are connected to the upper water guiding pipe 410, wherein a plurality of upper spray nozzles 430 are arranged on the upper spray pipe 420 along its length direction, and the spray direction of the upper spray nozzles 430 is from top to bottom; the lower spray assembly 500 includes a lower water guiding pipe 510 connected to the water pump outlet pipe 320, and a plurality of lower spray pipes 520 are connected to the lower water guiding pipe 510, wherein a plurality of lower spray nozzles 530 are arranged on the lower spray pipe 520 along its length direction, and the spray direction of the lower spray nozzles 530 is from bottom to top.

[0054] It is worth mentioning that the layout of the upper spray pipe 420 and the lower spray pipe 520, and the layout of the upper spray nozzle 430 and the lower spray nozzle 530 can be arranged as follows, but are not limited to the layout described below.

[0055] In the first method, the positions of the upper spray pipe 420 and the lower spray pipe 520 correspond one to one, and the positions of the upper spray nozzles 430 on the upper spray pipe 420 and the lower spray nozzles 530 on the lower spray pipe 520 correspond one to one.

[0056] In the second method, the positions of the upper spray pipe 420 and the lower spray pipe 520 correspond one to one, and the upper spray nozzles 430 on the upper spray pipe 420 and the lower spray nozzles 530 on the lower spray pipe 520 are staggered.

[0057] Method three, the positions of the upper spray pipe 420 and the lower spray pipe 520 are staggered. When the upper spray nozzle 430 on the upper spray pipe 420 and the lower spray nozzle 530 on the lower spray pipe 520 are projected onto the same horizontal plane, the adjacent upper spray nozzle 430 and lower spray nozzle 530 are on the same horizontal line.

[0058] Method four, the positions of the upper spray pipe 420 and the lower spray pipe 520 are staggered. When the upper spray nozzle 430 on the upper spray pipe 420 and the lower spray nozzle 530 on the lower spray pipe 520 are projected onto the same horizontal plane, the adjacent upper spray nozzle 430 and lower spray nozzle 530 are staggered.

[0059] It is further pointed out that the water lines sprayed from the upper spray nozzle 430 and the lower spray nozzle 530 are arranged in a divergent manner, which can increase the washing area and further improve the cleaning effect.

[0060] Preferably, the side spray assembly 600 includes a transition pipe connected to the water pump outlet pipe 320, and a side spray pipe 620 connected to the transition pipe, wherein the side spray pipe 620 is U-shaped, and the side spray nozzles 610 are arranged on both sides of the opening direction of the side spray pipe 620.

[0061] It is worth mentioning that there are generally two ways of arranging the positions of the side spray nozzles 610 on both sides of the opening end of the side spray pipe 620 .

[0062] Method 1: The positions of the side spray nozzles 610 on both sides of the opening end of the side spray pipe 620 correspond one to one.

[0063] In a second method, the side spray nozzles 610 on both sides of the opening end of the side spray pipe 620 are staggered.

[0064] It is further pointed out that the water line sprayed from the side spray nozzle 610 is also arranged to diverge.

[0065] Preferably, an overflow port 210 is provided at the opening of the water storage tank 200 , and an overflow pipe 220 is connected to the overflow port 210 .

[0066] Further preferably, a filter screen 230 is provided at the opening of the water tank 200 , which can filter food residues, prevent food residues from entering the water tank 200 , and improve the water quality in the water tank 200 .

[0067] Preferably, a rinsing assembly 700 is further included, which is located on the other side of the upper spray assembly 400 or the lower spray assembly 500 and installed on the frame 100, wherein the rinsing assembly 700 includes a vertically arranged support pipe 710 and a rinsing pipe 720 connected to the support pipe 710 and arranged horizontally.

[0068] In this embodiment, by providing a rinsing component 700, the washed dishes can be rinsed again to improve the washing effect of the dishes. In addition, the water produced by rinsing is generally clean, which can not only replenish the water demand in the washing area, but also continuously update the water quality in the water tank 200, thereby improving the effect of washing the dishes.

[0069] It is worth mentioning that by setting up the rinsing component 700, in cooperation with the upper spray component 400, the lower spray component 500 and the side spray component 600, the entire washing area is completely covered, forming an all-round flushing of the entire washing area, thereby avoiding washing dead corners and improving the washing effect.

[0070] Preferably, it also includes two guide rails 110, which are respectively located on both sides of the washing channel, and the guide rails 110 are connected to the frame 100, wherein a column 120 is connected to each end of each guide rail 110, and a slot 121 is set on one end of each column 120 close to the upper spray assembly 400; and the press net is pressed, and each corner of the press net is snapped into the corresponding slot 121, so that the entire press net presents a downward convex structure.

[0071] It is worth mentioning that some of the tableware is light in weight and will be directly washed away from the washing channel under the impact of the water flow, affecting the washing effect of the tableware. In this embodiment, by setting a pressure net, a downward pressure can be applied to the light tableware, so that the tableware is always located in the washing channel, thereby improving the washing effect of the tableware.

[0072] Preferably, two movable door panels 130 are further included, which are respectively located on both sides of the washing channel, and the movable door panels 130 are detachably connected to the frame 100 .

[0073] In this embodiment, two movable door panels 130 are provided instead of one door panel because after the dishes are washed, the two movable door panels 130 can be removed at the same time, so that the entire washing area is open, thereby facilitating the rinsing of the entire washing area, avoiding food residues from remaining in a corner of the washing area and causing mildew, thereby ensuring the cleanliness and hygiene of the entire dishwasher.

[0074] Preferably, an air collecting box 140 is further provided on the frame 100, and the air collecting box 140 is located at the feeding end or the discharging end, wherein the air collecting box 140 is connected to the washing area.

[0075] In this embodiment, the water columns sprayed from the upper spray assembly 400, the lower spray assembly 500, the side spray assembly 600 and the rinsing assembly 700 generally have a certain temperature, so a large amount of water vapor will be generated in the washing area. When the water vapor accumulates to a certain volume, it will overflow from the various gaps in the washing area, thereby causing harm to the operators around it. By providing the air collecting box 140, on the one hand, the water vapor in the washing area can be guided out of the washing area to avoid the accumulation of water vapor. On the other hand, the guided water vapor can be guided to prevent the water vapor from rushing towards the operator, thereby ensuring the life safety of the operator.

[0076] Preferably, a control box 800 is further included, and the control box 800 is installed on the top of the rack 100 .

[0077] This arrangement, on the one hand, improves the utilization rate of the space above the dishwasher, and on the other hand, allows the control box 800 to be away from the water environment, thereby improving the electrical safety of the dishwasher.

[0078] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0079] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0080] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An intelligent automatic continuous dishwasher, characterized in that: include: A frame, and a washing channel is arranged on the frame, and the two ends of the washing channel are a feeding end and a discharging end respectively, wherein a washing area is arranged on the washing channel, and a water storage tank is arranged below the washing area; A water pump is installed on the frame, and one end of the water pump is connected to the bottom of the water tank through a water pump inlet pipe, and the other end of the water pump is connected to a water pump outlet pipe; An upper spray assembly and a lower spray assembly, and the upper spray assembly and the lower spray assembly are respectively located at the upper and lower sides of the washing channel, wherein the spray direction of the upper spray assembly is from top to bottom, and the spray direction of the lower spray assembly is from bottom to top, and the water inlet end of the upper spray assembly and the water inlet end of the lower spray assembly are both connected to the water outlet pipe of the water pump; The side spray assembly is located on one side of the upper spray assembly or the lower spray assembly, and the side spray assembly is connected to the water outlet pipe of the water pump, wherein two groups of side spray nozzles are arranged on the side spray assembly, and the two groups of side spray nozzles are arranged opposite to each other to form a counter-spraying; Among them, the water tank, water pump inlet pipe, water pump outlet pipe, upper spray assembly, lower spray assembly and side spray assembly together constitute the water circulation system of the dishwasher.

2. The intelligent automatic continuous dishwasher according to claim 1, characterized in that: The upper spray assembly includes an upper water guiding pipe connected to the water outlet pipe of the water pump, and the upper water guiding pipe is connected to a plurality of upper spray pipes arranged side by side, wherein a plurality of upper spray nozzles are arranged on the upper spray pipe along its length direction, and the spray direction of the upper spray nozzles is from top to bottom; the lower spray assembly includes a lower water guiding pipe connected to the water outlet pipe of the water pump, and the lower water guiding pipe is connected to a plurality of lower spray pipes arranged side by side, wherein a plurality of lower spray nozzles are arranged on the lower spray pipe along its length direction, and the spray direction of the lower spray nozzles is from bottom to top.

3. The intelligent automatic continuous dishwasher according to claim 2, characterized in that: The positions of the upper spray pipe and the lower spray pipe correspond one to one, and the positions of the upper spray nozzles on the upper spray pipe and the lower spray nozzles on the lower spray pipe correspond one to one; Or the positions of the upper spray pipe and the lower spray pipe correspond one to one, and the positions of the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are staggered; Or the upper spray pipe and the lower spray pipe are arranged in a staggered manner, when the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are projected onto the same horizontal plane, the adjacent upper spray nozzle and the lower spray nozzle are on the same horizontal line; Or the upper spray pipe and the lower spray pipe are staggered. When the upper spray nozzle on the upper spray pipe and the lower spray nozzle on the lower spray pipe are projected onto the same horizontal plane, the adjacent upper spray nozzle and lower spray nozzle are staggered.

4. The intelligent automatic continuous dishwasher according to claim 1, characterized in that: The side spray assembly includes a transition pipe connected to a water pump outlet pipe, and a side spray pipe connected to the transition pipe, wherein the side spray pipe is U-shaped, and the side spray nozzles are arranged on both sides of the opening direction of the side spray pipe, wherein the positions of the side spray nozzles on both sides of the opening end of the side spray pipe correspond one to one, or the positions of the side spray nozzles on both sides of the opening end of the side spray pipe are staggered.

5. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: It also includes a rinsing assembly, which is located on the other side of the upper spray assembly or the lower spray assembly and installed on the frame, wherein the rinsing assembly includes a vertically arranged support pipe and a rinsing pipe connected to the support pipe and arranged horizontally.

6. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: It also includes two guide rails, which are respectively located on both sides of the washing channel and connected to the frame, wherein a column is connected to each end of each guide rail, and a slot is set on one end of each column close to the upper spray assembly; a pressing net, and each corner of the pressing net is snapped on the corresponding slot, so that the entire pressing net presents a downward convex structure.

7. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: The utility model also comprises two movable door panels which are respectively located at two sides of the washing channel, and the movable door panels are detachably connected to the frame.

8. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: An air collecting box is also arranged on the frame, and the air collecting box is located at the feeding end or the discharging end, wherein the air collecting box is connected with the washing area.

9. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: The machine also comprises a control box, and the control box is installed on the top of the frame.

10. An intelligent automatic continuous dishwasher according to any one of claims 1 to 4, characterized in that: A filter screen plate is arranged at the opening of the water storage tank.

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