CN220703303U - Brackish water desalination flash distillation device - Google Patents

Abstract

The utility model provides a brackish water desalination flash evaporation device, which comprises: inlet tube, water pump, flash tank, vacuum pump, heating module, condenser pipe, fresh water bin, liquid level detection module and control module, the inlet tube is connected with the end that intakes, and the water pump sets up on the inlet tube, and the vacuum pump is connected with the flash tank, and heating module is connected with the flash tank, and the fresh water bin passes through the condenser pipe to be connected with the end that intakes, and liquid level detection module sets up in the fresh water bin, and control module is connected with heating module, water pump, vacuum pump and liquid level detection module electricity respectively. The vacuum pump reduces the air pressure of the inner cavity, reduces the boiling point of brackish water, is favorable for reducing the heat required by evaporation of the brackish water, shortens the evaporation time, improves the distillation efficiency, and simultaneously, can automatically start or stop the brackish water desalination treatment process according to the liquid level of the fresh water storage tank through the liquid level detection module and the control module, is favorable for simplifying the operation and enables the use to be more convenient.

Description

Brackish water desalination flash distillation device

Technical Field

The utility model relates to the technical field of brackish water desalination treatment, in particular to a brackish water desalination flash evaporation device.

Background

In inland areas, fresh water resources are relatively lacking due to insufficient precipitation and the like, water sources are generally obtained through well drilling, but the water sources obtained through well drilling are relatively rich in salt, and the water sources belong to brackish water and are not suitable for direct use, so that the brackish water desalination treatment becomes an important means for solving the problem of fresh water resource shortage.

In the prior art, the brackish water is desalted to obtain fresh water in a direct heating distillation mode, but the direct heating distillation mode needs more heat energy and longer heating time, and meanwhile, manual operation is needed to start and stop in the treatment, so that the problems of low heating distillation efficiency and complicated operation for obtaining fresh water are caused.

Disclosure of Invention

The utility model provides a brackish water desalination flash evaporation device which is used for solving the defects of low heating distillation efficiency and complicated operation in the prior art.

The utility model provides a brackish water desalination flash evaporation device, which comprises: the device comprises a water inlet pipe, a water pump, a flash tank, a vacuum pump, a heating module, a condensing pipe, a fresh water storage tank, a liquid level detection module and a control module; the flash tank is provided with an inner cavity, a water inlet end and a steam output end, wherein the water inlet end and the steam output end are communicated with the inner cavity; the water inlet pipe is connected with the water inlet end, and the water pump is arranged on the water inlet pipe; the vacuum pump is connected with the flash tank and is used for reducing the air pressure of the inner cavity; the heating module is connected with the flash tank and is used for increasing the temperature of the inner cavity; the fresh water storage tank is connected with the water inlet end through the condensation pipe; the liquid level detection module is arranged in the fresh water storage tank and is used for detecting the liquid level height in the fresh water storage tank; the control module is respectively and electrically connected with the heating module, the water pump, the vacuum pump and the liquid level detection module, and is used for controlling the water pump, the vacuum pump and the heating module to work according to the liquid level detection module.

The utility model provides a brackish water desalination flash evaporation device, which further comprises a solar power supply module, wherein the solar power supply module is electrically connected with the water pump, the vacuum pump, the heating module and the control module respectively.

According to the brackish water desalination flash evaporation device provided by the utility model, the control module comprises a processor and an electric control switch piece, the processor is respectively and electrically connected with the electric control switch piece and the liquid level detection module, the solar power supply module is electrically connected with the processor, and the solar power supply module is respectively and electrically connected with the water pump, the vacuum pump and the heating module through the electric control switch piece.

According to the brackish water desalination flash evaporation device provided by the utility model, the solar power supply module comprises a photovoltaic panel, a charging circuit, a storage battery and a discharging circuit, wherein the photovoltaic panel is electrically connected with the storage battery through the charging circuit, and the storage battery is respectively electrically connected with the processor and the electric control switch piece.

According to the brackish water desalination flash evaporation device provided by the utility model, the brackish water desalination flash evaporation device further comprises a pressure reducing valve arranged on the water inlet pipe, and the pressure reducing valve is positioned between the water pump and the flash evaporation tank.

According to the brackish water desalination flash evaporation device provided by the utility model, the liquid level detection module comprises the first electrode type liquid level meter and the second electrode type liquid level meter which are both arranged in the fresh water storage tank, the first electrode type liquid level meter and the second electrode type liquid level meter are both electrically connected with the control module, and the first electrode type liquid level meter is positioned above the second electrode type liquid level meter.

According to the brackish water desalination flash evaporation device provided by the utility model, the brackish water desalination flash evaporation device further comprises a salt water storage tank, a drain pipe and a drain valve, wherein the flash evaporation tank is provided with a drain end, the salt water storage tank is connected with the drain end, the drain pipe is connected with the salt water storage tank, and the drain valve is arranged on the drain pipe.

According to the brackish water desalination flash evaporation device provided by the utility model, the fresh water storage tank is provided with the first water taking valve, and the salty water storage tanks are all provided with the second water taking valve.

According to the brackish water desalination flash evaporation device provided by the utility model, the heating module comprises the electric heating tube, and the electric heating tube is connected with the flash evaporation tank and is positioned at the bottom of the inner cavity.

According to the brackish water desalination flash evaporation device provided by the utility model, the brackish water desalination flash evaporation device further comprises a filter element connected with the water inlet pipe, and the filter element is used for filtering water flow flowing to the water pump.

The utility model provides a brackish water desalination flash evaporation device, which has at least the following beneficial effects: the water pump works and runs, the outside brackish water is pumped from the water inlet pipe and flows into the inner cavity of the flash tank, the vacuum pump pumps out the air in the flash tank to reduce the air pressure of the inner cavity, the heating module heats the brackish water in the inner cavity, and the boiling point of the brackish water can be reduced under the low-pressure environment due to the reduction of the air pressure in the inner cavity, so that the brackish water is easier to boil and evaporate, the evaporated steam flows to the condensing pipe through the steam output end, and the steam is liquefied into fresh water to the fresh water storage tank under the condensation effect of the condensing pipe, so that the desalination of the brackish water is realized. Meanwhile, the liquid level detection module is used for detecting the liquid level height in the fresh water storage tank and transmitting a liquid level height signal to the control module, when the fresh water storage capacity is insufficient, the control module controls the water pump, the vacuum pump and the heating module to start to work so as to desalinate brackish water and obtain fresh water, and when the fresh water storage capacity is sufficient, the control module controls the water pump, the vacuum pump and the heating module to stop working so as to realize automatic brackish water desalination treatment. Therefore, the air pressure of the inner cavity is reduced through the vacuum pump, the boiling point of brackish water is reduced, the heat required by evaporation of the brackish water is reduced, the evaporation time is shortened, the distillation efficiency is improved, and meanwhile, the brackish water desalination treatment process can be automatically started or stopped according to the liquid level of the fresh water storage tank through the liquid level detection module and the control module, the operation is simplified, and the use is more convenient.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of one embodiment of a brackish water desalination flash vaporization apparatus;

FIG. 2 is a schematic block diagram of one embodiment of a brackish water desalination flash vaporization apparatus provided by the present utility model.

Reference numerals:

a water inlet pipe 100; a water pump 110; a flash tank 200; a lumen 201; a water inlet end 202; a steam output 203; a vacuum pump 210; a heating module 220; a condensing tube 230; a drain end 204; a fresh water storage tank 300; a first water intake valve 310; a liquid level detection module 400; a first electrode level gauge 410; a second electrode level gauge 420; a control module 500; a processor 510; an electric control switch 520; a solar power module 600; a photovoltaic panel 610; a charging circuit 620; a battery 630; a discharge circuit 640; a pressure reducing valve 700; a brine storage tank 800; a drain pipe 810; a drain valve 820; a second water intake valve 830; a filter 900.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The following describes a brackish water desalination flash evaporation device according to the present utility model with reference to fig. 1 and 2, comprising: a water inlet pipe 100, a water pump 110, a flash tank 200, a vacuum pump 210, a heating module 220, a condensing pipe 230, a fresh water storage tank 300, a liquid level detection module 400 and a control module 500; the flash tank 200 is provided with an inner cavity 201, a water inlet end 202 and a steam output end 203 which are communicated with the inner cavity 201; the water inlet pipe 100 is connected with the water inlet end 202, and the water pump 110 is arranged on the water inlet pipe 100; the vacuum pump 210 is connected with the flash tank 200, and the vacuum pump 210 is used for reducing the air pressure of the inner cavity 201; the heating module 220 is connected with the flash tank 200, and the heating module 220 is used for increasing the temperature of the inner cavity 201; the fresh water storage tank 300 is connected with the water inlet end 202 through the condensation pipe 230; the liquid level detection module 400 is disposed in the fresh water storage tank 300, and the liquid level detection module 400 is used for detecting the liquid level in the fresh water storage tank 300; the control module 500 is electrically connected to the heating module 220, the water pump 110, the vacuum pump 210 and the liquid level detection module 400, respectively, and the control module 500 is configured to control the water pump 110, the vacuum pump 210 and the heating module 220 to operate according to the liquid level detection module 400.

The water pump 110 operates to pump the external brackish water from the water inlet pipe 100 into the inner cavity 201 of the flash tank 200, the vacuum pump 210 pumps the air in the flash tank 200 to reduce the air pressure in the inner cavity 201, the heating module 220 heats the brackish water in the inner cavity 201, and the boiling point of the brackish water is reduced in a low-pressure environment due to the reduction of the air pressure in the inner cavity 201, so that the brackish water is easier to boil and evaporate, the evaporated steam flows to the condensing pipe 230 through the steam output end 203, and the steam is liquefied into fresh water to the fresh water storage tank 300 under the condensation action of the condensing pipe 230, so that the desalination of the brackish water is realized. Meanwhile, the liquid level in the fresh water storage tank 300 is detected by the liquid level detection module 400, a liquid level signal is transmitted to the control module 500, when the fresh water storage capacity is insufficient, the control module 500 controls the water pump 110, the vacuum pump 210 and the heating module 220 to start to work so as to desalinate brackish water to obtain fresh water, and when the fresh water storage capacity is sufficient, the water pump 110, the vacuum pump 210 and the heating module 220 are controlled to stop working, so that the automatic brackish water desalination treatment is realized. In this way, the vacuum pump 210 reduces the air pressure in the inner cavity 201, reduces the boiling point of brackish water, is favorable for reducing the heat required by evaporation of brackish water, shortens the evaporation time, improves the distillation efficiency, and simultaneously, can automatically start or stop the brackish water desalination process according to the liquid level of the fresh water storage tank 300 through the liquid level detection module 400 and the control module 500, is favorable for simplifying the operation and makes the use more convenient.

Referring to fig. 1 and 2, in some embodiments of the present utility model, a solar power module 600 is further included, and the solar power module 600 is electrically connected to the water pump 110, the vacuum pump 210, the heating module 220, and the control module 500, respectively.

In inland areas such as northwest areas of China, the solar energy power supply module 600 is arranged, the solar energy power supply module 600 converts solar energy into electric energy, and the electric energy is used for supplying power to the water pump 110, the vacuum pump 210, the heating module 220 and the control module 500, so that the environmental light energy resources can be fully utilized, and the electric energy of the commercial power can be saved.

Referring to fig. 1 and 2, in some embodiments of the present utility model, the control module 500 includes a processor 510 and an electric control switch 520, the processor 510 is electrically connected to the electric control switch 520 and the liquid level detection module 400, respectively, the solar power module 600 is electrically connected to the processor 510, and the solar power module 600 is electrically connected to the water pump 110, the vacuum pump 210, and the heating module 220 through the electric control switch 520, respectively.

The processor 510 generates an output control signal according to the liquid level height signal obtained from the liquid level detection module 400 to control the on or off of the electric control switch 520, so as to control whether the heating module 220, the water pump 110 and the vacuum pump 210 are powered on or not, thereby achieving the effect of controlling the starting or stopping of the heating module 220, the water pump 110 and the vacuum pump 210. Thus, the water pump 110, the vacuum pump 210 and the heating module 220 are controlled to work, and the device is simple in structure and convenient to implement.

Processor 510 may be an embodiment of a device including a single chip, embedded chip, or the like. The electric control switch 520 may be an embodiment of a switching device including a plurality of relays, a plurality of power switching tube modules, etc. capable of implementing a switching control function, so as to be capable of individually controlling the heating module 220, the water pump 110, and the vacuum pump 210, respectively; in some embodiments, the electrically controlled switch 520 may also be a switch device implementation including a single relay, a power switch tube module, and the like, and the heating module 220, the water pump 110, and the vacuum pump 210 are controlled to start and stop by the single switch device.

In some embodiments of the present utility model, the control module 500 may further include a schmitt trigger and a relay, where an input end of the schmitt trigger is connected to the liquid level detection module, when an output voltage of the liquid level detection module is greater than a first voltage threshold of the schmitt trigger, and a liquid level of the corresponding fresh water storage tank 300 is greater than an upper limit threshold, the schmitt trigger drives the relay to be opened, the water pump 110, the vacuum pump 210 and the heating module 220 stop working, and when an output voltage of the liquid level detection module is less than a second voltage threshold of the schmitt trigger, and a liquid level of the corresponding fresh water storage tank 300 is less than a lower limit value, the schmitt trigger drives the relay to be closed to be turned on, so that the water pump 110, the vacuum pump 210 and the heating module 220 start working. In this way, the operation of the water pump 110, the vacuum pump 210 and the heating module 220 is controlled according to the liquid level height by utilizing the characteristics of the two trigger potentials of the schmitt trigger. The control module 500 may also be other embodiments that implement control functions by hardware circuitry.

In some embodiments of the present utility model, the control module 500 may control the water pump 110 and the vacuum pump 210 to operate first to ensure that brackish water is stored in the inner chamber 201, and the air pressure of the inner chamber 201 is in a proper range, and then control the heating module 220 to operate.

In some embodiments of the present utility model, the control module 500 further comprises a barometric pressure sensor disposed in the lumen 201, and the barometric pressure sensor is electrically connected to the control module. The air pressure sensor detects the air pressure in the inner cavity 201, and the control module 500 obtains the current air pressure value of the inner cavity 201 through the air pressure sensor and then controls the vacuum pump 210 to intermittently operate so as to maintain the air pressure value within a preset range. It should be noted that, when the fresh water storage capacity is sufficient, that is, the liquid level is greater than the preset upper limit value, the vacuum pump 210 stops working, and the air pressure value is not required to be maintained.

Referring to fig. 1 and 2, in some embodiments of the present utility model, the solar power module 600 includes a photovoltaic panel 610, a charging circuit 620, a storage battery 630, and a discharging circuit 640, wherein the photovoltaic panel 610 is electrically connected to the storage battery 630 through the charging circuit 620, and the storage battery 630 is electrically connected to the processor 510 and the electronic control switch 520, respectively.

The photovoltaic panel 610 is irradiated by sunlight to generate photovoltaic voltage, the photovoltaic voltage is converted into charging voltage suitable for charging the storage battery 630 through the charging circuit 620, so as to charge the storage battery 630, the effect of converting solar energy into electric energy for storage is achieved, the storage battery 630 releases electric energy through the discharging circuit 640 to supply power to the processor 510, and meanwhile, the storage battery 630 can supply power to the water pump 110, the vacuum pump 210 and the heating module 220 through the electric control switch element 520. The solar energy power supply device is simple in structure and convenient to implement.

Referring to fig. 1, in some embodiments of the utility model, a pressure reducing valve 700 is further included on the water inlet pipe 100, the pressure reducing valve 700 being located between the water pump 110 and the flash tank 200.

By arranging the pressure reducing valve 700 between the water pump 110 and the flash tank 200, the pressure reducing valve 700 can reduce the water inlet pressure, so that the water flow flowing into the flash tank 200 has reasonable pressure, and the pressure reducing valve is adapted to the low-pressure environment formed by the vacuum pump 210, so that the pressure difference is prevented from being too large, the flash tank 200 is protected, and the reliability and the safety are improved.

Referring to fig. 1 and 2, in some embodiments of the present utility model, the liquid level detection module 400 includes a first electrode type liquid level meter 410 and a second electrode type liquid level meter 420 both disposed in the fresh water storage tank 300, wherein the first electrode type liquid level meter 410 and the second electrode type liquid level meter are electrically connected to the control module 500, and the first electrode type liquid level meter 410 is located above the second electrode type liquid level meter 420.

When the liquid in the fresh water storage tank 300, i.e. fresh water, contacts the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420, the fresh water acts as a conductor to enable the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420 to form a loop to generate an electric signal and transmit the electric signal to the control module 500, i.e. the processor 510, and accordingly, the processor 510 can know the current liquid level height range according to whether the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420 generate the electric signal or not. Therefore, the effect of detecting the liquid level in the fresh water storage tank 300 is achieved by using the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420, the structure is simple, and meanwhile, the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420 do not need to be independently powered, and can directly work by directly using the pin voltage of the processor 510, so that the use and implementation are convenient.

The first electrode type liquid level meter 410 is located above the second electrode type liquid level meter 420, the first electrode type liquid level meter 410 detects the upper limit of the liquid level height, the second electrode type liquid level meter 420 detects the lower limit of the liquid level height, the installation positions of the first electrode type liquid level meter 410 and the second electrode type liquid level meter 420 can be set according to specific requirements, so as to set the lower limit of the liquid level height for triggering and starting the brackish water desalination treatment and the upper limit of the liquid level height for triggering and stopping the brackish water desalination treatment.

When the second electrode level gauge 420 does not generate an electrical signal, i.e. fresh water is not in contact with the second electrode level gauge 420, the processor 510 makes the electric control switch 520 closed and conducted, so as to enable the water pump 110, the vacuum pump 210 and the heating module 220 to be powered on; when the first electrode level meter 410 generates an electrical signal, i.e. fresh water contacts the first electrode level meter 410, the processor 510 turns off the electric control switch 520, so that the water pump 110, the vacuum pump 210 and the heating module 220 are powered down to stop working.

Referring to fig. 1, in some embodiments of the present utility model, a brine storage tank 800, a drain pipe 810, and a drain valve 820 are further included, the flash tank 200 is provided with a drain end 204, the brine storage tank 800 is connected to the drain end 204, the drain pipe 810 is connected to the brine storage tank 800, and the drain valve 820 is disposed on the drain pipe 810.

Because the brackish water in the flash tank 200 is heated, boiled and evaporated, the salt concentration in the remaining liquid rises to form salt water, if the salt water is continuously evaporated, salt may be precipitated at the bottom of the flash tank 200 to form salt stratification, which may damage the structure of the flash tank 200, and may affect the heating efficiency of the heating module 220, and meanwhile, the efficiency of evaporating and desalting the salt water with high concentration is low. Therefore, the brine flows into the brine storage tank 800 through the water discharge end 204, so that the brine can be conveniently utilized, the water discharge valve 820 can be opened, the brine can be discharged, and the brine can be discharged back into the pumped water well, so that the circulation of the water and the salt is realized. With this structure, the brine produced in the flash tank 200 during the brackish water desalination process can be discharged, which is convenient for the utilization or discharge of the brine for circulation, and is beneficial to maintaining the stable and reliable operation of the flash tank 200 and improving the evaporation desalination efficiency.

Referring to fig. 1, in some embodiments of the present utility model, the fresh water storage tanks 300 are provided with first water intake valves 310, and the salt water storage tanks 800 are each provided with a second water intake valve 830.

Through being provided with first water valve 310 at fresh water storage tank 300, salt water storage tank 800 all is provided with second water valve 830, can be through opening the fresh water in the fresh water storage tank 300 of first water valve 310 access, open the salt water in the salt water storage tank 800 of second water valve 830 access, make to use more convenient.

Referring to fig. 1, in some embodiments of the utility model, the heating module 220 comprises an electrical heating tube connected to the flash tank 200 and located at the bottom of the interior cavity 201.

The electrothermal tube is connected with the flash tank 200 and is positioned at the bottom of the inner cavity 201, and the electrothermal tube is directly contacted with liquid in the flash tank 200, so that the heating efficiency is improved, and meanwhile, the efficiency of converting electric energy into heat energy is improved. Therefore, the heating module 220 adopts an electric heating tube, so that the heating efficiency is high, and the structure is simple and convenient to use and implement.

Referring to fig. 1, in some embodiments of the present utility model, a filter 900 is further included in connection with the water inlet pipe 100, the filter 900 being used to filter the water flowing toward the water pump 110.

The filter 900 is connected with the water inlet pipe 100 to filter water flowing into the water inlet pipe 100, so that substances such as sediment in brackish water can be prevented from entering the water pump 110, normal operation of the water pump 110 is maintained, and the service life of the whole device is prolonged.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A brackish water desalination flash distillation apparatus, comprising: a water inlet pipe (100), a water pump (110), a flash tank (200), a vacuum pump (210), a heating module (220), a condensing pipe (230), a fresh water storage tank (300), a liquid level detection module (400) and a control module (500);

the flash tank (200) is provided with an inner cavity (201), and a water inlet end (202) and a steam output end (203) which are communicated with the inner cavity (201);

the water inlet pipe (100) is connected with the water inlet end (202), and the water pump (110) is arranged on the water inlet pipe (100);

the vacuum pump (210) is connected with the flash tank (200), and the vacuum pump (210) is used for reducing the air pressure of the inner cavity (201);

the heating module (220) is connected with the flash tank (200), and the heating module (220) is used for increasing the temperature of the inner cavity (201);

the fresh water storage tank (300) is connected with the water inlet end (202) through the condensation pipe (230);

the liquid level detection module (400) is arranged in the fresh water storage tank (300), and the liquid level detection module (400) is used for detecting the liquid level height in the fresh water storage tank (300);

the control module (500) is electrically connected with the heating module (220), the water pump (110), the vacuum pump (210) and the liquid level detection module (400) respectively, and the control module (500) is used for controlling the water pump (110), the vacuum pump (210) and the heating module (220) to work according to the liquid level detection module (400).

2. A brackish water desalination flash device according to claim 1, wherein: the solar energy power supply system further comprises a solar energy power supply module (600), wherein the solar energy power supply module (600) is electrically connected with the water pump (110), the vacuum pump (210), the heating module (220) and the control module (500) respectively.

3. A brackish water desalination flash device according to claim 2, wherein: the control module (500) comprises a processor (510) and an electric control switch piece (520), the processor (510) is respectively electrically connected with the electric control switch piece (520) and the liquid level detection module (400), the solar power supply module (600) is electrically connected with the processor (510), and the solar power supply module (600) is respectively electrically connected with the water pump (110), the vacuum pump (210) and the heating module (220) through the electric control switch piece (520).

4. A brackish water desalination flash device according to claim 3, wherein: the solar power supply module (600) comprises a photovoltaic panel (610), a charging circuit (620), a storage battery (630) and a discharging circuit (640), wherein the photovoltaic panel (610) is electrically connected with the storage battery (630) through the charging circuit (620), and the storage battery (630) is electrically connected with the processor (510) and the electric control switch piece (520) respectively.

5. A brackish water desalination flash device according to claim 1, wherein: the flash tank further comprises a pressure reducing valve (700) arranged on the water inlet pipe (100), and the pressure reducing valve (700) is positioned between the water pump (110) and the flash tank (200).

6. A brackish water desalination flash device according to claim 1, wherein: the liquid level detection module (400) comprises a first electrode type liquid level meter (410) and a second electrode type liquid level meter (420), wherein the first electrode type liquid level meter (410) and the second electrode type liquid level meter are both arranged in the fresh water storage tank (300) and are electrically connected with the control module (500), and the first electrode type liquid level meter (410) is located above the second electrode type liquid level meter (420).

7. A brackish water desalination flash device according to claim 1, wherein: still include salt water bin (800), drain pipe (810) and drain valve (820), flash tank (200) are provided with drainage end (204), salt water bin (800) with drainage end (204) are connected, drain pipe (810) with salt water bin (800) are connected, drain valve (820) set up in on drain pipe (810).

8. A brackish water desalination flash device according to claim 7, wherein: the fresh water storage tank (300) is provided with a first water taking valve (310), and the salty water storage tanks (800) are all provided with a second water taking valve (830).

9. A brackish water desalination flash device according to claim 1, wherein: the heating module (220) comprises an electrical heating tube connected with the flash tank (200) and located at the bottom of the inner cavity (201).

10. A brackish water desalination flash device according to claim 1, wherein: and a filter (900) connected with the water inlet pipe (100), wherein the filter (900) is used for filtering water flowing to the water pump (110).