CN210981386U

CN210981386U - Pitot tube

Info

Publication number: CN210981386U
Application number: CN201922364179.XU
Authority: CN
Inventors: 叶庆树; 宋小林; 赵美成; 唐明云; 安世岗; 聂士斌; 贺安民; 李鹏
Original assignee: China University of Mining and Technology CUMT; Shenhua Shendong Coal Group Co Ltd
Current assignee: China University of Mining and Technology CUMT; Shenhua Shendong Coal Group Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-07-10
Anticipated expiration: 2029-12-25

Abstract

The utility model discloses a pitot tube, pitot tube include body, inlayer pipe, dustcoat and static pressure pipe. The body is hollow, the body is provided with a first side wall and a second side wall which are opposite, a jack is arranged on the second side wall, a full pressure hole is arranged on the first side wall, the inner layer pipe penetrates through the jack and is in sealing connection with the full pressure hole, a static pressure hole is arranged on the side wall between the first side wall and the second side wall on the body, the outer cover is arranged on the body, the static pressure hole is arranged in the outer cover, an air inlet hole is formed in the outer cover, a static pressure pipe is further arranged on the side wall between the first side wall and the second side wall on the body, and air flow entering from the air inlet hole flows to the static pressure pipe through the static pressure hole and. Adopt the utility model discloses, behind the inlet port of turbulent air current entering dustcoat in the pit, owing to not receive exogenic action to become stationary flow air current and get into the static pressure hole, the accuracy of the static pressure value test of having improved, simple structure moreover, convenient to use, the monitoring is with low costs.

Description

Pitot tube

Technical Field

The utility model relates to a measure the device of static pressure value, especially relate to a pitot tube.

Background

At present, pitot tubes are widely used for measuring the wind speed in an underground roadway, and the ventilation resistance of a mine is calculated through the wind speed. However, the underground wind flow belongs to a completely turbulent flow state, the flow direction and the speed of the air flow are disordered, and the flow direction and the speed of the air flow entering the static pressure holes of the pitot tube are also disordered, so that the tested static pressure value is inaccurate. Therefore, how to improve the accuracy of measuring the static pressure value is an urgent problem to be solved in the industry.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a pitot tube to solve the above technical problems.

The utility model provides a pitot tube, include: the device comprises a body, an inner layer pipe, an outer cover and a static pressure pipe;

the body is hollow and is provided with a first side wall and a second side wall which are opposite, the second side wall is provided with an insertion hole, the first side wall is provided with a full pressure hole, and the inner layer pipe penetrates through the insertion hole and is in sealing connection with the full pressure hole;

a static pressure hole is formed in the side wall of the body between the first side wall and the second side wall;

the outer cover is arranged on the body, the static pressure hole is positioned in the outer cover, and an air inlet is formed in the outer cover;

the side wall of the body between the first side wall and the second side wall is also provided with a static pressure pipe, and airflow entering from the air inlet hole flows to the static pressure pipe through the static pressure hole and the inside of the body.

Further, filter and dry particles for filtering and drying dust are filled between the outer cover and the body, and the particle size of the filter and dry particles is larger than the diameter of the static pressure hole.

Further, a groove is formed in the inner wall of the body, and the inner-layer pipe is inserted into the groove and is connected with the full pressure hole in a sealing mode.

Further, the outer cover is a spherical outer cover, and the spherical outer cover is sleeved on the body.

Furthermore, the static pressure holes are at least four, and the static pressure holes are uniformly distributed along the circumferential direction of the body.

Furthermore, the air inlet holes correspond to the static pressure holes one by one, and the hole centers of the air inlet holes are collinear with the hole centers of the corresponding static pressure holes and the sphere centers of the spherical outer covers.

Further, the connection part of the outer cover and the body is rounded.

Further, the cross section of the outer side wall of the body perpendicular to the length direction is circular.

Further, the distance from the static pressure hole to the full pressure hole is more than or equal to 7 times of the diameter of the full pressure hole.

Further, a hanging part for hanging the pitot tube is arranged on the side wall of the body, and the side wall where the hanging part is located is opposite to the side wall where the static pressure tube is located.

The utility model provides a pitot tube is through setting up the body, the inlayer pipe, dustcoat and static pressure pipe, body cavity, be provided with the static pressure hole on it, static pressure pipe and total head hole, the inlayer pipe inserts this internal and total head jogged joint, the air current gets into the inlayer pipe through total head hole, the dustcoat cover is established on the static pressure hole of body, the air current passes the inlet port of dustcoat, through the static pressure hole, the inside flow of body to static pressure pipe, turbulent air current in the pit gets into behind the inlet port of dustcoat, because not receive exogenic action to become stationary flow air current and get into the static pressure hole, the accuracy of the static pressure value test that has improved, moreover, the steam generator is simple in structure, high durability.

Drawings

The objects and advantages of the present invention will be understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a pitot tube according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of I-I in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the following examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Fig. 1 is a schematic structural diagram of a pitot tube according to an embodiment of the present invention. As shown in fig. 1, the utility model provides a pitot tube, include: a body 2, an inner tube 4, an outer cover 6 and a static pressure tube 5.

The body 2 is hollow and is provided with a first side wall 1 and a second side wall 9 which are opposite, the second side wall 9 is provided with a jack, and the first side wall 1 is provided with a full pressure hole 1-1.

The inner layer pipe 4 penetrates through the jack to be hermetically connected with the full pressure hole 1-1, so that air flow in the full pressure hole 1-1 is prevented from entering a hollow structure of the body 2, and the measurement of a static pressure value is influenced.

And static pressure holes 2-1 are formed in the side wall of the body 2 between the first side wall 1 and the second side wall 9.

In a specific embodiment of the present invention, the axis of the static pressure hole 2-1 is perpendicular to the axis of the full pressure hole 1-1, and the static pressure hole 2-1 is disposed near the first side wall 1.

The outer cover 6 is arranged on the body 2, the static pressure hole 2-1 is positioned in the outer cover 6, and the outer cover 6 is provided with an air inlet 3.

The utility model discloses an embodiment, dustcoat 6 can be the cylinder, and dustcoat 6 cavity is established on body 2 to the cover, and the inner wall of dustcoat 6 forms an annular chamber that holds with the outer wall of body 2, and the diameter of the inlet port 3 of seting up on dustcoat 6 is greater than the diameter of static pressure hole 2-1, makes things convenient for the air current to flow in and holds the chamber. The underground turbulent airflow enters the containing cavity through the air inlet holes 3 of the outer cover 6, is not influenced by conditions such as external wind speed and the like, becomes steady-flow airflow and flows into the static pressure holes 2-1.

The side wall of the body 2 between the first side wall 1 and the second side wall 9 is also provided with a static pressure pipe 5, and the airflow entering from the air inlet 3 flows to the static pressure pipe 5 through the static pressure hole 2-1 and the inside of the body 2. The value of the static pressure downhole can be measured by means of the static pressure tube 5.

In this embodiment, the static tube 5 is arranged close to the second side wall 9 of the body 2, communicating with the hollow of the body 2.

When measuring the static pressure value, the pitot tube is placed in the wind flow, and the full pressure hole 1-1 is opposite to the wind flow. When the wind flows through the full pressure hole 1-1, the wind continues to flow backwards, and flows through the outer cover 6, the wind enters the outer cover 6 from the air inlet hole 3 of the outer cover 6, under the condition that no external wind speed influences exist, turbulent airflow is changed into steady flow airflow, the steady flow airflow enters the static pressure hole 2-1 and flows to the static pressure pipe 5 through the inside of the body 2, the influence of the outside on the steady flow airflow in the static pressure pipe 5 is reduced, and the measured static pressure value is more accurate.

Preferably, the housing 6 is a spherical housing, and the spherical housing is sleeved on the body 2. As shown in fig. 1, both ends of the body 2 in the extending direction are located outside the spherical housing.

By arranging the outer cover 6 into a spherical outer cover, the resistance of the outer cover 6 to the airflow direction can be reduced, the vibration of the pitot tube is reduced, and the service life of the pitot tube is prolonged.

Furthermore, the static pressure holes 2-1 are at least four, and the at least four static pressure holes 2-1 are uniformly distributed along the circumferential direction of the body 2, so that more airflow can flow into the body 2, and measurement is facilitated.

Furthermore, the number of the air inlet holes 3 is at least four, the air inlet holes 3 correspond to the static pressure holes 2-1 one by one, and the hole centers of the air inlet holes 3 are collinear with the hole centers of the corresponding static pressure holes 2-1 and the sphere center of the spherical outer cover, so that more air flows can conveniently flow into the static pressure holes 2-1, and even if the air flow in the mine is in a complete turbulent flow state, the air inflow of the outer cover 6 can be ensured.

As shown in FIG. 2, the four static pressure holes 2-1, the four air inlet holes 3 and the center of the sphere are positioned on the same cross section.

Further, filter and drying particles 7 for filtering and drying dust are filled between the outer cover 6 and the body 2, and the diameter of the filter and drying particles 7 is larger than that of the static pressure hole 2-1. The filter drying particles 7 can remove moisture and dust in the air flow, so that the air flow entering the static pressure holes 2-1 is dry and clean, and the static pressure holes 2-1 are prevented from being blocked.

The utility model discloses in, filter drying granule 7 can be silica gel filter drying granule also can be molecular sieve filter drying granule. The air inlet device can effectively remove moisture in the air flow entering the air inlet 3 and can also filter some dust particles in the air flow, so that the air flow entering the static pressure hole 2-1 becomes dry and clean stable air flow.

Further, the connection between the cover 6 and the body 2 is rounded. The resistance of the outer cover 6 to the flow direction of the air flow entering the full pressure hole 1-1 is reduced, and the influence of the outer cover 6 on the measurement of the full pressure value is reduced.

In this embodiment, the connection between the outer cover 6 and the body 2 is made into a streamline shape, so that the resistance of the outer cover 6 to the flow direction of the air flow is reduced, the outer cover 6 is prevented from blocking the flow direction of the air flow, the movement form of the air flow around the full pressure hole 1-1 is changed, the speed of the air flow entering the full pressure hole 1-1 is influenced, and the measurement of the full pressure value is influenced.

In the embodiment of fig. 2, the cross section of the outer side wall of the body 2 perpendicular to the length direction is circular, so that the consistency of the connection between the outer side wall of the body 2 and the outer cover 6 can be ensured, and the sealing performance between the outer cover 6 and the body 2 can be improved.

In this embodiment, as shown in fig. 1, the body 2 is substantially L-shaped and comprises a horizontal part and a vertical part which are vertically connected, the static pressure pipe 5 is located on the vertical part, and the cover 6 is sleeved on the horizontal part.

The distance between the two ends of the spherical ring cover connected with the body 2 is 1/3 of the length of the horizontal part of the body 2, so that the installation is more convenient.

The inner layer pipe 4 is also an L type pipe, and the inner layer pipe 4 penetrates through the hollow structure of the body 2 and is communicated with the full pressure hole 1-1.

Furthermore, a groove is formed in the inner wall of the body 2, the inner-layer pipe 4 is inserted into the groove and is in sealing connection with the full-pressure hole 1-1, the sealing performance of the full-pressure hole 1-1 and the inner-layer pipe 4 can be guaranteed, and the assembly is convenient.

The embodiment of the utility model provides an in, the internal diameter of recess is the same with inner tube 4's external diameter, with inner tube 4 disect insertion can, convenient assembling can not see when preventing to install, the installation is unsealed, the air current flows in the well kenozooecium of body 2 from total head hole 1-1, influences the measurement of static pressure value and total head value.

As shown in figure 2, the spherical outer cover is sleeved on the body 2, the body 2 is sleeved on the inner layer pipe 4, the air inlet holes 3 and the static pressure holes 2-1 are distributed at different angles, the device is suitable for air flows with different wind directions to enter the pitot tube, and the static pressure value is measured more accurately.

Further, the distance from the static pressure hole 2-1 to the full pressure hole 1-1 is more than or equal to 7 times of the diameter of the full pressure hole 1-1.

The inventor finds that the outer cover 6 influences the flow speed of the airflow in the process of implementing the invention, and the farther the outer cover 6 is away from the full pressure hole 1-1, the smaller the influence on the flow speed of the airflow around the full pressure hole 1-1 is, and the smaller the influence on the measurement of the full pressure value is. Only when the distance from the static pressure hole 2-1 to the full pressure hole 1-1 is more than or equal to 7 times of the diameter of the full pressure hole 1-1, the distance from the center of the outer cover 6 to the full pressure hole is the same as the distance from the static pressure hole 2-1 to the full pressure hole, the influence of the outer cover 6 on the flow speed of gas around the full pressure hole 1-1 can be ignored, and the measured full pressure value is more accurate.

Further, the end of the body 2 at the end where the full pressure hole 1-1 is located is hemispherical, so as to reduce the influence of the first side wall 1 of the body 2 on the flow rate of the air flow.

Preferably, the side wall of the body 2 is also provided with a suspension part 8 for suspending the pitot tube, and the side wall where the suspension part is arranged is opposite to the side wall where the static pressure tube 5 is arranged

As shown in fig. 1, the hanging portion 8 is disposed against the second side wall 9.

The utility model discloses in, the portion of hanging 8 can hang the pitot tube in the pit, need not place the support, and the object influences the velocity of flow of air current on every side as far as possible reduction to influence the measurement of total pressure value and static pressure value, improve measuring accuracy.

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 it; 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 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 pitot tube, comprising: the device comprises a body, an inner layer pipe, an outer cover and a static pressure pipe;

2. The pitot tube of claim 1, wherein filter and drying particles for filtering and drying dust are filled between the outer cover and the body, and the particle size of the filter and drying particles is larger than the diameter of the static pressure hole.

3. The pitot tube of claim 2, wherein the body is provided with a groove on an inner wall, and the inner tube is inserted into the groove to be connected with the full-pressure hole in a sealing manner.

4. The pitot tube of claim 3, wherein the housing is a spherical housing that is nested over the body.

5. The pitot tube of claim 4, wherein the static vents are at least four and at least four of the static vents are evenly distributed along a circumference of the body.

6. The pitot tube of claim 5, wherein the air inlet holes correspond to the static vents one to one, and the hole centers of the air inlet holes are collinear with the hole centers of the corresponding static vents and the spherical center of the spherical outer cover.

7. The pitot tube of claim 6, wherein a junction of the housing and the body is rounded.

8. The pitot tube of claim 7, wherein a cross-section of the outer sidewall of the body perpendicular to the length direction is circular.

9. The pitot tube of claim 8, wherein the distance from the static pressure port to the full pressure port is equal to or greater than 7 times the diameter of the full pressure port.

10. The pitot tube of any one of claims 1 to 9, wherein the sidewall of the body is provided with a hanging part for hanging the pitot tube, and the sidewall of the hanging part is opposite to the sidewall of the static pressure tube.