Novel wind valve pitot tube pressure measuring structure

Abstract

This utility model discloses a novel Pitot tube pressure measurement structure for air valves, belonging to the field of air valve pressure measurement technology. The structure includes a ventilation duct, a Pitot tube assembly, and a pressure measuring device. The Pitot tube assembly is installed inside the ventilation duct, and the pressure measuring device is fixed outside the ventilation duct. The central tube in the Pitot tube assembly is divided into two chambers by a partition. The outer elliptical tubes are arranged in a cross shape and are sealed and connected to the chambers of the central tube. The ends of the elliptical tubes are provided with a total pressure inlet and a static pressure inlet, which are fixed and sealed by a support component. The port of the central tube is sealed by a pressure sealing component. The total pressure outlet tube and the static pressure outlet tube connect the central tube chamber to the pressure measuring device, and the sensor inside the pressure measuring device performs air pressure detection. This utility model uses an integral profile structure to ensure a fixed chamber distance, the elliptical tube structure facilitates positioning, and the intermediate pressure tapping method makes the pressure tapping more uniform, effectively improving the stability of differential pressure measurement and the accuracy of airflow calculation, making it suitable for scenarios involving precise airflow measurement of air valves.

Description

Technical Field

[0001] This utility model belongs to the field of air valve pressure measurement technology, specifically relating to a novel air valve Pitot tube pressure measurement structure. Background Technology

[0002] In the field of airflow measurement for dampers, pitot tubes are commonly used pressure measuring elements. Traditional pitot tube structures consist of two circular tubes, with total pressure and static pressure measured by drilling holes on the front and back of the tubes, respectively. However, this traditional structure has several drawbacks: First, the distance between the two circular tubes is prone to instability during installation, which can cause changes in the measured pressure difference and thus affect the accuracy of air volume calculation. Second, the structural characteristics of the circular tubes make installation and positioning difficult, and inaccurate positioning can also cause changes in pressure difference, which can adversely affect the accuracy of air volume. Third, the traditional Pitot tube uses a single-sided pressure tapping method, which makes it difficult to ensure the stability of pressure difference measurement, further reducing the reliability of air volume measurement. Utility Model Content

[0003] To address the problems of unstable installation distance, difficult positioning, and poor pressure measurement stability in traditional Pitot tube pressure measurement structures, which affect the accuracy of air volume measurement, this invention provides a novel air valve Pitot tube pressure measurement structure to improve the stability of differential pressure measurement and the accuracy of air volume calculation.

[0004] This utility model is implemented as follows: a novel air valve Pitot tube pressure measuring structure includes a ventilation duct, a Pitot tube assembly installed inside the ventilation duct, and a pressure measuring device installed outside the ventilation duct. The Pitot tube assembly includes: The central tube is located in the center of the ventilation duct, and it has two chambers, one above the other. Elliptical tubes are arranged in a cross shape around the outside of the central tube. The elliptical tubes have upper and lower channels that are independently connected to two chambers inside the central tube. The upper and lower ends of the elliptical tubes away from the central tube are respectively provided with a full pressure air inlet and a static pressure air inlet. The supporting component seals and supports the end of the elliptical tube away from the central tube within the ventilation duct. The sealing component seals the upper and lower ports of the central tubes of the two chambers; The total pressure lead-out tube connects the upper chamber of the central tube to the pressure measuring device for total pressure testing; The static pressure lead-out tube connects the lower chamber of the central tube to the pressure measuring device for static pressure detection; Seal the connection between the elliptical tube and the central tube.

[0005] Preferably, the inner side of the central tube is provided with a partition, which divides the internal space of the central tube into upper and lower chambers. The partition is provided with a cone at the center of the upper and lower chambers, and the outer side of the central tube is provided with an elliptical sleeve for installing an elliptical tube.

[0006] Preferably, one end of the elliptical tube is inserted into the elliptical sleeve.

[0007] Preferably, the support component includes a support foot, the support foot is filled with a sealing pad, one end of the elliptical tube is inserted into the support foot and presses the sealing pad, and the support foot is fixed to the ventilation duct by screws.

[0008] Preferably, the sealing component includes an end cap, which is press-fitted into the port of the central tube, and a sealing ring is filled in the contact gap between the end cap and the central tube. A screw passes through the center of the end cap from the outside, and the screw is threaded to the cone. The end cap is a conical structure with a central opening and a rubber stopper is filled in the opening.

[0009] Preferably, the plug is filled inside the elliptical sleeve, the elliptical sleeve presses the plug tightly, and the plug has a bidirectional through hole that allows the upper and lower channels of the elliptical sleeve to communicate with the two chambers of the elliptical sleeve.

[0010] Preferably, the pressure measuring device includes a mounting base and a controller, wherein the controller is fixed to the outside of the ventilation duct via the mounting base.

[0011] Preferably, the controller is equipped with a total pressure sensor and a static pressure sensor to detect the output air pressure of the total pressure outlet pipe and the static pressure outlet pipe, respectively.

[0012] Compared with related technologies, the novel air valve Pitot tube pressure measuring structure provided by this utility model has the following beneficial effects: 1. The present invention adopts an integral profile structure, which can ensure that the distance between the front and rear cavities remains constant, which is conducive to the stability of the differential pressure coefficient; the elliptical Pitot tube structure is easy to install and position, providing a more reliable guarantee for the stability of the measured differential pressure; the use of intermediate pressure tapping method results in more uniform pressure tapping, making the air volume calculation more accurate.

[0013] 2. The innovation of this structure provides a strong guarantee for improving the accuracy of the flow valve, and at the same time, it is more conducive to ensuring the consistency of mass production, and has good prospects for industrial application. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the installation of a novel air valve Pitot tube pressure measuring structure proposed in this utility model; Figure 2 This is a schematic diagram of the Pitot tube assembly proposed in this utility model; Figure 3This is a disassembly diagram of the Pitot tube assembly proposed in this utility model; Figure 4 This is a half-sectional schematic diagram of the central tube proposed in this utility model; Figure 5 This is a half-sectional schematic diagram of the elliptical tube proposed in this utility model.

[0015] In the diagram: 1. Ventilation duct; 2. Pressure measuring device; 21. Mounting base; 22. Controller; 3. Pitot tube assembly; 31. Central tube; 311. Partition plate; 312. Elliptical sleeve; 313. Cone; 32. Elliptical tube; 321. Total pressure air inlet; 322. Static pressure air inlet; 33. Support component; 331. Support foot; 332. Sealing foot pad; 34. Sealing component; 341. End cap; 342. Screw; 343. Sealing ring; 344. Rubber plug; 35. Total pressure outlet pipe; 36. Static pressure outlet pipe; 37. Seal. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments, so that those skilled in the art can understand it.

[0017] Please see Figures 1-5 A novel pressure measuring structure for a ventilation valve and Pitot tube includes a ventilation duct 1, a Pitot tube assembly 3 installed inside the ventilation duct 1, and a pressure measuring device 2 installed outside the ventilation duct 1. The specific structure is as follows: The Pitot tube assembly 3 consists of a central tube 31, an elliptical tube 32, a support component 33, a sealing component 34, a total pressure outlet tube 35, and a static pressure outlet tube 36.

[0018] The central tube 31 is located in the center of the ventilation duct 1. It has a partition 311 inside, which divides the internal space of the central tube 31 into upper and lower chambers. The partition 311 is located in the center of the upper and lower chambers and has a cone 313. The outer side of the central tube 31 is provided with an elliptical sleeve 312 for installing the elliptical tube 32.

[0019] Elliptical tubes 32 are arranged in a cross shape around the center tube 31. One end of the elliptical tube 32 is inserted into the elliptical sleeve 312. The elliptical tube 32 has upper and lower channels that are independently connected to two chambers in the center tube 31. The end of the elliptical tube 32 away from the center tube 31 is provided with a full pressure air inlet 321 and a static pressure air inlet 322 at the top and bottom, respectively.

[0020] The support component 33 includes a support foot 331, a sealing pad 332 is filled inside the support foot 331, one end of the elliptical tube 32 is inserted into the support foot 331 and presses the sealing pad 332 tightly, and the support foot 331 is fixed to the ventilation duct 1 by screws so as to close the end of the elliptical tube 32 away from the central tube 31 and support it in the ventilation duct 1.

[0021] The sealing component 34 includes an end cap 341, which is press-fitted into the port of the central tube 31. A sealing ring 343 is filled in the contact gap between the end cap 341 and the central tube 31. A screw 342 passes through the center of the end cap 341 from the outside. The screw 342 is threadedly connected to the cone 313. The end cap 341 is a conical structure with a central opening and a rubber stopper 344 is filled in the opening to seal the upper and lower ports of the central tube 31.

[0022] The total pressure lead-out tube 35 connects the upper chamber of the central tube 31 to the pressure measuring device 2 for total pressure testing; the static pressure lead-out tube 36 connects the lower chamber of the central tube 31 to the pressure measuring device 2 for static pressure testing.

[0023] The plug 37 is filled into the elliptical sleeve 312, and the elliptical tube 32 presses the plug 37 tightly. The plug 37 has a bidirectional through hole that connects the upper and lower channels of the elliptical tube 32 with the two chambers of the central tube 31, and is used to seal the connection between the elliptical tube 32 and the central tube 31.

[0024] The pressure measuring device 2 includes a mounting base 21 and a controller 22. The controller 22 is fixed to the outside of the ventilation duct 1 through the mounting base 21. The controller 22 is equipped with a total pressure sensor and a static pressure sensor to detect the output air pressure of the total pressure outlet pipe 35 and the static pressure outlet pipe 36, respectively.

[0025] During installation, the elliptical tubes 32, arranged in a cross shape, are connected to the central tube 31 via elliptical sleeves 312. A sealing plug 37 is inserted into the elliptical sleeve 312 to ensure precise and sealed communication between the upper and lower channels of the elliptical tubes 32 and the two chambers of the central tube 31. Support feet 331 are fixed to the ventilation duct 1 with screws. The end of the elliptical tube 32 furthest from the central tube 31 is inserted into the support feet 331 and the sealing foot pad 332 is pressed tightly to achieve end sealing and support. When installing the sealing component 34, the end cap 341 is pressed into the port of the central tube 31. A sealing ring 343 is placed at the contact gap. The end cap 341 is fixedly connected to the cone 313 with screws 342. Finally, a rubber plug 344 is inserted into the central hole of the end cap 341 to complete the sealing. The total pressure outlet pipe 35 and the static pressure outlet pipe 36 are respectively connected to the upper and lower chambers of the central tube 31 and to the total pressure sensor and static pressure sensor of the controller 22. The controller 22 is fixed to the outside of the ventilation duct 1 via the mounting bracket 21. The total pressure sensor and static pressure sensor inside the controller 22 detect the total pressure and static pressure respectively, thereby achieving accurate airflow calculation. In practical applications, the cross-shaped elliptical tubes 32 intake air through the total pressure inlet 321 and the static pressure inlet 322, and then take pressure through the two chambers of the central tube 31. The integral structure ensures the stability of the chamber distance, and the elliptical tube structure improves the accuracy of installation and positioning, ultimately improving the stability of differential pressure measurement and the accuracy of airflow calculation.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A novel air valve Pitot tube pressure measuring structure, comprising a ventilation duct (1), a Pitot tube assembly (3) installed inside the ventilation duct (1), and a pressure measuring device (2) installed outside the ventilation duct (1), characterized in that, The pitot tube group (3) includes: The central tube (31) is located in the center of the ventilation duct (1) and has two chambers, an upper and a lower one. Elliptical tubes (32) are arranged in a cross shape around the outside of the central tube (31). The elliptical tubes (32) have upper and lower channels that are independently connected to two chambers inside the central tube (31). The upper and lower ends of the elliptical tubes (32) away from the central tube (31) are respectively provided with a full pressure air inlet (321) and a static pressure air inlet (322). The support component (33) closes off one end of the elliptical tube (32) away from the central tube (31) and supports it inside the ventilation duct (1); The sealing component (34) seals the upper and lower ports of the two chamber center tubes (31); The full pressure lead-out tube (35) connects the upper chamber of the central tube (31) to the pressure measuring device (2) for full pressure detection; The static pressure lead-out pipe (36) connects the lower chamber of the central tube (31) to the pressure measuring device (2) for static pressure detection; Seal (37) to seal the connection between the elliptical tube (32) and the central tube (31).

2. The novel air valve Pitot tube pressure measuring structure according to claim 1, characterized in that, The inner side of the central tube (31) is provided with a partition (311), which divides the internal space of the central tube (31) into two chambers, an upper and a lower chamber. The partition (311) is provided with a cone (313) at the center of the upper and lower chambers. The outer side of the central tube (31) is provided with an elliptical sleeve (312) for installing an elliptical tube (32).

3. The novel air valve Pitot tube pressure measuring structure according to claim 2, characterized in that, One end of the elliptical tube (32) is inserted into the elliptical sleeve (312).

4. The novel air valve Pitot tube pressure measuring structure according to claim 1, characterized in that, The support component (33) includes a support foot (331), and a sealing pad (332) is filled inside the support foot (331). One end of the elliptical tube (32) is inserted into the support foot (331) and presses the sealing pad (332) tightly. The support foot (331) is fixed inside the ventilation duct (1) by screws.

5. The novel air valve Pitot tube pressure measuring structure according to claim 2, characterized in that, The sealing component (34) includes an end cap (341), which is press-fitted into the port of the central tube (31), and a sealing ring (343) is filled in the contact gap between the end cap (341) and the central tube (31). A screw (342) is inserted through the center of the end cap (341) from the outside. The screw (342) is threaded to the cone (313). The end cap (341) is a conical structure with a central opening and a rubber stopper (344) is filled in the opening.

6. The novel air valve Pitot tube pressure measuring structure according to claim 2, characterized in that, The plug (37) is filled inside the elliptical sleeve (312), and the elliptical tube (32) presses the plug (37) together. The plug (37) has a bidirectional through hole that allows the upper and lower channels of the elliptical tube (32) to communicate with the two chambers of the elliptical tube (32).

7. The novel air valve Pitot tube pressure measuring structure according to claim 1, characterized in that, The pressure measuring device (2) includes a mounting base (21) and a controller (22), wherein the controller (22) is fixed to the outside of the ventilation duct (1) via the mounting base (21).

8. The novel air valve Pitot tube pressure measuring structure according to claim 7, characterized in that, The controller (22) is equipped with a total pressure sensor and a static pressure sensor to detect the output air pressure of the total pressure outlet pipe (35) and the static pressure outlet pipe (36), respectively.

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