Pressure measuring system

Abstract

The utility model discloses a pressure measuring system, which comprises a measured pipe and a sensing part, and further comprises a buffer channel extending from the inner surface of an enclosure bulkhead to the outer surface of the enclosure bulkhead, the sensing part is at least partially located in the buffer channel and is in fluid sealing with the inner wall of the buffer channel, the buffer channel at least comprises a measuring section, and the measuring section is communicated with the inner cavity; the sensing part is a deformation piece and comprises a sensing position facing the inner cavity, the sensing position is exposed in the measuring section to sense fluid pressure from the inner cavity, and the change of the fluid state in the buffer channel is stable relative to the change in the flow channel, so that the situation that the sensing position is directly fluctuated when fluid flows, and then the stability and accuracy of a measuring result are reduced is avoided; accurate induction and measurement of the fluid state are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, especially a pressure measurement system. BACKGROUND

[0002] At present, along with the improvement of the self -control requirement of various industrial production environment, signal sensing device is widely applied, especially in fluid field in order to monitor or obtain the state in the fluid flow process, pressure sensor is often used to sense fluid pressure signal conversion into signal parameter to obtain the state of fluid.

[0003] The prior art such as the pressure sensing device disclosed in US4576181A includes a shell, a pressure transducer (i.e. a piezoresistive diaphragm), a transmission cable, a substrate, a coupling tube and a gel; wherein the pressure transducer (i.e. the piezoresistive diaphragm) and the transmission cable are arranged on the substrate in the shell, the wall of the shell is also provided with a channel extending from the coupling tube into the shell, and the substrate is provided with a hole in communication with the channel, so that the pressure transducer (i.e. the piezoresistive diaphragm) is exposed in the channel through the hole; the gel is filled in the channel and the hole to transmit the sensed fluid pressure to the pressure transducer (i.e. the piezoresistive diaphragm), and the pressure transducer measures the fluid pressure and transmits the electrical signal representing the pressure pulse along the cable to the monitor to realize the measurement of the fluid pressure.

[0004] However, since the gel protrudes from the port of the channel into the coupling tube and contacts the fluid in the coupling tube, and the gel can deform to sense the fluid pressure, but the deformability of the gel causes it to be easily disturbed by the flowing fluid when it directly contacts the fluid, reducing the accuracy of the measurement results; at the same time, the surface of the gel may be damaged after being washed by the fluid for a long time. UTILITY MODEL CONTENT

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a pressure testing system to solve the problem that the measurement results of the existing pressure measurement system are easily disturbed by the flowing fluid.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A pressure measurement system, comprising a measured tube and a sensing part, the measured tube comprising an inner cavity for receiving fluid to trigger the change of the sensing part, a surrounding wall surrounding the inner cavity, and ports located at the axial ends of the inner cavity, the surrounding wall comprising an inner surface contacting the inner cavity and an outer surface opposite to the inner surface;

[0008] It also includes a buffer channel and a shell, wherein the shell is set independently of the outer surface of the enclosure wall, the buffer channel extends from the inner surface of the enclosure wall toward the outer surface of the enclosure wall and passes through the enclosure wall and the shell wall in sequence, and the buffer channel is in communication with the inner cavity;

[0009] The buffer channel includes at least a measuring section extending along the inner surface of the enclosure towards the outer surface of the enclosure. The measuring section includes an initial section and an extension section, wherein the initial section is disposed on the enclosure and communicates with the inner cavity, and the extension section is disposed on the housing and communicates with the initial section. The sensing element is fluid-sealed with the buffer channel.

[0010] The sensing element is a deformable component, including a sensing position facing the inner cavity, the sensing position being exposed within the measuring section to sense the pressure of fluid from within the inner cavity.

[0011] This utility model's pressure measurement system determines the fluid state by detecting the pressure of the fluid flowing inside the test tube. Specifically, as the fluid in the inner cavity of the test tube flows axially along the tube, the buffer channel, connected to the inner cavity, also fills the buffer channel. The fluid properties within the buffer channel stabilize as the length of the buffer channel increases (i.e., fluid fluctuations decrease), allowing it to contact the sensing element (which can be located inside or outside the buffer channel). This allows the sensing element to detect the fluid pressure from within the inner cavity. In other words, the sensing element senses the fluid pressure and deforms to generate a pressure signal through the outer surface of the test tube. The surface features a shell independent of the test tube, and a buffer channel extends through the space between the enclosure wall and the shell wall, thereby increasing the length of the buffer channel. This allows the measuring section of the buffer channel to have an additional extension at the end furthest from the inner cavity, further extending the distance between the sensing position inside and the inner end of the buffer channel (where the inner end of the buffer channel is the opening of the buffer channel on the inner surface of the enclosure wall). In other words, the fluid pressure inside the cavity needs to pass through the highly stable fluid within the measuring section of the buffer channel before being transmitted to the sensing position. This helps reduce the deformation of the sensing position caused by dynamic fluctuations in the fluid inside the cavity, thus improving the stability and accuracy of the measurement results. Furthermore, the shell is independently located on the outer surface of the enclosure wall, ensuring the overall independence of the enclosure wall and preventing damage during manufacturing.

[0012] Preferably, the sensing element extends at least partially into the extension section of the buffer channel; extending the sensing element into the extension section helps to ensure the distance between the sensing element and the fluid in the inner cavity, and also ensures that the sensing element is kept in the buffer channel to reduce external interference or damage.

[0013] Preferably, the buffer channel extends perpendicularly to the axis of the test tube; this allows the sensing positions within the buffer channel to uniformly bear the pressure from the fluid, thereby improving the accuracy and stability of the measurement; simultaneously, the orientation of the sensing positions is perpendicular to the fluid flow direction in the test tube, which can reduce the impact of fluid flow on the diaphragm and reduce dynamic pressure fluctuations caused by changes in flow rate; this helps to provide more stable pressure readings.

[0014] Preferably, the sensing position includes a sensing center and a sensing periphery. In its natural state, the sensing center tends to be recessed away from the inner cavity relative to the sensing periphery; this can promote the complete accumulation of fluid in the sensing position, so that the fluid pressure acts on the sensing position more evenly and improves the detection accuracy.

[0015] Preferably, the end of the sensing part near the inner cavity extends in a conical shape towards the end away from the inner cavity; the conical shape of the sensing part makes the upper area of ​​the sensing part small enough to be assembled into the buffer channel, while the lower area of ​​the sensing part is increased, which can ensure that the entire pressure sensing area of ​​the detection element (such as a sensor chip) can receive the pressure signal, thereby improving the stability and accuracy of the measurement.

[0016] Preferably, the sensing element is a gel or an elastic diaphragm. The gel or elastic diaphragm deforms upon sensing the pressure of the fluid, causing a change in its internal electric field distribution, thereby determining the applied pressure. This method is suitable for dynamic pressure measurement, exhibits high sensitivity, temperature resistance, and chemical stability, and has a simple manufacturing process, making it suitable for mass production.

[0017] Preferably, the pressure measurement system further includes a seal surrounding the outer periphery of the sensing position and fluid-sealing the inner wall of the buffer channel; the sensing position is recessed relative to the seal in a direction away from the inner cavity.

[0018] The function of the seal is to seal the sensing part to prevent fluid leakage between the sensing part and the inner wall of the buffer channel. At the same time, the sensing position is recessed relative to the seal, which also causes the fluid to accumulate completely in the sensing position, so that the fluid pressure is applied to the sensing position more evenly and the detection accuracy is improved.

[0019] Preferably, the pressure measurement system further includes a mounting portion; a portion of the mounting portion extending into the extension of the buffer channel forms the seal, the sensing portion is located within the mounting portion, the mounting portion has an exposure port, and the sensing portion is exposed to the measuring section through the exposure port.

[0020] The seal is part of the mounting section, eliminating the need for a separate seal in the buffer channel, thus reducing the difficulty of installing a seal in the buffer channel. The structure is simple and easy to manufacture. The mounting section extends into the extension of the buffer channel, which helps to ensure the distance between the sensing element and the fluid in the inner cavity, and also helps to support and protect the sensing element. The pressure of the fluid passes through the buffer channel and contacts the sensing position of the sensing element, ensuring that the sensing element does not move as a whole while deforming accurately, thus improving the detection accuracy.

[0021] Preferably, the pressure measurement system further includes a sensor chip and a substrate. The sensor chip is fixed inside the housing by the substrate, and one end of the sensing part connected to the substrate covers the sensor chip, so that the sensing part and the sensor chip are correspondingly arranged.

[0022] The sensor chip is used to receive and process the pressure signal from the sensing element, and the substrate is used to mount and fix the sensor chip. This arrangement of the sensor chip, which is closer to the sensing element, shortens the signal transmission distance, responds to pressure changes more quickly, and has higher detection efficiency and accuracy. At the same time, the sensing element covers the sensor chip, ensuring that the entire pressure sensing area of ​​the sensor chip can receive the pressure signal, thereby improving the stability and accuracy of the results.

[0023] Preferably, the housing includes a body and a cover, the body and the enclosure are an integral structure, and the cover is fixedly connected to the body to form a receiving cavity for accommodating the sensor chip; the buffer channel is partially disposed on the enclosure and partially disposed on the body, such that the length of the buffer channel is greater than the thickness of the enclosure.

[0024] The cover helps protect the internal sensing components; the body and the enclosure are an integral structure, and the body, enclosure and buffer channel can be cast as one piece, avoiding damage to the enclosure structure and ensuring the integrity and structural strength of the enclosure; at the same time, the length of the buffer channel is greater than the thickness of the enclosure, providing installation space for the sensing unit in the buffer channel and ensuring the distance between the sensing position and the fluid in the inner cavity, so as to protect the sensing unit.

[0025] Preferably, the sensor chip is connected to a wire, and the cover is provided with a wire hole for the wire to pass through. The wire is used to transmit the sensor chip data to the control and analysis center.

[0026] Preferably, the length of the buffer channel is L1, and the maximum distance from the sensing position to the inner surface of the enclosure is L2, where 0.3 ≤ L2 / L1 < 1. Controlling the ratio of the two is beneficial for reducing the formation of fluid dead zones in the buffer channel, while also ensuring the stability and accuracy of the measurement results. If the ratio is too large, the distance from the sensing position to the inner end of the buffer channel is too long, i.e., the measurement segment is too long, and the fluid flow in the measurement segment is poor, making it easy to form dead zones. If the ratio is too small, the sensing position is too close to the inner end of the buffer channel, i.e., the measurement segment is too short, and the fluid fluctuations in the segment are still relatively large, making the sensing position easily affected by fluid fluctuations and reducing the stability and accuracy of the measurement results.

[0027] Preferably, the cross-sectional area of ​​the buffer channel is S1, and the area of ​​the sensing position exposed in the buffer channel is S2, where 0.3 ≤ S2 / S1 ≤ 0.9. Controlling the ratio of the two is beneficial for ensuring the sealing between the sensing position and the buffer channel, as well as ensuring that the fluid flowing into the buffer channel is in full contact with the sensing position and applies pressure evenly to the sensing position, thus ensuring the stability of the pressure sensing results. If the ratio is too large, it indicates that the cross-sectional area of ​​the sensing position is too large, leaving insufficient space for the sealing element, which can easily lead to a decrease in the sealing between the sensing position and the buffer channel. If the ratio is too small, it indicates that the cross-sectional area of ​​the sensing position is too small, and the area of ​​the sensing position receiving fluid pressure is too small, resulting in the interaction between the fluid pressure and the sensing position being mainly instantaneous force, which can easily cause the measurement results to deviate too much from the true results, thereby reducing the stability and accuracy of the measurement results.

[0028] Preferably, the maximum distance from the sensing position to the inner surface of the enclosure is L2, and the length of the seal in the buffer channel is L3, where 0.1 ≤ L3 / L2 ≤ 0.9. Controlling the ratio of the two is beneficial for ensuring the sealing between the sensing position and the buffer channel, as well as for ensuring the stability and accuracy of the measurement results. If the ratio is too small, it means that the distance occupied by the seal in the buffer channel is too short, resulting in an excessively long measurement section. Due to the poor fluid flow in the measurement section, a dead zone is easily formed. At the same time, the sealing connection area of ​​the seal to the sensing part is too small, which easily leads to a poor sealing connection effect. If the ratio is too large, it means that the distance occupied by the seal in the buffer channel is too long, resulting in an excessively short measurement section. The sensing position is easily affected by fluid fluctuations, which reduces the stability and accuracy of the measurement results.

[0029] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0030] This utility model's pressure measurement system determines the fluid state by detecting the pressure of the fluid flowing inside the test tube. Specifically, as the fluid in the inner cavity of the test tube flows axially along the tube, the fluid also fills the buffer channel, which is connected to the inner cavity, to contact the sensing element within the buffer channel. This allows the sensing element to sense the fluid pressure from the inner cavity, meaning the sensing element generates a pressure signal by sensing the fluid pressure and deforming. Furthermore, by providing a buffer channel with a gap between the sensing element and the inner surface of the surrounding wall (the fluid state within this gap is less fluid than that within the inner cavity), the fluid pressure inside the inner cavity needs to pass through the relatively stable fluid within the gap before being transmitted to the sensing element. This helps reduce the deformation of the sensing element caused by dynamic fluctuations in the fluid within the inner cavity, thereby improving the stability and accuracy of the measurement results. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the pressure measurement system according to Embodiment 1 of this utility model.

[0033] Figure 2 This is a cross-sectional schematic diagram of the pressure measurement system according to Embodiment 1 of this utility model.

[0034] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0035] Figure 4 This is a cross-sectional schematic diagram of the pressure measurement system according to Embodiment 2 of this utility model.

[0036] Explanation of reference numerals in the attached figures

[0037] 10. Test tube; 11. Inner cavity; 12. Enclosure; 121. Inner surface; 122. Outer surface; 13. Port;

[0038] 20. Sensing part; 21. Sensing position; 211. Sensing center; 212. Sensing perimeter;

[0039] 30. Buffer channel; 31. Measurement section; 311. Initial section; 312. Extension section;

[0040] 40. Mounting part; 41. Seal; 42. Exposed opening;

[0041] 50. Shell; 51. Body; 52. Cover; 53. Receiving cavity;

[0042] 60. Sensor chip; 61. Wire;

[0043] 70. Substrate. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] Example 1

[0048] like Figures 1 to 3As shown in the figure, this utility model discloses a pressure measurement system, including a test tube 10 and a sensing unit 20. The test tube 10 includes an inner cavity 11 that receives fluid that changes upon contact with the sensing unit 20, a surrounding wall 12 that surrounds the inner cavity 11, and ports 13 located at both ends of the inner cavity 11 along its axial direction. The surrounding wall 12 includes an inner surface 121 that contacts the inner cavity 11 and an outer surface 122 that is opposite to the inner surface 121. The test tube 10 is used for fluid flow, forming a flow channel within the inner cavity 11. The fluid flows from one port 13 along the inner cavity 11 to the other port 13. It should be noted that in this embodiment, the axial direction refers to the axial direction of the test tube 10, which is also the flow direction of the fluid within the inner cavity 11. The pressure measurement system of this embodiment also includes a housing 50 and a buffer channel 30. The housing 50 is set independently of the outer surface 122 of the enclosure wall 12. The buffer channel 30 extends from the inner surface 121 of the enclosure wall 12 toward the outer surface 122 of the enclosure wall 12, passing through the enclosure wall 12 and the housing 50 in sequence. The buffer channel 30 is connected to the inner cavity 11, so that fluid can fill into the buffer channel 30. In this embodiment, the sensing unit 20 is at least partially located in the buffer channel 30 and is fluid-sealed with the inner wall of the buffer channel 30. The buffer channel 30 includes at least a measuring section 31, which is connected to the inner cavity 11. The boundary of the measuring section 31 is defined by the sensing unit 20. The measuring section 31 includes an initial section 311 and an extension section 312. The initial section 311 is located on the enclosure wall 12 and is connected to the inner cavity 11. The extension section 312 is located on the housing 50 and is connected to the initial section 311.

[0049] Specifically, the sensing part 20 is a deformable component, including a sensing position 21 facing the inner cavity 11. The sensing position 21 is exposed in the measuring section 31 to sense changes in the fluid state from the inner cavity 11. The area from the sensing position 21 to the inner end of the buffer channel 30 (where the inner end of the buffer channel 30 is the opening of the buffer channel 30 on the inner surface 121 of the enclosure wall 12, and since the inner surface 121 of the enclosure wall 12 is arc-shaped, the cut inner end is arc-shaped) is called the measuring section 31. In this embodiment of the pressure measurement system, as the fluid in the inner cavity 11 of the test tube 10 flows axially along the test tube 10, the fluid also fills the buffer channel 30, which is connected to the inner cavity 11. The fluid properties within the buffer channel 30 stabilize as the length of the buffer channel 30 increases (i.e., fluid fluctuations decrease), allowing it to contact the sensing unit 20 (which can be located inside or outside the buffer channel 30). This allows the sensing position 21 of the sensing unit 20 to sense the fluid pressure from the inner cavity 11. In other words, the sensing unit 20 senses the fluid pressure through the sensing position 21 and deforms to generate a pressure signal; this signal is transmitted through the outer surface 122 of the test tube 10. A housing 50, independent of the test tube 10, is provided, and a buffer channel 30 extends through the space between the enclosure wall 12 and the housing 50 wall, thereby increasing the length of the buffer channel 30. This allows the measuring section 31 of the buffer channel 30 to have an additional extension section 312 at the end of the initial section 311 away from the inner cavity 11, further extending the distance between the sensing position 21 inside and the inner end of the buffer channel 30. In other words, the fluid pressure inside the inner cavity 11 needs to pass through the highly stable fluid in the measuring section 31 of the buffer channel 30 before being transmitted to the sensing position 21. This helps to reduce the deformation of the sensing position 21 caused by the dynamic fluctuations of the fluid inside the inner cavity 11, thereby improving the stability and accuracy of the measurement results. In addition, the housing 50 is independently located on the outer surface 122 of the enclosure wall 12, ensuring the overall independence of the enclosure wall 12 and preventing damage to the enclosure wall 12 during processing.

[0050] like Figure 2 As shown, the buffer channel 30 extends in a direction perpendicular to the axis of the test tube 10, that is, the buffer channel 30 extends radially along the test tube 10, while the sensing position 21 is set perpendicular to the inner wall of the buffer channel 30, that is, perpendicular to the radial direction of the test tube 10. This setting makes the orientation of the sensing position 21 perpendicular to the fluid flow direction in the test tube 10, which can also reduce the impact of fluid flow on the diaphragm and reduce dynamic pressure fluctuations caused by changes in flow rate; this helps to provide a more stable pressure reading.

[0051] like Figure 3As shown, the sensing position 21 in this embodiment includes a sensing center 211 and a sensing periphery 212. In its natural state, the sensing center 211 is recessed away from the inner cavity 11 relative to the sensing periphery 212. That is, the sensing periphery 212 is closer to the inner cavity 11 than the sensing center 211. This arrangement can cause the fluid to accumulate completely in the sensing position 21, making the fluid pressure more evenly distributed in the sensing position 21, improving the detection accuracy, and reducing the possibility of local pressure concentration. This helps to extend the service life of the sensing unit 20 and reduce fatigue damage caused by stress concentration. It also enables the detection element (such as the sensor chip 60) to more sensitively capture small pressure changes and quickly transmit the deformation caused by pressure, so that the sensing unit 20 can respond to pressure changes more quickly and is suitable for rapidly changing fluid systems.

[0052] To facilitate the installation of the sensing part 20 in the buffer channel 30, the shape of the sensing part 20 can be cylindrical or conical. Preferably, in this embodiment, the end of the sensing part 20 near the inner cavity 11 extends conically towards the end away from the inner cavity 11, that is, the whole is close to a cone shape. The conical shape of the sensing part 20 makes the upper area of ​​the sensing part 20 small enough to be assembled into the buffer channel 30, while the bottom area of ​​the sensing part 20 is increased, which can ensure that the entire pressure sensing area of ​​the detection element (such as the sensor chip 60) can receive the pressure signal, thereby improving the stability and accuracy of the measurement.

[0053] The sensing element 20 is a deformation element. The pressure change is determined based on the deformation of the sensing element 20. Preferably, the sensing element 20 is a gel or elastic diaphragm. The gel or elastic diaphragm deforms by sensing the pressure of the fluid, which causes a change in the distribution of the electric field inside it, thereby determining the magnitude of the applied pressure. It is suitable for dynamic pressure measurement, has high sensitivity, temperature resistance and chemical stability, and the preparation process is simple and suitable for mass production.

[0054] like Figure 3 As shown, the pressure measurement system also includes a seal 41, which surrounds the outer periphery of the sensing position 21 and provides a fluid seal with the inner wall of the buffer channel 30. The sensing position 21 is recessed relative to the seal 41 in a direction away from the inner cavity 11. The function of the seal 41 is to seal the sensing part 20, preventing fluid from entering between the sensing part 20 and the inner wall of the buffer channel 30. At the same time, the recess of the sensing position 21 relative to the seal 41 also promotes the complete accumulation of fluid within the sensing position 21, resulting in a more uniform distribution of fluid pressure within the sensing position 21 and improving detection accuracy. The seal 41 can be a sealing ring or other sealing element. In some other embodiments, the sensing position 21 and the inner wall of the buffer channel 30 are in direct contact and form an interference fit, i.e., there is no seal 41 between them.

[0055] As a preferred embodiment, in this case, Figure 2As shown, the pressure measurement system also includes a mounting part 40; the portion of the mounting part 40 extending into the extension section 312 of the buffer channel 30 forms a seal 41, and the sensing part 20 is located inside the mounting part 40. The mounting part 40 has an exposure port 42, through which the sensing part 20 is exposed to the measuring section 31. By setting the seal 41 as part of the mounting part 40, there is no need to set a separate seal 41 in the buffer channel 30, reducing the difficulty of setting a seal 41 in the buffer channel 30, and the structure is simple and easy to process. The mounting part 40 is also used to receive and protect the sensing part 20. When the fluid state changes, it is transmitted to the buffer channel 30 and contacts the sensing position 21 of the sensing part 20, ensuring that the sensing part 20 does not move as a whole while deforming accurately, thus improving the detection accuracy.

[0056] like Figure 2 As shown, the pressure measurement system also includes a sensor chip 60 and a substrate 70. The substrate 70 is disposed within the housing 50, and the sensor chip 60 is fixed within the housing 50 via the substrate 70. The housing 50 serves to fix and protect the sensor chip 60 and the substrate 70. The housing 50 is independently located on the outer surface 122 of the enclosure 12, ensuring the overall independence of the enclosure 12 and preventing damage to the enclosure 12 during processing. The sensor chip 60 is used to receive signals from the sensing unit 20 and determine changes in the fluid pressure state. The substrate 70 is used to mount and fix the sensor chip 60. One end of the sensing unit 20 connected to the substrate 70 covers the sensor chip 60, so that the sensing unit 20 and the sensor chip 60 are correspondingly positioned. This arrangement brings the sensor chip 60 closer to the sensing unit 20, shortening the signal transmission distance, enabling faster response to pressure changes, and improving detection efficiency and accuracy. Simultaneously, controlling the sensing unit 20 to cover the sensor chip 60 ensures that the entire pressure sensing area of ​​the sensor chip 60 can receive pressure signals, thereby improving the stability and accuracy of the results.

[0057] Of course, in some embodiments, the sensing unit 20 independently completes the conversion of deformation into electrical signal and remotely transmits the electrical signal to the sensor chip 60. The sensor chip 60 may also be separated from the sensing unit 20 instead of being fixed to the test tube 10.

[0058] like Figure 2As shown, the housing 50 includes a body 51 and a cover 52. The cover 52 is fixedly connected to the body 51 to form a receiving cavity 53 for accommodating the sensor chip 60. The receiving cavity 53 is also used to accommodate and install the substrate 70 and the mounting part 40. The cover 52 helps to protect the internal sensing components. The body 51 and the enclosure 12 are an integral structure. The body 51, the enclosure 12 and the buffer channel 30 can be integrally cast to avoid damage to the structure of the enclosure 12 and to ensure the integrity and structural strength of the enclosure 12. The buffer channel 30 is partially disposed on the enclosure 12 and partially disposed on the body 51, so that the length of the buffer channel 30 is greater than the thickness of the enclosure 12. This provides installation space for the sensing part 20 in the buffer channel 30 and ensures the distance between the sensing position 21 and the fluid in the inner cavity 11, so as to protect the sensing part 20 and reduce the interference of the fluid on the sensing position 21, thereby improving the detection accuracy.

[0059] Generally, the control and analysis center is set up independently and is not located on the test tube 10. Therefore, the sensor chip 60 is connected to the wire 61, and the cover 52 is provided with a wire hole for the wire 61 to pass through. The wire 61 is used to transmit the data of the sensor chip 60 to the control center to meet the control requirements.

[0060] Of course, in some embodiments, if only pressure changes need to be detected and recorded, a control and analysis center may not be required, and the sensor chip 60 may not be connected to the wire 61.

[0061] like Figure 3 As shown, the length of the buffer channel 30 is L1, and the maximum distance from the sensing position 21 to the inner end of the buffer channel 30 is L2, 0.3≤L2 / L1<1; this is beneficial for reducing the formation of fluid dead zones within the buffer channel 30 and ensuring the stability and accuracy of the measurement results. The cross-sectional area of ​​the buffer channel 30 is S1, and the area of ​​the sensing position 21 exposed in the buffer channel 30 is S2, 0.3≤S2 / S1≤0.9; controlling the ratio of these two values ​​is beneficial for ensuring the sealing between the sensing position 21 and the buffer channel 30, ensuring sufficient contact between the fluid flowing into the buffer channel 30 and the sensing position 21, and applying uniform pressure to the sensing position 21, thus ensuring the stability of the pressure sensing results. The maximum distance from the sensing position 21 to the inner end of the buffer channel 30 is L2, and the length of the sealing element 41 in the buffer channel 30 is L3, 0.1≤L3 / L2≤0.9; controlling the ratio of these two values ​​is beneficial for ensuring the sealing between the sensing position 21 and the buffer channel 30, and ensuring the stability and accuracy of the measurement results.

[0062] Example 2

[0063] The difference between this embodiment and Embodiment 1 is that, as Figure 4As shown, in this embodiment, the sensing part 20 is located outside the extension 312 of the buffer channel 30, and the mounting part 40 is liquid-sealed with the end of the extension 312 of the buffer channel 30 away from the inner cavity 11. This embodiment avoids the process of extending the mounting part 40 into the buffer channel 30, which simplifies the manufacturing process and ensures the structural integrity of the mounting part 40.

[0064] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A pressure measurement system, comprising a test tube and a sensing element, the test tube comprising an inner cavity receiving fluid that changes upon contact with the sensing element, a surrounding wall of the inner cavity, and ports located at both axial ends of the inner cavity, the surrounding wall comprising an inner surface that contacts the inner cavity and an outer surface that is opposite to the inner surface; Its features ； It also includes a buffer channel and a shell, wherein the shell is set independently of the outer surface of the enclosure wall, the buffer channel extends from the inner surface of the enclosure wall toward the outer surface of the enclosure wall and passes through the enclosure wall and the shell wall in sequence, and the buffer channel is in communication with the inner cavity; The buffer channel includes at least a measuring section extending along the inner surface of the enclosure towards the outer surface of the enclosure. The measuring section includes an initial section and an extension section, wherein the initial section is disposed on the enclosure and communicates with the inner cavity, and the extension section is disposed on the housing and communicates with the initial section. The sensing element is fluid-sealed with the buffer channel. The sensing element is a deformable component, including a sensing position facing the inner cavity, the sensing position being exposed within the measuring section to sense the pressure of fluid from within the inner cavity.

2. The pressure measurement system as described in claim 1, characterized in that, The sensing element extends at least partially into the extension of the buffer channel.

3. The pressure measurement system as described in claim 1, characterized in that, The buffer channel extends in a direction perpendicular to the axis of the tube being tested.

4. The pressure measurement system as described in claim 1, characterized in that, The sensing position includes a sensing center and a sensing periphery. In its natural state, the sensing center tends to be recessed in a direction away from the inner cavity relative to the sensing periphery. And / or, The sensing element extends in a cone shape from the end near the inner cavity to the end away from the inner cavity.

5. The pressure measurement system as described in claim 1, characterized in that, The sensing element is a gel or an elastic membrane.

6. The pressure measurement system as described in any one of claims 1-2, characterized in that, It also includes a seal that surrounds the outer periphery of the sensing position and fluidly seals with the buffer channel; the sensing position is recessed relative to the seal in a direction away from the inner cavity.

7. The pressure measurement system as described in claim 6, characterized in that, It also includes a mounting portion, a portion of which extends into an extension of the buffer channel to form the seal, the sensing portion being located within the mounting portion, the mounting portion having an exposure port through which the sensing portion is exposed to the measuring section.

8. The pressure measurement system as described in claim 1, characterized in that, It also includes a sensor chip and a substrate. The sensor chip is fixed in the housing by the substrate. One end of the sensing part is connected to the substrate and covers the sensor chip, so that the sensing part and the sensor chip are correspondingly arranged.

9. The pressure measurement system as described in claim 8, characterized in that, The housing includes a body and a cover. The body and the enclosure are an integral structure. The cover is fixedly connected to the body to form a cavity for accommodating the sensor chip.

10. The pressure measurement system as described in claim 9, characterized in that, The sensor chip is connected to a wire, and the cover has a wire hole for the wire to pass through.

11. The pressure measurement system as described in claim 1, characterized in that, The length of the buffer channel is L1, and the maximum distance from the sensing position to the inner surface of the enclosure is L2, where 0.3 ≤ L2 / L1 < 1; And / or, The cross-sectional area of ​​the buffer channel is S1, and the area of ​​the sensing position exposed in the buffer channel is S2, where 0.3 ≤ S2 / S1 ≤ 0.

9.

12. The pressure measurement system as described in claim 6, characterized in that, The maximum distance from the sensing position to the inner surface of the enclosure is L2, and the length of the seal in the buffer channel is L3, where 0.1 ≤ L3 / L2 ≤ 0.9.

Images