A pressure sensor with corrosion resistance

Abstract

This utility model discloses a pressure sensor with anti-corrosion function, including a housing. An oil cup, a core, and a clamping ring are sequentially stacked on the inner bottom of the housing. Silicone oil is filled between the sealed oil cup and the core, and the clamping ring secures the oil cup and core to the inner bottom of the housing. This allows external liquid to exert pressure on the core through the oil cup and the internal silicone oil, preventing direct contact between the external liquid and the core, thus avoiding corrosion damage. An end cap is threaded to the top of the housing to provide a sealed protection for the interior, preventing external liquid from entering. This utility model, through the isolation structure design of the oil cup and silicone oil, utilizes the polytetrafluoroethylene (PTFE) oil cup to resist external corrosive liquids, while the silicone oil enables indirect pressure transmission, completely avoiding direct contact between external liquid and the core. This effectively solves the core corrosion problem and significantly extends the sensor's service life.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor application technology, and in particular to a pressure sensor with anti-corrosion function. Background Technology

[0002] In fields such as industrial production, chemical testing, and environmental monitoring, pressure sensors often need to come into contact with corrosive liquid media, such as acid and alkali solutions and chemical reagents.

[0003] Traditional pressure sensor cores are often in direct contact with external liquids, making them susceptible to corrosion and damage. This can lead to decreased measurement accuracy, shortened lifespan, and even equipment failure and safety hazards. In addition, the sealing structure of traditional sensors is not well designed, allowing external liquids to easily seep into the housing and further damage internal components, making it difficult to meet the requirements for stable operation in corrosive environments over a long period of time.

[0004] Therefore, this invention proposes a pressure sensor with corrosion resistance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a pressure sensor with anti-corrosion function. Through optimized structural design, the core is effectively protected, avoiding direct contact between external corrosive liquids and the core. At the same time, the sealing performance of the housing is enhanced, the service life of the sensor is extended, and the measurement accuracy and stability in corrosive environments are ensured.

[0006] To solve the above-mentioned technical problems, the present invention provides a pressure sensor with anti-corrosion function, including a housing. An oil cup, a core, and a clamping ring are stacked sequentially on the inner bottom of the housing. Silicone oil is filled between the sealed oil cup and the core, so that the clamping ring can fix the oil cup and the core to the inner bottom of the housing. This allows external liquid to exert pressure on the core through the oil cup and the internal silicone oil, preventing external liquid from directly contacting the core and causing corrosion damage. The top of the housing is threaded with an end cap to achieve a sealed protection of the inside of the housing and prevent external liquids from entering the housing.

[0007] The present invention is further configured such that: a monitoring end is fixedly connected to one end of the housing away from the end cap, and a channel is opened inside the monitoring end, and the channel communicates with the interior of the housing.

[0008] Through the above technical solution, the monitoring end, as the contact end between the sensor and the external corrosive liquid, provides a stable flow path for the external liquid through its internal channels, allowing the liquid to smoothly enter the housing and act on the oil cup; at the same time, the fixed connection structure between the monitoring end and the housing ensures the overall structural strength, avoids deformation or leakage at the connection due to excessive liquid pressure, and lays the foundation for subsequent pressure transmission and core protection.

[0009] The present invention is further configured such that: an annular ladder is fixedly provided at the inner bottom edge of the shell, the edge of the oil cup is provided at the top of the ladder, a protrusion is provided in the middle of the cup that fits tightly against the inner bottom of the shell, and an oil storage tank for storing silicone oil is provided in the protrusion.

[0010] Through the above technical solution, the annular ladder platform plays a role in positioning and supporting the oil cup, which can accurately limit the installation position of the oil cup at the bottom of the shell and avoid the oil cup from shifting due to force, thus affecting the pressure transmission accuracy. The protrusion in the middle of the oil cup fits tightly with the bottom of the shell, which can prevent silicone oil from leaking from the gap between the oil cup and the shell. The oil storage tank provides a stable storage space for silicone oil, ensuring that silicone oil can be evenly filled between the oil cup and the core, achieving efficient and uniform pressure transmission, while further isolating the contact between external liquid and the core.

[0011] The present invention is further configured such that the oil cup is made of polytetrafluoroethylene.

[0012] Through the above technical solutions, polytetrafluoroethylene (PTFE) material has excellent corrosion resistance, which can resist the erosion of most corrosive liquids such as acids, alkalis, and organic solvents, preventing the oil cup itself from being corroded and damaged by external liquids, and ensuring its long-term stable protective performance. At the same time, the material also has good flexibility and sealing properties, which can form a tight fit with the core and shell, reducing the risk of silicone oil leakage. Moreover, its physical properties are stable and it is not easily deformed during long-term use, which can ensure the accuracy of pressure transmission.

[0013] The present invention is further configured such that: an installation groove is provided on the inner wall of the housing near the top position, and the outer wall of the end cap is threadedly connected to the inside of the installation groove.

[0014] Through the above technical solution, the mounting groove provides precise installation positioning for the connection between the end cover and the housing. The threaded connection structure not only facilitates the disassembly and assembly of the end cover and the inspection and maintenance of the internal components of the sensor, but also enhances the sealing performance of the top of the housing through the tight fit of the threads. This effectively prevents external liquids, dust and other impurities from entering the interior from the top of the housing, avoiding contamination or corrosion of components such as the core and wiring harness, and further improving the overall protection effect of the sensor.

[0015] The present invention is further configured such that: the core is electrically connected to a wire harness, and the wire harness passes through a wire hole opened at the top center of the end cap, and is sealed to the inner wall of the wire hole.

[0016] Through the above technical solution, the wire hole provides a reasonable passage for the wire harness of the core to pass through, ensuring that the wire harness can be smoothly connected to external devices to realize signal transmission; the sealing setting between the wire harness and the inner wall of the wire hole can prevent external liquid or moisture from seeping into the housing through the gap between the wire hole and the wire harness, avoiding circuit failure due to moisture or corrosion at the connection between the core and the wire harness, ensuring the stability and reliability of sensor signal transmission, and also maintaining the sealed environment inside the housing.

[0017] The present invention is further configured such that: a large air hole is symmetrically opened at the top of the end cap near the outer arc wall, an annular groove is opened at the top of the outer wall of the end cap, and through holes are symmetrically opened inside the annular groove, and the two large air holes are respectively connected to the two through holes.

[0018] Through the above technical solution, the large air vent and the through hole form a connected airflow channel, which can keep the air pressure inside the housing balanced with the external atmospheric pressure. When the sensor is in an environment with temperature changes or pressure fluctuations, the air inside the housing expands when heated or contracts when cooled. This airflow channel can regulate the internal air pressure, avoiding excessively high or low internal air pressure that could lead to end cap sealing failure, oil cup deformation, or even core damage, thereby ensuring the stability of the overall sensor structure and measurement accuracy. At the same time, the ring groove can protect the through hole, reducing the risk of external impurities directly blocking the through hole and ensuring the unobstructed flow of the airflow channel.

[0019] The beneficial effects of this utility model are as follows: 1. The pressure sensor with anti-corrosion function proposed in this utility model adopts the isolation structure design of oil cup and silicone oil. The oil cup made of polytetrafluoroethylene resists the erosion of external corrosive liquids, while the pressure is indirectly transmitted by silicone oil. This completely avoids direct contact between external liquids and the core, effectively solves the core problem of easy corrosion of the core, and significantly extends the service life of the sensor. 2. The pressure sensor with anti-corrosion function proposed in this utility model forms a comprehensive sealing and air pressure regulation system through the threaded sealing connection between the housing and the end cap, the sealing fit between the wire harness and the wire hole, and the air pressure balance design of the large air hole and the through hole. This system not only prevents the infiltration of external impurities and liquids, but also avoids the impact of internal air pressure fluctuations on structural stability, ensuring that the sensor maintains high-precision pressure measurement performance for a long time in corrosive environments. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a pressure sensor with anti-corrosion function according to the present invention; Figure 2 This is a cross-sectional view of a pressure sensor with anti-corrosion function according to the present invention. Figure 3 This is a cross-sectional view of the housing of a pressure sensor with anti-corrosion function according to this utility model; Figure 4 This is a structural diagram of the oil cup in a pressure sensor with anti-corrosion function according to this utility model; Figure 5 This is a cross-sectional view of the end cap of a pressure sensor with anti-corrosion function according to this utility model.

[0021] In the diagram: 1. Housing; 11. Monitoring end; 111. Channel; 12. Ladder platform; 13. Mounting groove; 2. Oil cup; 3. Core; 4. Clamping ring; 5. End cap; 51. Wire hole; 52. Large air hole; 53. Ring groove; 54. Through hole. Detailed Implementation

[0022] 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.

[0023] like Figures 1-3 As shown, a pressure sensor with anti-corrosion function includes a housing 1. An oil cup 2, a core 3 and a clamping ring 4 are stacked sequentially on the inner bottom of the housing 1. Silicone oil is filled between the oil cup 2 and the core 3, which are connected in a sealed manner. The clamping ring 4, which is threaded inside the housing 1, fixes the oil cup 2 and the core 3 to the inner bottom of the housing 1. This allows external liquid to exert pressure on the core 3 through the oil cup 2 and the internal silicone oil, preventing external liquid from directly contacting the core 3 and causing corrosion damage. A monitoring end 11 is fixedly connected to the end of the housing 1 away from the end cap 5. The monitoring end 11 has a channel 111 inside, and the channel 111 is connected to the inside of the housing 1. The monitoring end 11 serves as the contact end between the sensor and the external corrosive liquid. The channel 111 inside can provide a stable flow path for the external liquid, allowing the liquid to smoothly enter the inside of the housing 1 and act on the oil cup 2. At the same time, the fixed connection structure between the monitoring end 11 and the housing 1 ensures the overall structural strength and avoids deformation or leakage at the connection due to excessive liquid pressure, laying the foundation for subsequent pressure transmission and core protection. An annular step 12 is fixedly installed at the inner bottom edge of the housing 1. The edge of the oil cup 2 is located at the top of the step 12. A protrusion is provided in the middle of the protrusion, which fits tightly against the inner bottom of the housing 1. An oil storage tank for storing silicone oil is provided in the protrusion. The annular step 12 plays a role in positioning and supporting the oil cup 2, which can accurately limit the installation position of the oil cup 2 in the inner bottom of the housing 1 and prevent the pressure transmission accuracy from being affected by the displacement of the oil cup 2 due to force. The protrusion in the middle of the oil cup 2 fits tightly against the inner bottom of the housing 1, which can prevent silicone oil from leaking from the gap between the oil cup 2 and the housing 1. The oil storage tank provides a stable storage space for silicone oil, ensuring that silicone oil can be evenly filled between the oil cup 2 and the core 3, realizing efficient and uniform pressure transmission, while further isolating the contact between external liquid and the core 3.

[0024] like Figure 2 and Figure 4 As shown, the oil cup 2 is made of polytetrafluoroethylene (PTFE). PTFE has excellent corrosion resistance and can resist the erosion of most corrosive liquids such as acids, alkalis, and organic solvents, preventing the oil cup 2 itself from being corroded and damaged by external liquids and ensuring its long-term stable protective performance. At the same time, this material also has good flexibility and sealing properties, which can form a tight fit with the core 3 and the shell 1, reducing the risk of silicone oil leakage. Moreover, its physical properties are stable and it is not easily deformed during long-term use, which can ensure the accuracy of pressure transmission.

[0025] like Figure 2 and Figure 3 As shown, the top of the housing 1 is threadedly connected to an end cap 5 to achieve a sealed protection for the interior of the housing 1, preventing external liquids from entering the interior of the housing 1. An installation groove 13 is provided on the inner wall of the housing 1 near the top. The outer wall of the end cap 5 is threadedly connected to the interior of the installation groove 13. The installation groove 13 provides a precise installation positioning for the connection between the end cap 5 and the housing 1. The threaded connection structure not only facilitates the disassembly and assembly of the end cap 5 and the inspection and maintenance of the internal components of the sensor, but also enhances the sealing performance of the top of the housing 1 through the tight fit of the threads. It effectively prevents external liquids, dust and other impurities from entering the interior from the top of the housing 1, preventing the core 3, wire harness and other components from being contaminated or corroded, and further improving the overall protection effect of the sensor.

[0026] like Figure 2 good Figure 5As shown, the core 3 is electrically connected to a wire harness, and the wire harness passes through a wire hole 51 opened at the top center of the end cover 5, and is sealed to the inner wall of the wire hole 51. The wire hole 51 provides a reasonable passage for the wire harness of the core 3 to pass through, ensuring that the wire harness can be smoothly connected to external devices to realize signal transmission. The sealing between the wire harness and the inner wall of the wire hole 51 can prevent external liquids or moisture from seeping into the interior of the housing 1 through the gap between the wire hole 51 and the wire harness, avoiding circuit failures at the connection between the core 3 and the wire harness due to moisture or corrosion, ensuring the stability and reliability of sensor signal transmission, and also maintaining the sealed environment inside the housing 1. The top of the end cap 5 is symmetrically provided with large air holes 52 near the outer arc wall. The outer wall of the end cap 5 is provided with an annular groove 53 near the top, and through holes 54 are symmetrically provided inside the annular groove 53. The two large air holes 52 are respectively connected to the two through holes 54, forming a connected airflow channel, which can keep the air pressure inside the housing 1 balanced with the external atmospheric pressure. When the sensor is in an environment with temperature changes or pressure fluctuations, the air inside the housing 1 expands when heated or contracts when cooled. This airflow channel can regulate the internal air pressure, avoiding excessively high or low internal air pressure that could cause the end cap 5 to fail to seal, the oil cup 2 to deform, or even the core 3 to be damaged, thereby ensuring the stability and measurement accuracy of the overall sensor structure. At the same time, the annular groove 53 can protect the through holes 54, reducing the risk of external impurities directly blocking the through holes 54 and ensuring the smooth flow of airflow.

[0027] In use, external corrosive liquid enters the housing 1 through the channel 111 of the monitoring end 11 and acts on the oil cup 2. The oil cup 2 transmits the pressure to the internal silicone oil, which then evenly transmits the pressure to the core 3. The core 3 converts the pressure signal into an electrical signal, which is transmitted to the external device through the wiring harness. During this process, the oil cup 2 and the silicone oil isolate the liquid from direct contact with the core 3. The polytetrafluoroethylene oil cup 2 resists liquid corrosion. The annular step 12 ensures the stability of the oil cup 2. The threaded seal between the end cap 5 and the housing 1, as well as the seal between the wiring harness and the wire hole 51, prevent liquid from seeping in. The large air hole 52 and the through hole 54 balance the air pressure inside and outside the housing 1, ensuring the stable operation of the sensor.

[0028] 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 pressure sensor with anticorrosion function, comprising a housing (1), characterized in that: The inner bottom of the housing (1) is provided with an oil cup (2), a core (3) and a clamping ring (4) stacked in sequence. The space between the oil cup (2) and the core (3) which are sealed together is filled with silicone oil. The clamping ring (4) which is threaded inside the housing (1) fixes the oil cup (2) and the core (3) to the inner bottom of the housing (1). This allows the external liquid to exert pressure on the core (3) through the oil cup (2) and the silicone oil inside, thus preventing the external liquid from directly contacting the core (3) and causing corrosion damage. The top of the housing (1) is threaded with an end cap (5) to achieve a sealed protection of the inside of the housing (1) and prevent external liquid from entering the inside of the housing (1).

2. The pressure sensor with anti-corrosion function according to claim 1, characterized in that: The end of the housing (1) away from the end cap (5) is fixedly connected to a monitoring end (11). The monitoring end (11) has a channel (111) inside, and the channel (111) is connected to the inside of the housing (1).

3. The pressure sensor with anti-corrosion function according to claim 1, characterized in that: An annular platform (12) is fixedly provided at the inner bottom edge of the housing (1), and the edge of the oil cup (2) is provided at the top of the platform (12). A protrusion is provided in the middle of the cup, which is closely attached to the inner bottom of the housing (1), and an oil storage tank for storing silicone oil is provided in the protrusion.

4. The pressure sensor with anti-corrosion function according to claim 3, characterized in that: The oil cup (2) is made of polytetrafluoroethylene.

5. The pressure sensor with anti-corrosion function according to claim 1, characterized in that: The inner wall of the housing (1) is provided with an installation groove (13) near the top, and the outer wall of the end cap (5) is threaded to the inside of the installation groove (13).

6. The pressure sensor with anticorrosion function according to claim 5, characterized in that: The core (3) is electrically connected to a wire harness, and the wire harness passes through a wire hole (51) opened at the top center of the end cap (5), and is sealed to the inner wall of the wire hole (51).

7. The pressure sensor with anticorrosion function according to claim 6, characterized in that: The end cap (5) has symmetrically provided large air holes (52) near the outer arc wall at the top. The outer wall of the end cap (5) has an annular groove (53) near the top. A through hole (54) is symmetrically provided inside the annular groove (53). The two large air holes (52) are respectively connected to the two through holes (54).

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