WO2015061929A1

WO2015061929A1 - Train water supply apparatus and control method therefor

Info

Publication number: WO2015061929A1
Application number: PCT/CN2013/001472
Authority: WO
Inventors: 李旻; 王艳; 郑金霞; 邢喆; 严巾堪; 曲凯
Original assignee: 山东华腾环保科技有限公司
Priority date: 2013-10-28
Filing date: 2013-11-29
Publication date: 2015-05-07
Also published as: EP3064655B1; EP3064655A1; EP3064655A4

Abstract

Disclosed are a train water supply apparatus and a control method thereof. The apparatus comprises a purified water tank, a water tank I, a water tank II, an injector, connecting pipelines, and valve members. The water tank I is separately connected to the purified water tank and to the water tank II by means of a water suction pipeline and an intermediate pipeline. The water tank II is connected to a water-consuming component by means of a water supply pipeline. The upper part of the water tank I is separately connected to a vacuum-pumping port of the injector and a train gas source by using an exhaust pipeline and a water and gas supply pipeline I. The upper part of the water tank II is separately connected to the air and the train gas source by means of an exhaust pipeline and a water and air supply pipeline II. The water tank I is provided with a liquid level switch I and a liquid level switch II from top to bottom. The water tank II is provided with a liquid level switch III, a liquid level switch IV and a liquid level switch V from top to bottom. The apparatus can continuously supply water, reliably operates, needs low use and maintenance cost, and has no special bearing requirements on the purified water tank, and can be mounted on the bottom of a train as needed.

Description

Train water supply device and control method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply apparatus and a control method therefor, and more particularly to a train water supply apparatus for continuous water supply using compressed air on a train. BACKGROUND OF THE INVENTION Train water supply systems are used to provide clean water for toilets, kitchens, electric water heaters, and the like of trains. The traditional train water supply system generally adopts a large clean water tank at the bottom of the train, and a small clean water tank at the top of the train. The water in the large clean water tank at the bottom of the train is pumped to the small clean water tank at the top of the train, and then gravity self-flow is used. The method of supplying water to each water point in a small water tank. With the development of high-speed trains, in order to reduce the train section and reduce the center of gravity of the vehicle, there is not enough space on the roof to place a small clean water tank that meets the needs. For this reason, most of the clean water tanks are placed at the bottom of the train when designing high-speed trains, which not only reduces the center of gravity of the train, but also improves the smooth running of the vehicle. The prior art water supply method at the bottom of the train is realized by two types of electric discharge pumps and air pressure. Among them, the electric pump method is pressurized by the electric water pump, and the defect is that the electric pump is sensitive to the conveying medium. In order to make the electric pump operate normally, a complicated system needs to be configured, so the equipment investment and maintenance cost are high. Despite this, the electric pump system often has problems such as frequent pump start-up, blockage and burnout, poor start-up of the pump, water leakage, and idling. At the same time, due to the poor self-priming ability of the electric pump, it is generally suspended and installed under the train floor together with the clean water tank. The electric pump broke when the train was running and could not be repaired online. For example, the Chinese patent document CN200820115114. 0 discloses the "waterway water supply system water shortage protection control device and method", which includes a water tank, a water pump, a water pump control device, a water suction pipe, a water supply pipe, a water supply pressure sensor, a water supply flow sensor, Water level detection sensor, suction pressure sensor, pressure buffer tank. It uses water level detection and air pressure detection in the pipeline to combine water pump water shortage protection. Although this water supply system realizes the pressurized water supply at the bottom of the train, the system is complicated, and the failure rate of the electric pump system is high. For example, if the electric pump fails, it can only be parked for maintenance. Pneumatic water supply uses the compressed air of the train air supply system to directly pressurize the purified water in the clean water tank at the bottom of the train. The defect is that this method has pressure requirements for the clean water tank, pipeline and related valve parts. Since the clean water tank is generally large in size, the clean water tank with pressure requirements will greatly increase its weight and have hidden dangers. At the same time, when the train stops and the water tank is filled, the water supply will be interrupted, which is not in line with the user. Water habits. A pump-less water supply device for mobi le use is disclosed in the international patent document W02010070075A1, which comprises a clean water tank for storing clean water and a connecting pipe for conveying water to the user, There are two intermediate buffer vessels on the pipeline and connected to the clean water tank. A pressure control device is respectively connected with the clean water tank and the two intermediate buffer containers, and the water is transported from the clean water tank to the intermediate buffer tank by the pressure difference between the clean water tank and the intermediate buffer tank, and then the water is transported by the intermediate buffer tank. To the user. Although the water supply device can deliver water from the clean water tank to the user, the water tank needs to be pressurized, and the water supply is interrupted when the water tank is filled with water. SUMMARY OF THE INVENTION The main object of the present invention is to solve the above-mentioned deficiencies of the prior art; provide a train water supply device; can be installed at the bottom of the vehicle according to needs, has low maintenance cost, reliable operation, and has no special pressure requirement for the water purification tank, Uninterrupted water supply.

To achieve the above object, the present invention adopts the following technical solutions:

A train water supply device includes a water purification tank, a water tank I, a water tank II and an ejector, the water tank I is connected to the water purification tank through a water absorption pipeline, and the water tank I is connected to the water tank II through an intermediate pipeline, the water tank II is connected to the water appliance through the water supply pipeline, and the upper part of the water tank I is connected to the vacuum port of the injector through the evacuation pipeline, and the air source interface of the injector is connected to the air source of the train through the evacuation air supply pipeline; The upper part of the water tank I is connected to the train air source through the feed water supply line I, the upper part of the water tank II is connected to the atmosphere through the exhaust line; and the water tank 连接 is connected to the train air source through the feed water supply line II; The liquid level switch I and the liquid level switch II are provided from top to bottom, and the water tank II is provided with a liquid level switch III, a liquid level switch IV and a liquid level switch V from top to bottom.

The top of the clean water tank is in communication with the atmosphere.

The intermediate line has a check valve I.

The water supply line has a one-way wide II and a two-way valve II.

The exhaust port of the injector is open to the outside atmosphere.

The evacuation pipeline is provided with a two-way valve VI; the evacuated air supply pipeline is provided with a vacuum filtration pressure reducing valve and a two-way valve III. The feed water supply line I is provided with a two-way valve V and a feed water filter pressure reducing valve; the feed water supply line II is provided with a two-way valve π, and shares a feed water filter pressure reducing valve with the feed water supply line I.

The water absorption pipeline is provided with a two-way valve I and a water filter; the exhaust pipeline is provided with a throttle valve and a two-way valve IV.

The control method of the train water supply device is as follows:

The control method of the water tank I is as follows:

Step 1-1: After the system starts working, first determine whether the liquid level in the water tank I reaches the upper liquid level indicated by the liquid level switch I; if the upper liquid level is not reached, the water tank II is set to the water supply state, and the water tank I is set. To prepare the state, simultaneously open the two-way valve VL to close the two-way wide V, proceed to step 1-3; if the upper liquid level has been reached, proceed to step 1-2;

Step 1-2: Determine if the liquid level in the tank I is lower than the lower level indicated by the level switch II. If yes, set the tank II to the water supply state, set the tank I to the ready state, open the two-way valve νπ, close the two-way valve ν, and proceed to step 1-

3; If no, set the water tank I to the water supply state, set the water tank II to the ready state, and open the two-way valve V at the same time, close the second Pass valve VD, return to step 1-2;

Step 1-3: Open the two-way valve VI and delay t to discharge the compressed air in the water tank 1. Open the two-way valve III, the injector starts to vacuum the water tank I; after the delay t ₂ and then open the two-way valve I, the water in the clean water tank begins to flow into the water tank I through the suction line under the action of atmospheric pressure until the water tank After the liquid level in I reaches the upper liquid level indicated by the liquid level switch I, the two-way valve VI is closed; after the delay t ₃ , the two-way valve III is closed, the injector stops working; since the injector is just closed; after the delay t ₄ Close the two-way valve I, the water in the suction line stops flowing, and proceeds to step 1-4;

Step 1-4: Determine whether the control system receives the stop command, and if not, return to step 1-2, and if yes, the process terminates;

The control method of the water tank II is:

Step 2-1: After the system starts working, first judge whether the liquid level in the water tank 达到 has reached the upper liquid level indicated by the liquid level switch III. If yes, go to step 2-2; if no, it means that there is less water in the water tank II, and when the water tank I is waiting for the water supply state, turn on the two-way wide IV, and discharge the gas in the water tank II until the liquid in the water tank II After reaching the upper liquid level indicated by the liquid level switch III, proceed to step 2-2;

Step 2-2: Determine whether the liquid level in the water tank II is lower than the middle liquid level indicated by the liquid level switch IV; if not, open the two-way valve II for water supply and return to 2-1; if yes, then judge the water tank II Whether the liquid level reaches the lower liquid level indicated by the liquid level switch V; if not, if the water quantity in the water tank II is insufficient, the two-way wide II is closed, the water supply is suspended and the "water supply device low water level" alarm is issued, and then the steps 2-3 are entered. If yes, open the two-way 闽 II for water supply, and proceed to steps 2 - 3;

Step 2-3: Determine whether the water tank I is in the water supply state at this time; if not, return to step 2-2; if yes, open the two-way valve IV to discharge the gas in the water tank II through the exhaust line, in the water tank I The water enters the water tank II through the intermediate pipeline, and the liquid level in the water tank II rises; further, it is judged that the liquid level in the water tank II is the medium liquid level indicated by the liquid level switch IV; if not, the process returns to the step 2-2; if yes, Then judge whether the two-way valve II is in the open state; if not, open the two-way valve II and clear the "water supply device low water level" alarm, proceed to step 2 - 4; if yes, go directly to step 2-4;

Step 2-4: Determine whether the liquid level in the water tank II reaches the upper liquid level indicated by the liquid level switch ;; if not, return to step 2-2 to continue the exhaust; if yes, close the two-way wide IV, and the exhaust stop , go to step 2-5;

Step 2-5: Determine if the control system receives the stop command. If not, return to step 2-2. If yes, the process ends.

Preferably, the ejector adopts a multi-stage form, which has the characteristics of high ultimate vacuum and high efficiency.

Preferably, the vacuum filtration pressure reducing valve, the two-way valve III, the injector, the two-way valve IV, the throttle valve, the feed water filtration pressure reducing valve, the two-way valve V, the two-way valve VI, the two-way valve are integrated in one The integrated pneumatic version makes the structure more compact and easy to maintain. The beneficial effects of the invention are -

1. There is no need to set up a water tank at the top of the train, which reduces the center of gravity of the train and improves the smooth running of the vehicle. It is especially suitable for high-speed railway trains.

2. Compared with the existing electric pump method, the system is simpler in construction, consisting of an ejector without moving parts and a highly reliable valve member. There is no motor failure, transmission failure, sealing failure of the rotating parts inherent in the electric pump mode. Therefore, it is more reliable and the maintenance cost is low.

3. Compared with the existing electric pump mode, the system layout is more reasonable. According to the needs (such as the dining car and other requirements for high reliability of water supply), the clean water tank is placed under the train floor, and other water tanks and valve parts Waiting on the train floor. If the water supply unit fails during the train, no maintenance is required for maintenance.

4. Compared with the existing air pressure mode, there is no need to pressurize the clean water tank. There is no special pressure requirement for the clean water tank, which makes the water tank light in weight, safe and reliable in operation and use, and is especially suitable for high-speed railway trains. Especially when the train is parked and the water tank is filled with water, the water supply is uninterrupted, which is convenient for passengers to use water at any time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of a water tank I of the present invention; FIG. 3 is a flow chart of the operation of a water tank II of the present invention. In the figure, 1. clean water tank, 2. water equipment, 3. outside air atmosphere, 4. air source, 5. water tank I, 6. water tank II, 7. water filter, 8. two-way valve I, 9. Check valve I, 10. Check valve II, 11. Two-way wide II, 12. Vacuum filter pressure reducing valve, 13. Two-way valve III, 14. Injector, 15. Two-way valve IV, 16. Flow valve, 17. Water supply filter pressure reducing valve, 18. Two-way valve V, 19. Two-way wide VI, 20. Two-way valve VL 21a. Level switch I, 21b. Level switch II, 22a. Level switch III, 22b. Level switch IV, 22c. Level switch. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described with reference to the accompanying drawings and specific embodiments. As shown in Fig. 1, a train water supply device includes a water purification tank 1, a water tank 15, a water tank 116, and an ejector 14. The top of the clean water tank 1 communicates with the atmosphere, maintains normal pressure, and has no pressure requirement, so the clean water tank is light in weight. The water tank I 5 is connected to the clean water tank 1 through a water suction pipe for temporarily storing the purified water flowing out of the clean water tank 1. The suction pipe is used to transport the purified water from the clean water tank 1 to the water tank I 5 , and the water suction pipe is provided with a water filter Ί and a two-way valve I 8 .

The water tank 15 and the water tank 116 are connected by an intermediate pipe. There is a check valve 1 9 on the middle line to keep the water from being water Box II 6 flows to tank I 5 .

The water tank 116 is connected to the water appliance 2 through a water supply line. There are check valves Π 10 and two-way valves II 11 on the water supply line. The check valve II 10 prevents water from being returned to the water supply by the water appliance 2.

The upper portion of the water tank I 5 is connected to the vacuum port of the ejector 14 through an evacuation line. The air supply port of the ejector 14 is connected to the air source 4 of the train (pressure is 0.5 to 1.0 MPa) by evacuating the air supply line. The exhaust port of the ejector 14 is open to the outside atmosphere 3 . The ejector 14 is for generating a negative pressure in the water tank I 5 , thereby causing the water to flow through the water suction pipe to the water tank 1 to the water tank I 5 . A two-way valve VI19 is provided on the evacuation line. The evacuated air supply line is provided with a vacuum filter pressure reducing valve 12 and a two-way wide 11113. The pumping pressure reducing valve 12 is used to filter the compressed air and adjust to the pressure required for the operation of the injector 14 (e.g., 0.4 to 0.7 MPa). The upper portion of the water tank I 5 is also connected to the outlet of the feed water filtration pressure reducing valve 17 through the feed water supply line I. The inlet of the feed water filtration pressure reducing valve 17 is connected to the gas source 4 of the train for removing oil mist and impurities therein, cleaning the compressed air, and adjusting the pressure required for the water supply (for example, 5 (T200 KPa). The water supply line I is provided. Two-way valve V 18.

The upper portion of the water tank II 6 is connected to the outlet of the feed water filtration pressure reduction line 17 through the feed water supply line II. Feed water supply line II is equipped with two-way valve VII20. The upper part of the water tank 116 is also discharged to the outside of the vehicle through the exhaust line. A throttle valve 16 and a two-way wide IV15 are provided on the exhaust line. The throttle valve 16 is used to control the exhaust speed of the water tank 116 to ensure that the water supply pressure during the exhaust is relatively stable.

The water tank I 5 is provided with a liquid level switch I 21a and a liquid level switch II 21b from top to bottom for detecting the upper liquid level and the lower liquid level of the water tank I 5 , respectively. The water tank 116 is provided with a liquid level switch 11122&, a liquid level switch IV22b and a liquid level switch V22c from the top to the bottom, respectively for detecting the upper liquid level, the middle liquid level and the lower liquid level of the water tank 116.

The workflow of the present invention is divided into two parts: a work flow tank and a water tank Π6 work flow. The two parts are executed in parallel and are relatively independent in function and related. The water tank 1 5 and the water tank II 6 are all ready during start-up, and only one is in the water supply state during operation.

The control method of the water tank I is as follows: When the liquid level in the water tank 15 is lower than the upper liquid level of the water tank 15 when the power is turned on, the negative pressure is generated in the water tank I 5 by the operation of the ejector, and the water in the clean water tank 1 is The tank I 5 is sucked in until the liquid level in the tank I 5 reaches the upper level of the tank 15 and is added to the subsequent process. In the subsequent process, when the liquid level in the water tank 15 is lower than the lower liquid level of the water tank 15, the water tank 116 is set to the water supply state, the water tank 1 5 is set to the ready state, and the water tank is operated by the ejector to make the water tank 1 5 A negative pressure is generated inside, and the water in the clean water tank is sucked into the water tank I until the liquid level in the water tank 15 reaches the upper liquid level of the water tank 15. When the liquid level in the water tank 15 is not lower than the lower liquid level of the water tank 15, the water tank 1 5 is set to the water supply state, the water tank 116 is set to the ready state, and the water flows from the water tank 15 to the water appliance;

The working process of the water tank II is: When the power is turned on, if the liquid level in the water tank 116 is lower than the upper liquid level of the water tank 116, and the water tank 15 is in the water supply state, the two-way valve IV15 is opened, and the water tank 116 is opened through the exhaust line. Gas is discharged until the water tank 116 The liquid level in the tank reaches the upper level of the water tank 116, and then the two-way valve IV15 is closed, and the subsequent process is entered. In the subsequent work, if the liquid level in the water tank Π6 is not lower than the middle liquid level of the water tank 116, the two-way valve 1111 is opened to supply water through the water supply line. If the liquid level in the water tank Π 6 is lower than the lower liquid level of the water tank 116, the two-way valve 11 11 is closed, the water supply is suspended, and the "water supply low water level" alarm is issued. If the liquid level in the water tank 116 is lower than the middle liquid level of the water tank Π6 and not lower than the lower liquid level, the two-way valve 1111 is opened, water is supplied through the water supply line, and when the water tank 15 is in the water supply state, the two-way is opened. The valve IV discharges the gas in the water tank 116 through the exhaust line, and the liquid level in the water tank 116 rises. When the liquid level in the water tank II 6 rises to the middle liquid level of the water tank II 6 , if the two-way valve 1111 is in the closed state, the two-way valve 1111 is opened, and the possible "water supply low water level" alarm may be released until The liquid level in the water tank 116 rises to the upper liquid level of the water tank 116, and then the two-way wide IV15 is closed, and the exhaust gas stops.

As shown in Figure 2, the specific workflow of the water tank I 5 is:

Step 1-1: After the system starts working, first judge the liquid level H in the water tank I 5 and reach the upper liquid level indicated by the liquid level switch I 21a. If the upper level is not reached, set the water tank 116 to the water supply state, set the water tank 1 5 to the ready state, open the two-way valve VII20, close the two-way wide V 18, and proceed to steps 1-3. If the upper level has been reached, proceed to step 1-2.

Step 1-2: Determine if the liquid level H in the water tank 1 5 is lower than the lower liquid level indicated by the liquid level switch II 21b. If yes, set the water tank 116 to the water supply state, set the water tank 1 5 to the ready state, open the two-way valve VII20, close the two-way wide V 18, and proceed to steps 1-3. If not, set the water tank 1 5 to the water supply state, set the water tank 116 to the ready state, open the two-way wide V 18 at the same time, close the two-way valve II20, and return to step 1-2.

Step 1-3: Open the two-way valve VI19 and delay (such as 1^=2 ₅ ) to discharge the compressed air in the water tank 15. The two-way valve 11113 is opened and the injector 14 begins to evacuate the water tank I5. After the delay t ₂ (eg t ₂ = 2 s), the two-way valve I 8 is opened, and the water in the clean water tank 1 starts to flow into the water tank 15 through the suction line under the action of atmospheric pressure until the liquid in the water tank 15 Bit H, closes the two-way valve VI19 after reaching the upper level indicated by the level switch I 21a. After the delay t ₃ (e.g., t ₃ = 0.2s), the two-way valve 11113 is closed, and the injector 14 is stopped. Since the ejector 14 is just closed, the water tank I 5 still has a certain negative pressure, and the water in the clean water tank 1 still flows into the water tank 15 under the action of atmospheric pressure, and consumes the negative pressure in the water tank 15. After the delay t ₄ (eg t ₄ = 2 s), close the two-way valve 18. The water in the suction line stops flowing and proceeds to steps 1-4.

Step 1-4: Determine if the control system receives the stop command. If not, return to step 1-2. If yes, the process ends.

As shown in Figure 3, the specific workflow of the water tank 116 is:

Step 2-1: After the system starts working, it is first determined whether the liquid level H _{2 in the} water tank II 6 reaches the upper liquid level indicated by the liquid level switch 11122a. If yes, proceed to step 2-2. If it is not, it indicates that there is less memory in the water tank 116. When the water tank 15 is waiting for the water supply state, the two-way valve IV15 is opened to discharge the gas in the water tank Π6 until the liquid level H _{2 in the} water tank Π6 reaches the liquid level. After the upper liquid level indicated by the switch 11122a, the process proceeds to step 2-2.

Step 2-2: Determine if the liquid level in tank Π 6 is lower than the medium level indicated by level switch IV22b. If not, open the two-way valve 1111 for water supply and return to 2-2. If yes, then determine if the liquid level in tank II 6 has reached the lower level indicated by level switch V22c. If no, if the water in the water tank 116 is insufficient, close the two-way valve II 11. Suspend the water supply and issue the "water supply low level" alarm, and then proceed to step 2-3. If yes, turn on the 2-way wide II 11 for water supply and proceed to steps 2 - 3.

Step 2-3: Determine whether the water tank I 5 is in the water supply state at this time. If no, go back to step 2-2. If so, the two-way valve IV15 is opened to allow the gas in the water tank 116 to be discharged through the exhaust line, and the water in the water tank I 5 enters the water tank 116 through the intermediate line, and the liquid level in the water tank 116 rises. It is further determined that the liquid level in the water tank 116 is at the middle level indicated by the level switch IV22b. If no, go back to step 2-2. If so, it is judged whether or not the two-way valve II 11 is in the open state. If not, open the two-way valve II 11 and clear the possible "water supply low level" alarm. Go to steps 2-4. If yes, go directly to steps 2 - 4.

Step 2: 4: Determine if the liquid level in the water tank 116 has reached the upper level indicated by the level switch 11122a. If no, go back to step 2-2 and continue to vent. If yes, close the two-way wide IV15 and stop the exhaust. Go to steps 2 - 5.

Step 2-5: Determine if the control system receives the stop command. Otherwise, return to step 2-2. If yes, the process ends.

The liquid level switch I 21a, the liquid level switch II 21b, the liquid level switch III22a, the liquid level switch IV22b, and the liquid level switch V22c all have anti-interference function. When the switch state changes, a certain delay is required (for example, 0.5s). The control action is triggered.

The above description of the invention is not limited to the scope of the present invention, and those skilled in the art should understand that the skilled person does not need to work creatively on the basis of the technical solution of the present invention. Various modifications or variations that can be made are still within the scope of the invention.

Claims

Claim

A train water supply device, comprising: a water purification tank, a water tank I, a water tank II and an ejector, wherein the water tank I is connected to the water purification tank through a water absorption pipeline, and the water tank I passes through the intermediate pipeline and the water tank II Connected, the water tank 连接 is connected to the water appliance through a water supply pipeline, and the upper part of the water tank I is connected to the vacuum port of the ejector through an evacuation pipeline, and the air source interface of the ejector is exhausted through the air supply pipeline and the train The gas source is connected; and the upper part of the water tank I is connected to the train air source through the feed water supply line I, the upper part of the water tank II is connected to the atmosphere through the exhaust line; and the water tank II passes the water supply line II and the train air source The water tank I is provided with a liquid level switch I and a liquid level switch II from top to bottom, and the water tank II is provided with a liquid level switch III, a liquid level switch IV and a liquid level switch V from top to bottom.

2. The train water supply apparatus according to claim 1, wherein the top of the clean water tank is in communication with the atmosphere.

3. The train water supply apparatus according to claim 1, wherein said intermediate line has a check valve I.

4. The train water supply apparatus according to claim 1, wherein said water supply line has a check valve II and a two-way valve II.

5. The train water supply apparatus according to claim 1, wherein the exhaust port of the injector is open to the outside air.

6. The train water supply device according to claim 1, wherein the evacuation line is provided with a two-way valve VI; and the evacuated air supply line is provided with a vacuum filter pressure reducing valve and a two-way valve III.

7. The train water supply device according to claim 1, wherein the feed water supply line I is provided with a two-way valve V and a feed water filter pressure reducing valve; and the feed water supply line II is provided with a two-way valve. Νπ, and the feed water filtration pressure reducing valve is shared with the feed water supply line I.

8. The train water supply device according to claim 1, wherein the water suction pipe is provided with a two-way valve I and a water filter; and the exhaust pipe is provided with a throttle valve and a two-way valve IV.

9. The control method of a train water supply apparatus according to claim 1, comprising a water tank I and a water tank 控制 control method, the characteristics of which are as follows:

The control method of the water tank I is as follows:

Step 1-1: After the system starts working, first determine whether the liquid level in the water tank I reaches the upper liquid level indicated by the liquid level switch I; if the upper liquid level is not reached, the water tank II is set to the water supply state, and the water tank I is set. To prepare the state, simultaneously open the two-way valve νπ, close the two-way valve V, enter step 1-3; if the upper liquid level has been reached, proceed to step 1-2;

Step 1-2: Determine whether the liquid level in the water tank I is lower than the lower liquid level indicated by the liquid level switch II; if yes, set the water tank II to the water supply state, set the water tank I to the ready state, and open the two-way valve Vn at the same time. Close the two-way valve V and go to step 1-3; if not, set the water tank I to the water supply state, set the water tank II to the ready state, open the two-way wide V, close the two-way wide W, and return to step 1- 2;

Step 1-3: Open the two-way wide VI and delay t!, discharge the compressed air in the water tank I; open the two-way valve III, the injector opens Start to vacuum the water tank I; after the delay t ₂ and then open the two-way valve I, the water in the clean water tank begins to flow into the water tank I through the suction line under the action of atmospheric pressure until the liquid level in the water tank I reaches the liquid level The two-way valve VI is closed after the upper liquid level indicated by the switch I; the two-way valve III is closed after the delay t ₃ , the injector stops working; since the injector is just closed; the two-way valve I is closed after the delay t4, the suction line The water in the flow stops flowing, proceed to steps 1-4;

Step 1-4: Determine whether the control system receives the stop command. If not, return to step 1-2. If yes, the process is terminated. The control method of the water tank II is:

Step 2-1: After the system starts working, first judge whether the liquid level in the water tank II reaches the upper liquid level indicated by the liquid level switch III; if yes, proceed to step 2-2; if not, it indicates that the water storage in the water tank II is less. When waiting for the water tank I to be in the water supply state, the two-way valve IV is opened, and the gas in the water tank II is discharged until the liquid level H _{2 in the} water tank II reaches the upper liquid level indicated by the liquid level switch III, and then proceeds to step 2-2. ;

Step 2-1: Determine whether the liquid level in the water tank II is lower than the middle liquid level indicated by the liquid level switch IV; if not, open the two-way valve II for water supply and return to 2-1; if yes, then judge the water tank II Whether the liquid level reaches the lower liquid level indicated by the liquid level switch V; if not, if the water quantity in the water tank II is insufficient, the two-way valve II is closed, the water supply is suspended, and the "water supply device low water level" alarm is issued, and then the steps 2-3 are entered. If yes, open the two-way valve II for water supply, and proceed to step 2-3;

Step 2-3: Determine whether the water tank I is in the water supply state at this time; if not, return to step 2-2; if yes, open the two-way valve IV to discharge the gas in the water tank II through the exhaust line, in the water tank I The water enters the water tank II through the intermediate pipeline, and the liquid level in the water tank II rises; further, it is judged that the liquid level in the water tank II is the medium liquid level indicated by the liquid level switch IV; if not, the process returns to the step 2-2; if yes, Then judge whether the two-way valve II is in the open state; if not, open the two-way valve II and clear the "water supply device low water level" alarm, proceed to step 2-4; if yes, go directly to step 2-4;

Step 2-4: Determine whether the liquid level in the water tank II reaches the upper liquid level indicated by the liquid level switch III; if not, return to step 2-2 to continue the exhaust; if yes, close the two-way valve IV, and the exhaust stop , go to step 2-5;