JP2568091Y2 - Indicator of electric bearing monitor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor for electrically detecting the degree of wear of a bearing, and more particularly to an indicator for an electric bearing monitor capable of simply and appropriately detecting the degree of wear of a bearing such as a canned motor pump. Regarding improvement.

[0002]

2. Description of the Related Art In general, canned motor pumps are completely leak-free because the rotating part is completely placed in the liquid to be handled, and there is no movable part penetrating between the liquid contact part and the outside. Can be realized, and the problems of leakage of the handling liquid and suction of the outside air are completely solved, and the process pump has an excellent advantage.

[0003] However, the canned motor pump is
Although it is configured to receive both the radial load and the thrust load generated by the rotating motion with the bearing,
Since the bearing is lubricated by the handling liquid and the handling liquid and other use conditions are various, the bearings are also in various wear states.

[0004] Therefore, it is difficult to set the service life of the bearing in advance, and once incorporated into a plant, it is impossible to know the state of wear of the bearing unless it is at the time of periodic inspection or failure. It is possible.

Thus, for example, during operation of the pump,
If the bearings wear beyond the allowable radial wear limit, there is a risk that after a relatively short time the stator and rotor cans will come into contact and damage the cans. Also,
Similarly, if the bearings wear beyond the permissible wear limit in the thrust direction, there is a risk that after a relatively short time the impeller will come into contact with the casing or the liner disc and break them. Further, when the wear of the bearing proceeds in this way, the lubricating liquid does not spread to the inner peripheral portion of the bearing, which promotes the radial wear of the bearing.

From such a viewpoint, conventionally, as means for detecting the degree of wear of this type of bearing, for example, a plurality of detection coils are arranged at a predetermined angle away from an iron core of an AC rotating electric machine, and these detection coils are connected in series. There is known an electric bearing monitor configured to detect the degree of wear of the bearing by detecting the induced voltage (Japanese Patent Publication No. 60-52654).

That is, as shown in FIG. 3, this type of electric bearing monitor has three detection coils 10 and 1.
2 and 14 are wound around the iron core of the stator 16 of the AC rotating electric machine and are spaced apart from each other at a space angle of about 120 °, and these detection coils 10, 12 and 14 are output terminals 18, 19, 20 and 21 respectively. , 22, and 23, and an AC voltmeter 24 is connected to a series connection circuit of the detection coils to display a combined voltage of the detection coils. However, the voltage value indicated by the AC voltmeter 24, the axis O ₂₆ of the rotor 26 of the AC rotary electric machine is indicated as a value corresponding to the deviation amount between the axis O ₁₆ of the stator 16.

[0008]

However, since an AC voltmeter is usually used as the indicator in the above-mentioned electric bearing monitor, the indicator is only used when the canned motor pump is operating, as shown in FIG. (A),
As shown in (b), the normal operating state and the state in which the bearing needs to be checked are shown in correlation with the combined voltage values of the detection coils. However, when the canned motor pump stops operating, the indicator is not energized. Therefore, even if the pump is in operation, for example, in the state shown in FIG. The operation is stopped as shown in c).

For this reason, even if the plant operation monitor performs a round inspection, the bearing monitor can be inspected only when the canned motor pump is operating. Therefore, even if the bearing monitor indicates a malfunction, it is highly likely that the discovery is overlooked. In addition, when the bearing wear becomes abnormal and the canned motor pump is stopped, if the operation of the pump is stopped without recording the indicated value of the indicator, information on the degree of wear of the bearing corresponding to the indicated value of the indicator is obtained. However, this is inconvenient in recording maintenance inspection data as data and utilizing it. In this case, there is a method of recording the output voltage of the detection coil on a recorder. However, not only the number of equipment for the bearing monitor increases, but also the cost increases, and the maintenance and inspection work becomes complicated.

Therefore, an object of the present invention is to apply a composite voltage obtained by a plurality of detection coils arranged at a predetermined angle to an iron core of an AC rotating electric machine to a resistor disposed on a display unit of an indicator. An irreversible temperature coloring material that produces color at a predetermined temperature is attached to the resistor, and the coloration allows a simple and reliable display of the state of change in the composite voltage that correlates with bearing wear. It is an object of the present invention to provide an electric bearing monitor indicator which can be easily recorded and held.

[0011]

In order to achieve the above object, an indicator for an electric bearing monitor according to the present invention is provided.
A plurality of detection coils are arranged at a predetermined angle apart from the iron core of the AC rotating electric machine, and these detection coils are connected in series to obtain a composite voltage, thereby detecting the degree of wear of the bearing and displaying this. In the indicator of the type bearing monitor, a resistor for applying the composite voltage is arranged on a display portion of the indicator, and an irreversible temperature coloring material is applied or affixed to the resistor and applied to the resistor. The present invention is characterized in that the degree of wear of the bearing is determined based on a change in color of the coloring material attached to the resistor which generates heat in proportion to the magnitude of the voltage.

In the indicator of the electric bearing monitor, the resistor arranged on the indicator of the indicator is constituted by a plurality of resistor pieces connected in series and arranged in series. A color developing material having a different coloring temperature is applied or affixed, and the state of the degree of wear of the bearing is determined based on the position of each resistor piece where the coloring material attached to each resistor piece develops a color. it can.

[0013]

According to the indicator of the electric bearing monitor according to the present invention, the detection voltage of the composite voltage obtained in correlation with the degree of wear of the bearing is obtained by the plurality of detection coils arranged at a predetermined angle away from the iron core of the AC rotating electric machine. By causing the change to generate heat through the resistor, and by changing the color of the irreversible temperature coloring material attached to the resistor according to the heat generation temperature, it is possible to easily and reliably determine the wear state of the bearing. it can.

The irreversible temperature coloring material used in the present invention is, for example, imported and sold by Western Trading Co., Ltd. in connection with the manufacture of Tempil Division Big Three Industries, Inc., USA. Temperature-indicating paint consisting of the product names "Tempirac" and "Tempirabel"
103 types up to 1371 ° C) and temperature monitor (38
50 to 316 ° C).

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an indicator for an electric bearing monitor according to the present invention.

FIG. 1 is a schematic diagram showing an embodiment of the indicator of the electric bearing monitor of the present invention. That is, in FIG. 1, reference numerals 30, 32, and 34 indicate detection coils, respectively, and these detection coils 30, 32, 3
Reference numeral 4 is wound around the iron core of the stator 36 of the canned motor portion at a space angle of approximately 120 °, similarly to the conventional electric bearing monitor. The output terminals of the detection coils 30, 32, and 34 are connected in series, and both terminals 38 and 40 are connected to the display unit 4 of the indicator 42.
4 is connected to the resistor 46.

However, the resistor 46 disposed on the display section 44 of the indicator 42 has, for example, four resistor pieces 46.
a, 46b, 46c, and 46d or four divided pieces 46a, 46b, 46c, and 46d of the resistor 46. For each of these resistor pieces, 2V, 4V,
Temperature coloring materials 48a, 48b, 48 each having a temperature characteristic of performing coloring at a heat generation temperature by an applied voltage of 6V and 8V.
c or 48d is applied or affixed as shown in FIG. In this case, the respective temperature coloring materials 48a, 48b, 48
[Safety], [Caution], [Danger], [Operation stop], etc. are sequentially displayed for each resistor piece to which c and 48d are attached.

According to the indicator of the electric bearing monitor of this embodiment constructed as described above, the indicator is correlated with the combined voltage of the detection coils 30, 32, and 34 which is increased and output in proportion to the degree of wear of the bearing. Each resistor piece 46a, 46b, 46c, 4 of the resistor 46 disposed on the display 44 of the indicator 42
Temperature coloring materials 48a, 48b, 48c, 4 attached to 6d
8d is selectively changed in color, whereby the degree of wear of the bearing can be easily determined. That is, depending on the positions of the resistor pieces 46a, 46b, 46c, and 46d to which the temperature-colored materials 48a, 48b, 48c, and 48d whose color has changed are attached, [safety], [attention], [danger], The determination of [operation stop] can be promptly achieved, and a record of the state can be surely stored.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many modifications and changes can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, as the temperature coloring material that adheres to each of the plurality of resistor pieces, one having a temperature characteristic of performing color development at different temperatures is used, but by changing the resistance value of each resistor piece. In response to a change in the combined voltage applied to the resistor 46, the state of heat generation of each resistor piece can be changed, so that the timing of color development even when temperature coloring materials having the same temperature characteristics are used. Is changed, it is possible to easily and reliably determine the wear state of the bearing in the same manner as in the above embodiment.

[0020]

As described above, according to the indicator of the electric bearing monitor according to the present invention, a plurality of detection coils are arranged at a predetermined angle away from the iron core of the AC rotating electric machine,
In an indicator of an electric bearing monitor configured to detect the degree of wear of the bearing by connecting these detection coils in series to obtain a combined voltage and to display the degree of wear,
A resistor for applying the combined voltage is arranged on the display unit of the indicator, and an irreversible temperature coloring material is applied or affixed to the resistor, and is proportional to the magnitude of the voltage applied to the resistor. With the configuration in which the degree of wear of the bearing is determined based on a change in color of the coloring material attached to the resistor that generates heat, confirmation of the degree of wear of the bearing and record keeping of the state can be easily, reliably, and reduced. Cost can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an indicator of an electric bearing monitor according to the present invention.

FIG. 2 is a sectional view of a main part of a display unit of the indicator shown in FIG.

FIG. 3 is a schematic configuration diagram of a conventional electric bearing monitor.

FIGS. 4A to 4C are explanatory diagrams respectively showing a configuration and a display example of a display unit of a conventional indicator of a bearing monitor.

[Explanation of symbols]

 30, 32, 34 Detection coil 36 Stator 38, 40 Output terminal 42 Indicator 44 Display unit 46 Resistor 46a, b, c, d Resistor piece 48a, b, c, d Temperature coloring material

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of detection coils are arranged at a predetermined angle apart from an iron core of an AC rotating electric machine, and these detection coils are connected in series to obtain a composite voltage, thereby detecting a degree of wear of a bearing and displaying it. In the indicator of the electric bearing monitor configured to perform, the resistor for applying the combined voltage is arranged on the display of the indicator, and an irreversible temperature coloring material is applied or affixed to the resistor, An instruction for an electric bearing monitor, wherein the degree of wear of the bearing is determined based on a change in color of the coloring material attached to the resistor which generates heat in proportion to the magnitude of the voltage applied to the body. Total. 2. A resistor arranged on a display unit of an indicator, wherein a plurality of resistor pieces are sequentially connected and arranged in series, and a temperature coloring material which is irreversible and has a different coloring temperature from each of said resistor pieces. 2. The electric bearing monitor according to claim 1, wherein the state of the degree of wear of the bearing is determined based on the position of each resistor piece where the coloring material attached to each resistor piece develops a color. Indicator.