Fully automatic negative pressure evaporation concentration equipment

Abstract

The present application relates to the technical field of bioengineering, and discloses a full-automatic negative pressure evaporation concentration device, which comprises a frame, a reaction kettle fixedly connected to the bottom of the inside of the frame, a trapezoidal pipe fixedly connected to the right side of the reaction kettle, a material pipe fixedly connected to the right side of the trapezoidal pipe, a liquid level meter installed in the reaction kettle, a heat medium circulation assembly installed at the bottom of the inside of the frame, the heat medium circulation assembly being communicated with the reaction kettle through a pipeline, a motor fixedly connected to the top of the reaction kettle, a stirring rod fixedly connected to the driving end of the motor, a valve control assembly installed on the front side of the material pipe, a pull rope arranged on the rear side of the valve control assembly, and a rubber plate fixedly connected to the other end of the pull rope and sliding on the inner wall of the trapezoidal pipe. In the present application, the rubber plate slides in the trapezoidal pipe to seal the small opening, block the passage between the left side of the material pipe and the reaction kettle, prevent residual wastewater from flowing in by inertia, ensure that the water amount entering the kettle is consistent with the preset value, and avoid the influence of water amount deviation on the evaporation efficiency, the stability of product concentration, and the batch uniformity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bioengineering technology, and particularly relates to a full-automatic negative pressure evaporation and concentration device. BACKGROUND

[0002] Bioengineering technology is a technology system integrating biology and engineering, covering fermentation engineering, genetic engineering, cell engineering and other branches. Among them, fermentation engineering regulates the metabolic environment of microorganisms, and uses the life activities of microorganisms such as yeast, lactic acid bacteria and actinomycetes to convert raw materials such as carbohydrates into various fermentation broths. These fermentation broths are rich in components, including medical-grade products such as antibiotics and vaccines, industrial raw materials such as organic acids and enzyme preparations, and food processing base materials such as yogurt and soy sauce. In the medical field, biological products such as penicillin and insulin produced through fermentation engineering have saved countless lives; in the food industry, the deep processing of fermentation broth makes the product flavor more unique and the nutrition more easily absorbed. Efficient processing of fermentation broth is a key link in the entire production chain, directly affecting product extraction purity, production energy consumption and environmental protection level.

[0003] The full-automatic negative pressure evaporation and concentration device is a core device for processing fermentation broth, and its core advantage lies in relying on the physical properties of the negative pressure environment to reduce the boiling point of the fermentation broth to 70-80℃, and realizing water evaporation and solute concentration under low temperature conditions. This process can perfectly avoid the damage of high temperature to the heat-sensitive components in the fermentation broth, such as the active structure of antibiotics and the survival ability of probiotics, and maximizes the biological activity of effective components.

[0004] However, in the prior art, some negative pressure evaporation and concentration devices lack effective passage blocking structures when processing wastewater. After the valve is closed, the residual wastewater between the left side of the material pipe and the reaction kettle will continue to flow into the reaction kettle due to inertia, resulting in a deviation between the actual amount of wastewater entering the reaction kettle and the preset value. This deviation can directly cause a series of problems: if the water quantity is too much, the evaporation time will be prolonged, the heat energy consumption will be much higher than expected, which not only increases the operating cost, but also may cause damage to some heat-sensitive components due to long-time heating; if the water quantity is too small, the evaporation process will be shortened, causing excess heat energy distribution, which not only wastes energy, but also may cause the wastewater to be concentrated too much, damaging the concentration stability of the product. More importantly, the instability of the water quantity will cause significant differences in the processing effect of different batches, which cannot guarantee the uniformity of the product quality, causing difficulties in the subsequent recycling link, and even affecting the application value of the final product, which is difficult to meet the requirements of precise control and stable output in industrial production.

[0005] Therefore, the full-automatic negative pressure evaporation and concentration device is proposed to solve the above problems. SUMMARY

[0006] In order to make up for the above shortcomings, the full-automatic negative pressure evaporation concentration equipment is provided to improve the problems of the partial negative pressure evaporation concentration equipment in the prior art, such as the residual wastewater inertia flowing into after the valve is closed due to the lack of blocking structure, the water deviation, and the influence on energy consumption, composition, product stability and uniformity.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] The full-automatic negative pressure evaporation concentration equipment comprises a frame, a reaction kettle is fixedly connected to the inside bottom end of the frame, a trapezoidal pipe is fixedly connected to the right side of the reaction kettle, a material pipe is fixedly connected to the right side of the trapezoidal pipe, a liquid level meter is installed in the inside of the reaction kettle, a heat medium circulation assembly is installed at the inside bottom end of the frame, the heat medium circulation assembly is communicated with the reaction kettle through a pipeline, a motor is fixedly connected to the top end of the reaction kettle, a stirring rod is fixedly connected to the driving end of the motor, a valve control assembly is installed on the front side of the material pipe, a pull rope is arranged on the rear side of the valve control assembly, a rubber plate is fixedly connected to the other end of the pull rope and slides on the inner wall of the trapezoidal pipe, a sliding sleeve that is in contact with the outside of the pull rope is slidingly connected to the inner wall of the material pipe, a sliding block is fixedly connected to the top end of the sliding sleeve, an air groove is formed in the bottom end of the sliding sleeve, a through groove that is communicated with the air groove is formed in the inner wall of the material pipe, and a hose is fixedly connected to the top of the material pipe.

[0009] As a further description of the above technical scheme:

[0010] The heat medium circulation assembly comprises a compressor, the bottom end of the compressor is fixedly connected to the inside bottom end of the frame, an oil-gas separator that is communicated with the reaction kettle is connected to the output end of the compressor through a pipeline, a condenser is connected to the rear side of the reaction kettle through a pipeline, the output end of the condenser is connected to a liquid storage tank through a pipeline, the output end of the liquid storage tank is connected to an evaporator through a pipeline, the output end of the evaporator is communicated with the input end of the compressor through a pipeline, and the evaporator is communicated with the steam outlet of the reaction kettle through a pipeline, a vacuum pump is connected to the rear side of the evaporator through a pipeline, and the vacuum pump is communicated with the reaction kettle through a pipeline.

[0011] As a further description of the above technical scheme:

[0012] The output end of the vacuum pump is connected to a water storage tank through a pipeline, a liquid level detector is installed in the inside of the water storage tank, a water pump is connected to the output end of the water storage tank through a pipeline, and a valve controlled by a control system is arranged on the pipeline between the water storage tank and the water pump.

[0013] As a further description of the above technical scheme:

[0014] The top end of the reaction kettle is fixedly connected to a vent pipe, and a valve for controlling the pressure venting of the reaction kettle is arranged on the vent pipe.

[0015] As a further description of the above technical solutions:

[0016] The valve control assembly comprises a valve handle, the rear side of the valve handle is rotationally connected to the front side of the material pipe, the rear side of the valve handle is fixedly connected with a ball valve rotating on the inner wall of the material pipe, the inner wall of the material pipe is fixedly connected with a plurality of stop blocks in contact with the ball valve, and one end of the pull rope is fixedly connected to the rear side of the valve handle.

[0017] As a further description of the above technical solutions:

[0018] The top of the material pipe is fixedly connected with a limiting column, the rear side of the limiting column is fixedly connected with a sliding box, and the pull rope is slidingly connected to the inner wall of the sliding box.

[0019] As a further description of the above technical solutions:

[0020] The right side of the rubber plate is fixedly connected with two sliding columns, the inner wall of the material pipe is fixedly connected with two support blocks for the sliding columns to slide, the right side of the sliding column is fixedly connected with a limiting plate, the right side of the rubber plate is fixedly connected with a spring, and the other end of the spring is fixedly connected to the left side of the support block.

[0021] As a further description of the above technical solutions:

[0022] The control system is installed in the interior of the frame and is electrically connected with the liquid level meter, the liquid level detector of the water storage tank, the material pipe, the compressor, the vacuum pump, the water pump, the motor and the ball valve.

[0023] The present application has the following advantages:

[0024] 1、In the present application, by sliding the rubber plate in the trapezoidal pipe and blocking the small opening, the passage between the left side of the material pipe and the reaction kettle can be blocked, effectively preventing residual wastewater in the pipeline from flowing into the reaction kettle due to inertia after the valve is closed, ensuring that the amount of wastewater entering the reaction kettle each time is consistent with the preset value. This design avoids the extension or shortening of the evaporation time caused by water quantity deviation, ensures the accuracy of heat energy distribution, and avoids affecting the subsequent evaporation concentration efficiency and product concentration stability, so that the treatment effect of each batch is kept uniform.

[0025] 2、In the present application, the wastewater remaining on the left side of the material pipe is drained to the right side of the ball valve through the hose by means of siphon effect, which can avoid long-term residual wastewater in the pipeline (especially when the interval between two uses is long). This ensures that only the preset amount of fresh wastewater is injected during the next delivery, preventing the growth of microorganisms, decomposition of components or pH value fluctuation of the residual wastewater due to standing, thereby avoiding interference with the reaction system and ensuring the accuracy of long-term operation of the equipment and the consistency of the treated product from the source. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The three-dimensional schematic view of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0027] Figure 2 The structural schematic view of the frame of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0028] Figure 3 The structural schematic view of the water pump of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0029] Figure 4 The structural schematic view of the stirring rod of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0030] Figure 5 The structural schematic view of the ball valve of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0031] Figure 6 The structural schematic view of the limiting column of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0032] Figure 7 The structural schematic view of the sliding column of the full-automatic negative pressure evaporation concentration equipment proposed by the present application;

[0033] Figure 8 The structural schematic view of the sliding sleeve of the full-automatic negative pressure evaporation concentration equipment proposed by the present application.

[0034] Legend:

[0035] 1, frame; 2, reaction kettle; 3, material pipe; 4, liquid level meter; 5, compressor; 6, oil-gas separator; 7, condenser; 8, liquid storage tank; 9, evaporator; 10, vacuum pump; 11, motor; 12, stirring rod; 13, water storage tank; 14, water pump; 15, vent pipe; 16, valve handle; 17, ball valve; 18, stop block; 19, pull rope; 20, limiting column; 21, sliding box; 22, rubber plate; 23, trapezoidal pipe; 24, sliding column; 25, supporting block; 26, limiting plate; 27, spring; 28, sliding sleeve; 29, sliding block; 30, air groove; 31, through groove; 32, hose. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Reference Figures 1 to 8The application provides a full-automatic negative pressure evaporation concentration device, which comprises a frame 1, a reaction kettle 2, a trapezoidal pipe 23, a rubber plate 22, a liquid level meter 4, a heat medium circulating assembly, an oil-gas separator 6, a condenser 7, a liquid storage tank 8, an evaporator 9, a vacuum pump 10, a motor 11, a stirring rod 12, a water storage tank 13, a water pump 14 and a vent pipe 15.

[0038] The output end of the liquid storage tank 8 is connected with the evaporator 9 through a pipeline, so that the heat medium is exchanged with water vapor evaporated from the reaction kettle 2, thereby improving the heat energy utilization rate; the output end of the evaporator 9 is connected with the input end of the compressor 5 through a pipeline, so that the heat-exchanged heat medium is returned to the compressor 5 for recycling; the evaporator 9 is connected with the steam outlet of the reaction kettle 2 through a pipeline, so as to receive the water vapor evaporated from the reaction kettle 2; the rear side of the evaporator 9 is connected with the vacuum pump 10 through a pipeline, so as to create a negative pressure environment for the reaction kettle 2 and to pump the liquefied water to the water storage tank 13; the heat medium circulating assembly is connected with the reaction kettle 2 through a pipeline, so as to provide heat energy for the reaction kettle 2; the vacuum pump 10 is connected with the reaction kettle 2 through a pipeline, so as to realize the negative pressure state in the reaction kettle 2; the top end of the reaction kettle 2 is fixedly connected with the motor 11, so as to provide driving force for the stirring rod 12; the driving end of the motor 11 is fixedly connected with the stirring rod 12, so as to stir the wastewater in the reaction kettle 2 to make the wastewater evenly heated; the output end of the vacuum pump 10 is connected with the water storage tank 13 through a pipeline, so as to store the liquid water generated by evaporation; the inside of the water storage tank 13 is installed with a liquid level detector, which transmits signals to a control system; the output end of the water storage tank 13 is connected with the water pump 14 through a pipeline, so as to transport the water in the water storage tank 13 to a water pool in a production workshop; a valve controlled by the control system is arranged on the pipeline between the water storage tank 13 and the water pump 14, so as to control the water supply of the water storage tank 13 to the water pump 14; the top end of the reaction kettle 2 is fixedly connected with the vent pipe 15, so as to realize pressure venting of the reaction kettle 2; a valve for controlling the pressure venting of the reaction kettle 2 is arranged on the vent pipe 15, so as to control the opening and closing of the vent pipe 15.

[0039] The front side of the material pipe 3 is provided with a valve control assembly for controlling the opening and closing of the material pipe 3 and the pull rope 19, the valve control assembly comprises a valve handle 16 for driving the ball valve 17 to rotate and pulling the pull rope 19, the rear side of the valve handle 16 is rotationally connected to the front side of the material pipe 3, and the rear side of the valve handle 16 is fixedly connected with the ball valve 17 rotating in the inner wall of the material pipe 3, the ball valve 17 controls the opening and closing of the material pipe 3 by rotating to adjust the wastewater conveying, the inside of the frame 1 is provided with a control system for receiving signals of each detection component and issuing instructions to control the operation of each execution component, the control system is electrically connected with the liquid level meter 4, the liquid level detector of the water storage tank 13, the material pipe 3, the compressor 5, the vacuum pump 10, the water pump 14, the motor 11 and the ball valve 17 respectively, the inner wall of the material pipe 3 is fixedly connected with a plurality of stop blocks 18 in contact with the ball valve 17 to limit the rotation angle of the ball valve 17 to ensure the sealing effect, the rear side of the valve control assembly is provided with the pull rope 19 for transmitting the pulling force of the valve handle 16 to drive the rubber plate 22 to slide, one end of the pull rope 19 is fixedly connected to the rear side of the valve handle 16, the top of the material pipe 3 is fixedly connected with a limiting column 20 fixedly connected with a sliding box 21, the rear side of the limiting column 20 is fixedly connected with the sliding box 21 for guiding and limiting the pull rope 19 to make the pull rope 19 slide stably, and the other end of the pull rope 19 is fixedly connected with the rubber plate 22 sliding in the inner wall of the trapezoidal pipe 23, the rubber plate 22 slides and blocks the small opening of the trapezoidal pipe 23 under the pulling of the pull rope 19 to block the inertial flow of wastewater.

[0040] The right side of the rubber plate 22 is fixedly connected with two slide columns 24 for providing guidance for the sliding of the rubber plate 22, the inner wall of the material pipe 3 is fixedly connected with two support blocks 25 for the slide columns 24 to slide, the support blocks 25 support and provide sliding tracks for the slide columns 24, the right side of the slide column 24 is fixedly connected with a limiting plate 26 for limiting the sliding range of the slide column 24 to prevent the rubber plate 22 from moving too far to the right, the right side of the rubber plate 22 is fixedly connected with a spring 27 for driving the rubber plate 22 to reset when the valve handle 16 resets to make the trapezoidal pipe 23 open, the other end of the spring 27 is fixedly connected to the left side of the support block 25, the inner wall of the material pipe 3 is slidingly connected with a sliding sleeve 28 in contact with the outside of the pull rope 19, the sliding sleeve 28 moves to the right under the friction of the pull rope 19 to expose the air groove 30, the top end of the sliding sleeve 28 is fixedly connected with a sliding block 29 for limiting the right moving distance of the sliding sleeve 28, the bottom end of the sliding sleeve 28 is provided with the air groove 30, part of the air groove 30 is exposed to the air after the sliding sleeve 28 moves to the right to make the air enter the left side of the material pipe 3, a through groove 31 is formed in the inner wall of the material pipe 3 and communicates with the air groove 30 to make the air in the air groove 30 enter the left side pipe of the material pipe 3 to balance the pressure, and a hose 32 is fixedly connected to the top of the material pipe 3 to drain the residual wastewater on the left side of the material pipe 3 to the right side under the action of the siphon effect.

[0041] Working principle: In the pretreatment section, after the salt wastewater (such as pickling wastewater) is exchanged by the ion membrane in the front section, the density, composition and water content are automatically detected, and the related parameters are input into the control system. The system automatically calculates the evaporation amount according to the related parameters, and provides accurate basis for subsequent automatic treatment.

[0042] The wastewater treated by the pre-treatment section is transported by the feed pump at a stable pressure, and enters the reactor 2 through the ball valve 17. The reactor 2 is the core reaction container of the entire evaporation and concentration process, and the liquid level meter 4 installed inside has high-precision monitoring function and can capture the liquid level change of the wastewater in the reactor in real time. When the liquid level reaches the preset wastewater amount, the liquid level meter 4 will immediately transmit a signal to the control system, and the control system will respond within milliseconds, and then drive the valve handle 16 to rotate, prompting the ball valve 17 to complete the closing action, and at the same time, the feed pump is instructed to stop, cutting off the continuous transportation of wastewater from the source, and realizing the precise control of the feed amount.

[0043] During the wastewater transportation process, the inside of the hose 32 is completely filled with wastewater, which lays a foundation for the subsequent drainage operation. During the closing process of the ball valve 17, the valve handle 16 will pull the pull rope 19 synchronously, and the pull rope 19 will be stably stressed under the guidance of the sliding box 21, driving the rubber plate 22 to smoothly slide in the trapezoidal tube 23, and finally accurately sealing the small opening of the trapezoidal tube 23. This design can effectively block the residual wastewater between the left side of the material pipe 3 and the reactor 2 from flowing into the reactor 2 due to inertia after the valve is closed, avoiding the deviation of the actual water amount entering the reactor from the preset value, and ensuring the stability of the subsequent evaporation and concentration reaction. At the same time, the friction between the pull rope 19 and the sliding sleeve 28 will drive the sliding sleeve 28 to move to the right, and the sliding block 29 will strictly limit the right-moving distance of the sliding sleeve 28, so that half of the air groove 30 at the bottom end of the sliding sleeve 28 is exposed to the air and keeps in communication with the through groove 31, allowing external air to smoothly enter the pipeline on the left side of the material pipe 3. Due to the higher liquid level on the left side of the ball valve 17 than on the right side, and the balance of the air flow into the pipeline, the wastewater remaining on the left side of the material pipe 3 will be accurately drained along the hose 32 to the right side of the ball valve 17 under the action of the siphon effect. In this way, even if the interval between two equipment uses is long, it can also ensure that the initial water amount entering the reactor 2 is exactly the same as the preset value during the next wastewater transportation, avoiding the deterioration or composition change of the residual wastewater in the pipeline due to long-term placement, which may interfere with the reaction system.

[0044] Subsequently, the control system will start the compressor 5, the compressor 5 operation generated by the power to push the heat medium into the circulation process. The heat medium first through the oil and gas separator 6, oil and gas separator 6 can efficiently separate the heat medium mixed with oil and gas components, to ensure the purity of the heat medium into the reactor 2 jacket, avoid impurities affect the heat exchange efficiency. Pure heat medium into the reactor 2 jacket, with the kettle inside the wastewater for full heat exchange, heat after the release of heat medium temperature, and then enter the condenser 7 cooling treatment, condenser 7 through the heat dissipation device to reduce the temperature of the heat medium to the appropriate range, the cooled heat medium flow into the storage tank 8 temporary storage. Storage tank 8 can play a buffering effect, to ensure that the heat medium continuously and stably into the evaporator 9, in the evaporator 9, heat medium and reactor 2 evaporation generated water vapor for the second heat exchange, absorb the heat of water vapor after temperature rise, finally back to the compressor 5, complete the whole heat medium cycle, this cycle design greatly improves the utilization of thermal energy, reduces the energy consumption of equipment.

[0045] When the reactor 2 in the wastewater heated to the set temperature by the heat medium in the jacket, the control system will issue instructions to start the vacuum pump 10, while the control motor 11 operation, the motor 11 drive stirring rod 12 to rotate at an appropriate speed. The vacuum pump 10 will extract the air in the reactor 2, create a negative pressure environment, under the condition of negative pressure, the boiling point of wastewater is significantly reduced, only need to reach 70-80 ℃ can quickly evaporate water vapor, compared with atmospheric evaporation greatly saves energy, improves the processing efficiency. Evaporation of water vapor will enter the evaporator 9, with the cooled heat medium from the storage tank 8 into the heat exchange, water vapor release heat after liquefied into liquid water, these liquid water under the action of the vacuum pump 10 is transported to the storage tank 13 storage. Storage tank 13 in the storage of liquid water after treatment is neutral (PH≈7), can be directly recycled, the liquid level detector installed inside the storage tank 13 can real-time monitoring of water, when the liquid level reaches the preset value, the liquid level detector will signal transmission to the control system, the control system will start the water pump 14, and open the valve below the storage tank 13, the stored water to the production workshop water pool, realize the recycling of water resources.

[0046] When the wastewater in the reactor 2 is concentrated by evaporation for a period of time to form solid salt crystals or reach a preset concentration, the liquid level meter 4 will detect the corresponding liquid level signal and transmit it to the control system, which will immediately instruct the compressor 5 and the vacuum pump 10 to stop working, terminate the heat medium circulation and the negative pressure environment. At the same time, the control system will open the valve on the vent pipe 15 to vent and depressurize the reactor 2, so that the internal pressure of the reactor 2 returns to normal pressure, providing safe conditions for subsequent discharge operation. After that, the valve at the bottom of the reactor 2 is opened, and the forced feeding pump is started to smoothly transport the solid salt crystals in the reactor 2 to the recycling workshop for further processing, realizing the recycling and reuse of salt resources, and the whole process forms an efficient, environmentally friendly and closed-loop treatment system.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application 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 make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. Fully automatic negative pressure evaporation and concentration equipment, comprising a frame (1), characterized in that: The bottom end of the interior of the frame (1) is fixedly connected to a reactor (2), the right side of the reactor (2) is fixedly connected to a trapezoidal tube (23), the right side of the trapezoidal tube (23) is fixedly connected to a material pipe (3), a liquid level gauge (4) is installed inside the reactor (2), a heat medium circulation assembly is installed at the bottom end of the interior of the frame (1), the heat medium circulation assembly is connected to the reactor (2) through a pipeline, the top end of the reactor (2) is fixedly connected to a motor (11), the driving end of the motor (11) is fixedly connected to a stirring rod (12), the material pipe The front side of the material tube (3) is provided with a valve control component, the rear side of the valve control component is provided with a pull rope (19), the other end of the pull rope (19) is fixedly connected to a rubber plate (22) sliding on the inner wall of the trapezoidal tube (23), the inner wall of the material tube (3) is slidably connected to a sliding sleeve (28) in contact with the outside of the pull rope (19), the top of the sliding sleeve (28) is fixedly connected to a slider (29), the bottom end of the sliding sleeve (28) is provided with an air groove (30), the inner wall of the material tube (3) is provided with a through groove (31) communicating with the air groove (30), the top of the material tube (3) is provided with a through groove (31) communicating with the air groove (30), and the top of the material tube (3) is provided with a through groove (31) communicating with the air groove (30). The top of the material pipe (3) is fixedly connected to a hose (32); the valve control assembly includes a valve handle (16), the rear side of the valve handle (16) is rotatably connected to the front side of the material pipe (3), the rear side of the valve handle (16) is fixedly connected to a ball valve (17) that rotates on the inner wall of the material pipe (3), the inner wall of the material pipe (3) is fixedly connected to a plurality of blocks (18) that contact the ball valve (17), and one end of the pull rope (19) is fixedly connected to the rear side of the valve handle (16); the top of the material pipe (3) is fixedly connected to a limiting column (20), and the rear side of the limiting column (20) is fixedly connected to a sliding The box (21) is provided with a pull rope (19) which is slidably connected to the inner wall of the sliding box (21); one end of the hose (32) is located on the left side of the ball valve (17), and the other end of the hose (32) is located on the right side of the ball valve (17). During the wastewater transportation process, the inside of the hose (32) will be completely filled with wastewater. After the ball valve (17) is closed, since the liquid level on the left side of the ball valve (17) is higher than that on the right side, and the air flows in to balance the pressure in the pipeline, under the action of the siphon effect, the wastewater retained on the left side of the material pipe (3) will be accurately drained along the hose (32) to the right side of the ball valve (17).

2. The fully automatic negative pressure evaporation and concentration equipment according to claim 1, characterized in that: The heat medium circulation assembly comprises a compressor (5), the bottom end of the compressor (5) is fixedly connected to the inner bottom end of the frame (1), the output end of the compressor (5) is connected to an oil-gas separator (6) in communication with the reactor (2) through a pipeline, the rear side of the reactor (2) is connected to a condenser (7) through a pipeline, the output end of the condenser (7) is connected to a liquid storage tank (8) through a pipeline, the output end of the liquid storage tank (8) is connected to an evaporator (9) through a pipeline, the output end of the evaporator (9) is in communication with the input end of the compressor (5) through a pipeline, and the evaporator (9) is in communication with the steam outlet of the reactor (2) through a pipeline, the rear side of the evaporator (9) is connected to a vacuum pump (10) through a pipeline, and the vacuum pump (10) is in communication with the reactor (2) through a pipeline.

3. The fully automatic negative pressure evaporation and concentration equipment according to claim 2, characterized in that: The output end of the vacuum pump (10) is connected to a water storage tank (13) via a pipeline, a liquid level detector is installed inside the water storage tank (13), the output end of the water storage tank (13) is connected to a water pump (14) via a pipeline, and a valve controlled by a control system is provided on the pipeline between the water storage tank (13) and the water pump (14).

4. The fully automatic negative pressure evaporation and concentration equipment according to claim 1, characterized in that: The top of the reactor (2) is fixedly connected to a vent pipe (15), and the vent pipe (15) is provided with a valve for controlling the pressure venting of the reactor (2).

5. The fully automatic negative pressure evaporation and concentration equipment according to claim 1, characterized in that: Two sliding columns (24) are fixedly connected to the right side of the rubber plate (22), two support blocks (25) for sliding the sliding columns (24) are fixedly connected to the inner wall of the material tube (3), a limiting plate (26) is fixedly connected to the right side of the sliding column (24), a spring (27) is fixedly connected to the right side of the rubber plate (22), and the other end of the spring (27) is fixedly connected to the left side of the support block (25).

6. The fully automatic negative pressure evaporation and concentration equipment according to claim 3, characterized in that: A control system is installed inside the frame (1), and the control system is electrically connected to the liquid level meter (4), the liquid level detector of the water storage tank (13), the material pipe (3), the compressor (5), the vacuum pump (10), the water pump (14), the motor (11) and the ball valve (17).

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