CN114987958A - Unpowered constant-voltage source device and flow control system - Google Patents

Abstract

The invention discloses an unpowered constant-voltage source device which comprises a sealed container 1 and a voltage stabilizing tube 2. The top of the sealed container 1 is provided with a liquid inlet pipe 11 and an exhaust pipe 12, and the bottom is provided with a liquid outlet pipe 13. The liquid inlet pipe and the exhaust pipe are in a closed state. A surge tank 2 is disposed within the sealed vessel 1 and extends through the wall of the sealed vessel 1 to the exterior of the vessel. The outer end opening 21 of the pressure stabilizing tube is higher than the highest point of the sealed container 1, and the inner end opening 22 is positioned above the outlet 130 of the liquid outlet tube 13, and forms a height difference h with the outlet 130. When the liquid material in the sealed container 1 flows out from the outlet 130, negative pressure is generated in the sealed container along with the liquid level reduction, and under the action of the negative pressure, external air is sucked into the sealed container through the pressure stabilizing tube to counteract the negative pressure generated by the liquid level reduction, so that the pressure of the outlet 130 is constant when the liquid material flows out, and the liquid material flow is constant.

Description

Unpowered constant-voltage source device and flow control system

Technical Field

The invention relates to an unpowered constant-voltage source device and a flow control system, in particular to an unpowered constant-voltage source device and a flow control system for adding chemicals (water treatment agents) in sewage treatment.

Background

In the industrial field, the liquid material in the pressure container is usually regulated to meet the requirement of constant flow rate when the liquid material is conveyed outwards. In industrial wastewater treatment, for example, constant flow dosing devices are commonly used to dose the agent. Existing constant flow medicated devices are typically constructed using a dosing pump and a controller. For example, patent No. CN200964346Y discloses a constant pressure liquid source device, which is composed of a pressure stabilizing tank, a pressure detecting device, a pump, and a control box. The surge tank is divided into an upper tank body and a lower tank body, a liquid storage chamber is formed in the inner cavity of the upper tank body and used for storing liquid, the lower tank body is communicated with a compressed air source through an air inlet, an air storage chamber is formed in the inner cavity of the lower tank body, and a rubber membrane is arranged between the upper tank body and the lower tank body for isolation.

When outside output constant flow liquid, along with the liquid level change, its stock solution room pressure reduces, make the pressure of gas receiver be greater than stock solution room pressure, at this moment, the pressure of gas receiver promotes rubber isolating device's rubber membrane upwards squint, thereby drive pressure measurement device rebound, pressure measurement device has detected the signal of rubber membrane upwards squint, the signal that stock solution room pressure reduced has also been detected, the control quick response hydraulic pump, in time pour into a certain amount of liquid into the stock solution room, ensure that liquid pressure stabilizes at the pressure range of settlement again, guarantee that liquid flow is invariable.

Because the liquid constant voltage source device needs to detect the deviation of the rubber membrane and quickly start the hydraulic pump when the deviation occurs, the structure is complex, uninterrupted power supply is needed, and the stability of the power supply is higher. In addition, the pump is directly contacted with the medicament, so that the pump is easy to corrode and damage, short in service life and high in cost.

With the improvement of environmental protection requirements, wastewater treatment gradually develops towards 'near zero discharge of industrial wastewater and resource utilization'. Different from the mode of concentrated post-treatment of waste water, "near zero release and resourceful" of industrial waste water needs to handle the waste water that produces at the source, and a large amount of liquid constant voltage source devices set up in different regions, and not only power consumption is huge, and its management and maintenance cost are also very huge.

The first purpose of the invention is to improve the existing liquid constant-voltage source device and provide an unpowered constant-voltage source device which has simple structure and can realize the outward delivery of constant-flow liquid without external power supply.

A second object is to provide a flow control system which is simple in construction and which can continuously provide a constant flow.

Disclosure of Invention

The first technical scheme of the invention is an unpowered constant-voltage source device, which comprises a sealed container 1 and a voltage-stabilizing tube 2. The sealed container 1 is internally used for storing liquid materials, the top of the sealed container is provided with a liquid inlet pipe 11 and an exhaust pipe 12 which are communicated with the inside of the sealed container 1, and the bottom of the sealed container is provided with a liquid outlet pipe 13 which is communicated with the inside of the sealed container 1.

A liquid inlet valve 111 is arranged in the liquid inlet pipe 11 and used for controlling the opening and closing of the liquid inlet pipe 11, an exhaust valve 121 is arranged in the exhaust pipe 12 and used for controlling the opening and closing of the exhaust pipe 12, and a control valve 131 is arranged in the liquid outlet pipe 13 and used for controlling the opening and closing of the liquid outlet pipe 13.

The pressure stabilizing tube 2 is arranged in the sealed container 1, the outer end of the pressure stabilizing tube penetrates through the wall of the sealed container 1, the pressure stabilizing tube extends to the outside and is communicated with the inside of the sealed container 1 and the atmosphere, the inner end of the pressure stabilizing tube extends to the bottom of the sealed container 1, the opening 22 at the inner end is higher than the outlet 130 of the liquid outlet tube 13, and a height difference h is formed between the opening 22 at the inner end and the outlet 130 of the liquid outlet tube 13.

Therefore, liquid materials are filled into the sealed container 1, the inner end opening 22 of the pressure stabilizing tube 2 is immersed in the liquid materials, after the filling is finished, the liquid inlet valve 111 and the exhaust valve 121 are closed, the sealed container 1 is in a closed state, and the liquid materials can be output in a constant flow mode by means of the gravity of the liquid materials.

That is, when the control valve 131 is opened, the liquid flows out from the outlet 130 of the liquid outlet pipe 13 under the action of gravity due to the height difference h formed between the inner end opening 22 of the pressure maintaining pipe 2 and the outlet 130 of the liquid outlet pipe 13. With the reduction of the liquid material in the sealed container 1, the liquid level descends, negative pressure is generated above the liquid level because the space in the sealed container 1 is sealed by the liquid material, external air is sucked into the sealed container 1 through the pressure stabilizing tube 2 under the action of the negative pressure, the sucked air counteracts the negative pressure generated by the descending of the liquid level, the pressure balance state in the sealed container 1 is maintained, the pressure at the outlet 130 of the liquid outlet tube 13 cannot be reduced along with the descending of the liquid level, and the liquid material is output in constant flow.

Preferably, an inlet (132) of the liquid outlet pipe (13) connected with the sealed container (1) is positioned above the outlet (130), and an inner end opening (22) of the pressure stabilizing pipe (2) is flush with the inlet (132) or positioned below the inlet (132) and above the outlet (130).

Because the inner end opening (22) of the pressure stabilizing tube (2) is flush with the inlet (132) or is positioned below the inlet (132) and above the outlet (130), the pressure at the outlet (130) of the liquid outlet tube (13) can be ensured to be constant in the whole liquid material output process until the liquid level is lowered to the inlet (132) of the liquid outlet tube (13), and the liquid material is output in a constant flow.

Preferably, the pressure stabilizing tube 2 and the liquid outlet tube 13 are round tubes, and the ratio of the inner diameter T of the pressure stabilizing tube 2 to the inner diameter T of the liquid outlet tube 13 is 1.2-1.5: 1.

when the liquid material flows out, air enters the sealed container 1 through the pressure stabilizing tube 2, namely, the external air is used for replacing the liquid material in the sealed container 1, if the pressure stabilizing tube 2 is too thin, the resistance of the air entering the sealed container 1 is too large, the output flow of the liquid material is reduced, and the flow is insufficient.

Meanwhile, when air enters the sealed container 1 through the pressure stabilizing tube 2, due to the surface tension of the liquid material, bubbles are formed in the liquid material firstly, float to the liquid level in a bubble mode and are released to the sealed container after being broken, namely, the air enters the sealed container 1 in an intermittent state, the pressure stabilizing tube is too thick, the generated bubbles are large, and the fluctuation of the liquid material flow is also large. Limiting the ratio of the inner diameter T of the pressure stabilizing tube 2 to the inner diameter T of the liquid outlet tube 13 to 1.2-1.5: 1, the flow of the liquid material can be reduced or avoided to be reduced, and the fluctuation of the flow of the liquid material can be reduced.

Preferably, the sealed container 1 is cylindrical with two ends bulging outwards, the exhaust pipe 12 is arranged in the center of the top of the sealed container 1, the pressure stabilizing pipe 2 and the feeding pipe 11 are symmetrically arranged on two sides of the exhaust pipe 12, and an opening 21 in the outer end of the pressure stabilizing pipe 2 is higher than the highest point of the top of the sealed container 1.

Because the sealed container 1 is in a cylindrical shape with two ends bulging outwards, the rigidity of the sealed container 1 is improved, and the storage capacity of liquid materials is increased. And when liquid materials are added, the liquid materials can not flow out from the outer end opening 21 of the pressure stabilizing tube 2.

Preferably, the liquid outlet pipe 13 is arranged on the wall of the sealed container 1 at the position farthest away from the pressure stabilizing pipe 2.

Therefore, disturbance of the pressure near the liquid outlet pipe 13 when air bubbles enter the liquid can be reduced, and fluctuation of the liquid flow can be further reduced.

Preferably, an evacuation pipe 14 and an evacuation valve 17 for controlling the evacuation pipe 14 to open and close are provided at the center of the bottom of the sealed container 1, a plurality of support legs 15 for supporting are provided around the evacuation pipe 14, and a communication type liquid level meter 3 communicating with the inside of the sealed container 1 is provided on the side wall of the sealed container 1.

Therefore, the sediment in the hermetic container 1 can be discharged through the evacuation pipe 14. Because the height of the sealed container 1 is raised by the supporting legs 15, the outlet 130 of the liquid outlet pipe 13 can be arranged lower, the height difference h between the opening 22 at the inner end of the pressure stabilizing pipe 2 and the outlet 130 of the liquid outlet pipe 13 is increased, the utilization rate of the internal space of the sealed container 1 is improved, and the liquid flow is improved.

Preferably, the outer end of the stabilivolt 2 is in an inverted L shape or an inverted U shape, and the outer end opening 21 faces to the side or the lower part.

Therefore, sundries can be prevented from entering the sealed container 1 through the pressure stabilizing tube 2 to pollute the liquid.

Preferably, the control valve 131 in the liquid outlet pipe 13 has an opening degree adjusting function.

Therefore, the flow rate of the liquid material can be adjusted by controlling the valve 131.

The bottom of the sealed container 1 may be arranged in a conical shape, and the liquid outlet pipe 13 is arranged on the side wall of the conical part.

Therefore, the space below the liquid outlet pipe 13 can be reduced, and the utilization rate of the space inside the sealed container 1 can be further improved.

The second technical solution is a flow control system, which includes at least two unpowered constant voltage source devices 10a and 10b and a switching device 50.

The liquid inlet pipe of each unpowered constant-voltage source device is connected with the liquid inlet main pipe 20, and the switching device comprises at least two flow meters, at least two valve control modules and a switching module.

Each flowmeter detects the corresponding liquid material flow of the unpowered constant-pressure source device, each valve control module has two states of outputting liquid materials and supplementing liquid materials, when the liquid materials are output, the corresponding control valve of the unpowered constant-pressure source device is opened, when a liquid inlet valve, an exhaust valve and the supplementing liquid materials are closed, the control valve is closed, the liquid inlet valve and the exhaust valve are opened, one valve control module is in the state of outputting the liquid materials, and the other valve control module is in the state of supplementing the liquid materials.

The switching module judges the change of the liquid material flow according to the detection value of the flow meter, and switches the states of the two valve control modules when the flow is linearly reduced or zero.

Therefore, when air directly enters the sealed container without passing through the liquid material at the position below the opening at the inner end of the liquid level reduction pressure stabilizing tube in the sealed container, the unpowered constant-voltage source device can be switched in time, and the liquid material can be continuously output in a constant flow without being limited by the volume of the sealed container.

Drawings

FIG. 1 is a front view of an unpowered constant source device;

FIG. 2 is a top view of the unpowered constant source device;

FIG. 3 is a side view of the unpowered constant source device;

FIG. 4 is an explanatory view of bubbles entering the liquid material when a small-diameter stabilivolt is used;

FIG. 5 is an illustration of bubbles entering the liquid material when a large diameter stabilivolt is used;

FIG. 6a is an illustration of a configuration in which a height differential is formed between the opening at the inner end of the stabilivolt and the outlet of the outlet tube;

FIG. 6b is an illustration of an alternative configuration for providing a height differential between the opening at the inner end of the stabilivolt and the outlet of the effluent line;

FIG. 7 is an explanatory view of a first modification of a stabilivolt;

fig. 8 is an explanatory view of a second modification of the stabilivolt;

FIG. 9 is an explanatory view of a modification of the opening at the inner end of the stabilivolt;

fig. 10 is an explanatory view of a third modification of the surge tank;

FIG. 11 is an illustration of a sealed container with a conical bottom;

FIG. 12a is a diagram illustrating the hardware configuration of a flow control system;

fig. 12b is a control explanatory diagram of the flow rate control device.

Detailed Description

In the following detailed description of the preferred embodiments of the invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific features of the invention, such that the advantages and features of the invention may be more readily understood and appreciated. The following description is an embodiment of the claimed invention, and other embodiments not specifically described in connection with the claims also fall within the scope of the claims.

The unpowered constant-source device of the present invention will be described below by taking an example of dosing a chemical agent in industrial wastewater treatment.

As shown in fig. 1 to 3, the unpowered constant source device mainly comprises a sealed container 1 and a pressure-stabilizing tube 2. The sealed container 1 is cylindrical with two ends bulging outwards and is used for storing liquid materials. A liquid inlet pipe 11 and an exhaust pipe 12 for liquid inlet are arranged at the top, a liquid outlet pipe 13 is arranged at the bottom, and a control valve 131 is arranged in the liquid outlet pipe 13. The inlet pipe 11 is provided with an inlet valve 111 for controlling the opening and closing of the inlet pipe 11, and the outlet pipe 12 is provided with an outlet valve 121 for controlling the opening and closing of the outlet pipe 12.

In this embodiment, the control valve 131 can close the liquid outlet pipe 13, adjust the opening thereof, and control the flow rate.

As shown in fig. 1, the pressure maintaining tube 2 is disposed inside the sealed container 1, and has an outer end penetrating through the wall of the sealed container 1 and extending to the outside to communicate the inside of the sealed container 1 with the atmosphere. The outer end opening 21 of the surge tank 2 is higher than the highest point in the interior of the sealed vessel 1. The inner end of the stabilivolt 2 extends down to the bottom and the inner end opening 22 is at the same height as the inlet 132 of the outlet pipe 13, higher than the outlet 130 of the outlet pipe 13.

Namely, the liquid outlet pipe 13 is a pipe bent at 90 degrees, the horizontal part is installed on the sealed container 1, the height of the horizontal part is the same as that of the inner end opening 22, the vertical part is bent downwards, and a height difference h is formed between the outlet 130 and the inner end opening 22 of the stabilivolt 2. The height difference h between the outlet 130 of outlet pipe 13 and the inner end opening 22 of the stabilivolt 2 is shown by way of example only and may be set higher as desired in fig. 6a, 6b to increase the flow. When a water treatment agent (liquid material) is added into the sealed container 1, the inner end opening 22 of the pressure stabilizing tube 2 is positioned below the liquid level of the water treatment agent (see figures 4 and 5).

Parts such as the sealed container 1, the stabilivolt 2 and the like which are contacted with the water treatment agent are made of corrosion-resistant materials.

In this embodiment, the pressure stabilizing tube 2 and the liquid outlet tube 13 are circular tubes, and the inner diameter D of the pressure stabilizing tube 2 is larger than the inner diameter D of the liquid outlet tube 13.

The outer end of the stabilivolt 2 is in an inverted L shape, and the opening 21 of the outer end faces to the side. As a modification, the outer end of the surge tube 2 may be formed in an inverted U shape with the outer end opening 21 directed downward. A pressure maintaining valve 211 for controlling the size of the air flow is provided in the outer end of the pressure maintaining tube 2.

When viewed from the front, as shown in fig. 1 and 3, the exhaust pipe 12 is disposed at the center of the top of the hermetic container 1, and the pressure-stabilizing pipe 2 and the feed pipe 11 are symmetrically disposed at both sides of the exhaust pipe 12. The liquid outlet pipe 13 is arranged on the opposite side of the pressure stabilizing pipe 2 by taking the central shaft of the sealed container 1 as the center, and keeps the maximum distance with the pressure stabilizing pipe 2.

The center of the bottom of the sealed container 1 is provided with an evacuation pipe 14 and an evacuation valve 17 for controlling the opening and closing of the evacuation pipe 14. Around the evacuation pipe 14, three legs 15 are provided for support. The arrangement of the supporting legs 15 also raises the height of the sealed container 1, so that the outlet 130 of the liquid outlet pipe 13 can be arranged at a lower position, and the distance h between the outlet and the inner end opening 22 of the pressure stabilizing pipe 2 is increased, so that the flow of the water treatment agent is increased. A communication type liquid level meter 3 communicating with the inside of the sealed container 1 is provided on the side wall of the sealed container 1.

In this embodiment, the height of the sealed container 1 is 1600mm, the diameter is 1000mm, the pipe diameter of the liquid inlet pipe 11 is DN100, the pipe diameter of the liquid outlet pipe 13 is DN40, the pipe diameter of the pressure stabilizing pipe 2 is DN50, the pipe diameter of the gas outlet pipe 12 is DN100, and the height from the inner end opening 22 of the pressure stabilizing pipe 2 and the inlet 132 of the liquid outlet pipe 13 to the bottom end of the sealed container 1 is about 200 mm.

Because the sealed container 1 is used for storing the water treatment agent, the inner end opening 22 of the pressure stabilizing tube 2 and the inlet 132 of the liquid outlet tube 13 are positioned below the liquid level of the water treatment agent, and a height difference h is formed between the inner end opening 22 of the pressure stabilizing tube 2 and the outlet 130 of the liquid outlet tube 13, when the liquid inlet valve 111, the exhaust valve 121 and the exhaust valve 17 are closed, the interior of the sealed container 1 is in a closed state.

When adding chemicals (outputting liquid materials), the pressure stabilizing valve 211 and the control valve 131 are opened, and at the moment, the water treatment agent in the sealed container 1 flows out from the outlet 130 of the liquid outlet pipe 13 under the action of gravity. With the reduction of the water treatment agent in the sealed container 1, the liquid level descends, negative pressure is generated above the liquid level because the space in the sealed container 1 is sealed by the water treatment agent, external air is sucked into the sealed container 1 through the pressure stabilizing tube 2 under the action of the negative pressure, the sucked air counteracts the negative pressure generated by the descending of the liquid level, the pressure balance in the sealed container 1 is maintained, the pressure at the outlet 130 of the liquid outlet tube 13 cannot be reduced along with the descending of the liquid level, and the water treatment agent can be thrown in the industrial wastewater treatment in a constant flow direction without external power supply.

Because the inner end opening 22 of the stabilivolt tube 2 and the inlet 132 of the liquid outlet tube 13 are at the same height, the liquid level drops to the inner end opening 22 of the stabilivolt tube 2, and when the inside of the sealed container 1 is communicated with the atmosphere, the water treatment agent cannot flow out from the outlet 130 of the liquid outlet tube 13. In the whole dosing process, the water treatment agent is always thrown into the industrial wastewater in a constant flow, and the overproof discharge of pollutants caused by insufficient throwing amount can be avoided.

As a variant, the inner end opening 22 of the pressure-stabilizing tube 2 can also be arranged below the inlet 132 and above the outlet 130 of the liquid outlet tube 13, which arrangement also ensures a constant pressure at the outlet 130 of the liquid outlet tube 13 and a constant flow of liquid during the whole liquid output process.

When the water treatment agent is added into the sealed container 1, the control valve 131 on the liquid outlet pipe 13 is closed, the liquid inlet valve 111 and the exhaust valve 121 are opened, and the water treatment agent is conveyed to a position H (see figures 4 and 5) above the opening 22 at the inner end of the pressure stabilizing pipe 2 through the liquid inlet pipe 11.

Because the liquid inlet pipe 11 and the exhaust pipe 12, the outer end opening 21 of the pressure stabilizing pipe 2 is higher than the highest point of the top of the sealing container 1, when a water treatment agent is additionally arranged, the water treatment agent cannot flow out from the openings of the pipes, and the safety is ensured.

When the water treatment agent flows out, air enters the sealed container 1 through the pressure stabilizing tube 2, namely, external air is used for replacing liquid materials in the sealed container 1, and the inner diameter D of the pressure stabilizing tube 2 is set to be larger than the inner diameter D of the liquid outlet tube 13, so that the influence on the output flow of the water treatment agent caused by large resistance when the air enters can be avoided.

Due to the surface tension of the water treatment agent, when air enters the sealed container 1 through the pressure stabilizing tube 2, bubbles are formed in liquid materials firstly, the bubbles float to the liquid level and are broken to release the air, namely, the air enters the sealed container 1 in an intermittent state and is influenced by the bubbles, and the flow of the water treatment agent can generate large fluctuation. The ratio of the inner diameter T of the stabilivolt 2 to the inner diameter T of the liquid outlet pipe 13 is limited to 1.2-1.5: 1, the generation of large bubbles can be avoided, and the fluctuation of the flow of the water treatment agent is reduced.

Fig. 4 is an explanatory view of bubbles discharged into the liquid material when a small-diameter pressure-maintaining tube is used, and fig. 5 is an explanatory view of bubbles discharged into the liquid material when a large-diameter pressure-maintaining tube is used. Fig. 4 and 5 are sectional views a-a of the sealed container 1 of fig. 2.

When the small-diameter stabilivolt 2 is adopted, as shown in fig. 4, the generated bubbles are small and dense due to the small diameter of the pipe, and the fluctuation of the pressure in the sealed container 1 is small when the bubbles float to the liquid level and are broken.

On the contrary, when the wide-diameter pressure-stabilizing pipe 2 is used, as shown in fig. 5, the generated bubbles are large and small because of the wide pipe diameter, and the fluctuation of the pressure in the sealed container (1) caused by the bubble breakage is large.

Comprehensively considering, the ratio of the inner diameter T of the stabilivolt 2 to the inner diameter T of the liquid outlet pipe 13 is limited to 1.2-1.5: 1, the flow fluctuation caused by the excessively thin pipe diameter and the excessively thick pipe diameter can be balanced.

The flow rate (flow velocity) of the water treatment agent depends on the height difference h between the opening 22 at the inner end of the pressure stabilizing tube 2 and the outlet 130 of the liquid outlet tube 13. As shown in fig. 6a, for example, using a hose connected to outlet 13, outlet 130 is moved downwardly to increase the height difference h between opening 22 at the inner end of plenum 2 and outlet 130 of outlet 13, increasing the flow rate. Or as shown in fig. 6b, the height difference h between the opening 22 at the inner end of the stabilivolt 2 and the outlet 130 of the liquid outlet pipe 13 is increased by shortening the length of the stabilivolt 2 so as to achieve the purpose of increasing the flow of the water treatment agent. Since a constant flow can only be achieved when the inner end opening 22 of the pressure maintaining tube 2 is below the liquid level, the latter is less useful in the utilization of the inner volume of the container than the former.

The following describes modifications of the present invention.

Fig. 7 is an explanatory view of a first modification of the stabilivolt. As shown in fig. 7, in the first modification, a bent tube is used as the surge tank 2a, and the rest is the same as in the above embodiment. The stabilivolt 2a can adopt a square tube, an oval tube or a special tube with regular or irregular cross section.

Fig. 8 is an explanatory view of a second modification of the surge tank. As shown in fig. 8, the pressure-stabilizing pipe 2b obliquely penetrates through the side wall of the sealed container 1 to enter the sealed container 1, and the outlet of the pressure-stabilizing pipe 2b is oblique. As in fig. 7, since the opening of the stabilivolt 2b is inclined, air can more easily enter the water treatment agent, and relatively small bubbles can be generated when the air enters the sealed container 1 through the stabilivolt 2 b. Because the disturbance generated by the small bubbles is smaller than that generated by the large bubbles, the disturbance generated when the air enters the water treatment agent is reduced, and the fluctuation of the flow of the water treatment agent is reduced.

Fig. 9 is an explanatory view of a modification of the inner end opening of the stabilivolt. As shown in fig. 9, the inner end opening 22c of the surge tube 2c is closed, and a plurality of holes for air to flow through are formed in the tube wall near the inner end opening 22 c. The holes may take the form of circles, squares, triangles or other irregular shapes. The area of each hole is greater than or equal to the internal diameter cross-sectional area of the stabilivolt 2 c.

Therefore, when air enters the sealed container 1 through the pressure stabilizing tube 2c, formed bubbles are dispersed and have small volume, and flow fluctuation of the water treatment agent caused by disturbance of the bubbles is reduced.

Fig. 10 is an explanatory view of a third modification of the surge tank. As shown in fig. 10, the surge tank 2d is an L-shaped pipe, the vertical portion is located outside the hermetic container 1, and the horizontal portion is arranged to penetrate the side wall of the hermetic container 1 into the hermetic container 1 in a horizontal or oblique direction. The rest is the same as the structure of fig. 1.

With the above structure, for example, the vertical portion of the stabilivolt 2d can be made of transparent material, such as acrylic, glass, etc., instead of the communication type liquid level meter 3.

Fig. 11 is an explanatory view of a sealed container with a conical bottom. As shown in FIG. 11, the bottom of the sealed container 1a is a conical bottom, and the liquid outlet pipe 13a is arranged on the side wall of the conical bottom and is arranged near the vertex of the cone.

The bottom of the sealed container 1a is tapered, and the tapered portion has a small volume, so that the internal space of the sealed container 1a can be utilized to the maximum extent.

In the invention, the pressure stabilizing tube is arranged in the sealed container 1, and negative pressure generated in the sealed container 1 automatically sucks air when the liquid level is lowered by utilizing the sealing action of the water treatment agent, so that the pressure in the sealed container 1 is increased, the pressure reduction caused by the liquid level lowering and the outlet 130 of the liquid outlet pipe 13 is counteracted, the pressure at the outlet 130 of the liquid outlet pipe 13 is kept stable, and the effect of providing a constant flow water treatment agent without power is achieved. The pipe diameter ratio of the pressure stabilizing pipe 2 to the outlet 130 of the liquid outlet pipe 13 is set, so that the influence of air entering on the flow of the water treatment agent and the flow fluctuation caused by the air entering are reduced. Further improving the effect of the water treatment agent thrown in constant flow without the power flow control device.

Because the whole control process does not need external power or auxiliary power such as a pump and a controller for controlling the flow, the power supply condition does not need to be considered during setting, the service life is long, the cost is low, and the management and maintenance cost is also low.

The device is particularly suitable for dosing when the produced wastewater is treated at the source, namely, the wastewater is not required to be subjected to centralized post-treatment, the unpowered flow control devices can be arranged at different wastewater sources, corresponding treating agents are selected for treating pollutants in the wastewater independently, and zero discharge and recycling of the wastewater are realized. The unpowered flow control device of the invention does not need power supply and wearing parts such as pumps, has no power consumption, and is very simple to manage and maintain, thereby obviously reducing the cost of wastewater treatment.

The unpowered flow rate control device of the present invention has been described above by taking the administration of a chemical in the treatment of industrial wastewater as an example. Due to the volume limitation of the sealed container 1, when the water treatment agent is added, the operation needs to be stopped, and the water treatment agent cannot be continuously added at a constant flow rate. The following description will discuss a flow rate control system capable of continuously supplying a constant flow of a treatment water amount without being limited by the volume of the sealed container 1.

Fig. 12a is a diagram illustrating the structure of the flow control system. As shown in fig. 12a, the flow control system is composed of two non-powered flow control devices, namely non-powered flow control device 10a and non-powered flow control device 10b, and a switching device 50.

The inlet pipe 11a of the non-powered flow control device 10a and the inlet pipe 11b of the non-powered flow control device 10b are connected to the inlet manifold 20.

In non-powered flow control device 10a, inner end opening 22a of plenum 2a is higher than inlet 132a of outlet 13 a. The unpowered flow control device 10b is identical to the unpowered flow control device 10a, with the inner end opening 22b of the stabilivolt 2b higher than the inlet 132b of the effluent pipe 13 b.

Fig. 12b is a control explanatory diagram of the flow rate control device.

As shown in fig. 12b, the switching device 50 is composed of two flow meters 51a, 51b, two valve control modules 52a, 52b, and a switching module 53.

The flow meter 51a detects the flow rate of the water treatment agent fed by the unpowered flow control device 10 a; the valve control module 52a controls the control valve 131a, the inlet valve 111a, and the outlet valve 121a of the non-powered flow control apparatus 10 a.

The flowmeter 51b detects the flow of the water treatment agent fed by the unpowered flow control device 10 b; the valve control module 52b controls the control valve 131b, the liquid inlet valve 111b, and the gas outlet valve 121b of the non-powered flow control apparatus 10 b.

The valve control module 52a and the valve control module 52b have two states of outputting a water treatment agent (output liquid material) and supplementing the water treatment agent (supplement liquid material), and when outputting the water treatment agent, open the control valve of the corresponding unpowered flow control device and close the liquid inlet valve and the exhaust valve. When the water treatment agent is supplemented, the control valve is closed, and the liquid inlet valve and the exhaust valve are opened. When the valve control module 52a is in the water treatment agent output state, the valve control module 52b is in the water treatment agent replenishment state, and vice versa.

The switching module 53 determines a change in the flow rate of the water treatment agent based on the detection values of the flow meters 51a and 51b, and switches the states of the two valve control modules 52a and 52b when the flow rate linearly decreases. For example, when the valve control module 52a is in a state of delivering the water treatment agent, since the liquid surface (see fig. 4 and 5) is above the inner end opening 22a of the surge tank 2a, as described above, the inside of the sealed container 1a is closed by the liquid material, and as the water treatment agent flows out, negative pressure is generated above the liquid surface, air is sucked into the sealed container 1a, the pressure in the sealed container 1 is kept balanced, the pressure at the outlet 130a is constant, and the water treatment agent is fed into the industrial wastewater in a constant flow.

However, when the liquid level drops to the position of the inner end opening 22a of the stabilivolt 2a, the sealed container 1 is directly communicated with the outside air due to the loss of the sealing of the water treatment agent, and the pressure in the sealed container 1a is always maintained at one atmospheric pressure. Then, when the liquid level is lowered, the pressure at the outlet 130 of the liquid outlet pipe 13 is linearly lowered as the liquid level height is lowered, and the flow rate of the water treatment agent is changed from a constant flow to a linear decrease.

When the switching module 53 detects that the flow rate is changed from the constant flow to the linear decrease, the states of the valve control module 52a and the valve control module 52b are switched, so that the valve control module 52a is in a state of replenishing the water treatment agent, and the valve control module 52b is in a state of outputting the water treatment agent.

The method can judge the switching time in time, and adds the water treatment agent to the unpowered flow control device 10a or the unpowered flow control device 10b in the state of supplementing the water treatment agent, thereby utilizing the capability of the unpowered flow control device for providing the constant flow water treatment agent to the maximum extent.

By using the flow control system of the present invention, the water treatment agent can be continuously fed in a constant flow without being limited by the volume of the sealed container (1).

As a modification, the inner end opening 22a of the pressure maintaining tube 2a in the non-powered flow control device 10a may be provided at the same height as the inlet 132a of the liquid outlet tube 13 a. Unpowered flow control device 10b similarly has inner end opening 22b of plenum 2b disposed at the same height as inlet 132b of outlet 13 b.

When the switching module 53 detects that the flow rate of the water treatment agent is zero, the states of the valve control module 52a and the valve control module 52b are switched.

The modification can also continuously feed the water treatment agent at a constant flow without being limited by the volume of the sealed container (1).

Compared with a structure using a pump and a controller, the water treatment agent feeding device has the advantages of low use and maintenance cost and is particularly suitable for places without power supply.

The use of the unpowered flow control device and the flow control device for the delivery of water treatment agents in industrial wastewater treatment has been described above. The non-powered flow control device and the flow control system are not limited to the delivery of the water treatment agent, and can be used as equipment for quantitative metering, quantitative filling and quantitative batching.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (10)

1. The unpowered constant-voltage source device is characterized by comprising a sealed container (1) and a voltage stabilizing tube (2),

the sealed container (1) is used for storing liquid materials, a liquid inlet pipe (11) and an exhaust pipe (12) which are communicated with the inside of the sealed container (1) are arranged at the top of the sealed container, and a liquid outlet pipe (13) which is communicated with the inside of the sealed container (1) is arranged at the bottom of the sealed container;

a liquid inlet valve (111) is arranged in the liquid inlet pipe (11) and used for controlling the opening and closing of the liquid inlet pipe (11), an exhaust valve (121) is arranged in the exhaust pipe (12) and used for controlling the opening and closing of the exhaust pipe (12), and a control valve (131) is arranged in the liquid outlet pipe (13) and used for controlling the opening and closing of the liquid outlet pipe (13);

the pressure stabilizing tube (2) is arranged in the sealed container (1), the outer end of the pressure stabilizing tube penetrates through the wall of the sealed container (1) and extends to the outside to communicate the inside of the sealed container (1) with the atmosphere, the inner end of the pressure stabilizing tube extends to the bottom of the sealed container (1), an opening (22) in the inner end is higher than an outlet (130) of the liquid outlet tube (13), and a height difference (h) is formed between the opening (22) in the inner end and the outlet (130) of the liquid outlet tube (13).

2. The unpowered constant-voltage source device according to claim 1, wherein an inlet (132) of the liquid outlet pipe (13) connected with the sealed container (1) is positioned above the outlet (130), and an inner end opening (22) of the pressure stabilizing pipe (2) is flush with the inlet (132) or positioned below the inlet (132) and above the outlet (130).

3. The unpowered constant-voltage source device as claimed in claim 2, wherein the pressure-stabilizing tube (2) and the liquid outlet tube (13) are circular tubes, and the ratio of the inner diameter (T) of the pressure-stabilizing tube (2) to the inner diameter (T) of the liquid outlet tube (13) is 1.2-1.5: 1.

4. the unpowered constant-pressure source device according to claim 3, wherein the sealed container (1) is in a cylindrical shape with two ends bulging outwards, the exhaust pipe (12) is arranged in the center of the top of the sealed container (1), the pressure maintaining pipe (2) and the liquid inlet pipe (11) are symmetrically arranged on two sides of the exhaust pipe (12), and an outer end opening (21) of the pressure maintaining pipe (2) is higher than the highest point of the top of the sealed container (1).

5. Unpowered constant-voltage source device according to claim 4, characterized in that the outlet pipe (13) is arranged on the wall of the sealed container (1) at a position farthest away from the stabilivolt (2).

6. The unpowered constant-pressure source device according to claim 5, wherein an evacuation pipe (14) and an evacuation valve (17) for controlling the evacuation pipe (14) to open and close are arranged in the center of the bottom of the sealed container (1), a plurality of support legs (15) for supporting are arranged around the evacuation pipe (14), and a communication type liquid level meter (3) communicated with the inside of the sealed container (1) is arranged on the side wall of the sealed container (1).

7. The unpowered constant-voltage source device as claimed in claim 6, wherein the outer end of the stabilivolt (2) is in an inverted L shape or an inverted U shape, and the opening (21) of the outer end is towards the side or downwards.

8. The unpowered constant-voltage source device according to claim 7, wherein the control valve (131) in the outlet pipe (13) has an opening degree adjusting function.

9. The unpowered constant-voltage source device according to any one of claims 1 to 8, wherein the bottom of the sealed container (1) is conical, and the liquid outlet pipe (13) is arranged on the side wall of the conical part.

10. Flow control system, comprising an unpowered constant voltage source device, a switching device according to any one of claims 1 to 9, wherein at least two of the unpowered constant voltage source devices,

the liquid inlet pipe of each unpowered constant-voltage source device is connected with the liquid inlet main pipe, the switching device comprises at least two flowmeters, at least two valve control modules and a switching module,

each flowmeter detects the liquid flow of the corresponding unpowered constant-pressure source device, each valve control module has two states of outputting liquid and supplementing liquid, when the liquid is output, the corresponding control valve of the unpowered constant-pressure source device is opened, when the liquid inlet valve, the exhaust valve and the liquid supplementing state are closed, the control valve is closed, the liquid inlet valve and the exhaust valve are opened, when one valve control module is in the state of outputting liquid, the other valve control module is in the state of supplementing liquid,

the switching module judges the change of the liquid material flow according to the detection value of the flow meter, and switches the states of the two valve control modules when the flow is linearly reduced or zero.

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