CN218066613U - Flow detection structure and gas meter - Google Patents

Abstract

The application relates to a flow detection structure and a gas meter. The flow detection structure comprises a first channel and a second channel, wherein two ends of the second channel are communicated with the first channel, a detection piece for detecting the flow of fluid in the second channel is arranged in the second channel, the flow detection structure further comprises an adjusting piece, and when the flow of fluid in the second channel exceeds the critical value of the effective range of the detection piece, the adjusting piece controls the flow of fluid in the second channel to be maintained at the specific value of the effective range of the detection piece. The beneficial effect of this application does: the flow detection structure can enlarge the detection range of the fluid flow in the first channel, so that the fluid flow in the first channel can be accurately detected.

Description

Flow detection structure and gas meter

Technical Field

The application relates to the technical field of detection, in particular to a flow detection structure and a gas meter.

Background

One prior flow sensing arrangement includes a first channel and a second channel. The two ends of the second channel are communicated with the first channel, and meanwhile, the two ends of the second channel are staggered along the flowing direction of the fluid in the first channel. When fluid flows through the communication between the detection second channel and the first channel, most of the fluid still flows along the first channel, and part of the fluid enters the second channel. And the fluid entering the second channel will eventually return to the first channel from the connection between the other end of the second channel and the first channel. The second channel is provided with a detection part for detecting the fluid flow in the second channel, and the fluid flow in the second channel and the fluid flow in the first channel have a corresponding relation, so that the detection part can simultaneously detect the fluid flow in the first channel.

However, when the fluid flow in the first channel changes to cause the fluid flow in the second channel to exceed the critical value of the effective range of the detection element, even if the fluid flow in the first channel continues to change, as long as the fluid flow in the second channel still exceeds the critical value of the effective range of the detection element, the detection element will not detect the change of the fluid flow in the first channel, so that the fluid flow in the first channel cannot be accurately detected, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

Accordingly, a flow rate detecting structure and a gas meter are needed. The flow detection structure can enlarge the detection range of the fluid flow in the first channel, so that the fluid flow in the first channel can be accurately detected. The gas meter adopting the flow detection structure is safer and more reliable in operation.

The application firstly provides a flow detection structure, including first passageway and second passageway, the both ends of second passageway all with first passageway intercommunication, be provided with the detection in the second passageway fluid flow's detection piece in the second passageway, flow detection structure still includes the regulating part, works as fluid flow surpasss in the second passageway when the critical value of detection piece effective range, the regulating part control fluid flow maintains in the second passageway the specified value of detection piece effective range.

By adopting the technical scheme, when the fluid flow in the second channel does not exceed the critical value of the effective range of the detection piece, the detection piece can detect the change of the fluid flow in the first channel by detecting the change of the fluid flow in the second channel. When the fluid flow in the first channel changes to cause the fluid flow in the second channel to change such that the fluid flow in the second channel exceeds the threshold value of the effective range of the detection member, even if the fluid flow in the first channel continues to change, as long as the fluid flow in the second channel still exceeds the threshold value of the effective range of the detection member, the detection member cannot detect the fluid flow change in the second channel, and naturally cannot detect the fluid flow change in the first channel. At this time, the regulating member controls the flow rate of the fluid in the second passage to be maintained at a specific value of the effective range of the detecting member. At this time, the fluid flow of the first passage may be calculated according to the control parameter of the adjuster. Therefore, the detection range of the fluid flow rate in the first passage can be increased, so that the fluid flow rate in the first passage can be accurately detected.

In one embodiment of the present application, the adjusting member includes a driving portion and a moving portion, and the driving portion drives the moving portion to move so that a partial volume of the moving portion located in the second channel changes.

By adopting the technical scheme, the partial volume of the moving part in the second channel is changed, so that the flowing space of the fluid in the second channel is changed, the flow of the fluid in the second channel is naturally changed, and the flow of the fluid in the second channel can be maintained at the specific value of the effective range of the detection piece.

In one embodiment of the present application, the driving part is located outside the second passage, and the driving part drives the moving part to pass through the second passage to enter the inside of the second passage.

In one embodiment of the present application, the second channel includes a main body and a circuit board, the driving portion is located outside the circuit board, and the moving portion passes through the circuit board to enter the inside of the second channel under the driving of the driving portion.

In one embodiment of the present application, the second channel includes a main body and a circuit board, the driving portion is located outside the main body, and the moving portion passes through the main body into the interior of the second channel under the driving of the driving portion.

In one embodiment of the present application, the moving distance of the fluid when flowing between the detecting member and the regulating member is n, the moving distance of the fluid when flowing from one end of the second channel to the other end of the second channel through the second channel is s, and n/s = 0.15-0.75.

By adopting the technical scheme, if n/s is less than 0.15, the distance between the adjusting piece and the detecting piece is too close, so that the fluid flowing through the detecting piece is not stable enough, and the detection result of the detecting piece is not accurate enough. If n/s is greater than 0.75, the distance between the detecting part and the end part of the second channel is too close, so that the signal of the detecting part can jump up and down due to the turbulent flow of the fluid, and an accurate detection result cannot be obtained. Therefore, n/s =0.15-0.75, the distance between the detecting member and the adjusting member is not too close, and the distance between the detecting member and the end of the second channel is not too close, so that an accurate detection result can be obtained.

In one embodiment of the present application, the moving distance of the fluid when flowing between the detection member and the end of the second channel is m, the moving distance of the fluid when flowing from one end of the second channel to the other end of the second channel through the second channel is s, m/s = 0.25-0.75.

By adopting the technical scheme, the end part of the second channel is communicated with the first channel, so that the fluid can form turbulent flow at the end part of the second channel. If m/s is less than 0.25, the distance between the detecting part and the end part of the second channel is too close, so that the signal of the detecting part can jump up and down due to the turbulent flow of the fluid, and an accurate detection result cannot be obtained. If m/s is greater than 0.75, the distance between the detecting element and one end of the second channel is too far, and the distance between the detecting element and the other end of the second channel is too close, so that an accurate detection result cannot be obtained. Therefore, the distance between the m/s = 0.25-0.75.

In one embodiment of the present application, the second channel includes a main body and a circuit board, and the detection member is attached to an inner side of the circuit board.

By adopting the technical scheme, the circuit board is directly used as a part of the second channel, so that the main body material is saved. At this time, the detecting member can only be used to detect the flow of gas or the flow of liquid that allows the circuit board to operate normally. In one embodiment of the present application, the first channel has an inner diameter greater than an inner diameter of the second channel.

In an embodiment of this application, first passageway carries the section including first transport section, reducing section and the second that communicates in proper order, and the fluid flows through in proper order first transport section reducing section with the second carries the section, the both ends of second passageway respectively with first transport section with the second carries the section intercommunication, the internal diameter of first transport section does not equal the internal diameter of reducing section.

Through adopting above-mentioned technical scheme, the internal diameter of first conveying section is either greater than the internal diameter of reducing section, or is less than the internal diameter of reducing section. When the inner diameter of the first conveying section is larger than that of the reducing section, the flow speed of the reducing section is reduced, so that when the fluid flows into the reducing section from the first conveying section, part of the fluid can enter the second channel. When the inner diameter of the first conveying section is smaller than that of the reducing section, the resistance is increased when the fluid flows into the reducing section from the first conveying section, and part of the fluid can enter the second channel.

In one embodiment of the present application, the inner diameter of the first conveying section is larger than the inner diameter of the reducing section, and the inner diameter of the reducing section is larger than the inner diameter of the second passage.

The application additionally provides a gas meter, including foretell flow detection structure.

Through adopting above-mentioned technical scheme, the gas table operation that adopts this flow detection structure is safe and reliable more.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view illustrating a moving part not entering the second channel in the embodiment of the present application;

FIG. 2 is a schematic structural view of the moving part after entering the second channel in the embodiment of the present application;

fig. 3 is a schematic structural view of the moving part after passing through the main body and entering the interior of the second channel in the embodiment of the present application.

Reference numerals: 100. a first channel; 110. a first conveying section; 120. a diameter-changing section; 130. a second conveying section; 200. a second channel; 210. a main body; 220. a circuit board; 300. a detection member; 400. an adjustment member; 410. a drive section; 420. a moving part.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present application first provides a flow rate detecting structure including a first passage 100, a second passage 200, a detecting member 300, and an adjusting member 400.

Referring to fig. 1, the first passage 100 includes a first conveying section 110, a reducer section 120, and a second conveying section 130, which are sequentially communicated. The fluid flows through the first conveying section 110, the reducer section 120, and the second conveying section 130 in sequence. Both ends of the second passage 200 communicate with the first conveying section 110 and the second conveying section 130, respectively, so both ends of the second passage 200 are displaced along the flow direction of the fluid in the first passage 100. The inner diameter of the first conveying section 110 is larger than that of the variable diameter section 120, and the inner diameter of the variable diameter section 120 is larger than that of the second passage 200. When the inner diameter of the first conveying section 110 is smaller than the inner diameter of the reducing section 120, the resistance of the fluid flowing from the first conveying section 110 into the reducing section 120 increases, and a part of the fluid may enter the second passage 200.

Referring to fig. 1, the second channel 200 includes a body 210 and a circuit board 220. The sensing member 300 is attached to the inner side of the circuit board 220 so that the sensing member 300 is positioned inside the second channel 200, so that the sensing member 300 can sense the flow rate of the fluid in the second channel 200. The circuit board 220 directly serves as a part of the second channel 200, thereby saving the material of the body 210. At this time, the sensing member 300 can only be used to sense the flow of gas or the flow of liquid that allows the circuit board 220 to normally operate. The moving distance of the fluid when flowing between the detecting member 300 and the end of the second channel 200 is m, the moving distance of the fluid when flowing from the end of the second channel 200 communicating with the first conveying section 110 to the end of the second channel 200 communicating with the second conveying section 130 through the second channel 200 is s, and m/s = 0.25-0.75. Specifically, m/s is 0.25, 0.5 or 0.75. In the embodiment shown in fig. 1, the sensing member 300 is a MEMS sensor. The MEMS sensor has the sensing capability of sensing the magnitude of the gas flow, and when the gas flow flowing through the surface of the MEMS sensor changes, an electric signal output by the MEMS sensor correspondingly changes. Therefore, the sensitivity of the MEMS sensor is high. But the effective range of gas flow for MEMS sensors is small. The end of the second channel 200 is in turn in communication with the first channel 100, so that the fluid may create turbulence at the end of the second channel 200. If m/s < 0.25, the distance between the detecting member 300 and the end of the second channel 200 is too close, so that the signal of the detecting member 300 may jump up and down due to the turbulent flow of the fluid, and thus an accurate detection result may not be obtained. If m/s is greater than 0.75, one end of the detecting element 300 is too far away from the second channel 200, and the other end of the detecting element 300 is too close to the second channel 200, so that an accurate detection result cannot be obtained. Therefore, the distance between the detecting member 300 and the two ends of the second channel 200 is not too close to each other for m/s =0.25-0.75, so that the signal of the detecting member 300 is reduced from jumping up and down due to the turbulent flow of the fluid, and accurate detection results can be obtained.

Referring to fig. 1 and 2, the adjusting member 400 includes a driving part 410 and a moving part 420. The driving part 410 is located outside the circuit board 220, and the moving part 420 can pass through the circuit board 220 into the second channel 200. In the embodiment shown in fig. 1, the moving portion 420 is located upstream of the detecting member 300 after passing through the circuit board 220 into the interior of the second passage 200. Meanwhile, the partial volume of the moving part 420 entering the inside of the second passage 200 is changed by the driving of the driving part 410. When the fluid flow in the second channel 200 exceeds the critical value of the effective range of the detecting member 300, the driving part 410 drives the moving part 420 to move, so that the partial volume of the moving part 420 in the second channel 200 changes, thereby controlling the fluid flow in the second channel 200 to be maintained at the specific value of the effective range of the detecting member 300. The specific value can be any value within the effective range of the sensing member 300, but is fixed during normal use of the flow sensing arrangement. The particular value is sized to allow resetting when the flow sensing structure is not beginning normal use. The moving distance of the fluid when flowing between the detecting member 300 and the regulating member 400 is n, and n/s satisfies 0.15-0.75. Specifically, n/s is 0.15, 0.35, 0.55 or 0.75. The driving part 410 may employ a stepping motor, a piezoelectric motor, an electromagnetic relay, or a voice coil motor. If n/s is less than 0.15, the distance between the adjusting member 400 and the detecting member 300 is too close, so that the fluid flowing through the detecting member 300 is not stable enough, and the detection result of the detecting member 300 is not accurate enough. If n/s > 0.75, the distance between the detecting member 300 and the end of the second channel 200 is too close, so that the signal of the detecting member 300 may jump up and down due to the turbulent flow of the fluid, and thus an accurate detection result may not be obtained. Therefore, n/s =0.15-0.75, the distance between the detecting member 300 and the adjusting member 400 is not excessively close, and the distance between the detecting member 300 and the end of the second channel 200 is not excessively close, so that an accurate detection result can be obtained.

The sensing member 300 is capable of detecting a change in the fluid flow in the first passage 100 by detecting a change in the fluid flow in the second passage 200 when the fluid flow in the second passage 200 does not exceed the threshold value of the effective range of the sensing member 300. When the fluid flow change in the first channel 100 causes the fluid flow change in the second channel 200, such that the fluid flow in the second channel 200 exceeds the threshold value of the effective range of the detecting member 300, even if the fluid flow in the first channel 100 continues to change, as long as the fluid flow in the second channel 200 still exceeds the threshold value of the effective range of the detecting member 300, the detecting member 300 cannot detect the fluid flow change in the second channel 200, and naturally, cannot detect the fluid flow change in the first channel 100. At this time, the driving part 410 drives the moving part 420 to move, so that the partial volume of the moving part 420 in the second channel 200 is increased, and thus the flow space of the fluid in the second channel 200 is reduced, and naturally the flow rate of the fluid in the second channel 200 is reduced, so that the flow rate of the fluid in the second channel 200 can be maintained at a specific value of the effective range of the detecting member 300. At this time, the fluid flow rate of the first passage 100 may be calculated according to the moving distance of the moving part 420. When the fluid flow rate in the second channel 200 is changed due to the change of the fluid flow rate in the first channel 100, so that the fluid flow rate in the second channel 200 returns to the effective measuring range of the detecting member 300, the driving portion 410 drives the moving portion 420 to reset, so that the partial volume of the moving portion 420 in the second channel 200 returns to the initial state, and the flow space of the fluid in the second channel 200 returns to the initial state. The driving part 410 stops operating, and at this time, the fluid flow rate of the first passage 100 is obtained again according to the detection result of the detection member 300. Therefore, the detection range of the fluid flow rate in the first passage 100 is increased, so that the fluid flow rate in the first passage 100 can be accurately detected.

An embodiment of the present application additionally provides a gas meter, including foretell flow detection structure. The gas meter adopting the flow detection structure can detect the gas flow change in a wider range, so that the operation of the gas meter is safer and more reliable.

It is understood that, referring to fig. 3, the driving part 410 may be located outside the main body 210 instead of the circuit board 220. At this time, the moving part 420 can pass through the body 210 into the inside of the second passage 200.

It is understood that the moving portion 420 may not be located upstream of the detecting member 300 any more after passing through the circuit board 220, but located downstream of the detecting member 300.

It can be understood that the circuit board 220 is no longer a part of the second channel 200, but the circuit board 220 is disposed outside the second channel 200, and the detecting member 300 is connected to the circuit board 220 through the second channel 200, and at this time, the detecting member 300 can also detect the flow rate of the liquid affecting the normal operation of the circuit board 220.

It is understood that the inner diameter of the first conveying section 110 may also be smaller than the inner diameter of the reducer section 120. When the inner diameter of the first conveying section 110 is smaller than the inner diameter of the reducing section 120, the flow rate of the reducing section 120 is reduced, so that when the fluid flows into the reducing section 120 from the first conveying section 110, part of the fluid enters the second passage 200.

It is understood that the moving part 420 and the circuit board 220 may be sealed, and the moving part 420 and the circuit board 220 may be clearance-fitted to seal the driving part 410 and the circuit board 220. Either way, it is only necessary to ensure that the fluid does not escape from the second passage 200 to the outside.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (12)

1. The utility model provides a flow detection structure, includes first passageway (100) and second passageway (200), the both ends of second passageway (200) all with first passageway (100) intercommunication, be provided with in second passageway (200) and detect detection piece (300) of fluid flow in second passageway (200), its characterized in that: the flow rate detection structure further comprises an adjusting member (400), and when the fluid flow rate in the second channel (200) exceeds the critical value of the effective range of the detection member (300), the adjusting member (400) controls the fluid flow rate in the second channel (200) to be maintained at the specific value of the effective range of the detection member (300).

2. The flow rate detecting structure according to claim 1, characterized in that: the adjusting piece (400) comprises a driving part (410) and a moving part (420), wherein the driving part (410) drives the moving part (420) to move so that the partial volume of the moving part (420) in the second channel (200) is changed.

3. The flow rate detecting structure according to claim 2, characterized in that: the drive portion (410) is located outside the second channel (200), the drive portion (410) driving the moving portion (420) through the second channel (200) to enter inside the second channel (200).

4. A flow rate detecting structure according to claim 3, characterized in that: the second channel (200) comprises a main body (210) and a circuit board (220), the driving part (410) is positioned on the outer side of the circuit board (220), and the moving part (420) penetrates through the circuit board (220) to enter the interior of the second channel (200) under the driving of the driving part (410).

5. A flow rate detecting structure according to claim 3, characterized in that: the second channel (200) comprises a main body (210) and a circuit board (220), the driving part (410) is positioned at the outer side of the main body (210), and the moving part (420) penetrates through the main body (210) to enter the interior of the second channel (200) under the driving of the driving part (410).

6. The flow rate detecting structure according to claim 1, characterized in that: a moving distance of the fluid when flowing between the detecting member (300) and the adjusting member (400) is n, a moving distance of the fluid when flowing from one end of the second passage (200) to the other end of the second passage (200) through the second passage (200) is s, and n/s = 0.15-0.75.

7. The flow rate detecting structure according to claim 1, characterized in that: a moving distance of the fluid when flowing between the detecting member (300) and the end of the second channel (200) is m, a moving distance of the fluid when flowing from one end of the second channel (200) to the other end of the second channel (200) through the second channel (200) is s, and m/s = 0.25-0.75.

8. The flow rate detecting structure according to claim 1, characterized in that: the second channel (200) includes a main body (210) and a circuit board (220), and the sensing member (300) is coupled to an inner side of the circuit board (220).

9. The flow rate detecting structure according to claim 1, characterized in that: the inner diameter of the first channel (100) is larger than the inner diameter of the second channel (200).

10. The flow rate detecting structure according to claim 1, characterized in that: the first channel (100) comprises a first conveying section (110), a reducing section (120) and a second conveying section (130) which are communicated in sequence, fluid flows through the first conveying section (110), the reducing section (120) and the second conveying section (130) in sequence, two ends of the second channel (200) are communicated with the first conveying section (110) and the second conveying section (130) respectively, and the inner diameter of the first conveying section (110) is not equal to that of the reducing section (120).

11. The flow rate detecting structure according to claim 10, characterized in that: the inner diameter of the first conveying section (110) is larger than that of the reducing section (120), and the inner diameter of the reducing section (120) is larger than that of the second channel (200).

12. A gas meter is characterized in that: comprising a flow sensing structure according to any of claims 1-11.

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