CN212292865U

CN212292865U - Filtering circulation water tank

Info

Publication number: CN212292865U
Application number: CN202020662839.2U
Authority: CN
Inventors: 李勇
Original assignee: Chongqing Jiebang Electric Co ltd
Current assignee: Chongqing Jiebang Electric Co ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2021-01-05
Anticipated expiration: 2030-04-27

Abstract

The utility model provides a filtering circulation water tank, which comprises a water inlet pipe, a water outlet pipe and a filtering system; the filtering system comprises a plurality of filtering tanks, the filtering tanks are provided with water inlets, water outlets and sewage outlets, and the sewage outlets are provided with sewage discharge valves. The first filtering tank is a closed container, the first filtering tank is a negative pressure tank, the rest filtering tanks are normal pressure tanks, a first valve is arranged at a water outlet of the first filtering tank, the first filtering tank is also provided with an air pumping hole, and the air pumping hole is connected with a negative pressure generating structure through an air pumping pipe. The utility model discloses a negative pressure generating structure takes the air in the first filtration jar out, and first valve is closed this moment, forms the negative pressure in the first filtration jar, and the effect of negative pressure is with sewage from the inlet tube inhale first filtration jar in. Compare set up the water pump on the inlet tube and go into first filtration jar with external sewage pump, the utility model discloses do not have the mechanical structure who closely cooperates on the inlet tube, lean on the negative pressure to inhale sewage, do not have the condition of blockking up the water pump, the reliability is higher.

Description

Filtering circulation water tank

Technical Field

The utility model belongs to the circulating water tank field, concretely relates to filtration circulating water tank.

Background

In industrial production, workpieces or products are usually cleaned by a cleaning machine, the cleaning machine is provided with a circulating water tank for ensuring the water quantity for the cleaning machine, sewage after cleaning the products enters the circulating water tank after treatment, or a sewage treatment system is designed to be part of the circulating water tank, the sewage directly enters the water tank for decontamination treatment, and clean water for cleaning is provided for the cleaning machine by the water tank.

CN201711055312.2 discloses a self-cleaning circulation water tank for a cleaning machine, which comprises a water return pipe (equivalent to the water inlet pipe of the water tank), a water supply pipe (equivalent to the water outlet pipe of the water tank), and a sewage treatment system; the sewage treatment system comprises a plurality of sedimentation-separation sewage treatment units which are connected in sequence, the sewage treatment units are provided with sedimentation-separation barrel-shaped containers, and the containers are provided with a water inlet, a sewage outlet and a water outlet; a plurality of settling zones which are vertically distributed and sequentially communicated are formed in the container.

A return water pump is generally connected to a return water pipe of an existing circulating water tank, sewage after cleaning products is pumped into a barrel-shaped container of the water tank through the return water pump, and when the barrel-shaped container is self-cleaned, the sewage is generally pumped out through a sewage discharge pump. Most of water pumps such as return water pump, dredge pump all use diaphragm pump or impeller type water pump, and the diaphragm pump has the high frequency to drag the inside diaphragmatic reciprocating motion of diaphragm pump for inside diaphragm appears breaking easily, and impeller type water pump's impeller twines rubbish easily, and impurity in the sewage can block up above-mentioned two kinds of water pumps, causes the unable normal work of water pump or damage even, water pump life greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem who exists among the prior art, the utility model aims at providing a filtration circulation water tank to solve among the prior art and go into the water tank through setting up the sewage pump behind the return water pump will wash the product, impurity can block up the problem of return water pump in the sewage.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a filtering circulation water tank comprises a water inlet pipe, a water outlet pipe and a filtering system; the filtering system comprises at least one filtering tank with a filtering structure, and the filtering tanks are provided with a water inlet and a water outlet;

when the number of the filter tanks is one, the filter tanks are negative pressure tanks; when the number of the filter tanks is two or more, at least one filter tank is a negative pressure tank, and the rest filter tanks are normal pressure tanks;

when the number of the filter tanks is two or more and the number of the negative pressure tanks is one, the two or more filter tanks are connected in series, and the water outlet of the previous filter tank is communicated with the water inlet of the next filter tank through a water delivery pipe;

the water outlet of the negative pressure tank is provided with a first valve for controlling the on-off of the negative pressure tank, or the first valve is arranged on a water delivery pipe for connecting the negative pressure tank and the normal pressure tank; the negative pressure tank is also provided with an air suction port, the air suction port is connected with a negative pressure generating structure, and an air inlet of the negative pressure generating structure is communicated with the air suction port of the negative pressure tank through an air suction pipe.

And closing the first valve, pumping out air in the negative pressure tank by the negative pressure generating structure to form negative pressure in the filter tank, and sucking sewage into the negative pressure tank from the water inlet pipe under the action of the negative pressure. Compared with the prior art, the water pump is arranged on the water inlet pipe, the sewage pump in the external cleaning equipment is pumped into the first filtering tank by the water pump, the water inlet pipe of the scheme is not provided with a mechanical structure which is tightly matched, the sewage is sucked by the negative pressure, the condition of blocking the water pump does not exist, and the reliability is higher.

In a preferred embodiment of the present invention, when the number of the filter tanks is two or more, the filter tanks are all vertically arranged;

the water outlet pipe is provided with a draining pump positioned in or outside the last filtering tank, and the draining pump can pump out the water filtered by the filtering structure of the last filtering tank;

the water pipe connecting the negative pressure tank and the normal pressure tank is provided with a water pump for pumping the water filtered in the negative pressure tank into the normal pressure tank behind the negative pressure tank.

In the technical scheme, the water filtered by the last filter tank is forcibly pumped out by arranging the drainage pump instead of relying on dead weight, so that the height of the position where the circulating filter water tank is arranged is not limited; the water after the first filtering tank is filtered is forcibly pumped out by arranging the water delivery pump, the pumped water quantity is basically equivalent to the entered water quantity, and in the filtering process, the negative pressure generation structure continuously works and the filtering efficiency is high.

In a preferred embodiment of the utility model, the water supply system is further included, the water supply system is communicated with the interior of the filter tank through a water supply pipe to supply water to the filter tank, and the water supply pipe is provided with a switch valve;

and/or each filter tank is also provided with a drain outlet, the drain outlet is provided with a drain valve, and the drain outlet and the water inlet of each filter tank are the same or two independent outlets.

In the technical scheme, the water replenishing system can be used for initially storing water in the filtering circulating water tank and replenishing water into the filtering tank when water evaporation is reduced; and when the filtering tank is cleaned (self-cleaning), water is added into the filtering tank by the water supplementing system without manual water addition. The sewage draining outlet and the sewage draining valve are arranged, and sewage drained by self-cleaning of the filter tank is drained from the sewage draining outlet, so that sewage draining is more convenient.

In a preferred embodiment of the present invention, the water charging system adds water into the atmospheric tank through a first water charging pipe, and the first water charging pipe is provided with a first switch valve; the water replenishing system is used for adding water into the negative pressure tank through a second water replenishing pipe, and a second switch valve is arranged on the second water replenishing pipe;

a first water level meter capable of detecting a first water level and a second water level meter capable of detecting a second water level are arranged in the last filter tank, the second water level is higher than the first water level, and a water inlet of the drainage pump is lower than or positioned at the first water level;

the first filtering tank is internally provided with a third water level instrument capable of detecting a third water level and a fourth water level instrument capable of detecting a fourth water level, the fourth water level is higher than the third water level, and a water inlet of the water delivery pump is lower than or positioned at the third water level.

When water is added into the filtering circulating water tank to store water initially, the first water level is the maintaining water level (namely the lowest water level) of the normal pressure tank, the drainage pump stops working when the first water level is lower than the first water level, and the second water level is the rated water level. The third water level is the maintaining water level (namely the lowest water level) of the negative pressure tank, the water delivery pump stops working when the third water level is lower than the third water level, meanwhile, the water supplementing system supplements water to the first filtering tank, and the fourth water level is the rated water level. When the filtering circulation water tank works stably, a plurality of filtering tanks in the water tank are communicated through pipelines, a certain water level can be kept according to the principle of a communicating vessel, and a water delivery pump and a drainage pump work all the time.

In a preferred embodiment of the present invention, the water replenishing system adds water to the last filtration tank through a third water replenishing pipe, and a third on/off valve is provided on the third water replenishing pipe; the water replenishing system adds water into the residual filter tank through a fourth water replenishing pipe, and a fourth switch valve is arranged on the fourth water replenishing pipe;

the third switch valve is a normally open valve, a floating ball switch positioned in the last filtering tank is also arranged on the third water supplementing pipe, the floating ball switch is opened when the water level of the last filtering tank is lower than the sixth water level, and the floating ball switch is closed when the sixth water level is reached;

the water inlet of the drainage pump is lower than the sixth water level, and the water inlet of the water delivery pump is lower than the sixth water level.

In the technical scheme, the third switch valve is a normally open valve, in the filtering process, when the water level in the last filtering tank is lower than the sixth water level, the floating ball switch is opened, the water replenishing system replenishes water into the last filtering tank through the third water replenishing pipe, and when the water level reaches the sixth water level, the floating ball switch acts to close the water outlet of the third water replenishing pipe. After stable work, the water quantity pumped by the water delivery pump is basically equal to the water quantity sucked into the first filter tank, so that water can not be supplemented into the first filter tank in the filtering process, and only the normal pressure tank is supplemented with water.

In another preferred embodiment of the present invention, the filtering structure comprises a central shaft fixedly arranged, a plurality of first filtering sheets are arranged on the outer wall of the central shaft, a gap is formed between the outer edge of the first filtering sheet and the inner wall of the filtering tank, a plurality of second filtering sheets staggered with the first filtering sheets are arranged on the inner wall of the filtering tank, and a gap is also formed between the outer edge of the second filtering sheet and the central shaft;

the water inlets of all the filtering tanks are arranged at the bottom, and the water outlets are positioned in the middle or the middle upper part of the filtering tanks.

The water entering the filtering tank floats upwards from the bottom, and the first filtering sheet and the second filtering sheet block the sewage to filter the sewage.

In another preferred embodiment of the present invention, the filtering structure comprises a hollow central shaft which is fixedly arranged, the outer wall of the central shaft is provided with a plurality of first filtering sheets, a gap is formed between the outer edge of each first filtering sheet and the inner wall of the filtering tank, the inner wall of the filtering tank is provided with a plurality of second filtering sheets which are staggered with the first filtering sheets, and a gap is also formed between the outer edge of each second filtering sheet and the central shaft;

the lower end of a central shaft in the normal pressure tank is fixedly connected with the bottom of the filter tank, a water outlet of the normal pressure tank is communicated with a lower port of the central shaft, and a water inlet is positioned outside the central shaft at the bottom of the filter tank;

a gap is formed between the lower end of a central shaft in the negative pressure tank and the bottom of the filter tank, a water inlet of the negative pressure tank is positioned at the upper port of the central shaft, and a water outlet is not lower than the uppermost filter sheet; or the lower end of a central shaft in the negative pressure tank is fixedly connected with the bottom of the filtering tank, the water outlet of the negative pressure tank is communicated with the lower port of the central shaft, and the water inlet is positioned outside the central shaft at the bottom of the filtering tank.

Among the above-mentioned technical scheme, the water that gets into in the ordinary pressure jar floats from the bottom, is blocked filth by first cassette and second cassette, carries out the filtering work of sewage, and inside getting into the center pin from center pin upper end mouth again after filtering, the delivery port of back from filtering the tank bottoms portion discharges, and water inlet and delivery port all establish the bottom of filtering the jar for the structure is compacter.

In another preferred embodiment of the present invention, the drain outlet of each filter tank is commonly connected to a main drain pipe, a main drain valve is disposed on the main drain pipe, the end of the main drain pipe is connected to a sewage buffer tank, the sewage buffer tank has a sewage inlet and a sewage outlet, and the air outlet of the negative pressure generating structure is communicated with the sewage inlet through a sewage delivery pipe;

and/or the air outlet of the negative pressure generating structure is connected with an air explosion air conveying pipe, the air explosion air conveying pipe is connected with an air explosion main valve, the outlet of the air explosion air conveying pipe is connected with a plurality of air explosion branch pipes in parallel, and the air explosion branch pipes are inserted into the filter tank from top to bottom;

when the blowdown gas pipe and the air explosion gas pipe are arranged at the same time, the blowdown gas pipe is provided with an air outlet switch valve.

In the technical scheme, the sewage after the filtering tank is self-cleaned enters the sewage cache tank, and then the compressed air is pressurized to forcibly discharge the sewage in the sewage cache tank. When the filtering tank is self-cleaned, compressed air is introduced into water in the filtering tank to play roles of stirring and impacting, so that self-cleaning is facilitated, and the self-cleaning effect is better.

In another preferred embodiment of the present invention, the blowoff valve includes a valve seat arranged in a hollow manner and a buoyancy valve core located inside the valve seat, a limiting block is fixedly arranged below the buoyancy valve core, the top of the valve seat is provided with an inlet, and the bottom of the valve seat is provided with an outlet;

in the filtering process, the buoyancy valve core can seal the inlet of the valve seat to close the drain valve;

in the sewage discharging process, the buoyancy valve core is limited by the limiting block to open the sewage discharging valve.

Because the utility model is provided with the main sewage drain pipe and the main sewage drain valve, the main sewage drain valve is closed in the filtering process, so that the sewage drain valve can be automatically closed; when in pollution discharge, the main pollution discharge valve is opened, so that the pollution discharge valve can be automatically opened without manual work or electric devices for controlling the action of the pollution discharge valve.

The utility model discloses an among another kind of preferred embodiment, on the inlet tube or the water inlet department of negative pressure jar still is equipped with the non return structure, and the non return structure adopts one of following structure:

the structure I is that a second valve for controlling the on-off of the water inlet pipe is arranged on the water inlet pipe, or the second valve is arranged at the water inlet of the negative pressure tank;

the structure II is that an upward bent bending section is arranged on the water inlet pipe, and the top of the bending section is higher than the highest water level of water in the first filter tank;

the structure three, be equipped with the aqueous vapor knockout drum on the inlet tube, the aqueous vapor knockout drum have with advance water piping connection's water inlet and delivery port, this water inlet is higher than the highest water level of first filtration jar normal water, the top of aqueous vapor knockout drum still has the gas outlet, the gas outlet passes through breather pipe and first jar of internal portion intercommunication.

After the non-return structure is arranged, due to the one-way circulation effect of the non-return structure, when water needs to be stored in the filter tank, the non-return structure can prevent the water in the filter tank from flowing out in a reverse flow manner from the water inlet pipe; during filtering, sewage can enter the first filtering tank from the water inlet pipe.

The beneficial effects of the above technical scheme are: additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a filtration cycle water tank according to a first embodiment of the present application.

Fig. 2 is another schematic structural diagram of the filtration cycle water tank according to the first embodiment of the present application.

Fig. 3 is a schematic view of the structure of the first valve and the second valve in the present application.

Fig. 4 is a schematic structural diagram of a filter structure in the first embodiment of the present application.

Fig. 5 is a schematic structural view of a filtration cycle water tank according to the second embodiment of the present application.

Fig. 6 is a schematic structural view of a filtration cycle water tank according to a third embodiment of the present application.

Fig. 7 is a schematic structural view of a filtration cycle water tank according to a fourth embodiment of the present application.

Fig. 8 is a schematic structural view of a filtration cycle water tank according to a fifth embodiment of the present application.

Fig. 9 is a schematic structural view of a filtration cycle water tank according to a sixth embodiment of the present application.

Fig. 10 is a schematic structural view of a filtration cycle water tank according to a seventh embodiment of the present application.

Reference numerals in the drawings of the specification include: the filter tank 10, the negative pressure tank 10a, the normal pressure tank 10b, the filter tank water inlet 101, the filter tank water outlet 102, the filter tank sewage outlet 103, the filter structure 11, the central shaft 111, the first filter sheet 112, the second filter sheet 113, the water inlet hopper 114, the water pipe 12, the water pump 121, the first valve 122, the one-way valve seat 1221, the abdicating cavity 1222, the ball valve core 1223, the water branch pipe 13, the fifth valve 131, the water inlet pipe 20, the second valve 21, the bending section 22, the water-gas separation tank 23, the air outlet 231, the vent pipe 24, the water inlet branch pipe 25, the third valve 251, the water outlet pipe 30, the drain pump 31, the anti-siphon port 32, the first water outlet switch valve 33, the second water outlet switch valve 34, the negative pressure generating structure 40, the air exhaust pipe 41, the air exhaust valve 411, the air inlet branch pipe 412, the air inlet valve 413, the sewage discharge air pipe 42, the air outlet switch valve 421, the air explosion air pipe 43, the sewage treatment system comprises an air suction branch pipe 44, a fourth valve 441, a sewage main pipe 50, a sewage valve 51, a valve seat 511, a buoyancy valve core 512, a limiting block 513, a sewage main valve 52, a sewage cache tank 53, a sewage inlet 531, a sewage outlet 532, a water supplementing system 60, a first water supplementing pipe 61, a first switch valve 611, a second water supplementing pipe 62, a second switch valve 621, a third water supplementing pipe 63, a third switch valve 631, a floating ball switch 632, a fourth water supplementing pipe 64, a fourth switch valve 641, a first water level meter 71, a second water level meter 72, a third water level meter 73, a fourth water level meter 74, a fifth water level meter 75, a sixth water level meter 76, a seventh water level meter 77 and a sixth water level L.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

Example one

The present embodiment provides a filtering circulation water tank, as shown in fig. 1, in a preferred embodiment of the present invention, the filtering circulation water tank comprises a water inlet pipe 20, a water outlet pipe 30 and a filtering system, the filtering system comprises at least one filtering tank 10 having a filtering structure 11, and the filtering tank 10 has a water inlet 101 and a water outlet 102.

The filtration tank 10 includes at least one negative pressure tank 10a, and the present embodiment is described with one negative pressure tank 10a being provided.

When the number of the filter tanks 10 is one, the filter tanks are negative pressure tanks 10a which are closed containers, the water inlet pipe 20 is connected with the water inlet of the filter tank 10, and the water outlet pipe 30 is connected with the water outlet of the filter tank 10.

When the number of the filter tanks 10 is two or more, the first filter tank connected to the water inlet pipe 20 is the negative pressure tank 10a, and the other filter tanks are the normal pressure tanks 10 b. Two or more filter tanks 10 are connected in series, a water inlet pipe 20 is connected with the water inlet of the first filter tank 10, a water outlet pipe 30 is connected with the water outlet of the last filter tank 10, and the water outlet of the previous filter tank 10 is connected with the water inlet of the next filter tank 10 through a water conveying pipe 12. Preferably, the number of the filter tanks 10 is two or more, and the filter tanks 10 are all vertically arranged and can be arranged side by side along the length direction as shown in fig. 1 or distributed circumferentially.

In this embodiment, one filtering tank 10 is set as one-stage filtering, two filtering tanks 10 are set as two-stage filtering, and three or more filtering tanks 10 are set as multi-stage filtering, so that in practice, filtering can be performed according to conditions, and the water discharged from the water outlet pipe 30 can meet the use requirement.

As shown in fig. 1, the present embodiment is described by taking four filter tanks 10 as an example, and includes a first filter tank, a second filter tank, a third filter tank, and a fourth filter tank (i.e., the last filter tank) from left to right, the first filter tank is a negative pressure tank 10a, and the second to fourth filter tanks are normal pressure tanks 10 b.

The water outlet of the first filter tank 10 is provided with a first valve 122 for controlling the on-off of the first valve, or the first valve 122 is provided on the water pipe 12 connecting the first filter tank 10 and the second filter tank 10, in this embodiment, the first valve 122 is an electromagnetic valve or a manual valve. The first filter tank 10 further has an air exhaust opening, for example, the air exhaust opening is located at the top of the filter tank 10, the air exhaust opening is connected with a negative pressure generating structure 40, an air inlet of the negative pressure generating structure 40 is communicated with the air exhaust opening through an air exhaust pipe 41, in this embodiment, the negative pressure generating structure 40 may be a negative pressure fan or a vacuum pump.

As shown in fig. 1, in the present embodiment, the water inlets of the four filter tanks 10 are all arranged at the bottom, the water outlets are arranged at the middle or middle upper portion, preferably, the water outlets of the filter tanks 10 are not lower than the top of the filter structure 11, preferably, the water outlets of the four filter tanks are located above the filter structure 11, optionally, the water outlets of the four filter tanks are at the same height, and the first valve 122 is arranged on the water conveying pipe 12 connecting the first filter tank 10 and the second filter tank 10.

Before the circulation water tank is used, a water inlet port of the water inlet pipe 20 is connected with a sewage outlet of an external cleaning device (such as a sole cleaning machine), and a water outlet port of the water outlet pipe 30 is connected with a clean water inlet of the cleaning device. When the water in the external cleaning equipment is enough (water is not required to be added into the four filter tanks 10 in advance), the cleaning equipment is started, the filter circulation water tank is started, the first valve 122 is closed when the filter circulation water tank works initially, the negative pressure generating structure 40 pumps out the air in the first filter tank 10, so that negative pressure is formed in the first filter tank, the external sewage is sucked into the first filter tank 10 from the water inlet pipe 20 under the action of the negative pressure, and the external sewage is filtered by the filter structure 11 in the first filter tank 10.

The more water is sucked into the first filtering tank 10, the water level rises, when the water level of the first filtering tank 10 is higher than the water outlet, the negative pressure generating structure 40 is closed, the first valve 122 is opened, the water filtered by the first filtering tank 10 sequentially enters the second filtering tank, the third filtering tank and the fourth filtering tank for filtering, clean water is discharged from the water outlet pipe 30 after four-stage filtering, and the filtered clean water is supplied to the cleaning equipment for use. The water level of the first filter tank 10 is lowered by the discharged water, and after the water level of the first filter tank 10 is lower than the water outlet, the first valve 122 is closed, the negative pressure generating structure 40 is opened, and the external sewage is sucked into the first filter tank.

In this embodiment, the negative pressure generating structure 40 may be made to operate periodically by setting time, for example, one period is 10S for operation and 10S for stop, and specifically, the start and stop of the negative pressure generating structure 40 may be manually controlled or automatically controlled, during automatic control, the negative pressure generating structure 40 is further electrically connected to a time controller, for example, a DH48S-S type time controller of shanghai catalpi limited electronics, a power source end of the time controller is connected to a power source, and an output end of the time controller is connected to an enable end of the negative pressure generating structure 40, so that the negative pressure generating structure 40 operates periodically. Or a water level meter is arranged at the outlet of the first filter tank to control the start and stop of the pressure generating structure 40, such as a control system disclosed in CN201710208249.5 for controlling the start and stop of the submersible pump according to the liquid level.

After the filtering circulation water tank operates stably, the flow of the sewage entering the first filtering tank 10 from the water inlet pipe 20 is equal to the flow of the clean water discharged from the fourth filtering tank 10, so that the water in the cleaning equipment and the filtering circulation water tank can circulate.

The utility model discloses a negative pressure takes place structure 40 and takes out the air in filtering jar 10 for the first, produces the negative pressure to make external sewage get into first filtering jar 10 from inlet tube 20, need not to establish the water pump on inlet tube 20 and carry sewage to first filtering jar 10 in.

In another preferred embodiment, as shown in fig. 2, the water outlet pipe 30 is provided with a drain pump 31 located in or outside the fourth filter tank 10, and the drain pump 31 can pump out the water filtered by the filter structure 11 of the last filter tank 10. For example, the drain pump 31 is a submersible pump disposed in the fourth filter tank 10, a water outlet of the drain pump 31 is connected to the water outlet pipe 30, and preferably, a water inlet port of the drain pump 31 is higher than the top of the filter structure 11, so that the drain pump 31 is immersed in water after stable operation. The filtered clean water is delivered to the equipment needing water by the drainage pump 31, and when the equipment does not use water, the water discharged from the water outlet pipe 30 can be delivered to the first filter tank 10 for filtering again. Optionally, the water outlet pipe 30 is further provided with a first water outlet switch valve 33, and the first water outlet switch valve 33 is a manual valve or an electric valve.

The first filtering tank 10 is provided with a water conveying pump 121 for pumping the water filtered in the first filtering tank 10 into the subsequent filtering tank 10, and the water conveying pump 121 can pump the water filtered by the filtering structure 11 of the first filtering tank 10 into the second filtering tank 10. For example, the water delivery pump 121 is a submersible pump disposed in the first filter tank 10, a water outlet of the water delivery pump 121 is connected to the water delivery pipe 12, and the first valve 122 is disposed on the water delivery pipe 12 and located downstream of the water delivery pump 12. In this embodiment, it is preferable that the first valve 122 is a check valve, and the water pump 121 generates a positive pressure to open the first valve 122 located therebehind, thereby transferring the water filtered by the first canister 10 to the second canister 10. After stable operation, the water pump 121 is always immersed in water, so that a negative pressure can still be generated in the first canister 10 when the first valve 122 is opened. Most of the sewage in the water delivered by the water delivery pump 121 is filtered by the first filtering tank, so that the water delivery pump 121 is not easily blocked by the sewage, and the service life is long.

As shown in fig. 3, in the present embodiment, the first valve 122 includes a one-way valve seat 1221 disposed in a hollow manner and a ball valve element 1223 located in the one-way valve seat 1221, the left and right ends of the one-way valve seat 1221 are respectively a water inlet and a water outlet, and the diameter of the ball valve element 1223 is greater than the diameter of the water inlet and the water outlet of the one-way valve seat 1221; the middle part of the one-way valve seat 1221 is provided with an outwardly protruding abdicating cavity 1222 capable of accommodating the ball valve core 1223, and the abdicating cavity 1222 is preferably arranged in a backward inclining mode. Alternatively, the first valve 122 may be a one-way valve of other construction known in the art.

When the sewage in the external cleaning equipment is not enough and the water in the whole filtration circulating water tank can not be circulated, water needs to be added into the four filtration tanks 10 firstly, and the filtration circulating water tank can only carry out filtration work when the water is stored to the water amount in stable operation. In the process of storing water in the four filter tanks 10, in order to prevent water from flowing back from the water inlet pipe 20, a check structure is further disposed on the water inlet pipe 20 or at the water inlet of the negative pressure tank 10a, as shown in fig. 2, in this embodiment, the check structure is a second valve 21 disposed on the water inlet pipe 20 to control the on-off of the second valve, or the second valve 21 is disposed at the water inlet of the first filter tank 10a, the second valve 21 is an electromagnetic valve, a manual valve or a one-way valve, and the structure of the second valve may be the same as that of the first valve 122, which is not described herein again. When the second valve 21 is a one-way valve and the negative pressure generating structure 40 works to draw out air in the first filter tank 10, the first valve 21 is opened by suction force, and external sewage enters the first filter tank.

In another preferred embodiment, as shown in fig. 4, the filtering structure 11 includes a central shaft 111 fixedly disposed, the central shaft 111 can be fixedly connected to the inner wall of the filtering tank 10 by a bracket, a plurality of first filtering sheets 112 obliquely tilted are disposed on the central shaft 111 along the length direction (vertical direction), and a gap is formed between the outer edge of the first filtering sheet 112 and the inner wall of the filtering tank 10 to facilitate water to flow through. A plurality of second filter sheets 113 which are arranged in a staggered way with the first filter sheets 112 and incline downwards are arranged on the inner wall of the filter tank 10, and a gap is also arranged between the outer edge of the second filter sheet 113 and the central shaft 111, so that water can flow through the gap conveniently. The water inlets 101 of all the filter tanks 10 are arranged at the bottom, the water outlets 102 are arranged at the middle part of the side wall of the filter tank 10, and the water outlets 102 are preferably not lower than the top of the filter structure 11 (i.e. not lower than the top of the uppermost filter sheet).

In the present embodiment, the first filter 112 and the second filter 113 are in the shape of lotus leaves, and the upper surfaces thereof are provided with guide grooves, similar to ribs of lotus leaves, for guiding the flow; the first filter sheet 112 and the second filter sheet 113 are formed by splicing a plurality of arc-shaped sheets or are a whole circle of conical sheets. The water entering the filter tank 10 flows from bottom to top, and the dirt in the sewage is blocked by the filter sheet.

In another preferred embodiment, the filtration cycle water tank further comprises a water replenishing system 60, the water replenishing system 60 is communicated with the interior of the filtration tank 10 through a water replenishing pipe for replenishing water to the filtration tank 10, the water replenishing pipe is provided with a switch valve, and an inlet of the water replenishing system 60 is connected with an external faucet.

In the present embodiment, as shown in fig. 2, the water replenishing system 60 is configured to replenish water into the normal pressure tank 10b through a first water replenishing pipe 61, for example, the first water replenishing pipe 61 is divided into three paths to replenish water into the second filtering tank 10, the third filtering tank 10 and the fourth filtering tank 10, and a first on-off valve 611 is provided on a main pipe of the first water replenishing pipe 61. The water replenishing system 60 is configured to add water to the negative pressure tank 10a (the first canister 10) through a second water replenishing pipe 62, and a second switch valve 621 is provided on the second water replenishing pipe 62. In the present embodiment, the first switching valve 611 and the second switching valve 621 are both normally closed electric ball valves.

Preferably, the fourth filter tank 10 is provided with a first water level meter 71 capable of detecting a first water level and a second water level meter 72 capable of detecting a second water level, the second water level is higher than the first water level, and the water inlet of the drain pump 31 is lower than or at the first water level, for example, the drain pump 31 is a submersible pump, and the whole submersible pump is located below the first water level. The first filtering tank 10 is provided with a third water level meter 73 capable of detecting a third water level and a fourth water level meter 74 capable of detecting a fourth water level, the fourth water level is higher than the third water level, and the water inlet of the water delivery pump 121 is lower than or at the third water level, for example, the water delivery pump 121 is also a submersible pump, the water inlet of the submersible pump is at the first water level, and the whole water delivery pump 121 is at the fourth water level.

When the water needs to be stored in the four filter tanks 10 in advance to reach the water amount of stable operation, water can be added into the four filter tanks 10 through the water supplementing system 60, and the operation is more convenient. With the four filter tanks 10 as empty tanks (after self-cleaning, water is drained) as a starting point, the first switch valve 611 is opened to add water to the fourth filter tank 10 to the second water level, the first switch valve 611 is closed (according to the principle of communicating vessels, the water levels in the three atmospheric tanks 10b are kept the same during filtering), the second switch valve 621 is opened to add water to the first filter tank 10 to the fourth water level, and the first switch valve 611 is closed.

After the water is stored to the stable operation water amount, in the initial operation, for example, when there is no water in the external washing device requiring water, the water discharge pump 31 is firstly started to supply water to the washing device, when the water level in the fourth filtering tank 10 is reduced to the first water level, the water delivery pump 121 is then started until the water level of the fourth filtering tank 10 reaches the second water level, if the water delivery pump 121 is operated for more than XX seconds (the specific time is set according to the actual pipeline length), the water level of the fourth filtering tank 10 is not yet reduced to the second water level, it is indicated that the water level of the first filtering tank 10 is reduced to the third water level, at this time, the second switch valve 621 is opened to replenish water to the first filtering tank 10 to the fourth water level, and then the water delivery pump 121 and the negative pressure generating structure 40 are opened, and the filtration circulation water tank.

In the process of the operation of the filtering circulation water tank, when water is reduced due to evaporation, water can be supplemented into the four filtering tanks 10 through the water supplementing system 60. When the water level in the fourth filtering tank 10 is lowered to the first water level, the first switching valve 611 is opened to replenish water to the fourth filtering tank 10 to a second water level; when the water level in the first canister 10 is lowered to the third water level, the second switching valve 621 is opened to replenish the water to the first canister 10 to the fourth water level.

When the filtering circulation water tank is operated, the water entering from the water inlet pipe 20 is substantially equal to the water discharged from the water outlet pipe 30, and the flow rate of the water discharge pump 31 is equal to that of the water supply pump 121, so that the water in the first filtering tank 10 does not reach the top of the first filtering tank 10 and is not discharged from the air suction hole pipe 41. However, in order to further improve the reliability, as shown in fig. 2, a fifth level gauge 75 may be provided at a fifth water level of the upper portion of the first canister 10, and when the water level of the first canister 10 reaches the fifth water level, the negative pressure generating structure 40 is closed until the water in the first canister 10 drops to a fourth water level.

In the present embodiment, the water level meter may be any water level meter (a water level sensor may also be used), such as a water level probe used in a washing machine, and the specific switch valves may be controlled manually or automatically, for example, when the water level reaches the second water level, the second water level meter 72 outputs a trigger signal; when the water level reaches the fourth water level, the fourth water level meter 74 outputs a trigger signal; when the water level is lower than the first water level, the first water level meter 71 outputs a trigger signal; when the water level is lower than the third water level detecting instrument, the third water level instrument 73 outputs a trigger signal.

Specifically, the output end of each water level meter may be connected to a comparator, a first input end of the comparator is connected to the output end of the corresponding water level meter, and a second input end of the comparator is connected to the corresponding threshold memory. For example, the output terminal of the second water level meter 72 is connected to the first input terminal of the second comparator, the second input terminal of the second comparator is connected to the second threshold memory, and when the water level detected by the second water level meter 72 is higher than the second threshold (second water level), the second comparator outputs the second trigger signal. The output terminal of the fourth water level meter 74 is connected to the first input terminal of the fourth comparator, the second input terminal of the fourth comparator is connected to the fourth threshold memory, and when the water level detected by the fourth water level meter 74 is higher than the fourth threshold (fourth water level), the fourth comparator outputs a fourth trigger signal. The output end of the third water level meter 73 is connected with the first input end of a third comparator, the second input end of the third comparator is connected with a third threshold value memory, and when the water level detected by the third water level meter 73 is higher than a third threshold value (third water level), a signal output by the third comparator passes through a not gate, and the not gate outputs a trigger signal. The output end of the first water level meter 71 is connected with the first input end of the first comparator, the second input end of the first comparator is connected with the first threshold value memory, when the water level detected by the first water level meter 71 is higher than the first threshold value (first water level), the signal output by the first comparator passes through the not gate, and the not gate outputs the first trigger signal.

The first trigger signal is connected to the open control end of the first switch valve 611, and the second trigger signal is connected to the close control end of the first switch valve 611. The third trigger signal is connected to the open control end of the second switch valve 621, and the fourth trigger signal is connected to the close control end of the second switch valve 621.

The first trigger signal is connected to a stop control terminal of the drain pump 31, and the second trigger signal is connected to a start control terminal of the drain pump 31. The third trigger signal is connected with the stop control end of the water delivery pump 121, and the second trigger signal is connected with the start control end of the water delivery pump 121.

A fifth water level meter 75 is arranged at a fifth water level of the first filter tank, an output end of the fifth water level meter 75 is connected with a first input end of a fifth comparator, a second input end of the fifth comparator is connected with a fifth threshold value storage, and when the water level detected by the fifth water level meter 75 is higher than a fifth threshold value (fifth water level), the fifth comparator outputs a fifth trigger signal. The fourth trigger signal is connected with the starting control end of the negative pressure generating structure 40 through the NOT gate, the fifth trigger signal is connected with the stopping control end of the negative pressure generating structure 40, when the water level exceeds the fourth water level, the negative pressure generating structure 40 is opened, when the water level reaches the fifth water level, the negative pressure generating structure 40 is closed, and the filtering circulating water tank works stably.

As shown in fig. 2 and 4, in another preferred embodiment, each filter tank 10 further has a sewage draining outlet 103, a sewage draining valve 51 is disposed at the sewage draining outlet 103, the sewage draining outlet 103 and the water inlet 101 are the same or two independent ports, in this embodiment, the sewage draining outlet 103 and the water inlet 101 are one port disposed at the bottom of the filter tank 10, the ports are respectively connected with the water inlet pipe 20 and the sewage draining valve 51, and the water inlet pipe 20 and the sewage draining valve 51 are connected in parallel.

When the filtering circulation water tank filters sewage, the blowoff valve 51 is closed, and after the circulation water tank works for a period of time, when the dirt on the filtering structure 11 is more, the circulation water tank needs to be self-cleaned. Before self-cleaning, the drainage pump 31, the water delivery pump 121 and the negative pressure generating structure 40 are closed, the drainage valve 51 is opened, the water supplementing system 60 adds water into the four filter tanks 10 for flushing, and the flushed sewage is discharged from the sewage discharge port of the filter tanks 10.

As shown in fig. 4, in another preferred embodiment, the sewage outlets of the four filter tanks 10 are commonly connected to a sewage main pipe 50, the outlet of a sewage valve 51 is connected to the sewage main pipe 50, the sewage main pipe 50 is provided with a sewage main valve 52, the end of the sewage main pipe 50 is connected to a sewage buffer tank 53, the sewage buffer tank 53 has a sewage inlet 531 and a sewage outlet 532, and the air outlet of the negative pressure generating structure 40 is communicated with the sewage inlet 531 through a sewage conveying pipe 42.

In this embodiment, the water in the cleaning apparatus is drained before self-cleaning. During sewage disposal, sewage discharged when the four filter tanks 10 are self-cleaned is conveyed into the sewage cache tank 53 through the sewage main pipe 50, then the sewage main valve 52 is closed, the negative pressure generating structure 40 is started, and compressed air generated by the air outlet of the negative pressure generating structure 40 enables the sewage to be forcibly discharged from the sewage outlet 532 in the sewage cache tank 53. When the filtering circulation water tank filters the sewage, the air in the first filtering tank 10 pumped by the negative pressure generating structure 40 is also discharged from the sewage outlet 532 in the sewage buffer tank 53.

In the present embodiment, the blowoff valve 51 may be a manual valve, an electric valve, or a float valve. When the blowoff valve 51 is a float valve, as shown in fig. 4, the blowoff valve 51 includes a valve seat 511 disposed in a hollow manner and a buoyancy valve core 512 disposed inside the valve seat 511, the top of the valve seat 511 has an inlet, the bottom of the valve seat 511 has an outlet, a stopper 513 is fixedly disposed below the buoyancy valve core 512, and the stopper 513 is not in contact with the outlet of the valve seat 511. During the filtering process, the buoyancy valve core 512 can seal the inlet of the valve seat 511 to close the blowdown valve 51; in the sewage discharging process, the buoyancy valve core 512 is limited by the limiting block 513 to open the sewage discharging valve 51.

When the blowdown valve 51 is used, the blowdown main valve 52 is closed during filtering, the buoyancy valve core 512 floats upwards to seal the inlet of the valve seat 511, and the blowdown valve 51 is closed; during sewage discharge, the main sewage discharge valve 52 is opened, sewage after self-cleaning flows downwards from the bottom of the filter tank 10, the buoyancy valve core 512 moves downwards due to the impact force of water, and due to the action of the limiting block 513, the buoyancy valve core 512 cannot move downwards continuously, so that the buoyancy valve core 512 is in the middle position, and the sewage discharge valve 51 is opened.

As shown in fig. 2, in another preferred embodiment, the air outlet of the negative pressure generating structure 40 is connected to an air explosion air pipe 43, the air explosion air pipe 43 is connected to an air explosion main valve 431, the blowdown air pipe 42 is provided with an air outlet switch valve 421, the outlet of the air explosion air pipe 43 is connected in parallel to a plurality of air explosion branch pipes 432, and the air explosion branch pipes 432 are inserted into the filter tank 10 from top to bottom.

During self-cleaning, the blowdown main valve 52 and the air outlet switch valve 421 are closed, the water supplementing system 60 adds water into the four filter tanks 10 to submerge the filter structures 11, then the negative pressure generating structure 40 is started, the air explosion main valve 431 is opened, compressed air discharged by the negative pressure generating structure 40 enters water in the filter tanks 10 through the air explosion branch pipe 432, the compressed air has stirring and impact effects in the filter tanks 10, dirt on the first filter sheet 112 and the second filter sheet 113 is separated and suspended in the water, then the blowdown main valve 52 is opened, the blowdown valve 51 is automatically opened, and the dirt is discharged to the sewage cache tank 53 along with the water. After compressed air is introduced into the water in the filter tank 10, the self-cleaning effect is better.

In another preferred embodiment, the blowdown main valve 52, the gas explosion main valve 431 and the gas outlet switch valve 421 are all electric ball valves, the blowdown main valve 52 and the gas explosion main valve 431 are normally closed electric ball valves, and the gas outlet switch valve 421 is a normally open electric ball valve.

It should be noted that the air outlet 231 of the negative pressure generating structure 40 may be connected to only the blowdown air pipe 42 or the air explosion air pipe 43, and the blowdown air pipe 42 may not be provided with the air outlet switch valve 421.

In another preferred embodiment, as shown in fig. 2, the sewage buffer tank 53 is inclined to facilitate the drainage of sewage and contaminants, and a seventh level meter 77 is provided at a seventh level in the sewage buffer tank 53. When the sewage is discharged after self-cleaning, the negative pressure generating structure 40 is not opened, and the sewage is automatically discharged by gravity; when the water level in the sewage buffer tank 53 reaches the seventh water level, it indicates that the sewage cannot be discharged by gravity or is discharged slowly, and at this time, the negative pressure generating structure 40 is opened again to perform forced sewage discharge, so as to save energy consumption.

Example two

The structure principle of this embodiment is substantially the same as that of the first embodiment except that the check structure is different, and in this embodiment, as shown in fig. 5, the check structure includes an upwardly bent segment 22 provided on the water inlet pipe 20, and the top of the bent segment 22 is higher than the highest water level of the water in the first canister 10. By adopting the structure of the bending section 22, when water is initially stored in the four filter tanks 10, the water in the filter tanks 10 cannot flow back from the water inlet pipe 20, and the non-return function is realized.

EXAMPLE III

The structure principle of this embodiment is basically the same as that of the first and second embodiments, except that the check structure is different, in this embodiment, as shown in fig. 6, the check structure includes a water-gas separation tank 23 disposed on the water inlet pipe 20, the water-gas separation tank 23 has a water inlet and a water outlet capable of being connected to the water inlet pipe 20, and the water inlet is higher than the highest water level of water in the first filtration tank 10; the top of the water-gas separation tank 23 is also provided with an air outlet 231, and the air outlet 231 is communicated with the interior of the first filter tank 10 through a vent pipe 24. When water is initially stored in the four filter tanks 10, the water in the filter tanks 10 cannot flow back from the water inlet pipe 20, and the check function is achieved.

Because the sewage discharged by part of the sole cleaning machine contains air which is a water-gas mixture, when the water-gas mixture enters the first filtering tank 10, the air has a stirring effect on the water in the first filtering tank 10, and the filtering is not facilitated. After the water-gas separation tank 23 is arranged, the water-gas mixture enters the water-gas separation tank 23, and water is conveyed downwards by the self weight and enters from the bottom of the first filter tank 10; air is discharged from the air outlet 231 at the top of the water-gas separation tank 23 to the first filter tank 10, and the air outlet 231 of the water-gas separation tank 23 is communicated with the first filter tank 10, so that negative pressure can still be generated in the first filter tank 10.

Example four

The structural principle of this embodiment is basically the same as that of the first to third embodiments, except that, as shown in fig. 7, in this embodiment, the water replenishing system 60 adds water to the last filtration tank 10 (fourth filtration tank 10) through the third water replenishing pipe 63, a third on/off valve 631 is provided on the third water replenishing pipe 63, and preferably, the third on/off valve 631 is a normally open solenoid valve; the third water replenishing pipe 63 is further provided with a float switch 632 located in the fourth filtering tank 10, when the water level of the fourth filtering tank 10 is lower than the sixth water level L, the float switch 632 is turned on, and when the water level reaches the sixth water level L, the float switch 632 is turned off. The water replenishing system 60 adds water to the remaining filter tanks 10 (the first to third filter tanks) through a fourth water replenishing pipe 64, for example, the fourth water replenishing pipe 64 divides three ways to add water to the first to third filter tanks, a fourth switch valve 641 is arranged on a header pipe of the fourth water replenishing pipe 64, the fourth switch valve 641 is a normally closed solenoid valve, for example, the fourth water replenishing pipe connected to the first filter tank is provided with the fourth switch valve 641, and the fourth water replenishing pipe connected to the second and third filter tanks is provided with the fourth switch valve 641.

The drain pump 31 is an immersed pump provided in the last filter tank 10, and a water inlet of the immersed pump is lower than the sixth water level L; of course, the drainage pump 31 may also be disposed on the water outlet pipe 30 outside the fourth filter tank 10, and the water inlet of the water outlet pipe 30 is located below the sixth water level L. The water delivery pump 121 is a water pump disposed outside the first tank, an inlet of the water pump is connected to a water delivery pipe 12, the water delivery pipe 12 extends into the first filtering tank 10, an inlet of the water delivery pipe 12 is lower than the sixth water level L, and optionally, a sixth water level meter 76 is disposed at the sixth water level L of the first filtering tank 10.

Initially, when water needs to be stored in the filter tanks 10, the third switch valve 631 and the fourth switch valve 641 are opened to replenish water into the four filter tanks 10, and when the water level in the filter tanks 10 reaches the sixth water level L, the fourth switch valve 641 is closed to stop adding water into the first to third filter tanks 10. When the water level in the fourth canister 10 reaches the sixth water level L, the float switch 632 is actuated to close the outlet of the third water replenishing pipe 63 to stop the addition of water into the fourth canister 10, so that the third on/off valve 631 does not need to be closed. When the water level of the fourth filtering tank reaches the sixth water level L, the drain pump 31, the water transfer pump 121 and the negative pressure generating structure 40 are operated, and the filtering cycle water tank performs the filtering operation.

In the present embodiment, the output terminal of the sixth water level meter 76 is connected to the first input terminal of the sixth comparator, the second input terminal of the sixth comparator is connected to the sixth threshold memory, when the water level detected by the sixth water level meter 76 is higher than the sixth threshold (sixth water level), the sixth comparator outputs a sixth trigger signal, the sixth trigger signal is connected to the closing control terminal of the fourth switch valve 611, and the sixth trigger signal is connected to the start control terminal of the drainage pump 31, the water delivery pump 121, and the negative pressure generating structure 40.

In the filtering process, when the water level in the fourth filtering tank 10 drops below the sixth water level L, the float switch 632 is turned on, the water supplementing system 60 supplements water to the fourth filtering tank 10 through the third water supplementing pipe 63, and until the water level reaches the sixth water level L, the float switch 632 is turned off.

In the present embodiment, the float switch 632 may be, but is not limited to, the float switches disclosed in CN201910977274.9, CN98247415.6, or CN201711366257.9, which are all the prior art, and the structure and principle thereof are not described herein again.

In another preferred embodiment, as shown in fig. 7, the central axes 111 of the filter structures 11 of the four filter canisters 10 are arranged hollow. The lower end of a central shaft 111 in the first filtering tank 10 has a gap with the bottom of the filtering tank 10, a water inlet of the first filtering tank 10 is positioned at the upper port of the central shaft 111, a funnel-shaped water inlet hopper 114 is connected to the upper end of the central shaft 111 for facilitating water inlet, water discharged from the water inlet pipe 20 can enter the water inlet hopper 114, and the upper end of the water inlet hopper 114 is higher than a sixth water level L so as to prevent sewage entering the first filtering tank 10 from being mixed with water filtered by the first filtering tank 10.

The sewage draining outlet of the filtering tank 10 is located at the bottom of the filtering tank 10, the water outlet is located above the uppermost filtering sheet, for example, the water outlet is located at the top, the water conveying pipe 12 extends into the first filtering tank 10, the water inlet of the water conveying pipe 12 is located below the sixth water level L, and the first valve 122 is arranged on the water conveying pipe 12. In the present embodiment, the water delivery pump 121 is a water pump disposed outside the first filtering tank 10 and is located on the water delivery pipe 12 between the first filtering tank 10 and the second filtering tank 10, but the water delivery pump 121 may also be a submersible pump disposed in the first filtering tank 10.

As shown in fig. 7, the lower end of the central shaft 111 of the second to fourth filter tanks 10 is fixedly connected to the bottom of the filter tank 10, the water outlet 102 of the filter tank 10 is communicated with the lower port of the central shaft 111, the water inlet 101 is located outside the central shaft 111 at the bottom of the filter tank 10, and in this embodiment, the water inlet 101 and the sewage outlet 103 are one port.

During filtering, sewage enters the water inlet hopper 114 from the top of the first filter tank 10 through the water inlet pipe 20, flows downwards through the hollow central shaft 111, flows to the bottom of the filter tank 10 and then flows upwards, dirt passes through the first filter sheet 112 and the second filter sheet 113 to realize first-stage filtering, the water filtered in the first filter tank 10 is pumped into the second filter tank 10 through the water delivery pump 121, flows from bottom to top, enters the inside of the central shaft 111 from the upper port of the central shaft 111 and flows downwards after the action of the filter sheets, enters the water delivery pipe 12 from the lower port of the central shaft 111, is continuously delivered into the next filter tank 10 for filtering until being filtered by the fourth filter tank 10, is pumped out by the water discharge pump 31, is delivered into a cleaning device needing water using through the water outlet pipe 30, or enters the first filter tank 10 for filtering again.

The water outlets of the third water replenishing pipe 63 and the fourth water replenishing pipe 64 are staggered with the upper end port of the central shaft 111, self-cleaning water enters the space outside the central shaft 111, and is discharged from the sewage discharge port 103 at the bottom of the filter tank 10 and outside the central shaft 111 during sewage discharge.

In another preferred embodiment, as shown in fig. 7, the outlet pipe 30 is further connected in parallel with a second outlet switch valve 34, and the first outlet switch valve 33 and the second outlet switch valve 34 are respectively an electric ball valve and a manual valve, so as to provide special use.

It should be noted that the filtration cycle water tank of this embodiment may also be provided with the sewage buffer tank 53, the sewage gas pipe 42, and the air explosion gas pipe 43 in the first to third embodiments.

In practice, the first to third embodiments may also adopt a structure in which the central shaft 111 is disposed in a hollow manner in the present embodiment.

It should be noted that in the present embodiment, as shown in fig. 7, the water inlet pipe 20 extends into the first canister 10 from the top of the first canister 10, and thus there is no need to provide a check structure.

EXAMPLE five

The structure principle of this embodiment is basically the same as that of the fourth embodiment, except that in this embodiment, the positions of the water inlet 101 and the water outlet 102 of the first canister 10 are different. As shown in fig. 8, in this embodiment, the lower end of the central shaft 111 in the first filter tank 10 is also fixedly connected to the bottom of the filter tank 10, the water outlet 102 of the first filter tank 10 is communicated with the lower port of the central shaft 111, the water inlet 101 is located outside the central shaft 111 at the bottom of the filter tank 10, the water inlet pipe 20 is provided with a check structure, for example, the check structure is the second valve 21 in the first embodiment, and the sewage outlet 103 is also the same as the water inlet 101. In this embodiment, the first valve 122 and the water pump 121 are disposed on the water pipe 12 between the first filtering tank 10 and the second filtering tank 10, and the first valve 122 is disposed at an end close to the inlet of the water pipe 12.

In the present embodiment, since the first to third canisters employ the principle of the communicating vessels, the fourth switching valve 641 is provided in the header pipe of the fourth replenishing pipe 64.

During filtering, sewage enters from the bottom of the first filtering tank 10 through the water inlet pipe 20, water flows from bottom to top, enters the central shaft 111 from the upper port of the central shaft 111 after the action of the filter disc, enters the water conveying pipe 12 from the lower port of the central shaft 111, and is conveyed to the second filtering tank 10 by the water conveying pump 121 for secondary filtering.

EXAMPLE six

The structural principle of this embodiment is basically the same as that of the fourth embodiment, except that, as shown in fig. 9, in this embodiment, the number of the negative pressure tanks 10a is two, for example, the first filtering tank and the second filtering tank are the negative pressure tanks 10a, and the third filtering tank and the fourth filtering tank are the normal pressure tanks 10 b.

In this embodiment, the first filtering tank 10 and the second filtering tank 10 have the same structure, the first filtering tank and the second filtering tank are connected in parallel, water in the water inlet pipe 20 can enter the two negative pressure tanks 10a, respectively, and the water pump 121 can pump out water in the first filtering tank and the second filtering tank.

Specifically, the water inlet pipe 20 is divided into two branch water inlet pipes 25, which are respectively connected to the water inlets of the two negative pressure tanks 10a, and each branch water inlet pipe 25 is provided with a third valve 251. The water outlets of the two negative pressure tanks 10a are connected with water delivery branch pipes 13, each water delivery branch pipe 13 is provided with a first valve 122, the water outlets of the two water delivery branch pipes 13 are communicated with the water inlet of the third filter tank 10 through a water delivery pipe 12, and a water delivery pump 121 is arranged on the water delivery pipe 12. The air exhaust pipe 41 is divided into two branch exhaust pipes 44, which are respectively connected to the air exhaust ports of the two negative pressure tanks 10a, and a fourth valve 441 is disposed on each branch water inlet pipe 25. In the present embodiment, the first valve 122 is a one-way valve that allows only water to be discharged, and has the same structure as that of the first embodiment; the third valve 251 is a check valve allowing only the entry, and may have the same structure as the first valve 122; the fourth valve 441 is a solenoid valve.

The two negative pressure tanks 10a of the present embodiment operate simultaneously or alternately. When the water pump works simultaneously, for example, when the four filter tanks have stable running water, the water delivery pump 121, the water suction pump 31, the negative pressure generating structure 40 and the two fourth valves 441 are opened. The first valve 122 is closed by the suction force generated by the negative pressure generating structure 40, the third valve 251 is opened, the water enters the two negative pressure tanks 10a through the water inlet branch pipe 25, the water is filtered in the two negative pressure tanks 10a, and the filtered water is delivered to the third filtering tank (the normal pressure tank 10b) by the water delivery pump 121.

When the two negative pressure tanks 10a work alternately, one of the negative pressure tanks 10a absorbs water, for example, the first filtering tank 10 absorbs water, and the specific process is as follows: the fourth valve 441 connected with the first filter tank is opened, the fourth valve 441 connected with the second filter tank is closed, the negative pressure generating structure 40 can only exhaust air from the first filter tank, and at the moment, the first filter tank absorbs water. When the water level of any one negative pressure tank 10a is higher than the water inlet end of the water delivery branch pipe 13 inserted into the negative pressure tank, the water delivery pump 121 pumps the water in the negative pressure tank to the third filter tank; when the water level of any one of the negative pressure tanks 10a is lower than the water inlet end of the water delivery branch pipe 13 inserted therein, water cannot be drawn out.

In this embodiment, because the negative pressure tanks 10a are connected in parallel, water entering the water inlet pipe 20 is subjected to primary filtration by the negative pressure tank 10a, and then to secondary filtration by the third filtration tank, and then to tertiary filtration by the fourth filtration tank, that is, to tertiary filtration.

In another preferred embodiment, as shown in fig. 9, a fifth valve 131 is further provided on the water delivery branch pipe 13 connected to each negative pressure tank 10a, and the fifth valve 131 is preferably a solenoid valve. When the two negative pressure tanks 10a are simultaneously operated, the two fifth valves 131 are opened; when the two negative pressure tanks 10a work alternately, for example, the first filter tank absorbs water, the fifth valve 131 connected to it is closed, so that the first filter tank only absorbs water, and the water pump 121 can only pump out the water in the second filter tank.

The manner of providing two negative pressure tanks 10a can also be applied to the first embodiment, the second embodiment, the third embodiment or the fifth embodiment, and the connection between the two negative pressure tanks 10a and the connection between the negative pressure tank 10a and the normal pressure tank 10b are the same as those described above, and are not described herein again.

It should be noted that in practice, the number of the negative pressure tanks 10a may be three or more, and the connection mode is communicated with the two negative pressure tanks 10a, and the working principle is the same, which is described herein. The filter tanks can be all negative pressure tanks 10 a; or a part of the negative pressure tank 10a and a part of the normal pressure tank 10 b.

EXAMPLE seven

The structure principle of this embodiment is basically the same as that of the first to sixth embodiments, and the difference is that, as shown in fig. 10, in this embodiment, an air exhaust valve 411 is provided on an air exhaust pipe 41, the air exhaust pipe 41 is communicated with an air intake branch pipe 412, an air intake valve 413 is provided on the air intake branch pipe 412, and an outlet of the air intake branch pipe 412 is located between the air exhaust valve 411 and an air inlet of the negative pressure generating structure 40.

In the first to sixth embodiments, since the water in the cleaning apparatus is discharged before the filter tank 10 is self-cleaned, and during self-cleaning and sewage disposal, the inlet of the negative pressure generating structure 40 is communicated with the outside atmosphere through the suction pipe 41, the first filter tank 10 and the water inlet pipe 20, and the negative pressure generating structure 40 can generate positive pressure air (compressed air).

Before self-cleaning, for example, when the water in the cleaning device is not exhausted, the solution of the present embodiment may be adopted, during self-cleaning and sewage disposal, the air exhaust valve 411 on the air exhaust pipe 41 is closed, the air intake valve 413 on the air intake branch pipe 412 is opened, and the negative pressure generating structure 40 sucks air from the outside atmosphere through the air intake branch pipe 412 to provide compressed air. In the present embodiment, the air inlet valve 413 and the air exhaust valve 411 may be controlled manually or automatically, and the automatic control may be performed according to the prior art and will not be described herein.

It should be noted that, in the seven embodiments, only two embodiments of the filter structure 11 are illustrated, and the filter structure 11 may also adopt other structures, such as a spiral filter sheet arranged on the central shaft 111, and the outer wall of the filter sheet is in contact with the inner wall of the filter tank 10; the filter structure 11 may also be other filter structures known in the art, such as a settling zone, a rotary sweeping device as disclosed in CN201711055312.2, or a filtration means as disclosed in CN 201510557871.8.

In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A filtering circulation water tank comprises a water inlet pipe, a water outlet pipe and a filtering system; the system is characterized by comprising at least one filter tank with a filter structure, wherein the filter tank is provided with a water inlet and a water outlet;

when the number of the negative pressure tanks is two or more, the two or more negative pressure tanks are connected in parallel, the two or more negative pressure tanks can work simultaneously or alternately, and the normal pressure tank is connected in series at the downstream of the negative pressure tank;

2. The filtration circulation tank as claimed in claim 1, wherein, when the number of the filtration tanks is two or more, the filtration tanks are vertically arranged;

a water delivery pipe for connecting the negative pressure tank and the normal pressure tank is provided with a water delivery pump for pumping the filtered water in the negative pressure tank to the normal pressure tank behind the negative pressure tank.

3. The filtration cycle water tank as claimed in claim 2, further comprising a water replenishing system, the water replenishing system is communicated with the inside of the filtration tank through a water replenishing pipe for replenishing water to the filtration tank, and the water replenishing pipe is provided with a switch valve;

4. The filtration cycle tank as claimed in claim 3, wherein the water replenishing system adds water to the atmospheric tank through a first water replenishing pipe, and the first water replenishing pipe is provided with a first on-off valve; the water replenishing system is used for adding water into the negative pressure tank through a second water replenishing pipe, and a second switch valve is arranged on the second water replenishing pipe;

a first water level meter capable of detecting a first water level and a second water level meter capable of detecting a second water level are arranged in the last filter tank, the second water level is higher than the first water level, and a water inlet of the drainage pump is lower than or located at the first water level;

the negative pressure tank is provided with a third water level instrument capable of detecting a third water level and a fourth water level instrument capable of detecting a fourth water level, the fourth water level is higher than the third water level, and a water inlet port of the water delivery pump is lower than or located at the third water level.

5. The filtration cycle water tank as claimed in claim 3, wherein the water replenishing system adds water to the last filtration tank through a third water replenishing pipe, and a third on/off valve is provided on the third water replenishing pipe; the water replenishing system adds water into the residual filter tank through a fourth water replenishing pipe, and a fourth switch valve is arranged on the fourth water replenishing pipe;

6. The filtration cycle tank as claimed in any one of claims 1 to 5, wherein the filtering structure comprises a fixedly arranged central shaft, a plurality of first filter sheets are arranged on the outer wall of the central shaft, gaps are formed between the outer edges of the first filter sheets and the inner wall of the filter tank, a plurality of second filter sheets which are staggered with the first filter sheets are arranged on the inner wall of the filter tank, and gaps are also formed between the outer edges of the second filter sheets and the central shaft;

the water inlets of all the filtering tanks are arranged at the bottom, and the water outlets are arranged in the middle or the middle upper part of the filtering tanks.

7. The filtration cycle tank as claimed in any one of claims 1 to 5, wherein the filtering structure comprises a hollow central shaft fixedly arranged, a plurality of first filter sheets are arranged on the outer wall of the central shaft, gaps are formed between the outer edges of the first filter sheets and the inner wall of the filtering tank, a plurality of second filter sheets staggered with the first filter sheets are arranged on the inner wall of the filtering tank, and gaps are also formed between the outer edges of the second filter sheets and the central shaft;

8. The filtration cycle water tank as claimed in any one of claims 3 to 5, wherein the drain outlets of the filtration tanks are commonly connected with a drain header pipe, the drain header pipe is provided with a drain header valve, the tail end of the drain header pipe is connected with a sewage buffer tank, the sewage buffer tank is provided with a sewage inlet and a sewage outlet, and the air outlet of the negative pressure generating structure is communicated with the sewage inlet through a drain air conveying pipe;

9. The filtration circulation tank of claim 8, wherein the blowoff valve comprises a valve seat arranged in a hollow manner and a buoyancy valve core positioned in the valve seat, a limiting block is fixedly arranged below the buoyancy valve core, the top of the valve seat is provided with an inlet, and the bottom of the valve seat is provided with an outlet;

10. The filtration circulation water tank as claimed in any one of claims 1 to 5, wherein a check structure is further provided at the inlet of the inlet pipe or the negative pressure tank, and the check structure is one of the following structures:

the structure three, be equipped with the aqueous vapor knockout drum on the inlet tube, the aqueous vapor knockout drum have with advance water piping connection's water inlet and delivery port, this water inlet is higher than the highest water level of first filtration jar normal water, the top of aqueous vapor knockout drum still has the gas outlet, the gas outlet pass through the breather pipe with first jar internal portion intercommunication.