Optical fiber pressure sensor device

Abstract

The utility model discloses an optical fiber pressure sensor device which comprises a shell, a connecting pipe, an optical fiber sensor and a pressure guide packaging assembly, a first through hole and a second through hole which are communicated with each other are arranged in the shell, and two ends of the connecting pipe are respectively connected with a first clamping sealing assembly. One end of the connecting pipe sleeves the outer side of one end of the shell and is sealed and detachably and fixedly connected with the shell through a first clamping and sealing assembly, and the other end of the connecting pipe is sealed and detachably and fixedly connected with the optical fiber through the first clamping and sealing assembly; the pressure guide packaging assembly is sleeved on the outer side of the other end of the shell, and the pressure guide packaging assembly and the shell are sealed and detachably and fixedly connected through the second clamping sealing assembly. According to the utility model, the shell is matched with the connecting pipe and the pressure guide packaging assembly to wrap and seal the connecting part of the optical fiber and the optical fiber sensor; and meanwhile, the optical fiber sensor is packaged through the pressure guide packaging assembly without being interfered by external collision, so that the adaptability of the optical fiber sensor to a complex environment is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic sensing technology, and in particular to a fiber optic pressure sensor device. Background Technology

[0002] Fiber optic pressure sensors, as key components in industrial production, scientific research, and engineering monitoring, demonstrate significant advantages in applications requiring specialized environments. Compared to the limitations of traditional electrical pressure sensors in harsh environments such as strong electromagnetic interference, flammable and explosive conditions, high temperature and pressure, and long-distance monitoring, fiber optic pressure sensors, with their characteristics of electromagnetic interference resistance, intrinsic safety, corrosion resistance, high temperature resistance, small size, light weight, and suitability for networking and long-distance transmission, have become the ideal choice for these special scenarios.

[0003] Currently, fiber optic pressure sensors based on principles such as fiber Bragg gratings (FBG), Fabry-Perot (FP) interferometers, and microbending loss are widely used. However, the effectiveness of practical applications depends not only on the performance of the core sensing element but also on the packaging structure, fiber optic connection method, pressure-resistant sealing design, and overall mechanical strength. Existing fiber optic sensors still suffer from insufficient pressure resistance, difficulties in field packaging and connection, and low sealing reliability, which limits their application in specific scenarios such as deep sea and oil wells.

[0004] Therefore, there is an urgent need for a new fiber optic pressure sensor device to solve the above-mentioned technical problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problems that existing fiber optic sensors still have insufficient pressure resistance, difficulty in field packaging and connection, and low sealing reliability in structural design, which restricts their application in specific scenarios such as deep sea and oil wells.

[0006] To this end, the present invention provides an optical fiber pressure sensor device, comprising a housing, a connecting tube, an optical fiber sensor, and a pressure-conducting encapsulation assembly. The housing has a first through hole and a second through hole that are interconnected, and the diameter of the first through hole is smaller than the diameter of the second through hole. The optical fiber sensor is installed in the second through hole. The first through hole is used for the core wire of the optical fiber connected to the optical fiber sensor to pass through. The two ends of the connecting tube are respectively connected to a first snap-fit ​​sealing assembly. One end of the connecting tube is sleeved on the outside of one end of the housing and the two are sealed and detachably fixedly connected by the first snap-fit ​​sealing assembly. The connecting tube is used for the optical fiber to pass through. The other end of the connecting tube is sealed and detachably fixedly connected to the optical fiber by the first snap-fit ​​sealing assembly. The pressure-conducting encapsulation assembly is sleeved on the outside of the other end of the housing and the two are sealed and detachably fixedly connected by a second snap-fit ​​sealing assembly. The end of the optical fiber sensor extends into the pressure-conducting encapsulation assembly.

[0007] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, the pressure-conducting encapsulation assembly includes a pressure cylinder, an intermediate cylinder, and a locking sleeve. One end of the pressure cylinder is sleeved on one end of the intermediate cylinder and detachably fixedly connected thereto. The other end of the intermediate cylinder is sleeved on the locking sleeve and detachably fixedly connected thereto. The locking sleeve is sleeved on the other end of the outer shell, and the two are sealed and detachably fixedly connected by the second snap-fit ​​sealing assembly. The outer shell extends into the intermediate cylinder, and the detection end of the fiber optic pressure sensor extends into the pressure cylinder.

[0008] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, one end of the pressure cylinder is threadedly connected to one end of the intermediate cylinder, and the pressure cylinder and the intermediate cylinder are auxiliaryly fixed by a set screw, the center line of which is perpendicular to the center line of the pressure cylinder.

[0009] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, the ferrule kit includes a ferrule body. One end of the ferrule body is integrally formed with a first connecting end. The first connecting end is connected to a second snap-fit ​​sealing assembly to achieve a detachable, fixed, and sealed connection with the outer shell. The other end of the ferrule body is integrally formed with a second connecting end. The other end of the intermediate cylinder is sleeved on the second connecting end and threadedly connected to it. A sealing ring is provided between the ferrule body and the intermediate cylinder.

[0010] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, the end of the pressure cylinder away from the outer shell is closed, and multiple pressure guiding holes are provided on the outer wall of the pressure cylinder.

[0011] In a specific embodiment of the aforementioned fiber optic pressure sensor device, the first snap-fit ​​sealing assembly includes a nut, a first ferrule seat, and a second ferrule seat. The nut is fitted onto the end of the connecting tube and threadedly connected thereto. The first ferrule seat and the second ferrule seat are sequentially arranged between the nut and the end of the connecting tube along a direction away from the outer shell and are fitted onto the corresponding optical fiber or outer shell. When the nut and the end of the connecting tube are in a connected state, the second ferrule seat and the first ferrule seat are squeezed by the nut to achieve a tight seal with the corresponding connecting tube, optical fiber, or outer shell, and the connecting tube and the optical fiber or outer shell are detachably fixedly connected by the nut in a tight manner.

[0012] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, the first ferrule is a conical structure, and the first ferrule has a conical hole and a third through hole that are interconnected. The second ferrule is a cylindrical structure, and the second ferrule has a fourth through hole. One end of the outer wall of the second ferrule is set as a conical surface that mates with the conical hole. The inner wall of the end of the connecting tube is provided with a conical surface that mates with the conical surface of the first ferrule.

[0013] In a specific embodiment of the above-mentioned fiber optic pressure sensor device, the second snap-fit ​​sealing assembly has the same structure as the first snap-fit ​​sealing assembly. The nut in the second snap-fit ​​sealing assembly is threadedly connected to the first connecting end. The inner wall of the first connecting end is provided with a conical surface that mates with the conical surface of the first ferrule seat. When the nut and the first connecting end are in a connected state, the second ferrule seat and the first ferrule seat are squeezed together to achieve a seal with the corresponding first connecting end and the outer shell in a clamping manner. Under the cooperation of the nut, the first connecting end and the outer shell are detachably fixedly connected in a clamping manner.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model encapsulates and seals the connection between the optical fiber and the optical fiber sensor by setting up an outer shell and cooperating with a connecting tube and a pressure-conducting encapsulation assembly. At the same time, the pressure-conducting encapsulation assembly protects the optical fiber sensor from external collisions and interference, thus enhancing the adaptability of the optical fiber sensor to complex environments. In addition, because it is surrounded by the connecting tube, outer shell and pressure-conducting encapsulation assembly, the overall structure can withstand high external pressure, making it suitable for pressure measurement in high-pressure environments.

[0016] 2. The connection method using card kits and snap-fit ​​sealing components eliminates the need for complex tools, facilitating the access and fixation of optical fibers on site. This makes on-site encapsulation and connection simple and convenient. At the same time, the sealing is achieved through a compression clamping method, which improves the reliability of the seal and effectively prevents external fluids (liquid or gas) from entering the sensor, protecting the core sensitive components and optical fiber connection points.

[0017] 3. The entire device is divided into multiple modules for assembly. This modular component design makes the assembly and subsequent maintenance of the sensor simpler and more convenient. Attached Figure Description

[0018] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the overall structure of the fiber optic pressure sensor device provided by this utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the inner and outer shell structure;

[0021] Figure 3 yes Figure 1 Enlarged view of the structure of the first snap-fit ​​sealing assembly;

[0022] Figure 4 yes Figure 1 Enlarged view of the connection between the pressure-conducting packaging component and the housing.

[0023] List of reference numerals in the attached diagram:

[0024] 1. First snap-fit ​​sealing assembly; 101. Nut; 102. First ferrule seat; 103. Second ferrule seat; 104. Third through hole; 105. Fourth through hole; 2. Second snap-fit ​​sealing assembly; 3. Sealing ring; 4. Connecting pipe; 5. Housing; 501. Second through hole; 502. First through hole; 6. ferrule kit; 601. Ferrule body; 602. First connecting end; 603. Second connecting end; 7. Intermediate cylinder; 8. Set screw; 9. Fiber optic sensor; 10. Pressure cylinder; 11. Pressure guide hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the aforementioned components. Unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" 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.

[0028] This utility model relates to the field of fiber optic sensing technology, and in particular to a fiber optic pressure sensor device. The aim is to solve the problems of insufficient pressure resistance, difficulties in field packaging and connection, and low sealing reliability in existing fiber optic sensors, which limit their application in specific scenarios such as deep sea and oil wells. To this end, the present invention provides an optical fiber pressure sensor device, comprising a housing, a connecting tube, an optical fiber sensor, and a pressure-conducting encapsulation assembly. The housing has a first through-hole and a second through-hole that are interconnected, with the diameter of the first through-hole being smaller than the diameter of the second through-hole. The optical fiber sensor is installed in the second through-hole. The first through-hole is used to allow the core wire of the optical fiber connected to the optical fiber sensor to pass through. The two ends of the connecting tube are respectively connected to first snap-fit ​​sealing assemblies. One end of the connecting tube is sleeved on the outside of one end of the housing and the two are sealed and detachably fixed together by the first snap-fit ​​sealing assembly. The connecting tube is used to allow the optical fiber to pass through. The other end of the connecting tube is sealed and detachably fixed together with the optical fiber by the first snap-fit ​​sealing assembly. The pressure-conducting encapsulation assembly is sleeved on the outside of the other end of the housing and the two are sealed and detachably fixed together by the second snap-fit ​​sealing assembly. The end of the optical fiber sensor extends into the pressure-conducting encapsulation assembly. The present invention, by setting up a housing and cooperating with the connecting tube and the pressure-conducting encapsulation assembly to encapsulate and seal the connection between the optical fiber and the optical fiber sensor, and by encapsulating the optical fiber sensor with the pressure-conducting encapsulation assembly to prevent external collision interference, enhances the adaptability of the optical fiber sensor to complex environments.

[0029] The fiber optic pressure sensor device provided in the embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] See Figure 1-2 This utility model provides an optical fiber pressure sensor device, including a housing 5, a connecting tube 4, an optical fiber sensor 9, and a pressure-conducting encapsulation assembly. The housing 5 has a first through hole 502 and a second through hole 501 that are interconnected inside, and the diameter of the first through hole 502 is smaller than the diameter of the second through hole 501. The optical fiber sensor 9 is installed in the second through hole 501. The first through hole 502 is used for the core wire of the optical fiber connected to the optical fiber sensor 9 to pass through. The two ends of the connecting tube 4 are respectively connected to the first snap-fit ​​sealing assembly 1. One end of the connecting tube 4 is sleeved on the outside of one end of the housing 5 and the two are sealed and detachably fixedly connected by the first snap-fit ​​sealing assembly 1. The connecting tube 4 is used for the optical fiber to pass through. The other end of the connecting tube 4 is sealed and detachably fixedly connected to the inserted optical fiber by the first snap-fit ​​sealing assembly 1. The pressure-conducting encapsulation assembly is sleeved on the outside of the other end of the housing 5 and the two are sealed and detachably fixedly connected by the second snap-fit ​​sealing assembly 2. The end of the optical fiber sensor 9 extends into the pressure-conducting encapsulation assembly.

[0031] Specifically, a step is formed at the connection between the second through hole 501 and the first through hole 502. This step is used to support the fiber optic pressure sensor. The fiber optic pressure sensor is fixed in the second through hole 501 with glue, which seals the second through hole 501 and the first through hole 502, preventing external liquids or gases from entering the first through hole 502.

[0032] In one embodiment, see Figure 1 and Figure 4 The pressure-conducting encapsulation assembly includes a pressure cylinder 10, an intermediate cylinder 7, and a card kit 6. One end of the pressure cylinder 10 is fitted onto one end of the intermediate cylinder 7 and is detachably and fixedly connected thereto. The other end of the intermediate cylinder 7 is fitted onto the card kit 6 and is detachably and fixedly connected thereto. The card kit 6 is fitted onto the other end of the outer shell 5 and the two are sealed and detachably fixedly connected by a second snap-fit ​​sealing assembly 2. The outer shell 5 extends into the intermediate cylinder 7, and the detection end of the fiber optic pressure sensor extends into the pressure cylinder 10.

[0033] In the above embodiment, preferably, one end of the pressure cylinder 10 is threaded to one end of the intermediate cylinder 7, and the pressure cylinder 10 and the intermediate cylinder 7 are auxiliaryly fixed by a set screw 8, the center line of the set screw 8 being perpendicular to the center line of the pressure cylinder 10.

[0034] Specifically, the end of the pressure cylinder 10 furthest from the outer casing 5 is closed. Multiple pressure-guiding holes 11 are provided on the outer wall of the pressure cylinder 10. External pressure is transmitted into the pressure cylinder 10 through these holes 11 and then acts on the fiber optic sensor 9. A threaded hole is provided at the connection point between the pressure cylinder 10 and the intermediate cylinder 7. The threaded hole extends from the outer wall of the pressure cylinder 10 to the intermediate cylinder 7. A set screw 8 is threaded into the threaded hole to secure the intermediate cylinder 7 and the pressure cylinder 10.

[0035] In this application, the pressure cylinder 10 constitutes the external pressure-resistant housing of the fiber optic sensor 9, bearing external pressure and impacts to prevent damage to the fiber optic sensor 9. The outer shell 5, together with the connecting tube 4 and the clamping kit 6, encapsulates and seals the connection between the optical fiber and the fiber optic sensor 9. Simultaneously, the pressure cylinder 10 encapsulates the fiber optic sensor 9, protecting it from external impacts and interference, thus enhancing the adaptability of the fiber optic sensor 9 to complex environments. Furthermore, the overall structure, surrounded by the connecting tube 4, the outer shell 5, and the pressure-conducting encapsulation assembly, can withstand high external pressures, making it suitable for pressure measurement in high-pressure environments.

[0036] In the above embodiments, preferably, see [reference needed]. Figure 4 The card kit 6 includes a card sleeve body 601. One end of the card sleeve body 601 is integrally formed with a first connecting end 602. The first connecting end 602 is connected to the second snap-fit ​​sealing assembly 2 to achieve a detachable fixed sealing connection with the outer shell 5. The other end of the card sleeve body 601 is integrally formed with a second connecting end 603. The other end of the intermediate cylinder 7 is sleeved on the second connecting end 603 and threadedly connected to it. A sealing ring 3 is provided between the card sleeve body 601 and the intermediate cylinder 7.

[0037] Specifically, the end face of the intermediate cylinder 7 used to connect with the card sleeve 6 is provided with an annular groove. When the second connecting end 603 is connected to the intermediate cylinder 7, one end of the card sleeve body 601 is located in the annular groove and the sealing between the card sleeve body 601 and the intermediate cylinder 7 is achieved by squeezing the sealing ring 3.

[0038] In the above embodiment, the card kit 6, intermediate cylinder 7 and pressure cylinder 10 are designed as a detachable structure, and the three are independent of each other. One of them can be replaced at will without affecting the other components, making it more flexible to use and helping to reduce manufacturing costs.

[0039] In one embodiment, see Figure 1 and Figure 3The first snap-fit ​​sealing assembly 1 includes a nut 101, a first ferrule seat 102, and a second ferrule seat 103. The nut 101 is fitted onto the end of the connecting tube 4 and threadedly connected thereto. The first ferrule seat 102 and the second ferrule seat 103 are sequentially arranged between the nut 101 and the end of the connecting tube 4 along a direction away from the outer shell 5 and fitted onto the corresponding optical fiber or outer shell 5. When the nut 101 and the end of the connecting tube 4 are in a connected state, the second ferrule seat 103 and the first ferrule seat 102 are squeezed by the nut 101 to achieve a tight seal with the corresponding connecting tube 4, optical fiber, or outer shell 5, and the connecting tube 4 and the optical fiber or outer shell 5 are detachably fixedly connected by the nut 101 in a tight manner.

[0040] Specifically, such as Figure 1 As shown, one end of the connecting tube 4 is fitted onto the outer casing 5. During the connection process between the nut 101 and the connecting tube 4, the nut 101 at this location compresses the first retaining sleeve 102 and the second retaining sleeve 103. This compression causes deformation, thereby achieving a tight seal with the outer casing 5 and the inner wall of the connecting tube 4, and locking the outer casing 5 in place. The optical fiber is inserted into the connecting tube 4 from the other end. The first retaining sleeve 102 and the second retaining sleeve 103 at the other end of the connecting tube 4 are compressed due to the connection between the nut 101 and the connecting tube 4, thus achieving a tight seal with the optical fiber and the inner wall of the connecting tube 4, and locking the optical fiber within the connecting tube 4.

[0041] In the above embodiments, preferably, the first ferrule seat 102 has a conical structure, and a conical hole and a third through hole 104 are provided inside the first ferrule seat 102. The second ferrule seat 103 has a cylindrical structure, and a fourth through hole 105 is provided on the second ferrule seat 103. One end of the outer wall surface of the second ferrule seat 103 is set as a conical surface that mates with the conical hole. The inner wall of the end of the connecting pipe 4 is provided with a conical surface that mates with the conical surface of the first ferrule seat 102. The nut 101 has a stepped hole inside, which not only realizes the connection between the nut 101 and the connecting pipe 4, but also allows the nut 101 to press against the second ferrule seat 103. Figure 2 As shown, the left end of the connecting tube 4 is used as an example for explanation. During the connection process, the nut 101 moves closer to the connecting tube 4, thereby squeezing the second ferrule seat 103. The second ferrule seat 103, squeezed by the nut 101, then squeezes the first ferrule seat 102. The first ferrule seat 102 deforms under pressure, achieving a tight seal between itself and the conical surface of the connecting tube 4 and the outer surface of the optical fiber. The deformation of the first ferrule seat 102 generates a clamping force on the optical fiber, thus fixing the optical fiber to the connecting tube 4. When the nut 101 is in the connected state, one end of the nut 101 abuts against the second ferrule seat 103, and both the second ferrule seat 103 and the first ferrule seat 102 are under compression.

[0042] In one embodiment, see Figure 4 The second snap-fit ​​sealing assembly 2 has the same structure as the first snap-fit ​​sealing assembly 1. The nut 101 in the second snap-fit ​​sealing assembly 2 is threadedly connected to the first connecting end 602. The inner wall of the first connecting end 602 is provided with a conical surface that mates with the conical surface of the first sleeve seat 102. When the nut 101 and the first connecting end 602 are in the connected state, the second sleeve seat 103 and the first sleeve seat 102 are squeezed together to achieve a seal with the corresponding first connecting end 602 and the outer shell 5 in a clamping manner. Under the cooperation of the nut 101, the first connecting end 602 and the outer shell 5 are detachably fixedly connected in a clamping manner.

[0043] The connection method using card kits and snap-fit ​​sealing components eliminates the need for complex tools, facilitating the access and fixation of optical fibers in the field. This makes the field encapsulation connection simple and convenient. At the same time, the sealing method of compression and clamping improves the reliability of the seal and can effectively prevent external fluids (liquid or gas) from entering the sensor, protecting the core sensitive components and optical fiber connection points.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fiber optic pressure sensor device, characterized in that, The device includes a housing, a connecting tube, an optical fiber sensor, and a pressure-conducting encapsulation assembly. The housing has a first through hole and a second through hole that are interconnected, with the diameter of the first through hole being smaller than the diameter of the second through hole. The optical fiber sensor is installed in the second through hole, and the core wire of the optical fiber connected to the optical fiber sensor passes through the first through hole. The two ends of the connecting tube are respectively connected to a first snap-fit ​​sealing assembly. One end of the connecting tube is sleeved on the outside of one end of the housing and the two are sealed and detachably fixedly connected by the first snap-fit ​​sealing assembly. The optical fiber passes through the connecting tube, and the other end of the connecting tube is sealed and detachably fixedly connected to the optical fiber by the first snap-fit ​​sealing assembly. The pressure-conducting encapsulation assembly is sleeved on the outside of the other end of the housing and the two are sealed and detachably fixedly connected by a second snap-fit ​​sealing assembly. The end of the optical fiber sensor extends into the pressure-conducting encapsulation assembly.

2. The fiber optic pressure sensor device according to claim 1, characterized in that, The pressure-conducting encapsulation assembly includes a pressure cylinder, an intermediate cylinder, and a locking device. One end of the pressure cylinder is fitted onto one end of the intermediate cylinder and is detachably and fixedly connected thereto. The other end of the intermediate cylinder is fitted onto the locking device and is detachably and fixedly connected thereto. The locking device is fitted onto the other end of the outer shell and the two are sealed and detachably fixedly connected by the second snap-fit ​​sealing assembly. The outer shell extends into the intermediate cylinder, and the detection end of the fiber optic pressure sensor extends into the pressure cylinder.

3. The fiber optic pressure sensor device according to claim 2, characterized in that, One end of the pressure cylinder is threaded to one end of the intermediate cylinder, and the pressure cylinder and the intermediate cylinder are further fixed by a set screw, the center line of which is perpendicular to the center line of the pressure cylinder.

4. The fiber optic pressure sensor device according to claim 2, characterized in that, The card set includes a card sleeve body, one end of which is integrally formed with a first connecting end. The first connecting end is connected to a second snap-fit ​​sealing component to achieve a detachable, fixed, and sealed connection with the outer shell. The other end of the card sleeve body is integrally formed with a second connecting end. The other end of the intermediate cylinder is sleeved on the second connecting end and threadedly connected to it. A sealing ring is provided between the card sleeve body and the intermediate cylinder.

5. The fiber optic pressure sensor device according to claim 2, characterized in that, The end of the pressure cylinder away from the outer shell is closed, and multiple pressure guiding holes are provided on the outer wall of the pressure cylinder.

6. The fiber optic pressure sensor device according to claim 1, characterized in that, The first snap-fit ​​sealing assembly includes a nut, a first ferrule seat, and a second ferrule seat. The nut is fitted onto the end of the connecting tube and threaded thereto. The first ferrule seat and the second ferrule seat are sequentially arranged between the nut and the end of the connecting tube along the direction away from the outer shell and are fitted onto the corresponding optical fiber or outer shell. When the nut and the end of the connecting tube are in the connected state, the second ferrule seat and the first ferrule seat are squeezed by the nut to achieve a tight seal with the corresponding connecting tube, optical fiber, or outer shell, and the connecting tube and the optical fiber or outer shell are detachably fixedly connected by the nut in a tight manner.

7. The fiber optic pressure sensor device according to claim 6, characterized in that, The first ferrule holder is a conical structure, and has a conical hole and a third through hole that are interconnected inside. The second ferrule holder is a cylindrical structure, and has a fourth through hole. One end of the outer wall of the second ferrule holder is set as a conical surface that mates with the conical hole. The inner wall of the end of the connecting pipe is provided with a conical surface that mates with the conical surface of the first ferrule holder.

8. The fiber optic pressure sensor device according to claim 7, characterized in that, The second snap-fit ​​sealing assembly has the same structure as the first snap-fit ​​sealing assembly. The nut in the second snap-fit ​​sealing assembly is threadedly connected to the first connecting end. The inner wall of the first connecting end is provided with a conical surface that mates with the conical surface of the first ferrule seat. When the nut and the first connecting end are in the connected state, the second ferrule seat and the first ferrule seat are squeezed together to achieve a seal with the corresponding first connecting end and the outer shell in a clamping manner. Under the cooperation of the nut, the first connecting end and the outer shell are detachably fixedly connected in a clamping manner.

Images