CN217003099U

CN217003099U - Flow regulating device and gas flow verification system

Info

Publication number: CN217003099U
Application number: CN202123374663.4U
Authority: CN
Inventors: 林曙曦; 林强; 陈教郸; 陈书强; 陈晨; 赵百武
Original assignee: TANCY INSTRUMENT GROUP CO Ltd
Current assignee: TANCY INSTRUMENT GROUP CO Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-19
Anticipated expiration: 2031-12-24

Abstract

The utility model belongs to the technical field of flow verification, and particularly relates to a flow regulating device and a gas flow verification system. According to the flow regulating device provided by the embodiment of the utility model, the flow area of the first sonic nozzle can be changed through the regulating valve, so that the continuous regulation of the gas flow is realized. The stagnation container is arranged behind the first sonic nozzle, the gas gradually enters a stable state after entering the stagnation container and then enters the second sonic nozzle, after the gas reaches a critical flow state through the second sonic nozzle, the mass flow of the gas is stable and unchanged, the mass flow is calculated by utilizing the gas reaching the critical flow state, and the calculation result is more accurate.

Description

Flow regulating device and gas flow verification system

Technical Field

The utility model belongs to the technical field of flow verification, and particularly relates to a flow regulating device and a gas flow verification system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

The gas flow needs to be controlled and adjusted on many occasions in the industries such as metallurgy, chemical engineering, pneumatics and the like. The regulation of the gas flow rate is very important for automatic control. Therefore, the regulating valve has wide application in industry. For the gas flow regulating valve, many researches are made at home and abroad, and the technology is mature.

When the mass flow is calculated after the flow is adjusted by using the adjusting valve, the final calculation of the mass flow also has errors due to the deviation of the machining precision during the manufacturing of the adjusting valve, and the verification work cannot be performed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve the problem that in the prior art, errors exist in mass flow calculation due to the fact that deviation exists in machining accuracy of a regulating valve. The purpose is realized by the following technical scheme:

a first aspect of the present invention provides a flow rate regulating device, including:

adjusting a valve;

the regulating valve is used for changing the flow area of the first sonic nozzle;

a stagnation vessel connected downstream of the first sonic nozzle;

a second sonic nozzle connected downstream of the stagnation vessel.

According to the flow regulating device provided by the embodiment of the utility model, when the fuel gas enters the flow regulating device from the first air inlet, the fuel gas passes through the joint of the two adjacent runners, due to the existence of the flow guide structure, the direct collision between the fuel gas and the flow regulating device can be reduced, the reduction of the flow rate of the fuel gas caused by the collision is avoided, the fuel gas is guided by the fuel gas to quickly enter the metering module, the air flow compression effect is reduced, the air flow stably flows, and the pressure loss is reduced.

In some embodiments of the present invention, the flow regulating device further includes a pressure transmitter, and the stagnation container is provided with a pressure tapping joint, and the pressure transmitter is connected to the pressure tapping joint.

In some embodiments of the present invention, the flow regulating device further includes a temperature transmitter, and the stagnation container is provided with a temperature taking joint, and the temperature transmitter is connected to the temperature taking joint.

In some embodiments of the utility model, the first sonic nozzle includes a first convergent section, a first throat section and a first divergent section arranged in sequence along a flow direction of the medium, and a part of the regulating valve is located in the first convergent section and cooperates with the first convergent section to change a flow area of the first convergent section.

In some embodiments of the present invention, the regulating valve includes a valve body and a cone, the cone is slidably connected in the valve body, the cone includes a regulating section, a transition section and a sealing section which are sequentially arranged along a flow direction of a medium, a part of the regulating section is located in the first converging section, and the regulating section and the first converging section cooperate to change a flow area of the first converging section.

In some embodiments of the utility model, the second sonic nozzle includes a second convergent section, a second throat section, and a second divergent section sequentially arranged in a flow direction of the medium.

In some embodiments of the utility model, the valve body is provided with a guide hole, the outlet of the valve body and the first sonic nozzle are coaxial, the cone is slidably connected in the guide hole, and the length of the sealing section is greater than the sum of the lengths of the guide hole and the adjusting section.

In some embodiments of the present invention, a step surface is disposed between the transition section and the sealing section, and a distance between a starting point of the adjusting section and the step surface is equal to a distance between an inner wall of the valve body and the first throat section.

In some embodiments of the utility model, the regulating valve and the first sonic nozzle, the first sonic nozzle and the stagnation vessel, and the stagnation vessel and the second sonic nozzle are all connected by a flange seal.

A second aspect of the present invention provides a gas flow verification system, including the flow adjustment device in any of the above technical solutions.

The gas flow verification system and the flow regulating device of the embodiment of the utility model have the same advantages, and are not described in detail herein.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic view of a flow rate regulating device according to an embodiment of the present invention.

The reference symbols in the drawings denote the following:

100. a flow regulating device;

1. adjusting a valve; 11. a valve body; 12. a cone; 111. an inlet; 112. an outlet; 113. a guide hole; 114. an inner wall; 121. an adjustment section; 122. a transition section; 123. a sealing section; 124. a step surface;

2. a first sonic nozzle; 21. a first convergence section; 22. a first throat section; 23. a first expansion section;

3. a stagnation vessel; 31. a pressure tapping joint; 32. taking a temperature joint;

4. a second sonic nozzle; 41. a second convergence section; 42. a second throat section; 43. a second expansion section.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative term is intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, a gas flow verification system according to an embodiment of the present invention includes a flow regulator 100, where the flow regulator 100 includes a regulating valve 1, a first sonic nozzle 2, a stagnation container 3, and a second sonic nozzle 4, where at least a part of the regulating valve 1 is disposed in the first sonic nozzle 2, the regulating valve 1 is used to change a flow area of the first sonic nozzle 2, the stagnation container 3 is connected downstream of the first sonic nozzle 2, and the second sonic nozzle 4 is connected downstream of the stagnation container 3. The flow area of the first sonic nozzle 2 can be changed by the adjusting valve 1, and the flow of the first sonic nozzle 2 is positively correlated with the flow area of the first sonic nozzle 2, so that the gas flow can be continuously adjusted. The gas passing through the first sonic nozzle 2 has the problems of large gas flow fluctuation and errors in the manufacturing precision of the regulating valve 1, and the deviation of the calculation result is large when the gas is directly used for calculating the mass flow, so the stagnation container 3 is arranged behind the first sonic nozzle 2, the gas gradually enters a stable state after entering the stagnation container 3 and then enters the second sonic nozzle 4, after the critical flow state is reached through the second sonic nozzle 4, the mass flow of the gas is stable and unchanged, the mass flow is calculated by using the gas reaching the critical flow state, the calculation result is more accurate, and the output gas is more stable.

In some embodiments of the present invention, according to the critical flow characteristic of the sonic nozzle, when the gas passes through the sonic nozzle, the throat section of the sonic nozzle can form the critical flow state only under the condition that the pressure ratio of the downstream to the upstream gas flow of the sonic nozzle reaches a certain value, the gas flow reaches the maximum speed, and the mass of the gas flowing through the sonic nozzle also reaches the maximum qm. Using formulas

Calculating the mass flow rate of the gas, wherein qm is the mass flow rate (kg/s) of the gas passing through the second sonic nozzle 4 under actual conditions; a is the cross-sectional area of the throat section of the second sonic nozzle 4 (m 2); c is the discharge coefficient (dimensionless) of the second sonic nozzle 4; c is the critical flow function (dimensionless) of real air; p0 is the absolute stagnation pressure (kPa) of the air before the second sonic nozzle 4; t0 is the absolute stagnation temperature (K) of the air before the nozzle; r is the gas constant of air (J. kmo 1. k 1); m is the molar mass (kg. kmo 1). In this formula, the amounts to be measured are A, P0 and T0, and a is a fixed amount, and the size of the second sonic nozzle 4 may be directly measured. P0 and T0 are variables, P0 is measured by a pressure transmitter, T0 is measured by a temperature transmitter, and since the air flow in the stagnation container 3 is in a stable state, the pressure and temperature measured at this point are more accurate, therefore, the flow regulating device 100 further comprises a pressure transmitter, as shown in fig. 1, a pressure taking connector 31 is arranged on the stagnation container 3, and the pressure transmitter is connected to the pressure taking connector 31. The pressure transmitter and the pressure tapping connector 31 are detachably connected, so that the pressure transmitter can be conveniently overhauled and replaced. The flow regulator 100 further comprises a temperature transmitter, as shown in fig. 1, the stagnation container 3 is provided with a temperature taking connector 32, and the temperature transmitter is connected to the temperature taking connector 32. The temperature transmitter and the temperature taking connector 32 are detachably connected, so that the temperature transmitter is convenient to overhaul and replace.

In some embodiments of the utility model, the regulating valve 1 may be a ball valve, a diaphragm valve or a shutter valve. The first method is to change the opening degree of the regulating valve 1, the opening degree of the regulating valve 1 is positively correlated with the flow rate, the regulating valve 1 can be a ball valve, a louver valve or a diaphragm valve, the regulating valve 1 is positioned outside the first sonic nozzle 2, and the regulation of the gas flow rate is completed before the gas enters the first sonic nozzle 2; secondly, change the size in space between governing valve 1 and the first sonic nozzle 2, change the flow area's that forms between governing valve 1 and the first sonic nozzle 2 size promptly, the flow area's size is positive correlation with the size of flow, and governing valve 1 can be the ball valve, and partial governing valve 1 is located within first sonic nozzle 2, accomplishes the regulation to gas flow when gas gets into first sonic nozzle 2.

In some embodiments of the present invention, in one embodiment, the flow rate is adjusted by changing the size of the flow area formed between the regulating valve 1 and the first sonic nozzle 2. Specifically, as shown in fig. 1, the first sonic nozzle 2 includes a first convergent section 21, a first throat section 22, and a first divergent section 23, which are sequentially arranged along the flow direction of the medium, the first sonic nozzle 2 is a rotating body, the diameter of the first throat section 22 is the smallest, the diameter of the first convergent section 21 is gradually reduced, and when the diameter of the first convergent section 21 is gradually reduced, the surface of the first convergent section 21 may gradually converge along a straight line or may gradually converge along an arc. The diameter of the first expansion section 23 is gradually increased, and the surface of the first expansion section 23 may be gradually expanded along a straight line or along an arc line as the diameter is gradually increased. In one embodiment, the first converging section 21 gradually converges along an arc and the first diverging section 23 gradually diverges along a straight line. The partial regulating valve 1 is located in the first convergent section 21 and cooperates with the first convergent section 21 to change the flow area of the first convergent section 21, the more the part of the regulating valve 1 in the first convergent section 21, the greater the degree of change to the flow area.

In some embodiments of the present invention, the portion of the regulating valve 1 that cooperates with the first converging section 21 may be a sphere, an ellipsoid or a cone 12, and the change in the arc-shaped surface may be used to change the size of the flow area between the regulating valve 1 and the first converging section 21. In one embodiment, as shown in fig. 1, the portion of the regulator valve 1 cooperating with the first convergent section 21 is a cone 12. Specifically, the regulating valve 1 comprises a valve body 11 and a cone 12, the cone 12 is slidably connected in the valve body 11, the cone 12 comprises a regulating section 121, a transition section 122 and a sealing section 123 which are sequentially arranged along the flowing direction of the medium, part of the regulating section 121 is located in a first converging section 21, and the regulating section 121 is matched with the first converging section 21 and a first throat section 22 to change the flow area of the first converging section 21. The adjusting section 121 moves towards the direction close to the first converging section 21, the flow area is reduced, the adjusting section 121 moves towards the direction far away from the first converging section 21, the flow area is increased, and the increase and decrease of the flow area are continuous stepless increase and decrease. The adjusting section 121 can be moved by manual control, and can also be moved automatically by arranging a driving device. In one embodiment, the movement of the adjustment segment 121 is automated by a drive device that employs a motor lead screw nut device, an air cylinder, a hydraulic cylinder, a motor rack and pinion, and the like.

In some embodiments of the present invention, as shown in fig. 1, the second sonic nozzle 4 includes a second convergent section 41, a second throat section 42, and a second divergent section 43, which are sequentially arranged in the flow direction of the medium. The diameter of the second throat section 42 is the smallest, the diameter of the second convergent section 41 is gradually reduced, and the surface of the second convergent section 41 may be gradually converged along a straight line or along an arc when the diameter of the second convergent section is gradually reduced. The diameter of the second expansion section 43 is gradually increased, and the surface of the second expansion section 43 can be gradually expanded along a straight line or along an arc line when the diameter of the second expansion section is gradually increased. In one embodiment, the second converging section 41 gradually converges along an arc and the second diverging section 43 gradually diverges along a straight line.

In some embodiments of the present invention, as shown in fig. 1, the valve body 11 is provided with a guide hole 113, the outlet 112 of the valve body 11 and the first sonic nozzle 2 are coaxial, the cone 12 is slidably connected in the guide hole 113, one end of the cone 12 is located in the first converging section 21, and the other end of the cone 12 is exposed out of the valve body 11 through the guide hole 113. The length of the sealing segment 123 is greater than the sum of the lengths of the guide hole 113 and the adjusting segment 121 to ensure that the cone 12 can reach a maximum stroke and a minimum stroke, the flow area is minimum at the maximum stroke, and the flow area is maximum at the minimum stroke.

In some embodiments of the present invention, as shown in fig. 1, a step surface 124 is provided between the transition section 122 and the seal section 123, and the step is mainly considered for positioning between the cone 12 and the valve body 11. To ensure that the reference position of the cone 12 is accurately located, the distance between the starting point of the adjustment segment 121 and the step surface 124, i.e., the sum of the lengths between the adjustment segment 121 and the transition segment 122, is equal to the distance between the inner wall 114 of the valve body 11 and the first throat section 22.

In some embodiments of the present invention, as shown in fig. 1, the inlet 111 and the outlet 112 of the valve body 11 are not collinear, and the inlet 111 may be perpendicular to the outlet 112, or may be at an acute or obtuse angle.

In some embodiments of the present invention, as shown in fig. 1, the regulating valve 1 and the first sonic nozzle 2, the first sonic nozzle 2 and the stagnation vessel 3, and the stagnation vessel 3 and the second sonic nozzle 4 are all connected in a sealing manner by flanges, and the flanges can be applied to pipelines of different sizes, and are sealed to prevent gas leakage and ensure accuracy in calculating mass flow.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A flow regulating device, comprising:

adjusting a valve;

the first sonic nozzle is at least partially arranged in the first sonic nozzle, and the regulating valve is used for changing the flow area of the first sonic nozzle;

a stagnation vessel connected downstream of the first sonic nozzle;

a second sonic nozzle connected downstream of the stagnation vessel.

2. The flow regulating device of claim 1, further comprising a pressure transmitter, wherein the stagnation vessel is provided with a pressure tap, and wherein the pressure transmitter is connected to the pressure tap.

3. The flow regulating device according to claim 1, further comprising a temperature transmitter, wherein a temperature taking joint is disposed on the stagnation container, and the temperature transmitter is connected to the temperature taking joint.

4. A flow regulating device according to claim 1, characterized in that the first sonic nozzle comprises, in succession in the direction of flow of the medium, a first converging section, a first throat section and a first diverging section, part of the regulating valve being located in the first converging section and cooperating with the first converging section to vary the flow area of the first converging section.

5. A flow regulating device according to claim 4, characterized in that the regulating valve comprises a valve body and a cone, the cone is slidably connected in the valve body, the cone comprises a regulating section, a transition section and a sealing section which are arranged in sequence in the flow direction of the medium, part of the regulating section is located in the first converging section, and the regulating section cooperates with the first converging section to change the flow area of the first converging section.

6. The flow regulating device according to claim 1, wherein the second sonic nozzle includes a second converging section, a second throat section, and a second diverging section sequentially arranged in a flow direction of the medium.

7. The flow regulating device of claim 5, wherein the valve body is provided with a guide hole, the outlet of the valve body and the first sonic nozzle are coaxial, the cone is slidably connected in the guide hole, and the length of the sealing section is greater than the sum of the lengths of the guide hole and the regulating section.

8. A flow regulating device according to claim 5, characterized in that a step surface is provided between the transition section and the sealing section, and the distance between the starting point of the regulating section and the step surface is equal to the distance between the inner wall of the valve body and the first throat section.

9. A flow regulating device according to any one of claims 1-8, characterized in that the flanges are sealingly connected between the regulating valve and the first sonic nozzle, between the first sonic nozzle and the stagnation vessel and between the stagnation vessel and the second sonic nozzle.

10. A gas flow verification system comprising a flow regulating device as claimed in any one of claims 1 to 9.