JPH0710268Y2 - Bourdon tube thermometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a Bourdon tube type thermometer in which a Bourdon tube is connected to a sector gear for rotating a mounting shaft for a pointer through a temperature compensating bimetal. It is about improvement.

<Prior Art> In a Bourdon tube thermometer, a Bourdon tube installed in the case of the display unit and a temperature sensing unit installed at the measurement location are connected through lead wires, and the Bourdon tube, the temperature sensing unit and the lead are connected. An inert gas such as nitrogen gas is sealed in the wire.

However, in many cases, the Bourdon tube has a larger internal volume than the lead wire and contains a large amount of inert gas, so it is easily affected by the ambient temperature, and the enclosed inert gas affects the ambient temperature. When receiving, an error will occur between the actual temperature measured by the temperature sensing unit and the display temperature displayed on the display unit. Therefore, it is necessary to prevent the enclosed inert gas from being affected by the ambient temperature as much as possible or to be able to correct the generated error.

<Problems to be solved by the invention> The present invention aims to achieve accurate temperature measurement by minimizing the ratio of the inert gas enclosed in the Bourdon tube to the ambient temperature, thereby enabling accurate temperature measurement. It is intended to provide a total.

<Means for Solving the Problem> A Bourdon tube type thermometer of the present invention which achieves such an object is constructed by connecting a Bourdon tube through a temperature compensating bimetal to a sector gear for rotating a mounting shaft for a pointer. In the Bourdon tube type thermometer, the Bourdon tube is formed into a substantially rectangular shape in cross section, and a partition member is press-fitted in the central portion along the inner longitudinal direction of the Bourdon tube so that the inner surface of the Bourdon tube is separated from the partition. It is characterized in that a space formed between the upper and lower ends of the member is filled with an inert gas.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

The Bourdon tube thermometer according to the present invention is basically the same as the conventional one, and a display unit A for displaying the measured temperature,
It is composed of a temperature sensitive part B installed at a measurement place and a lead wire C for connecting the display part A and the temperature sensitive part B.

The display unit A includes a storage case a having a glass lid on the upper surface,
It is composed of a dial b and an internal unit c provided below the dial b. The inner unit c is composed of a Bourdon tube 1 formed in a substantially C-shape in a plane, a sector gear 2 for rotating a mounting shaft 3 for a pointer, and the like. That is, the Bourdon tube 1 is attached to the mounting plate 4 fixed to the inner center of the storage case a via the holder 5, and the Bourdon tube 1
The lead wire C is connected to the base end of the Bourdon tube 1 via the holder 5, and the correction plate 6 attached to the sector gear 2 is connected to the tip end of the Bourdon tube 1 via the temperature correction bimetal 7 for the pointer. A pointer s is attached to the mounting shaft 3 for construction.

The Bourdon tube 1 is formed into a hollow tube having a substantially rectangular cross section by using bellows copper, and a partition member 8 is press-fitted in the central portion along the inner longitudinal direction of the tube to partition the inner surface of the Bourdon tube 1. An inert gas such as nitrogen gas is filled in the spaces 9a and 9b formed between the upper and lower ends of the member 8.

The partition member 8 is made of a material such as neoprene rubber or Teflon resin and is formed into a rectangular cross section having a width slightly shorter than the vertical width of the inside of the Bourdon tube 1, and is press-fitted and installed in the inside of the Bourdon tube 1 over almost the entire length. is there.

<Effect of the Invention> The Bourdon tube thermometer of the present invention is thus a space formed between the upper and lower ends of the partition member press-fitted along the inner longitudinal direction of the Bourdon tube and the inner surface of the Bourdon tube. Since the inert gas is sealed in the part, the internal volume of the inert gas in the Bourdon tube can be significantly reduced compared to the conventional one, and therefore the inert gas sealed in the Bourdon tube can reach the ambient temperature. The affected rate can be significantly reduced, resulting in more accurate temperature measurements.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention, and FIG.
The drawing is an enlarged sectional view taken along the line I-I of FIG. In the figure 1: Bourdon tube, 2: Sector gear 3: Mounting shaft for pointer, 7: Bimetal for temperature compensation 8: Partition member, 9a, 9b: Space part

Claims (1)

[Scope of utility model registration request] 1. A Bourdon tube thermometer in which a Bourdon tube is connected to a sector gear for rotating a mounting shaft for a pointer through a temperature compensating bimetal, and the Bourdon tube is formed into a substantially rectangular cross section. , A partition member is press-fitted in the central portion along the inner longitudinal direction of the Bourdon tube,
A Bourdon tube type thermometer characterized in that an inert gas is filled in a space formed between the inner surface of the Bourdon tube and the upper and lower ends of the partition member.