CN110686736A - Pressure taking head of Pitotbar flow sensor - Google Patents

Abstract

The invention discloses a pressure-taking head of a Pitoba flow sensor, which has a cylindrical pressure-taking head body, a cylindrical joint with a reduced diameter is formed on the upper part of the pressure-taking head body, and a pressure-taking head body is provided in the pressure-taking head body. A plurality of full pressure channels and static pressure channels on opposite sides of the axis, the axis of each full pressure channel and static pressure channel is parallel to the axis of the pressure-taking head body, and each full pressure channel and static pressure channel has a column located in the column. The full pressure channel port and the static pressure channel port on the upper end of the joint, and the bottom of each full pressure channel and static pressure channel has a full pressure hole and a static pressure hole. When using the pressure-taking head of the present invention to measure the total pressure and static pressure of the fluid in the pipeline, and then measure the flow of the fluid in the pipeline, it is equivalent to using multiple Pitoba flowmeters to measure the flow of the fluid in the pipeline at the same time, and the flow measurement results can be selected The average value of all measurement results, the measurement results are relatively accurate, and the measurement accuracy is high.

Description

Pitoba flow sensor pressure tap

technical field

The invention relates to a pressure-taking head of a Pitoba flow sensor.

Background technique

In the prior art, the Bitopa flow sensor includes a pressure guiding tube and a pressure-taking head, the pressure-taking head has a cylindrical pressure-taking head body, and a cylindrical joint with a reduced diameter is formed on the upper part of the pressure-taking head body. There are full pressure channels and static pressure channels located on opposite sides of the axis of the pressure-taking head body. The axes of the full-pressure channel and the static pressure channel are both parallel to the axis of the pressure-taking head body. The full pressure channel port and the static pressure channel port at the upper end of the joint, and the lower part of the pressure taking head body has a full pressure hole and a static pressure hole which are communicated with the full pressure channel and the static pressure channel. The pressure guiding tube has an outer tube and an inner tube in the outer tube. The upper ends of the outer tube and the inner tube of the pressure guiding tube are respectively a full pressure interface and a static pressure interface, and the pressure taking head is welded with its cylindrical joint. It is connected to the lower end of the pressure guiding tube. After the pressure-taking head is connected to the pressure guiding tube, the full pressure channel port is connected to the outer tube of the pressure guiding tube, and the static pressure channel port is connected to the inner tube of the pressure guiding tube to form a Pitoba flow sensor. .

When in use, the Pitoba flow sensor is inserted vertically into the pipeline from the side wall of the pipeline, the full pressure hole is facing the inflow direction of the fluid, and the static pressure hole is facing the outflow direction of the fluid. The total pressure interface and static pressure interface at the upper end of the pressure pipe output the total pressure and static pressure of the fluid flowing in the pipeline, respectively. Using the total pressure and static pressure of the fluid flowing in the pipeline, the fluid in the pipeline can be calculated according to the principle of fluid mechanics. flow.

During the long-term use of the pressure-taking head of the Bitopa flow sensor in the above-mentioned prior art, when the pressure-taking head is inserted into the pipeline to be measured, the full-pressure or static-pressure holes sometimes may cause scaling on the inner wall of the hole, excessive dust accumulation and crystallization, which will lead to The output full pressure or static signal is not accurate enough, resulting in a large error in the measurement result of the fluid flow in the pipeline.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a Pitoba flow sensor pressure-taking head that can output multiple groups of full pressure and static pressure signals of the fluid medium in the pipeline to be measured, so that relatively accurate measurement results can be obtained for the fluid flow in the pipeline. .

In order to solve the above-mentioned technical problems, the pressure-taking head of the Bitopa flow sensor of the present invention has a cylindrical pressure-taking head body, the upper part of the pressure-taking head body is formed with a cylindrical joint with a reduced diameter, and a pressure-taking head body is provided with a position located in the pressure-taking head body. The full pressure channel and the static pressure channel on the opposite sides of the axis of the indenter body, the axes of the full pressure channel and the static pressure channel are both parallel to the axis of the indenter body, and the full pressure channel and the static pressure channel have the upper end of the cylindrical joint. There are multiple full-pressure channels and static-pressure channels. These full-pressure channels and static-pressure channels are spaced on opposite sides of the body axis of the pressure-taking head. There is a channel wall between adjacent full pressure channels and static pressure channels, a full pressure channel wall between adjacent full pressure channels, and a static pressure channel wall between adjacent static pressure channels; the axis of the pressure-taking head body There are multiple parallel full-pressure inclined planes on one side from top to bottom. These full-pressure inclined planes intersect with the full-pressure channel to form a plurality of full-pressure holes. The walls of the full-pressure passage between adjacent full-pressure holes There is a full pressure channel wall plane perpendicular to the plane defined by the axis of the full pressure channel, and the other side opposite to the axis of the pressure head body has a plurality of mutually parallel static pressure slopes from top to bottom. These static pressure slopes A plurality of static pressure holes are formed to intersect with the static pressure channel respectively, and a static pressure channel wall plane perpendicular to the plane determined by the axis of the static pressure channel is formed on the wall of the static pressure channel between the adjacent static pressure holes. .

When using the pressure-taking head of the Bitopa flow sensor with the above structure, the multiple full-pressure channel ports and the static pressure channel ports should be connected to a plurality of full-pressure guide pipes and static pressure guide pipes respectively. When using a Toba flowmeter, the full pressure interface and the static pressure interface of the corresponding total pressure guide pipe and static pressure guide pipe are respectively connected with the corresponding differential pressure transmitter, and the pressure taking head of the present invention is used to measure the fluid in the pipeline. When measuring the total pressure and static pressure of the pipeline, and then measuring the flow of the fluid in the pipeline, it is equivalent to using multiple Pitoba flowmeters to measure the flow of the fluid in the pipeline at the same time. , the measurement accuracy is high; when a set of differential pressure signals output by a full pressure pressure pipe and the corresponding static pressure pressure pipe are transmitted to the flow value calculated by the flow totalizer through the corresponding differential pressure transmitter When the difference from the average value of all measurement results exceeds a certain range, the integrator can output the average value of other measurement results, and still obtain relatively accurate measurement results.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic view of the main cross-sectional structure of the pressure-taking head of the Pitoba flow sensor of the present invention.

FIG. 2 is a schematic left side view of FIG. 1 .

FIG. 3 is a schematic right side view of FIG. 1 .

FIG. 4 is a schematic bottom view of FIG. 1 .

Detailed ways

Referring to Figures 1 to 4, the pressure-taking head of the Pitoba flow sensor of the present invention has a cylindrical pressure-taking head body 1, the upper part of the pressure-taking head body 1 is formed with a cylindrical joint 2 with a reduced diameter, and the pressure-taking head body 1 There are full pressure channel 3 and static pressure channel 4 located on opposite sides of the axis 100 of the pressure-taking head body. The axes of the full-pressure channel 3 and the static pressure channel 4 are both parallel to the axis 100 of the pressure-taking head body. 3 and the static pressure channel 4 have a full pressure channel port 5 and a static pressure channel port 6 located at the upper end of the cylindrical joint 2, the full pressure channel 3 and the static pressure channel 4 are multiple, and these full pressure channels 3 and static pressure channels are multiple. The pressure channels 4 are opened on opposite sides of the axis 100 of the pressure-taking head body at intervals. The axes of these full pressure channels 3 and static pressure channels 4 are all parallel to the axis 100 of the pressure-taking head body and are located in the same plane, and each full pressure channel 3 and static pressure channel 4 has a full pressure at the upper end of the cylindrical joint 2 The channel port 5 and the static pressure channel port 6 have a channel wall 7 between the adjacent full pressure channel 3 and the static pressure channel 4, and there is a full pressure channel wall 31 between the adjacent full pressure channels 3, and the adjacent static pressure channels have a channel wall 7 between them. There are static pressure channel walls 41 between the channels 4 . One side of the axis 100 of the pressure-taking head body has a plurality of full-pressure inclined surfaces 8 parallel to each other from top to bottom. A full-pressure channel wall plane 33 perpendicular to the plane defined by the axis of the full-pressure channel 3 is formed on the full-pressure channel wall 31 between adjacent full-pressure holes 32 . The full-pressure channel wall intersection 34 on the full-pressure channel wall 31 between the inclined surfaces 8 are parallel to each other and parallel to the end face of the cylindrical pressure-taking head body 1, and the opposite side of the pressure-taking head body axis 100 is from top to bottom. There are a plurality of static pressure slopes 9 parallel to each other, and these static pressure slopes 9 respectively intersect with the static pressure channel 4 to form a plurality of static pressure holes 42. The static pressure channel wall 41 between adjacent static pressure holes 42 is formed. A static pressure channel wall plane 43 perpendicular to the plane defined by the axis of the static pressure channel 4 is formed, and a static pressure channel on the static pressure channel wall 41 between the static pressure channel wall plane 43 and the adjacent static pressure slope 9 is formed The wall intersection lines 44 are parallel to each other and to the end face of the cylindrical indenter body 1 . The channel wall intersection lines 71 and 72 formed by the intersection of the lowermost full pressure slope 8 and the static pressure slope 9 with the channel wall 7 are parallel to each other and are parallel to the plane determined by the axis of the full pressure channel 3 or the static pressure channel 4. vertical.

The differential pressure between the positive pressure passages and the negative pressure passages is due to the different proportions of the insertion depths in the pipes. When there is medium flowing, the flow velocity between the positive pressure passages and the negative pressure passages is different due to the difference in the flow velocity at the center of the pipe and the flow velocity at the edge of the pipe. There is a certain proportion of the differential pressure between the two. When the scale is formed in the pipeline, the inner diameter of the pipeline decreases. At this time, the proportion of the sensor inserted in the pipeline changes, and the differential pressure between each positive pressure channel and The calculator calculates the pipeline fouling by recording the relationship between the differential pressure proportional relationship and the pipeline fouling situation. Thereby, the flow area of the medium is calculated and corrected automatically.

Claims (1)

1. The utility model provides a pressure head is got to pitot bar flow sensor, the pressure head body (1) is got to the cylindricality has, the upper portion of getting the pressure head body is formed with the cylindricality that the diameter reduces and connects (2), get and set up in the pressure head body and be located full pressure passageway (3) and static pressure passageway (4) of getting pressure head body axis (100) relative both sides, the axis of full pressure passageway and static pressure passageway all parallels with the axis of getting the pressure head body, full pressure passageway and static pressure passageway have and are located full pressure passway (5) and static pressure passway (6) that the cylindricality connects the upper end, its characterized in that: the pressure tapping head comprises a pressure tapping head body, and is characterized in that a plurality of full-pressure channels (3) and static-pressure channels (4) are arranged on two opposite sides of the axis (100) of the pressure tapping head body at intervals, channel walls (7) are arranged between every two adjacent full-pressure channels and static-pressure channels, full-pressure channel walls (31) are arranged between every two adjacent full-pressure channels, and static-pressure channel walls (41) are arranged between every two adjacent static-pressure channels; one side of the pressure taking head body axis (100) is provided with a plurality of full-pressure inclined planes (8) which are parallel to each other from top to bottom, the full-pressure inclined planes are respectively intersected with the full-pressure channel (3) to form a plurality of full-pressure holes (32), a full-pressure channel wall plane (33) which is vertical to a plane determined by the axis of the full-pressure channel is formed on a full-pressure channel wall (31) between every two adjacent full-pressure holes (32), the other side, opposite to the pressure taking head body axis (100), is provided with a plurality of static pressure inclined planes (9) which are parallel to each other from top to bottom, the static pressure inclined planes are respectively intersected with the static pressure channel (4) to form a plurality of static pressure holes (42), and a static pressure channel wall plane (43) which is vertical to the plane determined by the axis of the static pressure channel is formed on a static pressure channel wall (41) between.

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