Flow measuring device

Abstract

The utility model provides a flow measuring device, which comprises a speed measuring tube, a flow measuring tube, a flow measuring tube, a flow measuring tube, a flow measuring tube, a flow measuring tube, a flow measuring tube and a flow measuring tube, and is characterized in that a base is arranged at one end of the speed measuring tube; one end of the extension rod is detachably connected with the base, the extension rod is provided with a plurality of pipe joints which are sequentially connected end to end, and the pipe joints are detachably connected so that the length of the flow measuring device can be adjusted according to actual needs. According to the utility model, the problems of inconvenience in carrying, transportation and use caused by overlong manufacturing length of the speed measuring tube at present can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid measurement, in particular to a flow measurement device. Background Art

[0002] Wind speed measurement is the most common task in boiler tests in thermal power plants, and using a velocity tube to test wind speed is one of the conventional methods. According to relevant regulations, the grid method is used for measurement, and multiple test points of the measured air duct need to be tested. The larger the size of the air duct, the longer the required velocity tube. In actual work, a velocity tube of more than 4 meters is often required to meet the test requirements. The velocity tube is too long and inconvenient to carry, and large vehicles are needed to carry the velocity tube, which increases transportation costs. The weight of the velocity tube itself, plus the weight of the soft rubber tube connecting the velocity tube and the micromanometer, will make the entire measuring device too heavy, causing inconvenience in use. Utility Model Content

[0003] The utility model aims to provide a flow measurement device to solve the problems of inconvenience in carrying and transporting, and inconvenience in using caused by the excessively long manufacturing length of the velocity measuring tube.

[0004] The above technical objectives of the utility model are mainly achieved by the following technical solutions:

[0005] The utility model provides a flow measurement device, which comprises:

[0006] A velocity measuring tube, one end of which is provided with a base, wherein a micromanometer connected to the velocity measuring tube is provided in the base;

[0007] An extension rod has one end detachably connected to the base, and the extension rod has a plurality of pipe sections connected end to end in sequence, and each of the pipe sections is detachably connected so that the length of the flow measuring device can be adjusted according to actual needs.

[0008] The flow measuring device described in the utility model has a wide range of applications. The velocity measuring tube is set on an extension rod with adjustable length, and different numbers of pipe sections are combined to form flow measuring devices of different lengths, thereby facilitating the testing of the air volume in a large-sized air duct. There is no need to separately design and manufacture a relatively long flow measuring device for the large-sized air duct.

[0009] The flow measuring device described in the utility model is easy to carry and transport. The velocity measuring tube and the extension rod, as well as the tube sections in the extension rod, are all connected in a detachable manner. When the flow measuring device is not in use, it can be disassembled to form a component with a relatively small length, which is convenient for carrying, transportation and storage.

[0010] In a preferred embodiment of the present invention, the micromanometer is provided with an electrically connected pressure sensing module and a wireless transmission module, the pressure sensing module can measure the gas pressure in the velocity measuring tube and transmit the pressure signal to the wireless transmission module, the flow measuring device also includes a hand operator wirelessly connected to the wireless transmission module, the hand operator can receive and display the pressure signal emitted by the wireless transmission module.

[0011] In this embodiment, wireless transmission is used between the micromanometer and the hand operator to realize real-time display of the measured pressure value, which is relatively convenient and fast. Since the micromanometer needs to be extended into different positions in the air duct along with the velocity measuring tube, the tester needs an external display device to display the measurement results of the micromanometer in real time. Using a wired connection will cause wiring troubles and the need to adjust the wires in real time.

[0012] In a preferred embodiment of the present invention, the micromanometer further comprises an antenna module capable of enhancing the wireless communication signal strength of the wireless transmission module, and the antenna module is connected to the wireless transmission module by a wire.

[0013] In this embodiment, a longer extension rod will lead to unstable signal transmission between the wireless transmission module and the hand operator, so an antenna module is provided on the micromanometer to enhance the signal strength of the wireless transmission module.

[0014] In a preferred embodiment of the utility model, a plug is provided at one end of the extension rod away from the base, the antenna in the antenna module is provided on the plug, and the antenna is connected to the antenna interface on the micromanometer through a wire.

[0015] In this embodiment, the plug at the end of the extension rod mainly serves to fix the antenna. The antenna is arranged on the outside of the end of the extension rod through a wire and a plug, and is relatively close to the hand operator in the hand of the tester, which is conducive to signal transmission between the wireless transmission module and the hand operator.

[0016] In a preferred embodiment of the present invention, each of the pipe sections in the extension rod is provided with a scale portion for displaying the depth of the flow measurement device inserted into the air duct.

[0017] In this embodiment, the scale portion facilitates the tester to determine the depth of the flow measurement device inserted into the air duct.

[0018] In a preferred embodiment of the present invention, both ends of each pipe segment are provided with an inner tapered thread and an outer tapered thread, and two adjacent pipe segments are meshedly connected with each other through the inner tapered thread and the outer tapered thread.

[0019] In this embodiment, the extension rod formed by the plurality of pipe sections connected by threads has good rigidity and can maintain a straight shape after entering the air duct, and can also protect the internal wires and micromanometer.

[0020] In a preferred embodiment of the present invention, each of the pipe sections is a thin-walled stainless steel pipe, and both ends of each of the thin-walled stainless steel pipes are formed with the inner tapered thread and the outer tapered thread by rolling.

[0021] In this embodiment, the threaded thin-walled stainless steel tube has good rigidity and can maintain a straight shape after entering the air duct; the thin-walled stainless steel tube can also protect the internal wires and micromanometer; the connection port of the tapered threaded thin-walled stainless steel tube is roll-formed, and the wall thickness of the bottom of the thread groove is uniform and the same as the thickness of the pipe, overcoming the problem of easy fatigue fracture of the interface and easy leakage due to temperature difference stress.

[0022] In a preferred embodiment of the present invention, the length of the pipe segment is less than 60 cm, and the length of the outer tapered thread and the length of the inner tapered thread are both 3 cm to 10 cm.

[0023] In this embodiment, the length of each pipe section in the extension rod is short, which is convenient for transportation and carrying; after assembling multiple pipe sections, an extension rod of ideal length can be obtained. The disassembled flow measurement device can be placed in a 60cm×20cm×20cm transportation box, which is convenient for transportation and carrying.

[0024] In a preferred embodiment of the utility model, the velocity measuring tube has a total pressure channel and a static pressure channel arranged in parallel, the total pressure channel forms a total pressure hole toward the direction of the base, and the static pressure channel forms a static pressure hole toward the direction of the base, and the micromanometer is provided with a total pressure interface and a static pressure interface respectively connected to the total pressure hole and the static pressure hole.

[0025] In this embodiment, the static pressure interface and the total pressure interface can realize the connection between the velocity measuring tube and the micromanometer, so that the micromanometer can accurately obtain the static pressure and the total pressure of the gas in the velocity measuring tube.

[0026] In a preferred embodiment of the present invention, the diameter of the base is the same as the diameter of each of the pipe sections in the extension rod.

[0027] In this embodiment, the connection between the pipe section and the base, and between the pipe sections, is smooth without obvious diameter changes and bosses, which facilitates the insertion and removal of the extension rod in the test hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0030] Figure 1 It is a structural schematic diagram of the flow measurement device of the utility model;

[0031] Figure 2 It is a partial structural schematic diagram of the flow measurement device of the utility model;

[0032] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0033] Figure 4 It is a schematic diagram of the connection structure of the micromanometer described in the utility model.

[0034] Description of reference numerals:

[0035] 10. Velocimeter tube; 11. Total pressure channel; 12. Total pressure hole; 13. Static pressure channel; 14. Static pressure hole;

[0036] 20. Extension rod; 21. Pipe joint;

[0037] 30. Base; 31. Fixing screws;

[0038] 40. Micromanometer; 41. Antenna interface; 42. Antenna; 43. Wire; 44. Total pressure interface; 45. Static pressure interface; 46. Fixing screw hole;

[0039] 50. Plug;

[0040] 60. Hand operator. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] like Figures 1 to 4 As shown, the utility model provides a flow measurement device, which includes: a velocity measuring tube 10, one end of which is provided with a base 30, and the base 30 is provided with a micromanometer 40 connected to the velocity measuring tube 10; an extension rod 20, one end of which is detachably connected to the base 30, and the extension rod 20 has a plurality of pipe sections 21 connected in sequence end to end, and each pipe section 21 is detachably connected so that the length of the flow measurement device can be adjusted according to actual needs.

[0045] The flow measurement device described in the utility model has a wide range of applications. The velocity measuring tube 10 is set on an extension rod 20 with adjustable length, and different numbers of pipe sections 21 are combined to form flow measurement devices of different lengths, thereby facilitating the testing of the air volume in a large-sized air duct, without the need to separately design and manufacture a relatively long flow measurement device for the large-sized air duct.

[0046] The flow measuring device of the utility model is easy to carry and transport. The velocity measuring tube 10 and the extension rod 20, as well as the tube sections 21 in the extension rod 20, are all connected in a detachable manner. When the flow measuring device is not in use, it can be disassembled to form a component with a relatively small length, which is convenient for carrying, transportation and storage.

[0047] The specific structure of each part of the flow measurement device of the present invention and the connection relationship between the parts will be described in detail below.

[0048] like Figure 1 and Figure 2 As shown, the velocity measuring tube 10 is a prior art, and a pitot tube, an elbow backrest tube or a BS-I type backrest tube can be selected. The above-mentioned types of velocity measuring tubes 10 are all measuring devices for determining the airflow velocity by measuring the total airflow pressure and static pressure, and then obtaining the gas flow in the air duct. The flow measurement principle will not be described in detail here.

[0049] In this embodiment, if Figure 1 and Figure 2 As shown, it shows the structure of the BS-I type backrest tube. This type of velocity measuring tube 10 has a total pressure channel 11 and a static pressure channel 13 arranged in parallel. When testing, the length direction of the velocity measuring tube 10 is set to be perpendicular to the flow direction of the airflow, the inlet of the total pressure channel 11 is facing away from the flow direction of the airflow, and the inlet of the static pressure channel 13 is facing the flow direction of the airflow, so as to obtain the total pressure (total pressure) and static pressure of the airflow in the air duct.

[0050] like Figure 2 As shown, a base 30 is welded at one end of the velocity measuring tube 10. The base 30 is a cylindrical structure with one end open. Two through holes corresponding to the total pressure channel 11 and the static pressure channel 13 are provided on the bottom surface of the base 30. The velocity measuring tube 10 is welded on the outside of the bottom surface; two short tapered tubes are welded on the inner side of the bottom surface at positions corresponding to the two through holes, and the end of the short tapered tube corresponding to the total pressure channel 11 forms a total pressure hole 12, and the end of the short tapered tube corresponding to the static pressure channel 13 forms a static pressure hole 14.

[0051] Further, such as Figure 3 and Figure 4 As shown, a micromanometer 40 for measuring the gas pressure in the total pressure channel 11 and the static pressure channel 13 is arranged in the base 30. The micromanometer 40 is cylindrical in shape, matching the inner diameter of the base 30, so as to facilitate the fixing and installation of the micromanometer 40. Two threaded holes are arranged on the bottom surface of the base 30, and fixing screws 31 are arranged in the threaded holes. Fixing screw holes 46 are opened at the positions of the micromanometer 40 corresponding to the threaded holes, and the fixing screws 31 fix the micromanometer 40 on the base 30 through the fixing screw holes 46. The micromanometer 40 is provided with a total pressure interface 44 and a static pressure interface 45 which are respectively connected to the total pressure hole 12 and the static pressure hole 14. After the micromanometer 40 is installed and fixed, the total pressure hole 12 is located in the total pressure interface 44, and the static pressure hole 14 is located in the static pressure interface 45. The static pressure interface 45 and the total pressure interface 44 can realize the connection between the velocity measuring tube 10 and the micromanometer 40, so that the micromanometer 40 can accurately obtain the static pressure and total pressure of the gas in the velocity measuring tube 10.

[0052] Preferably, there are silicone gaskets inside the full-pressure interface 44 and the static pressure interface 45 to ensure the tightness of the connection between the full-pressure hole 12 and the full-pressure interface 44 , and the static pressure hole 14 and the static pressure interface 45 .

[0053] The flow measurement device of the present invention further comprises an extension rod 20, which is connected to one end of the base 30 away from the velocity measuring tube 10, that is, one end of the extension rod 20 is connected to the open end of the base 30. In the embodiment, the extension rod 20 and the base 30 are detachably connected together by threaded connection.

[0054] Further, such as Figure 1 As shown, the extension rod 20 includes a plurality of pipe sections 21 connected end to end in sequence, and adjacent pipe sections 21 are detachably connected together; the tester can select a suitable number of pipe sections 21 according to actual measurement needs to form an extension rod 20 of a predetermined length. The length direction of the extension rod 20 is the same as the length direction of the velocity measuring tube 10. When in use, the tester holds one end of the extension rod 20, passes the velocity measuring tube 10 connected to the head end of the extension rod 20 (i.e., the end close to the velocity measuring tube 10) through the test hole on the side wall of the air duct to be tested, and uses the length of the extension rod 20 itself to move the velocity measuring tube 10 to the designated test position for pressure measurement.

[0055] The structure and technical effects of a preferred embodiment of the flow measurement device of the present invention will be further described below.

[0056] According to one embodiment of the present utility model, Figure 1 As shown, the micromanometer 40 is provided with an electrically connected pressure sensing module and a wireless transmission module. The pressure sensing module can measure the gas pressure in the velocity measuring tube 10 and transmit the pressure signal to the wireless transmission module. The flow measuring device also includes a hand operator 60 wirelessly connected to the wireless transmission module. The hand operator 60 can receive and display the pressure signal emitted by the wireless transmission module.

[0057] Wireless transmission is used between the micromanometer 40 and the hand operator 60 to realize real-time display of the measured pressure value, which is relatively convenient and fast. Since the micromanometer 40 needs to be extended into different positions in the air duct along with the velocity measuring tube 10, the tester needs an external display device to display the measurement results of the micromanometer 40 in real time. Using a wired connection will cause wiring troubles and the need to adjust the wire 43 in real time.

[0058] The pressure sensing module in the micromanometer 40 may be, but not limited to, a pressure sensor, and the wireless transmission module in the micromanometer 40 may be, but not limited to, a Bluetooth device. The hand operator 60 has a display screen and buttons, the screen is used to display parameters such as real-time differential pressure and average differential pressure, and the buttons are used to adjust the display content of the screen.

[0059] Furthermore, the micromanometer 40 has a battery inside, and the battery can supply power to the pressure sensing module and the wireless transmission module to ensure the normal use of the micromanometer 40 .

[0060] According to one embodiment of the present utility model, Figure 1 As shown, the micromanometer 40 also includes an antenna module capable of enhancing the wireless communication signal strength of the wireless transmission module, and the antenna module is connected to the wireless transmission module by a wire.

[0061] The longer length of the extension rod 20 will lead to unstable signal transmission between the wireless transmission module and the hand operator 60 , so an antenna module is provided on the micromanometer 40 to enhance the signal strength of the wireless transmission module.

[0062] Specifically, Figure 1 and Figure 4 As shown, a plug 50 is provided at one end of the extension rod 20 away from the base 30. The plug 50 is a round cover with the same diameter as the extension rod 20, which is connected to the tail end of the extension rod 20 (i.e., the end away from the base 30) by threaded connection. A small hole is provided on the plug 50 for the wire 43 to pass through. The antenna 42 in the antenna module is fixed on the outer wall of the plug 50. The two ends of the wire 43 passing through the small hole are respectively connected to the antenna interface 41 and the antenna 42 on the micromanometer 40. The plug 50 at the tail mainly plays the role of fixing the antenna 42. The antenna 42 is arranged on the outside of the tail of the extension rod 20 through the wire 43 and the plug 50, and the distance to the hand operator 60 in the tester's hand is relatively close, so it is conducive to the signal transmission between the wireless transmission module and the hand operator 60.

[0063] According to one embodiment of the utility model, each pipe section 21 in the extension rod 20 is provided with a scale portion for displaying the depth of the flow measuring device inserted into the air duct; the scale portion facilitates the tester to determine the depth of the flow measuring device inserted into the air duct.

[0064] According to one embodiment of the utility model, both ends of each pipe segment 21 are provided with an inner tapered thread and an outer tapered thread, and two adjacent pipe segments 21 are connected by meshing the inner tapered thread and the outer tapered thread. The extension rod 20 formed by the plurality of pipe segments 21 connected by threads has good rigidity, can maintain a straight shape after entering the air duct, and can also protect the internal wire 43 and the micromanometer 40.

[0065] Specifically, each pipe section 21 is a thin-walled stainless steel pipe, and both ends of each thin-walled stainless steel pipe are formed with inner tapered threads and outer tapered threads by rolling. The threaded thin-walled stainless steel pipe has good rigidity and can maintain a straight shape after entering the air duct; the thin-walled stainless steel pipe can also protect the internal wire 43 and the micromanometer 40; the threaded connection of the tapered threaded thin-walled stainless steel pipe is formed by rolling, and the wall thickness of the thread groove bottom is uniform and the same as the thickness of the pipe, which overcomes the fatigue fracture and temperature difference stress leakage at the interface.

[0066] In this embodiment, the length of the pipe section is less than 60 cm, and the length of the outer tapered thread and the length of the inner tapered thread are both 3 cm to 10 cm; preferably, the length of the pipe section is 55 cm, and the length of the inner tapered thread and the outer tapered thread are both 5 cm. The length of each pipe section 21 in the extension rod 20 is short, which is convenient for transportation and carrying; after assembling multiple pipe sections 21, an extension rod 20 of an ideal length can be obtained. The tester can complete the connection and disassembly of the extension rod 20 by hand, and the disassembled flow measurement device can be placed in a 60cm×20cm×20cm transportation box, which is convenient for transportation and carrying.

[0067] According to one embodiment of the present invention, the diameter of the base 30 is the same as the diameter of each pipe section 21 in the extension rod 20. The connection between the pipe section 21 and the base 30 and between the pipe sections 21 is smooth, without obvious diameter change and boss, so that the extension rod 20 can be easily inserted and removed from the test hole on the side wall of the air duct.

[0068] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A flow measurement device, characterized in that: include: A velocity measuring tube, one end of which is provided with a base, wherein a micromanometer connected to the velocity measuring tube is provided in the base; An extension rod has one end detachably connected to the base, and the extension rod has a plurality of pipe sections connected end to end in sequence, and each of the pipe sections is detachably connected so that the length of the flow measuring device can be adjusted according to actual needs.

2. The flow measurement device according to claim 1, characterized in that: The micromanometer is provided with an electrically connected pressure sensing module and a wireless transmission module. The pressure sensing module can measure the gas pressure in the velocity measuring tube and transmit the pressure signal to the wireless transmission module. The flow measuring device also includes a hand operator wirelessly connected to the wireless transmission module. The hand operator can receive and display the pressure signal emitted by the wireless transmission module.

3. The flow measurement device according to claim 2, characterized in that: The micromanometer also includes an antenna module capable of enhancing the wireless communication signal strength of the wireless transmission module, and the antenna module is connected to the wireless transmission module by a wire.

4. The flow measurement device according to claim 3, characterized in that: A plug is provided at one end of the extension rod away from the base, the antenna in the antenna module is arranged on the plug, and the antenna is connected to the antenna interface on the micromanometer through a wire.

5. The flow measurement device according to claim 1, characterized in that: Each of the pipe sections in the extension rod is provided with a scale portion for displaying the depth of the flow measurement device inserted into the air duct.

6. The flow measurement device according to claim 1, characterized in that: Both ends of each pipe section are provided with an inner tapered thread and an outer tapered thread respectively, and two adjacent pipe sections are meshed and connected with each other through the inner tapered thread and the outer tapered thread.

7. The flow measurement device according to claim 6, characterized in that: Each of the pipe sections is a thin-walled stainless steel pipe, and both ends of each of the thin-walled stainless steel pipes are formed with the inner tapered thread and the outer tapered thread by rolling.

8. The flow measurement device according to claim 6 or 7, characterized in that: The length of the pipe section is less than 60 cm, and the length of the outer tapered thread and the length of the inner tapered thread are both 3 cm to 10 cm.

9. The flow measurement device according to claim 1, characterized in that: The velocity measuring tube has a total pressure channel and a static pressure channel arranged in parallel. The total pressure channel forms a total pressure hole toward the base, and the static pressure channel forms a static pressure hole toward the base. The micromanometer is provided with a total pressure interface and a static pressure interface respectively connected to the total pressure hole and the static pressure hole.

10. The flow measurement device according to claim 1, characterized in that: The diameter of the base is the same as the diameter of each pipe section in the extension rod.

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