Sensor device capable of preventing induction needle from twisting and loosening

Abstract

The utility model discloses a sensor device capable of preventing torsion loosening and loosening of an induction needle, which belongs to the technical field of combustion equipment sensors and comprises the induction needle, a ceramic insulator, a metal support plate and a wire connecting end, the top end of the induction needle is used for receiving signals, and symmetrical limiting blocks are arranged in the middle of a vertical rod of the induction needle; a limiting hole is formed in one end of the ceramic insulator, a round hole is formed in the other end of the ceramic insulator, a plurality of convex ribs are arranged on the inner wall of the round hole, the limiting block of the induction needle is matched with the limiting hole, and the convex ribs are in interference fit with the lower surface of the induction needle; the metal support plate is used for installing and fixing the ceramic insulator; and the wire connecting end is electrically connected with the bottom end of the induction needle, is used for transmitting signals, and physically fixes the induction needle through the limiting hole and the convex rib structure of the ceramic insulator. And the convex ribs are in interference fit with the induction needle, so that the induction needle is prevented from rotating, loosening or loosening due to torsion or vibration.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment sensor technology, and in particular to a sensor device with anti-torsion and anti-loosening of the sensing needle. Background Technology

[0002] In the manufacturing process of sensors used in combustion equipment, a high-temperature inorganic adhesive is typically used for bonding and curing to ensure a firm connection between the sensing needle and the ceramic insulator. However, this high-temperature inorganic adhesive is relatively expensive; it is brittle after curing, not impact-resistant, and has poor water resistance, easily absorbing moisture. During operation, the combustion equipment generates moisture and oil droplets, which can slide down the sensing needle onto the inorganic adhesive, eventually causing it to degrade and loosen, thus affecting the sensor's function. Furthermore, because the inorganic adhesive is liquid before curing, the sensing needle and ceramic insulator need to be moved to an oven for curing after the adhesive is applied. This process can also cause the two components to loosen or shift, and once the problem is discovered after curing, rework is impossible. Utility Model Content

[0003] The purpose of this invention is to solve the problems mentioned in the background art, such as the induction needle being easy to loosen, detach, and misinterpret signals.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A sensor device with anti-torsion and anti-loosening features for the sensing needle includes a sensing needle, a ceramic insulator, a metal support plate, and a wire connection end. The sensing needle has a top end for receiving signals, and a symmetrical limiting block in the middle of its vertical shaft. The ceramic insulator has a limiting hole at one end and a circular hole at the other end. Several raised ribs are fixed to the inner wall of the circular hole. The limiting block of the sensing needle is adapted to the limiting hole, and the raised ribs are interference-fitted with the lower surface of the sensing needle. The metal support plate is used to mount and fix the ceramic insulator. The wire connection end is electrically connected to the bottom end of the sensing needle for transmitting signals.

[0006] Preferably, the depth of the limiting hole is 15-30mm, and the length of the inner rib of the circular hole is 8-12mm.

[0007] Preferably, the limiting block on the sensing needle is formed by flattening.

[0008] Preferably, the rib forms a circular constraint area within the circular hole with a diameter smaller than that of the sensing needle by 0.12-0.2 mm.

[0009] Preferably, the upper end of the conductor connection terminal is in contact with the bottom end face of the ceramic insulator.

[0010] Preferably, the lower end of the limiting block contacts the bottom wall of the limiting hole.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The sensing needle is physically fixed by the limiting holes and rib structure of the ceramic insulator. The ribs are interference-fitted with the sensing needle to prevent the sensing needle from rotating, loosening, or coming off due to torque or vibration.

[0013] The glue-free design avoids the corrosion of the adhesive joint by moisture and oil drips. The raised ribs and limiting hole structure of the ceramic insulator are solid structures that are resistant to high temperature and impact, adapting to the complex working conditions of combustion equipment with high temperature, high humidity and a lot of oil, thus improving service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. 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.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of the ceramic insulator of this utility model.

[0017] Figure 3 For the present utility model Figure 2 Enlarged diagram of point A in the middle.

[0018] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0019] Drawing number explanation: 1. Sensing needle; 2. Ceramic insulator; 3. Metal support plate; 4. Wire connection end; 5. Limiting block; 6. Limiting hole; 7. Round hole; 8. Raised rib. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0022] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0023] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0024] Please see Figures 1-4 A sensor device with anti-torsion and anti-loosening features for the sensing needle includes a sensing needle 1, a ceramic insulator 2, a metal support plate 3, and a wire connection end 4. The top of the sensing needle 1 is used to receive signals, and the middle of the vertical rod of the sensing needle 1 has symmetrical limiting blocks 5. The limiting blocks 5 on the sensing needle 1 are formed by flattening. One end of the ceramic insulator 2 has a limiting hole 6, and the other end has a circular hole 7. The limiting hole 6 has a depth of 15-30mm, and the limiting hole 6 and the circular hole 7 are connected. The limiting hole 6 is located on the upper side, and the circular hole 7 is located on the lower side. The length of the protruding rib 8 inside the circular hole 7 is 8-12mm, and several protruding ribs 8 are fixed on the inner wall of the circular hole 7. The limiting block 5 of the sensing needle 1 is adapted to the limiting hole 6, and the protruding rib 8 is interference-fitted with the lower surface of the sensing needle 1. The metal support plate 3 is used to install and fix the ceramic insulator 2. The metal support plate 3 has mounting holes, through which it is installed on a combustion device. The wire connection end 4 is electrically connected to the bottom end of the sensing needle 1 for signal transmission.

[0025] The raised rib 8 forms a circular constraint area within the circular hole 7 with a diameter smaller than that of the sensing needle by 0.12-0.2 mm, and the raised rib 8 is located at the bottom of the circular hole 7.

[0026] The upper end of the wire connection end 4 contacts the bottom surface of the ceramic insulator 2 and is fixedly connected to the bottom end of the sensing needle 1 through the wire connection end 4. The lower end of the limiting block 5 contacts the bottom wall of the limiting hole 6, preventing the sensing needle 1 from moving longitudinally. The limiting block 5 is inserted into the limiting hole 6, limiting the sensing needle 1 in the circumferential direction.

[0027] The vertical rod of the sensing needle 1 is inserted into the ceramic insulator 2 through one end of the limiting hole 6. The sensing needle 1 and the ceramic insulator 2 are placed in a special tooling fixture. The sensing needle 1 is pushed along the axis by a cylinder until the limiting block 5 reaches the step where the limiting hole 6 and the round hole 7 meet. In this way, the sensing needle 1 will be firmly fixed to the ceramic by several protruding ribs 8 through interference fit. At this time, the round hole 7 of the sensing needle 1 is exposed by 20mm, which is used to connect the wire connection end 4. The fixed sensor device is taken out, and the bottom end of the sensing needle 1 is welded to the wire connection end 4 by argon arc welding, so that the sensing needle 1 is fixed inside the ceramic and will not loosen, nor will the sensing needle 1 rotate and loosen due to torque.

[0028] When the sensor device is used for flame detection, the tip of the sensing needle 1 receives the flame signal. The limiting hole 6 and the rib 8 structure of the ceramic insulator 2 ensure that the sensing needle 1 remains stable in high-temperature and vibration environments, avoiding signal interruption or misjudgment due to loosening. The interference fit formed by the rib 8 and the sensing needle 1, combined with the circumferential constraint of the limiting hole 6, effectively resists torque and axial tension, ensuring long-term stable operation.

[0029] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A sensor device with anti-torsion and anti-loosening features for the sensing needle, characterized in that, include: The sensing needle (1) has a top end for receiving signals, and the vertical rod of the sensing needle (1) has symmetrical limiting blocks (5) in the middle. The ceramic insulator (2) has a limiting hole (6) at one end and a round hole (7) at the other end. Several ribs (8) are fixed on the inner wall of the round hole (7). The limiting block (5) of the sensing needle (1) is adapted to the limiting hole (6). The ribs (8) are interference-fitted with the lower surface of the sensing needle (1). Metal bracket plate (3) is used to install and fix ceramic insulator (2); The wire connection end (4) is electrically connected to the bottom end of the sensing needle (1) for transmitting signals.

2. The sensor device with anti-torsion and anti-loosening features for the sensing needle according to claim 1, characterized in that: The depth of the limiting hole (6) is 15-30mm, and the length of the inner rib (8) of the round hole (7) is 8-12mm.

3. The sensor device with anti-torsion and anti-loosening features for the sensing needle according to claim 1, characterized in that: The limiting block (5) on the sensing needle (1) is formed by flattening.

4. The sensor device with anti-torsion and anti-loosening features for the sensing needle according to claim 1, characterized in that: The rib (8) forms a circular constraint area within the circular hole (7) with a diameter smaller than that of the sensing needle by 0.12-0.2 mm.

5. A sensor device with anti-torsion and anti-loosening features for the sensing needle according to claim 1, characterized in that: The upper end of the wire connection end (4) is in contact with the bottom end face of the ceramic insulator (2).

6. A sensor device with anti-torsion and anti-loosening features for the sensing needle according to claim 1, characterized in that: The lower end of the limiting block (5) is in contact with the bottom wall of the limiting hole (6).

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