Wind pressure measuring device

Abstract

The present invention relates to a wind pressure measuring device for measuring the wind pressure in an exhaust duct, which comprises a lever, a counterweight, a pressure sensor and a blade, wherein the counterweight and the blade are respectively mounted on both sides of the fulcrum of the lever so that the lever is in a balanced position, the blade is horizontally arranged in the vertical section of the exhaust duct and is provided with a plurality of through holes, and the pressure sensor is mounted between the fulcrum and the exhaust duct, with its sensing surface facing downward and in contact with the lever. The blade with through holes can effectively reduce the positive impact and swirl impact of the fluid, reduce the fluctuation of the blade, obtain a relatively stable pressure signal, and thus achieve a good automatic exhaust control effect, and the pressure sensor is located outside the exhaust duct, which greatly reduces the maintenance cost and improves the use efficiency.

Description

Technical Field

[0001] The invention relates to a wind pressure measuring device, in particular to a wind pressure measuring device used for measuring the exhaust volume in an exhaust duct. Background Art

[0002] In the printing exhaust gas emission system, the pressure in the exhaust duct is mainly detected by the pressure sensor installed in the exhaust duct, and then the exhaust gas flow and flow rate in the exhaust duct are obtained. The detection port is easily affected by dust and smoke particles. Accumulated dust, stains, etc. block the detection port, resulting in distortion of detection data. In addition, due to fluctuation factors such as impact and swirl of air flow, the pressure sensor detection data has large deviation and fluctuation, which affects the automatic exhaust control effect and even out of control. Summary of the invention

[0003] The present invention aims to provide a wind pressure measuring device to solve the above problems. To this end, the specific technical solutions adopted by the present invention are as follows:

[0004] A wind pressure measuring device, used to measure the wind pressure in an exhaust duct, characterized in that it includes a lever, a counterweight, a pressure sensor and a blade, the counterweight and the blade are respectively installed on both sides of the fulcrum of the lever so that the lever is in a balanced position, the blade is horizontally arranged in the vertical section of the exhaust duct and is provided with a plurality of through holes, and the pressure sensor is installed between the fulcrum and the exhaust duct, with its sensing surface facing downward and in contact with the lever.

[0005] Furthermore, the blade is welded to the lever.

[0006] Furthermore, the distance between the pressure sensor and the fulcrum is greater than the distance between the pressure sensor and the exhaust pipe.

[0007] Furthermore, a mounting bracket of the pressure sensor is fixed on the exhaust pipe.

[0008] Furthermore, the fulcrum is composed of a fixing frame, a shaft, a bearing and a sleeve, the fixing frame is fixed on the exhaust pipe, the shaft is fixed on the fixing frame, the inner ring of the bearing is fixed on the shaft, the outer ring of the bearing is fixed in the sleeve, and the lever is fixedly connected to the sleeve.

[0009] Furthermore, the lever includes a first part and a second part located on both sides of the fulcrum, the first part is welded to the sleeve, and the counterweight is installed on the first part; the second part is a telescopic structure, including a tubular part welded to the sleeve and a rod-shaped part telescopically inserted into the tubular part, and the blade is welded to the end of the rod-shaped part.

[0010] Furthermore, the tubular part and the rod-shaped part are retractably fixedly connected via a top screw and a screw hole.

[0011] Further, the counterweight block is slidably positioned on the lever.

[0012] Furthermore, the counterweight block has an axial screw hole and a radial through hole, the lever passes through the radial through hole, and the counterweight block is fixed to the lever by screwing the top screw into the axial screw hole.

[0013] Furthermore, the blades are elliptical in shape, and the through holes are arranged in an array.

[0014] Furthermore, the lever and the exhaust pipe are sealed by an O-ring.

[0015] Furthermore, the surface of the blade is sprayed with an antifouling coating.

[0016] The present invention adopts the above technical solution, which has the beneficial effect of: through the blades with through holes, the positive impact and swirl impact of the fluid can be effectively reduced, the fluctuation of the blades can be reduced, and a relatively stable pressure signal can be obtained, thereby achieving a good automatic exhaust control effect, and the pressure sensor is located outside the exhaust duct, which greatly reduces the maintenance cost and improves the utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0018] Figure 1 is a stereogram of the present invention;

[0019] Figure 2 It is a partial exploded view of the present invention. DETAILED DESCRIPTION

[0020] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0021] like Figure 1 and 2As shown, a wind pressure measuring device is used to measure the wind pressure in an exhaust duct (specifically, a printing exhaust gas exhaust duct). The wind pressure measuring device may include a lever 1, a counterweight 2, a pressure sensor 3 and a blade 4, wherein the counterweight 2 and the blade 4 are respectively mounted on both sides of the fulcrum of the lever 1, so that the lever 1 is in a balanced position. That is, the weight of the blade 4 can be offset by the counterweight 2, thereby obtaining the real wind pressure. The blade 4 is horizontally arranged in the vertical section of the exhaust duct 100 and is provided with a plurality of through holes 41. The pressure sensor 3 is installed (through a mounting bracket 5) between the fulcrum of the lever 1 and the exhaust duct 100, with its sensing surface facing downward and in contact with the lever 1. According to the principle of gravity and lever torque, the position of the counterweight 2 is adjusted so that the lever 1, the blade 4 and the counterweight 2 are in a balanced state under a static condition, thereby offsetting the gravity of the blade 4, so that the force on the blade 4 is the upward pressure exerted on it by the flowing gas, and the obtained upward pressure acts on the pressure sensor 3, and the accurate wind pressure in the exhaust duct 100 can be obtained by the conversion of the torque. The present invention uses blades with through holes 41 to effectively reduce the positive impact and swirl impact of the airflow, reduce the fluctuation of the blades, and obtain a relatively stable pressure signal, thereby achieving a good automatic exhaust control effect. The pressure sensor is located outside the exhaust duct, which greatly reduces maintenance costs and improves usage efficiency.

[0022] In this embodiment, the lever 1 includes a movable fulcrum 11 and a first part 12 and a second part 13 located on both sides of the fulcrum 11. Specifically, the fulcrum 11 is composed of a fixing frame 111, a shaft 112, a bearing 113 and a sleeve 114. The fixing frame 111 is fixed to the exhaust pipe 100, for example, by screws or welding. The structure of the fixing frame 111 is not limited to the illustrated embodiment. The shaft 112 is fixed to the fixing frame 111, specifically, plugged into the sockets of the fixing frames 111 on both sides. The inner ring of the bearing 113 is fixed to the shaft 112, and the outer ring of the bearing 113 is fixed in the sleeve 114. The first part 12 is fixedly connected (for example, welded) to the sleeve 114, and the counterweight 2 is mounted on the first part 12; the second part 13 is a telescopic structure, that is, the length is adjustable, including a tubular part 131 welded to the sleeve 114 and a rod-shaped part 132 telescopically plugged into the tubular part 131, and the blade 4 is welded to the end of the rod-shaped part 132. Specifically, the tubular portion 131 and the rod-shaped portion 132 are retractably fixedly connected via the top screw and the screw hole to facilitate the installation of the blade 4. It can be understood that the length of the second portion 13 can also be fixed.

[0023] In order to reduce the swing amplitude of the lever 1, the distance between the pressure sensor 3 and the fulcrum 11 is greater than the distance from the exhaust pipe 100. Preferably, the pressure sensor 3 is close to the exhaust pipe 100 so that the swing amplitude of the lever 1 is close to zero. An O-ring (not shown) is installed at the joint between the lever 1 and the exhaust pipe 100 to prevent gas leakage from affecting the measurement accuracy of the pressure sensor 3.

[0024] In the present embodiment, the counterweight 2 is slidably positioned on the lever 1. Specifically, the counterweight 2 has an axial screw hole 21 and a radial through hole 22. The lever 1 (specifically, the first part 12) passes through the radial through hole 22, and the counterweight 2 is fixed to the lever 1 by screwing the top screw into the axial screw hole 21. When the position of the counterweight 2 needs to be adjusted, the top screw is loosened, moved to the equilibrium position (at this time, the detection value of the pressure sensor 3 is 0), and then the top screw is tightened, which is very convenient. In the illustrated embodiment, the counterweight 2 is in the shape of a weight (cylindrical). It can be understood that the counterweight 2 can also be in other shapes, such as a cuboid or a cube.

[0025] In this embodiment, the mounting bracket 5 of the pressure sensor 3 is fixed (for example, by welding or screws) on the exhaust pipe 100. The structure of the mounting bracket 5 can be designed according to the shape and structure of the pressure sensor 3, which will not be described here.

[0026] In this embodiment, the blade 4 is elliptical. It is understood that the blade 4 can also be rectangular, circular or racetrack shaped. The through holes 41 are arranged in an array, and the number thereof can be set according to the size and shape of the blade 4. In this embodiment, there are three rows of through holes 41, and the number of each row is 5, 7, and 5 respectively.

[0027] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A wind pressure measuring device for measuring wind pressure in an exhaust duct, characterized in that: It includes a lever, a counterweight, a pressure sensor and a blade, wherein the counterweight and the blade are respectively mounted on both sides of the fulcrum of the lever so that the lever is in a balanced position, the blade is horizontally arranged in the vertical section of the exhaust pipe and is provided with a plurality of through holes, the pressure sensor is mounted between the fulcrum and the exhaust pipe, with its sensing surface facing downward and in contact with the lever; the distance between the pressure sensor and the fulcrum is greater than the distance between the pressure sensor and the exhaust pipe; the lever includes a first part and a second part located on both sides of the fulcrum, the counterweight is mounted on the first part; the second part is a telescopic structure, including a tubular part and a rod-shaped part telescopically plugged into the tubular part, and the blade is welded to the end of the rod-shaped part.

2. The wind pressure measuring device according to claim 1, characterized in that: The mounting bracket of the pressure sensor is fixed on the exhaust pipe.

3. The wind pressure measuring device according to claim 1, characterized in that: The fulcrum is composed of a fixing frame, a shaft, a bearing and a sleeve. The fixing frame is fixed on the exhaust pipe, the shaft is fixed on the fixing frame, the inner ring of the bearing is fixed on the shaft, the outer ring of the bearing is fixed in the sleeve, and the lever is fixedly connected to the sleeve.

4. The wind pressure measuring device according to claim 3, characterized in that: The first portion is welded to the sleeve, and the tubular portion is welded to the sleeve.

5. The wind pressure measuring device according to claim 4, characterized in that: The tubular part and the rod-shaped part are retractably fixedly connected via a top screw and a screw hole.

6. The wind pressure measuring device according to claim 1, characterized in that: The counterweight is slidably positioned on the lever.

7. The wind pressure measuring device according to claim 6, characterized in that: The counterweight block has an axial screw hole and a radial through hole, the lever passes through the radial through hole, and the counterweight block is fixed on the lever by screwing the top screw into the axial screw hole.

8. The wind pressure measuring device according to claim 1, characterized in that: The blades are elliptical in shape, and the through holes are arranged in an array.

Images