A new type of explosion-proof temperature sensor

Abstract

This utility model discloses a novel explosion-proof temperature sensor, comprising a housing connected to a cover, a lead wire sleeve and a mounting connector on the housing, a temperature transmission module inside the housing, and a high-temperature conductor outside the housing. One end of the high-temperature conductor is connected to a platinum resistance thermometer, and the other end extends into the housing through the mounting connector and connects to the temperature transmission module. An explosion-proof sheath is provided on the outside of the high-temperature conductor and the platinum resistance thermometer. A threaded connection is provided on the inner wall of the lead wire sleeve, and a stuffing box is screwed into the threaded connection. A sealing ring is provided between the stuffing box and the bottom of the threaded connection, and an annular gasket is provided between the sealing ring and the bottom of the stuffing box. An O-ring is provided between the stuffing box and the upper end of the threaded connection. This utility model achieves a seal on the lead wire sleeve by using an O-ring, a sealing ring, and a stuffing box, thereby improving the sealing effect, reducing the impact of external factors on the internal structure of the housing, and improving the explosion-proof performance.

Description

Technical Field

[0001] This utility model relates to the field of temperature measurement equipment technology, specifically a novel explosion-proof temperature sensor. Background Technology

[0002] A common type of explosion-proof temperature sensor is shown in Chinese Utility Model Patent Application No. 201220045942.8, which discloses an explosion-proof thermometer. It improves the explosion-proof performance of the thermometer by setting an explosion-proof sleeve. However, in its junction box structure, i.e., housing structure, the connection part that communicates with the outside is only screwed on by a threaded part to achieve a seal inside the junction box. In the above-mentioned sealing structure, the sealing effect is limited when the lead wire passes through the threaded part. The weakened sealing effect may lead to the impact of external explosion on internal components, indicating room for improvement. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing a novel explosion-proof temperature sensor that improves the sealing and explosion-proof effect at the lead wire sleeve.

[0004] To achieve the above objectives, this utility model provides a novel explosion-proof temperature sensor, which adopts the following technical solution:

[0005] A novel explosion-proof temperature sensor includes a housing with a cover. The housing has a lead wire sleeve and a mounting connector. A temperature transmitter module is located inside the housing. A high-temperature conductor is located outside the housing; one end of the high-temperature conductor is connected to a platinum resistance thermometer, and the other end extends into the housing through the mounting connector and connects to the temperature transmitter module. An explosion-proof sheath is provided outside the high-temperature conductor and the platinum resistance thermometer. The explosion-proof sheath has a mounting connector. A threaded connection is provided on the inner wall of the lead wire sleeve. A stuffing box is screwed into the threaded connection. A sealing ring is provided between the stuffing box and the bottom of the threaded connection. An annular gasket is provided between the sealing ring and the bottom of the stuffing box. An O-ring is provided between the stuffing box and the upper end of the threaded connection.

[0006] A further improvement of this novel explosion-proof temperature sensor is that the stuffing box includes a T-shaped fixed column with a fixed groove running through its top and bottom. The fixed column includes a horizontal part and a vertical part, and O-rings are arranged at the bends of the horizontal and vertical parts.

[0007] A further improvement of this novel explosion-proof temperature sensor is that a groove is formed on the inner side of the upper end face of the threaded connection, and the O-ring is placed in the groove.

[0008] A further improvement of this novel explosion-proof temperature sensor is that the inner diameter of the fixing groove is larger than the inner diameter of the gasket and the inner diameter of the sealing ring.

[0009] A further improvement of this novel explosion-proof temperature sensor is that the upper end of the sealing ring has a protrusion, and the lower end of the gasket has an upward-facing concave portion, wherein the protrusion engages with the concave portion.

[0010] A further improvement of this novel explosion-proof temperature sensor is that a positioning groove is provided on the inner side of the lower part of the threaded connection, and the sealing ring includes a positioning part placed in the positioning groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention achieves a seal on the lead wire sleeve by setting an O-ring and a sealing ring at the lead wire sleeve and using a stuffing box, thereby improving the sealing effect, reducing the impact of external factors on the internal structure of the housing, and improving the explosion-proof performance. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the diagram: 1. Housing, 2. Housing cover, 3. Temperature transmitter module, 4. Mounting component connection, 5. High-temperature wire, 6. Platinum resistance thermometer, 7. Explosion-proof sleeve, 8. Mounting part, 9. Lead wire sleeve, 10. Sealing ring, 11. Gasket, 12. Stuffing gland, 13. O-ring, 14. Positioning groove, 15. Groove. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual proportions. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, a novel explosion-proof temperature sensor includes a housing 1, a housing cover 2 connected to the housing, a lead wire sleeve 9 and a mounting connector 4 on the housing, a temperature transmitter module 3 inside the housing, and a high-temperature conductor 5 outside the housing. One end of the high-temperature conductor is connected to a platinum resistance thermometer 6, and the other end extends into the housing through the mounting connector and is connected to the temperature transmitter module. An explosion-proof sheath 7 is provided outside the high-temperature conductor and the platinum resistance thermometer, and a mounting part 8 is provided on the explosion-proof sheath. The above structure is one of the existing structures of explosion-proof temperature sensors. Furthermore, a threaded connection part is provided on the inner wall of the lead wire sleeve, and a stuffing box 12 is screwed to the threaded connection part. A sealing ring 10 is provided between the stuffing box and the bottom of the threaded connection part, and an annular gasket 11 is provided between the sealing ring and the bottom of the stuffing box. An O-ring 13 is provided between the stuffing box and the upper end of the threaded connection part.

[0021] Specifically, the stuffing box includes a T-shaped fixed post with a through-groove running vertically through it. The fixed post comprises a horizontal section and a vertical section, with an O-ring positioned at the bend between the horizontal and vertical sections. The outer side of the vertical section has threads that connect to a threaded connection. A groove 15 is formed on the inner side of the upper end face of the threaded connection, and the O-ring is placed within this groove. The groove improves the stability of the O-ring arrangement and enhances the sealing effect of the stuffing box at the upper bend.

[0022] The inner diameter of the fixing groove is larger than the inner diameter of the gasket and the inner diameter of the sealing ring. The stuffing box ensures stability when pressed down against the gasket and sealing ring.

[0023] Furthermore, a protrusion can be added to the upper end of the sealing ring, and a concave portion is provided on the lower end of the gasket facing upwards, with the protrusion engaging with the concave portion. A positioning groove 14 is provided on the lower inner side of the threaded connection, and the sealing ring includes a positioning portion placed within the positioning groove. This further ensures the stability of the sealing ring's arrangement. The stuffing box structure is made of explosion-proof material.

[0024] The working principle of this utility model is as follows: When the lead wire is laid at the lead wire sleeve, the lead wire passes through the sealing ring, gasket, and stuffing box. At this time, the stuffing box is connected to the threaded connection and pressed down, pressing the gasket and sealing ring, so that the sealing ring and the lead wire are squeezed together, improving the sealing performance; the O-ring is provided to further improve the sealing performance, thereby preventing the internal structure of the shell from being easily affected by external explosions, and improving the explosion-proof performance.

[0025] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A novel explosion-proof temperature sensor, comprising a housing, a cover connected to the housing, a lead wire sleeve and a mounting connector on the housing, a temperature transmitter module inside the housing, and a high-temperature conductor outside the housing. One end of the high-temperature conductor is connected to a platinum resistance thermometer, and the other end extends into the housing through the mounting connector and is connected to the temperature transmitter module. An explosion-proof sheath is provided outside the high-temperature conductor and the platinum resistance thermometer, and the explosion-proof sheath has a mounting portion. The sensor is characterized in that... The inner wall of the lead wire sleeve is provided with a threaded connection part, and a stuffing box is screwed into the threaded connection part. A sealing ring is provided between the stuffing box and the bottom of the threaded connection part. An annular gasket is provided between the sealing ring and the bottom of the stuffing box. An O-ring is provided between the stuffing box and the upper end of the threaded connection part.

2. A new explosion-proof temperature sensor according to claim 1, characterized in that, The stuffing box includes a T-shaped fixed column with a fixed groove running through it from top to bottom. The fixed column includes a horizontal part and a vertical part, and O-rings are arranged at the bends of the horizontal and vertical parts.

3. A new explosion-proof temperature sensor according to claim 2, characterized in that, The upper end face of the threaded connection has a groove facing downwards, and the O-ring is placed in the groove.

4. A new explosion-proof temperature sensor according to claim 3, characterized in that, The inner diameter of the fixing groove is larger than the inner diameter of the gasket and the inner diameter of the sealing ring.

5. A novel explosion-proof temperature sensor according to claim 4, characterized in that, The sealing ring has a protruding part at its upper end, and the gasket has a concave part at its lower end facing upwards, with the protruding part fitting into the concave part.

6. A new explosion-proof temperature sensor according to claim 5, characterized in that, The threaded connection part has a positioning groove on the lower inner side facing outward, and the sealing ring includes a positioning part placed in the positioning groove.

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