JPS598178Y2 - Bearing temperature detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing temperature detection device in which a temperature detection end is attached to a bearing portion, and particularly relates to a bearing temperature detection device for a bearing that performs forced lubrication.

In order to prevent bearings used in turbo compressors and the like from burning out, a bearing temperature detection device has conventionally been provided to monitor the condition of the bearings.

Conventional bearing temperature detection devices generally measure the exhaust temperature of bearing lubricating oil.

However, since this method indirectly measures the temperature of the bearing, it has the disadvantage of large errors and time delays.

Therefore, recently, a system has been adopted in which a temperature detection end is attached directly to the bearing part to directly measure the temperature of the bearing metal and monitor the condition of the bearing.

This method allows the bearing temperature to be measured directly, so it is excellent for monitoring because there is little error and little time delay.

However, this method has the following drawbacks.

That is, for example, when using white metal WJ2B for high speed and high load as the bearing metal, first attach the temperature detection end to the mounting hole drilled through the bearing part and the bearing metal, and then WJ2B on the surface
is fused to form the same plane as the bearing surface,
Since the melting temperature of this WJ2B exceeds 400° C., it is necessary to use a temperature detection terminal such as a resistance temperature detector (hereinafter referred to as RTD) that can withstand this high temperature.

However, RTDs with a heat resistance temperature of 400° C. or higher generally have poor characteristics (linearity) near normal operating temperatures (about 100° C.) and cannot be used.

An RTD with good characteristics at around 100℃ has a heat resistance temperature of about 30℃.
It is 0°C.

The present invention has been developed in consideration of the above-mentioned problems, and is designed to directly measure the temperature of the bearing metal by attaching the temperature detection end directly to the bearing.It has good characteristics near the normal operating temperature. The purpose of this device is to provide a bearing temperature detection device in which a temperature detection end can be used. A protective metal having a melting point lower than the allowable temperature limit of the temperature sensing end is fused to the surface of the temperature sensing end, and a bearing metal is fused to the surface of this protective metal.

Hereinafter, embodiments of the bearing temperature detection device of the present invention will be described in more detail with reference to the drawings.

As shown in the figure, a bearing metal 2 is fused to the bearing surface of a bearing portion (bearing pad) 1. As shown in FIG.

As the material of the bearing metal 2, white metal WJ2B for high speed and high load is used.

A mounting hole 3 is bored through the bearing portion 1 and the bearing metal 2, and a temperature detection end 4 is mounted near the bearing surface of the mounting hole 3.

This temperature detection terminal 4 is normally used at a temperature of about 100°C.
An RTD with good characteristics and a heat resistance temperature of around 300°C is used.

A protective metal 5 having a melting point lower than the allowable temperature limit is fused to the surface of the temperature detecting end 4. In this embodiment, the protective metal 5 is a white metal WJ9 having a melting point lower than the allowable temperature limit of the temperature detecting end 4. (melting point approximately 250°C).

The material WJ9 also has the property that physical properties such as thermal conductivity and yield strength are not much different from WJ2B.

A bearing metal 2' made of the same material as the bearing metal 2 (WJ2B in this example) is further fused to the surface of the protective metal 5, and the surface of this bearing metal 2' becomes flush with the bearing surface of the bearing metal 2. The surface finishing is done as follows.

When welding the bearing metal 2' to the surface of the protective metal 5,
Even if the temperature of the bearing metal 2' (WJ2B) exceeds 400℃, the protective metal (WJ9) with a lower melting point than that temperature
) 5 has a temperature gradient in the thickness direction, so only the surface of the protective metal 5 melts, and this protective metal 5 prevents the temperature detection end 4 from rising above its heat resistant temperature (approximately 300°C). Thus, the temperature detection end 4 can be protected.

Moreover, since the temperature detection end 4 is one with a heat resistance temperature of about 300°C, the normal operating temperature (about 100°C) is used.
The bearing temperature can be detected accurately and without time delay.

In the above embodiment, the protective metal 5 is provided from the surface of the temperature detection end 4 to the bearing surface of the bearing metal 2, and the bearing metal 2' is not provided, that is, the protective metal (
WJ 9) It is also possible to increase the number of items in 5, but
With such a structure, even if the temperature of the bearing metal 2 during operation is within the normal operating temperature of 120°C, for example, a part of the protective metal 5 may melt and cave in, so that it cannot be used as a bearing. performance deteriorates and cannot be adopted.

As explained above, in the bearing temperature detection device of the present invention, a temperature detection end is attached to the bearing part, a protective metal having a melting point lower than the heat-resistant temperature of the temperature detection end is fused to the surface of the temperature detection end, and this protective metal Since the bearing metal is fused to the surface of the bearing, it is possible to select and use a temperature detection end with good characteristics near the normal operating temperature, and the bearing temperature can be detected accurately and without time delay. The effect is that it can be done.

In the embodiment of the device of the present invention described above, WJ2B is used as the bearing metal, WJ9 is used as the protective metal, and an RTD with a heat resistance of about 300°C is used as the temperature detection terminal, but these are not necessarily used. Of course, there is no limit.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the bearing temperature detection device of the present invention. 1... Bearing part (bearing pad), 2, 2'...
...Bearing metal, 3...Mounting hole, 4...
...Temperature detection end (resistance temperature detector (RTD)), 5...
・Protective metal.

Claims (4)

[Scope of utility model registration request] 1. The temperature sensing end is installed in the mounting hole drilled through the bearing and the bearing metal, and a protective metal with a melting point lower than the heat-resistant temperature of this temperature sensing end is fused to the surface of the temperature sensing end. A bearing temperature detection device characterized by having a bearing metal fused to the surface of the bearing. 2. A bearing temperature detection device according to claim 1, characterized in that a resistance temperature detector (RTD) is used as a temperature detection terminal. 3. The bearing temperature detection device according to claim 1 or 2, characterized in that a white metal is used as the bearing metal and a different type of white metal is used as the protective metal. 4. The scope of the utility model registration claim consists of using an RTD with a heat resistance temperature of approximately 300℃ as the temperature detection end, using WJ2B (white metal) as the bearing metal, and using WJ9 (different type of white metal) as the protective metal. The bearing temperature detection device according to item 2 or 3.