CN211317419U - An open-use channel variable diameter pendulum rod flowmeter - Google Patents

Abstract

A diameter-variable swing rod flow meter for an open channel comprises an I-shaped flow measuring support, wherein the I-shaped flow measuring support consists of two longitudinal supports with knob bases and a transverse support with a telescopic structure; the two longitudinal brackets are provided with corresponding middle fixed keys and fixed with transverse brackets; two ends of the transverse bracket with the telescopic structure are provided with fixing knobs for fixing the telescopic structure, and one side of the transverse bracket is provided with a transverse level gauge; the flow meter is simple in structure, high in flow measurement precision, flexible and easy to carry, and suitable for channel flow measurement of various water cross section shapes such as rectangular shapes and U-shaped shapes.

Description

An open-use channel variable diameter pendulum rod flowmeter

technical field

The invention relates to a portable flow measuring instrument, in particular to a portable variable diameter pendulum rod flow measuring instrument used for modern agricultural open channel irrigation.

Background technique

There are many portable flowmeters commonly used in existing irrigation areas. Among them, the flowmeter is mainly based on the flow rate area method. This water measuring device has high measurement accuracy, but it is expensive and inconvenient to monitor water volume information. It can be used in irrigation areas. Check the relationship between water level and flow and monitor the water volume of important sections; although the water measurement method of hydraulic structures is simple and easy to implement, it is labor-intensive and inconvenient for automatic monitoring of water volume information. It is easy to reduce the measurement accuracy and the time limit is short, and the use of special water measuring equipment to measure water can meet the accuracy of water measurement, but it is not easy to popularize.

For the new flow measurement technology proposed this time, the existing similar flow measurement systems include automatic flow measurement systems for inclination open channels and plate flow measurement devices, such as automatic flow measurement systems for inclination open channels, including slots, fixed knobs, brackets, Level meter, angle sensor, current measuring pendulum, power supply module and data controller, this is an automatic current measuring device integrating angle sensor and water level sensor. The problem is that the bracket is not retractable and cannot be changed with the width of the channel, and the pendulum rod is fixed and cannot be replaced, and the appropriate pendulum rod cannot be replaced with the change of flow rate, which has a certain impact on the accuracy of flow measurement. influences.

Another example is the plate-type flow measuring device, including beams, sleeves, gradient plates, angle display plates and goniometer plates. The principle of flow measurement is to use the impulse of the water flow on the goniometer plate to push the goniometer plate to move, according to the goniometer plate. In order to achieve the purpose of flow measurement, the existing problem is that the flow measuring plate is a non-streamlined type, which has a large resistance to the water flow, which affects the flow field of the raw water to a certain extent, thereby affecting the flow measurement accuracy of the device.

SUMMARY OF THE INVENTION

The specific technical problem to be solved by the present invention is the measurement of the flow rate of the open channel passing water section, and the purpose is to provide an open channel variable diameter pendulum rod flowmeter.

In order to achieve the above objects, the present invention adopts the following technical solutions.

An open-use channel variable diameter pendulum rod flowmeter, comprising an I-shaped flow measurement bracket, a knob base, a circuit box, a fixed knob, a longitudinal level, a transverse level, a pendulum rod laying hole, a pendulum rod, a coupling and an angle A sensor; characterized by:

The I-shaped current measuring bracket is composed of two longitudinal brackets with a knob base and a transverse bracket with a telescopic structure; the two longitudinal brackets are provided with corresponding intermediate fixing keys to fix the transverse brackets; the one with The two ends of the horizontal support of the telescopic structure are provided with fixed knobs to fix the extension, and one side is provided with a horizontal level; a circuit box is installed directly above the horizontal support through a hollow stainless steel cuboid; the front of the circuit box is provided with a vertical level; An inverted concave structure frame composed of metal sheets is arranged below the longitudinal level, and two corresponding pendulum rod laying holes are opened on the metal sheets on both sides of the inverted concave structure frame, and the pendulum rod shaft and its pendulum rod are arranged side by side. The shaft of the pendulum is connected with a coupling and an angle sensor on the outer side, which constitutes an open channel variable diameter pendulum rod flowmeter.

的公式：

，其中，M是常数。An open-use channel variable diameter pendulum rod current measuring instrument is characterized in that: the current measuring method of the open-use channel variable diameter swing rod current measuring instrument is to place horizontal horizontal I-shaped flow measuring brackets on both sides of the open-use channel. , and hang the pendulum rod freely to the bottom of the canal, so that the pendulum rod can swing freely. After the channel is filled with water, the pendulum rod swings an angle with the water flow, and the angle sensor displays the angle value corresponding to this flow through the liquid crystal display module. A mathematical model is established with the relationship between the flow rate of the water passing section, that is, a flow rate corresponds to an angle, and finally the flow rate Q and the angle are obtained.

The formula:

, where M is a constant.

Wherein: the swing rod (8) is a cylindrical swing rod, and its swing angle is 0-90°.

The above-mentioned open channel variable diameter pendulum rod flowmeter provided by the present invention, compared with the prior art, utilizes the relationship between the swinging angle of the pendulum rod under the impact of the water flow and the flow rate of the water passing section to establish a mathematical model, That is, a flow corresponds to an angle, and finally an empirical formula is fitted. Through analysis, once the cylindrical pendulum swings, it belongs to the oblique cylindrical flow, and the force it experiences in the water has its own gravity, water buoyancy and water flow resistance. Three, and then use these three moments to achieve equilibrium.

The technical solution provided by the present invention has the advantages of simple measurement method, high precision, low investment cost of current measuring device, overcoming the disadvantage of high cost of traditional current measuring equipment, and the device is scalable and easy to carry, and is suitable for rectangular, U-shaped, etc. Channels with different cross-sectional shapes.

Description of drawings

FIG. 1 is a schematic structural diagram of the variable diameter pendulum rod flow measuring device of the present invention.

Fig. 2 is a flow measurement principle diagram of the present invention.

In the figure: 1-knob base; 2-fixed knob; 3-circuit box; 4-vertical level; 5-horizontal level; 6-I-shaped current measuring bracket; 7-swing rod laying hole; 8-swing rod; 9- coupling; 10- angle sensor.

Detailed ways

The specific embodiments of the present invention are further described in detail below.

Specific implementation of the above-mentioned open channel variable diameter pendulum rod flowmeter provided by the present invention, as shown in FIG. The bracket is composed of a horizontal bracket with a telescopic structure, and the height of the entire bracket can be adjusted through the knob base; the two longitudinal brackets are provided with corresponding intermediate fixing keys 11 to fix the horizontal bracket; the two ends of the horizontal bracket are provided with The fixing knob 2 is used to fix the telescopic part of the horizontal support, and a horizontal level 5 is set on one side. If the level bubble is centered, it means that the horizontal direction has been kept horizontal; on the middle of the horizontal support, a hollow stainless steel cuboid is installed with a circuit box 3 , used to place the circuit and the liquid crystal display screen to prevent the damage of rain and lightning during thunderstorms; the front of the circuit box is provided with a longitudinal level 4, when the level bubble is centered, it means that the bracket has been kept horizontal in the longitudinal direction; There is a metal sheet at the lower position, and there are two swing rod laying holes 7 on the sheet for laying the swing rod; one side of the swing rod 8 is fixed in the coupling 9, and the coupling is connected with the angle sensor 10. Once the swing rod swings At a certain angle, the corresponding angle under a certain flow rate will be displayed on the LCD screen.

The specific operation steps of the variable diameter pendulum rod current measuring device are as follows:

Step 1. After placing the current measuring device on the channel, adjust the height of the four bases according to the horizontal and vertical level to keep the entire support horizontal in the horizontal and vertical directions;

Step 2. After leveling, let the pendulum rod freely hang down to 1mm from the bottom of the canal to ensure that it will not rub against the bottom of the canal and cause unnecessary resistance to affect the flow measurement accuracy. Then manually move the pendulum rod back and forth to make the pendulum rod at In the accompanying drawing 1, the position of the pendulum rod laying hole 7 is tight and suitable;

Step 3. After everything is ready, open the water pump valve to supply water to the channel, and the pendulum will swing to a certain angle with the water flow. At this time, the angle sensor will display the value of the angle corresponding to a certain flow through the liquid crystal display module, which is convenient for operation. Reader intuitively.

Step 4. When the pendulum rod is entangled by the garbage in the water, it must be removed, because it will affect the swing angle of the pendulum rod in the water, thereby affecting the flow measurement accuracy of the entire device.

的公式：

，可以看出这是一种线性关系，其中M是常数。Step 5. Through a lot of experiments, finally get the flow Q and angle

The formula:

, it can be seen that this is a linear relationship, where M is a constant.

In the above-mentioned specific embodiment, the entire stainless steel support of the device is connected by a fixed knob, as shown in Figure 1, and then adjust the base according to whether the two level bubbles in the horizontal and vertical directions are centered, so that the device is horizontal and vertical. Then install the pendulum rod, put the pendulum rod through 7, and connect the angle sensor through the coupling at one end. After sensing that the pendulum rod has a certain angle, the angle sensor will display the angle value through the LCD screen to facilitate reading, The pendulum rod is replaceable, and pendulum rods of different materials, different diameters or different lengths can be installed, depending on the actual situation.

Claims (2)

1. A diameter-variable swing rod flow meter for an open channel comprises an I-shaped flow measuring support, a knob base, a circuit box, a fixed knob, a longitudinal level meter, a transverse level meter, a swing rod lapping hole, a swing rod, a coupling and an angle sensor; the method is characterized in that:

the I-shaped flow measuring bracket (6) consists of two longitudinal brackets with knob bases (1) and a transverse bracket with a telescopic structure; the two longitudinal brackets are provided with corresponding middle fixed keys and fixed with transverse brackets; two ends of the transverse bracket with the telescopic structure are provided with fixing knobs (2) for fixing the telescopic structure, and one side of the transverse bracket is provided with a transverse level (5); a circuit box (3) is arranged right above the transverse bracket through a hollow stainless steel cuboid; a longitudinal level meter (4) is arranged in front of the circuit box (3); an inverted concave structure frame formed by metal sheets is arranged below the longitudinal level (4), two corresponding swing rod carrying holes (7) are formed in the metal sheets on the two sides of the inverted concave structure frame, a swing rod shaft and a swing rod (8) of the swing rod shaft are arranged in parallel, and a coupler (9) and an angle sensor (10) on the outer side of the coupling (9) are connected to one side of the swing rod shaft, so that the open channel variable diameter swing rod flow meter is formed.

2. The open channel reducing pendulum rod flow meter of claim 1, wherein: the swing rod (8) is a cylindrical swing rod, and the swing angle of the swing rod is 0-90 degrees.

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