Sealed temperature sensor probe structure

Abstract

The utility model discloses a sealed temperature sensor probe structure, comprising a protective housing, the inner side of the protective housing is provided with an accommodating groove, the middle area of the inner side of the accommodating groove is fixedly welded with an inner shell, the inner side of the inner shell is movably inserted with a temperature sensor, one side of the temperature sensor close to the upper part is provided with a limiting groove, and the limiting groove is provided with a through hole. A connecting seat is fixedly connected to the inner side of the limiting groove, a spring folding rod is hinged to the side face of the connecting seat, a limiting plate is hinged to the side face of the spring folding rod, and a pressing groove is formed in the side wall of the inner side, close to the upper portion, of the inner shell; a dynamic adjusting mechanism of the spring folding rod linkage limiting plate can adapt to deformation or vibration interference of the outer shell, close contact between the temperature sensing element and the inner shell is always kept, and measurement errors caused by physical displacement are avoided.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor equipment technology, specifically a sealed temperature sensor probe structure. Background Technology

[0002] Temperature sensor probes are the front-end components of temperature detection systems. They directly contact or approach the medium being measured through built-in sensitive elements, converting temperature changes into measurable electrical signals (such as changes in resistance, voltage, or frequency). Their structure typically includes a temperature sensing element, a protective housing, and signal transmission leads, used to achieve accurate and stable temperature monitoring and data transmission in complex environments.

[0003] The shortcomings of some existing temperature sensor probe structures are that the external single-layer shell lacks a dynamic buffering mechanism for the internal temperature sensing element. Under severe vibration or sudden temperature changes, the material deformation can easily lead to poor contact between the temperature sensing element and the shell, causing the measurement signal to drift or lag. Their sealing design often relies on a single static sealing layer (such as potting or welding). During long-term use, the sealing material is prone to aging and developing micro-cracks, allowing moisture or corrosive media to enter and damage the sensitive element. The lead wire interface usually adopts a rigid fixing method, which can easily cause stress concentration and cracking at the seal when the cable is bent. Utility Model Content

[0004] As a further embodiment of this utility model: a protective shell, wherein an inner cavity is provided on the inner side of the protective shell, an inner shell is fixedly welded to the middle area of ​​the inner cavity, a temperature sensor is movably inserted into the inner shell, a limit groove is provided on the upper side of the temperature sensor, a connecting seat is fixedly connected to the inner side of the limit groove, a spring folding rod is hinged to the side of the connecting seat, a limit plate is hinged to the side of the spring folding rod, and a pressure groove is provided on the inner side wall of the inner shell near the upper inner side.

[0005] As a further embodiment of this utility model: a lead wire conduit is fixedly connected above the temperature sensor, the lead wire conduit extends through the top cover plate of the protective housing, a lead wire is fixedly inserted above the lead wire conduit, a sealing ring is fixedly snapped at the interface between the lead wire conduit and the top cover plate of the protective housing, and a corrugated rubber sleeve is fixedly fitted at the interface between the lead wire conduit and the lead wire.

[0006] As a further improvement of this utility model: the filling port of the upper cover plate of the protective shell is movably connected to a sealing filling cap, and a heat-conducting head is fixedly welded to the bottom of the protective shell.

[0007] As a further embodiment of this utility model: the receiving groove between the inner side of the protective outer shell and the inner shell is used to fill the sealing adhesive, the size of the pressure groove matches the size of the limiting plate, and the limiting plate is used to restrict the movement of the temperature sensor within the inner shell.

[0008] As a further improvement of this utility model: the lead wire passes through the lead wire conduit and is fixedly connected to the terminal above the temperature sensor; the corrugated rubber sleeve can elastically deform according to the folding of the lead wire; and the interface between the lead wire conduit and the lead wire and the upper cover plate of the outer shell is sealed with solder.

[0009] As a further improvement of this utility model, the sealing injection cap is detachable and used to fill the receiving groove with sealing adhesive.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The dynamic adjustment mechanism of the spring folding rod linkage limit plate can adapt to the deformation of the outer shell or vibration interference, always maintaining close contact between the temperature sensing element and the inner shell, and avoiding measurement errors caused by physical displacement.

[0012] The double-layer flexible sealing structure of the lead conduit and corrugated rubber sleeve allows the cable to bend and adjust in complex installation environments while completely isolating the risk of external liquid or gas penetration. Combined with the convenient maintenance features of the removable filling cap, it significantly extends the service life of the probe under humid, corrosive or high vibration conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the protective shell in this utility model;

[0015] Figure 3 This is a schematic diagram of the structure above the protective outer shell in this utility model;

[0016] Figure 4 This is a schematic diagram of the temperature sensor limiting mechanism in this utility model;

[0017] Figure 5 This is a schematic diagram of the limiting plate in this utility model.

[0018] In the diagram: 1. Protective outer shell; 2. Inner shell; 3. Receiving groove; 4. Temperature sensor; 5. Limiting groove; 6. Connecting seat; 7. Spring folding rod; 8. Limiting plate; 9. Pressing groove; 10. Lead wire conduit; 11. Lead wire; 12. Sealing ring; 13. Corrugated rubber sleeve; 14. Sealing injection cap; 15. Heat conduction head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" 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. The embodiments of this utility model will be described below based on its overall structure.

[0021] Reference Figures 1 to 5 In this embodiment of the present invention, a sealed temperature sensor probe structure includes: a protective shell 1, which is made of stainless steel and is in the shape of a hollow cylinder, with a copper heat-conducting head 15 welded to the bottom for direct contact with the object being measured and rapid heat conduction; an annular receiving groove 3 is machined on the inner side of the protective shell 1; the middle area of ​​the receiving groove 3 is fixedly connected to an inner shell 2 made of nickel alloy by argon arc welding; the inner diameter of the inner shell 2 is slightly larger than the outer diameter of the temperature sensor 4, so that the temperature sensor 4 can be axially inserted into the inner shell 2.

[0022] The temperature sensor 4 uses a platinum resistance thermometer as the sensitive element. It has a terminal block on its top and is fixedly connected to the lead wire 11 by silver solder. A U-shaped limiting groove 5 is opened on the side wall of the temperature sensor 4 near the top. An aluminum alloy connecting seat 6 is welded in the limiting groove 5. Two sets of symmetrically distributed spring folding rods 7 are hinged to the side of the connecting seat 6 by a pin. The other end of the spring folding rod 7 is hinged to an arc-shaped limiting plate 8. The curvature of the limiting plate 8 matches the inner wall of the inner shell 2. The inner wall of the inner shell 2 near the top is machined with a pressure groove 9. The depth of the pressure groove 9 is the same as the thickness of the limiting plate 8, so that the limiting plate 8 can be embedded in the pressure groove 9 under the elastic action of the spring folding rod 7, thereby limiting the axial displacement of the temperature sensor 4 in the inner shell 2.

[0023] The lead 11 of the temperature sensor 4 extends outward through the lead conduit 10. The lower end of the lead conduit 10 is fixed to the top of the temperature sensor 4 with epoxy resin, and the upper end passes through the cover plate on the top of the protective housing 1 and extends to the outside. A silicone sealing ring 12 is press-fitted between the lead conduit 10 and the through hole of the cover plate of the protective housing 1. The outer edge of the sealing ring 12 is sealed and fixed to the cover plate by laser welding. A corrugated rubber sleeve 13 is fitted at the interface between the lead conduit 10 and the lead 11. The inner wall of the corrugated rubber sleeve 13 is coated with conductive glue and fits tightly with the lead 11. Its corrugated structure allows the lead 11 to undergo elastic deformation when bent, preventing sealing failure. All gaps between the lead conduit 10 and the cover plate and the lead 11 are sealed by soldering.

[0024] High-temperature resistant silicone is injected into the receiving groove 3 between the protective outer shell 1 and the inner shell 2 as a sealant. Before filling, the silicone is injected through the injection port reserved at the top of the protective outer shell 1. The injection port is threadedly connected to a detachable sealing injection cap 14. A rubber gasket is provided on the inner side of the sealing injection cap 14. After tightening, an airtight seal is formed. When the sealant shrinks due to aging, the detachable sealing injection cap 14 is used to replenish the silicone, ensuring that the receiving groove 3 is full of silicone and isolating the intrusion of external media.

[0025] The working principle of this utility model is as follows:

[0026] When the temperature of the object being measured changes, heat is transferred to the interior of the protective housing 1 through the heat-conducting head 15 welded to the bottom. Since the inner shell 2 is in direct contact with the temperature sensor 4, the heat is further conducted along the inner shell 2 to the sensitive element of the temperature sensor 4, causing its resistance or voltage signal to change accordingly. The electrical signal generated by the temperature sensor 4 is transmitted outward through the lead wire 11 and the lead wire conduit 10. The sealing ring 12 and the corrugated rubber sleeve 13 between the lead wire conduit 10 and the protective housing 1 work together to prevent external liquids or gases from seeping into the probe along the lead wire 11.

[0027] During long-term use, the sealant filling the receiving groove 3 between the protective outer shell 1 and the inner shell 2 forms a double isolation layer, which can buffer the impact of mechanical vibration on the temperature sensor 4 and block the intrusion of external corrosive media. When the probe is subjected to external pressure or drastic temperature fluctuations, the spring folding rod 7 drives the limiting plate 8 to move slightly in the pressure groove 9 through the hinge action, so that the temperature sensor 4 maintains stable contact in the inner shell 2 and avoids measurement deviation caused by deformation.

[0028] Throughout the process, the elastic deformation capability of the corrugated rubber sleeve 13 allows the lead wire 11 to bend within a certain range without damaging the seal.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealed temperature sensor probe structure, characterized by, Include: The protective shell (1), the accommodating groove (3) is set up in the inside of the protective shell (1), the inside of the accommodating groove (3) is fixedly welded with the inner shell (2) in the middle area, the inside of the inner shell (2) is movably inserted with the temperature sensor (4), the temperature sensor (4) is set up with the limiting groove (5) near the upper side, the limiting groove (5) is fixedly connected with the connecting seat (6) in the inside, the connecting seat (6) side is hinged with the spring folding rod (7), the spring folding rod (7) side is hinged with the limiting plate (8), the inner shell (2) is set up with the pressure groove (9) in the side wall of the upper inside.

2. A sealed temperature sensor probe structure according to claim 1, wherein The lead guide pipe (10) is fixedly connected with the lead (11) above the lead guide pipe (10), the lead guide pipe (10) extends out through the upper cover plate of the protective shell (1), the lead guide pipe (10) and the upper cover plate of the protective shell (1) are fixedly connected with the sealing ring (12) at the interface, the lead guide pipe (10) and the lead (11) are fixedly connected with the corrugated rubber sleeve (13) at the interface.

3. A sealed temperature sensor probe structure according to claim 2, wherein, The sealing injection cover (14) is movably inserted in the injection port of the upper cover plate of the protective shell (1), the heat conduction head (15) is fixedly welded at the bottom of the protective shell (1).

4. A sealed temperature sensor probe structure according to claim 1, wherein The accommodating groove (3) between the inside of the protective shell (1) and the inner shell (2) is used to fill the sealing glue, the size of the pressure groove (9) matches the size of the limiting plate (8), and the limiting plate (8) is used to limit the movement of the temperature sensor (4) in the inner shell (2).

5. A sealed temperature sensor probe structure according to claim 2, wherein The lead (11) is fixedly connected with the wiring end above the temperature sensor (4) through the lead guide pipe (10), the corrugated rubber sleeve (13) can be elastically deformed according to the folding of the lead (11), and the interfaces between the lead guide pipe (10), the lead (11) and the upper cover plate of the protective shell (1) are sealed by soldering tin.

6. A sealed temperature sensor probe structure according to claim 3, wherein The sealing injection cover (14) can be detached for filling the sealing glue in the accommodating groove (3).

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