A vacuum-tight thermocouple junction box sealing device

Abstract

The utility model provides a vacuum sealed thermocouple junction box place sealing device belongs to temperature measurement technical field, this vacuum sealed thermocouple junction box place sealing device, including junction box sealing seat, the circumference surface fixedly connected with threaded connector of junction box sealing seat, rotatably connected with screw twist in threaded connector, the circumference surface screw joint has the lid of junction box sealing seat, the first spring is pushed after compressing and pushes the first dampproof sealing plug and compresses junction box body top, cooperate the plastic sealing ring and sealing ring of junction box sealing seat inner wall, form first way plane sealing barrier, prevent gas from the gap of lid and sealing seat and invade, second spring drive second dampproof sealing plug and card into junction box body inside, tightly wrap thermocouple wire, combine the thread fastening of threaded connector and screw twist, form second way three -dimensional sealing structure, prevent gas from wire perforation place and leak.

Description

Technical Field

[0001] This utility model belongs to the field of temperature measurement technology, specifically relating to a sealing device for a vacuum-sealed thermocouple junction box. Background Technology

[0002] Thermocouples are commonly used temperature measuring elements in industrial production, and their junction boxes protect the internal terminals and wiring. In some special industrial environments, such as vacuum environments, the sealing performance of thermocouple junction boxes is extremely important. Traditional thermocouple junction box sealing devices typically use simple sealing rings or sealants. However, in a vacuum environment, due to the large pressure difference between the inside and outside, traditional sealing methods are prone to failure, allowing external gases or impurities to enter the junction box. This affects the normal operation of the thermocouple, and may even cause inaccurate measurement data, potentially leading to safety accidents in severe cases.

[0003] The patent application CN216203658U discloses a sealing device for a vacuum-sealed thermocouple junction box, comprising a junction box sealing seat, a sealing plug, a pressure ring, and a threaded clamping component. The junction box sealing seat has a first through hole on one side and a mounting groove on the other. An internal thread is provided on the side of the mounting groove away from the first through hole. The threaded clamping component is threadedly connected to the internal thread, pressing the sealing plug and pressure ring into the mounting groove. The sealing plug has a second set of through holes, and the threaded clamping component has a rotating hole. The thermocouple wire can pass through the central hole of the connecting pipe and the pressure ring. When compressed, the sealing plug can compress and fix the thermocouple wire and abut against the inner wall of the mounting groove. Through the sealing of the connecting pipe and the corundum tube assembly, the detachable connection of the connecting pipe and the corundum tube assembly, and the detachable connection of the junction box sealing seat and the junction box, the disassembly of the entire thermocouple is more convenient, and damaged parts are easier to replace, greatly reducing costs.

[0004] The aforementioned patented sealing plug, when compressed, can compress and fix the thermocouple wire and abut against the inner wall of the mounting groove. Through the sealing of the connecting pipe and the corundum tube assembly, the detachable connection of the connecting pipe and the corundum tube assembly, and the detachable connection of the junction box sealing seat and the junction box, the disassembly of the entire thermocouple is more convenient, and it is easier to replace damaged parts, greatly reducing costs. However, the aforementioned patent has certain limitations in use. Traditional thermocouple junction box sealing devices fail to seal in a vacuum environment due to the large pressure difference between the inside and outside, which allows external gas or impurities to enter the junction box, affecting the normal operation of the thermocouple and even causing safety accidents. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing device for vacuum-sealed thermocouple junction boxes, which aims to solve the problem that the sealing device of the existing thermocouple junction box fails due to the large pressure difference between the inside and outside in a vacuum environment, thus allowing external gas or impurities to enter the junction box, affecting the normal operation of the thermocouple or even causing safety accidents.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sealing device for a vacuum-sealed thermocouple junction box, comprising:

[0008] A junction box sealing seat, wherein a threaded connector is fixedly connected to the circumferential surface of the junction box sealing seat, a screw is rotatably connected inside the threaded connector, and a cover is threadedly connected to the circumferential surface of the junction box sealing seat.

[0009] A first spring is fixedly connected to the bottom end of the cover, and a first moisture-proof sealing plug is fixedly connected to one end of the first spring. A junction box body is installed inside the junction box sealing seat, and a support plate is fixedly connected to the outer surface of the junction box body.

[0010] A nut, which is fixedly connected to the circumferential surface of the junction box sealing seat.

[0011] In a preferred embodiment of this utility model, one side of the support plate is fixedly connected to the circumferential surface of the junction box body, and a plastic sealing ring is provided inside the sealing seat, the plastic sealing ring being fixedly connected to the inner wall of one side of the junction box sealing seat.

[0012] In a preferred embodiment of this utility model, a screw is threadedly connected to the inner circumference of the nut, and a sealing ring is fixedly connected to one side of the plastic sealing ring.

[0013] As a preferred embodiment of this utility model, a second spring is fixedly connected to the bottom inner wall of the screw, and a second moisture-proof sealing plug is fixedly connected to one end of the second spring. The second moisture-proof sealing plug is movably engaged with the junction box body.

[0014] As a preferred embodiment of this utility model, the screw is movably engaged with the circumferential surface of the junction box body.

[0015] In a preferred embodiment of this utility model, the sealing ring, the plastic sealing ring, and the support plate are horizontally aligned.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. In this solution, the first spring, after compression, pushes the first moisture-proof sealing plug to press against the top of the junction box body. Together with the plastic sealing ring and sealing ring on the inner wall of the junction box sealing seat, it forms the first planar sealing barrier, preventing gas from entering through the gap between the cover and the sealing seat. The second spring drives the second moisture-proof sealing plug to be inserted into the junction box body, tightly wrapping the thermocouple wire. Combined with the threaded connector and the screw thread fastening, it forms the second three-dimensional sealing structure, preventing gas from leaking from the wire perforation. In addition, the horizontally flush design of the support plate, plastic sealing ring, and sealing ring ensures that the three form a uniform force plane when the cover is tightened, eliminating the stress unevenness problem of traditional single-point sealing, significantly improving the sealing reliability in a vacuum environment, and effectively resisting sealing failure caused by internal and external pressure differences.

[0018] 2. In this solution, the first moisture-proof sealing plug, the second moisture-proof sealing plug, and the plastic sealing ring are all installed independently. When aging or damage occurs, there is no need to disassemble the entire device. Simply unscrew the cover or screw to quickly replace them, reducing maintenance costs and time. The screw and threaded connector use metal threaded fit. The surface of the second sealing ring is coated with a corrosion-resistant coating. The first and second springs are made of fatigue-resistant spring steel. Combined with the moisture-proof sealing plug made of fluororubber, the device can withstand pressure fluctuations and chemical corrosion in a vacuum environment for a long time, extending the overall service life. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a perspective view of the present utility model;

[0021] Figure 2 This is a first-view sectional perspective view of the present invention;

[0022] Figure 3 In this utility model Figure 2 A magnified view of part A.

[0023] In the diagram: 1. Junction box sealing seat; 2. Cover; 201. First spring; 202. First moisture-proof sealing plug; 3. Nut; 4. Screw; 5. Threaded connector; 6. Torque; 601. Second spring; 602. Second moisture-proof sealing plug; 7. Plastic sealing ring; 8. Junction box body; 9. Support plate; 10. Sealing ring. Detailed Implementation

[0024] 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. Example 1

[0025] Please see Figures 1-3 The present invention provides the following technical solution:

[0026] A sealing device for a vacuum-sealed thermocouple junction box, comprising:

[0027] Junction box sealing seat 1, with a threaded connector 5 fixedly connected to the circumferential surface of junction box sealing seat 1, a screw 6 rotatably connected inside the threaded connector 5, and a cover 2 threadedly connected to the circumferential surface of junction box sealing seat 1.

[0028] A first spring 201 is fixedly connected to the bottom end of the cover 2. One end of the first spring 201 is fixedly connected to a first moisture-proof sealing plug 202. A junction box body 8 is installed inside the junction box sealing seat 1, and a support plate 9 is fixedly connected to the outer surface of the junction box body 8.

[0029] Nut 3 is fixedly connected to the circumferential surface of the junction box sealing seat 1.

[0030] In a specific embodiment of this utility model, the junction box sealing seat 1 serves as the basic structure of the entire sealing device, used to support and install the junction box body 8. Its circumferential surface is designed to provide an installation base for the connection of other components such as the threaded pipe 5, the cover 2, and the nut 3.

[0031] The threaded connector 5 is fixedly connected to the circumferential surface of the junction box sealing seat 1 and is used in conjunction with the screw 6. By rotating the screw 6, the internal wiring or components are sealed and fixed, which facilitates installation and disassembly and also provides protection.

[0032] The screw 6 rotates within the threaded connector 5, and its own movement presses against the internal wiring or components, enhancing the sealing effect and preventing external gases, impurities, etc. from entering the device.

[0033] The cover 2 is connected to the junction box sealing seat 1 by threads, which is used to close the junction box sealing seat 1 and protect the internal junction box body 8; and works in conjunction with the first spring 201 and the first moisture-proof sealing plug 202 to achieve the sealing function.

[0034] One end of the first spring 201 is fixedly connected to the bottom of the cover 2, and the other end is connected to the first moisture-proof sealing plug 202. Utilizing its own elasticity, the first moisture-proof sealing plug 202 is tightly fitted to the junction box body 8 or other components. When the cover 2 is tightened, it continuously provides sealing pressure to ensure the sealing effect.

[0035] The first moisture-proof sealing plug 202 is in direct contact with the junction box body 8. Its main function is to prevent moisture and seal, effectively blocking moisture and gas from entering the junction box body 8 and protecting the stability of the internal electrical connections.

[0036] The junction box body 8 is used to install and protect the thermocouple terminals and wiring, and is the core component for realizing temperature measurement signal transmission.

[0037] The support plate 9 is fixed on the outer surface of the junction box body 8, which serves to support and position the junction box body 8, ensuring its stable installation in the junction box sealing seat 1, and at the same time helping to enhance the sealing effect.

[0038] Nut 3 is fixedly connected to the circumferential surface of junction box sealing seat 1. It can be used with bolts and other components to achieve a fixed connection between the entire sealing device and external equipment, ensuring that the device is installed stably.

[0039] Please refer to the details. Figures 1-3 One side of the support plate 9 is fixedly connected to the circumferential surface of the junction box body 8, and a plastic sealing ring 7 is provided inside the sealing seat 1. The plastic sealing ring 7 is fixedly connected to the inner wall of one side of the junction box sealing seat 1.

[0040] In this embodiment: one side of the support plate 9 is fixedly connected to the circumferential surface of the junction box body 8, providing support and positioning for the junction box body 8 within the junction box sealing seat 1, ensuring stable installation of the junction box body 8. At the same time, during the sealing process, it works with other components to ensure the overall stability of the sealing structure. The plastic sealing ring 7 is fixedly connected to the inner wall of one side of the junction box sealing seat 1. Utilizing its own elasticity, it works in conjunction with other sealing components when the cover 2 is tightened to form a sealing surface, preventing external gases, impurities, etc. from entering the interior of the junction box sealing seat 1, thus playing a basic sealing role.

[0041] Please refer to the details. Figures 1-3 The inner circumference of the nut 3 is threaded with a screw 4, and a sealing ring 10 is fixedly connected to one side of the plastic sealing ring 7.

[0042] In this embodiment: the inner circumference of the nut 3 is threadedly connected to the screw 4. By screwing the screw 4 into the nut 3, the entire vacuum-sealed thermocouple junction box sealing device can be fixed to the external equipment, ensuring that the device will not loosen or shift during use, and guaranteeing the firmness and reliability of the installation. One end of the plastic sealing ring 7 is fixedly connected to the sealing ring 10, and the two work together to further enhance the sealing effect. The plastic sealing ring 7 provides a basic elastic seal, and the sealing ring 10 can strengthen the weak points of the seal. Together, they form a tight sealing structure inside the junction box sealing seat 1, effectively preventing the intrusion of external substances and ensuring the stability of the internal environment of the junction box body 8.

[0043] Please refer to the details. Figure 2 A second spring 601 is fixedly connected to the bottom inner wall of the screw 6. A second moisture-proof sealing plug 602 is fixedly connected to one end of the second spring 601. The second moisture-proof sealing plug 602 is movably snapped into the junction box body 8.

[0044] In this embodiment, a second spring 601 is fixedly connected to the inner wall of the bottom of the screw 6, and one end is connected to a second moisture-proof sealing plug 602. When the screw 6 is rotated, the second spring 601 is compressed or extended. The elasticity of the spring makes the second moisture-proof sealing plug 602 tightly and movablely engage with the junction box body 8, further enhancing the moisture-proof sealing effect inside the junction box body 8, effectively preventing external moisture, gas, etc. from entering the junction box body 8, and protecting the internal circuits and connection points.

[0045] Please refer to the details. Figures 1-3 The screw 6 is movably engaged with the circumferential surface of the junction box body 8.

[0046] In this embodiment, the screw 6 is movably engaged with the circumferential surface of the junction box body 8. By rotating the screw 6, its position on the junction box body 8 can be adjusted, thereby driving the second moisture-proof sealing plug 602 to achieve a sealing action.

[0047] Please refer to the details. Figures 1-3 The sealing ring 10, the plastic sealing ring 7, and the support plate 9 are horizontally aligned.

[0048] In this embodiment, the three components are arranged horizontally and flush, forming a regular sealing plane. When the cover 2 is tightened, all three components are subjected to force simultaneously, cooperating to form a multi-layer sealing structure. The plastic sealing ring 7 provides a basic elastic seal, and the sealing ring 10 further enhances the sealing effect.

[0049] The working principle and usage process of this utility model: Junction box body 8 positioning: The junction box body 8 is placed in the junction box sealing seat 1. The support plate 9 on its outer surface contacts the inner wall of the sealing seat to achieve lateral positioning, ensuring that the junction box body 8 is stably centered. The support plate 9 also helps to form a sealing plane that is horizontally flush with the plastic sealing ring 7 and the sealing ring 10.

[0050] The cover 2 is sealed with the sealing seat: one end of the first spring 201 is fixed to the bottom of the cover 2, and the other end is connected to the first moisture-proof sealing plug 202. The cover 2 is tightened clockwise with the threaded interface of the junction box sealing seat 1. At this time, the first spring 201 is compressed, pushing the first moisture-proof sealing plug 202 downward to press the top of the junction box body 8, forming the first elastic seal. At the same time, the plastic sealing ring 7 fixed on the inner wall of the sealing seat is deformed by pressure and contacts the inner side of the cover 2 to form the second sealing surface. The horizontally flush sealing ring 10 works together to strengthen the local sealing weak points.

[0051] Seal between screw 6 and junction box body 8: Insert screw 6 into threaded connector 5, rotate counterclockwise so that the second spring 601 and the second moisture-proof sealing plug 602 at the bottom of the junction box body 8 are aligned with the wire inlet hole, and then tighten screw 6 clockwise. The second spring 601 is compressed and pushes the second moisture-proof sealing plug 602 upward into the junction box body 8, tightly wrapping the thermocouple wire and forming a third seal. At the same time, the threaded engagement between screw 6 and threaded connector 5 further fixes the wire and enhances the port sealing.

[0052] Overall fixation and sealing verification: The device is fixed to the mounting hole of the vacuum equipment by the threaded connection of nut 3 and screw 4; then, a vacuum environment simulation test is carried out, such as evacuating to the target pressure and checking the pressure retention rate. The sealing interfaces such as cover 2, screw 6, wire through hole, etc. are observed in detail, as well as the contact parts between the first / second moisture-proof sealing plug 202 / 602 and junction box body 8, and the mating area between plastic sealing ring 7 and sealing ring 10, for any signs of gas leakage.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing device for a vacuum-sealed thermocouple junction box, characterized in that, include: Junction box sealing seat (1), the circumferential surface of the junction box sealing seat (1) is fixedly connected to a threaded pipe (5), the threaded pipe (5) is rotatably connected to a screw (6), and the circumferential surface of the junction box sealing seat (1) is threadedly connected to a cover (2). A first spring (201) is fixedly connected to the bottom end of the cover (2), and a first moisture-proof sealing plug (202) is fixedly connected to one end of the first spring (201). A junction box body (8) is installed inside the junction box sealing seat (1), and a support plate (9) is fixedly connected to the outer surface of the junction box body (8). Nut (3), which is fixedly connected to the circumferential surface of the junction box sealing seat (1).

2. A vacuum tight thermocouple junction enclosure sealing device according to claim 1, characterized in that: One side of one of the support plates (9) is fixedly connected to the circumferential surface of the junction box body (8), and a plastic sealing ring (7) is provided inside the sealing seat (1). The plastic sealing ring (7) is fixedly connected to the inner wall of one side of the junction box sealing seat (1).

3. A vacuum tight thermocouple junction enclosure sealing device according to claim 2, characterized in that: The nut (3) has a screw (4) threadedly connected to its inner circumference, and a sealing ring (10) is fixedly connected to one side of the plastic sealing ring (7).

4. The sealing device for a vacuum-sealed thermocouple junction box according to claim 3, characterized in that: The bottom inner wall of the screw (6) is fixedly connected to a second spring (601), and one end of the second spring (601) is fixedly connected to a second moisture-proof sealing plug (602). The second moisture-proof sealing plug (602) is movably snapped into the junction box body (8).

5. A vacuum tight thermocouple junction enclosure sealing device according to claim 4, characterized in that: The screw (6) is movably engaged with the circumferential surface of the junction box body (8).

6. A vacuum tight thermocouple junction enclosure sealing device according to claim 5, characterized in that: The sealing ring (10), the plastic sealing ring (7), and the support plate (9) are horizontally aligned.

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