JPH0722165A - Glass tube heater - Google Patents

Abstract

PURPOSE:To provide a glass tube heater with the heat emission temp. made uniform through adoption of a simple configuration. CONSTITUTION:A glass tube heater 1 is composed of a glass tubing 2, a coil- form resistance wire 3 inserted into the glass tubing 2, and a terminating member 4 connected with each end of the glass tubing 2. The resistance wire winding pitches at the end parts are made denser than in the central part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass tube heater used for defrosting a cooler in a refrigerator or the like.

[0002]

2. Description of the Related Art Conventionally, a glass tube heater of this type has a filament, which is a heating structure wound in a coil shape along the tube axis, in a glass bulb, and the filament is formed into an annular shape at a plurality of positions. In general, the support ring holds the glass bulb on the tube axis, and both ends of the glass bulb are crushed to form a sealing portion, and the lead wire is led out from the sealing portion. Is. When a deodorizing function is added to the glass tube heater, the deodorizing catalyst is applied to the outer surface of the glass bulb.

[0003]

However, the heating structure of the conventional glass tube heater is uniformly wound in a coil shape along the tube axis direction of the glass bulb.
Since the sealed portions at both ends cannot be formed into a coil shape because they are connected to the lead wires, the amount of heat generated is different between the central portion and the portions on both end sides. For this reason, the overall heat generation temperature becomes non-uniform, and when this is used for defrosting the cooler,
There are problems that the defrosting efficiency becomes low and the deodorizing catalyst layer applied to the outer surface of the glass bulb deteriorates.

Therefore, for example, Japanese Patent Laid-Open No. 4-297268
In the heating device shown in Japanese Patent Publication (A61L9 / 00),
Both ends of a metal structure in which a deodorizing catalyst in which a platinum catalyst is mixed in a porous material are applied are attached to metal supporting members. However, such a heating device has a problem that the structure is complicated and the manufacturing cost is increased.

The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide a glass tube heater having a uniform heat generation temperature with a simple structure.

Another object of the present invention is to add a deodorizing function by forming a deodorizing catalyst layer on the glass tube heater and to reduce deterioration of the deodorizing catalyst layer.

[0007]

A glass tube heater 1 according to the present invention comprises a glass tube 2, a coil-shaped resistance wire 3 inserted into the glass tube 2, and both ends of the glass tube 2. It is composed of the terminal members 4 and 4 connected to each other, and the winding pitch on both ends of the resistance wire 3 is made denser than that in the central portion.

Further, the glass tube heater 1 according to the invention of claim 2
In addition to the above, the deodorizing catalyst layer 9 is formed on the outer circumference of the glass tube 2.

[0009]

According to the glass tube heater 1 of the invention of claim 1,
The coiled resistance wire 3 inserted inside the glass tube 2 is
Since the both end sides are denser than the central part, the calorific value on both end sides can be made larger than that on the central part, thereby compensating for the calorific value on both end parts which cannot be coiled. Therefore, it is possible to eliminate the difference in heat generation amount between the both end portions and the central portion, and it is possible to make the heat generation temperature of the glass tube heater 1 uniform as a whole.

Further, the glass tube heater 1 according to the invention of claim 2
According to this, since the deodorizing catalyst layer 9 is formed on the outer periphery of the glass tube 2 in addition to the above, when used for defrosting a refrigerator or the like, it is possible to deodorize the cool air flowing around the glass tube heater 1. In addition to the above, the heat generation temperature of the glass tube heater 1 becomes uniform as a whole as described above, so that the deterioration of the deodorizing catalyst layer 9 is also reduced.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is an enlarged vertical sectional front view of an end portion of a glass tube heater 1 of the present invention, FIG. 2 is a partially cutaway front view of the glass tube heater 1 of the present invention, and FIG. 3 is a sectional view taken along the line AA of FIG. In each drawing, reference numeral 1 denotes a glass tube heater, which is arranged near the cooler for defrosting the cooler such as a refrigerator. Reference numeral 2 denotes a glass tube, which is formed by forming quartz glass into a long cylindrical shape. In the glass tube 2, a resistance wire 3 wound in a coil shape along the tube axis direction is installed, and the resistance wire 3 is provided at a plurality of positions with an annular support ring (not shown), It is held on the tube axis of the glass tube 2.

Terminal members 4, 4 made of an insulating material such as rubber are attached to both ends of the glass tube 2, and a passage 6 through which a lead wire 5 is inserted is provided in each of the terminal members 4, 4. Are formed respectively. Each lead wire 5 and 5 is connected to the resistance wire 3 at one end, and the other end is provided with a coupler 8 for connecting to a power source (not shown).

Further, the resistance wire 3 laid in the glass tube 2 has a sparse winding pitch in the range of B in the central portion, and the resistance wires 3 are connected to the lead wires 5 and 5 in the terminal members 4 and 4. The range D at both ends to be connected is not wound as in the conventional case. On the other hand, in the range C on both ends of the range B located between the ranges B and D, the winding pitch thereof is rapidly changed and becomes dense as shown in FIG.

On the other hand, a deodorizing catalyst layer 9 is provided on the outer circumference of the glass tube 2.
Are formed. The deodorizing catalyst layer 9 is made of zeolite,
Composed of alumina, silica, precious metals and rare earth oxides, vegetables stored in refrigerators, methyl mercaptan which is a rotten odor generated from fruits, trimethylamine which is an odor generated from meat and fish, and odor generated from fermented foods. It has the property of adsorbing certain fatty acids. For precious metals and rare earth oxides, the odorous components adsorbed are + 250 ° C.
It functions as a catalyst for oxidizing and purifying at the above temperature.

The glass tube heater 1 having the above structure is arranged near the cooler of the refrigerator (not shown). Therefore, the circulating cold air ventilated through the cooler is also circulated around the glass tube heater 1, but various odorous components in the cold air are adsorbed by the deodorizing catalyst layer 9 as described above, so that the refrigerator is deodorized. To be done. Then, when the cooler is defrosted, the resistance wire 3 is energized to generate heat with a predetermined capacity (W / m) per unit length, but since it is not wound in the range D as described above, its substantial length Is shorter, and the amount of heat generated is significantly smaller than that in the range B.

However, since the winding pitch of the range C on both sides of the range B is made dense and the substantial length is extended,
The calorific value is larger than in the range B. Thereby,
It is possible to compensate for the heat generation amount in the range D at both ends that cannot be formed into a coil shape, eliminate the difference in heat generation amount between both end portions and the central portion, and make the heat generation temperature of the glass tube heater 1 substantially uniform as a whole. Therefore, the cooler can be heated uniformly and defrosting can be efficiently performed in a short time.

Since the winding pitch of the resistance wire 3 is drastically changed in the above embodiment, when the width of the cooler is larger than that of the glass tube heater 1, the cooler without the glass tube heater 1 exists. It is possible to effectively heat both side parts and to heat them substantially uniformly as a whole, but not limited to that,
For example, as shown in FIG. 5, the winding pitch of the resistance wire 3 may be gradually increased from the central portion toward both side portions. in this case,
Particularly, it is effective for uniform heating of the cooler when the width of the cooler and the length of the glass tube heater 1 are the same or the length of the glass tube heater 1 is longer.

Further, when the resistance wire 3 heats up and the temperature of the deodorizing catalyst layer 9 rises above + 250 ° C., the noble metal and rare earth oxide in the deodorizing catalyst layer 9 oxidize and purify the adsorbed odorous components as described above. Therefore, the deodorizing ability of the deodorizing catalyst layer 9 is activated again. Also in this case, in the present invention, since the heat generation temperature of the resistance wire 3 is made uniform as described above, the deterioration of the deodorization catalyst layer 9 due to the uneven temperature distribution is suppressed.

In the embodiment, the glass tube heater 1 is used for defrosting the refrigerator cooler. However, the invention is not limited to this. For example, an oven toaster or the like is extremely effective. In that case. It is possible to shorten the heating time of food.

[0020]

As described above in detail, according to the invention of claim 1, the coiled resistance wire inserted into the inside of the glass tube is
Since the both end sides are denser than the central part, the calorific value on both end sides can be made larger than that on the central part, and the calorific value on both end parts which cannot be formed into a coil shape can be compensated. Therefore, it is possible to eliminate the difference in heat generation amount between the both end portions and the central portion and make the heat generation temperature of the glass tube heater uniform as a whole.

According to the invention of claim 2, in addition to the above, a deodorizing catalyst layer is formed on the outer periphery of the glass tube, so that when it is used for defrosting a refrigerator or the like, it flows around the glass tube heater. In addition to being able to deodorize the cool air, the heat generation temperature of the heater becomes uniform as described above, so that the deterioration of the deodorizing catalyst layer is reduced.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional front view of an end portion of a glass tube heater of the present invention.

FIG. 2 is a partially cutaway front view of the glass tube heater of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a diagram showing a state of a winding pitch of a resistance wire.

FIG. 5 is a diagram showing a state of a winding pitch of a resistance wire of another embodiment.

[Explanation of symbols]

 1 Glass tube heater 2 Glass tube 3 Resistance wire 4 Terminal member 9 Deodorizing catalyst layer

Claims (2)

[Claims] 1. A glass tube heater comprising a glass tube, a coil-shaped resistance wire inserted into the glass tube, and terminal members connected to both ends of the glass tube. A glass tube heater characterized in that the winding pitch of is made denser than that in the central portion. 2. The glass tube heater according to claim 1, wherein a deodorizing catalyst layer is formed on the outer circumference of the glass tube.