Flow adjusting device

Abstract

The utility model discloses a flow adjusting device which comprises a liquid supply pipe and a liquid outlet pipe, a plurality of liquid distribution pipes are communicated between the liquid supply pipe and the liquid outlet pipe, the flow of the liquid distribution pipes is controlled by a flow control valve, the flow adjusting device further comprises a flow detection device used for detecting the flow of the liquid distribution pipes, the liquid distribution pipes are Venturi pipes, and the flow detection device is used for detecting the flow of the liquid distribution pipes. The flow detection device is a pressure difference detector, and the pressure difference detector is used for detecting the relative pressure difference between the liquid inlet end of the Venturi tube and the throat position. According to the utility model, the plurality of liquid distribution pipes are arranged between the liquid supply pipe and the liquid outlet pipe, and the corresponding number of liquid distribution pipes are controlled to supply liquid according to the flow demand, so that the required flow is matched with the flow range of accurate liquid supply of the plurality of liquid distribution pipes, and the flow control response speed is high and the accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of flow control, and particularly relates to a flow regulating device. Background Art

[0002] Generally, a flow regulating device is implemented by a control system of a flowmeter + a regulating valve. The flow data measured at the rear end is compared with the set value to judge the opening degree of the front regulating valve, and a signal is given to the regulating valve. The actuator of the regulating valve performs corresponding opening or closing actions. After the data of the rear flowmeter changes, it is fed back for further adjustment. This adjustment method has a long duration and low accuracy, and the adjustment accuracy drops linearly at large and small flow rates. It is generally applicable to the chemical industry with constant process parameters or low requirements for flow accuracy during long-term operation.

[0003] For industries and fields with high requirements for flow accuracy, short response time requirements, and the same adjustment accuracy under various flow conditions, conventional flow regulating valves cannot meet the requirements. Summary of the Utility Model

[0004] To solve the problems of slow response speed and poor adjustment accuracy of the existing flow regulating device, the utility model provides a flow regulating device, which controls the flow through the combination of multiple independent liquid distribution pipes, so as to achieve fast response speed and high accuracy of flow control.

[0005] The technical solution adopted by the utility model is to design a flow regulating device, which includes a liquid supply pipe and a liquid outlet pipe. A plurality of liquid distribution pipes are connected between the inlet pipe and the outlet pipe. The flow of the liquid distribution pipe is controlled by a flow control valve. The device further includes a flow detection device for detecting the flow of the liquid distribution pipe. The liquid distribution pipe is a Venturi tube, and the flow detection device is a differential pressure detector, which is used to detect the relative differential pressure between the liquid inlet end and the throat position of the Venturi tube.

[0006] In some embodiments, the liquid supply pipe is connected to a disc-shaped front storage cavity, the liquid outlet pipe is connected to a rear storage cavity, and the liquid distribution pipe is connected between the front storage cavity and the rear storage cavity.

[0007] In some embodiments, the liquid distribution pipes are circumferentially and evenly arranged between the front storage cavity and the rear storage cavity.

[0008] In some embodiments, the inner diameter parameters of the plurality of liquid distribution pipes are the same.

[0009] In some embodiments, the throat of each liquid distribution pipe is connected to a common pressure-taking cavity through an independent connecting pipe. A on-off control valve is arranged on the connecting pipe, and the differential pressure detector detects the differential pressure of the pressure-taking cavity relative to the front storage cavity.

[0010] In some embodiments, the throat of each liquid separation tube communicates with a common pressure-taking chamber through an independent connecting pipe, and the differential pressure detector detects the differential pressure of the pressure-taking chamber relative to the pre-storage liquid chamber; a switching valve is arranged in the pressure-taking chamber, and the switching valve controls different connecting pipes to communicate through the pressure-taking chamber.

[0011] In some embodiments, the pressure-taking chamber is a cylindrical chamber, the switching valve includes a piston slidably fitted in the cylindrical chamber, the communication parts of the connecting pipes with the cylindrical chamber are distributed in sequence along the axis direction of the cylindrical chamber, and moving the piston along the axial direction of the cylindrical chamber enables different connecting pipes to communicate with the pressure-taking chamber.

[0012] In some embodiments, the piston is controlled to expand and contract by a linear motor.

[0013] In some embodiments, the flow control valve is located in front of the throat of the Venturi tube.

[0014] In some embodiments, a temperature detection sensor for detecting the temperature of the liquid in the chamber is arranged on the pre-storage liquid chamber.

[0015] Compared with the prior art, the present utility model has the following beneficial effects:

[0016] The present utility model utilizes a plurality of liquid separation tubes arranged between the liquid supply pipe and the liquid discharge pipe, and controls the liquid supply of the corresponding number of liquid separation tubes according to the flow demand, so that the required flow rate matches the flow rate range that can be accurately supplied by several liquid separation tubes, thereby enabling a fast response speed and high accuracy in flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following combines specific embodiments and drawings to describe the present utility model in detail. For showing details and facilitating the understanding of its principle, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0018] Figure 1 is a schematic diagram of Embodiment 1.

[0019] Figure 2 is Figure 1 a schematic diagram of the A-A section of

[0020] Figure 3 is a schematic diagram of the plane of Embodiment 2.

[0021] In the figure, 1 is a liquid supply pipe; 2 is a liquid discharge pipe; 3 is a liquid distribution pipe; 4 is a flow control valve; 5 is a differential pressure detector; 6 is a pre-storage liquid cavity; 7 is a post-storage liquid cavity; 8 is a communication pipe; 9 is an on-off control valve; 10 is a pressure-taking cavity; 11 is a temperature detection sensor; 12 is a piston; 13 is a linear motor; 14 is the connection point between the communication pipe and the cylindrical cavity. Detailed implementation mode

[0022] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following implementation modes do not limit the invention involved in the claims. In addition, all combinations of the features described in the implementation modes are not necessarily required for the solution of the invention.

[0023] The principle and structure of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment 1

[0025] As Figure 1 、 2 shown, a flow regulating device includes a liquid supply pipe 1 and a liquid discharge pipe 2. A plurality of liquid distribution pipes 3 are connected between the liquid inlet pipe and the liquid discharge pipe 2. The liquid supply pipe 1 is connected to a liquid supply device, the liquid discharge pipe 2 is connected to a liquid supply demand device, the flow of the liquid distribution pipe 3 is controlled by a flow control valve 4, and a flow detection device for detecting the flow of the liquid distribution pipe 3 is further included. The flow control valve 4 controls the flow of the liquid distribution pipe 3 according to the detection data of the flow detection device. In this way, through the monitoring of the flow by the detection device, the liquid distribution pipe 3 is controlled to supply a liquid with a precise flow to the liquid discharge pipe 2 in feedback. The adjustable minimum flow of the liquid distribution pipe 3 is less than the minimum flow required by the liquid supply demand device.

[0026] The liquid distribution pipe 3 is a Venturi tube, and the flow detection device is a differential pressure detector 5. The differential pressure detector 5 is used to detect the relative differential pressure between the liquid inlet end and the throat position of the Venturi tube. Since there is a definite functional correspondence between the differential pressure at the liquid inlet end and the throat of the Venturi tube and the flow of the Venturi tube, the flow of the Venturi tube can be determined from the differential pressure data. The flow control valve is located in front of the throat of the Venturi tube to control the liquid entering the Venturi tube.

[0027] When the liquid discharge measuring device requires a large flow, a plurality of the liquid distribution pipes 3 can be controlled to open simultaneously, so as to provide a larger flow for the liquid discharge pipe 2.

[0028] A differential pressure detector is a device used to measure the pressure difference in a fluid system. It typically consists of a sensor and related electronic equipment for monitoring the pressure changes of the fluid in pipelines, containers, or other devices, or the pressure differences at different positions. A differential pressure sensor is the most basic differential pressure detector and is usually used to measure the pressure difference in fluid pipelines. They can operate based on different principles, such as piezoresistive differential pressure sensors, capacitive differential pressure sensors, etc.

[0029] The liquid supply pipe 1 is connected to the disc-shaped front storage cavity 6, the liquid discharge pipe 2 is connected to the rear storage cavity 7, and the liquid distribution pipe 3 is connected between the front storage cavity 6 and the rear storage cavity 7. That is, relatively large storage cavities are connected before and after the liquid distribution pipe 3, and the liquid in the storage cavity can maintain a certain pressure, thereby providing buffering for the liquid supply and avoiding the influence of excessive pressure mutation on the flow rate. The liquid distribution pipes 3 are circumferentially arranged evenly between the front storage cavity 6 and the rear storage cavity 7. In this embodiment, there are six liquid distribution pipes 3, and the six liquid distribution pipes 3 are circumferentially arranged evenly with the center of the storage cavity as the center and are connected to the storage cavity.

[0030] The throat of each liquid distribution pipe 3 is connected to a common pressure-taking cavity 10 through a connecting pipe 8, and a on-off control valve 9 is arranged on the connecting pipe 8. The differential pressure detector 5 detects the differential pressure of the pressure-taking cavity 10 relative to the front storage cavity 6.

[0031] When the on-off control valve 9 on one of the connecting pipes 8 is opened, the throat part of the liquid distribution pipe 3 connected to the connecting pipe 8 is connected to the pressure-taking cavity 10. Therefore, the differential pressure detected by the differential pressure detector 5 is the differential pressure between the liquid distribution pipe 3 and the front storage cavity 6, that is, the differential pressure between the liquid inlet end of the liquid distribution pipe 3 and its throat. Thus, the flow rate of the liquid distribution pipe 3 can be known. Therefore, the flow rates of different liquid distribution pipes 3 can be detected by using one differential pressure detector 5.

[0032] All the liquid distribution pipes 3 in this embodiment have the same model, that is, the inner diameter parameters of the several liquid distribution pipes are the same. The flow control valve 4 is a control valve with only two control states of on and off, that is, the flow rate is the same under the same pressure. Thus, when multiple liquid distribution pipes 3 of the same model are simultaneously connected to the pressure-taking cavity 10, the differential pressure measured by the differential pressure detector 5 is the differential pressure between the liquid inlet end of each liquid distribution pipe 3 and its throat, that is, at this time, the flow rates of each liquid distribution pipe 3 are the same, and the flow rate supplied to the liquid discharge pipe 2 is the total flow rate of these liquid distribution pipes 3. Thus, the monitoring of the flow rate can be realized by using one differential pressure detector 5. Using a control valve with only two control states of on and off to control the flow rate has a simple structure and is convenient to control.

[0033] Embodiment Two

[0034] AsFigure 3 As shown, the throat of each liquid separation tube 3 is connected to a common pressure-taking chamber 10 through a separate connecting pipe 8, and the differential pressure detector 5 detects the differential pressure of the pressure-taking chamber 10 relative to the pre-storage liquid chamber 6; a switching valve is arranged in the pressure-taking chamber 10, and the switching valve controls different connecting pipes 8 to be connected through the pressure-taking chamber 10, playing the role of a switching valve. Therefore, the on-off control valve 9 does not need to be arranged on the connecting pipe 8 to realize the connection of different connecting pipes 8.

[0035] A temperature detection sensor 11 for detecting the temperature of the liquid in the chamber is arranged on the pre-storage liquid chamber to detect the temperature of the liquid.

[0036] The pressure-taking chamber 10 of this embodiment is a cylindrical cavity. The switching valve includes a piston slidably fitted in the cylindrical cavity. The connection points 14 of the connecting pipe and the cylindrical cavity are distributed in sequence along the axis direction of the cylindrical cavity. Moving the piston 12 along the axial direction of the cylindrical cavity enables different connecting pipes to be connected to the pressure-taking chamber, that is, enables the connecting pipe to be connected to the differential pressure detector, so as to realize the detection of the differential pressure of multiple liquid separation tubes at the same time. The piston is controlled to expand and contract by a linear motor 13.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although this text uses some terms more, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention. For the execution order of actions, steps, etc. in the device and method shown in the specification and drawings, as long as there is no specific order limitation, and as long as the output of the previous process is not used in the subsequent process, they can be realized in any order. The similar sequential terms (such as "first", "then", "second", "again", "then", etc.) used for convenience of description do not mean that they must be implemented in such an order.

[0039] Those of ordinary skill in the art should understand that all directional references (e.g., above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to assist the reader's understanding and do not represent (e.g., with respect to position, orientation, use, etc.) a limitation on the scope of the utility model defined by the appended claims. They are only for the convenience of describing this application and simplifying the description. Without contrary indication, these directional terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The directional terms "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.

[0040] For convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. may be used here to describe the spatial position relationship between a device or feature shown in the figures and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation depicted in the figures for the device. For example, if the device in the figures is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0041] In addition, some ambiguous terms (e.g., substantially, certain, generally, etc.) can refer to slight inaccuracies or slight deviations in conditions, quantities, values, dimensions, etc., some of which are within the manufacturing tolerances or variances. It should be noted that using words such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statement, the above words have no special meaning and thus cannot be construed as a limitation on the protection scope of this application.

Claims

1. A flow rate regulating device, comprising a liquid supply pipe and a liquid discharge pipe, characterized in that, A plurality of liquid distribution pipes are connected between the liquid supply pipe and the liquid discharge pipe. The flow rate of the liquid distribution pipes is controlled by flow control valves. Further included is a flow rate detection device for detecting the flow rate of the liquid distribution pipes. The liquid distribution pipes are Venturi tubes, and the flow rate detection device is a differential pressure detector. The differential pressure detector is used to detect the relative differential pressure between the liquid inlet end and the throat position of the Venturi tubes; the throat of each liquid distribution pipe is connected to a common pressure extraction chamber through an independent connecting pipe. The liquid supply pipe is connected to a disc-shaped pre-storage liquid chamber. The differential pressure detector detects the differential pressure of the pressure extraction chamber relative to the pre-storage liquid chamber; a switching valve is arranged in the pressure extraction chamber. The switching valve controls different connecting pipes to be connected through the pressure extraction chamber; the pressure extraction chamber is a cylindrical chamber. The switching valve includes a piston slidably fitted in the cylindrical chamber. The connection points of the connecting pipes and the cylindrical chamber are sequentially distributed along the axis direction of the cylindrical chamber. Moving the piston along the axial direction of the cylindrical chamber enables different connecting pipes to be connected to the pressure extraction chamber; the piston is controlled to expand and contract by a linear motor.

2. The flow rate regulating device according to claim 1, characterized in that The liquid discharge pipe is connected to a post-storage liquid chamber. The liquid distribution pipes are connected between the pre-storage liquid chamber and the post-storage liquid chamber.

3. The flow rate regulating device according to claim 2, wherein The liquid distribution pipes are circumferentially and evenly arranged between the pre-storage liquid chamber and the post-storage liquid chamber.

4. The flow rate regulating device according to claim 1, characterized in that, The inner diameter parameters of a plurality of the liquid distribution pipes are the same.

5. The flow rate regulating device according to claim 1, wherein On-off control valves are arranged on the connecting pipes.

6. The flow rate regulating device according to claim 1, characterized in that The flow control valve is located in front of the throat of the Venturi tube.

7. The flow rate regulating device according to claim 2, characterized in that, A temperature detection sensor for detecting the temperature of the liquid in the chamber is arranged on the pre-storage liquid chamber.

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