A modular, low-drag, stable structure for measuring gas pressure

Abstract

This application provides a modular, low-resistance, stable gas pressure measurement structure, including a flange and a V-cone pressure tapping head. A first pressure tapping tube and a second pressure tapping tube are disposed through the side wall of the flange. A resistive pressure tapping diaphragm is provided in the pressure tapping chamber of the V-cone pressure tapping head. The inner end of the second pressure tapping tube is connected to the small end of the V-cone pressure tapping head. The air inlet pressure and the internal pressure of the V-cone pressure tapping head can be stably obtained through the first and second pressure tapping tubes, respectively, thereby reflecting the air flow rate through the pressure difference between the two pressures. At the same time, this structure can be directly installed on existing models through the flange, which is convenient for modification and has low cost. The internal pressure tapping components have low wind resistance and have little impact on the overall output of the fan. The modular design allows for the replacement of internal pressure tapping components to meet different models and operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of gas pressure measuring devices, specifically to a modular, low-resistance, stable structure for measuring gas pressure. Background Technology

[0002] Currently, the gas valve assemblies used in CZI series steam boilers basically only have the function of gas on / off switching. When the combustion state changes, the valve opening needs to be adjusted via VKP to increase or decrease the gas supply. When changes in air density or other reasons cause changes in air flow, the gas flow cannot be adjusted in real time, which will lead to changes in the air-fuel ratio and deviation from the optimal combustion state.

[0003] Our company plans to use Siemens SKP55 actuators to improve this situation. The SKP55 actuators can adjust the gas flow in real time according to changes in air flow, ensuring that the air-fuel ratio remains consistent regardless of load changes. However, the current CZI structure lacks suitable pressure tapping devices and points to obtain stable air pressure. While adding an air throttling orifice plate can achieve a stable air pressure difference, it will significantly increase intake resistance, increase power consumption, and may even necessitate replacing the blower with a higher-power one. Utility Model Content

[0004] In view of this, the embodiments of this utility model provide a modular, low-resistance, stable gas pressure measurement structure, which not only obtains stable air pressure, but also has the advantages of easy modification, low cost, low wind resistance, and minimal impact on the overall output of the fan.

[0005] This utility model provides a modular, low-resistance, stable gas pressure measurement structure, including a flange and a V-shaped pressure tap coaxially arranged with the flange. A first pressure tap and a second pressure tap are provided through the side wall of the flange, and the inner end of the second pressure tap extends radially toward the center of the flange. A pressure tapping cavity is formed inside the V-shaped pressure tap, and both ends of the V-shaped pressure tap are provided with openings communicating with the pressure tapping cavity. A resistive pressure tapping diaphragm separating the two ends is provided inside the pressure tapping cavity. The small end of the V-shaped pressure tap faces the windward side and communicates with the inner end of the second pressure tap.

[0006] Optionally, multiple first pressure taps are provided at circumferential intervals along the flange.

[0007] Optionally, the small end of the V-shaped pressure tapping head is detachably connected to the inner end of the second pressure tapping tube.

[0008] Optionally, the inner end of the second pressure tapping tube is provided with a connector, the inner cavity of which is connected to the second pressure tapping tube; the small end of the V-cone pressure tapping head is detachably connected to the connector and is connected to the inner cavity of the connector.

[0009] Optionally, the inner end of the first pressure tapping pipe extends radially toward the center of the flange and is connected to the connector; the windward side of the first pressure tapping pipe has a pressure tapping port communicating with its interior.

[0010] Optionally, two first pressure taps are symmetrically arranged, and two second pressure taps are symmetrically arranged, with the first and second pressure taps arranged in a cross shape.

[0011] Optionally, the flange is coaxially clamped between two adjacent sections of the duct, and the end face of the flange is sealed to the end face of the duct.

[0012] The present invention has the following advantages: A first pressure tapping pipe and a second pressure tapping pipe are installed through the side wall of the flange. The first pressure tapping pipe can stably obtain the air inlet pressure, and the second pressure tapping pipe is connected to the small end of the V-shaped pressure tapping head, which can stably obtain the internal pressure of the V-shaped pressure tapping head. These two pressures change linearly with the air velocity and density, so the air flow rate can be reflected by the pressure difference between the two pressures. Furthermore, this structure can be directly installed on existing models via the flange, making modification convenient and cost-effective. The internal pressure tapping components have low wind resistance, minimizing the impact on the overall output of the fan. The modular design allows for the replacement of internal pressure tapping components to meet different model and operating conditions. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of Embodiment 2 of this utility model; Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention; Figure 6 This is an assembly diagram of an embodiment of the present utility model; The numbers in the diagram represent: 1. Flange; 2. V-shaped tap head; 3. First tap tube; 4. Second tap tube; 5. Resistance tap diaphragm; 6. Connector; 7. Tap port; 8. Duct. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example 1

[0016] Please see Figure 1 , Figure 2 As shown, Embodiment 1 of this utility model provides a modular, low-resistance, stable gas pressure measurement structure, including a flange 1 and a V-shaped pressure tap 2 coaxially arranged with the flange 1.

[0017] A first pressure tapping pipe 3 and a second pressure tapping pipe 4 are provided through the side wall of the flange 1. The first pressure tapping pipe 3 is used to obtain the air inlet pressure. To prevent the pressure tapping result from being affected by the blockage of a single pressure tapping pipe, multiple first pressure tapping pipes 3 are arranged at intervals along the circumference of the flange 1 in this embodiment of the invention. A through hole can be directly opened on the side wall of the flange 1 to serve as the first pressure tapping pipe 3.

[0018] The V-shaped pressure tap 2 has a pressure tapping chamber inside. Both ends of the V-shaped pressure tap 2 have openings communicating with this chamber. The interaction of positive and negative pressure improves the stability of the pressure tapping. The smaller end of the V-shaped pressure tap 2 faces the windward side. The inner end of the second pressure tapping pipe 4 extends radially towards the center of the flange 1 and communicates with the smaller end of the V-shaped pressure tap 2, used to obtain the internal pressure of the V-shaped pressure tap 2. The air inlet pressure and the internal pressure of the V-shaped pressure tap 2 change linearly with changes in air velocity and density (the internal pressure of the V-shaped pressure tap 2 decreases sharply, but the trend of change is the same as the air inlet pressure on the windward side). Therefore, the pressure difference between these two pressures can reflect changes in airflow.

[0019] Specifically, the V-shaped pressure tap 2 has a resistive pressure tapping diaphragm 5 separating its two ends within its pressure tapping chamber. Pressure changes cause the resistive pressure tapping diaphragm 5 to deform, resulting in a change in resistance. The corresponding airflow can be calculated by reading the resistance signal. The V-shaped pressure tap 2 can adopt an internally inflatable flexible structure to facilitate the deformation of the resistive pressure tapping diaphragm 5. The openings at both ends of the V-shaped pressure tap 2 are relatively large to prevent dust blockage, improve service life, and extend maintenance cycles.

[0020] Furthermore, the small end of the V-cone pressure tap 2 is detachably connected to the inner end of the second pressure tapping tube 4 through threaded connection, plug-in connection, snap-fit ​​connection, etc., so that the appropriate model of V-cone pressure tap 2 can be replaced according to different air volume ranges to improve pressure tapping accuracy. Example 2

[0021] Please see Figures 3-5 As shown, Embodiment 2 of this utility model provides another modular, low-resistance, stable gas pressure measurement structure, which also includes a flange 1 and a V-shaped pressure tap 2 coaxially arranged with the flange 1.

[0022] A first pressure tapping pipe 3 and a second pressure tapping pipe 4 are installed through the side wall of the flange 1. The first pressure tapping pipe 3 is used to obtain the air inlet pressure. To prevent the pressure tapping result from being affected by the blockage of a single pressure tapping pipe, multiple first pressure tapping pipes 3 can be installed at intervals along the circumference of the flange 1.

[0023] The V-shaped pressure tap 2 has a pressure tapping chamber inside. Both ends of the V-shaped pressure tap 2 have openings that communicate with this pressure tapping chamber. The interaction of positive and negative pressure can improve the stability of pressure tapping. The small end of the V-shaped pressure tap 2 faces the windward side. The inner end of the second pressure tapping pipe 4 extends radially towards the center of the flange 1 and communicates with the small end of the V-shaped pressure tap 2 to obtain the internal pressure of the V-shaped pressure tap 2.

[0024] Specifically, the V-shaped pressure tap 2 has a resistive pressure tapping diaphragm 5 separating its two ends within its pressure tapping chamber. Pressure changes cause the resistive pressure tapping diaphragm 5 to deform, resulting in a change in resistance. The corresponding airflow can be calculated by reading the resistance signal. The V-shaped pressure tap 2 can adopt an internally inflatable flexible structure to facilitate the deformation of the resistive pressure tapping diaphragm 5. The openings at both ends of the V-shaped pressure tap 2 are relatively large to prevent dust blockage, improve service life, and extend maintenance cycles.

[0025] Furthermore, the small end of the V-cone pressure tap 2 is detachably connected to the inner end of the second pressure tapping tube 4, allowing for the replacement of the appropriate model of V-cone pressure tap 2 according to different airflow ranges, thereby improving pressure tapping accuracy. Specifically, in this embodiment of the invention, a connector 6 is provided at the inner end of the second pressure tapping tube 4, and the inner cavity of the connector 6 is connected to the second pressure tapping tube 4. The small end of the V-cone pressure tap 2 is detachably connected to the connector 6 and communicates with the inner cavity of the connector 6 through threaded connection, insertion, snap-fit, or other means.

[0026] Furthermore, the inner end of the first pressure tapping pipe 3 also extends radially towards the center of the flange 1 and is connected to the connector 6 (but not in a continuous manner) to support the V-shaped pressure tapping head 2 and ensure the stability of pressure tapping. The windward side of the first pressure tapping pipe 3 has a pressure tapping port 7 that communicates with its interior to obtain the air inlet pressure.

[0027] For reference, in this embodiment of the present invention, two pressure taps are symmetrically arranged for the first pressure tapping tube 3 and the second pressure tapping tube 4, and the first pressure tapping tube 3 and the second pressure tapping tube 4 are arranged in a cross shape, which can provide stable support for the V-shaped pressure tapping head 2.

[0028] like Figure 6 As shown (the same applies to Embodiment 1 and Embodiment 2), during use, the flange 1 is coaxially clamped between two adjacent sections of the duct 8 (with the small end of the V-cone pressure tap 2 facing the windward side). The internal pressure tapping components (first pressure tapping pipe 3, second pressure tapping pipe 4, and V-cone pressure tap 2) can stably measure the changing trend of the airflow at the fan inlet. This data is then fed back to the gas regulating valve in real time via a connecting pipe. When the airflow changes, the gas regulating valve automatically adjusts the gas flow according to the airflow, thereby ensuring the air-gas ratio. To prevent leakage, the end face of the flange 1 and the end face of the duct 8 must be sealed together using sealing structures such as sealing rings and sealing grooves during assembly.

[0029] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A modular, low-resistance, stable structure for measuring gas pressure, characterized in that: The device includes a flange and a V-shaped pressure tap coaxially arranged with the flange. A first pressure tap and a second pressure tap are provided through the side wall of the flange, and the inner end of the second pressure tap extends radially toward the center of the flange. A pressure tapping cavity is formed inside the V-shaped pressure tap, and both ends of the V-shaped pressure tap are provided with openings communicating with the pressure tapping cavity. A resistive pressure tapping diaphragm is provided inside the pressure tapping cavity to separate its two ends. The small end of the V-shaped pressure tap faces the windward side and is connected to the inner end of the second pressure tap.

2. The modular, low-resistance, stable gas pressure measurement structure according to claim 1, characterized in that: Multiple first pressure taps are provided at intervals along the circumference of the flange.

3. The modular, low-resistance, stable gas pressure measurement structure according to claim 1, characterized in that: The small end of the V-shaped pressure tap is detachably connected to the inner end of the second pressure tap tube.

4. The modular, low-resistance, stable gas pressure measurement structure according to claim 3, characterized in that: The inner end of the second pressure tapping tube is provided with a connector, and the inner cavity of the connector is connected to the second pressure tapping tube; the small end of the V-shaped pressure tapping head is detachably connected to the connector and is connected to the inner cavity of the connector.

5. The modular, low-resistance, stable gas pressure measurement structure according to claim 4, characterized in that: The inner end of the first pressure tapping pipe extends radially toward the center of the flange and is connected to the connector; the windward side of the first pressure tapping pipe has a pressure tapping port that communicates with its interior.

6. The modular, low-resistance, stable gas pressure measurement structure according to claim 5, characterized in that: Two first pressure taps are symmetrically arranged, and two second pressure taps are symmetrically arranged, with the first and second pressure taps arranged in a cross shape.

7. The modular, low-drag, stable pressure measurement structure of any of claims 1-6, wherein: The flange is coaxially clamped between two adjacent sections of the duct, and the end face of the flange is sealed to the end face of the duct.

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