CN214149442U

CN214149442U - Acceleration rate flow detection device

Info

Publication number: CN214149442U
Application number: CN202120489096.8U
Authority: CN
Inventors: 张军
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-08
Filing date: 2021-03-08
Publication date: 2021-09-07
Anticipated expiration: 2031-03-08

Abstract

The utility model provides an acceleration rate flow measurement, include: the device comprises a contraction section, a speed increasing section, a positive pressure guiding channel and a negative pressure guiding channel; the outlet of the contraction section is communicated with the speed increasing section; the malleation is drawn and is pressed the drawing of passageway and press the entrance point that the mouth is in shrink section or shrink section, the negative pressure is drawn and is pressed the drawing of passageway and press the mouth and be in acceleration rate section, the utility model provides an acceleration rate flow detection device has solved the problem that current detection device detects the low flow accuracy of low velocity of flow fluid well.

Description

Acceleration rate flow detection device

Technical Field

The utility model belongs to the technical field of flow measurement technique and specifically relates to an acceleration rate flow measurement device is related to.

Background

In the production process of an enterprise, flow data (airflow m3/h and liquid t/h) of various fluids are important basis for guiding production; the flow detection of large-caliber fluid is generally carried out by a bar-type flowmeter, a high-pressure area is formed at the front end of the bar-type flowmeter, a low-pressure area is formed at the side of the bar-type flowmeter, and the flow can be calculated by detecting the differential pressure value of the high-pressure area and the low-pressure area.

However, the differential pressure value of the existing bar-type flowmeter is low when measuring low-speed fluid, the accuracy of flow data can be directly influenced when the differential pressure value is low, and even when the low-speed fluid is measured, the pipeline needs to be subjected to reducing treatment, so that the pipe loss is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides an acceleration rate flow measurement device aims at solving the problem that current detection device detects the low-velocity of flow fluidic flow accuracy is low.

The utility model provides an acceleration rate flow measurement, include: the device comprises a contraction section, a speed increasing section, a positive pressure guiding channel and a negative pressure guiding channel; the outlet of the contraction section is communicated with the speed increasing section; the pressure guiding port of the positive pressure guiding channel is positioned at the inlet end of the contraction section or the contraction section, and the pressure guiding port of the negative pressure guiding channel is positioned at the speed increasing section.

Furthermore, the contraction section is conical, and the speed increasing section is a straight channel; the diameter of the outlet of the contraction section is equal to that of the inlet of the speed increasing section.

Furthermore, the contraction section is in a step shape, and the speed increasing section is a straight channel; the diameter of the outlet of the contraction section is equal to the diameter of the inlet of the speed increasing section.

Furthermore, the speed-increasing flow rate detection device comprises two drainage plates which are intersected at the fluid flow direction part; the contraction section is formed between the two drainage plates; the speed increasing section is of a porous structure, and the porous structure is arranged in the middle of the joint of the two drainage plates.

Further, the speed-increasing flow rate detection device further comprises a steel pipe; the positive pressure guiding channel and the negative pressure guiding channel are arranged inside the steel pipe; the bottom of the steel pipe is fixedly connected with the contraction section, the bottom of the steel pipe extends downwards to form a dust guard, and the bottom end of the dust guard is located below the pressure leading port.

Furthermore, the acceleration flow rate detection device comprises two symmetrically arranged drainage plates, and a first acceleration plate is connected between the two drainage plates; the two drainage plates and the first speed increasing plate jointly form the contraction section; the speed increasing section is of a hole-shaped structure, and the hole-shaped structure is formed in the first speed increasing plate on the right side.

Further, the speed-increasing flow rate detection device comprises a positive pressure chamber, a negative pressure chamber, a contraction plate and a second speed-increasing plate; the contraction plate is obliquely arranged and is connected with the side wall of the negative pressure chamber through a second speed increasing plate, and the side wall of the negative pressure chamber, the contraction plate and the second speed increasing plate form a contraction section together; the hole-shaped structures are arranged on the second speed increasing plate and are at the same height as the negative pressure holes, and the number of the hole-shaped structures is the same as that of the negative pressure holes.

Furthermore, positive pressure holes are formed in the side, opposite to the fluid, of the positive pressure chamber, the number of the positive pressure holes is the same as that of the negative pressure holes, negative pressure holes are formed in the side, close to the contraction plate, of the negative pressure chamber, and the negative pressure holes correspond to the hole-shaped structures in the second speed increasing plate in an angle of 90 degrees.

The utility model provides a pair of acceleration rate flow measurement device, the fluid accelerates through the shrink section, the measurement process after the acceleration rate is accomplished to the last process acceleration section, and form the fluid acceleration district at the shrink section, the acceleration section is the fastest region of body velocity of flow, the fluid velocity that is located the fluid acceleration district increases, lead to the static pressure to reduce, and the fluid velocity of flow of shrink section entrance is unchangeable, under the unchangeable condition of pressure, static pressure difference value between shrink section and the acceleration section district can increase because of the increase of fluid velocity of flow, draw pressure passageway and negative pressure through the malleation at last and draw pressure passageway to derive the positive and negative differential pressure of flow and show the pressure differential conversion, and then increase flow data measurement's accuracy, still need not carry out the reducing processing to the pipeline, increase the pipe loss, the problem that current detection device detects the flow accuracy and hangs down has been solved well.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a structure of a speed-increasing flow rate detecting device provided in embodiment 1 of the present invention;

fig. 2 is a cross-sectional view of the structure of the acceleration flow rate detecting device provided in embodiment 2 of the present invention;

fig. 3 is a bottom view of the speed-increasing flow rate detecting device provided in embodiment 3 of the present invention;

fig. 4 is a sectional view of the acceleration flow rate detecting device according to embodiment 3 of the present invention;

fig. 5 is a right side view of the speed-increasing flow rate detecting device provided in embodiment 3 of the present invention;

fig. 6 is a left side view of the speed-increasing flow rate detecting device provided in embodiment 3 of the present invention;

fig. 7 is a bottom view of the speed-increasing flow rate detecting device provided in embodiment 4 of the present invention;

fig. 8 is a B-B sectional view of the speed-increasing flow rate detecting device provided in embodiment 4 of the present invention;

fig. 9 is a cross-sectional view of an acceleration flow rate detecting device according to embodiment 5 of the present invention;

fig. 10 is a rear view of the speed-increasing flow rate detecting device according to embodiment 5 of the present invention;

fig. 11 is an installation schematic view of the speed-increasing flow rate detecting device provided in embodiment 5 of the present invention.

Description of reference numerals:

1 is a contraction section, 11 is a drainage plate, 12 is a first speed increasing plate, 131 is a positive pressure chamber, 132 is a negative pressure chamber, 133 is a contraction plate, 134 is a positive pressure hole, 135 is a negative pressure hole, 137 is a second speed increasing plate, and 14 is a fluid speed increasing region;

21 is a speed increasing section, and 22 is a porous structure;

3, a steel pipe, 31, 32 and 33 are respectively a positive pressure channel, a negative pressure channel and a dust guard;

4 is a pipeline;

the arrows indicate the direction of fluid flow.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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 implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-11, the utility model provides an acceleration rate flow measurement, include: the device comprises a contraction section 1, a speed increasing section, a positive pressure guide channel 31 and a negative pressure guide channel 32; the outlet of the contraction section 1 is communicated with the speed increasing section; the pressure guiding port of the positive pressure guiding channel 31 is positioned at the inlet end of the contraction section 1 or the contraction section 1, and the pressure guiding port of the negative pressure guiding channel 32 is positioned at the fluid speed increasing section.

The fluid acceleration zone 14 is positioned in the contraction section 1, the acceleration section is the region with the fastest fluid flow speed, and the fluid is accelerated in the fluid acceleration zone in the contraction section and is measured after being accelerated by the acceleration section; that is, the constriction acts to accomplish fluid acceleration.

An outlet of the contraction section 1 is communicated with the speed increasing section, and the contraction section 1 is used for increasing the speed of the fluid; the speed increasing section is connected with an outlet of the contraction section 1, and the measurement process after speed increasing is finished through the speed increasing section; the pressure leading port of the positive pressure leading channel 31 is positioned at the inlet end of the contraction section 1 or the inlet end of the contraction section 1, the pressure leading port of the negative pressure drainage channel 32 is positioned at the fluid acceleration section, the positive pressure leading channel 31 and the negative pressure leading channel 32 lead out the pressure and convert and display the pressure difference, and the fluid accelerates in the acceleration flow rate detection device, so that the differential pressure value is increased, and the accuracy of flow rate data is improved.

In the steady fluid flow, the static pressure is small at the place where the flow velocity is large, and the static pressure is strong at the place where the flow velocity is small. This phenomenon is called the "bernoulli effect" and the fluid flow can be obtained by measuring the static pressure difference of different flow velocities in the flow detection device.

The fluid is accelerated by the contraction section, the speed increased by the fluid flowing through the contraction section is larger than the speed reduced by the fluid viscosity on the contraction section, so the aperture of the contraction section is large enough to reduce the viscosity influence of the fluid, and the optimal aperture can be obtained by calculation or experiment.

It should be noted that the pressure types of the fluid led out from the positive pressure leading passage 31 and the negative pressure leading passage 32 are different, wherein the pressure generated by the fluid acting on the pipeline wall vertically is called static pressure, and the force generated by the fluid flow is not applied to the pipeline wall; the pressure generated by the fluid flow is dynamic pressure.

The speed-increasing flow rate detection device can be set to be any structure or any shape, and the flow rate of the fluid can be increased through the inserted contraction section in the speed-increasing flow rate detection device along the flow direction of the fluid, so that the flow rate detection precision can be improved.

Example 1

Referring to fig. 1, the constriction 1 is a cone shape, and the trumpet shape of the constriction 1 is used for increasing the flow speed of the fluid in the constriction 1.

The outlet of the contraction section 1 is communicated with the acceleration section, the acceleration section 21 is composed of a straight pipe, the acceleration section 21 is a straight channel, the inside of the contraction section 1 is a flow velocity acceleration zone 14, the diameter of the outlet of the contraction section 1 is equal to that of the acceleration section 21, fluid enters the acceleration section 21 after the acceleration is finished by the contraction section 1, the fluid is accelerated in the fluid acceleration zone 14, and the acceleration section is a high-speed fluid zone after the acceleration is finished by the contraction section.

The positive pressure leading channel 31 and the negative pressure leading channel 32 are arranged at the top of the speed-increasing flow rate detection device, the pressure leading port of the positive pressure leading channel 31 is positioned at the contraction section 1, the pressure leading port of the negative pressure leading channel 32 is positioned at the speed-increasing section 21, wherein the positive pressure leading channel 31 leads out static pressure and dynamic pressure at the inlet of the contraction section 1, and the negative pressure leading channel 32 leads out static pressure from the speed-increasing section 21.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the static pressure and the dynamic pressure of the fluid at the inlet of the contraction section 1 and the static pressure of the fluid acceleration section 21 is increased due to the increase of the flow velocity of the fluid, and the difference is used for detecting the flow after being led out through the positive pressure leading channel 31 and the negative pressure leading channel 32, and the fluid is accelerated in the acceleration flow detection device, so that the differential pressure value is increased, and the accuracy of flow data is improved.

Example 2

Referring to fig. 2, the contraction section 1 is stepped, and the distance between the upper step and the lower step gradually decreases along the flowing direction of the fluid, so as to increase the flow velocity of the fluid in the contraction section 1; the outlet of the contraction section 1 is communicated with the speed increasing section, and fluid enters the speed increasing section 21 after completing speed increasing from the contraction section 1. The speed increasing section 21 is a straight channel, the inside of the contraction section 1 is a flow speed increasing region 14, the diameter of an outlet of the contraction section 1 is equal to that of the speed increasing section 21, and fluid enters the speed increasing section 21 after completing speed increasing from the contraction section 1 to complete a measuring process after completing speed increasing.

The positive pressure leading channel 31 and the negative pressure leading channel 32 are arranged at the top of the speed-increasing flow detection device, the pressure leading port of the positive pressure leading channel 31 is positioned at the contraction section 1, the pressure leading port of the negative pressure leading channel 32 is positioned at the speed-increasing section 21, wherein the positive pressure leading channel 31 leads out static pressure and dynamic pressure at the inlet of the contraction section 1, and the negative pressure leading channel 32 leads out static pressure from the speed-increasing section 21.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the static pressure and the dynamic pressure of the fluid at the contraction section 1 and the static pressure of the fluid acceleration section 21 is increased due to the increase of the flow velocity of the fluid, and the difference is used for detecting the flow after being led out through the positive pressure leading channel 31 and the negative pressure leading channel 32, and the accuracy of flow data is improved because the fluid is accelerated in the acceleration flow detection device to increase the differential pressure value.

Example 3

Referring to fig. 3-6, the speed-increasing flow rate detecting device includes two flow-guiding plates 11 whose flow directions of the fluid are partially intersected, and the two flow-guiding plates 11 form the contraction section 1 therebetween, and the distance between the two flow-guiding plates 11 is gradually decreased along with the flow direction of the fluid, so as to increase the flow rate of the fluid in the contraction section 1; the angle between the two drainage plates 11 is adjustable, the angle of adjustment is between 8-90 degrees, including 90 degrees, and when the angle between the two drainage plates 11 is 90 degrees, the two intersected drainage plates 11 are of an angle iron structure.

The export of shrink section 1 with acceleration rate section intercommunication, acceleration rate section is poroid structure 22, poroid structure 22 sets up the middle part at two handing-over departments of drainage plate 11, fluid acceleration rate district 14 is located the shrink section 1 that constitutes between two drainage plates, and the fluid flows from the export of shrink section 1, gets into poroid structure 22 after accomplishing the acceleration rate in the fluid acceleration rate district.

The speed-increasing flow rate detection device further comprises a steel pipe 3, and the positive pressure guiding channel 31 and the negative pressure guiding channel 32 are arranged inside the steel pipe 3; the bottom of the steel pipe 3 is fixedly connected with the contraction section 1; the pressure leading port of the positive pressure leading channel 31 is positioned at the inlet end of the contraction section 1, and the pressure leading port of the negative pressure leading channel 32 is tightly attached to the right side of the porous structure 22, wherein the positive pressure leading channel 31 leads out the static pressure of the contraction section 1, and the negative pressure leading channel 32 leads out the static pressure of the porous structure 22.

The bottom of the steel pipe 3 extends downwards to form a dust guard 33, and the bottom end of the dust guard 33 is positioned below the pressure guide port of the positive pressure guide channel 31; the effect of setting the dust-proof plate 33 is: dust can be prevented from entering the positive pressure introduction passage 31.

The lower part (opposite to the pressure leading port) of the contraction section 1 can be provided with a closed baffle head, and the closed baffle head can ensure that the flow velocity of fluid is increased, but dust deposition is increased on the inner wall of the contraction section 1; the lower part of the contraction section 1 is provided with the open gear head, so that the dust deposition on the inner wall of the contraction section 1 can be reduced, but the acceleration effect of the acceleration flow detection device on the fluid can be influenced, and the arrangement can be balanced according to the working condition.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the static pressure of the fluid at the inlet of the contraction section 1 and the static pressure of the porous structure 22 is increased due to the increase of the flow velocity of the fluid, and the fluid is led out through the positive pressure leading channel 31 and the negative pressure leading channel 32 to be used for detecting the flow, and the fluid is accelerated in the acceleration flow detection device to increase the differential pressure value, so that the accuracy of flow data is improved.

Example 4

Referring to fig. 7-8, the speed-increasing flow rate detection device comprises two contraction sections formed by cutting and leaving parts of the drainage plates 11 by using the steel pipe wall, the two drainage plates 11 are symmetrically arranged, a first speed-increasing plate 12 (or called as a contraction section bottom plate) is connected to the fluid flow direction part between the two drainage plates 11, and the two drainage plates 11 and the first speed-increasing plate 12 jointly form the contraction section 1;

the speed increasing section is of a hole-shaped structure 22, the hole-shaped structure 22 is arranged in the middle of the first speed increasing plate 12 on the right side, an outlet of the contraction section 1 is communicated with the speed increasing section, fluid flows in from the contraction section 1 and flows out from the hole-shaped structure 22, and the measurement process after speed increasing is completed in the speed increasing flow detection device.

The speed-increasing flow rate detection device further comprises a steel pipe 3, and the positive pressure guiding channel 31 and the negative pressure guiding channel 32 are arranged inside the steel pipe 3; the fluid accelerating region 14 is positioned in a contraction section formed by the drainage plate 11 and the first accelerating plate 12, and the bottom of the steel tube 3 is fixedly connected with the contraction section 1; the pressure guiding port of the positive pressure guiding channel 31 is positioned at the inlet end of the contraction section 1, the pressure guiding port of the negative pressure guiding channel 32 is tightly attached to the right side of the porous structure 22, wherein the positive pressure drainage channel 31 guides out the static pressure of the contraction section 1, and the negative pressure guiding channel 32 guides out the static pressure of the porous structure 22.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the static pressure of the fluid at the inlet of the contraction section 1 and the static pressure of the porous structure 22 is increased due to the increase of the flow velocity of the fluid, and is led out through the positive pressure leading channel 31 and the negative pressure leading channel 32 to convert and display the differential pressure, so that the fluid is accelerated in the acceleration flow rate detection device to increase the differential pressure value, and the accuracy of flow rate data is improved.

Example 5

Referring to fig. 9 to 11, the speed-increasing flow rate detecting device includes a positive pressure chamber 131, a negative pressure chamber 132, and a contraction plate 133, the contraction plate 133 is disposed obliquely and connected to a side wall of the negative pressure chamber 132 through a second speed-increasing plate 137, and the side wall of the negative pressure chamber 132, the contraction plate 133, and the second speed-increasing plate 137 together form a contraction section 1. The distance between the obliquely arranged constriction plate 133 and the negative pressure chamber 132 is gradually reduced with the flow direction of the fluid for increasing the flow velocity of the fluid in the constriction section 1.

The bottom of the contraction plate 133 is connected with the side wall of the negative pressure chamber 132 through a second speed increasing plate 137, the speed increasing section is of a hole-shaped structure 22, the hole-shaped structure 22 is formed in the second speed increasing plate 137, and fluid flows out of the hole-shaped structure 22 after flowing through the contraction section 1 to complete the measurement process after speed increasing; the positive pressure chamber 131 is provided with a positive pressure hole 134 on the side facing the fluid, and the negative pressure chamber 132 is provided with a negative pressure hole 135 on the side close to the contraction plate 133, wherein the hole-shaped structure 22 and the negative pressure hole 135 have the same height, the positive pressure hole 134, the negative pressure hole 135 and the hole-shaped structure 22 have the same number, and the hole-shaped structure 22 and the negative pressure hole 135 are opposite to each other at 90 degrees.

The fluid accelerating region 14 is located at the contraction section 1, the positive pressure leading channel 31 and the negative pressure leading channel 32 are arranged at the top of the accelerating flow detection device, the pressure leading port of the positive pressure leading channel 31 is located in the positive pressure chamber 131, and the positive pressure chamber is used for equalizing the dynamic pressure and the static pressure of fluid flowing to the positive pressure hole (dynamic pressure and static pressure) 134. The pressure leading port of the negative pressure leading passage 32 is located in a negative pressure chamber 132, and the negative pressure chamber is pressure-equalized by a negative pressure hole (static pressure) 135 vertical to the flow direction of the fluid. The positive pressure channel 31 leads out the dynamic pressure and the static pressure in the positive pressure chamber 131, and the negative pressure channel 32 leads out the static pressure in the negative pressure chamber 132.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the dynamic pressure and static pressure in the fluid positive pressure chamber 131 and the static pressure in the hole-shaped structure 22 increases due to the increase of the flow velocity of the fluid, and is used for detecting the flow after being led out through the positive pressure leading channel 31 and the negative pressure leading channel 32, and the accuracy of the flow data is improved because the fluid is accelerated in the speed-increasing flow detecting device to increase the differential pressure value.

It should be noted that the end of the contraction plate 1 is connected to the side wall of the negative pressure chamber 132 through the second speed increasing plate 137, and therefore, the upper and lower ends of the contraction plate 1 are also fixedly connected to the side wall of the positive pressure chamber 131 through the steel plate, so that the contraction plate 1 is firmly connected to the positive pressure chamber 131, the negative pressure chamber 132 and the second speed increasing plate 137, and further the contraction plate 1 is ensured not to be loosened under the flushing of the fluid, and further the speed increasing effect of the contraction section 1 on the fluid is not affected.

In this embodiment, the operating principle of the acceleration flow rate detecting device is as follows: the difference between the dynamic pressure and the static pressure of the fluid in the positive pressure chamber and the static pressure of the fluid flowing out of the hole-shaped structure 22 after the fluid is accelerated by the contraction section 1 is increased, and the fluid is led out through the positive pressure leading channel 31 and the negative pressure leading channel 32 and then used for detecting the flow, and the fluid is accelerated in the acceleration flow detection device, so that the differential pressure value is increased, and the accuracy of flow data is improved.

Therefore, the utility model provides a pair of acceleration rate flow measurement device, the fluid accelerates through the shrink section, the measurement process after the acceleration rate is accomplished to the last acceleration section, the velocity of fluid flow that is located fluid acceleration rate district increases, lead to pressure reduction, and the velocity of fluid flow of shrink section entrance is unchangeable, under the unchangeable condition of pressure, the pressure difference value between shrink section (or the dynamic pressure and the static pressure of plenum) and the acceleration section can increase, be used for the measuring flow after deriving the positive and negative differential pressure of flow through malleation induced pressure passageway and negative pressure induced pressure passageway at last, and then increase flow data measurement's accuracy, still need not carry out the reducing to the pipeline and handle, increase the pipe loss, the problem that current detection device measuring flow accuracy is low has been solved well.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A speed-increasing flow rate detecting device, comprising: the device comprises a contraction section, a speed increasing section, a positive pressure guiding channel and a negative pressure guiding channel;

the outlet of the contraction section is communicated with the speed increasing section;

the pressure guiding port of the positive pressure guiding channel is positioned at the inlet end of the contraction section or the contraction section, and the pressure guiding port of the negative pressure guiding channel is positioned at the speed increasing section.

2. The speed-increasing flow rate detecting device according to claim 1, wherein said convergent section is tapered, and said speed-increasing section is a straight channel;

the diameter of the outlet of the contraction section is equal to the diameter of the inlet of the speed increasing section.

3. The speed-increasing flow rate detecting device according to claim 1, wherein said constricted section is stepped, and said speed-increasing section is a straight passage;

4. The speed increasing flow rate sensing device according to claim 1, wherein said speed increasing flow rate sensing device comprises two flow-guiding plates intersecting at a fluid flow direction portion;

the contraction section is formed between the two drainage plates;

the speed increasing section is of a porous structure, and the porous structure is arranged in the middle of the joint of the two drainage plates.

5. The speed-increasing flow rate detecting device according to claim 4, further comprising a steel pipe;

the positive pressure guiding channel and the negative pressure guiding channel are arranged inside the steel pipe;

the bottom of steel pipe with shrink section rigid coupling, the bottom downwardly extending of steel pipe is the dust guard, the position of dust guard bottom is located the below of the position of the pressure port of leading of malleation pressure channel.

6. The speed-increasing flow rate detecting device according to claim 1, wherein the speed-increasing flow rate detecting device comprises two symmetrically arranged flow guide plates, and a first speed-increasing plate is connected to a fluid flow direction part between the two flow guide plates;

the two drainage plates and the first speed increasing plate jointly form the contraction section;

the speed increasing section is of a hole-shaped structure, and the first speed increasing plate on the right side is provided with the hole-shaped structure.

7. The speed-increasing flow rate detecting device according to claim 6, further comprising a steel pipe;

8. The speed increasing flow rate detecting device according to claim 1, wherein said speed increasing flow rate detecting device includes a positive pressure chamber, a negative pressure chamber, and a contraction plate;

the contraction plate is obliquely arranged and is connected with the side wall of the negative pressure chamber through a second speed increasing plate, and the side wall of the negative pressure chamber, the contraction plate and the second speed increasing plate form a contraction section together;

the speed increasing section is of a hole-shaped structure, the hole-shaped structure is arranged on the second speed increasing plate and is at the same position as the negative pressure holes in height, and the number of the hole-shaped structure is the same as that of the negative pressure holes.

9. The speed-increasing flow rate detecting device according to claim 8, wherein positive pressure holes are provided in the positive pressure chamber on the side facing the fluid in the opposite direction in the same number as the number of the negative pressure holes, and negative pressure holes are provided in the negative pressure chamber on the side close to the contraction plate in correspondence to 90 ° of the hole-like structure of the second speed-increasing plate.