A new type of flute air flow meter

Abstract

The utility model discloses a novel flute-type air flow meter, comprising a pitot tube body, an air inlet pipe is arranged at an internal position of the pitot tube body, the pitot tube body is connected with a multi-data probe junction box and a multi-data recorder, a square tube is arranged at an internal position of the node tube, an upper semicircular tube and a lower semicircular tube are arranged at the upper and lower sides of the square tube, square tube air inlet holes are arranged at the upper and lower sides of the square tube, the square tube air inlet holes correspond to the air inlet pipe, the upper semicircular tube and the lower semicircular tube are respectively provided with semicircular tube air inlet holes, the data of the multi-data probe junction box is connected to the multi-data recorder through an external module inside the multi-data probe junction box, so that wind pressure can be measured at multiple points at the same time, data is transmitted synchronously, and various information of the fan can be mastered at any time, and because the wind pressure at each point is measured at the same time without time difference, multiple time point data can be measured multiple times within the time required by the cooling tower test specification to obtain data, and the average value is finally calculated, so that the measured data is closer to the real wind pressure of the cooling tower.

Description

Technical Field

[0001] The utility model belongs to the technical field related to air volume testing of a circulating water cooling tower fan, and specifically relates to a novel flute-type air flow meter. Background Art

[0002] With the development of the cooling tower industry in China, the performance and cooling efficiency of cooling towers are important criteria for evaluating the quality of cooling towers. According to the cooling tower test specifications, air volume is an important criterion that affects the cooling efficiency of cooling towers. The air volume test method is to install a Pitot tube at the end of a pipe, make multiple marks on the pipe according to the equal area ring distribution method, and then use a hose to connect the Pitot tube and the micromanometer, and then insert the pipe into the wind duct, and gradually install the Pitot tube at the corresponding equal area ring measuring point position by pulling out the pipe, read the total pressure and static pressure at the corresponding position, and finally take the average of the total pressure and static pressure of multiple points. According to total pressure = dynamic pressure + static pressure, the average dynamic pressure inside the wind duct can be calculated, and then the air volume of the cooling tower fan under this working condition can be calculated based on the temperature and cross-sectional area inside the fan.

[0003] However, in the existing cooling tower test, although the wind pressure is measured at multiple points in the tower and the average value is taken, there is a time difference in the wind pressure taking points. The wind pressure at each point in the tower is not stable due to the influence of beams, columns and outlet height, and it changes at any time. Therefore, the data read from different points at different times are not stable. At the same time, only one data is read for each equal-area ring, and this data is relatively small. According to the principle of normal distribution, the error will be larger than the true value. Utility Model Content

[0004] The utility model aims to provide a novel flute-type air flow meter to solve the existing cooling tower test proposed in the above-mentioned background technology. Although the wind pressure is measured by taking the average value of the wind pressure at multiple points in the tower, there is a time difference in the wind pressure taking points. The wind pressure in the tower is affected by beams, columns and outlet heights, and the wind pressure at each point is not stable and changes at any time. Therefore, the data read from different points are not stable. At the same time, each equal-area ring only reads one data, which is relatively small. According to the principle of normal distribution, the error will be larger than the true value.

[0005] To achieve the above object, the utility model provides the following technical solution: an air intake pipe is arranged at an inner position of the Pitot tube body, the air intake pipe is fixedly connected to the Pitot tube body, and the Pitot tube body is connected to a multi-data probe junction box and a multi-data recorder;

[0006] The first section tube, the second section tube, the third section tube, the fourth section tube and the fifth section tube are sequentially arranged inside the Pitot tube body, the square tube is arranged at the internal position of the section tube, and the upper semicircular tube and the lower semicircular tube are respectively arranged on the upper and lower sides of the square tube.

[0007] Preferably, square tube air inlet holes are respectively provided on the upper and lower sides of the square tube, and the square tube air inlet holes correspond to the air inlet pipe.

[0008] Preferably, the upper semicircular tube and the lower semicircular tube are respectively provided with semicircular tube air inlet holes, and the semicircular tube air inlet holes correspond to the air inlet pipe.

[0009] Preferably, the Pitot tube body is a combined structure, and the Pitot tube body is made of stainless steel.

[0010] Preferably, the connecting flanges are respectively arranged at the left and right sides of the joint pipe, and bolt holes are arranged at the outer sides of the connecting flanges.

[0011] Preferably, the upper and lower sides of the connecting flange at the bottom of the joint pipe are respectively provided with air intake pipe limiting holes, and the joint pipes are bolted together through the bolt holes.

[0012] Preferably, equal-area circles are provided on both the upper and lower sides of the Pitot tube body, and the square tube and semicircular tube are made of stainless steel.

[0013] Compared with the prior art, the utility model provides a new flute-type air flow meter, which has the following beneficial effects:

[0014] 1. Through the arrangement of the first tube section, the second tube section, the third tube section, the fourth tube section, the fifth tube section, the square tube, the semicircular tube, the square tube air inlet, the air inlet pipe and the semicircular tube air inlet, the main body of the Pitot tube opens air inlets at the upper and lower sides of each combined part according to the measuring points of the equal-area circle, so as to ensure that the pressures at the same depth in all directions and at all parts in the closed container are equal, and after the pressure increase is generated by the force at any point, the pressure increase is instantly transmitted to each point of the static fluid, the square tube air inlet and the semicircular tube air inlet correspond to the air inlet pipe, and are used to introduce fluid samples, the upper semicircular tube and the lower semicircular tube are respectively provided with semicircular tube air inlets, and these air inlets also correspond to the air inlet pipe, so as to measure the dynamic pressure of the fluid, the main body of the Pitot tube adopts a combined structure, and is usually made of stainless steel, which is conducive to its good stability and durability in a variety of environments.

[0015] 2. Through the setting of connecting flanges, bolt holes and intake pipe limit holes, the section pipes are connected by bolts through bolt holes. This connection method may provide a more secure connection and ensure the stability of the system. At the same time, the setting between the connecting flanges ensures the sealing connection of the various components of the Pitot tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the air intake pipe in the utility model.

[0018] Figure 3 It is a structural schematic diagram of the cross section of the connecting flange in the utility model.

[0019] Figure 4 It is a structural schematic diagram of the rear side of the connecting flange in the utility model.

[0020] Figure 5 It is a structural schematic diagram of the semicircular tube section in the utility model.

[0021] Figure 6 It is a structural schematic diagram of the semicircular tube in the utility model.

[0022] Figure 7 It is a structural schematic diagram of the cross section of the middle tube of the utility model.

[0023] Figure 8 It is a structural schematic diagram of the middle tube of the utility model.

[0024] Fig. 9 It is a structural schematic diagram of the installation of the Pitot tube in the utility model.

[0025] Fig.10 This is a calculation table for the spacing between wind pressure collection holes in the utility model.

[0026] In the figure: 1. Pitot tube body; 2. First section of the tube; 3. Second section of the tube; 4. Third section of the tube; 5. Fourth section of the tube; 6. Fifth section of the tube; 7. Square tube; 8. Connecting flange; 9. Air inlet pipe; 10. Upper semicircular tube; 11. Lower semicircular tube; 12. Bolt hole; 13. Air inlet pipe limit hole; 14. Semicircular tube air inlet hole; 15. Square tube air inlet hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model provides Figure 1-10 A novel flute-type air flow meter shown includes a Pitot tube body 1;

[0029] An air inlet pipe 9 is arranged inside the Pitot tube body 1, and the air inlet pipe 9 is fixedly connected to the Pitot tube body 1, and the Pitot tube body 1 is connected to a multi-data probe junction box and a multi-data recorder;

[0030] The first section tube 2, the second section tube 3, the third section tube 4, the fourth section tube 5 and the fifth section tube 6 are arranged in sequence inside the Pitot tube body 1, a square tube 7 is arranged inside the section tube, and an upper semicircular tube 10 and a lower semicircular tube 11 are arranged on the upper and lower sides of the square tube 7 respectively.

[0031] Square tube air inlet holes 15 are respectively provided on the upper and lower sides of the square tube 7 , and the square tube air inlet holes 15 correspond to the air inlet pipe 9 .

[0032] The upper semicircular tube 10 and the lower semicircular tube 11 are respectively provided with semicircular tube air inlet holes 14 , and the semicircular tube air inlet holes 14 correspond to the air inlet pipe 9 .

[0033] The Pitot tube body 1 is a combined structure, and the Pitot tube body 1 is made of stainless steel.

[0034] Connecting flanges 8 are respectively arranged at the left and right sides of the joint pipe, and bolt holes 12 are arranged at the outer sides of the connecting flanges 8 .

[0035] The upper and lower sides of the connecting flange 8 at the bottom of the section pipe are respectively provided with intake pipe limiting holes 13 , and the section pipes are connected with bolts through bolt holes 12 .

[0036] The upper and lower sides of the Pitot tube body 1 are provided with equal-area circles, and the square tube and the semicircular tube are made of stainless steel.

[0037] In this embodiment, a novel flute-type air flow meter is implemented in the following specific steps. First, the position of each measuring point is determined according to the size of a conventional air duct and the size of an equal-area circle specified in a test specification, each measuring point is integrated into a pitot tube body 1, and the combined pitot tube is divided into five freely disassembled parts, which can be fastened together with bolts, and the number of sections of the combined pitot tube can be freely selected according to the size of the air duct, the hose is connected to a multi-data probe junction box, and then the data of the multi-data probe junction box is connected to a multi-data recorder through an external module inside the multi-data probe junction box to form a whole set.

[0038] like Figure 1-2 and Figure 5-10 As shown, the interior of the Pitot tube body 1 is sequentially provided with a first section tube 2, a second section tube 3, a third section tube 4, a fourth section tube 5 and a fifth section tube 6, a square tube 7 is provided at an internal position of the section tube, an upper semicircular tube 10 and a lower semicircular tube 11 are provided at the upper and lower sides of the square tube 7, square tube air inlet holes 15 are provided at the upper and lower sides of the square tube 7, the square tube air inlet holes 15 correspond to the air inlet pipe 9, the upper semicircular tube 10 and the lower semicircular tube 11 are provided with semicircular tube air inlet holes 14, the semicircular tube air inlet holes 14 correspond to the air inlet pipe 9, the Pitot tube body 1 is a combined structure, and the Pitot tube body 1 is made of stainless steel.

[0039] Preferably, the Pitot tube body 1 has air inlets on the upper and lower sides of each combined part according to the measuring points of the equal-area circle to ensure that the pressures in all directions and at the same depth in the closed container are equal, and when any point is subjected to force and produces a pressure increase, this pressure increase is instantly transmitted to each point of the static fluid. The square tube air inlet 15 and the semicircular tube air inlet 14 correspond to the air inlet pipe 9 and are used to introduce fluid samples. The upper semicircular tube 10 and the lower semicircular tube 11 are respectively provided with semicircular tube air inlet holes 14, which also correspond to the air inlet pipe 9 to facilitate the measurement of the dynamic pressure of the fluid. The Pitot tube body 1 adopts a combined structure and is usually made of stainless steel, which is conducive to maintaining good stability and durability in a variety of environments.

[0040] like Figure 3-4 As shown, connecting flanges 8 are respectively provided at the left and right sides of the joint pipe, bolt holes 12 are provided at the outer sides of the connecting flanges 8, and intake pipe limiting holes 13 are respectively provided at the upper and lower sides of the connecting flanges 8 at the bottom of the joint pipe. The joint pipes are bolted together through the bolt holes 12.

[0041] Preferably, the joint tubes are connected by bolts through the bolt holes 12 . This connection method may provide a more secure connection and ensure the stability of the system. At the same time, the arrangement between the connecting flanges 8 ensures that the various components of the Pitot tube body 1 are sealed and connected.

[0042] like Figure 1 and Figure 2 As shown, equal-area circles are provided on both the upper and lower sides of the Pitot tube body 1, and the square tube and the semicircular tube are made of stainless steel.

[0043] Optionally, the square tube 7 and the semicircular tube are made of stainless steel, which has the advantages of corrosion resistance and high strength, ensuring the accuracy and service life of the device. At the same time, the measuring points of the equal-area circle ensure that the pressure in all directions and at all parts of the closed container at the same depth is equal.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel flute-type air flow meter, comprising a Pitot tube body (1); An air inlet pipe (9) is arranged at an internal position of the Pitot tube body (1), the air inlet pipe (9) is fixedly connected to the Pitot tube body (1), and the Pitot tube body (1) is connected to a multi-data probe junction box and a multi-data recorder; Features: The Pitot tube body (1) is provided with a first section tube (2), a second section tube (3), a third section tube (4), a fourth section tube (5) and a fifth section tube (6) in sequence, a square tube (7) is provided at the internal position of the section tube, and an upper semicircular tube (10) and a lower semicircular tube (11) are provided on the upper and lower sides of the square tube (7), respectively.

2. A novel flute-type air flow meter according to claim 1, characterized in that: The square tube (7) is provided with square tube air inlet holes (15) on the upper and lower sides respectively, and the square tube air inlet holes (15) correspond to the air inlet pipe (9).

3. A novel flute-type air flow meter according to claim 2, characterized in that: The upper semicircular tube (10) and the lower semicircular tube (11) are respectively provided with a semicircular tube air inlet hole (14), and the semicircular tube air inlet hole (14) corresponds to the air inlet pipe (9).

4. A novel flute-type air flow meter according to claim 3, characterized in that: The Pitot tube body (1) is a combined structure, and the Pitot tube body (1) is made of stainless steel.

5. A novel flute-type air flow meter according to claim 1, characterized in that: Connecting flanges (8) are respectively arranged at the left and right sides of the joint pipe, and bolt holes (12) are arranged at the outer sides of the connecting flanges (8).

6. A novel flute-type air flow meter according to claim 5, characterized in that: Inlet pipe limiting holes (13) are respectively arranged on the upper and lower sides of the connecting flange (8) at the bottom of the section pipe, and the section pipes are bolted together through the bolt holes (12).

7. A novel flute-type air flow meter according to claim 1, characterized in that: The upper and lower sides of the Pitot tube body (1) are provided with equal-area circles, and the square tube and the semicircular tube are made of stainless steel.

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