Sensing device

Abstract

The application provides a sensing device, which comprises a first shell with three accommodating portions, a sensing module with a printed circuit board assembly and a pressure sensor, and a sensing module fixing member. The first accommodating portion accommodates and fixes the sensing module fixing member. The second accommodating portion accommodates the sensing module. The third accommodating portion is arranged side by side with the second accommodating portion. There is a communication hole between the first accommodating portion and the second accommodating portion, and the pressure sensor is butted with a pressure channel of the sensing module fixing member through the communication hole. The printed circuit board assembly is encapsulated and fixed in the second accommodating portion filled with a solidified sealing body. The sensing device of the application adopts a unique three-accommodating-portion integrated lower shell and a sensing module fixing member fixing structure between a pipeline / cavity to be measured and the pressure sensor, constructs a sealing unit with high integrity and high pressure resistance, and significantly improves the sealing property and long-term reliability of the device in a high-pressure-difference environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure sensing, in particular to a sensing device. BACKGROUND

[0002] Traditional detection devices for monitoring the pressure inside a pipeline or fire extinguisher usually use a sealing structure (such as a sealing ring) to achieve isolation between the measured internal cavity and the pressure sensor. However, in actual application, especially in high-pressure or high-pressure fluctuation environments, static sealing structures are prone to failure due to material aging, assembly errors or stress deformation, resulting in a decrease in the airtightness of the device, and even leakage. Once the pressure difference between the measured internal cavity and the monitoring device is too large, the sealing structure will be difficult to maintain a reliable sealing state, which not only affects the accuracy of pressure measurement, but also may cause safety hazards, reducing the overall reliability of the monitoring device. Therefore, how to design a pressure sensing device that can resist high pressure difference, ensure long-term reliable sealing, and facilitate production assembly and function integration has become a technical problem to be solved in the field. SUMMARY

[0003] In order to overcome the above-mentioned defects, the technical scheme of the present application provides a novel sensing device, which adopts a unique three-container integrated lower shell and fixed sensing module fixing structure between the measured pipeline / internal cavity and the pressure sensor, and constructs a sealing unit with high integrity and high pressure resistance, which significantly improves the airtightness and long-term reliability of the device in high pressure difference environment.

[0004] The present application provides a sensing device for high-pressure environment pressure monitoring, comprising:

[0005] a first shell;

[0006] a sensing module comprising a printed circuit board assembly and a pressure sensor protruding on the printed circuit board assembly;

[0007] a sensing module fixing member provided with an interface for communicating with a measured pressure source;

[0008] wherein the first shell comprises:

[0009] a first container for accommodating and fixing the sensing module fixing member;

[0010] a second container for accommodating the printed circuit board assembly; and

[0011] a third container arranged side by side with the second container;

[0012] The first accommodating part is arranged below the second accommodating part and the third accommodating part, and a communication hole is arranged between the first accommodating part and the second accommodating part, and the pressure sensor is connected with the pressure channel of the sensing module fixing member through the communication hole;

[0013] The second accommodating part is filled with a cured sealing body, and the cured sealing body encapsulates and fixes the printed circuit board assembly in the second accommodating part.

[0014] The third accommodating part is formed by an integral molding process, so that the third accommodating part is physically isolated from the first accommodating part and the second accommodating part.

[0015] In one embodiment, the sensing module fixing member is a tee-shaped member, which includes a common port connected with the pressure sensor, a normally open port for connecting a pressure source to be measured, and a sealed normally closed port.

[0016] The projection of the normally open port in the Z direction is located in the region of the third accommodating part, and the projection of the normally closed port in the Z direction is located in the region of the second accommodating part.

[0017] In one embodiment, the second accommodating part and the third accommodating part are separated by a partition plate.

[0018] A protruding reinforcing rib is arranged on the inner side wall of the first shell of the second accommodating part, and / or on the inner side wall of the partition plate of the second accommodating part.

[0019] In one embodiment, the surface of the reinforcing rib is provided with at least one groove in the Z direction.

[0020] In one embodiment, the partition plate is provided with a height identification line for indicating the filling height of the cured sealing body.

[0021] In one embodiment, the third accommodating part is used for accommodating a power supply battery, and the third accommodating part is not communicated with the first accommodating part.

[0022] In one embodiment, the accommodating space of the second accommodating part is less than or equal to the accommodating space of the third accommodating part.

[0023] In one embodiment, the first accommodating part and the sensing module fixing member are integrally formed by insert injection molding.

[0024] In one embodiment, the sensing module further comprises:

[0025] A sensor sealing ring is sleeved on the outside of the pressure sensor.

[0026] A waterproof and breathable film covers the air inlet of the pressure sensor.

[0027] A dust screen is fixed to the pressure sensor by laser welding and presses the waterproof and breathable membrane.

[0028] In one embodiment, the sensing module further comprises:

[0029] A temperature sensor is disposed on the printed circuit board assembly and is located on a different surface from the pressure sensor.

[0030] The present application has at least the following advantages or benefits:

[0031] 1. The sensing device provided by the present application builds a high-reliability, easy-to-assemble pressure sensing device foundation through the unique three- containing part integrated lower shell (first shell) and fixed sensing module fixing structure. The specific benefits include:

[0032] The first shell includes an integrally formed first containing part, a second containing part, and a third containing part: this structure realizes clear functional zoning. The first containing part is dedicated to fixing the pressure interface sensing module fixing part, the second containing part serves as the core sensing and sealing cabin, and the third containing part provides independent space for other functions such as the battery. Integrally forming makes the third containing part physically isolated (water isolated, electrically isolated, air isolated, vibration isolated) from the first containing part and the second containing part, ensuring the overall strength and dimensional accuracy of the structure and eliminating the risk of leakage and alignment errors that may be caused by separate assembly.

[0033] The first containing part is used to accommodate and fix the sensing module fixing part, clearly defining the fixed position of the pressure interface, so that the load from the pressure to be measured directly acts on the first containing part area, laying the foundation for overall pressure bearing.

[0034] The second containing part is filled with a cured sealing body, which encapsulates and fixes the printed circuit board assembly within the second containing part: by filling the sealing glue in this specific second containing part and curing it, a rigid sealing block is formed that completely wraps and integrates with the sensing module. This cured sealing body not only provides an ultimate sealing barrier, but more importantly, it conducts and disperses the fluid pressure borne by the pressure sensor to the entire second containing part side wall and bottom, realizing the transformation from point stress to surface pressure bearing, greatly improving the device's ability to resist high pressure and prevent interface leakage.

[0035] 2、The sensing device provided by the application, the sensing module fixing member is a three-way piece (the three-way piece can be a T-shaped nut), the three-way piece optimizes the internal mechanical transmission path and interface layout. The projection position relationship of the sensing module fixing member and each interface is clear, the projection area of the normally open port subjected to external high pressure is directed to the third containing part side with independent structure and no sealing glue, and the sealing end normally closed port is directed to the second containing part side with a solidified sealing body. This layout cleverly utilizes the structural characteristics of different functional areas, guides the main pressure load to act on the area that is more solid and easier to bear, further optimizes the internal stress distribution of the device under high pressure, and improves the robustness of the overall structure.

[0036] 3、The sensing device provided by the application, the design of the reinforcing rib significantly increases the stiffness and anti-deformation ability of the second containing part side wall. At the same time, it greatly increases the contact surface area and mechanical bonding force between the solidified sealing body and the first shell, so that they can still be firmly combined under long-term high pressure load and prevent peeling.

[0037] 4、The sensing device provided by the application further provides a key mechanical locking function to resist sealing failure. The grooves on the surface of the reinforcing rib form a firm mechanical interlocking structure after the solidification of the liquid sealant. When the internal high pressure generates an upward thrust on the sealant block, the grooves can effectively anchor the sealant and prevent any slight displacement or sliding of the sealant at the bonding interface, thereby solving the problem of sealing interface failure due to shear force in a high pressure environment. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0039] Figure 1 The exploded view of the sensing device provided by the embodiment of the application;

[0040] Figure 2 The exploded view of the sensing module in the sensing device provided by the embodiment of the application;

[0041] Figure 3 The internal structure schematic diagram of the first shell in the sensing device provided by the embodiment of the application;

[0042] Figure 4 The internal structure top view of the first shell in the sensing device provided by the embodiment of the application;

[0043] Figure 5A schematic view of the second accommodating portion of the first shell filled with shell sealant in the sensing device provided by the embodiment of the present application;

[0044] Figure 6 A structural schematic view of the second accommodating portion of the first shell along the Z direction in the sensing device provided by the embodiment of the present application.

[0045] Icon:

[0046] Sensing device 100:

[0047] Shell 10: first shell 11, second shell 12;

[0048] First accommodating portion 121, second accommodating portion 122, third accommodating portion 123, partition plate 124, reinforcing rib 122a, height identification line 122b;

[0049] Sensing module 20: printed circuit board assembly 21, pressure sensor 22, sensor seal ring 23, waterproof and breathable film 24, dust screen 25, temperature sensor 26;

[0050] Sensing module fixing member 30: common port 31, normally open port 32, normally closed port 33;

[0051] Power module 40: power supply battery 41, positive electrode battery piece 42, negative electrode battery piece 43;

[0052] Switch module 50;

[0053] Shell sealing module 60: solidified sealing body 61, shell seal ring 62. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0056] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0057] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0058] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] Please refer to Figures 1-6 The present application provides a sensing device 100 for monitoring the pressure inside a pipe or a fire extinguisher.

[0061] In one embodiment of the present application, the sensing device 100 comprises a first housing 11, a sensing module 20, and a sensing module fixing member 30. As shown in Figure 1 and Figure 6 The sensing device 100 can include a housing 10 composed of a first housing 11 and a second housing 12 connected by a separable connection.

[0062] The sensing module 20 can include a printed circuit board assembly 21 and a pressure sensor 22 protruding from the printed circuit board assembly 21. The printed circuit board assembly 21 includes a PCB board and a trace disposed on the PCB board, and also includes packaged electronic components. The pressure sensor 22 can be protrudingly disposed on the PCB board by a welding scheme. The printed circuit board assembly 21 also has a chip that can process data and convert electrical signals into wireless signals to be transmitted to a data receiver. As shown in Figure 2The sensing module 20 also includes, in sequence, a sensor sealing ring 23, a waterproof and breathable film 24, a dust screen 25, and a temperature sensor 26.

[0063] The sensing module fixing member 30 is used to fix the sensing module 20. The sensing module fixing member 30 is provided with an interface for communication with a pressure source to be measured.

[0064] As shown in Figure 1 and Figure 3 The first housing 11 includes a first accommodating portion 121, a second accommodating portion 122, and a third accommodating portion 123. The first accommodating portion 121 is used to accommodate and fix the sensing module fixing member 30. The second accommodating portion 122 is used to accommodate the printed circuit board assembly 21. The third accommodating portion 123 is arranged side by side with the second accommodating portion 122. The first accommodating portion 121 is arranged below the second accommodating portion 122 and the third accommodating portion 123. A communication hole is arranged between the first accommodating portion 121 and the second accommodating portion 122, and the pressure sensor 22 is butted against the pressure channel of the sensing module fixing member 30 through the communication hole. The second accommodating portion 122 is filled with a solidified sealing body 61, which encapsulates and fixes the printed circuit board assembly 21 in the second accommodating portion 122.

[0065] Specifically, when the sensing device 100 is installed, the pressure sensor 22 on the printed circuit board assembly 21 is aligned with the communication hole between the first accommodating portion 121 and the second accommodating portion 122, and then the printed circuit board assembly 21 is pressed so that the pressure sensor 22 is completely immersed in the sensing module fixing member 30. Then, 20mm high epoxy resin is poured into the second accommodating portion 122 to form the solidified sealing body 61. When the sensing device 100 collects air pressure, the pressure sensor 22 will have an upward thrust. Since the solidified sealing body 61 in the sensing device 100 has solidified, the solidified sealing body 61 and the pressure sensor 22 become an integral whole, which can effectively resist the upward thrust caused by air pressure, thereby improving the reliability of the product.

[0066] In this embodiment, a high-reliability and easy-to-assemble pressure sensing device foundation is constructed through a unique three-accommodating-portion integrated lower shell (first housing 11) structure. The specific beneficial effects include:

[0067] The first housing 11 comprises a first accommodating portion 121, a second accommodating portion 122 and a third accommodating portion 123 which are integrally formed: this structure realizes clear functional division. The first accommodating portion 121 is dedicated to fixing the pressure interface sensing module fixing member 30, the second accommodating portion 122 serves as the core sensing and sealing cabin, and the third accommodating portion 123 provides independent space for other functions such as the battery. Integrally forming makes the third accommodating portion 123 physically isolated (water isolation, electrical isolation, gas isolation, vibration isolation) from the first accommodating portion 121 and the second accommodating portion 122, ensuring the overall strength and dimensional accuracy of the structure, and eliminating the risk of leakage and alignment errors that may be caused by separate assembly.

[0068] The first accommodating portion 121 is used to accommodate and fix the sensing module fixing member 30, clearly defining the fixed position of the pressure interface, so that the load from the pressure to be measured directly acts on the area of the first accommodating portion 121, laying the foundation for overall pressure bearing.

[0069] The second accommodating portion 122 is filled with a cured sealing body 61 which encapsulates and fixes the printed circuit board assembly 21 within the second accommodating portion 122: by filling the sealing glue in this specific second accommodating portion 122 and curing, a rigid sealing block is formed which completely wraps and integrates with the sensing module 20. This cured sealing body 61 not only provides the ultimate sealing barrier, but more importantly, the cured sealing body 61 conducts and disperses the fluid pressure borne by the pressure sensor 22 to the entire side wall and bottom of the second accommodating portion 122, realizing the transformation from point force to surface pressure bearing, greatly improving the ability of the device to resist high pressure and prevent interface leakage.

[0070] Please refer to Figure 1 、 Figure 3 、 Figure 5 and Figure 6 In one embodiment, the sensing module fixing member 30 is a three-way piece (which can be provided as a T-shaped nut) which comprises a common port 31 which is connected to the pressure sensor 22, a normally open port 32 which is used to connect the pressure source to be measured, and a sealed normally closed port 33. Among them, the projection of the normally open port 32 in the Z direction is located in the area of the third accommodating portion 123, and the projection of the normally closed port 33 in the Z direction is located in the area of the second accommodating portion 122.

[0071] In this embodiment, 1. The normally open port 32 is the entrance of the external high-pressure medium, which bears the maximum pressure impact and fluctuation. Projecting it into the third accommodating part 123 means that the main pressure input point is vertically aligned and isolated in space from the sensing sealing unit of the core located in the second accommodating part 122. The high-pressure load is physically isolated (water isolation, air isolation, electrical isolation, vibration isolation) after entering the sensing device 100, and the initial transmission path of its force is guided to the third accommodating part 123 area mainly composed of the first shell 11. This is equivalent to setting a structural buffer zone for high-pressure impact, which uses the strength and rigidity of the shell itself for the first stage of absorption and dispersion, thereby avoiding the direct and frontal impact of high-pressure fluid energy on the core's glue-filled sealing body and fragile sensor welding points. This significantly reduces the risk of fatigue failure of the sealing interface due to direct bearing of high-pressure pulses.

[0072] 2. The normally closed port 33 as the closed end of the three-way pressure chamber has a tendency to slightly expand outward under internal pressure. The second accommodating part 122 is the area where the epoxy resin sealant (cured sealing body 61) forms a high-strength cured body. Projecting the normally closed port 33 into the second accommodating part 122 makes the normally closed port 33 no longer rely on ordinary cavities or thin walls for support, but on the composite structure formed by the cured sealant and the shell, which has extremely high rigidity. This provides a solid support wall for the normally closed port 33, greatly suppressing any slight deformation under pressure and ensuring the geometric stability of the entire three-way internal pressure chamber. Stable cavities are the basis for accurate and long-term measurement of pressure sensors.

[0073] 3. Assuming that the third accommodating part 123 is used to house batteries or other components that may generate heat, and the second accommodating part 122 is a precise electronic sensing area. The technical solution in this embodiment can also achieve heat management and vibration isolation. By vertically locating the high-pressure fluid inlet normally open port 32 and functional units such as batteries in the same projection area, the third accommodating part 123, and placing the sensing module 20 in the projection area of the second accommodating part 122, the main heat source / disturbance source is essentially vertically partitioned in space structure from the core signal acquisition unit. This layout can effectively block the heat or vibration caused by fluid pulsation that may be transmitted by high-pressure pipelines, directly affecting the pressure sensor and temperature sensor, thereby improving the stability and accuracy of signal acquisition.

[0074] In this embodiment, the sensing module fixing member 30 is a three-way piece (which can be a T-shaped nut), and the three-way piece optimizes the internal mechanical transmission path and interface layout. The projection position relationship of the sensing module fixing member 30 and its interfaces is clear, the projection area of the normally open port 32 that bears external high pressure is directed to the third accommodating part 123 side with independent structure and no sealing glue, and the sealing end normally closed port 33 is directed to the second accommodating part 122 side with a solidified sealing body. This layout cleverly utilizes the structural characteristics of different functional areas, guides the main pressure load to act on the area that is more solid and easier to bear, further optimizes the internal stress distribution of the device under high pressure, and improves the robustness of the overall structure.

[0075] Please refer to Figure 3 , Figure 4 and Figure 6 In one embodiment, the second accommodating part 122 and the third accommodating part 123 are separated by a partition 124. The first shell 11 inside the second accommodating part 122 has a protruding reinforcing rib 122a on the side wall, and / or the partition 124 is located on the side wall of the second accommodating part 122. The number of reinforcing ribs 122a can be one or more.

[0076] In this embodiment, the long-term structural stability and sealing durability of the sensing device 100 are further enhanced. The design of the reinforcing rib 122a significantly increases the stiffness and anti-deformation ability of the side wall of the second accommodating part 122. At the same time, it greatly increases the contact surface area and mechanical bonding force between the solidified sealing body and the first shell 11, so that they can still be firmly combined under long-term high pressure load and prevent peeling.

[0077] In one embodiment, the surface of the reinforcing rib 122a is provided with at least one groove in the Z direction. In this embodiment, a key mechanical locking function is further provided to resist sealing failure. The groove on the surface of the reinforcing rib 122a forms a firm mechanical interlocking structure after the sealing glue is solidified. When the internal high pressure generates an upward thrust on the sealing glue block, the groove can effectively anchor the sealing glue and prevent any slight displacement or sliding of the sealing glue at the bonding interface, thereby solving the problem of sealing interface failure due to shear force in a high pressure environment.

[0078] Please refer to Figure 6 In one embodiment, the partition 124 is provided with a height identification line 122b for indicating the filling height of the solidified sealing body 61. The height of the height identification line 122b can be set to 60%-95% of the overall height of the first shell 11 in the Z-axis direction. In one embodiment, the height value of the height identification line 122b is 20mm.

[0079] In the embodiment, the uniformity of the product sealing quality and the controllability of production can be ensured. The high identification line 122b provides an intuitive and accurate quantitative reference for the glue filling process, ensures the consistency of the volume and the coating range of the solidified sealing body in each product, and thus ensures the reliable reproduction of the sealing performance, avoiding the sealing weakness caused by insufficient glue or the internal stress problem caused by excessive glue.

[0080] In one embodiment, the third accommodating portion 123 is used to accommodate the power supply battery 41, and the third accommodating portion 123 is not communicated with the first accommodating portion 121. The power supply module 40 includes the power supply battery 41, the positive electrode battery sheet 42, and the negative electrode battery sheet 43, which are all arranged in the third accommodating portion 123.

[0081] In the embodiment, the functional safety isolation and the space optimization are realized. The power supply module 40 is independently arranged in the third accommodating portion 123, which is completely physically isolated from the second accommodating portion 122 for glue filling and sealing. This not only avoids any possible contact risk between the battery and the sealing glue, improves the electrical safety, but also makes the battery replacement and maintenance not interfere with the core sealing structure, and optimizes the space layout inside the device. In one embodiment, the space of the second accommodating portion 122 as the core sealing area is not greater than the third accommodating portion 123 as the battery compartment. On the premise of ensuring the space required by the sealing function, sufficient and possibly larger space is reserved for the power supply or other extended functions, so that the overall structure design is more balanced and practical.

[0082] In one embodiment, the first accommodating portion 121 and the sensing module fixing member 30 are integrally formed by inlay injection molding.

[0083] In the embodiment, the assembly of the sensing device 100 is extremely simplified, the connection is leak-proof, and the connection strength is extremely high. Through the inlay injection molding process, the materials of the sensing module fixing member 30 and the first shell 11 are combined at the molecular level, completely eliminating any assembly gap at the key interface, and realizing absolute sealing. At the same time, the process design of inlay injection molding of the first accommodating portion 121 and the sensing module fixing member 30 brings a connection strength far exceeding that of threaded connection or press-fit.

[0084] In one embodiment, the sensing module 20 further includes a sensor sealing ring 23, a waterproof and breathable membrane 24, and a dust screen 25.

[0085] The sensor sealing ring 23 is sleeved on the outside of the pressure sensor 22, and the sensor sealing ring 23 can prevent glue from penetrating around the pressure sensor 22 to achieve initial sealing. The waterproof and breathable film 24 covers the air inlet of the pressure sensor 22. The dust screen 25 is fixed on the pressure sensor 22 by laser welding and presses the waterproof and breathable film 24 tightly. The waterproof and breathable film 24 is adhered to the edge of the air inlet hole of the pressure sensor 22 with the adhesive side, and the dust screen 25 is laser welded on the edge of the pressure sensor to press the waterproof and breathable film 24 between the pressure sensor 22 and the dust screen 25, which can effectively prevent dust and water from entering the inside of the pressure sensor 22.

[0086] In this embodiment, the pressure sensor 22 is provided with a leading and reliable micro-environment protection. The combination of the laser-welded dust screen 25 and the waterproof and breathable film 24 forms a fine protection for the pressure sensing diaphragm of the sensor. Laser welding ensures the firm installation and edge sealing of the protective screen, effectively blocks dust, oil stains and liquid water, while allowing gas pressure to be transmitted without damage, greatly improving the long-term stability and service life of the pressure sensor 22 in harsh environments. In this embodiment, the design of the sensing module 20 enables the sensing device 100 to be applicable to all types of fire extinguishers (such as dry powder, water-based, pure gas fire extinguishers, etc.).

[0087] In one embodiment, the sensing module 20 further comprises a temperature sensor 26 arranged on the printed circuit board assembly 21 and located on a different surface from the pressure sensor 22.

[0088] In this embodiment, the monitoring dimension and data value of the device are expanded. The temperature sensor 26 is added and reasonably arranged on the printed circuit board to realize synchronous and accurate monitoring of temperature and pressure. This multi-parameter acquisition capability provides a richer data basis for equipment state diagnosis, environmental analysis and process control, and increases the product added value.

[0089] In one embodiment, the sensing device 100 also supports sleep and wake-up control modes. When the sensing device 100 monitors that the pressure value of the pressure sensor 22 is stable, the pressure data is collected every 60s, and at this time the sensing device 100 is in the sleep control mode, which can save power.

[0090] When the sensing device 100 monitors that the pressure value of the pressure sensor 22 changes, the data can be uploaded within 10ms, or an alarm can be given on the software, and at this time the sensing device 100 is in the wake-up control mode.

[0091] In one embodiment, the sensing device 100 also has a power monitoring function, which prompts to replace the battery when the voltage value is low. The power monitoring function realizes data monitoring by detecting the voltage of the battery.

[0092] In one embodiment, the sensing device 100 further comprises a switch module 50. The switch module 50 controls the operation of the pressure sensor 22 using a magnetic induction switch, reduces the opening in the interior of the shell 10, and makes the sensing device 100 as a whole achieve IP68 level waterproof and dustproof. When the magnet is close to the switch module 50 (magnetic induction switch), the indicator light of the switch module 50 flashes twice, the sensing device 100 as a whole is turned on, the pressure sensor 22 starts to monitor the pressure value, and the printed circuit board assembly 21 starts to process the monitoring data of the pressure sensor 22.

[0093] Please refer to Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , the sensing device 100 comprises a shell 10, a sensing module 20, a sensing module fixing member 30, and a shell sealing module 60.

[0094] The shell 10 comprises a first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 are sealed by a shell sealing ring 62.

[0095] The first shell 11 comprises a first accommodating portion 121, a second accommodating portion 122, and a third accommodating portion 123. The first accommodating portion 121, the second accommodating portion 122, and the third accommodating portion 123 can be integrally formed or separately formed. The first accommodating portion 121 is arranged away from the second shell 12. The second accommodating portion 122 and the third accommodating portion 123 are arranged close to the second shell 12, and the top of the second accommodating portion 122 and the third accommodating portion 123 and the bottom of the second shell 12 are sealed by the shell sealing ring 62.

[0096] The first accommodating portion 121 and the second accommodating portion 122 have a communication hole. The first accommodating portion 121 and the third accommodating portion 123 do not have a communication hole. The second accommodating portion 122 and the third accommodating portion 123 are arranged in parallel left and right in the Z direction. In the Z direction, the bottom of the second accommodating portion 122 and the third accommodating portion 123 can be arranged at the same height, and the top of the second accommodating portion 122 and the third accommodating portion 123 can also be arranged at the same height. The accommodating space of the second accommodating portion 122 is less than or equal to the accommodating space of the third accommodating portion 123.

[0097] In one embodiment, the sensing module fixing member 30 comprises a tee nut. The sensing module fixing member 30 comprises a common port 31, a normally open port 32, and a normally closed port 33. The common port 31 is located in the communication hole between the first accommodating portion 121 and the second accommodating portion 122. The first accommodating portion 121 is used to accommodate the normally open port 32 and the normally closed port 33 of the tee nut. The normally open port 32 and the normally closed port 33 are arranged to extend in the Y direction. In the Z direction, the normally open port 32 is located in the projection area of the third accommodating portion 123, and the normally closed port 33 is located in the projection area of the second accommodating portion 122. In use, the normally open port 32 is in communication with the internal cavity to be detected (the internal cavity of the pipeline to be monitored or the internal cavity of the fire extinguisher). The normally closed port 33 is sealed by a sealing member. The common port 31 is connected to the sensing module 20, and specifically, the common port 31 is connected to the pressure sensor 22. The first accommodating portion 121 and the sensing module fixing member 30 can be integrally formed. For example, the tee nut is placed in the first accommodating portion 121 when the first shell 11 is opened, and the first accommodating portion 121 and the tee nut are embedded together after molding.

[0098] In one embodiment, the second accommodating portion 122 and the third accommodating portion 123 can be separated by a partition 124. The partition 124 can also be used as a battery compartment isolation component. The inner side wall of the first shell 11 in the second accommodating portion 122 has a reinforcing rib 122a, and / or the side wall of the partition 124 in the second accommodating portion 122 has a reinforcing rib 122a. The reinforcing rib 122a can be provided with a groove to increase the friction when the second accommodating portion 122 is filled with the cured sealing body 61 (which can be epoxy resin). The inner side wall of the first shell 11 in the second accommodating portion 122 and / or the side wall of the partition 124 in the second accommodating portion 122 is provided with a height identification line 122b to mark the filling height of the cured sealing body 61.

[0099] The sensing module 20 comprises a printed circuit board assembly 21, a pressure sensor 22, a sensor sealing ring 23, a waterproof and breathable membrane 24, and a dust screen 25. The pressure sensor 22 is fixedly arranged on the first surface of the printed circuit board assembly 21 by welding. The sensor sealing ring 23 is sleeved on the outer side wall of the pressure sensor 22. The waterproof and breathable membrane 24 is attached to the edge of the air inlet of the pressure sensor 22. The dust screen 25 is laser welded on the edge of the pressure sensor 22, and the waterproof and breathable membrane 24 is pressed between the pressure sensor 22 and the dust screen 25, which can effectively prevent dust and water from entering the interior of the pressure sensor 22.

[0100] The temperature sensor 26 is arranged on the second surface of the printed circuit board assembly 21. The first surface of the printed circuit board assembly 21 is in contact with the inner bottom wall of the first shell 11. The pressure sensor 22, the sensor sealing ring 23, the waterproof and breathable film 24, and the dust screen 25 are exposed to the first accommodating portion 121 through the communication hole between the first accommodating portion 121 and the second accommodating portion 122. The sensing module fixing member 30 includes a common port 31, a normally open port 32, and a normally closed port 33. The common port 31 is located in the communication hole between the first accommodating portion 121 and the second accommodating portion 122. The pressure sensor 22, the sensor sealing ring 23, the waterproof and breathable film 24, and the dust screen 25 are located in the common port 31.

[0101] The shell sealing module 60 includes a shell sealing ring 62 and a solidified sealing body 61. The shell sealing ring 62 is arranged between the second shell 12 and the first shell 11 to achieve alignment sealing between the second shell 12 and the first shell 11. The solidified sealing body 61 is filled in the second accommodating portion 122. The height identification line 122b is used to prompt the filling height of the solidified sealing body 61. When the sensing device 100 is applied to the gas pressure of the collection pipeline / extinguisher, the pressure sensor 22 will have an upward thrust. Since the solidified sealing body 61 in the sensing device 100 has been solidified, the solidified sealing body 61 and the pressure sensor 22 become an integral whole, that is, the solidified sealing body 61 will be subjected to an upward thrust. The recesses on the reinforcing ribs 122a can effectively resist the upward thrust caused by the gas pressure, thereby improving the reliability of the product.

[0102] The sensing device 100 provided in the embodiment of the present application adopts the sensor sealing ring 23 and the solidified sealing body 61 for double-layer sealing between the inner cavity of the pipeline / extinguisher to be detected and the pressure sensor, and simultaneously encapsulates the printed circuit board assembly in the epoxy resin sealing glue, so that the reliability is high and the device airtightness can be guaranteed.

[0103] In one embodiment, the distance between the projection of the outer edge of the normally open port 32 in the Z direction and the projection of the center of the common port 31 in the Z direction is d1; the distance between the projection of the outer edge of the normally closed port 33 in the Z direction and the projection of the center of the common port 31 in the Z direction is d2; d1>d2 can be set to buffer the instantaneous pressure value when the sensing device 100 is installed to the pressure source to be detected. For example, d1:d2=5.5:4.5, 6:4, 6.5:3.5, 7:3, etc. When the value of d1:d2 is set, the design space of the power module 40 (such as the length, width, and height of the power supply battery 41, the installation positions of the positive battery piece 42 and the negative battery piece 43, etc.) should also be considered.

[0104] In this embodiment, the design of d1>d2 belongs to an asymmetric force arm structure, which mainly brings the following two levels of beneficial effects: On the one hand, it can optimize the internal stress distribution and improve the reliability of the pressure sensor 22 (sensing module 20): The normally open port 32 is the actual working interface connected to the high pressure source, and the fluid pressure will act on the cavity of the sensing module fixing part 30 through the normally open port 32, and finally be transmitted to the pressure sensor 22 and the solidified sealing body 61. Therefore, the normally open port 32 is a main stress point. By making d1>d2, it is equivalent to setting the main stress point (normally open port 32) in the Z direction to be farther away from the core common port 31 and the printed circuit board assembly 21, pressure sensor 22 and solidified sealing body 61 in the second accommodating part 122. The design of d1>d2 increases the force arm of the pressure load transmitted to the pressure sensor 22 and the solidified sealing body 61. According to the principle of mechanics, this helps to more evenly disperse the concentrated pressure to the entire sensing module fixing part 30 and the shell structure of the first accommodating part 121 of the first shell 11, rather than directly and closely impacting the pressure sensor mounting area. Reducing the local stress and potential micro-deformation risk of the pressure sensor 22 and its peripheral sealing structure due to direct high pressure impact improves the measurement accuracy and structural durability under long-term pressure cycling. On the other hand, it can improve the external connection pipeline layout and reduce the installation stress. The normally open port 32 is connected to the external high pressure pipeline. The external connection pipeline can be the application pipeline of the sensing device 100, such as a gas pipeline, a fire fighting pipeline, a fire extinguisher light path, etc. The pipeline needs to test the pressure value. d1 is larger, which means that the interface has more adequate axial space outside the device. This allows the external connection pipe joint or pipe to have a larger bending radius or more flexible space when installed, avoiding the need for the pipeline to make sharp turns due to limited space, thereby generating additional installation stress directly on the interface. The design of d1>d2 reduces the influence of external mechanical stress (such as lateral tension, bending moment) introduced by improper on-site installation on the internal core sensing and sealing module of the device, improving the robustness of the product in actual application.

[0105] In this embodiment, the design of d1>d2 is a strategy to optimize mechanical performance through spatial geometric layout. It cleverly guides the potential concentrated stress to the more solid shell structure to bear by pushing the high pressure input point away, while providing convenience for external connection, thereby enhancing the overall reliability of the device from both internal stress and external interference.

[0106] In one embodiment, the accommodation space of the second accommodating part 122 is less than or equal to the accommodation space of the third accommodating part 123.

[0107] In this embodiment, the accommodation space of the second accommodation part 122 is less than or equal to the accommodation space of the third accommodation part 123, which can achieve the beneficial effects 1: precise functional partition and space efficient use; and beneficial effects 2: enhanced structural rigidity and interference isolation.

[0108] Beneficial effect 1:

[0109] On the one hand, the second accommodation part 122, i.e. the area of the core sealing area, has a small area size: its size is precisely calculated to accommodate the sensing module 20 in the smallest but sufficient space and fill the necessary amount of solidified sealing body 61. The compact space can ensure that the solidified sealing body 61 forms a dense and bubble-free coating layer during pouring and solidification, reducing the risk of internal stress or shrinkage cracking caused by excessive or uneven colloid thickness.

[0110] On the other hand, the third accommodation part 123, i.e. the area of the extended functional area, has a large area size: it provides sufficient space for accommodating the battery with a larger volume. At the same time, this larger space can accommodate the branch of the three-way piece with a longer connecting channel (usually the extended distance between the normally open port 32 and the common port 31).

[0111] The synergistic effect of the two area sizes: the longer connecting channel on the sensing module fixing part 30 (three-way piece or T-shaped nut) can naturally extend and occupy part of the depth space of the third accommodation part 123. This allows the depth of the first accommodation part 121 not to be too deep to accommodate the long channel, thereby maintaining the overall miniaturization trend of the device. In other words, the large third accommodation part is not only prepared for the battery, but also provides design freedom for optimizing the internal flow structure of the sensing module fixing part 30 (three-way piece or T-shaped nut).

[0112] Beneficial effect 2:

[0113] On the one hand, the longer connecting channel itself acts as a structural reinforcement rib, which can enhance the overall rigidity of the sensing module fixing part 30 (three-way piece or T-shaped nut) and the area where it is located. Arranging this long channel in the relatively independent and spacious third accommodation part 123 projection area can better physically isolate it from the precise electronic components (sensing module 20 and its included components) and solidified sealing body 61 in the second accommodation part 122. This helps to reduce the interference of vibrations that may be transmitted through the housing due to fluid flow or pressure pulsation on the sensor signal.

[0114] On the other hand, separating the power module 40, which may generate heat or electromagnetic interference, from the sensing module 20 in two spaces also conforms to the principles of good electromagnetic compatibility and thermal design.

[0115] The second accommodating part 122 and the third accommodating part 123 are divided into one large space and one small space, which is not random, but precisely matched with the asymmetric flow channel (d1>d2) inside the sensing module fixing part 30 (three-way piece or T-shaped nut). This collaborative design achieves: 1. The core sealing area is compact and efficient; 2. The design space of the extended function power module 40 and the external connecting pipeline is sufficient; 3. The overall structure is rigidly enhanced; 4. The interference between different functional modules is minimized. It embodies the high-level design idea of considering space, structure and function as a whole.

[0116] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sensing device for monitoring pressure in a high-pressure environment, characterized in that, include: First shell (11); The sensing module (20) includes a printed circuit board assembly (21) and a pressure sensor (22) protruding from the printed circuit board assembly (21). The sensing module fixture (30) is provided with an interface for communicating with the pressure source to be measured; The first housing (11) includes: The first receiving part (121) is used to receive and fix the sensing module fixing member (30). The second receiving portion (122) is used to receive the printed circuit board assembly (21); and, The third receiving section (123) is arranged side by side with the second receiving section (122); The first receiving part (121) is disposed below the second receiving part (122) and the third receiving part (123), and a communication hole is provided between it and the second receiving part (122). The pressure sensor (22) is connected to the pressure channel of the sensing module fixing member (30) through the communication hole. The second receiving portion (122) is filled with a cured sealant (61), which encapsulates and fixes the printed circuit board assembly (21) within the second receiving portion (122); The third receiving portion (123) is formed by an integral molding process, so that the third receiving portion (123) is physically isolated from the first receiving portion (121) and the second receiving portion (122); The sensing module fixing part (30) is a three-way part, which includes a common port (31) that connects to the pressure sensor (22), a normally open port (32) for connecting to the pressure source to be measured, and a normally closed port (33) that is sealed. Wherein, the projection of the normally open (32) in the Z direction is located in the region of the third receiving part (123), and the projection of the normally closed (33) in the Z direction is located in the region of the second receiving part (122); The second receiving portion (122) and the third receiving portion (123) are separated by a partition (124); the third receiving portion (123) is not connected to the first receiving portion (121).

2. The sensing device according to claim 1, characterized in that, Protruding reinforcing ribs (122a) are provided on the inner wall of the first housing (11) in the second receiving part (122) and / or on the inner wall of the partition (124) in the second receiving part (122).

3. The sensing device according to claim 2, characterized in that, In the Z direction, the surface of the reinforcing rib (122a) is provided with at least one groove.

4. The sensing device according to claim 2, characterized in that, The partition (124) is provided with a height marking line (122b) for indicating the filling height of the cured sealant (61).

5. The sensing device according to claim 1, characterized in that, The third receiving portion (123) is used to receive the power supply battery (41).

6. The sensing device according to claim 1, characterized in that, The accommodating space of the second accommodating part (122) is less than or equal to the accommodating space of the third accommodating part (123).

7. The sensing device according to claim 1, characterized in that, The first receiving part (121) and the sensing module fixing part (30) are integrally formed by inlay injection molding.

8. The sensing device according to claim 1, characterized in that, The sensing module (20) also includes: The sensor sealing ring (23) is fitted onto the outside of the pressure sensor (22); A waterproof and breathable membrane (24) covers the air inlet of the pressure sensor (22); and, The dustproof net (25) is fixed to the pressure sensor (22) by laser welding and presses the waterproof and breathable membrane (24) together.

9. The sensing device according to claim 1, characterized in that, The sensing module (20) also includes: A temperature sensor (26) is disposed on the printed circuit board assembly (21) and is located on a different surface from the pressure sensor (22).

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