An averaging pitot tube flow meter

Abstract

This utility model provides an averaging pitot tube flow meter, comprising: a connecting seat, a pressure tapping valve assembly, a detection rod, and a sealing sleeve. The connecting seat has a first pressure tapping channel and a second pressure tapping channel. The pressure tapping valve assembly is connected to the first pressure tapping channel and the second pressure tapping channel respectively. The detection rod has a first detection channel and a second detection channel arranged in parallel. The sealing sleeve is sleeved on the detection rod and is fixedly connected to the bottom of the connecting seat. The first detection channel protrudes from the second detection channel at one end along the length of the detection rod near the connecting seat. The advantages of this utility model are: By protruding the first detection channel from the second detection channel, the first detection channel is directly connected to the connecting seat, and the first and second detection channels are directly connected to the first and second pressure tapping channels, eliminating the need for capillary tube connection and avoiding blockage.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to an averaging pitot tube flow meter. Background Technology

[0002] The averaging pitot tube (APT) probe, the measuring element of an averaging pitot tube flowmeter, is a new type of differential pressure flow measurement element developed based on the early Pitot tube velocity measurement principle. When combined with a differential pressure transmitter, the APT flow sensor can measure the flow rate of gas, liquid, and steam in circular and rectangular pipes. Compared with other flow meters, it has a series of outstanding advantages, including long-term stability, good repeatability, simple installation and maintenance, low permanent pressure loss, low operating cost, significant energy saving, and simple and reliable structure. It has been widely used, especially in energy and environmental measurement and testing. Therefore, APT flowmeters are widely used in industries such as power, metallurgy, petroleum, chemical, light industry, coal, and urban public utilities.

[0003] When an averaging pitot tube flowmeter is inserted into the pipe, according to the fluid continuity equation and Bernoulli's principle, a high-pressure distribution zone is generated in front of the probe as the fluid flows through it. The pressure in this high-pressure distribution zone is slightly higher than the static pressure of the pipe. As the fluid flows past the probe, it is forced to split into two streams, increasing its velocity and creating a low-pressure distribution zone behind the probe. The pressure in this low-pressure distribution zone is slightly lower than the static pressure of the pipe. The flow rate is accurately measured by measuring the pressure difference ΔP between the average positive pressure PH in the high-pressure zone and the average negative pressure PL in the low-pressure zone.

[0004] Existing averaging pitot tube flow meters typically design the detection probe as an open structure, with the detection probe connected to the pressure tapping circuit via a capillary structure. After the dirty medium enters the detection rod, most of the particles will fall back into the pipe due to gravity. Due to its inherent size, the capillary inevitably has narrow areas, which can easily cause blockages in the capillary during the pressure tapping process, making it impossible to perform measurements. Utility Model Content

[0005] This invention provides an averaging pitot tube flow meter to solve the technical problem that capillary tubes are prone to blockage during pressure tapping due to their size, thus making measurement impossible.

[0006] This utility model provides an averaging pitot tube flow meter, comprising:

[0007] The connector has a first pressure-tapping channel and a second pressure-tapping channel;

[0008] A pressure tapping valve assembly, wherein the pressure tapping valve assembly is respectively connected to the first pressure tapping channel and the second pressure tapping channel;

[0009] A detection rod, which is fixedly connected to the connecting seat, has a first detection channel and a second detection channel arranged in parallel.

[0010] A sealing sleeve is fitted onto the detection rod and is fixedly connected to the bottom of the connecting seat.

[0011] The first detection channel protrudes from the second detection channel at one end near the connecting seat along the length of the detection rod. The first detection channel is fixedly connected to the connecting seat and communicates with the first pressure tapping channel. The sealing sleeve is sealed and communicates with the second detection channel. The second detection channel communicates with the second detection channel through the sealing sleeve.

[0012] In one embodiment of the present invention, the diameter of the first detection channel is larger than the diameter of the first pressure tapping channel, and the diameter of the second pressure tapping channel is larger than the diameter of the second pressure tapping channel.

[0013] In one embodiment of the present invention, a flange assembly and an installation sleeve are further sleeved on the detection rod. The sealing sleeve, the flange assembly, and the installation sleeve are arranged sequentially along the direction away from the connecting seat. The sealing sleeve and the installation sleeve are respectively fixedly connected to both ends of the flange assembly.

[0014] In one embodiment of the present invention, the flange assembly includes a first flange and a second flange. Both the first flange and the second flange are sleeved on the detection rod. The first flange is located at one end near the connecting seat. The first flange is fixedly connected to the end of the sealing sleeve away from the connecting seat. The surface of the second flange away from the first flange is provided with an installation groove. The end of the installation sleeve near the second flange is fixedly disposed in the installation groove.

[0015] In one embodiment of the present invention, the end of the mounting sleeve away from the second flange is provided with a concave arc-shaped surface for mounting in conjunction with the tested component.

[0016] In one embodiment of the present invention, the bottom of the detection rod is provided with two first flow-dividing surfaces, which are respectively located on two opposite sides of the bottom of the detection rod, and the distance between the two first flow-dividing surfaces gradually increases along the fluid flow direction in the tested component;

[0017] The bottom of the detection rod is provided with two second flow-dividing surfaces, which are located on two opposite sides of the bottom of the detection rod. The distance between the two second flow-dividing surfaces gradually decreases along the fluid flow direction in the tested component.

[0018] The two first flow-diverting surfaces and the two second flow-diverting surfaces are arranged opposite each other along the fluid flow direction within the tested component.

[0019] In one embodiment of the present invention, the connecting seat is further provided with a first cleaning channel and a second cleaning channel. One end of the first cleaning channel is connected to the first pressure tapping channel, and the other end of the first cleaning channel penetrates the connecting seat and is connected to the first purging channel. One end of the second cleaning channel is connected to the second pressure tapping channel, and the other end of the second cleaning channel penetrates the connecting seat and is connected to the second purging channel.

[0020] Both the first purging channel and the second purging channel are equipped with shut-off valves.

[0021] In one embodiment of the present invention, the bottom of the detection rod is provided with two inclined guide surfaces, which are located on two opposite sides of the bottom of the detection rod, and the two guide surfaces are arranged to gradually approach each other along the direction away from the connecting seat.

[0022] In one embodiment of the present invention, a protruding sealing platform is provided at the bottom of the connecting seat, and an annular first sealing groove is provided inside the end of the sealing sleeve near the connecting seat. The first sealing groove is fitted onto the sealing platform, and the bottom of the first sealing groove is tightly connected to the sealing platform.

[0023] In one embodiment of the present invention, the bottom of the connecting seat is further provided with a second sealing groove, and the top of the connecting seat passes through the second sealing groove.

[0024] The beneficial effects of this utility model are as follows: The averaging pitot tube flow meter proposed in this utility model, by setting the first detection channel to protrude from the second detection channel, allows the first detection channel to be directly connected to the connecting seat without being affected by the second detection channel. The sealing sleeve is fitted on the detection rod, and the second detection channel is sealed to the second pressure tapping channel through the sealing sleeve. This allows the first and second detection channels to be directly connected to the first and second pressure tapping channels without the need for connection through a capillary tube, thus avoiding blockage. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0026] In the attached diagram:

[0027] Figure 1 This is an overall sectional view provided in one embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional view of the detection rod provided in one embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of the connector provided in one embodiment of the present utility model;

[0030] Figure 4 This is a bottom view of the detection rod provided in one embodiment of the present invention.

[0031] The attached figures are labeled as follows:

[0032] 1. Connecting seat; 101. First pressure tapping channel; 102. Second pressure tapping channel; 103. First cleaning channel; 104. Second cleaning channel; 105. Shut-off valve; 106. Sealing platform; 107. First sealing groove; 108. Second sealing groove; 2. Detection rod; 201. First detection channel; 202. Second detection channel; 3. High-pressure tapping valve; 4. Low-pressure tapping valve; 5. Sealing sleeve; 6. Flange assembly; 601. First flange; 602. Second flange; 603. Mounting groove; 604. Gasket; 7. Mounting sleeve. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0036] Please see Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention provides an averaging pitot tube flowmeter, comprising a connecting seat 1, a pressure tapping valve assembly, a detection rod 2, and a sealing sleeve 5. The connecting seat 1 has a first pressure tapping channel 101 and a second pressure tapping channel 102. The first pressure tapping channel 101 and the second pressure tapping channel 102 are both gradually inclined towards each other from top to bottom (the distance between the first pressure tapping channel 101 and the second pressure tapping channel 102 gradually decreases). The pressure tapping valve assembly is connected to the first pressure tapping channel 101 and the second pressure tapping channel 102 respectively. The pressure tapping valve assembly includes a high-pressure pressure tapping valve 3 and a low-pressure pressure tapping valve 4. The high-pressure pressure tapping valve 3 is connected to the first pressure tapping channel 101, and the low-pressure pressure tapping valve 4 is connected to the second pressure tapping channel 102, or the high-pressure pressure tapping valve 3 is connected to the second pressure tapping channel 102, and the low-pressure pressure tapping valve 4 is connected to the first pressure tapping channel 101. It should be noted that the high-pressure tapping valve 3 is located in the upstream section of the fluid flow direction. The detection rod 2 is fixedly connected to the connecting seat 1. The detection rod 2 has a first detection channel 201 and a second detection channel 202 arranged in parallel. Both the first detection channel 201 and the second detection channel 202 are vertically arranged and penetrate the upper and lower ends of the detection rod 2. The lower section of the detection rod 2 extends into the interior of the tested object to obtain fluid. The sealing sleeve 5 is sleeved on the detection rod 2 and is fixedly connected to the bottom of the connecting seat 1. The first detection channel 201 protrudes from the second detection channel 202 at one end near the connecting seat 1 along the length of the detection rod 2. The first detection channel 201 is fixedly connected to the connecting seat 1 and communicates with the first pressure tapping channel 101. The sealing sleeve 5 is sealed and communicates with the second detection channel 202. The second detection channel 202 is connected to the first detection channel 202 through the sealing sleeve 5. It should be noted that the first detection channel 201 is connected to the high-pressure tapping valve 3 through the first pressure tapping channel 101, and the second detection channel 202 is connected to the low-pressure tapping valve 4 through the second pressure tapping channel 102. Alternatively, the first detection channel 201 is connected to the high-pressure tapping valve 3 through the first pressure tapping channel 101. The first pressure tapping channel 101 is connected to the low-pressure tapping valve 4, and the second detection channel 202 is connected to the high-pressure tapping valve 3 through the second pressure tapping channel 102. The arrangement of the first detection channel 201 protruding from the second detection channel 202 ensures that when the first detection channel 201 is installed with the connecting seat 1, the second detection channel 202 will not obstruct the installation of the first detection channel 202. The second detection channel 202 is connected through the sealing sleeve 5, which also ensures the seal between the second detection channel 202 and the second pressure tapping channel 102. Furthermore, the staggered installation of the first detection channel 201 and the second detection channel 202 increases the diameter of the pipes of the first detection channel 201 and the second detection channel 202, thereby increasing the pressure tapping circuit and preventing blockage.

[0037] Specifically, in an optional embodiment of this application, the diameter of the first detection channel 201 is larger than the diameter of the first pressure tapping channel 101, and the diameter of the second pressure tapping channel 102 is larger than the diameter of the second pressure tapping channel 102, thereby increasing the pressure tapping circuit and avoiding blockage.

[0038] Specifically, in an optional embodiment of this application, the detection rod 2 is further fitted with a flange assembly 6 and an installation sleeve 7. The sealing sleeve 5, the flange assembly 6, and the installation sleeve 7 are arranged sequentially in a direction away from the connecting seat 1. The sealing sleeve 5 and the installation sleeve 7 are respectively fixedly connected to both ends of the flange assembly 6 to seal the bottom of the sealing sleeve 5, so that the sealing cavity formed between the second detection channel 202 and the sealing sleeve 5 is sealed. The installation sleeve 7 is located below the flange assembly 6. When the detection rod 2 is inserted into the tested part, the installation sleeve 7 abuts against the outer wall of the tested part, which can prevent leakage of the tested part.

[0039] Specifically, in an optional embodiment of this application, the flange assembly 6 includes a first flange 601 and a second flange 602. Both the first flange 601 and the second flange 602 are sleeved on the detection rod 2. The first flange 601 is located at the end near the connecting seat 1 and is fixedly connected to the end of the sealing sleeve 5 away from the connecting seat 1. The surface of the second flange 602 away from the first flange 601 is provided with a mounting groove 603. The end of the mounting sleeve 7 near the second flange 602 is fixedly disposed in the mounting groove 603, thereby improving the sealing effect and preventing fluid in the tested component from flowing out between the mounting sleeve 7 and the detection rod 2. The sealing sleeve 5 is welded to the upper surface of the first flange 601 for even better sealing.

[0040] Specifically, in one optional embodiment of this application, the end of the mounting sleeve 7 furthest from the second flange 602 is provided with a concave arc-shaped surface for installation with the component under test. The concave arc-shaped surface is used to fit against the outer wall of the component under test. Two semi-circular notches are provided at the bottom of the mounting sleeve 7, forming a concave arc-shaped surface. The two semi-circular notches are arranged opposite each other and are used to mate with the outer wall of the component under test (circular pipe). The arc-shaped surface fits better against the outer wall of the component under test, thereby improving the sealing effect. It should be noted that if the component under test is not a circular pipe (the cross-section is rectangular, triangular, or other polygonal), the concave arc-shaped surface is also set to the corresponding shape for easy mating.

[0041] Please see Figure 3Specifically, in an optional embodiment of this application, the connecting seat 1 is further provided with a first cleaning channel 103 and a second cleaning channel 104. One end of the first cleaning channel 103 is connected to the first pressure tapping channel 101, and the other end of the first cleaning channel 103 penetrates the connecting seat 1 and is connected to the first purging channel. One end of the second cleaning channel 104 is connected to the second pressure tapping channel 102, and the other end of the second cleaning channel penetrates the connecting seat 1 and is connected to the second purging channel. The first purging channel and the second purging channel... Each channel is equipped with a shut-off valve 105. The first cleaning channel 103 and the second cleaning channel 104 are respectively connected to the middle of the first pressure tapping channel 101 and the middle of the second pressure tapping channel 102. The valves are blown into the first pressure tapping channel 101 and the second pressure tapping channel 102 to clean the blockages. When the detection rod 2 is used for normal testing, the shut-off valves 105 on the first cleaning channel 103 and the second cleaning channel 104 are closed. The shut-off valves 105 will open to blow when cleaning is required.

[0042] Specifically, in an optional embodiment of this application, the bottom of the detection rod 2 is provided with two inclined guide surfaces. The two guide surfaces are respectively located on two opposite sides of the bottom of the detection rod 2, and the two guide surfaces are gradually moved closer to each other along the direction away from the connecting seat 1. The inclined arrangement can increase the area of ​​fluid entering the first detection channel 201 and the second detection channel 202, making it easier for fluid to enter.

[0043] Specifically, in an optional embodiment of this application, the bottom of the connecting seat 1 is provided with a protruding sealing platform 106, and the inner end of the sealing sleeve 5 near the connecting seat 1 is provided with an annular first sealing groove 107. The first sealing groove 107 is sleeved on the sealing platform 106, and the bottom of the first sealing groove 107 is tightly connected to the sealing platform 106. More sealing surfaces are formed between the first sealing groove 107 and the sealing platform 106, and the sealing surface is formed between the bottom of the first sealing groove 107 and the sealing platform 106, so that the sealing effect is better.

[0044] Specifically, in an optional embodiment of this application, the bottom of the connecting seat 1 is further provided with a second sealing groove 108, the top of the connecting seat 1 passes through the second sealing groove 108, and the top of the first sealing groove 107 extends into the second sealing groove 108, further improving the sealing effect.

[0045] Specifically, in an optional embodiment of this application, a gasket 604 is provided between the first flange 601 and the second flange 602.

[0046] Please see Figure 4Specifically, in one optional embodiment of this application, the bottom of the detection rod is provided with two first flow-dividing surfaces 109, which are respectively located on two opposite sides of the bottom of the detection rod. The distance between the two first flow-dividing surfaces 109 gradually increases along the fluid flow direction within the tested component. The bottom of the detection rod is also provided with two second flow-dividing surfaces 110, which are respectively located on two opposite sides of the bottom of the detection rod. The distance between the two second flow-dividing surfaces 110 gradually decreases along the fluid flow direction within the tested component. The two first diversion surfaces 109 and the two second diversion surfaces 110 are arranged opposite each other along the fluid flow direction in the tested component. In this embodiment, the two first diversion surfaces 109 are located in front of the bottom of the detection rod (the surface of the detection rod facing the fluid flow direction), and the two second diversion surfaces 110 are located behind the bottom of the detection rod. The two first diversion surfaces 109 and the two second diversion surfaces 110 form a quadrilateral structure, such as a rhombus or a square, which plays a role in diverting and guiding the fluid, reducing the impact force generated by the fluid during the measurement process, and improving the measurement stability.

[0047] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An averaging pitot tube flow meter, characterized in that, include: The connector has a first pressure-tapping channel and a second pressure-tapping channel; A pressure tapping valve assembly, wherein the pressure tapping valve assembly is respectively connected to the first pressure tapping channel and the second pressure tapping channel; A detection rod, which is fixedly connected to the connecting seat, has a first detection channel and a second detection channel arranged in parallel. A sealing sleeve is fitted onto the detection rod and is fixedly connected to the bottom of the connecting seat. The first detection channel protrudes from the second detection channel at one end of the detection rod near the connecting seat along the length direction. The first detection channel is fixedly connected to the connecting seat and communicates with the first pressure tapping channel. The sealing sleeve is sealed and communicates with the second detection channel. The second detection channel communicates with the second detection channel through the sealing sleeve.

2. The averaging pitot tube flowmeter according to claim 1, characterized in that: The diameter of the first detection channel is larger than the diameter of the first pressure tapping channel, and the diameter of the second pressure tapping channel is larger than the diameter of the second pressure tapping channel.

3. The averaging pitot tube flowmeter according to claim 1, characterized in that: The detection rod is also fitted with a flange assembly and an installation sleeve. The sealing sleeve, flange assembly, and installation sleeve are arranged sequentially in a direction away from the connecting seat. The sealing sleeve and the installation sleeve are respectively fixedly connected to both ends of the flange assembly.

4. The averaging pitot tube flowmeter according to claim 3, characterized in that: The flange assembly includes a first flange and a second flange, both of which are fitted onto the detection rod. The first flange is located at one end near the connecting seat and is fixedly connected to the end of the sealing sleeve away from the connecting seat. The surface of the second flange away from the first flange is provided with a mounting groove, and the end of the mounting sleeve near the second flange is fixedly disposed in the mounting groove.

5. The averaging pitot tube flowmeter according to claim 4, characterized in that: The end of the mounting sleeve away from the second flange is provided with a concave arc-shaped surface for installation in conjunction with the part being tested.

6. The averaging pitot tube flowmeter according to claim 1, characterized in that: The bottom of the detection rod is provided with two first flow-dividing surfaces, which are located on two opposite sides of the bottom of the detection rod. The distance between the two first flow-dividing surfaces gradually increases along the fluid flow direction in the tested component. The bottom of the detection rod is provided with two second flow-dividing surfaces, which are located on two opposite sides of the bottom of the detection rod. The distance between the two second flow-dividing surfaces gradually decreases along the fluid flow direction in the tested component. The two first flow-diverting surfaces and the two second flow-diverting surfaces are arranged opposite each other along the fluid flow direction within the tested component.

7. An averaging pitot tube flowmeter according to any one of claims 1-5, characterized in that: The connecting seat is also provided with a first cleaning channel and a second cleaning channel. One end of the first cleaning channel is connected to the first pressure tapping channel, and the other end of the first cleaning channel penetrates the connecting seat and is connected to the first purging channel. One end of the second cleaning channel is connected to the second pressure tapping channel, and the other end of the second cleaning pipe penetrates the connecting seat and is connected to the second purging channel. Both the first purging channel and the second purging channel are equipped with shut-off valves.

8. An averaging pitot tube flowmeter according to any one of claims 1-5, characterized in that: The bottom of the detection rod is provided with two inclined guide surfaces, which are located on two opposite sides of the bottom of the detection rod, and the two guide surfaces are gradually moved closer to each other along the direction away from the connecting seat.

9. An averaging pitot tube flowmeter according to any one of claims 1-5, characterized in that: The bottom of the connector is provided with a protruding sealing platform, and the inside of the sealing sleeve near the connector is provided with an annular first sealing groove. The first sealing groove is fitted onto the sealing platform, and the bottom of the first sealing groove is tightly connected to the sealing platform.

10. The averaging pitot tube flowmeter according to claim 9, characterized in that: The bottom of the connector is also provided with a second sealing groove, and the top of the connector passes through the second sealing groove.

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