Adjustable temperature-measuring bimetallic temperature-sensing element

Abstract

The utility model discloses an adjustable temperature-measuring bimetallic temperature-sensing element, which comprises a supporting disc, a temperature-sensing element and a pointer shaft, an adjusting groove is arranged at the bottom of the supporting disc, an elastic piece is arranged on the outer circumferential surface of the supporting disc, and the elastic piece protrudes out of the outer circumferential surface of the supporting disc; the top of the supporting disc is fixed to one end of the temperature sensing element, and the other end of the temperature sensing element is fixed to the end of the pointer shaft. The other end part of the pointer shaft is used as a temperature indicating element connecting part; the axes of the supporting disc, the temperature sensing element and the pointer shaft are parallel. The supporting disc serves as a temperature measuring end and an adjusting end of the whole, the elastic piece can be tightly combined with the inner wall of the thermometer probe rod and can still rotate when needing to rotate, a tool is inserted into the adjusting groove to rotate the supporting disc, the temperature sensing element and the pointer shaft on the supporting disc can be driven to rotate synchronously, and the pointer shaft rotates to drive the pointer connected with the pointer shaft to rotate. Therefore, the indication value can be adjusted. The elastic piece can ensure that the whole body cannot loosen and is fixed in the thermometer probe rod, provides convenience for in-situ rotation, and cannot loosen to affect inaccurate temperature value after adjustment is finished.

Description

Technical Field

[0001] This utility model belongs to the field of instrument temperature control technology, specifically relating to an adjustable bimetallic temperature sensing element. Background Technology

[0002] The sensing element of a bimetallic thermometer is made by pressing two metals with different coefficients of thermal expansion together and winding them into a spiral shape. One end is fixed, and the other end is connected to a pointer. When the temperature changes, the two metals deform more due to their different coefficients of thermal expansion, causing the entire spiral temperature core to rotate along the spiral direction. This, in turn, drives the steel wire and the pointer to rotate, indicating the corresponding temperature value on the dial.

[0003] The existing bimetallic thermometers adjust the temperature by rotating the pointer to indicate the temperature, which involves argon arc welding. This method is inefficient for mass production. Utility Model Content

[0004] This invention provides an adjustable bimetallic temperature sensing element, which uses a support disc with an adjustment groove and an elastic element as the adjustment structure for the temperature indication value, making temperature adjustment intuitive and efficient.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An adjustable bimetallic temperature sensing element includes a support disk, a temperature sensing element, and a pointer shaft. The bottom of the support disk has an adjustment groove, and an elastic element protrudes from the outer circumference of the support disk. The top of the support disk is fixed to one end of the temperature sensing element, and the other end of the temperature sensing element is fixed to the end of the pointer shaft. The other end of the pointer shaft serves as a connection part for a temperature indicating element. The axes of the support disk, the temperature sensing element, and the pointer shaft are parallel. The support disk serves as both the temperature sensing end and the adjustment end of the entire assembly. The elastic element allows for a tight fit with the inner wall of the thermometer probe, yet it can still rotate when needed. By inserting a tool into the adjustment groove and rotating the support disk, the temperature sensing element and the pointer shaft on it can rotate synchronously. The rotation of the pointer shaft causes the connected pointer to rotate, thereby adjusting the indicated value. The elastic element ensures that the entire assembly remains fixed within the thermometer probe and facilitates rotation in place. After adjustment, there will be no loosening that could affect the accuracy of the temperature reading.

[0007] As a preferred embodiment of this utility model, the elastic element is an O-ring, and a groove is provided on the outer circumference of the supporting disc, with the elastic element fitted inside the groove.

[0008] As a preferred embodiment of this utility model, the temperature sensing element is a bimetallic spiral temperature sensing element.

[0009] In a preferred embodiment of this invention, a boss is provided on the top of the supporting disc, and the temperature sensing element is welded to the outer wall of the boss. The boss is located at the center of the supporting disc, and the center of the boss overlaps with the center of the supporting disc, which facilitates the welding of the temperature sensing element.

[0010] In a preferred embodiment of this invention, the adjustment groove is a straight groove, and the adjustment groove is arranged radially along the supporting disk, with its axis passing through the center of the supporting disk. A flathead screwdriver can be inserted into the adjustment groove to rotate the supporting disk.

[0011] In a preferred embodiment of this invention, the end of the temperature-sensing element that is fixed to the pointer shaft has an inwardly folded portion, which is welded to the pointer shaft; and the pointer shaft is located on the axis of the temperature-sensing element. The inwardly folded portion facilitates the pointer shaft being positioned on the axis of the temperature-sensing element, and the end of the spiral can be bent inwards directly.

[0012] In a preferred embodiment of this 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 rotate left or right. In commonly used temperature-sensing elements, the active layer is on the inside and the passive layer is on the outside. It expands outward when heated and contracts inward when cooled. When the thermometer is continuously heated, the expansion is large, which can easily cause the winding element to touch the inner wall of the tube, or cause misalignment due to expansion deformation. As a result, the finished thermometer is prone to problems such as needle skipping and needle jamming. Moreover, the longer the temperature core expands, the more it limits the length of the temperature-sensing tube. When using a short protective tube, a large temperature measurement error may occur.

[0013] This invention features a slotted groove on the bottom surface of the supporting disc and an O-ring on the outer circumference, ensuring stable assembly within the thermometer probe. The slotted groove also allows for adjustment of the pointer indication, providing a clear visual indication of the numerical change during adjustment. Furthermore, the thermometer probe remains stable after adjustment. The sensing element utilizes a winding method with the active layer on the outside and the passive layer on the outside, allowing for thermal contraction and thermal expansion, thus preventing the thermometer from jamming or jumping during use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the front view of the present invention.

[0016] Figure 2This is a bottom view of the present invention.

[0017] Figure 3 This is a top view of the present invention, omitting the supporting disk. Detailed Implementation

[0018] 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.

[0019] Example:

[0020] An adjustable bimetallic temperature sensing element, such as Figure 1 As shown, it includes a supporting disc 1, a temperature sensing element 2, and a pointer shaft 3. The pointer shaft is a steel wire, and the temperature sensing element 2 is a bimetallic spiral temperature sensing element. The bottom of the supporting disc 1 is provided with an adjustment groove 11, which can be rotated using a tool. This embodiment uses a straight groove as an example. Figure 2 As shown, the adjustment groove 11 is arranged radially along the support disk, and the axis of the adjustment groove passes through the center of the support disk. An elastic element 4 is provided on the outer circumferential surface of the support disk 1. The elastic element 4 protrudes from the outer circumferential surface of the support disk and is mainly fixed by contacting the inner wall of the thermometer probe. In this embodiment, an O-ring is used. A groove 12 is provided on the outer circumferential surface of the support disk 1, and the O-ring is fitted in the groove 12.

[0021] To facilitate the welding of the temperature sensing element, a boss 13 is provided on the top of the support disk 1, and the temperature sensing element 2 is welded to the outer wall of the boss 13. The boss is located at the center of the support disk, and the center of the boss overlaps with the center of the support disk, which facilitates the welding of the temperature sensing element.

[0022] The other end of the temperature sensing element 2, that is, the end fixed to the pointer shaft 3, is provided with an inward fold 21, such as... Figure 3 As shown, the inner fold 21 is welded to the pointer shaft 3; after welding, the pointer shaft 3 is located on the axis of the temperature sensing element 2. The inner fold facilitates the pointer shaft being on the axis of the temperature sensing element; the end of the spiral can be bent inward directly. In this embodiment, the inner fold 21 is perpendicular to the adjustment groove 11.

[0023] The other end of the pointer shaft 3 serves as a connection part for the temperature indicating element, used for welding to the temperature indicating element. The axes of the supporting disk 1, the temperature sensing element 2, and the pointer shaft 3 are parallel, and the outer diameter of the O-ring is the largest. When assembled into the thermometer probe, the O-ring tightly adheres to the inner wall of the probe, confining the entire assembly within the thermometer probe. When it is necessary to change the indicated value, simply insert a flathead screwdriver into the adjustment slot and rotate the supporting disk. Under the elastic action of the elastic element, the supporting disk can rotate in place. The temperature sensing element and the pointer shaft on the supporting disk rotate synchronously. The rotation of the pointer shaft will drive the pointer to rotate, thereby adjusting the indicated value. After adjustment, the elastic element remains tightly fitted inside the probe and will not wobble, preventing errors in the indicated value.

[0024] The temperature sensing element can be wound in a conventional manner with the active layer inside and the passive layer outside, or it can be wound with the active layer outside and the passive layer inside. In this embodiment, the outer layer of the temperature sensing element 2 is the active layer and the inner layer is the 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 expands outward along the spiral direction when cooled. It can be wound to the left or right. In this embodiment, left-handed winding is used as an example, but right-handed winding is also possible.

[0025] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0026] 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. An adjustable bimetallic temperature sensing element, characterized in that: The device includes a support disc (1), a temperature sensing element (2), and a pointer shaft (3). The bottom of the support disc (1) is provided with an adjustment groove (11), and an elastic element (4) is provided on the outer circumferential surface of the support disc (1). The elastic element (4) protrudes from the outer circumferential surface of the support disc. The top of the support disc (1) is fixed to one end of the temperature sensing element (2), and the other end of the temperature sensing element (2) is fixed to the end of the pointer shaft (3). The other end of the pointer shaft (3) serves as a connection part for a temperature indicating element. The axes of the support disc (1), the temperature sensing element (2), and the pointer shaft (3) are parallel.

2. The adjustable bimetallic temperature sensing element according to claim 1, characterized in that: The elastic element is an O-ring, and a groove (12) is provided on the outer circumference of the supporting disc (1), and the elastic element (4) is fitted into the groove (12).

3. The adjustable bimetallic temperature sensing element according to claim 1 or 2, characterized in that: The temperature sensing element (2) is a bimetallic spiral temperature sensing element.

4. The adjustable bimetallic temperature sensing element according to claim 3, characterized in that: The top of the supporting disc (1) is provided with a boss (13), and the temperature sensing element (2) is welded to the outer wall of the boss (13).

5. The adjustable bimetallic temperature sensing element according to claim 4, characterized in that: The adjustment groove (11) is a straight groove, and the adjustment groove (11) is arranged radially along the support disk, with the axis of the adjustment groove passing through the center of the support disk.

6. The adjustable bimetallic temperature sensing element according to claim 5, characterized in that: The end of the temperature sensing element (2) that is fixed to the pointer shaft (3) is provided with an inner fold (21), and the inner fold (21) is welded to the pointer shaft (3); and the pointer shaft (3) is located on the axis of the temperature sensing element (2).

7. The adjustable bimetallic temperature sensing element according to claim 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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