A sealing device for a circular backrest tube

Abstract

This utility model discloses a sealing device for a circular backrest tube, including a backrest tube body and a pipeline ball valve sealed to the pressure measuring port of the pulverized coal flow pipeline. The sealing device includes a sealing component threaded to one end of the pipeline ball valve and a compression component. This utility model allows for manual opening of the pipeline ball valve, inserting the backrest tube body through the valve into the pulverized coal pipeline. Manual rotation of the tightening ring drives the compression stud to rotate within the placement groove. During rotation, the compression stud extends towards the sealing ring. Under the compression of the compression stud, the narrow opening in the center of the sealing ring undergoes a certain degree of contraction and deformation, thus tightly wrapping around the outer wall of the backrest tube body, achieving a complete seal between the backrest tube body and the pulverized coal pipeline. This prevents the leakage of primary air and the air-powder mixture, thereby making the wind speed measurement of the pulverized coal pipeline more accurate.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically a sealing device for a circular backrest tube. Background Technology

[0002] The uniformity of air velocity in the pulverized coal pipelines of a thermal power plant directly affects the safety, economy, and reliability of the unit. The main means of ensuring the uniformity of the pulverized coal pipelines is air volume leveling. Cold-state primary air leveling must be performed before boiler startup, and hot-state primary air leveling tests, as well as pulverized coal fineness adjustment tests, must be performed after startup. Conducting cold and hot-state primary air leveling tests requires inserting a backing pipe into the pulverized coal pipeline and measuring the total pressure and static pressure at the equal area integrator points.

[0003] When adjusting the airflow in a pulverized coal pipeline, a backrest tube needs to be inserted into the pipeline to measure the total pressure and static pressure using a U-shaped measuring tube at the end. However, at the connection point of the backrest tube inserted into the pipeline, the lack of a sealing device may cause primary air and air-powder mixture to overflow, affecting the accuracy of the total pressure and static pressure measurements. Therefore, we propose a sealing device for a circular backrest tube to solve this problem. Utility Model Content

[0004] The purpose of this invention is to provide a sealing device for a circular backrest tube to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing device for a circular backrest tube, comprising a backrest tube body, a three-way connecting pipe sealed to one end of the backrest tube body, and a U-shaped measuring tube sealed to the output port of the three-way connecting pipe, and further comprising:

[0006] Pipeline ball valve, sealed connection to the pressure measuring port of the pulverized coal flow rate pipeline;

[0007] A sealing device, comprising a sealing assembly threaded to one end of a pipeline ball valve and a compression assembly for compressing the sealing assembly.

[0008] Preferably, the sealing assembly includes a sealing connecting pipe, a sealing ring, and a placement groove. One end of the sealing connecting pipe is threaded to one end of the pipeline ball valve, and the backing pipe body can penetrate the interior of the sealing connecting pipe and the pipeline ball valve. The backing pipe body can extend into the pulverized coal flow pipeline. The placement groove is opened at the end of the sealing connecting pipe away from the pipeline ball valve. The sealing ring is embedded in the placement groove, and the shape of the sealing ring is a structure of "both ends are conical and extend inward symmetrically before connecting". The backing pipe body can penetrate the interior of the sealing ring.

[0009] Preferably, the extrusion assembly includes a tightening ring and an extrusion stud. The tightening ring is disposed at one end of the sealing connection tube, and the outer wall of the tightening ring is evenly provided with anti-slip texture. The extrusion stud is fixed at one end of the tightening ring and can be threaded onto the inner wall of the placement groove. One end of the extrusion stud is in contact with the sealing ring, and the backing tube can penetrate the interior of the extrusion stud and the tightening ring.

[0010] Preferably, a total pressure measuring tube is sealed and connected to the end of the back tube body away from the tee connecting pipe, and the opening of the total pressure measuring tube is directly facing the flow velocity direction of the pulverized coal flow pipeline. A static pressure measuring tube is sealed and connected to the end of the back tube body away from the tee connecting pipe, and the static pressure measuring tube is located on the same side as the total pressure measuring tube, and the opening of the static pressure measuring tube is perpendicular to the flow velocity direction of the pulverized coal flow pipeline.

[0011] Preferably, a partition plate is fixed in the center of the back tube, and the partition plate can separate the air inlets of the total pressure test tube and the static pressure test tube, so that the total pressure test tube and the static pressure test tube can flow to the two output ports of the three-way connecting pipe respectively.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In use, this invention involves manually opening the pipeline ball valve and inserting the backrest tube through the valve into the pulverized coal pipeline. Then, the operator can manually rotate the tightening ring to rotate the extrusion stud within the placement groove. During rotation, the extrusion stud extends towards the sealing ring. Under the pressure of the extrusion stud, the narrow opening in the center of the sealing ring undergoes a certain degree of contraction and deformation, thus tightly wrapping around the outer wall of the backrest tube, achieving a complete seal between the backrest tube and the pulverized coal pipeline. This prevents the leakage of primary air and the air-powder mixture, thereby making the wind speed measurement of the pulverized coal pipeline more accurate. Attached Figure Description

[0014] Figure 1 This is a top view of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the exploded structure of the sealing device of this utility model;

[0016] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0017] In the diagram: 1. Backrest tube; 2. Tee connecting tube; 3. U-shaped measuring tube; 4. Pipe ball valve; 5. Sealing connecting tube; 6. Sealing ring; 7. Tightening ring; 8. Extrusion stud; 9. Placement groove; 10. Divider plate; 11. Total pressure measuring tube; 12. Static pressure measuring tube. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] Please see Figure 1-3 This utility model provides a sealing device for a circular backrest tube, including a backrest tube body 1, a three-way connecting pipe 2 sealed to one end of the backrest tube body 1, and a U-shaped measuring pipe 3 sealed to the output port of the three-way connecting pipe 2. It also includes: a total pressure measuring pipe 11 sealed to the end of the backrest tube body 1 away from the three-way connecting pipe 2, with the opening direction of the total pressure measuring pipe 11 being the same as the flow velocity direction of the pulverized coal flow velocity pipeline; and a static pressure measuring pipe 12 sealed to the end of the backrest tube body 1 away from the three-way connecting pipe 2. 2 is located on one side of the total pressure measuring tube 11, and the direction of the inlet of the static pressure measuring tube 12 is perpendicular to the flow velocity direction of the pulverized coal flow pipeline. A partition plate 10 is fixed in the center of the interior of the back-side tube body 1, and the partition plate 10 can separate the air inlets of the total pressure measuring tube 11 and the static pressure measuring tube 12. The total pressure measuring tube 11 and the static pressure measuring tube 12 can flow to the two output ports of the three-way connecting pipe 2 respectively. The pressure measuring principle of the back-side tube body 1 of the pulverized coal pipeline is mainly based on Bernoulli's equation. Through the total pressure measuring tube 11 and the static pressure measuring tube 12 at the front end of the back-side tube body 1, the pressure is measured. The measuring tube 12 measures the total pressure and static pressure inside the pulverized coal pipeline to determine parameters such as air velocity. The total pressure measuring tube 11 faces the airflow direction in the pulverized coal pipeline and is used to sense the airflow impact and measure the total energy of the airflow, i.e., the total pressure. When the airflow passes through the total pressure measuring tube 11, the kinetic energy and pressure energy of the airflow work together to increase the pressure inside the U-shaped measuring tube 3. This pressure value reflects the magnitude of the total energy of the airflow. The static pressure measuring tube 12 is located on the side of the total pressure measuring tube 11, perpendicular to the airflow direction, and is used to measure the airflow... The static pressure is measured by the static pressure measuring tube 12, which is not directly impacted by the airflow. The measured pressure is primarily the static pressure of the airflow, reflecting the pressure potential energy of the airflow at that point in the pulverized coal pipeline. According to Bernoulli's equation, there is a certain relationship between the difference between total pressure and static pressure and the flow velocity at different cross-sections of the airflow. When the airflow in the pulverized coal pipeline flows through the back pipe, at the total pressure measuring tube, the total pressure of the airflow is Ptotal = Pdynamic + Pstatic, where Ptotal is the total pressure and Pstatic is the static pressure. At the static pressure measuring tube 12, the measured pressure is only Pstatic. Therefore, by measuring the pressure difference Ptotal - Pstatic = Pdynamic between the total pressure measuring tube 11 and the static pressure measuring tube 12, the dynamic pressure of the airflow can be obtained. Given the density of the gas medium, the wind speed can be derived from the formula for calculating total pressure. By using the measured total pressure value and the known density of the gas medium, the wind speed in the pulverized coal pipeline can be calculated.

[0020] The pipeline ball valve 4 is sealed and connected to the pressure measuring port of the pulverized coal flow rate pipeline. The pipeline ball valve 4 can be manually rotated and opened. The original plug sealing method was more troublesome to disassemble and it was difficult to quickly insert the backing pipe 1 into the pulverized coal pipeline. The mechanical pipeline ball valve 4 can be opened much faster.

[0021] The sealing device includes a sealing assembly threaded to one end of a pipe ball valve 4 and a compression assembly for compressing the sealing assembly. The sealing assembly includes a sealing connecting pipe 5, a sealing ring 6, and a placement groove 9. One end of the sealing connecting pipe 5 is threaded to one end of the pipe ball valve 4, and the backing pipe 1 can penetrate the interior of the sealing connecting pipe 5 and the pipe ball valve 4. The backing pipe 1 can extend into the pulverized coal flow pipeline. The placement groove 9 is located at the end of the sealing connecting pipe 5 away from the pipe ball valve 4. The sealing ring 6 is embedded in the placement groove 9, and the shape of the sealing ring 6 is "conical at both ends and symmetrically extended inwards before connecting". The backing pipe 1 can penetrate the interior of the sealing ring 6. The placement groove 9 is used to place the sealing ring 6, and the middle part of the sealing ring 6 can undergo a certain deformation under the action of the subsequent compression assembly. The compression assembly includes a tightening ring 7 and a compression stud 8. The tightening ring 7 is located at one end of the sealing connecting pipe 5 and is tightened... The outer wall of the ring 7 is evenly provided with anti-slip texture. The extrusion stud 8 is fixed to one end of the tightening ring 7 and can be threaded onto the inner wall of the placement groove 9. One end of the extrusion stud 8 is in contact with the sealing ring 6. The backrest tube 1 can pass through the interior of the extrusion stud 8 and the tightening ring 7. In use, the backrest tube 1 is inserted into the pulverized coal pipeline by manually opening the pipeline ball valve 4. Then, the extrusion stud 8 can be rotated in the placement groove 9 by manually rotating the tightening ring 7. During the rotation, the extrusion stud 8 can extend towards the sealing ring 6. Under the extrusion of the extrusion stud 8, the narrow opening in the middle of the sealing ring 6 can undergo a certain shrinkage deformation, which can then tightly wrap around the outer wall of the pipeline of the backrest tube 1, achieving a complete seal between the backrest tube 1 and the pulverized coal pipeline, avoiding the leakage of primary air and air-powder mixture, thus making the wind speed measurement of the pulverized coal pipeline more accurate.

[0022] Working principle: First, the pipeline ball valve 4 is sealed and connected to the pressure measuring port of the pulverized coal flow rate pipeline. The pipeline ball valve 4 can be manually rotated and opened. The original plug sealing method is more troublesome to disassemble and makes it difficult to quickly insert the backing pipe 1 into the pulverized coal pipeline. The mechanical pipeline ball valve 4 opens much faster.

[0023] In use, the ball valve 4 of the pipeline is manually opened, and the backrest tube 1 is inserted through the ball valve 4 into the pulverized coal pipeline. Then, the tightening ring 7 is turned manually to drive the extrusion stud 8 to rotate in the placement groove 9. During the rotation, the extrusion stud 8 can extend towards the sealing ring 6. Under the extrusion of the extrusion stud 8, the narrow opening in the middle of the sealing ring 6 can undergo a certain shrinkage deformation, thus tightly wrapping around the outer wall of the backrest tube 1, achieving a complete seal between the backrest tube 1 and the pulverized coal pipeline, preventing the leakage of primary air and air-pulverized coal mixture, thereby making the wind speed measurement of the pulverized coal pipeline more accurate.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device for a circular backrest tube, comprising a backrest tube body (1), a three-way connecting pipe (2) sealingly connected to one end of the backrest tube body (1), and a U-shaped measuring pipe (3) sealingly connected to the output port of the three-way connecting pipe (2), characterized in that: Pipeline ball valve (4) is sealed and connected to the pressure measuring port of the pulverized coal flow rate pipeline; The sealing device includes a sealing assembly threaded to one end of the pipe ball valve (4) and a compression assembly for compressing the sealing assembly; The sealing assembly includes a sealing connecting pipe (5), a sealing ring (6), and a placement groove (9). One end of the sealing connecting pipe (5) is threaded to one end of the pipeline ball valve (4), and the backrest pipe body (1) can penetrate the interior of the sealing connecting pipe (5) and the pipeline ball valve (4). The backrest pipe body (1) can extend into the coal powder flow rate pipeline. The placement groove (9) is opened at the end of the sealing connecting pipe (5) away from the pipeline ball valve (4). The sealing ring (6) is embedded in the placement groove (9), and the shape of the sealing ring (6) is "conical at both ends and symmetrically extended inward and then connected". The backrest pipe body (1) can penetrate the interior of the sealing ring (6). The extrusion assembly includes a tightening ring (7) and an extrusion stud (8). The tightening ring (7) is located at one end of the sealing connecting pipe (5), and the outer wall of the tightening ring (7) is evenly provided with anti-slip texture. The extrusion stud (8) is fixed at one end of the tightening ring (7), and the extrusion stud (8) can be threaded onto the inner wall of the placement groove (9). One end of the extrusion stud (8) is in contact with the sealing ring (6), and the backing tube (1) can penetrate the interior of the extrusion stud (8) and the tightening ring (7).

2. A sealing device for a circular backrest tube according to claim 1, characterized in that: The backrest pipe (1) is sealed with a total pressure measuring tube (11) at the end away from the three-way connecting pipe (2), and the opening of the total pressure measuring tube (11) is directly opposite to the flow velocity direction of the pulverized coal flow pipeline. The backrest pipe (1) is sealed with a static pressure measuring tube (12) at the end away from the three-way connecting pipe (2), and the static pressure measuring tube (12) is located on one side of the total pressure measuring tube (11), and the opening of the static pressure measuring tube (12) is perpendicular to the flow velocity direction of the pulverized coal flow pipeline.

3. A sealing device for a circular backrest tube according to claim 2, characterized in that: A partition plate (10) is fixed in the center of the backrest tube (1), and the partition plate (10) can separate the air inlets of the total pressure measuring tube (11) and the static pressure measuring tube (12), and the total pressure measuring tube (11) and the static pressure measuring tube (12) can flow to the two output ports of the three-way connecting pipe (2) respectively.

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