Fusible alloys and fusible plugs

Abstract

The invention provides a fusible alloy and a fusible plug, the components and corresponding mass percentages of which are: In: 8-10 parts; Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.5%, meeting the requirements of lead-free directives such as Rohs and the requirements of operating temperature.

Description

Technical Field

[0001] The invention relates to the field of fusible alloys and air-conditioning safety devices, and in particular to a fusible alloy and a fusible plug. Background Art

[0002] Fusible alloy, also known as low melting point alloy, is an alloy made of bismuth, lead, tin and cadmium. It is widely used as solder, as well as fuses, fuses and other heat-sensitive components in electrical appliances, fire protection, fire alarm and other devices. It is a new type of low melting point alloy material with great development potential. At present, the chemical composition of the fusible alloy used in the fusible plug disclosed in 201620612025.1 of the air conditioner is mainly based on tin, and some low melting point components are added: such as bismuth, indium, antimony, lead, zinc, etc., and various melting point alloys are configured through appropriate component ratios. However, with the issuance of lead-free directives such as Rohs, non-environmentally friendly components such as Pb are strictly prohibited from use, so it is necessary to develop a series of lead-free fusible alloys to replace lead-containing alloys. Summary of the invention

[0003] In order to overcome the above defects in the prior art, the present invention provides a fusible alloy and a fusible plug, which meet the requirements of lead-free directives such as Rohs and the requirements of operating temperature.

[0004] A fusible alloy, the components and corresponding mass percentages of which are: In: 8 to 10 parts;

[0005] Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.5%.

[0006] In some embodiments, a fusible alloy has the following components and mass percentages: In: 8-10 parts; Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.9%.

[0007] In some embodiments, a fusible alloy has the following components and mass percentages: In: 8.5-9.5 parts; Sn: 39.5-40.5 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.9%.

[0008] The melting point of the above fusible alloys is 92℃~98℃.

[0009] In some embodiments, a fusible plug is provided, which is formed from the above fusible alloy.

[0010] The fusible alloy and fusible plug of the present invention have the following components and corresponding mass percentages: In: 8-10 parts; Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.5%, meeting the requirements of lead-free directives such as Rohs and the requirements of operating temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the fusible plug structure of the present invention. DETAILED DESCRIPTION

[0012] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0013] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0014] The following examples describe embodiments of the present invention.

[0015] Please combine Figure 1 This embodiment provides a fusible plug, wherein the fusible plug body 1 is provided with an axial step through hole 2, and the end section of the through hole 2 is filled with a fusible alloy 3, and the melting temperature range of the fusible alloy 3 is 92°C to 98°C.

[0016] First, the purity of the single metal ingots of In, Sn and Bi used in the experiment was tested. The purity of the single metal ingots of In, Sn and Bi was 99.99%, 99.9% and 99.99% respectively. The impurity content of the formed alloy was estimated to reduce the cost of multiple impurity content tests.

[0017] Embodiment 1: fusible alloy, In: 9.1 parts; Sn: 40 parts; the balance is Bi; wherein, the lead content is tested to be no more than 0.05%, and the individual contents of other impurities such as cadmium, arsenic, antimony, zinc, iron, aluminum, copper, silver, etc. are tested to be no more than 0.005%, the purity of the alloy is no less than 99.9%, and the melting point of the fusible alloy is tested multiple times to be 94-96°C.

[0018] Example 2: Fusible alloy, In: 8 parts; Sn: 39 parts; the balance is Bi; the melting point of the fusible alloy was tested multiple times and the results were 96-97.7°C. In addition to this example, in order to test the effect of Sn content on the melting point, Sn was increased to 41 parts, and the other components were unchanged. There was no obvious difference in the melting point test results of the fusible alloy, which is estimated to be due to the accuracy of the melting point measurement.

[0019] Example 3: Fusible alloy, In: 10 parts; Sn: 40 parts; the balance is Bi; the melting point of the fusible alloy was tested multiple times and the results were 92.4-94.5°C. In addition to this example, in order to test the effect of Sn content on the melting point, Sn was increased to 41 parts, and the other components were unchanged. There was no obvious difference in the melting point test results of the fusible alloy, which is estimated to be due to the accuracy of the melting point measurement.

[0020] In addition, the content limit ranges of the fusible alloy In: 8.5-9.5 parts, Sn: 39.5-40.5 parts, and the balance Bi were tested, and it was found that the melting point of the fusible alloy was roughly in the range of 93-96.3°C, which met the stable requirement of the melting point range of the fusible plug being 92°C-98°C. Except for Example 1, the purity of the alloy was not measured, but the alloy was manufactured and tested with the same equipment, and it was estimated that the purity was not less than 99.9%. Considering that the alloy manufacturing equipment contaminated the alloy to a certain extent, according to the usage practice of the equipment, the purity of the alloy was not less than 99.5% when manufactured in large quantities.

[0021] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fusible alloy, characterized in that: The components and corresponding mass percentages are: In: 8-10 parts; Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.5%.

2. The fusible alloy according to claim 1, characterized in that: The components and mass percentages thereof are: In: 8-10 parts; Sn: 39-41 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.9%.

3. The fusible alloy according to claim 2, characterized in that: The components and mass percentages thereof are: In: 8.5-9.5 parts; Sn: 39.5-40.5 parts; the balance is Bi; wherein the purity of the alloy is not less than 99.9%.

4. The fusible alloy according to claim 1, 2 or 3, which has a melting point of 92°C to 98°C.

5. A fusible plug, characterized in that: It is formed from the fusible alloy described in claim 1, 2 or 3.

Images