An electric heating multi-effect distilled water machine

Abstract

The present invention relates to the technical field of distillers, in particular to an electric heating multi-effect distilled water machine, which comprises a water supply system, a double-effect condenser, a multi-stage evaporator assembly, an electric heating evaporator, and a liquid heat exchanger. Each stage of the evaporator assembly includes: an effect evaporator and a preheating heat exchanger. In the present invention, by adding a liquid heat exchanger and improving the structure of the effect evaporator, the full utilization of heat is achieved, and the purpose of energy saving is realized. Moreover, the steam generated by the effect evaporator accumulates gradually, so that the steam generation amount can be maximally increased, making the electric heating multi-effect distilled water machine have the advantages of high efficiency and energy saving.

Description

Technical Field

[0001] The present invention relates to the technical field of distillers, and in particular to an electric heating multi-effect distilled water machine. Background Art

[0002] The water treated by a distiller is distilled water, which can be used for medical "injection water", experimental water, and situations with relatively high hygiene requirements, and there is a demand for use in some fields. The most common distillation method is to directly heat water in a container, generate gasification on the liquid surface, and produce distilled water after condensation. However, when water is contained in the container, its evaporation surface is limited by the cross-sectional area of the container and is difficult to set large, the efficiency of steam generation is relatively low, and continuous heating is required during the evaporation process; generally speaking, the thermal utilization rate is low and the efficiency of producing distilled water is low.

[0003] Most of the current commercially available distilled water machines are electric multi-effect distilled water machines. When the applicant applied for the present invention, after retrieval, it was found that a Chinese patent disclosed an "electric multi-effect distilled water machine" with an application number of "200510054648.8". This patent mainly consists of a purified water inlet metering device (61), a condenser (37), an effect evaporator (1), and an electric evaporator (29) including an electric heating tube, an infrared radiation belt, an electromagnetic heating device, a microwave generator, etc., which are connected in sequence. The electric evaporator (29) is used as the first effect evaporator and has the characteristics of saving water, saving electricity, and adding one effect for equipment of the same scale. It can be widely used in pharmaceutical factories, hospitals, scientific research and other departments without boilers and is an ideal device for producing distilled water. In this technology, the water in the last-stage evaporator is directly discharged, which will cause heat waste, and the thermal efficiency of the adopted evaporator is not high enough. Therefore, the present invention provides a more efficient electric heating multi-effect distilled water machine. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose an electric heating multi-effect distilled water machine.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An electric heating multi-effect distiller includes a water supply system, a double-effect condenser, a multi-stage evaporator assembly, and an electric heating evaporator. Each stage of the multi-stage evaporator assembly includes: an effect evaporator and a preheating heat exchanger. The effect evaporator includes a housing, and a one-way overflow structure is fixedly connected inside the housing, dividing the interior of the housing into an upper evaporation area and a lower water-carrying area. A central pipe is fixedly connected inside the housing. The top end of the central pipe is fixedly connected with an equalizing plate near the inner top of the housing. A plurality of liquid outlets are arranged on the side of the equalizing plate. The bottom end of the central pipe extends to the outside of the housing. A water droplet collection film is fixedly connected to the inner side wall of the upper evaporation area. Second steam inlet and outlet interfaces are arranged on the side of the housing, and both the second steam inlet and outlet interfaces communicate with the upper evaporation area. A first hot water outlet interface is fixedly connected to the bottom of the housing, and the first hot water outlet interface communicates with the lower water-carrying area;

[0006] It further includes: a liquid heat exchanger. An automatic pump body is installed in the water supply system. The water outlet end of the water supply system is connected to the cold water inlet end of the liquid heat exchanger. The preheated water discharge end of the liquid heat exchanger is connected to the cold water inlet end of the double-effect condenser. The secondary preheated water discharge end of the double-effect condenser is connected to the cold water inlet end of the preheating heat exchanger. The water to be preheated passes through the preheating heat exchangers of each stage of the evaporator assembly in sequence, from the preheating heat exchanger of the Nth stage of the evaporator assembly to the preheating heat exchanger of the first stage of the evaporator assembly. The Nth preheated water discharge end of the first-stage preheating heat exchanger is connected to the water inlet of the electric heating evaporator. The electric heating evaporator has a critical temperature hot water outlet and a steam outlet. Among them, the steam outlet of the electric heating evaporator is connected to the second steam inlet interface through a second steam inlet pipeline. The second steam outlet interface is connected to the steam inlet of the preheating heat exchanger through a first steam outlet pipeline. At the same time, the second steam outlet interface is connected to the second steam inlet interface of the effect evaporator of the next-stage evaporator assembly through a second steam outlet pipeline. The steam discharge outlet of the preheating heat exchanger is connected to the steam inlet of the preheating heat exchanger of the next-stage evaporator assembly. The critical temperature hot water outlet of the electric heating evaporator is connected to the bottom end of the central pipe through a first hot water inlet pipeline. The first hot water outlet interface is connected to the second steam inlet interface of the effect evaporator of the effect evaporator of the next-stage evaporator assembly through a first hot water outlet pipeline;

[0007] The first hot water outlet interface of the effect evaporator of the last-stage evaporator assembly is connected to the hot water inlet end of the liquid heat exchanger. The cold water discharge end of the liquid heat exchanger is connected to a drainage pipeline. The steam discharge outlet of the preheating heat exchanger of the effect evaporator of the last-stage evaporator assembly is connected to the steam inlet of the double-effect condenser. The condensate outlet of the double-effect condenser is the distilled water outlet.

[0008] Further:

[0009] The one-way overflow structure includes: a fixed disk and a floating plate. The fixed disk is fixedly connected to the inner wall of the housing. At least two guiding holes are formed in the fixed disk. The floating plate can cover all the guiding holes. A guiding cylinder is fixedly connected to the bottom of the floating plate. The guiding cylinder is located inside the guiding hole, and the number of guiding cylinders is less than the number of guiding holes.

[0010] Further:

[0011] An umbrella-shaped guiding plate is fixedly connected inside the housing through a connecting member. The umbrella-shaped guiding plate is located below the equalizing disk.

[0012] Further:

[0013] The distilled water outlet has a first distilled water outlet end and a second distilled water outlet end arranged in parallel. A second solenoid valve is installed on the first distilled water outlet end. A third solenoid valve is installed on the second distilled water outlet end. A control valve is arranged on the water supply path between the liquid heat exchanger and the double-effect condenser. The control valve includes a normally closed valve and a first solenoid valve. The normally closed valve and the first solenoid valve are connected through a parallel pipeline;

[0014] It further includes: a control component and a temperature detection component. The first solenoid valve, the second solenoid valve, the third solenoid valve, and the temperature detection component are all electrically connected to the control component;

[0015] The control mode of the control component is: when the second solenoid valve and the third solenoid valve are both closed, the first solenoid valve is closed; when at least one of the second solenoid valve and the third solenoid valve is opened, the first solenoid valve is opened.

[0016] Further:

[0017] A sampling port is arranged at the distilled water outlet. The sampling port is located behind the second solenoid valve and the third solenoid valve. [[ID=3)]

[0018] Further:

[0019] The automatic pump body has a water level detection component. The water level detection component is used to monitor the water level inside the electric heating evaporator and transmit the monitoring data to the control end of the automatic pump body.

[0020] Further:

[0021] The multi-stage evaporator assembly is a five-stage evaporator assembly.

[0022] Further:

[0023] An exhaust branch pipe is connected to the condensate outlet of the double-effect condenser. A breather is installed on the exhaust branch pipe.

[0024] The present invention has the following beneficial effects:

[0025] 1. Compared with the prior art, for this electric heating multi-effect distiller, by adding a liquid heat exchanger and improving the structure of the effect evaporator, the full utilization of heat is realized, achieving the purpose of energy conservation. Moreover, the steam generated by the effect evaporator accumulates gradually, thereby being able to maximize the steam generation amount, making the electric heating multi-effect distiller have the advantages of high efficiency and energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall schematic diagram of the present invention;

[0027] Figure 2 is the schematic diagram of one-stage evaporator assembly of the present invention;

[0028] Figure 3 is the schematic diagram of the distilled water outlet system principle of the present invention;

[0029] Figure 4 is the internal schematic diagram of the evaporator of the present invention;

[0030] Figure 5 is Figure 4 the partial enlarged view at A in

[0031] Figure 6 is the schematic diagram of the one-way water overflow structure of the present invention.

[0032] Legend Explanation:

[0033] 1. Water supply system; 2. Automatic pump body; 3. Water level detection component; 4. Liquid heat exchanger; 5. Control valve; 51. Normally closed valve; 52. First solenoid valve; 6. Double-effect condenser; 7. Multi-stage evaporator assembly; 71. Effect evaporator; 72. Preheating heat exchanger; 73. First liquid inflow pipeline; 74. First liquid outflow pipeline; 75. First steam inflow pipeline; 76. First steam outflow pipeline; 77. Second steam inflow pipeline; 78. First hot water inflow pipeline; 79. First hot water outflow pipeline; 710. Second steam outflow pipeline; 8. Electric heating evaporator; 9. Sampling port; 10. First distilled water outlet end; 101. Second solenoid valve; 11. Second distilled water outlet end; 111. Third solenoid valve; 12. Temperature detection component; 13. Control component; 14. Shell; 15. Central pipeline; 16. Equalizing plate; 17. Liquid outlet; 18. Umbrella-shaped guide plate; 19. Connecting piece; 20. Water droplet collecting film; 21. Second steam inflow interface; 22. Second steam outflow interface; 23. One-way water overflow structure; 231. Fixed plate; 232. Guide hole; 233. Floating plate; 234. Guide column body; 24. First hot water outflow interface. DETAILED DESCRIPTION OF THE INVENTION

[0034] Reference Figures 1 - 6 , a multi-effect electric heating distiller provided by the present invention includes a water supply system 1, a double-effect condenser 6, a multi-stage evaporator assembly 7, an electric heating evaporator 8, and a liquid heat exchanger 4. Each stage of the evaporator assembly includes: an effect evaporator 71 and a preheating heat exchanger 72.

[0035] An automatic pump body 2 is installed in the water supply system 1. When the automatic pump body 2 works, water is pumped into the water supply system 1. The water outlet end of the water supply system 1 is connected to the cold water inlet end of the liquid heat exchanger 4, that is, the cold water coming out of the water supply system 1 enters the liquid heat exchanger 4 for partial preheating. The purpose of this is to improve the heat utilization rate and save energy. The preheated water discharge end of the liquid heat exchanger 4 is connected to the cold water inlet end of the double-effect condenser 6. The water preheated for the first time enters the double-effect condenser 6 for secondary preheating. The secondary preheated water discharge end of the double-effect condenser 6 is connected to the cold water inlet end of the preheating heat exchanger. There are N preheating heat exchangers 72, and the water inlets and outlets of two adjacent preheating heat exchangers 72 are connected in series, as shown in Figure 1 , 2 shown. Figure 2 Shown is the preheating heat exchanger of one stage of the evaporator assembly, which is connected with a first liquid inflow pipeline 73 and a first liquid outflow pipeline 74. The first liquid inflow pipeline 73 of the preheating heat exchanger of the Nth stage of the evaporator assembly is connected to the secondary preheated water discharge end of the double-effect condenser 6, and the first liquid outflow pipeline 74 of the preheating heat exchanger of the first stage of the evaporator assembly is connected to the electric heating evaporator 8. The water preheated twice by the double-effect condenser 6 will pass through the preheating heat exchangers of the Nth stage of the evaporator assembly - up to the preheating heat exchanger of the first stage of the evaporator assembly in sequence. After multiple preheatings, it reaches the electric heating evaporator 8, and is electrically heated inside the electric heating evaporator 8 to make the liquid inside boil, and the liquid is in the critical state of boiling, and the steam temperature is about 162 °C.

[0036] Among them, the effective evaporator 71 includes a housing 14, and a one-way water overflow structure 23 is fixedly connected inside the housing 14. The one-way water overflow structure 23 divides the interior of the housing 14 into an upper evaporation area and a lower water-carrying area. The liquid generated in the upper evaporation area will flow back to the lower water-carrying area. A central pipe 15 is fixedly connected inside the housing 14. The top end of the central pipe 15 and near the inner top of the housing 14 is fixedly connected with an equalizing plate 16. A number of liquid outlets 17 are arranged on the side of the equalizing plate 16. The bottom end of the central pipe 15 extends to the outside of the housing 14. The inner side wall of the upper evaporation area is fixedly connected with a water droplet collection film 20. On the side of the housing 14 are a second steam inlet interface 21 and a second steam outlet interface 22, and both the second steam inlet interface 21 and the second steam outlet interface 22 communicate with the upper evaporation area. The bottom of the housing 14 is fixedly connected with a first hot water outlet interface 24, and the first hot water outlet interface 24 communicates with the lower water-carrying area.

[0037] The electric heating evaporator 8 has a critical temperature hot water outlet and a steam outlet. Among them, a second steam inlet pipeline 77 is connected between the steam outlet of the electric heating evaporator 8 and the second steam inlet interface 21 (here referring to the second steam inlet interface 21 of the first-stage evaporator assembly). The high-temperature steam generated by the electric heating evaporator 8 enters the upper evaporation area through the second steam inlet pipeline 77. The second steam outlet interface 22 is connected to the steam inlet of the preheating heat exchanger 72 through a first steam outlet pipeline 76, driving the steam into the preheating heat exchanger 72 (here referring to the pipeline for external steam flow). At the same time, the second steam outlet interface 22 is connected to the second steam inlet interface of the effective evaporator of the next-stage evaporator assembly through a second steam outlet pipeline 710. The steam discharge outlet of the preheating heat exchanger 72 is connected to the steam inlet of the preheating heat exchanger of the next-stage evaporator assembly. The critical temperature hot water outlet of the electric heating evaporator 8 is connected to the bottom end of the central pipe 15 through a first hot water inlet pipeline 78. The first hot water outlet interface 24 is connected to the second steam inlet interface of the effective evaporator of the effective evaporator of the next-stage evaporator assembly through a first hot water outlet pipeline 79.

[0038] The critical temperature hot water inside the electric heating evaporator 8 enters the central pipe 15 through the first hot water inlet pipe 78, and then reaches the equalizing plate 16 at the top of the central pipe 15. It is sprayed from the liquid outlet 16 on the side of the equalizing plate 16 onto the water droplet collecting film 20, forming a water film on the water droplet collecting film 20. The high-temperature steam introduced at the second steam inlet interface 21 contacts the water film on the water droplet collecting film 20 and heats it. Since the heating area is relatively large, the depth of the liquid (here referring to the thickness of the water film) is relatively small, and the water temperature is at the critical boiling state, the water film on the water droplet collecting film 20 can be quickly vaporized to form steam. This part of the steam will be mixed with the high-temperature steam introduced at the second steam inlet interface 21. Part of it enters the preheating heat exchanger 72 through the first steam outlet pipe and flows in the direction of multiple preheating heat exchangers 72. The other part flows into the next-stage effect evaporator 71 through the second steam outlet pipe 710. At the same time, the excess high-temperature liquid sprayed from the equalizing plate 16 will flow back to the lower water-carrying area through the one-way water overflow structure 23. Since the volume in the lower water-carrying area is in a fixed state, when the water volume increases, an "inter-effect pressure difference" will be formed, and the high-temperature water will flow into the next-stage effect evaporator 71 through the first hot water outlet pipe 79. The principle occurring in the next-stage evaporator assembly is the same as the above analysis.

[0039] The first hot water outlet interface of the effect evaporator of the last-stage evaporator assembly is connected to the hot water inlet end of the liquid heat exchanger 4. The cold water discharge end of the liquid heat exchanger 4 is connected to the drainage pipe. The hot water enters the liquid heat exchanger 4 and is finally discharged, constituting the first preheating with the water supply of the above-mentioned water supply system 1.

[0040] The steam discharge outlet of the preheating heat exchanger of the effect evaporator of the last-stage evaporator assembly is connected to the steam inlet of the double-effect condenser 6, and exchanges heat with the water passing through the double-effect condenser 6 to realize the condensation of the steam and the second preheating of the passing water. The condensate outlet of the double-effect condenser 6 is the distilled water outlet.

[0041] In one embodiment, the one-way water overflow structure 23 includes: a fixed plate 231 and a floating plate 233. The fixed plate 231 is fixedly connected to the inner wall of the housing 14. At least two guiding holes 232 are formed on the fixed plate 231. The floating plate 233 can cover all the guiding holes 232. A guiding column 234 is fixedly connected to the bottom of the floating plate 233. The guiding column 234 is located inside the guiding hole 232, and the number of guiding columns 234 is less than the number of guiding holes 232.

[0042] When water accumulates above the fixed plate 231, the floating plate 233 will float up. The guiding holes 232 without inserted guiding columns 234 serve as water guiding channels to realize the flow of liquid from the upper evaporation area to the lower water-carrying area.

[0043] Inside the housing 14, an umbrella-shaped guide plate 18 is fixedly connected through a connecting member 19. The umbrella-shaped guide plate 18 is located below the equalizing plate 16. The umbrella-shaped guide plate 18 and the equalizing plate 16 cooperate to make the discharged water all hit on the water droplet collection film 20. The water droplet collection film 20 is cylindrical, and its inner surface is non-smooth, enabling water droplets to disperse and gather on it.

[0044] The distilled water outlet has a first distilled water outlet end 10 and a second distilled water outlet end 11 arranged in parallel. A second solenoid valve 101 is installed on the first distilled water outlet end 10, and a third solenoid valve 111 is installed on the second distilled water outlet end 11. A control valve 5 is arranged on the water supply path between the liquid heat exchanger 4 and the double-effect condenser 6. The control valve 5 includes a normally closed valve 51 and a first solenoid valve 52, and the normally closed valve 51 and the first solenoid valve 52 are connected by a parallel pipeline.

[0045] It further includes: a control component 13 and a temperature detection component 12. The first solenoid valve 52, the second solenoid valve 101, the third solenoid valve 111, and the temperature detection component 12 are all electrically connected to the control component 13. The control mode of the control component 13 is: when the second solenoid valve 101 and the third solenoid valve 111 are both closed, the first solenoid valve 52 is closed; when at least one of the second solenoid valve 101 and the third solenoid valve 111 is open, the first solenoid valve 52 is open.

[0046] When using distilled water, the first solenoid valve 52 is opened. At this time, if the automatic pump body 2 is also in the working state, water can be supplied to the system.

[0047] A sampling port 9 is provided at the distilled water outlet. The sampling port 9 is located behind the second solenoid valve 101 and the third solenoid valve 111. The front and rear directions are based on the direction of water flow, that is, the one that water flows through first is the rear, and the one that water flows through later is the front. The user can take water for inspection at the sampling port 9 and then select two outlet ends to discharge water. One is used to discharge qualified distilled water, and the other is used to discharge unqualified distilled water.

[0048] The automatic pump body 2 has a water level detection component 3. The water level detection component 3 is used to monitor the water level inside the electric heating evaporator 8 and transmit the monitoring data to the control end of the automatic pump body 2.

[0049] Preferably, the multi-stage evaporator assembly 7 is a five-stage evaporator assembly.

[0050] An exhaust branch pipe is connected to the condensate outlet of the double-effect condenser 6. A breather is installed on the exhaust branch pipe. The breather allows air to pass through but does not allow liquid to pass through, and is used to discharge some non-condensable gases.

[0051] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric heating multi-effect distilled water machine, comprising a water supply system (1), a double-effect condenser (6), a multi-stage evaporator assembly (7), and an electric heating evaporator (8), characterized in that, Each stage of the multi-stage evaporator assembly (7) includes: an effect evaporator (71) and a preheating heat exchanger (72). The effect evaporator (71) includes a housing (14). Inside the housing (14), a unidirectional water overflow structure (23) is fixedly connected, dividing the interior of the housing (14) into an upper evaporation area and a lower water-carrying area. Inside the housing (14), a central pipe (15) is fixedly connected. At the top of the central pipe (15) and near the inner top of the housing (14), an equalizing plate (16) is fixedly connected. A plurality of liquid outlets (17) are arranged on the side of the equalizing plate (16). The bottom end of the central pipe (15) extends outside the housing (14). The inner side wall of the upper evaporation area is fixedly connected with a water droplet collection film (20). On the side of the housing (14) are a second steam inlet interface (21) and a second steam outlet interface (22), and both the second steam inlet interface (21) and the second steam outlet interface (22) communicate with the upper evaporation area. At the bottom of the housing (14), a first hot water outlet interface (24) is fixedly connected, and the first hot water outlet interface (24) communicates with the lower water-carrying area; It further includes: a liquid heat exchanger (4). An automatic pump body (2) is installed in the water supply system (1). The water outlet end of the water supply system (1) is connected to the cold water inlet end of the liquid heat exchanger (4). The preheated water discharge end of the liquid heat exchanger (4) is connected to the cold water inlet end of the double-effect condenser (6). The secondary preheated water discharge end of the double-effect condenser (6) is connected to the cold water inlet end of the preheating heat exchanger. The water to be preheated passes through the preheating heat exchangers of each stage of the evaporator assembly in sequence, from the preheating heat exchanger of the Nth stage evaporator assembly to the preheating heat exchanger of the first stage evaporator assembly. The Nth preheated water discharge end of the first-stage preheating heat exchanger is connected to the water inlet of the electric heating evaporator (8). The electric heating evaporator (8) has a critical temperature hot water outlet and a steam outlet. Among them, the steam outlet of the electric heating evaporator (8) is connected to the second steam inlet interface (21) through a second steam inlet pipeline (77). The second steam outlet interface (22) is connected to the steam inlet of the preheating heat exchanger (72) through a first steam outlet pipeline (76). At the same time, the second steam outlet interface (22) is connected to the second steam inlet interface of the effect evaporator of the next-stage evaporator assembly through a second steam outlet pipeline (710). The steam discharge outlet of the preheating heat exchanger (72) is connected to the steam inlet of the preheating heat exchanger of the next-stage evaporator assembly. The critical temperature hot water outlet of the electric heating evaporator (8) is connected to the bottom end of the central pipe (15) through a first hot water inlet pipeline (78). The first hot water outlet interface (24) is connected to the central pipe (15) of the effect evaporator of the next-stage evaporator assembly through a first hot water outlet pipeline (79); The first hot water outlet interface of the last-stage evaporator component's effect evaporator is connected to the hot water inlet end of the liquid heat exchanger (4). The cold water discharge end of the liquid heat exchanger (4) is connected to the drainage pipeline. The steam discharge port of the preheating heat exchanger of the last-stage evaporator component's effect evaporator is connected to the steam inlet of the double-effect condenser (6). The condensate water outlet of the double-effect condenser (6) is the distilled water outlet.

2. The electric heating multi-effect distilled water machine according to claim 1, characterized in that, The one-way overflow structure (23) includes: a fixed plate (231) and a floating plate (233). The fixed plate (231) is fixedly connected to the inner wall of the housing (14). At least two guiding holes (232) are formed in the fixed plate (231). The floating plate (233) can cover all the guiding holes (232). A guiding column body (234) is fixedly connected to the bottom of the floating plate (233). The guiding column body (234) is located inside the guiding hole (232), and the number of guiding column bodies (234) is less than the number of guiding holes (232).

3. The electric heating multi-effect distiller according to claim 1, characterized in that: An umbrella-shaped guide plate (18) is fixedly connected inside the housing (14) through a connecting piece (19). The umbrella-shaped guide plate (18) is located below the equalizing plate (16).

4. The electric heating multi-effect distilled water machine according to claim 1, characterized in that: The distilled water outlet has a first distilled water outlet end (10) and a second distilled water outlet end (11) arranged in parallel. A second solenoid valve (101) is installed on the first distilled water outlet end (10), and a third solenoid valve (111) is installed on the second distilled water outlet end (11). A control valve (5) is arranged on the water supply path between the liquid heat exchanger (4) and the double-effect condenser (6). The control valve (5) includes a normally closed valve (51) and a first solenoid valve (52). The normally closed valve (51) and the first solenoid valve (52) are connected by a parallel pipeline. It further includes: a control component (13) and a temperature detection component (12). The first solenoid valve (52), the second solenoid valve (101), the third solenoid valve (111), and the temperature detection component (12) are all electrically connected to the control component (13). The control mode of the control component (13) is: when the second solenoid valve (101) and the third solenoid valve (111) are both closed, the first solenoid valve (52) is closed; when at least one of the second solenoid valve (101) and the third solenoid valve (111) is open, the first solenoid valve (52) is open.

5. The electric heating multi-effect distilled water machine according to claim 4, wherein: A sampling port (9) is arranged at the distilled water outlet. The sampling port (9) is located behind the second solenoid valve (101) and the third solenoid valve (111).

6. The electric heating multi-effect distilled water machine according to claim 1, characterized in that: The automatic pump body (2) is provided with a water level detection component (3). The water level detection component (3) is used to monitor the water level inside the electric heating evaporator (8) and transmit the monitoring data to the control end of the automatic pump body (2).

7. The electric heating multi-effect distilled water machine according to claim 1, wherein: The multi-stage evaporator component (7) is a five-stage evaporator component.

8. The electric heating multi-effect distilled water machine according to claim 1, wherein: The condensate water outlet of the double-effect condenser (6) is connected with an exhaust branch pipe, and a breather is installed on the exhaust branch pipe.

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