A multi-point pressure detection device

Abstract

This invention provides a multi-point pressure detection device, belonging to the field of pipeline fluid pressure testing technology. The device includes: a first flange disposed at the end of a first pipeline, a second flange disposed at the end of a second pipeline, a sensor support, and a pressure sensor; at the internal connection position of the first flange and the second flange, a receiving space communicating with the interior of the first pipeline and the second pipeline is formed, the receiving space is used to house the sensor support, and the pressure sensor is disposed in a sensor mounting hole in the sensor support; this application realizes multi-point pressure detection on the same cross section in a complex fluid environment, and effectively solves the pipeline leakage problem that may be caused by multiple sensor mounting holes while ensuring measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of pipeline fluid pressure testing technology, and specifically to a multi-point pressure detection device. Background Technology

[0002] Pressure detection devices initially consisted of pointer-type pressure detection devices. Pointer-type pressure detection devices have disadvantages such as being susceptible to vibration; they must be kept vertical during measurement; parameters can only be viewed at eye level, resulting in parallax; readings can only be estimated, leading to large errors; they cannot be overloaded, otherwise permanent damage will occur; they have large zero-point variation; large temperature coefficient; poor reliability; and require frequent maintenance, with internal cleaning being difficult. These disadvantages make installation, use, and maintenance inconvenient for users.

[0003] Therefore, improvements were made to the aforementioned pointer-type pressure detection device, transforming it into a digital pressure detection device. This digital device includes: a main body comprising a housing and an internal main board; the housing connects to and protects the main board, while the main board handles signal processing and digital display; and a sensor comprising a housing and a diffused silicon connector; the housing protects the diffused silicon connector, which performs pressure measurement and signal transmission. Compared to pointer-type pressure detection devices, digital pressure detection devices offer advantages such as easier installation, vibration resistance, digital display, no parallax, a wide overload range, high sensitivity, high reliability, and near-maintenance-free operation, significantly enhancing user convenience in installation, use, and maintenance.

[0004] However, this technical solution still has shortcomings. It can only measure a single point on the same cross-section of the fluid, and it cannot accurately measure the complex fluid environment inside the pipeline. Furthermore, the sensor mounting holes are prone to pipeline leaks. Due to water hammer and other factors, fluids in ultra-high pressure pipelines experience complex turbulence. This turbulence causes pressure differences across the same cross-section of the pipeline, meaning that the single-point measurement method of digital pressure detection devices cannot comprehensively measure fluid pressure. To address this, we conducted experiments using existing digital pressure detection devices in ultra-high pressure pipelines. The results showed that pressure differences exist at various points on the same cross-section of the fluid. In the ultra-high pressure pipeline environment, these pressure differences cause varying degrees of wear on the pipeline walls, further reducing pipeline lifespan.

[0005] Because of the complex fluid environment in ultra-high pressure pipelines, ordinary digital pressure detection devices are obviously not suitable for single-point detection. Traditional pressure sensor installation requires pre-set mounting holes in the pipeline, and setting multiple mounting holes will multiply the risk of pipeline leakage. Therefore, it is of great significance to develop a technical solution that can adapt to multi-point pressure detection on the same cross section in complex fluid environments. Summary of the Invention

[0006] This invention relates to a multi-point pressure detection device, which can perform multi-point pressure detection on the same cross section in complex fluid environments, effectively solving the pipeline leakage problem that may be caused by multiple sensor mounting holes while ensuring measurement accuracy.

[0007] This invention is achieved using the following technical means:

[0008] A multi-point pressure detection device includes: a first flange disposed at the end of a first pipe, a second flange disposed at the end of a second pipe, and a sensor support; the first pipe and the second pipe, which need to be connected to each other, are connected by the first flange and the second flange disposed at their respective ends, respectively; bolts pass through a plurality of first through holes evenly distributed along the outer edges of the first flange and the second flange and are fastened with nuts to realize the connection between the first pipe and the second pipe; at the internal connection position of the first flange and the second flange, a receiving space communicating with the interior of the first pipe and the second pipe is formed, the receiving space is used to house the sensor support, the sensor support has the same shape as the receiving space, the receiving space is generally annular, the cross-section of the receiving space is an isosceles trapezoid, the side of the receiving space near the outer side of the first flange and the second flange is the longer side of the parallel side of the isosceles trapezoid, and the side of the receiving space near the inner side of the first flange and the second flange, which is flush with the inner wall of the pipe, is the shorter side of the parallel side of the isosceles trapezoid; in addition, in some other embodiments, the cross-sectional shape of the receiving space and the sensor support can also be rectangular or other shapes with appropriate modifications based on the isosceles trapezoid. The sensor support is an elastic seal that serves as a support for the pressure sensor and a sealing connection between adjacent pipes in the detection device. While a rectangular cross-section of the sensor support does not provide the same sealing performance as an isosceles trapezoidal cross-section, it saves significant costs in design and manufacturing. Therefore, it can be used as an alternative to the isosceles trapezoidal cross-section in low-pressure pipelines. Furthermore, a modified isosceles trapezoidal cross-section can further improve the sealing connection performance. The axial dimension of the sensor support can be slightly larger than the axial dimension of the accommodating space, using an interference fit to achieve a sealing connection between the first and second pipes. Simultaneously, it is crucial to ensure that the shorter side of the parallel side of the sensor support is approximately flush with the inner wall of the pipe after installation to avoid affecting fluid transmission within the pipeline.

[0009] Preferably, the first flange and the first pipe and / or the second flange and the second pipe can be integrally formed or can be detachably fixedly connected.

[0010] The sensor support is generally annular, with its inner diameter roughly the same as the pipe's inner diameter. The cross-section of the sensor support is an isosceles trapezoid. The sensor support has several sensor mounting holes evenly distributed along its inner side. These mounting holes are frustum-shaped, with the smaller circular end facing inwards. The sensor support also has several second through holes that communicate with each of the sensor mounting holes and connect to the outer wall of the sensor support. The mounting holes are used to mount and fix the pressure sensor. The pressure sensor's housing is also frustum-shaped and fits the mounting holes. The sensing surface of the pressure sensor faces and is roughly flush with the inner wall of the sensor support. The power supply and data transmission lines of the pressure sensor pass through the second through holes and connect to corresponding external devices. The first and second flanges also have wiring holes that connect to the second through holes.

[0011] Preferably, there are four sensor mounting holes 7 evenly distributed on the inner side of the sensor support.

[0012] To achieve multi-point pressure detection on the same cross-section in complex fluid environments and effectively solve the pipeline leakage problem that may be caused by multiple sensor mounting holes while ensuring measurement accuracy, this application inventively proposes to set a sensor support between the pipe connection flanges, thereby avoiding the need to open sensor mounting holes in the pipe and reducing the risk of pipeline leakage caused by sensor mounting holes. The trapezoidal cross-section of the sensor support can ensure good self-sealing of the first flange and the second flange during the connection and clamping of the sensor support. The housing of the pressure sensor is frustoconical and matches the sensor mounting hole set in the sensor support. The first flange and the second flange can also ensure a sealing fit between the pressure sensor and the sensor mounting hole during the connection and clamping of the sensor support.

[0013] The sensor support includes: an outer layer of nitrile rubber, a metal support layer, and an inner layer of fluororubber. The metal support layer is generally annular in shape, with a trapezoidal cross-section that is hollow inside and opens inward. The metal support layer provides sufficient support for the sensor support, and the material of the metal support layer is preferably stainless steel or aluminum alloy. The outer layer of nitrile rubber covers the outside of the metal support layer, and the inner layer of fluororubber is attached to the inside of the metal support layer. The inner layer of fluororubber extends towards the outer layer of nitrile rubber at the opening of the metal support layer, covering the lower end of the metal support layer. Several sensor mounting holes are evenly distributed on the inner side of the inner layer of fluororubber. The outer layer possesses excellent oil resistance, high wear resistance, good heat resistance, and strong adhesion. Furthermore, the outer layer of the sensor support should not undergo excessive deformation to avoid significant changes in the overall shape of the sensor support. Therefore, nitrile rubber is selected for the outer layer. The fluororubber inner layer has advantages such as high temperature resistance, oil resistance, and chemical corrosion resistance. Since the fluororubber inner layer mainly contacts the fluid in the pipeline, its corrosion resistance must be considered. Preferably, the fluororubber inner layer extends towards the nitrile rubber outer layer at the opening of the metal support layer, covering the lower ends of both the metal support layer and the nitrile rubber outer layer to prevent corrosion of the sensor support by the fluid in the pipeline. The second through holes on the sensor support, corresponding one-to-one with the sensor mounting holes, include: an inner layer hole formed in the fluororubber inner layer, a middle layer hole formed in the metal support layer, and an outer layer hole formed in the nitrile rubber outer layer. The diameter of the inner layer hole is the same as the diameter of the outer layer hole, and both are slightly smaller than the diameter of the middle layer hole. The fluororubber inner layer can also be equipped with wiring channels for the power supply lines and data transmission lines of the pressure sensor. With wiring channels, the sensor support part can be equipped with only one second through hole, through which the converged power supply lines and data transmission lines of the pressure sensor are connected to the outside world to supply power to the pressure sensor and to conduct data communication. This will be described in detail later.

[0014] The pressure sensor is a diffused silicon pressure sensor, comprising: a frustum-shaped housing, within which a cylindrical cavity is provided to house a diaphragm, an oil-filled chamber, a chip, a circuit board, and a battery. The configuration of the pressure sensor, except for the battery, is a common feature of conventional diffused silicon pressure sensors. The battery ensures that the pressure sensor can continue to operate for a period of time in the event of external power failure, preventing interruption of pressure monitoring. Existing diffused silicon pressure sensors also suffer from the technical problem of potential water hammer effects. To reduce the impact of water hammer on the pressure sensor, the fluid inlet, which is typically located in the center of the sensing surface, is positioned on one side of the small dome surface of the frustum-shaped pressure sensor, i.e., the fluid inlet. A fluid outlet is located on the opposite side of the small bottom surface of the frustum-shaped pressure sensor, opposite the fluid inlet. Depending on the direction of fluid flow, the fluid inlet can also serve as the fluid outlet, and vice versa. This configuration significantly reduces the impact of the fluid flow in the pipe on the sensor components when there are significant changes in the flow rate or velocity, while ensuring real-time and accurate measurement of the pressure value within the pipe. A conduit for power supply and data transmission lines is fixedly installed on the large dome surface of the pressure sensor. The outer diameter of the conduit is equal to the diameter of the middle layer hole, and slightly larger than the diameters of the inner and outer layer holes. This arrangement further ensures the sealing performance between the pressure sensor and the sensor support. A third through hole is also provided at the bottom of the conduit. The position of the third through hole corresponds to the wiring groove provided in the fluororubber inner layer. The power supply and data transmission lines of the remaining pressure sensor pass through the wiring groove, through the third through hole, and through the conduit to connect to the outside. This avoids the risk of leakage caused by setting multiple interfaces to the outside.

[0015] Another structure of the pressure sensor does not have a conduit. Taking a sensor support with four sensor mounting holes as an example, the sensor support only has a second through hole. The aforementioned pressure sensor is installed in the sensor mounting hole corresponding to the second through hole, while the other three sensor mounting holes are equipped with pressure sensors of another structure. The power supply lines and data transmission lines of the pressure sensors installed in the other three sensor mounting holes converge above the sensor mounting hole corresponding to the second through hole through the wiring groove, and then pass through the third through hole of the conduit of the pressure sensor at this position to connect with the outside.

[0016] The present invention has the following advantages

[0017] (1) It simultaneously achieves pipe connection sealing and multi-point pressure detection of the pipe, without the need for additional holes to be drilled on the pipe, effectively avoiding and solving the pipe leakage problem that may be caused by multiple sensor mounting holes, and realizing multi-point pressure detection on the same cross section in a complex fluid environment;

[0018] (2) The three-layer structure of the sensor support not only achieves sufficient structural strength of the sensor support, but also ensures its sealing performance, and also takes into account the corrosive effect of the fluid in the pipeline on the sensor support.

[0019] (3) In order to reduce the impact of water hammer effect in the pipeline on the pressure sensor, a fluid inlet is set on one side of the small dome surface of the pressure sensor frustum, and a fluid outlet is set on the other side of the small bottom surface of the pressure sensor frustum opposite to the fluid inlet. When the flow rate or velocity of the fluid in the pipeline changes significantly, the impact of the fluid in the pipeline on the sensor component of the pressure sensor will be significantly reduced.

[0020] (4) The sensor support has only one second through hole to avoid the risk of leakage caused by setting multiple interfaces for connection with the outside world. Attached Figure Description

[0021] Figure 1 The diagram shows the installation of a multi-point pressure detection device in a pipeline.

[0022] Figure 2 The diagram shown is a structural schematic of the sensor support section;

[0023] Figure 3 As shown Figure 2 A partial enlarged cross-sectional view of the sensor support section AA;

[0024] Figure 4 The diagram shown is a structural schematic of a pressure sensor.

[0025] Figure 5 The diagram shows another structural schematic of a pressure sensor. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, and not all of them.

[0027] Figure 1The diagram shows the installation of a multi-point pressure detection device in a pipeline. The multi-point pressure detection device includes: a first flange 3 at one end of a first pipe 1, a second flange 4 at one end of a second pipe 2, a sensor support 6, and a pressure sensor 9. The first pipe 1 and the second pipe 2, which need to be connected to each other, are connected through the first flange 3 and the second flange 4 at their respective ends. Bolts pass through a plurality of first through holes 5 evenly distributed along the outer edges of the first flange 3 and the second flange 4 and are tightened with nuts to achieve the connection between the first pipe 1 and the second pipe 2. At the internal connection position of the first flange 3 and the second flange 4, a connection is formed between the first pipe 1 and the second flange 4. The two pipes 2 are connected to a accommodating space 10, which is used to house the sensor support 6. The sensor support 6 has the same shape as the accommodating space 10. The accommodating space 10 is generally annular, and its cross-section is an isosceles trapezoid. The side of the accommodating space 10 closest to the outside of the first flange 3 and the second flange 4 is the longer side of the parallel side of the isosceles trapezoid, and the side closest to the inside of the first flange 3 and the second flange 4, which is flush with the inner wall of the pipe, is the shorter side of the parallel side of the isosceles trapezoid. In addition, in some other embodiments, the cross-sectional shapes of the accommodating space 10 and the sensor support 6 can also be selected as rectangular or other shapes that are appropriately modified based on the isosceles trapezoid. The sensor support 6 is an elastic seal that serves as a support for the pressure sensor and a sealing connection for adjacent pipes in the detection device. While the rectangular cross-section of the sensor support 6 does not provide as good sealing performance as the isosceles trapezoidal cross-section, it saves a lot of costs in design and manufacturing. Therefore, it can be used as an alternative to the isosceles trapezoidal cross-section in low-pressure pipelines. Furthermore, the irregular shape obtained by making appropriate improvements to the isosceles trapezoidal cross-section is expected to further improve the sealing connection performance of the pipeline. The dimension of the sensor support 6 in the axial direction of the pipeline can be slightly larger than that of the accommodating space 10 in the axial direction of the pipeline, with an interference fit to achieve a sealing connection between the first pipeline 1 and the second pipeline 2. At the same time, it is necessary to ensure that the shorter side of the parallel side of the sensor support 6 is basically flush with the inner wall of the pipeline after installation to avoid affecting the transmission of fluid in the pipeline.

[0028] Preferably, the first flange 3 and the first pipe 1 and / or the second flange 4 and the second pipe 2 can be integrally formed or can be detachably fixedly connected.

[0029] Figure 2 The diagram shows the structure of the sensor support 6. The sensor support 6 is generally annular, and the inner diameter of the annulus is basically the same as the inner diameter of the pipe. As can be seen from its AA section, the cross-section of the sensor support 6 is an isosceles trapezoid. Figure 2As shown in the attached diagram on the right, the sensor support 6 has several sensor mounting holes 7 evenly distributed on the inner side of the sensor support 6. Each sensor mounting hole 7 is frustum-shaped, with the smaller circular end face of the frustum facing the inner side of the sensor support 6. The sensor support 6 also has several second through holes 8 that correspond one-to-one with the sensor mounting holes 7 and communicate with the outer wall of the sensor support 6. The sensor mounting holes 7 are used to mount and fix the pressure sensor 9. The housing of the pressure sensor 9 is also frustum-shaped and adapted to the sensor mounting holes 7. The sensing surface of the pressure sensor 9 faces the inner wall of the sensor support 6 and is basically flush with it. The power supply line and data transmission line of the pressure sensor 9 pass through the second through holes 8 and are connected to corresponding external devices. Figure 1 As can be seen from the upper part, the first flange 3 and the second flange 4 are also provided with wiring holes that communicate with the second through hole 8.

[0030] Preferably, there are four sensor mounting holes 7 evenly distributed inside the sensor support 6.

[0031] Combination Figure 1 and Figure 2 As can be seen, in order to achieve multi-point pressure detection on the same cross section in complex fluid environments and effectively solve the pipeline leakage problem that may be caused by multiple sensor mounting holes while ensuring measurement accuracy, the inventive body of this application proposes to set a sensor support part 6 between the pipeline connecting flanges, thereby avoiding the opening of sensor mounting holes on the pipeline and reducing the pipeline leakage risk caused by sensor mounting holes; the trapezoidal cross section of the sensor support part 6 can ensure that the first flange 3 and the second flange 4 achieve good self-sealing during the connection and clamping of the sensor support part 6. The housing of the pressure sensor 9 is frustoconical and matches the sensor mounting hole 7 set in the sensor support part 6. The first flange 3 and the second flange 4 can also ensure the sealing fit between the pressure sensor 9 and the sensor mounting hole 7 during the connection and clamping of the sensor support part 6.

[0032] Figure 3 As shown Figure 2An enlarged cross-sectional view (AA) of the sensor support portion 6 shows that the sensor support portion 6 includes: an outer nitrile rubber layer 63, a metal support layer 61, and an inner fluororubber layer 62. The metal support layer 61 is generally annular in shape, with a trapezoidal cross-section that is hollow inside and has an inward opening. The metal support layer 61 provides sufficient support for the sensor support portion 6, and the material of the metal support layer 61 is preferably stainless steel or aluminum alloy. The outer nitrile rubber layer 63 covers the outside of the metal support layer 61, and the inner fluororubber layer 62 is attached to the inside of the metal support layer 61. The inner fluororubber layer 62 extends towards the outer nitrile rubber layer 63 at the opening of the metal support layer 61, covering the lower end of the metal support layer 61. Several sensor mounting holes 7 are evenly distributed. The inner side of the fluororubber inner layer 62; the nitrile rubber outer layer 63 has the advantages of good oil resistance, high wear resistance, good heat resistance and strong adhesion, and the outer layer of the sensor support part 6 should not undergo excessive deformation so as to cause excessive changes in the overall shape of the sensor support part 6. Therefore, nitrile rubber is selected for the nitrile rubber outer layer 63; the fluororubber inner layer 62 has the advantages of high temperature resistance, oil resistance and chemical corrosion resistance. Since the fluororubber inner layer 62 is mainly in contact with the fluid in the pipeline, its corrosion resistance performance must be considered; preferably, the fluororubber inner layer 62 extends towards the nitrile rubber outer layer 63 at the opening of the metal support layer 61 to cover the lower end of the metal support layer 61 and the nitrile rubber outer layer 63, so as to avoid the fluid in the pipeline from corroding the sensor support part 6. The second through holes 8 on the sensor support 6, corresponding one-to-one with the sensor mounting holes 7, include: an inner layer hole 82 formed in the fluororubber inner layer 62, a middle layer hole 81 formed in the metal support layer 61, and an outer layer hole 83 formed in the nitrile rubber outer layer 63; wherein, the diameter of the inner layer hole 82 is the same as the diameter of the outer layer hole 83, and both are slightly smaller than the diameter of the middle layer hole 81. The fluororubber inner layer 62 can also be provided with a wiring groove 621, which is used for the power supply line and data transmission line of the pressure sensor 9. With the wiring groove 621, the sensor support 6 can be provided with only one second through hole 8, which connects the converged power supply line and data transmission line of the pressure sensor 9 to the outside world, providing power to the pressure sensor and enabling data communication, which will be described in detail later.

[0033] Figure 4The diagram shows the structure of pressure sensor 9, which is a diffused silicon pressure sensor. It includes a frustum-shaped housing 91, with a cylindrical cavity inside the housing 91 for accommodating a diaphragm 92, an oil-filled chamber 93, a chip 94, a circuit board 95, and a battery 96. The configuration of the pressure sensor 9, except for the battery 96, is a common feature of conventional diffused silicon pressure sensors. The battery 96 can ensure that the pressure sensor 9 can continue to work for a period of time in the event of an external power failure, thus avoiding interruption of pressure monitoring. Existing diffused silicon pressure sensors still have the technical problem of being susceptible to water hammer effects. In order to reduce the impact of water hammer on the pressure sensor, the pressure sensor 9 of this application places the fluid inlet, which is usually located in the center of the sensing surface, on one side of the small dome surface of the truncated cone of the pressure sensor 9, namely the fluid inlet 911. On the other side of the small bottom surface of the truncated cone of the pressure sensor 9 opposite to the fluid inlet 911, the fluid outlet 912 is set. Depending on the direction of fluid flow, the fluid inlet 911 can also be used as the fluid outlet, and the fluid outlet 912 can be used as the fluid inlet. With this arrangement, when there are significant changes in the flow rate or velocity of the fluid in the pipe, the impact of the fluid in the pipe on the sensor component of the pressure sensor 9 will be significantly reduced, and the pressure value in the pipe can be obtained in real time and accurately. A conduit 97 for power supply and data transmission lines is fixedly installed on the large dome surface of the pressure sensor 9. The outer diameter of the conduit 97 is equal to the diameter of the middle layer hole 81, and slightly larger than the diameters of the inner layer hole 82 and the outer layer hole 83. This arrangement can further ensure the sealing performance between the pressure sensor 9 and the sensor support 6. A third through hole 971 is also provided at the bottom of the conduit 97. The position of the third through hole 971 corresponds to the wiring groove 621 provided in the fluororubber inner layer 62. The power supply and data transmission lines of the remaining pressure sensor pass through the wiring groove 621, through the third through hole 971, and through the conduit 97 to connect to the outside. This can avoid the risk of leakage caused by setting multiple interfaces to connect to the outside.

[0034] Figure 5 The diagram shows another structural schematic of the pressure sensor, which is similar to... Figure 4 The difference lies in the absence of a wiring conduit 97. Taking the sensor support part 6 with four sensor mounting holes 7 as an example, the sensor support part 6 only has one second through hole 8, and a sensor mounting hole 7 corresponding to the second through hole 8 is installed inside. Figure 4 The pressure sensor 9 is shown, while the other three sensor mounting holes 7 are fitted with sensors such as... Figure 5 The power supply lines and data transmission lines of the pressure sensor 9 shown in the figure are connected to the sensor mounting hole 7 above the second through hole 8 via the wiring groove 621, and then pass through the third through hole 971 of the wiring tube 97 of the pressure sensor 9 at this position to connect with the outside.

[0035] The technical solutions of the above embodiments simultaneously achieve pipeline connection sealing and multi-point pressure detection of the pipeline, without the need for additional holes in the pipeline, effectively avoiding and solving the pipeline leakage problem that may be caused by multiple sensor mounting holes, and realizing multi-point pressure detection on the same cross section in complex fluid environments.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still improve the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-point pressure detection device, characterized by, The utility model relates to a kind of pressure sensor and pipeline connection structure, including: First flange is arranged at the first pipeline end, second flange is arranged at the second pipeline end, sensor support part, pressure sensor;Bolt passes through several first through holes along the first flange and the second flange outer edge circumferentially uniform distribution and nut fastening cooperation realizes the connection of first pipeline and second pipeline, at the internal connection position of the first flange and the second flange, accommodate space is formed with the internal communication of first pipeline and second pipeline, accommodate space is used to set sensor support part, sensor support part is consistent with the shape of accommodate space, accommodate space is overall annular, the cross section of accommodate space is isosceles trapezoidal, the side of accommodate space close to the outer side of the first flange and the second flange is long side in isosceles trapezoidal parallel side, the side close to the inner side of the first flange and the second flange and pipeline inner wall flush is short side in isosceles trapezoidal parallel side;Sensor support part has several sensors installation holes evenly distributed in the inner side of sensor support part, sensor installation hole is circular truncated cone, the small circular end face of circular truncated cone is directed to the inner side of sensor support part;Sensor installation hole is used to install fixed pressure sensor, the shell of pressure sensor is also circular truncated cone and is adapted to sensor installation hole.

2. The multipoint pressure sensing device of claim 1, wherein, Sensor support part includes: nitrile rubber outer layer, metal support layer and fluorine rubber inner layer;Metal support layer is overall annular shape, and its cross section is trapezoidal shape with internal hollow, opening inward;Nitrile rubber outer layer is covered on the outer side of metal support layer, fluorine rubber inner layer is attached to the inner side of metal support layer, and fluorine rubber inner layer extends to the side of nitrile rubber outer layer at the opening position of metal support layer to cover the lower end of metal support layer and nitrile rubber outer layer.

3. The multipoint pressure sensing device of claim 2, wherein, The material of metal support layer is stainless steel or aluminum alloy.

4. The multipoint pressure sensing device of claim 1, wherein, The pressure sensor is a diffusion silicon pressure sensor, which includes a circular truncated cone-shaped shell, a cylindrical cavity is arranged in the circular truncated cone-shaped shell for accommodating a diaphragm, an oil-filled cavity, a chip, a circuit board and a battery, and the battery ensures that the pressure sensor can continue to work in the case of external power failure.

5. The multipoint pressure sensing device of claim 4, wherein, A fluid inlet is arranged on one side of the small circular top surface of the circular truncated cone-shaped shell of the pressure sensor, and a fluid outlet is arranged on the other side of the small circular top surface of the circular truncated cone-shaped shell of the pressure sensor opposite the fluid inlet.

6. The multipoint pressure sensing device of claim 1, wherein, A plurality of second through holes corresponding to the sensor installation holes are further arranged on the sensor support part, the second through holes are in communication with the outer wall of the sensor support part, and the power supply line and data transmission line of the pressure sensor are connected to the corresponding external devices through the second through holes; the first flange and the second flange further have wiring holes in communication with the second through holes.

7. The multi-point pressure sensing device of claim 2, wherein, The fluorine rubber inner layer extends to the side of the nitrile rubber outer layer at the opening position of the metal support layer to cover the lower end of the metal support layer and the nitrile rubber outer layer, thereby avoiding corrosion of the sensor support part by the fluid in the pipeline.

8. The multipoint pressure sensing device of claim 2, wherein, The fluorine rubber inner layer can further have a wiring groove for the power supply line and data transmission line of the pressure sensor.

9. The multipoint pressure sensing device of claim 6, wherein, The second through holes corresponding to the sensor installation holes on the sensor support part include inner layer holes formed in the fluorine rubber inner layer, middle layer holes formed in the metal support layer, and outer layer holes formed in the nitrile rubber outer layer; the diameter of the inner layer hole is the same as that of the outer layer hole, and both are slightly smaller than the diameter of the middle layer hole.

10. The multipoint pressure sensing device of claim 9, wherein, The large circular top surface of the pressure sensor is fixedly provided with a wiring tube through which the power supply line and the data transmission line pass, and the outer diameter of the wiring tube is equal to the diameter of the middle layer hole and slightly larger than the diameters of the inner layer hole and the outer layer hole.

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