JPH0249549Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention uses a red organic liquid as the temperature-sensitive liquid, and displays the internal temperature of a refrigerated open case by illuminating it with a fluorescent light. This invention relates to a glass rod-shaped thermometer used for.

[Prior art and its problems]

As shown in FIG. 1, in the refrigerated open case, a cold air circulation path 3 is formed in the main body case 1 along with a refrigerator interior 2 so as to go around the refrigerator interior 2. The fan 4 circulates the air inside the refrigerator through the cooler 5.
The cooled air forms a cold air curtain in the opening 1a for taking out products, and also flows through the warehouse interior 2 to cool and keep the products stored and displayed in the warehouse 2 cold. At the upper front edge of the main body case 1, a temperature sensing part 61 is provided.
A fluorescent lamp 7 is provided which illuminates the refrigerated open show case and its surroundings, and which illuminates the display section 62 from behind so that the temperature of the thermometer 6 can be easily seen.

FIGS. 2 and 3 show the thermometer 6, in which the temperature-sensing part 61 is filled with a red-colored organic liquid as a temperature-sensitive liquid, and is connected to the inside by a flexible metal tube 63. It is connected to a glass tube 64 having a capillary tube. The display section 62 is constructed by fixing the glass tube 64 inside a case 66 that has an open back and a transparent scale plate 65 attached to a window on the front.

In the thermometer 6, the temperature-sensitive liquid in the temperature-sensing portion 61 expands in response to the temperature inside the refrigerator 2, and moves up and down within the capillary tube of the glass tube 64 communicated via the flexible tube 63.
The height of this temperature-sensitive liquid 68 is indicated on the scale plate 65, and the temperature inside the refrigerator is indicated. The temperature can be easily displayed by illuminating the glass tube 64 and scale plate 65 from behind by the fluorescent lamp 7 through the open back surface of the case 66.

However, conventional thermometers have the disadvantage that the red colored organic liquid fades when exposed to the light of a fluorescent lamp, causing the temperature display to lose its sharpness relatively quickly.

[Purpose of invention]

The purpose of this invention is to provide a glass rod-shaped thermometer that displays temperature clearly for a long time without discoloring the temperature-sensitive liquid even after long use.

[Key points of the idea]

This idea protects the temperature-sensitive liquid with a transparent shield that hardly transmits ultraviolet rays, thereby preventing discoloration.

[Example of idea]

In the drawings of the embodiment, parts common or identical to those in FIGS. 1 to 3 are designated by the same reference numerals.

Figure 4 shows an embodiment of this invention, 8A
is a shielding plate having a U-shaped cross section and fitted to the side wall of the case 66 so as to form the back surface thereof. This shielding plate 8A is made of a transparent synthetic resin plate manufactured by Kyocera, which is made of polycarbonate with a special component and hardly allows expansion to pass through.

In the above-mentioned configuration, most of the ultraviolet rays from the fluorescent lamp 7 irradiated from the rear of the case 66 to the red-colored organic liquid serving as the temperature-sensitive liquid 68 in the glass tube 64 are blocked by the shielding plate 8A. It's blocked out. Therefore, the temperature-sensitive liquid 68 discolors, and the temperature-sensitive liquid 68 of the thermometer 6 clearly indicates the temperature for a long time.

FIG. 5 shows another embodiment, which differs from the previous embodiment in that a shielding tube 8B made of the same material as the shielding plate is attached to a glass tube 64, and a temperature-sensitive liquid 68 is applied thereto. It has the same effect as the previous embodiment in that it protects from the ultraviolet rays of the fluorescent lamp 7.

In addition to the embodiments shown in FIGS. 4 and 5, this invention can also be applied to thermometers in which the temperature-sensing section 61 is formed integrally with the glass tube 64, or in which a temperature scale is attached to the surface of the glass tube. It is possible and the same effect can be obtained.

[Effect of idea]

According to this invention, a transparent shield is provided to shield the temperature-sensitive liquid that indicates the temperature from ultraviolet rays, so that the temperature-sensitive liquid is prevented from fading and the thermometer remains constant even after long periods of use. Displays clear temperature.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a refrigerated open case in which the thermometer is used, Figure 2 is a front view of a conventional thermometer, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a sectional view of the conventional thermometer. A sectional view corresponding to FIG. 3 of the embodiment of the invention, and FIG. 5 a sectional view of a different embodiment. 6... Thermometer, 64... Glass tube, 68... Temperature sensitive liquid, 7... Fluorescent lamp, 8A... Shielding plate, 8B...
Shielding tube.

Claims (1)

[Scope of utility model registration request] A glass rod-shaped thermometer in which a colored organic liquid is used as a temperature-sensitive liquid that indicates the temperature in a glass tube according to the degree of expansion corresponding to the temperature, and a transparent shielding member for shielding the temperature-sensitive liquid from ultraviolet rays. A glass rod-shaped thermometer characterized by comprising: