Bimetal thermometer movement and thermometer

Abstract

The utility model relates to the technical field of instrument equipment, in particular to a bimetal thermometer movement and a thermometer, and the bimetal thermometer movement comprises a base, a pointer shaft, a transmission shaft, a connecting piece and a transmission assembly. Wherein the transmission shaft is provided with a limiting pin, and the limiting pin is cylindrical. The connecting piece is tubular, and the lower section of the transmission shaft is arranged in the connecting piece in a penetrating mode. The connecting piece is provided with a limiting groove, and the limiting pin is located in the limiting groove. When in use, the upper end of the connecting wire connected with the temperature core is fixedly connected with the connecting piece. When the temperature is detected, the connecting wire drives the connecting piece to rotate. The limiting groove of the connecting piece is matched with the limiting pin to drive the transmission shaft to rotate, and the transmission shaft drives the pointer shaft and the temperature pointer to rotate to indicate temperature through the transmission assembly. When the limiting pin deflects around the longitudinal axis of the limiting pin, due to the fact that the limiting pin is cylindrical, the limiting pin cannot be clamped in the limiting groove, the flexibility of relative movement between the limiting pin and the connecting piece is guaranteed, and therefore the accuracy of the thermometer is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument equipment, in particular to a bimetallic thermometer movement and a thermometer. Background Art

[0002] The bimetallic thermometer is made by combining two metals with different linear expansion coefficients and winding them into a spiral temperature core. One end of the temperature core is fixed and the other end is connected to the pointer. When the temperature changes, the two metals have different thermal expansions, which drives the pointer to deflect to indicate the temperature.

[0003] There is a kind of angle movement for bimetallic thermometer (Announcement No.: CN 219038205 U), which is provided with a connecting assembly and an indicating assembly perpendicular to each other on the machine base, the connecting assembly includes a connector 14 and a first gear, and the first gear and the second gear perpendicularly meshed with each other on the connecting assembly and the indicating assembly are linked, so that when the connecting assembly is driven to rotate by the bimetallic strip, the indicating assembly rotates accordingly. Among them, since the temperature core will also produce longitudinal expansion and contraction when rotating, in order to ensure that the temperature core will not be hindered when expanding and contracting, there needs to be a certain longitudinal relative activity space between the connecting wire and the connector 14. A limiting groove 15 is provided on the connector 14, and a limiting plate 16 adapted to the limiting groove 15 is provided at the end of the connecting wire. The limiting plate 16 is inserted into the limiting groove 15 to control the rotation of the connector 14, thereby providing a longitudinal relative activity space between the connecting wire and the connector 14.

[0004] However, there are some problems with this product when it is used. Since the limiting piece 16 is in the form of a sheet, the sliding between the limiting piece 16 and the limiting groove 15 is not smooth. Especially when the thermometer is placed horizontally, the connecting wire deflects the limiting piece 16 around its longitudinal axis under the action of gravity, which easily leads to the clamping of the limiting groove 15, so that the temperature core is hindered when it is longitudinally extended or contracted, and then the pointer is prone to jamming and jumping when it is deflected, reducing the accuracy of the thermometer. Utility Model Content

[0005] The utility model aims to provide a bimetallic thermometer movement and a thermometer, aiming to improve the flexibility of relative movement between a connecting wire and a connector, thereby improving the accuracy of the thermometer.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] In a first aspect, a bimetallic thermometer movement is provided, comprising:

[0008] Machine base;

[0009] A pointer shaft, rotatably mounted on the base;

[0010] A transmission shaft is rotatably mounted on the machine base, the transmission shaft is perpendicular to the pointer shaft, and a limit pin is provided on the transmission shaft, the limit pin is cylindrical;

[0011] A connecting piece, the connecting piece is tubular, the lower section of the transmission shaft is inserted into the connecting piece, the connecting piece is provided with a limiting groove, and the limiting pin is movably connected in the limiting groove;

[0012] A transmission assembly is installed on the machine base, and transmission is transmitted between the transmission shaft and the pointer shaft through the transmission assembly.

[0013] By adopting the above scheme, when in use, the upper end of the connecting wire connected to the temperature core is fixedly connected to the connecting piece, and when detecting the temperature, the temperature core drives the connecting piece to rotate through the connecting wire. The limit groove of the connecting piece drives the transmission shaft to rotate by cooperating with the limit pin, and the transmission shaft drives the pointer shaft to rotate through the transmission assembly, thereby driving the pointer connected to the pointer shaft to indicate the temperature. Since the limit pin is cylindrical, when the limit pin deflects around its longitudinal axis, the diameter of the limit pin stuck in the limit groove remains unchanged, and the limit pin will not be stuck in the limit groove when deflected, ensuring the flexibility of relative movement between the limit pin and the connecting piece. Thereby avoiding affecting the expansion and contraction of the temperature core, and further avoiding affecting the measurement accuracy of the thermometer.

[0014] The utility model is further configured that one end of the transmission shaft located in the connecting piece has a limiting portion, the limiting portion is spherical, the diameter of the limiting portion is larger than the diameter of the transmission shaft, and the limiting portion and the connecting piece are clearance-matched. Since the limiting portion and the inner wall of the connecting piece are in line-surface contact, the friction between the two is reduced.

[0015] The utility model is further configured that the lower section of the connector is provided with a limiting hole, and the limiting hole is threadedly connected with a limiting nut. When in use, one end of the connecting wire is inserted into the inner side of the lower section of the connector, and the limiting nut is used to tighten the connecting wire, thereby facilitating the fixing of the connecting wire.

[0016] The utility model is further configured such that the connector has an enlarged diameter section and a reduced diameter section, the inner diameter of the reduced diameter section is smaller than the enlarged diameter section, the transmission shaft is located in the enlarged diameter section, and the limit hole is located in the reduced diameter section. Since the diameter of the connecting wire is small, the connecting wire is fixed in the reduced diameter section with a smaller diameter, and the inner diameter of the reduced diameter section matches the outer diameter of the connecting wire, so that the connecting wire can be coaxial with the connector after being fixed in the reduced diameter section, ensuring that the rotation transmission between the connector and the connecting wire can be consistent.

[0017] The utility model is further configured such that the transmission assembly includes a first gear and a second gear, the first gear is fixedly connected to the transmission shaft, the second gear is fixedly connected to the pointer shaft, and the first gear and the second gear are meshed and connected. Through the transmission of the first gear and the second gear, the transmission shaft and the pointer shaft, which are perpendicular to each other, can be effectively transmitted, and since the installation space required by the gears is small, the installation space is saved, thereby reducing the volume of the entire component.

[0018] The utility model is further configured that the base includes a mounting plate, a first wing plate and a second wing plate, the first wing plate and the second wing plate are both fixedly connected to the base, the first wing plate and the second wing plate are both provided with a first shaft hole, and the transmission shaft is rotatably mounted in the two first shaft holes. Since the transmission shaft is rotatably mounted in the two first shaft holes, the transmission shaft is more stable when rotating.

[0019] The utility model is further configured that a through hole is opened on the mounting plate, and the first gear part passes through the through hole. After the first gear part passes through the through hole, it is connected with the second gear, making the structure compact, thereby reducing the space occupied by the overall structure.

[0020] The utility model is further configured such that the through hole is located between the first wing plate and the second wing plate. Since the through hole is located between the first wing plate and the second wing plate, the size of the mounting plate is reduced, the structure is compact, and the space occupied by the overall structure is reduced.

[0021] The utility model is further configured to include a reset hairspring, the reset hairspring is spiral, the fixed end of the reset hairspring is fixedly connected to the machine base, and the movable end of the reset hairspring is fixedly connected to the pointer shaft. The reset hairspring can eliminate the gap between the first gear and the second gear, thereby ensuring the accuracy of the transmission between the two.

[0022] In a second aspect, a thermometer is provided, comprising the above-mentioned bimetallic thermometer movement.

[0023] In summary, the bimetallic thermometer movement and thermometer provided by the utility model have at least the following beneficial effects:

[0024] 1. The smoothness of the longitudinal relative movement between the connector and the connecting wire is improved, and the situation that the pointer of the thermometer is stuck or jumps due to the jamming between the limit groove and the limit pin is effectively avoided.

[0025] 2. The connecting wire and the connecting parts are easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any novel labor.

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the movement in the embodiment;

[0028] Figure 2 is an exploded schematic diagram of the movement in the embodiment;

[0029] Figure 3 is a schematic diagram of the three-dimensional structure of the movement assembled to the thermometer in the embodiment;

[0030] Figure 4 It is a schematic diagram of the connection between the limiting groove and the limiting piece of the connector in the background technology.

[0031] In the figure: base 1, mounting plate 101, first wing plate 102, second wing plate 103, first axial hole 104, connecting column 105, positioning member 106, second axial hole 107, mounting hole 108, through hole 109, pointer shaft 2, transmission shaft 3, limit pin 4, connecting member 5, limit groove 6, transmission assembly 7, first gear 701, second gear 702, limit part 8, limit hole 9, limit nut 10, connecting wire 11, temperature core 12, reset hairspring 13, connector 14, limit groove 15, limit plate 16. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the technical solution of the utility model, the following Figure 1-3 The utility model is further described in detail with specific implementation methods.

[0033] See also Figure 1-3A bimetallic thermometer movement provided in this embodiment includes: a base 1, a pointer shaft 2, a transmission shaft 3, a connector 5 and a transmission assembly 7. The pointer shaft 2 is rotatably mounted on the base 1, and the transmission shaft 3 is rotatably mounted on the base 1, and the transmission shaft 3 is perpendicular to the pointer shaft 2. Among them, the transmission shaft 3 is arranged vertically, and the pointer shaft 2 is arranged horizontally. A limit pin 4 is provided at the lower section of the transmission shaft 3, and the limit pin 4 is fixedly connected to the transmission shaft 3, and the limit pin 4 is cylindrical. The number of limit pins 4 is preferably two, and the two limit pins 4 are symmetrically arranged with the transmission shaft 3 as the center. The connector 5 is tubular, and the lower section of the transmission shaft 3 is penetrated in the connector 5, and the connector 5 is provided with a limit groove 6, and the limit pin 4 is movably connected in the limit groove 6. The size of the limit pin 4 matches the limit groove 6, so that the limit pin 4 can slide in the limit groove 6. Specifically, the connecting member 5 is vertically arranged, and the limiting groove 6 is opened downward from the upper end of the connecting member 5, so as to form a downward notch at the upper end of the connecting member 5. Preferably, two limiting grooves 6 are provided, and the two limiting grooves 6 correspond to the two limiting pins 4 one by one. The transmission assembly 7 is installed on the machine base 1, and the transmission shaft 3 and the pointer shaft 2 are transmitted through the transmission assembly 7.

[0034] By adopting the above scheme, when in use, the upper end of the connecting wire 11 connected to the temperature core 12 is fixedly connected to the connecting member 5. When detecting the temperature, the temperature core 12 drives the connecting member 5 to rotate through the connecting wire 11. The limit groove 6 of the connecting member 5 drives the transmission shaft 3 to rotate by cooperating with the limit pin 4. The transmission shaft 3 drives the pointer shaft 2 to rotate through the transmission assembly 7, thereby driving the pointer connected to the pointer shaft 2 to indicate the temperature. Since the limit pin 4 is cylindrical, when the limit pin 4 deflects around its longitudinal axis, the diameter of the limit pin 4 stuck in the limit groove 6 remains unchanged, and the limit pin 4 will not be stuck in the limit groove 6 when deflected, ensuring the flexibility of the relative movement between the limit pin 4 and the connecting member 5. Thereby avoiding the influence on the expansion and contraction of the temperature core 12, and further avoiding the influence on the measurement accuracy of the thermometer.

[0035] In order to reduce the friction between the transmission shaft 3 and the connecting member 5 and improve flexibility, the lower end of the transmission shaft 3 has a limiter 8, which is spherical, has a diameter greater than the diameter of the transmission shaft 3, and has a clearance fit with the connecting member 5. Since the limiter 8 and the inner wall of the connecting member 5 are in line-surface contact, the friction between the two is reduced and flexibility is improved.

[0036] In order to facilitate the connection between the connector 5 and the connecting wire 11, a limiting hole 9 is provided in the lower section of the connector 5, and a limiting nut 10 is connected to the limiting hole 9 through a thread. When in use, the upper end of the connecting wire 11 is inserted into the inner side of the lower section of the connector 5, and the limiting nut 10 is pressed inwardly to tighten the connecting wire 11, thereby facilitating the fixing of the connecting wire 11.

[0037] Since the diameter of the connecting wire 11 is relatively small, while the diameter of the transmission shaft 3 is relatively large, in order to make the connecting wire 11 coaxial with the transmission shaft 3, the connector 5 has an enlarged diameter section and a reduced diameter section arranged in sequence from top to bottom, the inner diameter of the reduced diameter section is smaller than the enlarged diameter section, the transmission shaft 3 is located in the enlarged diameter section, and the limiting hole 9 is located in the reduced diameter section. Specifically, the inner diameter of the enlarged diameter section is loosely matched with the limiting portion 8, and the inner diameter of the reduced diameter section is loosely matched with the connecting wire 11. The connecting wire 11 is fixed in the reduced diameter section with a smaller diameter, and the inner diameter of the reduced diameter section matches the outer diameter of the connecting wire 11, so that the connecting wire 11 can be coaxial with the connector after being fixed in the reduced diameter section, thereby ensuring that the rotation transmission between the connector and the connecting wire 11 can remain consistent.

[0038] In order to ensure the stability of the transmission shaft 3, the base 1 includes a mounting plate 101, a first wing plate 102 and a second wing plate 103. The mounting plate 101 is arranged vertically, and the first wing plate 102 and the second wing plate 103 are arranged horizontally. The first wing plate 102 and the second wing plate 103 are perpendicular to the mounting plate 101. The first wing plate 102 and the second wing plate 103 are fixedly connected to the front side of the base 1, and the first wing plate 102 is located below the second wing plate 103. The first wing plate 102 and the second wing plate 103 are both provided with a first shaft hole 104, and the transmission shaft 3 is rotatably installed in the two first shaft holes 104. The transmission shaft 3 is constrained by the two first shaft holes 104, so that the transmission shaft 3 can have better stability when rotating.

[0039] The transmission assembly 7 includes a first gear 701 and a second gear 702. The first gear 701 is fixedly connected to the transmission shaft 3, and the second gear 702 is fixedly connected to the pointer shaft 2. The first gear 701 and the second gear 702 are meshed and connected. In order to save installation space, a through hole 109 is opened on the mounting plate 101. The through hole 109 is located between the first wing plate 102 and the second wing plate 103. The gear teeth of the first gear 701 pass through the through hole 109 backwards and mesh with the second gear 702.

[0040] In order to ensure the stability of the rotation of the pointer shaft 2, the base 1 also includes a positioning member 106 and two connecting columns 105, and the rear ends of the two connecting columns 105 are fixedly connected to the left and right ends of the positioning member 106 respectively. Two mounting holes 108 are provided on the mounting plate 101, and the left ends of the two connecting columns 105 are fixedly connected in the two mounting holes 108 respectively. Second shaft holes 107 are provided on the mounting plate 101 and the positioning member 106. The second shaft hole 107 on the mounting plate 101 is located above the second wing plate 103, and the front and rear ends of the pointer shaft 2 are respectively rotated to connect in the two second shaft holes 107. In order to eliminate the gap between the gear teeth of the first gear 701 and the second gear 702, a reset hairspring 13 is fixedly connected to the pointer shaft 2. The reset hairspring 13 is spiral, and the inner end of the spiral of the reset hairspring 13 is a movable end, and the movable end is fixedly connected to the pointer shaft 2. The outer end of the spiral of the reset hairspring 13 is a fixed end, and the fixed end is fixedly connected to the connecting column 105.

[0041] Based on the same design concept, the present application also provides a thermometer, which includes the above-mentioned bimetallic thermometer core, wherein the upper end of the temperature core 12 in the thermometer is fixedly connected to the connecting wire 11, and the upper end of the connecting wire 11 is fixedly connected to the inner side of the lower section of the connecting member 5.

[0042] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0043] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0044] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A bimetallic thermometer movement, characterized in that: include: Machine base (1); A pointer shaft (2) is rotatably mounted on the base (1); A transmission shaft (3) is rotatably mounted on the machine base (1), the transmission shaft (3) is perpendicular to the pointer shaft (2), and a limit pin (4) is provided on the transmission shaft (3), and the limit pin (4) is cylindrical; A connecting member (5), the connecting member (5) is tubular, the lower section of the transmission shaft (3) is inserted into the connecting member (5), the connecting member (5) is provided with a limiting groove (6), and the limiting pin (4) is movably connected in the limiting groove (6); A transmission assembly (7) is mounted on the machine base (1), and transmission is performed between the transmission shaft (3) and the pointer shaft (2) via the transmission assembly (7).

2. A bimetallic thermometer movement as claimed in claim 1, characterized in that: One end of the transmission shaft (3) located inside the connecting piece (5) has a limiting portion (8), the limiting portion (8) is spherical, the diameter of the limiting portion (8) is larger than the diameter of the transmission shaft (3), and the limiting portion (8) is clearance-matched with the connecting piece (5).

3. A bimetallic thermometer movement as claimed in claim 1, characterized in that: A limiting hole (9) is provided at the lower section of the connecting member (5), and a limiting nut (10) is connected to the inner thread of the limiting hole (9).

4. A bimetallic thermometer movement as claimed in claim 3, characterized in that: The connecting piece (5) has an expanded diameter section and a reduced diameter section, the reduced diameter section has an inner diameter smaller than the expanded diameter section, the transmission shaft (3) is located in the expanded diameter section, and the limiting hole (9) is located in the reduced diameter section.

5. A bimetallic thermometer movement as claimed in any one of claims 1 to 4, characterized in that: The transmission assembly (7) comprises a first gear (701) and a second gear (702); the first gear (701) is fixedly connected to the transmission shaft (3); the second gear (702) is fixedly connected to the pointer shaft (2); and the first gear (701) and the second gear (702) are meshingly connected.

6. A bimetallic thermometer movement as claimed in claim 5, characterized in that: The machine base (1) comprises a mounting plate (101), a first wing plate (102) and a second wing plate (103); the first wing plate (102) and the second wing plate (103) are both fixedly connected to the machine base (1); the first wing plate (102) and the second wing plate (103) are both provided with a first shaft hole (104); the transmission shaft (3) is rotatably mounted in the two first shaft holes (104).

7. A bimetallic thermometer movement as claimed in claim 6, characterized in that: The mounting plate (101) is provided with a through hole (109), and the first gear (701) partially passes through the through hole (109).

8. A bimetallic thermometer movement as claimed in claim 7, characterized in that: The through hole (109) is located between the first wing plate (102) and the second wing plate (103).

9. A bimetallic thermometer movement as claimed in claim 1, characterized in that: It also includes a reset hairspring (13), which is spiral-shaped, and the fixed end of the reset hairspring (13) is fixedly connected to the machine base (1), and the movable end of the reset hairspring (13) is fixedly connected to the pointer shaft (2).

10. A thermometer, characterized in that: It comprises a bimetallic thermometer movement as described in any one of claims 1 to 9.

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