CN209922922U - Commercial water dispenser pretreatment system free of multi-way valve control - Google Patents

Abstract

The utility model provides a pretreatment system of a commercial water dispenser without using a multi-way valve for control, which comprises a filter vat, wherein the filter vat is provided with a first water inlet pipeline, a first water outlet pipeline and a first sewage water outlet pipeline, and the first water inlet pipeline and the first water outlet pipeline are lapped with a first connecting pipeline; a three-way electromagnetic valve A is arranged at the position of the first water inlet pipeline and the first connecting pipeline, a valve C is arranged on the first water outlet pipeline, and a valve D1 is arranged on the first sewage water outlet pipeline; or the first water inlet pipeline and the first connecting pipeline are provided with a valve A11, the first connecting pipeline is provided with a valve A21, the outlet of the first water outlet pipeline is provided with a valve C, and the first sewage water outlet pipeline is provided with a valve D1. The utility model discloses a commercial water dispenser pretreatment systems cancellation uses traditional multiple unit valve to get rid of the contaminated material in the lauter tub, thereby reaches the purpose that just, reverse homoenergetic washed the lauter tub through design water flow pipeline and solenoid valve, can realize washing process automation, convenient characteristics of operation mode.

Description

Commercial water dispenser pretreatment system free of multi-way valve control

Technical Field

The utility model relates to a drinking water purification device technical field, more specifically relates to a commercial water dispenser pretreatment systems who exempts from to use multiple unit valve control.

Background

Large commercial reverse osmosis drinking water dispensers are typically drinking water treatment facilities that use reverse osmosis technology to treat the water, producing from 6 to 48 tons of pure water per day. Such devices are currently used in large numbers in central water supply systems in schools, factories, office buildings, and the like. Typical processes used with such equipment are: the raw water is filtered by the raw water sand barrel, the carbon barrel and the resin barrel, the filtering security barrel filters the reverse osmosis filtered pure water, and the obtained pure water can be drunk after post-filtration and sterilization treatment.

When the large commercial reverse osmosis water fountain is used for a certain time, pollutants generated by filtration can be reserved in each filter barrel, and almost no exception is made in the large commercial reverse osmosis water fountain on the market at present for preprocessing the pollutants by additionally arranging a multi-way valve. Namely, a multi-way valve is arranged on each filter barrel, and the process that the normal working filter material is reversely flushed and the filter material is normally flushed and returns to the normal working is controlled by the switching principle of the multi-way valve.

However, in a large number of long-term uses, it is concluded that the multi-way valve for this application has several disadvantages: 1) because the time is calculated by the rotation of the gear system, once the gear is blocked, the backflushing time is easy to make mistakes, and the water is cut off when the water is used; 2) the pipeline of the multi-way valve uses a water distributor to prevent the filter material from entering the multi-way valve, but the water distributor is easy to pass by foreign matters such as fine sand grains to cause the blockage of the multi-way valve, thereby influencing the production and the use; 3) the multi-way valve is integrally injection-molded, so that the multi-way valve cannot be maintained and can only be replaced; 4) the price is expensive; 5) when the cabinet type air conditioner is used in some cabinet type machines, the volume is relatively large, and the occupied space is large; 6) the barrel mouth of the filter barrel is designed according to the standard caliber of the back flush controller connected with the multi-way valve, and the barrel mouth is too small, so that the filter material is very inconvenient to replace.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving at least one defect in the prior art, providing a commercial water dispenser pretreatment systems who exempts from to use the multiple valve control, can realize washing process automation, convenient characteristics of operation mode.

The utility model adopts the technical scheme as follows:

a pretreatment system of a commercial water dispenser free of multi-way valve control comprises a filter barrel, wherein a first water inlet pipeline, a first water outlet pipeline and a first sewage water outlet pipeline are arranged on the filter barrel, and a first connecting pipeline is lapped at the middle position of the first water inlet pipeline and the first water outlet pipeline;

a three-way electromagnetic valve A is arranged at the lap joint of the first water inlet pipeline and the first connecting pipeline, a valve C is arranged at the outlet of the first water outlet pipeline, and a valve D1 is arranged on the first sewage water outlet pipeline;

or, first inlet channel with first connecting pipe overlap joint position is closer to one side of lauter tub is equipped with valve A11, be equipped with valve A21 on the first connecting pipe, first outlet conduit is equipped with valve C in the exit, be equipped with valve D1 on the first sewage outlet conduit.

Furthermore, two filter barrels are arranged and are connected in series, wherein the other filter barrel is provided with a second water inlet pipeline, a second water outlet pipeline and a second sewage water outlet pipeline, the second water inlet pipeline is connected with the first water outlet pipeline through a first transfer pipeline, at the moment, the valve C is arranged at the outlet of the second water outlet pipeline from the first water outlet pipeline, one end of the first connecting pipeline, which is lapped on the first water outlet pipeline, is arranged on the second water outlet pipeline, and a second connecting pipeline is lapped at the middle position of the first connecting pipeline and the first transfer pipeline,

a three-way electromagnetic valve B is arranged at the lap joint of the first connecting pipeline and the second connecting pipeline, and a valve D2 is arranged on the second sewage outlet pipeline;

or the first connecting pipeline and the second connecting pipeline are respectively provided with a valve B11 and a valve B21 at the rear ends of the lap joint positions, and the second sewage outlet pipeline is provided with a valve D2.

Furthermore, the three filter barrels are connected in series, a third water inlet pipeline, a third water outlet pipeline and a third sewage water outlet pipeline are arranged on the third filter barrel, the third water inlet pipeline is connected with the second water outlet pipeline through a second transfer pipeline, at the moment, the valve C is arranged at the outlet of the third water outlet pipeline from the second water outlet pipeline in a changing way, the first connecting pipeline is extended and lapped on the third water outlet pipeline, and a third connecting pipeline is lapped at the middle position of the first connecting pipeline and the second transfer pipeline,

a three-way electromagnetic valve E is arranged at the lap joint of the first connecting pipeline and the third connecting pipeline, and a valve D3 is arranged on the third sewage outlet pipeline;

or, the first connecting pipeline and the third connecting pipeline are respectively provided with a valve E11 and a valve E21 at the rear ends of the lap joint positions, and the third sewage outlet pipeline is provided with a valve D3.

Furthermore, the two filter barrels are respectively and sequentially arranged as a sand barrel and a carbon barrel.

Further, the three filter barrels are respectively and sequentially arranged as a sand barrel, a carbon barrel and a resin barrel.

Further, more than three filter barrels are arranged.

Furthermore, the valve A11, the valve A21, the valve B11, the valve B21, the valve C, the valve D1, the valve D2, the valve D3, the valve E11 and the valve E21 are all designed by adopting electromagnetic valves.

The utility model has the advantages that:

the utility model discloses a commercial water dispenser pretreatment systems, the cancellation uses the multiple unit valve pretreatment systems commonly used of prior art, changes to the washing control system that three-way solenoid valve or two lead to solenoid valve are constituteed, and convenient realization improves the stability and the convenience of filter vat washing process to the back flush of filter vat with just wash, can realize washing process automation, operation mode convenience.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings, there is shown in the drawings,

FIG. 1: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts a filter vat and a structure schematic diagram when the pretreatment system is controlled by a three-way electromagnetic valve;

FIG. 2: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts a filter vat and a schematic diagram of the valve opening and closing under each use state when the pretreatment system is controlled by a three-way electromagnetic valve;

FIG. 3: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts a filter vat and a structural schematic diagram when the pretreatment system is controlled by a two-way electromagnetic valve;

FIG. 4: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts a filter vat and a schematic diagram of the valve opening and closing under each use state when the two-way electromagnetic valve is adopted for controlling;

FIG. 5: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts two filter barrels and adopts a structural schematic diagram when the three-way electromagnetic valve is used for controlling;

FIG. 6: the utility model discloses a commercial drinking machine pretreatment system in the embodiment adopts two filter barrels and adopts a schematic diagram of valve opening and closing under each use state when three-way electromagnetic valve control is adopted;

FIG. 7: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts two filter barrels and adopts a structural schematic diagram when the two-way electromagnetic valve is used for controlling;

FIG. 8: the utility model discloses a commercial drinking machine pretreatment system in the embodiment adopts two filter barrels and adopts a schematic diagram of valve opening and closing under each use state when the two-way electromagnetic valve is used for controlling;

FIG. 9: the pretreatment system of the commercial water dispenser in the embodiment of the utility model adopts three filter barrels and a structural schematic diagram when the pretreatment system is controlled by a three-way electromagnetic valve;

FIG. 10: the embodiment of the utility model provides a commercial water dispenser pretreatment systems adopts three lauter tun and adopts the schematic diagram of valve switching under each user state when three solenoid valve control.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Example one

As shown in fig. 1, the utility model discloses a commercial water dispenser pretreatment systems who exempts from to use multichannel valve control, including the lauter tub 200, be equipped with first inlet channel 10, first outlet conduit 20 and first sewage outlet conduit 30 on the lauter tub 200, first inlet channel 10 with first outlet conduit 20 has first connecting pipe 50 in the position overlap joint in the middle.

In one embodiment, the first inlet conduit 10 is provided with a three-way solenoid valve a at the overlapping position with the first connecting conduit 50, the first outlet conduit 20 is provided with a valve C at the outlet, and the first waste outlet conduit 30 is provided with a valve D1.

In this embodiment, the valve C and the valve D1 are solenoid valves, and are opened and closed by an electromagnetic control three-way solenoid valve a, a valve C, and a valve D1.

In normal water supply, the water source is filtered by the lauter tub 200 to make the water quality clean, but the pollutants generated after the filtration are surely remained in the lauter tub 200, so that the lauter tub 200 needs to be washed after each use of the lauter tub 200 for a certain period of time to remove the pollutants.

With reference to fig. 1 and 2, during normal water supply filtration: the valve A10 of the three-way electromagnetic valve A is opened, the valve A20 is closed, the valve C is opened, the valve D1 is closed, the water source flows into the filter barrel 200 from the first water inlet pipeline 10, purified water is obtained after the water source is filtered by the filter barrel 200, and then the purified water flows out from the first water outlet pipeline 20.

Carrying out backwashing pretreatment on the filter barrel: the valve A20 of the three-way electromagnetic valve A is opened, the valve A10 is closed, the valve C is closed, the valve D1 is opened, the water source flows back into the filter barrel 200 from the first connecting pipeline 50 to the first water outlet pipeline 20 in a reverse flow manner, the filter materials are washed in the filter barrel 200 in a reverse direction, the pollutants remained in the filter barrel 200 are washed away in a reverse direction, and the pollutants are discharged from the first sewage outlet pipeline 30 along with the reverse flow.

Carrying out forward washing pretreatment on the filter vat: the valve A10 of the three-way electromagnetic valve A is opened, the valve A20 is closed, the valve C is closed, the valve D1 is opened, the water source flows into the filter vat 200 from the first water inlet pipeline 10, the filter vat 200 is positively washed when the water passes through the filter vat 200, and the washed water flow is discharged from the first sewage outlet pipeline 30.

Example two

The present embodiment is different from the first embodiment only in that: the three-way solenoid valve a in the first embodiment is changed into two-way solenoid valves.

Specifically, as shown in fig. 3, a valve a11 is disposed on one side of the first water inlet pipe 10, which is closer to the filter barrel 200 than the overlapping position of the first connecting pipe 50, a valve a21 is disposed on the first connecting pipe 50, a valve C is disposed at the outlet of the first water outlet pipe 20, and a valve D1 is disposed on the first sewage water outlet pipe 30.

With reference to fig. 3 and 4, during normal feed water filtration: valve a11 was open, valve a21 was closed, valve C was open, and valve D1 was closed.

Carrying out backwashing pretreatment on the filter barrel: valve a21 was open, valve a11 was closed, valve C was closed, and valve D1 was open.

Carrying out forward washing pretreatment on the filter vat: valve a11 was open, valve a21 was closed, valve C was closed, and valve D1 was open.

EXAMPLE III

In the embodiment, a filter barrel is added on the basis of the first embodiment.

Therefore, the present embodiment is based on the first embodiment, and the connection of the pipeline is adjusted locally, but the filtering and flushing principles are the same.

Specifically, as shown in fig. 5, two filter barrels 200 are provided, the two filter barrels 200 are connected in series, wherein the other filtering barrel 200 is provided with a second water inlet pipe 70, a second water outlet pipe 80 and a second sewage water outlet pipe 90, the second inlet conduit 70 is connected to the first outlet conduit 20 via the first transfer conduit 40, and, at this time, the valve C is arranged at the outlet of the second outlet pipe 80 from the first outlet pipe 20, the first connecting tube 50 overlaps the first outlet tube 20 at one end and instead overlaps the second outlet tube 80, the first connecting duct 50 overlaps the first transfer duct 40 at an intermediate position with a second connecting duct 60, the first connecting pipeline 50 is provided with a three-way electromagnetic valve B at the lap joint with the second connecting pipeline 60, and the second sewage outlet pipeline 90 is provided with a valve D2.

When normally supplying water, two the lauter tub 200 sets up in series, and the water source is filtered the back by lauter tub I, filters through lauter tub II again, and twice filters, and the filter effect is better. As filtration continues, contaminants are generated to varying degrees in both laundries I and II, requiring pretreatment of laundries I and II after each use period. In the pretreatment of the filter bowl I and the filter bowl II, the filter bowl I and the filter bowl II are independently pretreated.

With reference to fig. 5 and 6, during normal feed water filtration: the valve A10 of the three-way electromagnetic valve A is opened, the valve A20 is closed, the valve B10 of the three-way electromagnetic valve B is opened, the valve B20 is closed, the valve C is opened, the valve D1 is closed, the valve D2 is closed, a water source flows into the filter vat I from the first water inlet pipeline 10, primary purified water obtained after filtration through the filter vat I flows out from the first water outlet pipeline 20 again, and primary filtration is carried out on the water source; the water source is transferred from the first outlet conduit 20 to the second inlet conduit 70 through the first transfer conduit 40, so that the water enters the filter barrel II, and the purified water obtained after filtration by the filter barrel II flows out from the second outlet conduit 80.

Carrying out backwashing pretreatment on the filter vat I: a10 valve of the three-way electromagnetic valve A is closed, an A20 valve is opened, a B10 valve of the three-way electromagnetic valve B is opened, a B20 valve is closed, a valve C is closed, a valve D1 is opened, a valve D2 is closed, a water source is transmitted into the first water outlet pipeline 20 from the first connecting pipeline 50 through the second connecting pipeline 60 and reversely flows back into the filter vat I, the filter material is reversely flushed in the filter vat I, pollutants remained in the filter vat I are reversely flushed away, and the pollutants are discharged from the first sewage outlet pipeline 30 along with reverse water flow.

Carrying out forward washing pretreatment on the filter vat I: the valve A10 of three way solenoid valve A is opened, the valve A20 is closed, the valve B10 of three way solenoid valve B is opened, the valve B20 is closed, the valve C is closed, the valve D1 is opened, the valve D2 is closed, the water source flows into the filter vat I from first inlet channel 10, carries out forward washing to the filter vat I when passing through the filter vat I, and the rivers after washing are discharged from first sewage outlet conduit 30.

Carrying out backwashing pretreatment on the filter vat II: the valve A10 of three way solenoid valve A is closed, the valve A20 is opened, the valve B10 of three way solenoid valve B is closed, the valve B20 is opened, the valve C is closed, the valve D1 is closed, the valve D2 is opened, the water source flows back to the filter vat II from the first connecting pipeline 50 to the second outlet conduit 80 in a countercurrent manner, and the filter material is washed away in the filter vat II in a reverse manner, so that pollutants remained in the filter vat II are washed away in a reverse manner and discharged from the second sewage outlet conduit 90 along with reverse water flow.

Carrying out forward washing pretreatment on the filter vat II: the valve of A10 of three way solenoid valve A is closed, the valve of A20 is opened, the valve of B10 of three way solenoid valve B is opened, the valve of B20 is closed, valve C is closed, valve D1 is closed, valve D2 is opened, the water source flows into lauter tub II from first connecting tube 50 through second connecting tube 60 to second inlet channel 70 again, carry out forward washing to lauter tub II when through lauter tub II, rivers after washing are discharged from second sewage outlet conduit 90.

Example four

In the present embodiment, a filter barrel is added on the basis of the second embodiment, and the structure and principle of the present embodiment are similar to those of the third embodiment.

Specifically, the present embodiment is different from the third embodiment only in that: the three-way electromagnetic valve a in the third embodiment is changed into two-way electromagnetic valves, and the three-way electromagnetic valve B is also changed into two-way electromagnetic valves.

As shown in fig. 7, more specifically, the first connecting pipe 50 and the second connecting pipe 60 are respectively provided with a valve B11 and a valve B21 at the rear end of the overlapping position, and the second effluent outlet pipe 90 is provided with a valve D2.

With reference to fig. 7 and 8, during normal feed water filtration: valve a11 was open, valve a21 was closed, valve B11 was open, valve B21 was closed, valve C was open, valve D1 was closed, and valve D2 was closed.

Carrying out backwashing pretreatment on the filter vat I: the valve A11 is closed, the valve A21 is opened, the valve B11 is opened, the valve B21 is closed, the valve C is closed, the valve D1 is opened, the valve D2 is closed, a water source is transmitted into the first water outlet pipeline 20 from the first connecting pipeline 50 through the second connecting pipeline 60 and then flows back into the filter vat I, the filter material is washed in the filter vat I in the reverse direction, pollutants remained in the filter vat I are washed away in the reverse direction, and the pollutants are discharged from the first sewage outlet pipeline 30 along with the reverse water flow.

Carrying out forward washing pretreatment on the filter vat I: the valve A11 is opened, the valve A21 is closed, the valve B11 is closed, the valve B21 is closed, the valve C is closed, the valve D1 is opened, the valve D2 is closed, a water source flows into the filter vat I from the first water inlet pipeline 10, the filter vat I is positively washed when the water source passes through the filter vat I, and the washed water flow is discharged from the first sewage outlet pipeline 30.

Carrying out backwashing pretreatment on the filter vat II: the valve A11 is closed, the valve A21 is opened, the valve B11 is closed, the valve B21 is opened, the valve C is closed, the valve D1 is closed, the valve D2 is opened, the water source flows back into the filter vat II from the first connecting pipeline 50 to the second water outlet pipeline 80 in a reverse flow manner, the filter material is flushed in the filter vat II in a reverse direction, the pollutants remained in the filter vat II are flushed away in a reverse direction, and the pollutants are discharged from the second sewage outlet pipeline 90 along with the reverse flow.

Carrying out forward washing pretreatment on the filter vat II: valve A11 is closed, valve A21 is opened, valve B11 is opened, valve B21 is closed, valve C is closed, valve D1 is closed, valve D2 is opened, the water source flows into lauter tub II from first connecting tube 50 through second connecting tube 60 to second inlet channel 70, forward washing is carried out to lauter tub II when lauter tub II is passed through, and the rivers after washing are discharged from second sewage outlet conduit 90.

EXAMPLE five

In this embodiment, two filter barrels are added on the basis of the first embodiment, or one filter barrel is added on the basis of the third embodiment.

Therefore, the present embodiment is based on the first embodiment and the third embodiment, and the connection of the pipeline is adjusted in some parts, but the filtering and flushing principles are the same.

Specifically, as shown in fig. 9, three filter barrels 200 are provided, three filter barrels 200 are connected in series, a third water inlet pipe 102, a third water outlet pipe 103 and a third sewage outlet pipe 104 are provided on the third filter barrel 200, the third water inlet pipe 102 is connected to the second water outlet pipe 80 through a second transfer pipe 106, at this time, the valve C is changed from the second water outlet pipe 80 to the outlet of the third water outlet pipe 103, the first connecting pipe 50 is extended and lapped on the third water outlet pipe 103, the third connecting pipe 101 is lapped between the first connecting pipe 50 and the second transfer pipe 106, a three-way electromagnetic valve E is provided at the lapping position of the first connecting pipe 50 and the third connecting pipe 101, and a valve D3 is provided on the third sewage outlet pipe 104.

In another embodiment, the first connecting pipe 50 and the third connecting pipe 101 are respectively provided with a valve E11 and a valve E21 at the rear end of the overlapping position, and the third waste water outlet pipe 104 is provided with a valve D3.

In this embodiment, only the number of the filter barrels is increased, and the functions and principles thereof and the water flow directions of the forward and reverse washing can be inferred by referring to fig. 9 and 10 and the above embodiments, and the description thereof is omitted.

It can be understood that the principle adopted by the present embodiment is to design the water flow pipeline and the electromagnetic valve so as to achieve the purpose of flushing the lauter tub 200 in both forward and reverse directions, and the number of lauter tubs 200 can be increased or decreased in an infinite number based on the principle of the present embodiment.

Thus, in some embodiments, when a two-barrel 200 filtration system is employed, the two barrels 200 are sequentially configured as a sand barrel and a carbon barrel, respectively; when a filtering system of three filter barrels 200 is adopted, the three filter barrels 200 are respectively set as a sand barrel, a carbon barrel and a resin barrel in sequence. Obviously, the lauter tub 200 may be provided with more than three.

The valve A11, the valve A21, the valve B11, the valve B21, the valve C, the valve D1, the valve D2, the valve D3, the valve E11 and the valve E21 are all designed by adopting electromagnetic valves.

Certainly, in some embodiments, the filtering barrel with the detachable cover body can be used for replacing a small-caliber filtering barrel, and the original water distributor is replaced by the water distributor with a smaller caliber and a larger overflowing area, so that the water distributor has the characteristics of automatic flushing process and convenient operation mode. Meanwhile, the device has a series of advantages of large flow, high efficiency, easy manufacture, convenient maintenance, low manufacture cost and the like.

To sum up, the utility model discloses a commercial water dispenser pretreatment systems cancels and uses the multiple unit valve pretreatment systems commonly used of prior art, changes to the washing control system that three-way solenoid valve or two lead to solenoid valve are constituteed, and convenient realization improves the stability and the convenience of filter vat washing process to the back flush and the positive washing of filter vat, can realize washing process automation, operation mode convenience.

As long as the idea created by the present invention is not violated, various different embodiments of the present invention can be arbitrarily combined, and all the embodiments should be regarded as the content disclosed by the present invention; the utility model discloses an in the technical conception scope, carry out multiple simple variant and different embodiments to technical scheme and go on not violating the utility model discloses the arbitrary combination of the thought of creation all should be within the protection scope.

Claims (7)

1. A commercial water dispenser pretreatment system free of multi-way valve control is characterized by comprising a filter barrel (200), wherein a first water inlet pipeline (10), a first water outlet pipeline (20) and a first sewage water outlet pipeline (30) are arranged on the filter barrel (200), and a first connecting pipeline (50) is lapped at the middle position of the first water inlet pipeline (10) and the first water outlet pipeline (20);

a three-way electromagnetic valve A is arranged at the lap joint of the first water inlet pipeline (10) and the first connecting pipeline (50), a valve C is arranged at the outlet of the first water outlet pipeline (20), and a valve D1 is arranged on the first sewage water outlet pipeline (30);

or, first inlet channel (10) with first connecting tube (50) overlap joint position is closer to one side of lauter tub (200) is equipped with valve A11, be equipped with valve A21 on first connecting tube (50), first outlet channel (20) are equipped with valve C at the exit, be equipped with valve D1 on first sewage outlet conduit (30).

2. The pretreatment system of a commercial water dispenser without using a multi-way valve for control according to claim 1, wherein two filter barrels (200) are provided, and two filter barrels (200) are connected in series, wherein the other filter barrel (200) is provided with a second water inlet pipe (70), a second water outlet pipe (80) and a second sewage outlet pipe (90), the second water inlet pipe (70) is connected with the first water outlet pipe (20) through a first transfer pipe (40), at this time, the valve C is changed from the first water outlet pipe (20) to the outlet of the second water outlet pipe (80), the first connection pipe (50) is overlapped with the first water outlet pipe (20) at one end and is overlapped with the second water outlet pipe (80), and a second connection pipe (60) is overlapped with the first transfer pipe (40) at an intermediate position of the first connection pipe (50),

a three-way electromagnetic valve B is arranged at the lap joint of the first connecting pipeline (50) and the second connecting pipeline (60), and a valve D2 is arranged on the second sewage outlet pipeline (90);

or the first connecting pipeline (50) and the second connecting pipeline (60) are respectively provided with a valve B11 and a valve B21 at the rear ends of the overlapping positions, and the second sewage outlet pipeline (90) is provided with a valve D2.

3. The pretreatment system of a commercial water dispenser without multi-way valve control according to claim 2, it is characterized in that the filter barrels (200) are provided with three filter barrels (200), the three filter barrels (200) are connected in series, the third filter barrel (200) is provided with a third water inlet pipeline (102), a third water outlet pipeline (103) and a third sewage water outlet pipeline (104), the third water inlet pipe (102) is connected with the second water outlet pipe (80) through a second transfer pipe (106), the valve C is arranged at the outlet of the third water outlet pipeline (103) from the second water outlet pipeline (80), the first connecting pipeline (50) is extended and lapped on the third water outlet pipeline (103), a third connecting duct (101) is overlapped at an intermediate position between the first connecting duct (50) and the second transfer duct (106),

a three-way electromagnetic valve E is arranged at the lap joint of the first connecting pipeline (50) and the third connecting pipeline (101), and a valve D3 is arranged on the third sewage outlet pipeline (104);

or the first connecting pipeline (50) and the third connecting pipeline (101) are respectively provided with a valve E11 and a valve E21 at the rear ends of the overlapping positions, and the third sewage outlet pipeline (104) is provided with a valve D3.

4. The pretreatment system of a commercial water dispenser without using a multi-way valve for control according to claim 2, wherein two filter barrels (200) are respectively and sequentially arranged as a sand barrel and a carbon barrel.

5. The pretreatment system of a commercial water dispenser without using a multi-way valve for control according to claim 3, wherein three filter barrels (200) are respectively and sequentially arranged as a sand barrel, a carbon barrel and a resin barrel.

6. The pretreatment system for a commercial water dispenser without multi-way valve control according to claim 3, wherein the filter barrel (200) is provided with more than three.

7. The pretreatment system of a commercial water dispenser free of multi-way valve control as claimed in claim 3, wherein the valve A11, the valve A21, the valve B11, the valve B21, the valve C, the valve D1, the valve D2, the valve D3, the valve E11 and the valve E21 are all designed by electromagnetic valves.

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