CN117444551B - Manufacturing process and measurement method of a high-precision Venturi flowmeter - Google Patents

Abstract

The invention discloses a manufacturing process and a measuring method of a high-precision venturi flowmeter, wherein the manufacturing process of the high-precision venturi flowmeter comprises the following steps: a ring groove is processed in the venturi tube; processing a metal ring and equally punching four pressure equalizing holes on the surface of the metal ring; embedding a metal ring with a pressure equalizing hole into a groove opening of the ring groove through hydraulic expansion to form a cavity; the communication between each chamber and the external space is not limited to four holes if necessary. The invention has the advantages that: the annular groove is formed in the venturi tube and is combined with hydraulic expansion to press the metal ring at the notch of the annular groove, the metal ring is extruded outwards in real time by utilizing the notch in the venturi tube, so that the metal ring and the main body can be firmly combined, the cavity is internally and externally communicated through four uniform holes, the influence of pulsation on pressure measurement when a measuring medium flows is avoided, the stability of measurement is improved, the measured pressure is converted into a flow signal to be displayed, and the accuracy and the stability of measurement are further improved.

Description

Manufacturing process and measurement method of a high-precision Venturi flowmeter

Technical field

The invention relates to a manufacturing process and a measurement method of a high-precision Venturi flowmeter, and belongs to the technical field of Venturi flowmeters.

Background technique

Venturi flowmeter is a commonly used device for measuring the flow of pressurized pipelines. It is a differential pressure flowmeter and is often used to measure the flow of fluids such as air, natural gas, coal gas, and water.

Generally, a venturi needs to add an annular chamber to improve measurement accuracy. Currently, this annular chamber is set outside the venturi, which has poor pressure-bearing effect and causes unstable flow patterns, which is not conducive to improving measurement accuracy. And the general measurement method , unable to measure more stably and accurately. Therefore, a manufacturing process and measurement method of a high-precision Venturi flowmeter are proposed to address the above problems.

Contents of the invention

The purpose of the present invention is to provide a manufacturing process and measurement method of a high-precision Venturi flowmeter in order to solve the above problems.

The present invention achieves the above object through the following technical solutions, a manufacturing process of a high-precision Venturi flowmeter, the specific process steps are as follows:

Step 1: Process an annular groove inside the venturi tube, and process the angle on the edge of the annular groove based on the relationship between taper and cone angle;

Step 2: Process the metal ring and punch four pressure equalizing holes at equal intervals on its surface. The cross-sectional thickness of the metal ring ranges from 1cm to 2cm;

Step 3: Insert the metal ring with the pressure equalizing hole into the ring groove through hydraulic expansion to form a chamber;

Step 4: There are not limited to four holes connected between the inner and outer spaces of each chamber as needed for installing measuring pressure sensors;

The relationship between the taper C and the cone angle α is C=2×tan(α/2);

The cross-section of the ring groove is a horn-cone shaped structure, and the contact strength between the horn-cone shaped structure and the metal ring is controlled by hydraulic expansion, so that the metal ring and the main body are in firm contact.

Preferably, the pore diameter of the pressure equalizing hole ranges from 8 mm to 10 mm.

Preferably, the venturi tube is not limited to two chambers, each chamber being located at a different diameter of the venturi tube.

A high-precision Venturi flowmeter measurement method. The specific measurement steps are as follows:

S1. The pressure equalizing holes on the metal ring keep the pressure in the chamber in a balanced and stable state. The measuring medium enters the chamber through the four pressure equalizing holes on the metal ring, and the medium pressure is measured at the same time to equalize the pressure;

S2. During measurement, the measured pressure is measured and converted into a flow signal through the differential pressure variable at the pressure equalizing hole and displayed.

The beneficial effects of the present invention are:

1. Set up an annular groove in the venturi tube and combine it with hydraulic expansion to press-fit a metal ring at the notch of the annular groove to form a chamber for measurement, and a pressure equalizing hole is provided on the metal ring to ensure measurement in the chamber. Stability of state;

2. The inner wall of the ring groove is processed according to the relationship between taper and cone angle, so that the internal notch of the venturi tube can be used to squeeze the metal ring outward in real time, so that the metal ring and the main body can be firmly combined;

3. The pressure equalizing hole on the metal ring keeps the pressure in the chamber in a balanced and stable state. The measuring medium flows into the chamber through the four holes on the ring groove. At the same time, the pressure of the medium is measured to equalize the pressure to avoid pulsation when the measuring medium flows. It affects the pressure measurement and improves the stability of the measurement;

4. Through the differential pressure variable at the pressure equalizing hole, the measured pressure is measured and converted into a flow signal for display. In the case of unstable flow conditions, the accuracy and stability of the measurement can be further improved through pressure equalizing conversion. sex.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic structural diagram of the Venturi flowmeter of the present invention;

Figure 2 is an enlarged view of a partial structure of the Venturi flowmeter of the present invention.

In the picture: 1. Venturi tube; 11. Ring groove; 12. Hole; 2. Chamber; 3. Metal ring; 31. Pressure equalizing hole.

Detailed ways

In order to make the purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, what is described below The embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation modes.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

Please refer to Figure 1-2, a manufacturing process of a high-precision Venturi flowmeter, a manufacturing process of a high-precision Venturi flowmeter. The specific process steps are as follows:

Step 1: Process an annular groove 11 inside the venturi tube 1, and process the angle on the edge of the annular groove based on the relationship between the taper C and the cone angle α;

Step 2: Process the metal ring 3 and punch four equalizing holes 31 on its surface at equal intervals. The thickness of the cross-section of the metal ring 3 ranges from 1cm to 2cm;

Step 3: Insert the metal ring 3 with the pressure equalizing hole 31 into the notch of the ring groove 11 through hydraulic expansion to form the chamber 2;

Step 4: There are not limited to four holes 12 provided as needed to communicate between the interior of each chamber 2 and the external space for installing measuring pressure sensors;

The relationship between the taper C and the cone angle α is C=2×tan(α/2);

The cross section of the ring groove 11 is a horn-cone shaped structure, and the contact strength between the horn-cone shaped structure and the metal ring 3 is controlled by hydraulic expansion, so that the metal ring 3 and the main body are in firm contact.

Furthermore, the hole diameter of the pressure equalizing hole 31 ranges from 8 mm to 10 mm.

Furthermore, the venturi tube 1 is not limited to having two chambers 2 , each chamber 2 is located at a different diameter of the venturi tube 1 .

A high-precision Venturi flowmeter measurement method. The specific measurement steps are as follows:

S1. The pressure equalizing holes 31 on the metal ring 3 keep the pressure in the chamber 2 in a balanced and stable state. The measuring medium enters the chamber 2 through the four pressure equalizing holes 31 on the metal ring 3, and the medium pressure is measured at the same time. Equalize the pressure to avoid the impact of pulsation on the pressure measurement when the measurement medium flows, and the stability of the measurement is improved;

S2. During measurement, the measured pressure is measured and converted into a flow signal through the differential pressure variable at the pressure equalizing hole 31 and displayed. In the case of unstable flow conditions, the measured accuracy can be further improved through pressure equalizing conversion. Accuracy and stability.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of the equivalent requirements are included in the present invention. Any reference signs in the claims shall not be construed as limiting the claim in question.

As mentioned above, the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the foregoing. The technical solutions described in each embodiment may be modified, or some of the technical features may be equivalently replaced; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims (4)

1. A manufacturing process for a high-precision Venturi flowmeter, which is characterized by: the specific process steps are as follows: Step 1: Process an annular groove (11) inside the venturi tube (1), and process the angle on the edge of the annular groove according to the relationship between the taper and the cone angle; Step 2: Process the metal ring (3) and punch four pressure equalizing holes (31) at equal intervals on its surface. The cross-sectional thickness of the metal ring (3) ranges from 1cm to 2cm; Step 3: Insert the metal ring (3) with the pressure equalizing hole into the groove of the ring groove (11) through hydraulic expansion to form the chamber (2); Step 4: There are not limited to four holes (12) provided as needed to communicate between the inner and outer spaces of each chamber (2) for installing measuring pressure sensors; The relationship between the taper C and the cone angle α is C=2×tan(α/2); The cross section of the ring groove (11) is a horn-cone shaped structure, and the contact strength between the horn-cone shaped structure and the metal ring (3) is controlled by hydraulic expansion, so that the metal ring (3) is in firm contact with the main body. 2. The manufacturing process of a high-precision Venturi flowmeter according to claim 1, characterized in that: the aperture range of the pressure equalizing hole (31) is a hole diameter of 8 mm to 10 mm. 3. The manufacturing process of a high-precision venturi flowmeter according to claim 1, characterized in that: the venturi tube (1) is not limited to two chambers (2), and each chamber is (2) are located at different diameters of the venturi tube (1). 4. According to the manufacturing process of a high-precision Venturi flowmeter according to any one of claims 1-3, a measurement method of a high-precision Venturi flowmeter is obtained, which is characterized in that: the specific measurement steps are as follows: S1. The pressure equalizing holes (31) on the metal ring (3) keep the pressure in the chamber in a balanced and stable state. The measuring medium enters the chamber (2) through the four pressure equalizing holes (31) on the metal ring (3). ), measure the medium pressure at the same time to equalize the pressure; S2. During measurement, the measured pressure is measured and converted into a flow signal through the differential pressure variable at the pressure equalizing hole (31) and displayed.