Elastically supported bimetallic temperature sensing element

Abstract

The utility model discloses an elastically supported bimetallic temperature-sensing element, which comprises a supporting seat, a temperature-sensing element and a pointer shaft, the supporting seat is provided with elastic clamping jaws, a gap is formed between every two adjacent elastic clamping jaws, the temperature sensing element is a bimetallic spiral temperature sensing element, and one end of the temperature sensing element is fixed to the end, away from the elastic supporting seat, of one elastic clamping jaw. The other end part of the temperature sensing element is fixed with one end part of the pointer shaft; the setting direction of the pointer shaft is parallel to the axis of the temperature sensing element; and the other end part of the pointer shaft serves as a temperature indicating element connecting part. An argon arc welding or riveting structure is not used at the supporting end of the bimetal thermometer, the supporting seat with the elastic clamping jaw is used for installation, the used temperature sensing rod protection tube is directly made into a tubular structure with a closed bottom, and the bimetal temperature sensing element is directly installed from the upper portion of the temperature sensing rod protection tube. The elastic clamping jaws and the inner wall of the protection pipe can be stably connected in an abutting mode to limit the whole body in the protection pipe, the sealing performance is good, meanwhile, the machining cost is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of instrument temperature sensing element assembly, and in particular relates to an elastically supported bimetallic temperature sensing element. Background Art

[0002] The temperature sensing element of a bimetallic thermometer is made by pressing two metals with different thermal expansion coefficients together, winding them into a spiral, with one end fixed and the other connected to a pointer. When the temperature changes, the side with the higher coefficient of expansion deforms more due to the different thermal expansion coefficients of the two metals, causing the entire spiral to rotate along the helical line, thereby rotating the wire and the pointer, and then indicating the corresponding temperature on the dial.

[0003] The existing bimetallic thermometer support end adopts argon arc welding or riveting structure. The argon arc welding connection must be processed by special equipment, which has high processing costs and low operating efficiency. The riveted structure has high efficiency but poor sealing performance. Utility Model Content

[0004] The utility model provides a bimetallic temperature sensing element with elastic support, which is assembled with a temperature sensing rod protection tube using a support base provided with elastic claws. There is no need to use argon arc welding or riveting structure, and the temperature sensing rod protection tube used can be directly closed at the bottom, so as to solve the deficiencies described in the above-mentioned prior art.

[0005] The technical solution adopted by this utility model is:

[0006] A resiliently supported bimetallic temperature-sensing element comprises a support seat, a temperature-sensing element, and a pointer shaft. The support seat is provided with elastic claws with gaps between adjacent elastic claws. The temperature-sensing element is a bimetallic spiral temperature-sensing element, one end of which is fixed to an elastic claw away from the end of the resilient support seat. The other end of the temperature-sensing element is fixed to one end of the pointer shaft. The pointer shaft is arranged parallel to the axis of the temperature-sensing element. The other end of the pointer shaft serves as a connection for the temperature indicating element. The elastic claw is made of the same material as the support seat because it has a certain degree of deformation capability and can deform to a certain extent along the radial direction of the support seat, facilitating overall installation and fixation.

[0007] As a preferred embodiment of the present invention, the elastic claw connected to the temperature sensing element is provided with an extension portion, and the temperature sensing element is welded to the extension portion. The provision of the extension portion can isolate the temperature sensing element from the top end of the other elastic claws by a distance, thereby preventing the top end of the elastic claw from affecting the operation of the temperature sensing element after installation in the protective tube.

[0008] As a preferred embodiment of the present invention, the extension is bent inwardly of the area defined by each elastic claw; when projected along the axis of the temperature sensing element, the temperature sensing element is positioned within the area defined by each elastic claw. This bend allows the temperature sensing element to be aligned with the pointer shaft with minimal change after welding to the pointer shaft.

[0009] As a preferred solution of the present invention, the end portion of the temperature sensing element fixed to the pointer shaft is provided with an inward folded portion, which is welded to the pointer shaft; and the pointer shaft is located on the axis of the temperature sensing element.

[0010] As a preferred solution of the present invention, the pointer shaft is a steel wire.

[0011] As a preferred solution of the present invention, an elastic claw is provided on the outer circumferential surface of the support seat, and the bottom surface of the support seat is a circular surface with a diameter smaller than the inner diameter of the protective tube.

[0012] As a preferred solution of the present invention, the number of the elastic claws is three or five.

[0013] As a preferred embodiment of the present invention, the elastically supported bimetallic temperature sensing element of the present invention can be directly assembled using a bottom-sealed protective tube or an integrally formed joint tube. After assembly, the outer wall of each elastic claw abuts against the inner wall of the protective tube or the inner wall of the joint tube. After the support seat, temperature sensing element and pointer shaft are welded together, they are installed from above the temperature bag hole reserved in the protective tube or the joint tube. Since the elastic claw has a deformable space, it can move along the protective tube and abut against the inner wall of the protective tube. After assembly, the entire element can be confined within the protective tube, and the circle where the top of each elastic claw is located has the largest diameter.

[0014] As a preferred embodiment of the present invention, the outer layer of the temperature sensing element is an active layer, and the inner layer is a passive layer. The expansion coefficient of the active layer is greater than that of the passive layer. When heated, it contracts inward along the spiral direction, and when cooled, it expands outward along the spiral direction. It can be left-handed or right-handed. The active layer of the temperature sensing element usually used is inside, and the passive layer is outside. It expands outward when heated and contracts inward when cooled. When the thermometer is continuously heated, it expands greatly, which can easily cause the wound element to touch the inner wall of the tube, or cause eccentricity due to expansion deformation. The consequence is that the finished thermometer is prone to needle skipping, needle jamming, etc., and the longer the temperature core expands, the greater the limit on the length of the temperature sensing tube. When a short protective tube is used, large temperature measurement errors will occur.

[0015] The bimetallic thermometer support end of the utility model no longer uses argon arc welding or riveting structure, but uses a support base with elastic claws for installation. The protective tube used is directly made into a tubular structure with a closed bottom. After the temperature sensing element, the support base and the pointer shaft are welded together, they are directly installed from the top of the protective tube. The elastic claws are squeezed and pushed until they are installed in place. The elastic claws can firmly abut against the inner wall of the protective tube to confine the whole inside the protective tube. While having good sealing performance, it also reduces processing costs and improves operating efficiency. The temperature sensing element uses a winding method with an active layer on the outside and a passive layer on the outside. It shrinks when heated and expands when cooled, which avoids the thermometer needle from jumping when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is the main view of the utility model.

[0018] Figure 2 It is a top view of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example:

[0021] An elastically supported bimetallic temperature sensing element comprises a support base 1, a temperature sensing element 2 and a pointer shaft 3; the support base 1 is provided with elastic claws 11, and there is a gap between adjacent elastic claws 11, such as Figure 1 As shown, the elastic claws and the support seat are in a truncated cone shape as a whole. The elastic claws can be processed at the opening of the truncated cone without additional welding. In this way, the elastic claws 11 distributed on the outer circumference of the disc are obtained. The number of elastic claws is not limited and can be three or five. This embodiment shows five. Figure 2 The circle where the top of each elastic claw is located has the largest diameter, and because the inside and side of the elastic claw are hollow, the elastic claw can be extended and retracted inward and outward.

[0022] To prevent the elastic claw from interfering with the temperature sensing element, an extension 111 is provided on the elastic claw 11 connected to the temperature sensing element 2. This extension is located at the end of the elastic claw 11 away from the elastic support seat. To ensure that the elastic claw's fixing function is not affected, the extension 111 is bent inwardly of the area defined by each elastic claw. The temperature sensing element 2 is welded to the extension. The extension isolates the temperature sensing element from the top of the other elastic claws by a distance, preventing the top of the elastic claw from interfering with the temperature sensing element after installation in the protective tube, while also maintaining the elastic claw's primary fixing function. After assembly, the projection of the temperature sensing element 2 along its axis is located within the projection area defined by each elastic claw 11. The bend allows the pointer shaft to be aligned with the axis of the temperature sensing element with minimal change after welding.

[0023] The temperature sensing element 2 is a bimetallic spiral temperature sensing element. The other end of the temperature sensing element 2 is provided with an inward fold 21, which is welded to the pointer shaft 3. The pointer shaft 3 is arranged parallel to the axis of the temperature sensing element 2, and preferably located on the axis of the temperature sensing element 2. The pointer shaft 3 is made of steel wire, and the other end of the pointer shaft 3 serves as the connection portion for the temperature indicating element.

[0024] After the support base and the pointer shaft of the temperature sensing element box are welded, they can be installed from the top of the protective tube with a closed bottom. The outer wall of the elastic claw abuts against the inner wall of the protective tube, firmly fixing the whole body to the inner wall of the protective tube. In this way, even if there is vibration, it will not rotate and affect the value indicated by the thermometer.

[0025] The protective tube used is a closed-bottom structure. The support base 1, temperature sensor 2, and pointer shaft 3 are assembled within the protective tube, with the outer walls of each elastic claw 11 abutting the inner wall of the protective tube. The support base 1, temperature sensor 2, and pointer shaft 3 are welded together before being installed from the top of the protective tube. Because the elastic claws have a deformable space, they can move along the protective tube and abut against the inner wall. Once assembled, they can be confined within the protective tube. The circle where the top of each elastic claw is located has the largest diameter.

[0026] Of course, an integrally formed joint pipe can also be used, and the utility model can be installed from above the reserved temperature-controlled hole, with the top of each elastic claw abutting against the inner wall of the joint pipe.

[0027] The temperature sensing element can use a conventional winding method with the active layer inside and the passive layer outside, or a winding method with the active layer outside and the passive layer inside. This embodiment takes the outer layer of the temperature sensing element 2 as the active layer and the inner layer as the passive layer as an example for demonstration. The expansion coefficient of the active layer is greater than the expansion coefficient of the passive layer. When heated, it contracts inward along the spiral direction and expands outward along the spiral direction when cooled. It can be left-handed or right-handed. This embodiment takes left-handed as an example for demonstration, but right-handed is also possible.

[0028] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0029] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An elastically supported bimetallic temperature sensing element, characterized in that: The invention comprises a support base (1), a temperature sensing element (2) and a pointer shaft (3); the support base (1) is provided with elastic claws (11), and there is a gap between adjacent elastic claws (11); the temperature sensing element (2) is a bimetallic spiral temperature sensing element, and one end of the temperature sensing element (2) is fixed to an end of an elastic claw (11) away from the elastic support base; the other end of the temperature sensing element (2) is fixed to one end of the pointer shaft (3); the setting direction of the pointer shaft (3) is parallel to the axis of the temperature sensing element (2); and the other end of the pointer shaft (3) serves as a connection part of the temperature indicating element.

2. The elastically supported bimetallic temperature sensing element according to claim 1, characterized in that: The elastic claw (11) connected to the temperature sensing element (2) is provided with an extension portion (111), and the temperature sensing element (2) and the extension portion are welded.

3. The elastically supported bimetallic temperature sensing element according to claim 2, characterized in that: The extension portion (111) is bent toward the inside of the area defined by each elastic claw; on the projection surface in the axial direction of the temperature sensing element (2), the projection of the temperature sensing element (2) is located within the projection area defined by each elastic claw (11).

4. The elastically supported bimetallic temperature sensing element according to claim 2 or 3, characterized in that: The end portion where the temperature sensing element (2) and the pointer shaft (3) are fixed is provided with an inward folding portion (21), and the inward folding portion (21) and the pointer shaft (3) are welded; and the pointer shaft (3) is located on the axis of the temperature sensing element (2).

5. The elastically supported bimetallic temperature sensing element according to claim 4, characterized in that: The pointer shaft (3) is a steel wire.

6. The elastically supported bimetallic temperature sensing element according to claim 4, characterized in that: An elastic claw (11) is provided on the outer circumferential surface of the support seat (1).

7. The elastically supported bimetallic temperature sensing element according to claim 6, characterized in that: The number of the elastic claws (11) is three or five.

8. The elastically supported bimetallic temperature sensing element according to any one of claims 1 to 3, characterized in that: The outer layer of the temperature sensing element (2) is an active layer, and the inner layer is a passive layer.

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