JP3426971B2 - Oil level gauge for gas turbine main oil tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil level gauge for a main oil tank of a gas turbine, which has a simple structure that can be installed in a bad environment with vibrations and impacts, and is suitable for magnetism generated by auxiliary materials. The oil level can be monitored automatically and accurately without being affected.

[0002]

2. Description of the Related Art FIG. 8 is a configuration diagram showing a liquid level gauge installed in a main oil tank of a gas turbine. In the figure, the foundation 6
1, a column base 50 is erected, and a main oil tank 51 is mounted on it. Lubricating oil is stored in the main oil tank 51, and 60 indicates the oil level. On the upper surface of the main oil tank 51, there is provided a base plate 52 on which auxiliary equipment for a starter device which also serves as a tank lid is installed. Reference numeral 53 is an auxiliary oil pump, and 54 is a starting motor, which is installed on the base plate 52.

Reference numeral 62 is an oil level gauge. A hollow main body 55 is inserted into the main oil tank 51, a shaft 56 is inserted through the main body 55, and a float 57 is attached to the lower portion of the shaft 56. Floating in oil, shaft 5
A pointer 57 is attached to the upper end of 6. Reference numeral 58 is a scale plate, and the state of the oil surface can be visually confirmed by the position of the pointer 57. The float 57 is the main oil tank 51
The oil surface 60 inside moves up and down, and the pointer 57 at the tip of the shaft 56 also moves up and down according to the movement. Conventionally, the height of the oil surface 60 is visually checked by the position of the pointer 57.

In the above structure, the column base 50 is usually about 10 m in height, the main oil tank 51 is mounted on it, and the auxiliary equipment is installed on the base plate 52 on the main oil tank 51. Therefore, the oil level gauge 62 is installed in a place where there is a lot of vibration, and the oil level gauge 62 itself is elongated and has a structure that is easy to shake. Therefore, the oil level gauge 62 of the gas turbine main oil tank 51 must withstand a complicated vibration and have a strong structure.
In terms of cost and maintenance, it is desired that the structure be lightweight and have a structure as simple as possible. Further, since the oil level gauge 62 is placed in an environment with a lot of vibration as described above, the pointer 5
1 vibrates, the scale of the scale plate 58 is hard to read visually, and in recent years, in order to minimize the entry of workers in a bad environment, a resort switch is attached to the main body 55 to move the shaft 56 up and down. A liquid level gauge having a function of automatically detecting the oil level 60 according to the position of the shaft 56, which is detected by a reed switch, is also realized.

[0005]

As described above, the oil level gauge of the main oil tank of the gas turbine has many mechanical vibrations, and there are many electric parts such as a starting motor and a pump in the surroundings. Is equipped with. Further, the oil level gauge itself has a long and slender structure that is easily affected by impact, and must be a strong structure that is not affected by vibration. In recent years, a reed switch has been installed in the vertical direction of the main unit to automatically detect the vertical movement of the shaft and to automatically read the oil level position. The switch is easily affected by the magnetic field generated by the surrounding auxiliary materials, and many detection malfunctions occur, causing troubles.

Therefore, the present invention provides an oil level gauge for detecting the oil level of a main oil tank of a gas turbine, which is simple and has a strong structure that withstands vibration, and the position of the oil level can be visually confirmed as in the conventional case. In addition to the conventional structure, it is possible to automatically read the oil level by using a micro switch that is resistant to adverse environments, instead of using a reed switch that is affected by the magnetic field generated by surrounding auxiliary materials. Was made as an issue.

[0007]

The present invention provides the following means (1) to (3) in order to solve the above-mentioned problems.

(1) A guide pipe inserted almost vertically into the oil of the main oil tank of the gas turbine and fixed to the upper surface of the main oil tank,
A hollow main body that communicates with the guide pipe and stands upright above the main oil tank, a hollow member with a scale plate that communicates with the main body and extends upward, and has a predetermined buoyancy so that it can move up and down in the oil inside the guide pipe. , A shaft arranged so that the lower end is connected to the upper surface of the float and inserted through the guide tube, and the tip is vertically movable in the main body and hollow member, and a pointer attached to the tip of the shaft. An oil level gauge for a gas turbine main oil tank having: a shaft having a lower part and an upper part, the upper part having a smaller diameter than the lower part, and a taper part formed in the middle thereof; And an oil level gauge for a gas turbine main oil tank, wherein the micro switch is arranged at a position where it can be operated when it contacts the tapered portion.

(2) In the invention of (1) above, the oil level gauge for a gas turbine main oil tank is characterized in that the upper part and the lower part of the shaft are connected to each other with a joint pipe closely contacted inside.

(3) An oil level gauge for a gas turbine main oil tank according to the invention of (1), wherein a plurality of guide ribs are provided in the vertical direction around the float.

In the oil level gauge of (1) of the present invention, the shaft has a taper portion formed in the middle because the upper portion has a small diameter portion and the lower portion has a large diameter portion. On the other hand, a plurality of micro switches are arranged vertically on the inner wall of the main body. When the oil level in the main oil tank changes, the change causes vertical movement of the float, and this vertical movement is transmitted to the pointer at the tip of the shaft, and the pointer moves up and down. Can be visually confirmed.
Further, the vertical movement of the oil surface causes the vertical movement of the taper portion of the shaft, and when the taper portion comes into contact with the roller of the microswitch, the microswitch is activated and a signal of that position is issued. The level of the oil surface can be displayed on a display device or the like by inputting it to the control panel of the central operation room, according to the signal from each micro switch. This microswitch is, for example, a low level position,
If installed at the middle level position or the high level position that is the upper limit, the oil level can be detected at the required position.

As described above, the micro switch is used in (1) of the present invention. Since the micro switch operates the contacts by a mechanical roller, lever, etc., it is accurately affected by the magnetism generated from the motor or the like. Operate. In particular, many auxiliary machines including motors and pumps are installed around the main oil tank of the gas turbine, and many magnetic nozzles are generated from these auxiliary machines. When used, it was affected by these nozzles, causing a malfunction. Since the micro switch is used in (1) of the present invention, no malfunction occurs.

In (2) of the present invention, the shaft is divided into two parts, an upper part and a lower part, and a joint pipe is inserted into both ends of both shafts, and both shafts are connected by a bolt or the like through the joint pipe. The shaft can be easily manufactured, and the joint portion is reinforced by the joint pipe, so that the strength of the shaft is increased, the rigidity is increased, and the vibration resistance is also improved.

In (3) of the present invention, since the guide ribs are provided around the float, the float can smoothly move up and down the inner wall of the guide pipe and is connected to the float when the vibration in the guide pipe is large. It also has the effect of suppressing the vibration of the shaft.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an oil level gauge for a gas turbine main oil tank according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a central operation room of a gas turbine, which is equipped with a control panel 2 and a display device 3. Reference numeral 5 denotes the entire liquid level gauge, which is configured as follows.

Reference numeral 10 is a shaft cover, on the surface of which a scale plate 11 is attached. 12 is the main body, 13 is the main body 1
2 is a lower flange portion, 14 is a guide tube, and a base plate 52
Is inserted into the main oil tank 51 and is fixed to the base plate 52. Reference numeral 17 denotes a bush, which supports the lower shaft 21 at the center of the flange 13 so as to be vertically movable.

Reference numeral 20 denotes a float, which floats in oil so that it can move up and down in the guide tube 14 as will be described later.
It is attached to the lower shaft 21. Reference numeral 22 denotes an upper shaft, which is connected to the lower shaft 21 and has a diameter smaller than that of the lower shaft 21. Reference numeral 23 is a pointer, which is attached to the tip of the upper shaft 22.

As described above, the float 20, the lower shaft 21, the upper shaft 22 and the pointer 23 are integrally connected, and when the float 20 moves up and down as the oil level 60 moves up and down, the movement is confirmed by the pointer 23. It is possible,
The oil surface 60 can be visually read by the scale plate 11.

24, 25 and 26 are microswitches, 24 is a lower level of the oil level 60, 25 is a middle level,
Numeral 26 is for detecting a high level respectively, and is composed of a lever type limit switch as will be described later, and is not affected by the magnetic field generated by the peripheral auxiliary motors, etc. Vibration, temperature,
It is also resistant to dirt such as oil and is used in place of conventional reed switches. Reference numeral 27 is a terminal box, to which wires from the microswitches 24 to 26 are connected, from which a detection signal is sent to the central operation room 1.

FIG. 2 is a sectional view taken along line AA in FIG.
The shaft cover 10 has an internal space 10a,
The opening 10b is formed in a cross beam shape by welding and has a structure resistant to vibration. Scale plate 15
Is attached to the front surface thereof and is made of a transparent material such as an acrylic plate and moves up and down in the space 10a from the opening 10b.
Can be seen on the scale.

FIG. 3 is a sectional view taken along line BB in FIG.
The shaft cover 10 is attached to the upper flange 12a of the main body 12, and the shaft flange 12a is provided in the upper flange 12a.
b is opened and the upper shaft 22 is inserted to allow vertical movement. A support plate 16 is attached to the back surface of the main body 12 to reinforce the main body 12. In this way, the shaft cover 10 and the main body 12 are firmly formed in a square shape,
In addition, the back surface of the main body 12 is reinforced by a support plate 16 so as to withstand vibration.

FIG. 4 is a sectional view taken along line CC of FIG.
The main body 12 is fixed to a circular flange portion 13, the periphery of the flange portion 13 is fixed on the base plate 52 with bolts 18, the bush 17 is inserted in the central portion, and the lower shaft 21 is vertically movable. The guide is inserted so that a predetermined gap is maintained.

FIG. 5 is a sectional view taken along line DD in FIG.
In the case where (a) is only the cylindrical float 20, (b) shows a modified example in which the guide rib is provided on the float.
As shown in (a), the float 20 has a circular guide tube 14
It can move up and down with a change in the oil level while keeping a predetermined clearance inside, is fixed to the lower end of the lower shaft 21, and moves up and down integrally with the upper and lower shafts 21 and 22. (B)
In order to prevent the float 20 from vibrating in the gap around the guide tube 14, a plurality of guide ribs 20a are provided so as to project from the peripheral surface at a right angle, which is effective when the float 20 vibrates violently. is there.

FIG. 6 is a detailed view of the lower shaft 21, the upper shaft 22, and the pointer 23 shown in FIG. 1, with (a) being a front view and (b) being a side view thereof. In both figures, the lower shaft 21 and the upper shaft 22 have different diameters, the lower shaft 21 has a larger diameter, and a tapered portion 21a is formed in the connecting portion. In addition, both shafts 21,2
2 are connected by an intermediate joint 30 that closely adheres to the insides of both shafts. The lower portion of the intermediate joint 30 is fixed to the lower shaft 21 with a bolt nut 34, and the upper portion of the intermediate joint 30 is fixed to the upper shaft 22 with a bolt nut 33. , Both shafts are connected.

A pointer 23 is attached to the tip of the upper shaft 22. The pointer 23 has a circular seat 31a from both sides,
31b is processed, and the pointer 23 is
Upper shaft 2 by bolt nut 32 between a and 31b
It is attached to 2. Such an intermediate joint 30 is inserted into both shafts 21 and 22 so as to be in close contact with each other.
By connecting the bolts 1 and 22 with the bolts and nuts 33 and 34, the rigidity of the shaft is increased, and a shaft resistant to vibration can be configured.

FIGS. 7A and 7B are views showing the mounting state of the microswitch, where FIG. 7A is a top view and FIG. 7B is a side view, and show the microswitch 26 in the upper position in FIG. 1 as a representative. In both figures, the micro switch 26 has a lever 26a and the roller 2 attached to the tip of the lever 26a.
6b, which is attached to the bracket 35 with a screw 37,
The bracket 35 is attached to the side surface of the main body 12 with a mounting bolt 36.

The roller 26b of the micro switch 26 is
When the float 20 rises along with the oil level and passes through the tapered portion 21a of the lower shaft 21 and the shaft 21 rises,
The lever 26a comes into contact with the surface of the lower shaft 21 and is pushed.
By tilting, the internal contacts are opened and closed. As a result, its position is detected, and the signal is sent to the central operation room 1 through the terminal box 27.

The operation of the oil level gauge having the above structure will be described with reference to FIG. When the oil in the main oil tank 51 decreases or increases, the float 20 moves up and down accordingly, and the lower shaft 21, the upper shaft 22, and the pointer 23.
Move up and down integrally. This movement is visually confirmed by the movement of the pointer 23 through the scale plate 10, and the oil level 60 can be known by reading the scale.

Further, the vertical movement is such that the taper portion 21a where the lower shaft and the upper shaft 22 are joined comes into contact with the roller 26b of the microswitch at the mounting portion of the microswitch 24, 25, 26 and passes through it. Can be detected by. Micro switch 24,
The positions of 25 and 26 correspond to the positions of 24 when the oil level is at the lower part, 25 is the middle position, that is, an appropriate position, and 26 is the upper limit position when the taper part 21a is positioned. It is set.

The signals detected by the micro switches 24-26 are sent from the terminal box 27 to the central operation room 1
Is sent to the control panel 2 inside and is displayed on the display device 3 according to each position, and the control panel 2 drives the oil supply pump drive device 6 based on these signals, and the oil level is too low. Sometimes, oil is supplied to the main oil tank 51, and when the oil reaches the upper limit level, it is controlled to stop it.

In the oil level gauge according to the present embodiment described above, the shaft cover 10 and the main body 12 that are erected on the upper portion of the base plate 52 of the main oil tank 51 have a rectangular structure capable of withstanding vibration.
Further, a shaft that is inserted into the shaft cover 10 and the main body 12 and moves up and down is used as a lower shaft 21 and an upper shaft 22 having a diameter smaller than that of the lower shaft 21.
A strong and simple structure is formed by connecting with 4. Furthermore,
Since the mechanical reed switch is used instead of the conventional reed switch as the switch for detecting the position, the oil level gauge of the structure that can withstand the adverse environment that receives the rotational vibration is realized. The microswitch for detection can realize a highly reliable oil level gauge for a gas turbine main oil tank without being affected by magnetism generated by surrounding auxiliary materials.

[0032]

The oil level gauge for a gas turbine main oil tank of the present invention (1) is a guide pipe fixed to the upper surface of the main oil tank by being inserted almost vertically into the oil of the gas turbine main oil tank. A hollow main body standing upright above the main oil tank, a hollow member with a scale plate communicating with the main body and extending upward, and provided with a predetermined buoyancy so as to be vertically movable in the oil in the guide pipe A float, a lower end of the float is connected to the upper surface of the float, the shaft is inserted through the guide tube, and the tip is vertically movable in the main body and the hollow member, and a pointer attached to the tip of the shaft. In an oil level gauge for a gas turbine main oil tank; the shaft is composed of a lower part and an upper part, and the upper part has a smaller diameter than the lower part and a taper part is formed in the middle, and a plurality of micro switches are arranged vertically on the inner wall of the main body. The same Black switch is characterized by being disposed in operable position and in contact with the tapered portion. Since such an oil level gauge uses a micro switch, unlike the conventional reed switch, it is not affected by magnetism or the like generated from surrounding auxiliary machines, and no malfunction occurs.
The oil level can be detected accurately.

The pedestal foundation on which the main oil tank is installed is constantly swaying, the starting motor resonates with the rotation component of the main engine, and the auxiliary oil pump of the auxiliary oil pump is mounted on the base plate on which the oil level gauge is mounted. In addition, rotating machines with different vibration characteristics such as auxiliary gears, torque converters, main oil pumps, vapor fans, etc. are arranged, and the combined vibrations of these are constantly transmitted to the base plate. With respect to these synthetic vibrations, vibration is reduced, and the structure is strong and has few failures.

(2) of the present invention is characterized in that, in the above-mentioned invention (1), the upper part and the lower part of the shaft are connected to each other with a joint pipe closely contacting the inside thereof. With such a configuration, the upper shaft and the lower shaft are reinforced by the joint pipe, so that the shaft can be easily manufactured, and the rigidity is increased to improve the vibration resistance.

The invention (3) is characterized in that, in the invention (1), a plurality of guide ribs are provided in the vertical direction around the float. With such a configuration, the vibration of the float in the guide pipe is suppressed, the float can smoothly move up and down the inner wall of the guide pipe, and the vibration of the shaft connected to the float is also suppressed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an oil level gauge for a gas turbine main oil tank according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a sectional view taken along line CC in FIG.

5A and 5B are cross-sectional views taken along the line D-D in FIG. 1, in which FIG. 5A shows a circular float only, and FIG. 5B shows a modified example in which a guide rib is attached to the float.

FIG. 6 shows a shaft of an oil level gauge for a gas turbine main oil tank according to an embodiment of the present invention, (a) is a front view,
(B) is the side view.

FIG. 7 shows the mounting state of the micro switch of the oil level gauge for the gas turbine main oil tank according to the embodiment of the present invention,
(A) is a top view and (b) is a side view.

FIG. 8 is a configuration diagram showing an attachment state of an oil level gauge of a conventional gas turbine main oil tank.

[Explanation of symbols]

1 Central operation room 2 control room 3 display devices 5 Oil level gauge 10 Shaft cover 11 scale plate 12 body 13 Flange 14 Guide tube 17 Bush 20 floats 21 Lower shaft 21a taper part 22 Upper shaft 23 guidelines 24, 25, 26 micro switch 27 Terminal Box 51 Main oil tank 52 Base plate 60 oil level

Front page continuation (72) Inventor Noriichi Miyamoto 2-1-1 Shinhama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Koji Fujita 1-chome, Fukushima-ku, Fukushima-ku, Osaka Inside the Nippon Denka Kogyosho Co., Ltd. (72) Inventor Kei Soda City, 10-5 Kojidai, Nishi-ku, Kobe City Inside the company (56) References JP-A-9-288000 (JP, A) JP-A-56-64619 ( JP, A) Actual Kaihei 5-19922 (JP, U) Actual Kaihei 4-55521 (JP, U) Actual Kohei 3-28347 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01F 23/60 F02C 7/00 F01M 11/12

Claims (3)

(57) [Claims] 1. A guide pipe inserted substantially vertically into the oil of a gas turbine main oil tank and fixed to the upper surface of the main oil tank, and a hollow main body which communicates with the guide pipe and stands upright above the main oil tank, A hollow member with a scale plate that communicates with the main body and extends upward,
A float that is arranged in the oil in the guide pipe so that it can move up and down with a predetermined buoyancy, and the lower end is connected to the upper surface of the float and inserted through the guide pipe, and the tip moves up and down in the main body and hollow member. In a level gauge for a gas turbine main oil tank having a movably arranged shaft and a pointer attached to the tip of the shaft; the shaft has a lower part and an upper part, and the upper part has a smaller diameter than the lower part and tapers in the middle. And a plurality of microswitches are arranged in the vertical direction on the inner wall of the main body, and the microswitches are arranged at positions operable when contacting the tapered portion. Oil level gauge for oil tanks. 2. The oil level gauge for a gas turbine main oil tank according to claim 1, wherein the shaft has the upper portion and the lower portion connected to each other with a joint pipe closely attached to the inside. 3. The oil level gauge for a gas turbine main oil tank according to claim 1, wherein a plurality of guide ribs are provided in the vertical direction around the float.