A temperature drift preventing needle type pressure sensor

Abstract

The utility model discloses a kind of anti-temperature needle type pressure sensor, including shell, the inside laminated installation of shell has core body, compression ring and sealing part, the outer wall of compression ring is connected to the outer wall of shell with interference, and its bottom is tightly in the top of core body, so that the bottom of core body is compressed in the corresponding place of shell, the outer wall of sealing part is tightly combined in the inside of shell, and bottom is tightly in the top of compression ring, to realize the further fixed limit of compression ring after installation.The precision medium transmission channel of flow guide port, annular groove, flow guide hole and through hole composition, cooperate the reasonable installation layout of core body, ensure that the medium to be detected is stably, uniformly act on detection area, reduce the error and interference in pressure transmission process.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor application technology, and in particular to a temperature-resistant needle-type pressure sensor. Background Technology

[0002] Pressure sensors, as key detection components in industrial production and electronic equipment, primarily function to convert medium pressure signals into identifiable electrical signals, providing data support for equipment operation monitoring and control. With the expansion of application scenarios, sensors often need to operate in environments with significant temperature fluctuations, leading to increasingly higher requirements for measurement accuracy and environmental adaptability.

[0003] Traditional pressure sensors suffer from structural design flaws. On the one hand, the internal components, such as the core and pressure ring, lack installation stability and are prone to loosening due to thermal expansion and contraction during temperature changes, leading to a shift in the detection reference. On the other hand, their sealing performance is poor, allowing external moisture and impurities to easily penetrate the interior. Furthermore, frequent heat exchange between the interior and the outside environment exacerbates temperature drift, resulting in significant deviations in the detection data. Additionally, the core components are susceptible to corrosion and damage, shortening their service life and making it difficult to meet the requirements for high-precision pressure detection. Therefore, this invention proposes a temperature-drift-resistant needle-type pressure sensor. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a temperature-drift-resistant needle-type pressure sensor to solve the problems of significant temperature drift, poor installation stability and insufficient sealing performance of traditional pressure sensors, thereby improving the measurement accuracy and service life of the sensor.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a temperature-resistant needle-type pressure sensor is provided, including a housing, in which a core, a pressure ring and a sealing part are stacked and installed in layers. The outer wall of the pressure ring is interference-fitted to the outer wall of the housing, and its bottom is pressed against the top of the core, so that the bottom of the core is pressed against the corresponding part of the housing. The outer wall of the sealing part is tightly fitted to the inside of the housing, and the bottom is pressed against the top of the pressure ring to further fix and limit the pressure ring after installation.

[0006] The present invention is further configured such that: the interior of the housing is provided with an installation cavity adapted to the core, the core is detachably installed inside the installation cavity, and the detection area of ​​the core is provided with a detection end facing one end of the housing.

[0007] Through the above technical solutions, the mounting cavity provides a precise installation and positioning space for the core, ensuring the positional stability of the core after installation and avoiding detection errors caused by installation offset; the design of the detection area facing the detection end allows the medium to be detected to act directly on the detection area, shortening the medium transmission path and reducing energy loss and temperature influence during transmission. At the same time, the detachable installation facilitates the maintenance and replacement of the core, improving the practicality of the sensor.

[0008] The present invention is further configured such that: a fixing cavity is provided on the housing corresponding to the installation position of the pressure ring, the inner diameter of the fixing cavity is adapted to the outer diameter of the connecting surface opened on the outer wall of the pressure ring, and an adaptation groove is symmetrically provided on the top of the pressure ring.

[0009] Through the above technical solution, the size of the fixed cavity and the connecting surface are matched, providing radial positioning for the pressure ring. Combined with the interference fit between the pressure ring and the housing, the installation firmness of the pressure ring is further improved. The symmetrically arranged adaptation grooves can provide a certain deformation space during the installation of the pressure ring, which facilitates the smooth assembly of the pressure ring into the fixed cavity. At the same time, it can alleviate the thermal stress between the pressure ring and the housing when the temperature changes, avoid the loosening of the connection due to thermal expansion and contraction, and indirectly reduce the impact of temperature drift.

[0010] The present invention is further configured such that: a sealing cavity is provided on the housing corresponding to the installation position of the sealing part, the inner wall of the sealing cavity is provided with sealing texture, and the outer wall of the sealing part fits in close contact with the sealing texture to realize the sealing connection between the sealing part and the housing.

[0011] Through the above technical solution, the sealing cavity provides a dedicated installation space for the sealing part, and the sealing texture increases the contact area and friction between the sealing part and the inner wall of the housing, making the sealing part fit the housing more tightly. This effectively prevents external moisture, dust and other impurities from entering the sensor, avoiding contamination or corrosion of core components such as the core. At the same time, the good sealing performance can reduce the heat exchange between the inside and the outside, reduce the impact of ambient temperature fluctuations on the working state of the core, and thus suppress temperature drift.

[0012] The present invention is further configured such that: a flow guide port is provided on the end face of the detection end, an annular groove is provided inside the flow guide port, a flow guide hole is provided at the bottom of the annular groove, and a through hole is provided at the connection center between the detection end and the housing.

[0013] Through the above technical solution, the guide port guides the medium to be tested into the test area, the annular groove buffers and distributes the medium evenly, avoiding direct impact of the medium on the test area and preventing sudden changes in local pressure, thus improving the stability of the test. The guide hole is used to accurately guide the medium in the annular groove to the through hole, which provides a channel for the medium to reach the test area. The coordinated design of each component ensures smooth and stable medium transmission and reduces the test error caused by unstable medium flow.

[0014] The present invention is further configured such that: the detection end is connected to the interior of the shell through a guide port, an annular groove, a guide hole and a through hole connected in sequence, and is also connected to the detection area.

[0015] Through the above technical solution, a complete medium transmission channel is formed from the detection end to the detection area, ensuring that the medium to be detected can act on the detection area accurately and stably, so that the core can accurately sense the medium pressure. This connection structure can reduce leakage and interference of the medium during transmission, ensure the authenticity and reliability of the detection signal, and simplify the medium transmission path, reduce the temperature conduction delay caused by the complexity of the path, and help improve the temperature adaptability of the sensor.

[0016] The present invention is further configured such that the annular groove and the through hole are located on the same axis.

[0017] With the above technical solution, the annular groove and the through hole are set coaxially, which allows the medium in the annular groove to be evenly distributed to each guide hole. Even if the guide hole and the through hole are not coaxial, the flow deviation can be avoided. At the same time, the through hole is precisely aligned with the center of the detection area, and the medium acts perpendicularly on the detection area, reducing eddies and energy loss and improving detection accuracy.

[0018] The beneficial effects of this utility model are as follows: 1. The temperature drift-proof needle-type pressure sensor proposed in this utility model uses a stacked installation structure to fix the core, pressure ring and sealing part in sequence inside the housing. The interference fit of the pressure ring and the tight fit of the sealing part ensure the installation stability of each component and the overall sealing performance, effectively blocking external environmental interference, reducing the impact of temperature fluctuations on the core, thereby significantly suppressing the temperature drift phenomenon and improving the measurement accuracy of the sensor. 2. The temperature-resistant pressure sensor proposed in this utility model uses a precise medium transmission channel composed of a flow guide port, annular groove, flow guide hole and through hole, combined with the reasonable installation layout of the core, to ensure that the medium to be detected acts stably and uniformly on the detection area, reducing errors and interference in the pressure transmission process; at the same time, the structural design of each component fully considers temperature adaptability, alleviates the influence of thermal stress, extends the service life of the sensor, and has good practicality and reliability. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a temperature-resistant, drift-type pressure sensor according to this utility model; Figure 2 This is an exploded view of a temperature-resistant, drift-type pressure sensor according to this utility model. Figure 3 This is a front view of a temperature-resistant, drift-type pressure sensor according to this utility model. Figure 4This is a cross-sectional view of a temperature-resistant, drift-type pressure sensor according to this utility model. Figure 5 This is a cross-sectional view of the housing in a temperature-resistant, drift-type pressure sensor according to this utility model. Figure 6 This is a structural diagram of the pressure ring in a temperature-resistant, drift-type pressure sensor according to this utility model.

[0020] In the diagram: 1. Housing; 11. Mounting cavity; 12. Fixing cavity; 13. Sealing cavity; 14. Detection end; 15. Flow guide port; 16. Annular groove; 17. Flow guide hole; 18. Through hole; 2. Core; 21. Detection area; 22. Connecting wire harness; 3. Pressure ring; 31. Connecting surface; 32. Adaptive groove; 4. Sealing part. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0022] like Figures 1-4 As shown, a temperature-resistant, drift-type pressure sensor includes a housing 1. Inside the housing 1, a core 2, a pressure ring 3, and a sealing part 4 are stacked. The outer wall of the pressure ring 3 is interference-fitted to the outer wall of the housing 1, and its bottom abuts against the top of the core 2, so that the bottom of the core 2 is pressed against the corresponding part of the housing 1. The outer wall of the sealing part 4 is tightly fitted to the inside of the housing 1, and its bottom abuts against the top of the pressure ring 3, so as to further fix and limit the pressure ring 3 after installation.

[0023] like Figure 4 and Figure 5 As shown, the housing 1 has an internal mounting cavity 11 that fits the core 2. The core 2 can be detachably installed inside the mounting cavity 11, and the detection area 21 of the core 2 faces the detection end 14 located at one end of the housing 1. The mounting cavity 11 provides a precise installation and positioning space for the core 2, ensuring the positional stability of the core 2 after installation and avoiding detection errors caused by installation offset. The design of the detection area 21 facing the detection end 14 allows the medium to be detected to act directly on the detection area 21, shortening the medium transmission path and reducing energy loss and temperature influence during transmission. At the same time, the detachable installation facilitates the maintenance and replacement of the core 2, improving the practicality of the sensor.

[0024] like Figures 4-6As shown, a fixing cavity 12 is provided on the housing 1 corresponding to the installation position of the pressure ring 3. The inner diameter of the fixing cavity 12 is adapted to the outer diameter of the connecting surface 31 on the outer wall of the pressure ring 3. A symmetrical adaptation groove 32 is provided on the top of the pressure ring 3. The size of the fixing cavity 12 and the connecting surface 31 are adapted to provide radial positioning for the pressure ring 3. Combined with the interference fit between the pressure ring 3 and the housing 1, the installation firmness of the pressure ring 3 is further improved. The symmetrically arranged adaptation groove 32 can provide a certain deformation space when the pressure ring 3 is installed, which makes it easy for the pressure ring 3 to be smoothly assembled into the fixing cavity 12. At the same time, it can alleviate the thermal stress between the pressure ring 3 and the housing 1 when the temperature changes, avoid the connection loosening due to thermal expansion and contraction, and indirectly reduce the impact of temperature drift.

[0025] like Figure 4 and Figure 5 As shown, a sealing cavity 13 is provided on the housing 1 at the installation position corresponding to the sealing part 4. The inner wall of the sealing cavity 13 is provided with sealing patterns. The outer wall of the sealing part 4 fits snugly with the sealing patterns to achieve a sealed connection between the sealing part 4 and the housing 1. The sealing cavity 13 provides a dedicated installation space for the sealing part 4. The sealing patterns increase the contact area and friction between the sealing part 4 and the inner wall of the housing 1, making the sealing part 4 fit more tightly with the housing 1. This effectively prevents external moisture, dust and other impurities from entering the sensor, avoiding contamination or corrosion of core components such as the core 2. At the same time, the good sealing performance can reduce the heat exchange between the inside and the outside, reduce the impact of ambient temperature fluctuations on the working state of the core 2, and thus suppress temperature drift.

[0026] like Figure 5 As shown, the end face of the detection end 14 is provided with a guide port 15, the inside of the guide port 15 is provided with an annular groove 16, the bottom of the annular groove 16 is provided with a guide hole 17, and a through hole 18 is provided at the connection center between the detection end 14 and the housing 1. The guide port 15 serves to guide the medium to be tested into the housing. The annular groove 16 can buffer and distribute the medium evenly, avoiding the medium from directly impacting the detection area 21 and causing local pressure changes, thus improving the detection stability. The guide hole 17 is used to accurately guide the medium in the annular groove 16 to the through hole 18. The through hole 18 provides a channel for the medium to reach the detection area 21. The cooperative design of each component ensures smooth and stable medium transmission and reduces detection errors caused by unstable medium flow.

[0027] like Figure 4 and Figure 5As shown, the detection end 14 communicates with the interior of the housing 1 through a sequentially connected guide port 15, an annular groove 16, a guide hole 17, and a through hole 18, and is also connected to the detection area 21, forming a complete medium transmission channel from the detection end 14 to the detection area 21. This ensures that the medium to be detected can act accurately and stably on the detection area 21, enabling the core 2 to accurately sense the medium pressure. This connection structure can reduce leakage and interference of the medium during transmission, ensure the authenticity and reliability of the detection signal, and simplify the medium transmission path, reducing the temperature conduction delay caused by the complexity of the path, which helps to improve the temperature adaptability of the sensor. The annular groove 16 and the through hole 18 are located on the same axis. The coaxial arrangement of the annular groove 16 and the through hole 18 allows the medium in the annular groove 16 to be evenly distributed to each guide hole 17. Even if the guide hole 17 and the through hole 18 are not on the same axis, it can avoid flow deviation. At the same time, it makes the through hole 18 precisely correspond to the center of the detection area 21, and the medium acts perpendicularly on the detection area 21, reducing eddy currents and energy loss and improving detection accuracy.

[0028] When this utility model is in use, the medium to be tested enters through the guide port 15 of the detection end 14, is buffered and evenly distributed by the annular groove 16, and flows into the through hole 18 through the guide hole 17, and finally acts precisely on the detection area 21 of the core 2; the core 2 converts the pressure signal into an electrical signal, which is transmitted to the external device through the connecting wire harness 22 to complete the pressure detection.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A temperature-resistant, drift-proof pressure sensor, comprising a housing (1), characterized in that: The shell (1) is internally stacked with a core (2), a pressure ring (3) and a sealing part (4). The outer wall of the pressure ring (3) is interference-fitted to the outer wall of the shell (1), and its bottom is pressed against the top of the core (2), so that the bottom of the core (2) is pressed against the corresponding part of the shell (1). The outer wall of the sealing part (4) is tightly fitted to the inside of the housing (1), and the bottom is pressed against the top of the pressure ring (3) to further fix and limit the pressure ring (3) after installation.

2. The temperature-resistant needle-type pressure sensor according to claim 1, characterized in that: The housing (1) has an installation cavity (11) that is adapted to the core (2). The core (2) is detachably installed inside the installation cavity (11), and the detection area (21) of the core (2) is a detection end (14) facing the end of the housing (1).

3. The temperature-resistant needle-type pressure sensor according to claim 2, characterized in that: A fixing cavity (12) is provided on the housing (1) at the installation position of the pressure ring (3). The inner diameter of the fixing cavity (12) is adapted to the outer diameter of the connecting surface (31) opened on the outer wall of the pressure ring (3). An adaptation groove (32) is symmetrically opened on the top of the pressure ring (3).

4. A temperature-resistant, drift-proof needle-type pressure sensor according to claim 3, characterized in that: A sealing cavity (13) is provided on the housing (1) at the installation position of the sealing part (4). The inner wall of the sealing cavity (13) is provided with sealing patterns. The outer wall of the sealing part (4) fits the sealing patterns to achieve a sealed connection between the sealing part (4) and the housing (1).

5. A temperature-resistant, drift-proof needle-type pressure sensor according to claim 4, characterized in that: The end face of the detection end (14) is provided with a flow guide (15), the inside of the flow guide (15) is provided with an annular groove (16), the bottom of the annular groove (16) is provided with a flow guide hole (17), and a through hole (18) is provided at the connection center between the detection end (14) and the housing (1).

6. A temperature-resistant, drift-proof pressure sensor according to claim 5, characterized in that: The detection end (14) is connected to the interior of the shell (1) through the sequentially connected guide port (15), annular groove (16), guide hole (17) and through hole (18), and is also connected to the detection area (21).

7. A temperature-resistant, drift-proof pressure sensor according to claim 6, characterized in that: The annular groove (16) and the through hole (18) are located on the same axis.

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