A fluid-entrapment-resistant conduit pressure sensor structure
By protruding the diaphragm and pressure sensor head into the pipe in the sensor structure, the problem of fluid stagnation in the dead zone of traditional pressure sensors is solved, achieving higher measurement accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIAXING RES INST ZHEJIANG UNIV
- Filing Date
- 2023-12-20
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional pressure sensors are prone to dead zones during fluid flow, which can cause fluid stagnation and affect measurement accuracy.
Design a pipeline pressure sensor structure to prevent fluid stagnation, wherein the diaphragm and pressure sensor head protrude into the pipeline to avoid the formation of dead zones, and the fluid pressure inside the pipeline is received by the thin diaphragm and transmitted to the pressure-sensitive area.
It effectively prevents fluid retention, improves measurement accuracy, and ensures the accuracy and reliability of the pressure sensor.
Smart Images
Figure CN117928816B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure sensors for detecting fluids, specifically a pipeline pressure sensor structure that prevents fluid stagnation. Background Technology
[0002] Pipeline pressure sensors detect the pressure of gas or liquid inside a pipeline to detect leaks.
[0003] Traditional pressure sensors use a conduit to transfer flowing gas or liquid from one end to the other. A small space (dead zone) is formed above a certain portion of the conduit. A thin diaphragm, designed to receive pressure, is placed above this dead zone. The sensor head is positioned above the diaphragm, with its pressure-sensitive area in contact with the diaphragm. The sensor head is fixed inside the conduit via the diaphragm and the dead zone. In this structure, the flowing gas or liquid enters the dead zone, transmitting the pressure inside the conduit through the diaphragm to the pressure-sensitive area of the sensor. This allows for the detection of pressure changes within the conduit, thus determining whether a leak exists.
[0004] When gas or liquid flows through a pipe, the fluid may be trapped inside a dead zone, affecting the measurement accuracy. Therefore, the purpose of this invention is to provide a pressure sensor in which a dead zone is not formed under the diaphragm, so that gas or liquid does not remain inside the sensor's measurement area. Summary of the Invention
[0005] The present invention aims to solve the above-mentioned problems. To this end, the present invention proposes a pipeline pressure sensor structure that prevents fluid retention. By protruding the diaphragm and pressure sensor head into the pipeline, a dead zone is not formed below the diaphragm, thereby preventing gas or liquid from remaining in the sensor's measurement area.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A pipeline pressure sensor structure for preventing fluid retention includes a main body, a top cover, a base, a housing, a pressure sensor head, a sensor bracket, and a cable;
[0008] The main body has a fluid channel at its center, and a sensor head mounting hole is provided on the inner wall of the fluid channel. A fixing bracket with a thin diaphragm at the bottom is installed in the sensor head mounting hole. The bottom of the fixing bracket is a boss structure with an inclined surface, which protrudes into the fluid channel. The pressure sensor head is fixed by the fixing bracket, and the pressure-sensitive surface of the pressure sensor head contacts the thin diaphragm. The sensor bracket is sleeved on the outer wall of the pressure sensor head and located above the fixing bracket. The outer shell is sleeved on the outside of the pressure sensor head to form a protective shell. One end of the cable is connected to the pressure sensor head, and the other end extends out of the outer shell.
[0009] The top cover and the base are respectively installed on the top and bottom of the main body, and the top cover is provided with a limiting block for fixing the sensor bracket.
[0010] Preferably, the sensor head mounting hole is a stepped hole structure, and the fixing bracket matches the stepped hole structure.
[0011] Preferably, a sealing ring is provided between the fixed bracket and the stepped hole.
[0012] Preferably, the fixed bracket is provided with a first exhaust channel, one end of which is located on the inner wall of the fixed bracket near the bottom, and the other end of which is located on the top of the fixed bracket.
[0013] Preferably, the upper cover has a second exhaust channel inside, one end of which is connected to the other end of the first exhaust channel, and the other end of which is connected to the outside.
[0014] Preferably, the top cover, base, and main body are connected by fixing bolts.
[0015] Preferably, one or both ends of the fluid channel are provided with an internal thread structure for connecting an external conduit.
[0016] Preferably, the inner layer of the outer shell is provided with a shielding shell.
[0017] Preferably, the top of the housing is provided with a cap and a cable sheath, through which the cable extends out of the housing.
[0018] Preferably, the main body and the thin diaphragm are made of corrosion-resistant materials.
[0019] The beneficial effects of this invention are as follows: In the pipeline pressure sensor structure provided by this invention, the pressure-sensitive area in the pressure sensor head contacts the thin diaphragm, is installed by a fixed bracket and protrudes into the pipeline. The thin diaphragm can directly receive the pressure of the fluid in the pipeline and apply the pressure to the pressure-sensitive area in the pressure sensor head, thereby completing the internal pressure measurement of the pipeline. At the same time, since the measuring part protrudes into the pipeline, it can prevent the fluid from stagnating in the sensor measuring area, thereby improving the measurement accuracy. Attached Figure Description
[0020] Figure 1 Front cross-sectional view of a pipeline pressure sensor structure designed to prevent fluid stagnation;
[0021] Figure 2 Side view of a pipeline pressure sensor structure designed to prevent fluid stagnation;
[0022] Figure 3 Diagram of the fixed support;
[0023] Figure 4 This is a sectional view of the fixed support.
[0024] In the diagram: 1-Main body, 2-Conduit, 3-Top cover, 4-Base, 5-Thin diaphragm, 6-First fixing bolt, 7-Pressure sensor head, 8-Fixing bracket, 9-Sensor bracket, 10-Second fixing bolt, 11-Cable bracket, 12-Shielding shell, 13-Outer shell, 14-Cable, 15-Cap, 16-Cable sheath, 17-Sealing ring, 18-Exhaust channel. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0026] See Figure 1 and Figure 2 The pipeline pressure sensor structure for preventing fluid stagnation provided by the present invention includes a main body 1, a top cover 3, a base 4, a thin diaphragm 5, a first fixing bolt 6, a pressure sensor head 7, a fixing bracket 8, a sensor bracket 9, a second fixing bolt 10, a cable bracket 11, a shielding shell 12, an outer shell 13, a cable 14, a cap 15, a cable sheath 16, a sealing ring 17, and an exhaust channel 18.
[0027] The entire structure's fluid channel is located inside the main body 1, which is connected to the external conduit 2 via a threaded structure. The fluid to be tested flows from one end of the fluid channel to the other through the conduit. If the fluid is a corrosion-resistant chemical, the main body 1 and the conduit 2 can be made of corrosion-resistant materials.
[0028] A sensor head mounting hole is provided on the inner wall of the fluid channel. A fixing bracket 8 is installed in the sensor head mounting hole. The bottom of the fixing bracket 8 is a boss structure with an inclined surface, protruding into the fluid channel. The sensor head mounting hole is a stepped hole structure, and the fixing bracket 8 matches the stepped hole structure. The pressure sensor head 7 is limited by the fixing bracket 8. A thin diaphragm 5 is covered on the bottom of the fixing bracket 8. The thin diaphragm is in contact with the pressure-sensitive surface of the pressure sensor head 7. In this embodiment, the thin diaphragm 5 is made of a corrosion-resistant material to ensure that the pressure sensor head 7 does not directly contact the liquid in the pipe, but receives the pressure from inside the pipe and transmits it to the pressure-sensitive surface of the pressure sensor head 7 above, so as to avoid corrosion affecting the measurement accuracy. At the same time, a first exhaust channel is provided in the fixing bracket 8. One end of the first exhaust channel is located on the inner wall of the fixing bracket 8 near the bottom, and the other end is located on the top of the fixing bracket 8. It can be seen that the first exhaust channel is located between the thin diaphragm 5 and the pressure sensor head 7, so that the gas near the pressure sensor head 7 can be discharged along the first exhaust channel, thereby further improving the measurement accuracy.
[0029] The aforementioned thin diaphragm 5, pressure sensor head 7, and fixed bracket 8 constitute the system pressure measurement part, and protrude into the inside of the pipe to prevent the formation of dead zones, which would cause fluid to stagnate inside the dead zones and affect measurement accuracy.
[0030] The pressure sensor head 7 is provided with a sensor bracket 9 on its upper part, which fixes the pressure sensor head 7 to the main body 1. The sensor bracket 9 is pressed and fixed by the upper cover 3. The upper cover 3, the main body 1, and the base 4 are installed as a whole by the first fixing bolt 6. A sealing ring 17 is provided between the fixing bracket 8 and the main body 1 to prevent fluid inside the pipeline from seeping into the pressure sensor. In this embodiment, the sensor bracket 9 is sleeved on the outer wall of the pressure sensor head 7 and is located above the fixing bracket 8; the upper cover 3 is provided with a limiting block for fixing the sensor bracket 9, and the upper cover 3 has a second exhaust channel inside. One end of the second exhaust channel is connected to the other end of the first exhaust channel, and the other end of the second exhaust channel is connected to the outside. The first exhaust channel and the second exhaust channel together form Figure 1 The complete exhaust passage 18 in the middle.
[0031] In one specific embodiment of the present invention, the pressure sensor head 7 is provided with a shielding shell 12 and an outer shell 13, the shielding shell being located inside the outer shell, and both being fixed to the upper cover 3; the top of the outer shell is provided with a cap 15. The cable 14 is fixed to the cable bracket 11 by a second fixing bolt 10, one end of the cable is connected to the pressure sensor head 7, and the other end extends out of the outer shell. A cable sheath 16 is installed on the top of the outer shell to protect the cable 14.
[0032] See Figure 3 and Figure 4 The inner wall of the fixed bracket 8, where the pressure sensor head 7 is connected, has an internal thread structure, and its top has a venting channel communicating with the inner wall. The bottom of the fixed bracket 8 is a boss structure with an inclined surface, protruding into the pipe. The pressure sensor head 7 is installed inside the fixed bracket 8, thereby realizing the measurement of the fluid pressure inside the pipe. A thin diaphragm 5 is placed between the pressure sensor head 7 and the fluid being measured. This thin diaphragm covers the pressure sensor head 7 and is corrosion-resistant. The thin diaphragm is in direct contact with the fluid inside the pipe, and the fluid pressure is transmitted to the pressure-sensitive area of the pressure sensor head 7 through the thin diaphragm, realizing the measurement of the pressure inside the pipe. A vent hole 18 is provided between the thin diaphragm 5 and the pressure sensor head 7, allowing gas near the pressure sensor head 7 to be discharged to the outside of the equipment, thereby further improving the measurement accuracy.
[0033] In the embodiments of the present invention, those skilled in the art will understand that the above are merely preferred examples of the present invention and are not intended to limit the present invention to other forms. Although the present invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical content described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the technical essence of the present invention and the above embodiments should be included within the protection scope of the present invention.
Claims
1. A pipeline pressure sensor structure for preventing fluid stagnation, characterized in that, Includes main body (1), top cover (3), base (4), thin diaphragm (5), pressure sensor head (7), fixed bracket (8), sensor bracket (9), housing (13) and cable (14); The main body (1) has a fluid channel at its center, and a sensor head mounting hole is provided on the inner wall of the fluid channel. A fixed bracket (8) with a thin diaphragm (5) at the bottom is installed in the sensor head mounting hole. The bottom of the fixed bracket (8) is a boss structure with an inclined surface, and the boss structure protrudes into the fluid channel. The pressure sensor head (7) is fixed by the fixed bracket (8), and the pressure-sensitive surface of the pressure sensor head (7) contacts the thin diaphragm (5). The sensor bracket (9) is sleeved on the outer wall of the pressure sensor head (7) and located above the fixed bracket (8). The outer shell (13) is sleeved on the outside of the pressure sensor head (7) to form a protective shell. One end of the cable (14) is connected to the pressure sensor head (7), and the other end extends out of the outer shell (13). The top cover (3) and the base (4) are respectively installed on the top and bottom of the main body (1), and the top cover (3) is provided with a limiting block for fixing the sensor bracket (9); The fixed bracket (8) is provided with a first exhaust channel. One end of the first exhaust channel is located on the inner wall of the fixed bracket (8) near the bottom, and the other end of the first exhaust channel is located on the top of the fixed bracket (8). The upper cover (3) is provided with a second exhaust channel. One end of the second exhaust channel is connected to the other end of the first exhaust channel, and the other end of the second exhaust channel is connected to the outside.
2. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, The sensor head mounting hole is a stepped hole structure, and the fixing bracket (8) matches the stepped hole structure.
3. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1 or 2, characterized in that, A sealing ring (17) is provided between the fixed bracket (8) and the stepped hole.
4. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, The top cover (3), base (4) and main body (1) are connected by fixing bolts.
5. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, One or both ends of the fluid channel are provided with an internal thread structure for connecting an external conduit.
6. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, The inner layer of the outer shell (13) is provided with a shielding shell (12).
7. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, The top of the housing is provided with a cap (15) and a cable sheath (16), through which the cable (14) extends out of the housing (13).
8. The pipeline pressure sensor structure for preventing fluid stagnation according to claim 1, characterized in that, The main body (1) and the thin diaphragm (5) are made of corrosion-resistant materials.