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 pressure source device and flow control system

technical field

The invention relates to a powerless constant pressure source device and a flow control system, in particular to a powerless constant pressure source device and a flow control system for dosing medicine (water treatment agent) in sewage treatment.

Background technique

In the industrial field, it is usually necessary to stabilize the liquid material in the pressure vessel to meet the delivery requirement that the flow rate remains constant when the liquid material is transported outward. For example, in the treatment of industrial wastewater, a constant flow dosing device is usually used to dose pharmaceuticals. Existing constant flow dosing devices are usually constructed using a dosing pump and a controller. For example, the patent number CN200964346Y discloses a liquid constant pressure source device. The liquid constant pressure source device is composed of a pressure stabilization tank, a pressure detection device, a pump and a control box. The surge tank is divided into an upper tank body and a lower tank body. The inner cavity of the upper tank body forms a liquid storage chamber for storing liquid, the lower tank body is connected to the compressed air source through the air inlet, and the inner cavity of the lower tank body forms an air storage chamber. A rubber membrane is installed between the upper tank and the lower tank for isolation.

When a constant flow of liquid is output to the outside, as the liquid level changes, the pressure of the liquid storage chamber decreases, so that the pressure of the air storage chamber is greater than the pressure of the liquid storage chamber. At this time, the pressure of the air storage chamber pushes the rubber membrane of the rubber isolation device upward. Offset, thereby driving the pressure detection device to move upward, the pressure detection device detects the signal that the rubber membrane is shifted upward, that is, detects the signal that the pressure of the liquid storage chamber decreases, controls the fast response hydraulic pump, and injects a certain amount into the liquid storage chamber in time. ensure that the liquid pressure is re-stabilized within the set pressure range and the liquid flow is constant.

Because the liquid constant pressure source device needs to detect the deviation of the rubber membrane and start the hydraulic pump quickly when the deviation occurs, it is not only complicated in structure, but also requires uninterrupted power supply, and has high requirements on the stability of the power supply. In addition, the pump is in direct contact with the agent, which is easy to be corroded and damaged, with short service life and high cost.

With the improvement of environmental protection requirements, wastewater treatment is gradually developing in the direction of "near-zero discharge and resource utilization of industrial wastewater". Different from the centralized post-treatment of wastewater, "near-zero discharge and resource utilization of industrial wastewater" requires the treatment of the generated wastewater at the source. A large number of liquid constant pressure source devices are set up in different areas, which not only consumes huge amounts of power, but also reduces its management and efficiency. Maintenance costs are also huge.

The first object of the present invention is to improve the existing liquid constant pressure source device, and to provide an unpowered constant pressure source device with simple structure, which can realize the outward delivery of constant flow liquid without external power supply.

The second object is to provide a flow control system with a simple structure that can continuously provide a constant flow.

SUMMARY OF THE INVENTION

The first technical solution of the present invention is an unpowered constant pressure source device, which includes a sealed container 1 and a voltage-stabilizing tube 2 . The inside of the sealed container 1 is used to store liquid materials, and a liquid inlet pipe 11 and an exhaust pipe 12 are arranged at the top to communicate with the inside of the sealed container 1 , and a liquid outlet pipe 13 is arranged at the bottom to communicate with the inside of the sealed container 1 .

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

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

Therefore, the liquid material is loaded into the sealed container 1, so that the inner end opening 22 of the pressure-stabilizing tube 2 is immersed in the liquid material. After the filling is completed, the liquid inlet valve 111 and the exhaust valve 121 are closed to keep the sealed container 1 in a closed state. , the liquid material can be output in a constant flow depending on the gravity of the liquid material.

That is, when the control valve 131 is opened, due to the height difference h formed between the inner end opening 22 of the pressure-stabilizing tube 2 and the outlet 130 of the liquid outlet pipe 13, the liquid material flows from the liquid outlet pipe 13 under the action of gravity. The outlet 130 flows out. As the liquid material in the sealed container 1 decreases, the liquid level drops. Since the space in the sealed container 1 is sealed by the liquid material, a negative pressure is generated above the liquid level. When sucked into the sealed container 1, the sucked air offsets the negative pressure generated by the drop of the liquid level, and maintains the pressure balance state in the sealed container 1. The pressure at the outlet 130 of the liquid outlet pipe 13 will not decrease with the drop of the liquid level. The liquid material is output in a constant flow.

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

Since the inner end opening (22) of the surge tube (2) is flush with the inlet (132) or is located below the inlet (132) and above the outlet (130), until the liquid level drops to the liquid outlet The inlet (132) of the pipe (13) can ensure that the pressure at the outlet 130 of the liquid outlet pipe 13 is constant during the entire liquid material output process, and the liquid material is output in a constant flow.

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

When the liquid material flows out, the air enters the sealed container 1 through the pressure-stabilizing tube 2, that is, it is equivalent to replacing the liquid material in the sealed container 1 with external air. If the pressure-stabilizing tube 2 is too thin, the resistance of the air entering the sealed container 1 If it is too large, the flow rate of the liquid material output will become smaller, resulting in insufficient flow rate.

At the same time, when the air enters into the sealed container 1 through the pressure-stabilizing tube 2, due to the surface tension of the liquid material, bubbles are first formed in the liquid material, which float to the liquid surface in the form of bubbles and then are released into the sealed container, that is, the air is Entering into the sealed container 1 in an intermittent state, the pressure-stabilizing tube is too thick, resulting in large air bubbles and large fluctuations in the liquid flow. The ratio of the inner diameter T of the pressure stabilizer tube 2 to the inner diameter t of the liquid outlet pipe 13 is limited to 1.2-1.5:1, which can not only reduce or avoid the reduction of the liquid flow, but also reduce the fluctuation of the liquid flow.

Preferably, the airtight container 1 is in the shape of a cylinder with both ends bulging outwards, the exhaust pipe 12 is arranged in the center of the top of the airtight container 1 , and the voltage stabilizer pipe 2 and the feed pipe 11 are symmetrically arranged at the top of the airtight container 1 . On both sides of the exhaust pipe 12 , the outer end opening 21 of the voltage stabilizer pipe 2 is higher than the highest point of the top of the sealed container 1 .

Since the airtight container 1 has a cylindrical shape with both ends bulging outward, the rigidity of the airtight container 1 is improved, and the storage capacity of the liquid material is also increased. And when adding liquid material, the liquid material will not flow out from the outer end opening 21 of the voltage stabilizer tube 2 .

Preferably, the liquid outlet pipe 13 is arranged on the wall of the sealed container 1 at a position farthest from the voltage stabilizer pipe 2 .

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

Preferably, an emptying pipe 14 and an emptying valve 17 for controlling the opening and closing of the emptying pipe 14 are arranged in the center of the bottom of the sealed container 1 , and a plurality of supporting legs 15 are arranged around the emptying pipe 14 for supporting. , the side wall of the sealed container 1 is provided with a communication type liquid level gauge 3 communicating with the interior of the sealed container 1 .

Therefore, the sediment in the sealed container 1 can be discharged through the emptying pipe 14 . Since the legs 15 raise the height of the sealed container 1 , the outlet 130 of the liquid outlet pipe 13 can be set lower, and the height difference h between the opening 22 at the inner end of the voltage stabilizer pipe 2 and the outlet 130 of the liquid outlet pipe 13 can be increased. , while improving the utilization rate of the inner space of the sealed container 1, the flow rate of the liquid material is increased.

Preferably, the outer end of the voltage stabilizer tube 2 is in an inverted L or inverted U shape, and the outer end opening 21 faces sideways or downwards.

Therefore, it is possible to prevent foreign matter from entering the sealed container 1 through the surge tube 2 and contaminating the liquid material.

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

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

The bottom of the sealed container 1 can be set in a conical shape, and the liquid outlet pipe 13 is set 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 inner space of the airtight container 1 can be further improved.

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

The liquid inlet pipe of each of the unpowered constant pressure source devices is connected to the liquid inlet manifold 20 , and the switching device includes at least two flow meters, at least two valve control modules and switching modules.

Each of the flow meters detects the flow rate of the corresponding liquid material of the unpowered constant pressure source device, and each of the valve control modules has two states of outputting liquid material and replenishing liquid material. When the liquid material state is output, open the corresponding The control valve of the unpowered constant pressure source device, when closing the inlet valve, exhaust valve, and replenishing liquid material, close the control valve, open the inlet valve and exhaust valve, and one of the valve control modules is in the output liquid state. When the material is in the state of replenishing the liquid material, the other valve control module is in the state of replenishing the liquid material.

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

Therefore, when the liquid level in the sealed container is lowered below the opening of the inner end of the pressure-stabilizing tube, when the air directly enters the sealed container without passing through the liquid material, the unpowered constant pressure source device can be switched in time, and it is not limited by the volume of the sealed container. The liquid feed is continuously output at a constant flow.

Description of drawings

Fig. 1 is the front view of unpowered constant source device;

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

Figure 3 is a side view of an unpowered constant source device;

Figure 4 is an illustration diagram of the air bubbles entering the liquid material when a small diameter stabilizer tube is used;

Figure 5 is an illustration diagram of the bubbles entering the liquid material when a thick-diameter pressure-stabilizing tube is used;

Fig. 6a is a structural illustration diagram of the height difference formed between the inner end opening of the stabilizing pipe and the outlet of the liquid outlet pipe;

Fig. 6b is another structural illustration diagram of forming a height difference between the inner end opening of the voltage stabilizer pipe and the outlet of the liquid outlet pipe;

7 is an explanatory diagram of a first modification of the Zener tube;

8 is an explanatory diagram of a second modification of the Zener tube;

FIG. 9 is an explanatory diagram of a modification of the inner end opening of the voltage stabilizer tube;

10 is an explanatory diagram of a third modification of the Zener tube;

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

Fig. 12a is an explanatory diagram of the hardware structure of the flow control system;

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

Detailed ways

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Reference numerals refer to components and techniques in the present invention, so that the advantages and features of the present invention can be more easily understood in a suitable environment. The following description is an embodiment of the claims of the present invention, and other specific implementations related to the claims that are not expressly stated also belong to the scope of the claims.

Hereinafter, the unpowered constant source device of the present invention will be described by taking the injection of chemicals in industrial wastewater treatment as an example.

As shown in FIGS. 1 to 3 , the powerless constant source device is mainly composed of a sealed container 1 and a voltage stabilizer tube 2 . The sealed container 1 is in the shape of a cylinder with both 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, and a liquid outlet pipe 13 is arranged at the bottom, and a control valve 131 is arranged in the liquid outlet pipe 13 . The feed pipe 11 is provided with a liquid feed valve 111 for controlling the opening and closing of the feed pipe 11 , and the exhaust pipe 12 is provided with an exhaust valve 121 for controlling the opening and closing of the exhaust pipe 12 .

In this embodiment, the control valve 131 can not only close the liquid outlet pipe 13 , but also can adjust the opening degree to control the flow rate.

As shown in FIG. 1 , the surge tube 2 is arranged inside the sealed container 1 , and its outer end passes through the wall of the sealed container 1 , extends to the outside, and communicates the inside of the sealed container 1 with the atmosphere. The outer end opening 21 of the surge tube 2 is higher than the inner highest point of the sealed container 1 . The inner end of the stabilizing tube 2 extends downward to the bottom, and the inner end opening 22 is at the same height as the inlet 132 of the liquid outlet pipe 13 , and is higher than the outlet 130 of the liquid outlet pipe 13 .

That is, the liquid outlet pipe 13 is a pipe bent at 90 degrees, the horizontal part is installed on the sealed container 1, the height is the same as the inner end opening 22, the vertical part is bent downward, the outlet 130 and the inner end opening of the voltage stabilizer pipe 2 A height difference h is formed between 22 . The figure only exemplarily shows that the height difference h is formed between the outlet 130 of the liquid outlet pipe 13 and the inner end opening 22 of the stabilizing pipe 2, and the height difference h can be set higher as shown in Figs. Large Flow. When the water treatment agent (liquid material) is added in the sealed container 1, the inner end opening 22 of the pressure stabilizer tube 2 is located below the liquid level of the water treatment agent (see Figures 4 and 5).

The parts that are in contact with the water treatment agent, such as the airtight container 1 and the pressure-stabilizing tube 2, are made of corrosion-resistant materials.

In this embodiment, the stabilizing pipe 2 and the liquid outlet pipe 13 are round pipes, and the inner diameter D of the stabilizing pipe 2 is larger than the inner diameter d of the liquid outlet pipe 13 .

The outer end of the Zener tube 2 is in an inverted L shape, and the outer end opening 21 faces to the side. As a modification example, the outer end of the Zener tube 2 may also be in an inverted U-shape, and the outer end opening 21 faces downward. A voltage-stabilizing valve 211 for controlling the size of the air flow is provided in the outer end of the voltage-stabilizing tube 2 .

When viewed from the front, as shown in FIGS. 1 and 3 , the exhaust pipe 12 is arranged in the center of the top of the sealed container 1 , and the voltage stabilizer pipe 2 and the feed pipe 11 are symmetrically arranged on both sides of the exhaust pipe 12 . Taking the central axis of the airtight container 1 as the center, the liquid outlet pipe 13 is arranged on the opposite side of the voltage stabilizer tube 2 , and maintains a maximum distance from the voltage stabilizer tube 2 .

An emptying pipe 14 and an emptying valve 17 for controlling the opening and closing of the emptying pipe 14 are provided in the center of the bottom of the airtight container 1 . Three supporting legs 15 are provided around the emptying tube 14 . Setting the outriggers 15 also raises the height of the sealed container 1, the outlet 130 of the liquid outlet pipe 13 can be set at a lower position, and the distance h from the inner end opening 22 of the voltage stabilizer pipe 2 can be increased to increase the Flow rate of water treatment agent. The side wall of the sealed container 1 is provided with a communication-type liquid level gauge 3 that communicates with the inside of the sealed container 1 .

In this embodiment, the height of the sealed container 1 is 1600mm high and 1000mm in diameter, the 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 voltage stabilizer pipe 2 is DN50, and the diameter of the discharge pipe is DN50. The diameter of the gas pipe 12 is DN100, and the inner end opening 22 of the stabilizing pipe 2 and the inlet 132 of the liquid outlet pipe 13 are set at a height of about 200 mm from the bottom end of the sealed container 1 .

Since the sealed container 1 is used to store the water treatment agent, and the inner end opening 22 of the stabilizing pipe 2 and the inlet 132 of the liquid outlet pipe 13 are located below the liquid level of the water treatment agent, the inner end opening 22 of the stabilizing pipe 2 and the liquid outlet pipe 13 are located below the liquid level of the water treatment agent. A height difference h is formed between the outlets 130 of the two, so when the inlet valve 111, the exhaust valve 121 and the exhaust valve 17 are closed, the interior of the airtight container 1 is in a closed state.

When adding medicine (outputting liquid material), open the pressure regulator valve 211 and the control valve 131, at this time, 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 drops. Since the space in the sealed container 1 is sealed by the water treatment agent, a negative pressure is generated above the liquid level. Under the action of the negative pressure, the external air passes through the stabilizer tube 2 is sucked into the sealed container 1, the sucked air offsets the negative pressure generated by the drop of the liquid level, maintains the pressure balance in the sealed container 1, and the pressure at the outlet 130 of the liquid outlet pipe 13 will not decrease with the drop of the liquid level, No external power is required, and the water treatment agent can be injected into the treated industrial wastewater in a constant flow.

Since the inner end opening 22 of the voltage stabilizer tube 2 is at the same height as the inlet 132 of the liquid outlet pipe 13, the liquid level drops to the inner end opening 22 of the voltage stabilizer tube 2. When the airtight container 1 is connected to the atmosphere, the water treatment agent will not It flows out from the outlet 130 of the liquid outlet pipe 13 . It is ensured that the water treatment agent is always put into the industrial wastewater at a constant flow during the entire dosing process, and there will be no excessive discharge of pollutants caused by insufficient dosage.

As a modified example, the inner end opening 22 of the voltage stabilizer tube 2 can also be arranged below the inlet 132 of the liquid outlet pipe 13 and above the outlet 130 . The pressure at the outlet 130 is constant, and the liquid material is output in a constant flow.

When filling the water treatment agent into the sealed container 1, close the control valve 131 on the liquid outlet pipe 13, and open the liquid inlet valve 111 and the exhaust valve 121, and the water treatment agent is transported from the liquid inlet pipe 11 to the voltage stabilizer pipe 2. Position H above the inner end opening 22 (see Figures 4 and 5).

Due to the liquid inlet pipe 11 and the exhaust pipe 12, the outer end opening 21 of the voltage stabilizer pipe 2 is higher than the highest point of the top of the sealed container 1. When the water treatment agent is added, the water treatment agent will not flow out from the opening of each pipe, ensuring that security.

Since the water treatment agent flows out, the air enters the sealed container 1 through the pressure-stabilizing tube 2, that is, it is equivalent to replacing the liquid material in the sealing container 1 with external air, and the inner diameter D of the pressure-stabilizing tube 2 is set larger than that of the liquid outlet pipe. The inner diameter d of 13 can avoid large resistance when air enters and affect the output flow of water treatment agent.

Due to the surface tension of the water treatment agent, when the air enters the sealed container 1 through the voltage stabilizer tube 2, air bubbles are first formed in the liquid material, and the air bubbles float to the liquid surface and rupture and release the air, that is, the air enters the seal in an intermittent state. In the container 1, due to its influence, the flow rate of the water treatment agent will fluctuate greatly. Since the ratio of the inner diameter T of the voltage stabilizer tube 2 to the inner diameter t of the liquid outlet tube 13 is limited to 1.2-1.5:1, the generation of large air bubbles can be avoided and the fluctuation of the flow rate of the water treatment agent can be reduced.

Figure 4 is an illustration diagram of the air bubbles discharged into the liquid material when a small-diameter pressure stabilizer is used, and Figure 5 is an illustration of the air bubbles discharged into the liquid material when a large-diameter pressure stabilizer is used. 4 and 5 are A-A sectional views of the sealed container 1 in FIG. 2 .

When using a small diameter stabilizer tube 2, as shown in Figure 4, due to the small diameter of the tube, the bubbles generated are small and dense, and when the bubbles float to the liquid surface and rupture, the pressure fluctuation in the sealed container 1 is small.

On the contrary, when a large diameter stabilizer tube 2 is used, due to the large diameter, as shown in Figure 5, the generated air bubbles are large and few, and the pressure fluctuation in the sealed container (1) is large when the air bubbles burst.

Comprehensive consideration, the ratio between the inner diameter T of the voltage stabilizer tube 2 and the inner diameter t of the liquid outlet tube 13 is limited to 1.2-1.5:1, which can balance the resistance effect caused by the too thin pipe diameter and the flow fluctuation caused by the too thick pipe diameter.

Since the flow rate (flow rate) of the water treatment agent depends on the height difference h between the inner end opening 22 of the surge tube 2 and the outlet 130 of the liquid outlet pipe 13 . As shown in Fig. 6a, for example, a hose is used to connect to the liquid outlet pipe 13, and the outlet 130 is moved downward to increase the height difference h between the opening 22 at the inner end of the voltage stabilizer pipe 2 and the outlet 130 of the liquid outlet pipe 13, increasing the height difference h. flow. 6b, by shortening the length of the voltage stabilizer tube 2, the height difference h between the inner end opening 22 of the voltage stabilizer tube 2 and the outlet 130 of the liquid outlet pipe 13 can be increased to achieve the purpose of increasing the flow rate of the water treatment agent. Since the constant flow can only be achieved when the inner end opening 22 of the voltage stabilizer tube 2 is below the liquid surface, compared with the former, the latter is not as good as the former in the utilization of the inner volume of the container.

Modifications of the present invention will be described below.

FIG. 7 is an explanatory diagram of a first modification of the Zener tube. As shown in FIG. 7 , in the first modification, the voltage stabilizer tube 2a is a curved tube, and the rest is the same as the above embodiment. The voltage stabilizer tube 2a can be a square tube, an oval tube or a special-shaped tube with regular or irregular cross-section.

8 is an explanatory diagram of a second modification of the Zener tube. As shown in FIG. 8 , the voltage stabilizer tube 2b penetrates the side wall of the airtight container 1 obliquely and enters the airtight container 1, and the outlet of the voltage stabilizer tube 2b is oblique. 7, since the opening of the surge tube 2b is inclined, air can enter the water treatment agent more easily. When the air enters the sealed container 1 through the surge tube 2b, relatively small air bubbles can be generated. Since the disturbance generated by the small air bubbles is smaller than that of the large air bubbles, the disturbance caused by the air entering the water treatment agent is reduced, and the fluctuation of the flow rate of the water treatment agent is reduced.

FIG. 9 is an explanatory diagram of a modification of the inner end opening of the Zener tube. As shown in FIG. 9 , the inner end opening 22c of the stabilizing tube 2c is closed, and a plurality of holes for air circulation are opened on the tube wall near the inner end opening 22c. The holes can be circular, square, triangular, or other irregular shapes. The area of each hole is greater than or equal to the cross-sectional area of the inner diameter of the Zener tube 2c.

Therefore, when the air enters the sealed container 1 through the surge tube 2c, the formed air bubbles are relatively dispersed and small in volume, thereby reducing the fluctuation of the flow rate of the water treatment agent caused by the disturbance of the air bubbles.

FIG. 10 is an explanatory diagram of a third modification of the Zener tube. As shown in FIG. 10 , the stabilizing tube 2d is an L-shaped tube, the vertical part is located outside the airtight container 1 , and the lateral part is arranged to pass through the side wall of the airtight container 1 laterally or obliquely into the airtight container 1 . The rest of the structure is the same as that of FIG. 1 .

With the above structure, for example, the vertical part of the voltage stabilizer tube 2d can be made of a transparent material, such as acrylic, glass, etc., to replace the communication type liquid level gauge 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 provided on the side wall of the conical bottom, and is provided near the apex of the conical bottom.

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

In the present invention, a pressure-stabilizing tube is arranged in the sealed container 1, and by utilizing the sealing effect of the water treatment agent, the negative pressure generated in the sealed container 1 automatically sucks in air when the liquid level drops, increasing the pressure in the sealed container 1, and offsetting the liquid When the surface drops, the pressure caused by the outlet 130 of the liquid outlet pipe 13 is reduced, and the pressure of the outlet 130 of the liquid outlet pipe 13 is kept stable, so as to achieve the effect of providing a constant flow of water treatment agent without power. By setting the pipe diameter ratio of the pressure stabilizer pipe 2 to the outlet 130 of the liquid outlet pipe 13, the influence of the air entering on the flow rate of the water treatment agent and the flow rate fluctuation caused by it are reduced. It further improves the effect of the unpowered flow control device to inject the water treatment agent in a constant flow.

Due to the whole control process, there is no need for external power or auxiliary power such as a pump and a controller for controlling the flow, and there is no need to consider the power supply when setting it up. The service life is long, the cost is low, and the management and maintenance cost is also low.

It is especially suitable for dosing when treating the generated wastewater at the source, that is, without centralized post-treatment of wastewater, unpowered flow control devices can be installed at different wastewater sources, and the corresponding treatment agent can be selected for the pollutants in the wastewater. Treatment to achieve zero discharge and resource utilization of wastewater. Since the unpowered flow control device of the present invention requires neither power supply nor consumable parts such as pumps, there is no power consumption, management and maintenance are also very simple, and the cost of wastewater treatment is significantly reduced.

The unpowered flow control device of the present invention has been described above by taking the drug injection in industrial wastewater treatment as an example. Due to the volume limitation of the sealed container 1, when adding the water treatment agent, the operation needs to be stopped, and the water treatment agent cannot be continuously injected at a constant flow rate. Hereinafter, a flow control system that can continuously deliver the water treatment dose at a constant flow regardless of the volume of the sealed container 1 will be described.

Fig. 12a is an explanatory diagram of the configuration of the flow control system. As shown in FIG. 12 a , the flow control system is composed of two unpowered flow control devices, ie, the unpowered flow control device 10 a and the unpowered flow control device 10 b , and the switching device 50 .

The liquid inlet pipe 11 a of the unpowered flow control device 10 a and the liquid inlet pipe 11 b of the unpowered flow control device 10 b are connected to the liquid inlet main pipe 20 .

In the unpowered flow control device 10a, the inner end opening 22a of the stabilizing pipe 2a is higher than the inlet 132a of the liquid outlet pipe 13a. The unpowered flow control device 10b is exactly the same as the unpowered flow control device 10a, and the inner end opening 22b of the stabilizing pipe 2b is higher than the inlet 132b of the liquid outlet pipe 13b.

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

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

The flow meter 51a detects the flow rate when the unpowered flow control device 10a injects the water treatment agent; the valve control module 52a controls the control valve 131a, the inlet valve 111a and the exhaust valve 121a of the unpowered flow control device 10a.

The flowmeter 51b detects the flow rate of the water treatment agent injected by the unpowered flow control device 10b; the valve control module 52b controls the control valve 131b, the inlet valve 111b, and the exhaust valve 121b of the unpowered flow control device 10b.

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

The switching module 53 judges the change of the flow rate of the water treatment agent according to 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 decreases linearly. For example, when the valve control module 52a is in the state of outputting the water treatment agent, since the liquid level (see FIGS. 4 and 5 ) is above the inner end opening 22a of the pressure-stabilizing tube 2a, as described above, the interior of the airtight container 1a is closed by the liquid material. When the water treatment agent flows out, a negative pressure is generated above the liquid level, 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 put into the industrial wastewater at a constant flow.

However, when the liquid level drops to the position of the inner end opening 22a of the stabilizing tube 2a, due to the loss of the seal of the water treatment agent, the airtight container 1 is directly connected to the outside air, and the pressure in the airtight container 1a is always maintained at one atmospheric pressure. After that, when the liquid level drops, the pressure at the outlet 130 of the liquid outlet pipe 13 decreases linearly with the decrease of the liquid level height, and the flow rate of the water treatment agent changes from a constant flow to a linear decrease.

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

Through the method of the present invention, the switching timing can be judged in time, the water treatment agent can be added to the unpowered flow control device 10a or the unpowered flow control device 10b in the state of supplementing the water treatment agent, and the unpowered flow control device can be used to the maximum extent to provide constant flow water treatment the ability of the agent.

With the flow control system of the present invention, the water treatment agent can be continuously injected in a constant flow without being restricted by the volume of the sealed container (1).

As a modification example, the inner end opening 22a of the surge tube 2a in the unpowered flow control device 10a may be provided at the same height as the inlet 132a of the liquid outlet tube 13a. Similarly, in the unpowered flow control device 10b, the inner end opening 22b of the surge tube 2b is provided at the same height as the inlet 132b of the liquid outlet pipe 13b.

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

In the modified example, the water treatment agent can be continuously fed in a constant flow without being limited by the volume of the sealed container (1).

Because no external power is required to achieve constant pressure and constant flow of water treatment agent, the use and maintenance costs are lower compared to the structure using a pump and a controller, and it is especially suitable for use in places without power supply.

The unpowered flow control device and the application of the flow control device to the water treatment agent in industrial wastewater treatment have been described above. The unpowered flow control device and flow control system are not limited to the delivery of water treatment agents, but can also be used as equipment for quantitative measurement, quantitative filling and quantitative batching.

It should be noted that the above-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art 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. An unpowered constant pressure source device, characterized in that it comprises a sealed container (1), a voltage stabilizer tube (2), The inside of the sealed container (1) is used for storing liquid material, a liquid inlet pipe (11) and an exhaust pipe (12) are arranged at the top and communicate with the inside of the sealed container (1), and the bottom is arranged with a connection with the sealed container. (1) Internal liquid outlet pipe (13); The liquid inlet pipe (11) is provided with a liquid inlet valve (111) for controlling the opening and closing of the liquid inlet pipe (11), and the exhaust pipe (12) is provided with an exhaust valve (121) for controlling the opening and closing of the liquid inlet pipe (11). In order to control the opening and closing of the exhaust pipe (12), a control valve (131) is provided in the liquid outlet pipe (13) for controlling the opening and closing of the liquid outlet pipe (13); The pressure-stabilizing tube (2) is arranged inside the sealed container (1), and the outer end passes through the wall of the sealed container (1), extends to the outside, and communicates the inside of the sealed container (1) with the atmosphere , the inner end extends to the bottom of the sealed container (1), the inner end opening (22) is higher than the outlet (130) of the liquid outlet pipe (13), and the outlet (130) of the liquid outlet pipe (13) A height difference (h) is formed between them. 2 . The unpowered constant pressure source device according to claim 1 , wherein the inlet ( 132 ) connecting the liquid outlet pipe ( 13 ) with the sealed container ( 1 ) is located between the outlet ( 130 ). 3 . Above, the inner end opening (22) of the voltage stabilizer tube (2) is flush with the inlet (132) or is located below the inlet (132) and above the outlet (130). 3. The unpowered constant voltage source device according to claim 2, characterized in that, the voltage stabilizer tube (2) and the liquid outlet pipe (13) are round pipes, and the voltage stabilizer tube (2) has a The ratio of the inner diameter (T) to the inner diameter (t) of the liquid outlet pipe (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 the shape of a cylinder with both ends bulging outward, and the exhaust pipe ( 12 ) is provided with the In the top center of the sealed container (1), the voltage stabilizer pipe (2) and the liquid inlet pipe (11) are symmetrically arranged on both sides of the exhaust pipe (12). The outer end opening (21) is higher than the highest point of the top of the sealed container (1). 5 . The unpowered constant pressure source device according to claim 4 , wherein the liquid outlet pipe ( 13 ) is arranged on the wall of the sealed container ( 1 ), at a distance from the voltage stabilizer pipe ( 2 ). 6 . farthest location. 6. The unpowered constant pressure source device according to claim 5, characterized in that, an emptying pipe (14) is arranged in the center of the bottom of the sealed container (1) and the opening of the emptying pipe (14) is controlled. A closed emptying valve (17), a plurality of legs (15) for supporting are arranged around the emptying pipe (14), and a side wall of the sealed container (1) is provided with the sealed container (1) Connected liquid level gauge (3) connected internally. 7 . The unpowered constant voltage source device according to claim 6 , wherein the outer end of the voltage stabilizer tube ( 2 ) is in the shape of an inverted L or an inverted U, and the opening ( 21 ) of the outer end faces to the side or to the side. 8 . Down. 8 . The unpowered constant pressure source device according to claim 7 , wherein the control valve ( 131 ) in the liquid outlet pipe ( 13 ) has an opening adjustment function. 9 . 9 . The unpowered constant pressure source device according to claim 1 , wherein the bottom of the sealed container ( 1 ) is conical, and the liquid outlet pipe ( 13 ) is arranged in a conical shape. 10 . on the side wall of the site. 10. A flow control system, characterized in that it comprises the unpowered constant pressure source device and the switching device according to any one of claims 1 to 9, wherein there are at least two unpowered constant pressure source devices, The liquid inlet pipe of each of the unpowered constant pressure source devices is connected to the liquid inlet main pipe, and the switching device includes at least two flow meters, at least two valve control modules and switching modules, Each of the flow meters detects the flow rate of the corresponding liquid material of the unpowered constant pressure source device, and each of the valve control modules has two states of outputting liquid material and replenishing liquid material. When the liquid material state is output, open the corresponding For the control valve of the unpowered constant pressure source device, when the inlet valve, the exhaust valve and the liquid replenishment state are closed, the control valve is closed, and the inlet valve and the exhaust valve are opened, and one of the valve control modules is in the output state. In the state of liquid material, the other valve control module is in the state of replenishing liquid material, The switching module judges the change of the flow rate of the liquid material according to the detection value of the flow meter, and switches the states of the two valve control modules when the flow rate decreases linearly or becomes zero.

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