JPH06741Y2 - Pressure detector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a lowered pressure detection device having a relatively low pressure.
This device is mainly applied to the safety device for bearing oil pressure drop and thrust bearing abnormality such as steam turbine, gas turbine, turbine, blower and compressor.

[Conventional technology]

The conventional technique is shown in FIGS. Lower casing 1
The screw hole A of is connected in parallel with the bearing lubricating oil supply system,
The diaphragm 3 is pushed up by the pressure oil acting on the lower disk 2 and the diaphragm 3 as shown in the figure.

The diaphragm 3 is sandwiched between the lower disc 2 and the upper disc 4 and is crimped by a nut 5. A rod 6 is connected to the upper disc 4 by a screw B, and the rod 6 moves vertically due to hydraulic pressure.

The movement of the rod 6 is interlocked with the ON / OFF operation of a switch (not shown) or an electromagnetic valve in the electric safety device, or with a hydraulic servo mechanism in the hydraulic safety device.
It becomes a signal of the operation of the security device.

The upper casing 7 is joined to the lower casing 1 by a bolt 8 with the diaphragm 3 interposed therebetween. A screw C is cut on the upper casing 7, and the upper housing 9 is moved in the vertical direction by turning it using the hole D. By changing the set compression amount of the spring 10, the working hydraulic pressure of the safety device is changed. To change.

[Problems to be solved by the invention]

In the above-mentioned conventional device, the diaphragm 3 is sandwiched between the lower disc 2 and the upper disc 4 and is crimped by the nut 5, so that the movement followability of the rod 6 with respect to the movement amount of the diaphragm 3 is good, and the hydraulic pressure is high. Although it has the advantage of extremely good detection accuracy, it has the following drawbacks. Since the diaphragm 3 needs proper elasticity and strength oil resistance,
As shown in FIG. 5, a rubber or rubber product 12 bonded to both surfaces of a fiber or synthetic fiber 11 is generally used.

Therefore, the top and back clearances of the nut 5 and the lower disk 2
Lubricating oil penetrates into the chamber E through the contact surfaces with and comes into contact with the fibers of the diaphragm 3 or the synthetic fiber portion 11 and exudes to the outside due to the capillary phenomenon.

In many cases, electrical instrumentation parts and wiring terminals not shown are provided at locations where the lubricating oil has exuded, and when the amount of exuded oil is large, it is possible that these parts may malfunction or cause a fire.

[Means for solving problems]

The present invention has been proposed to solve such a problem, and a diaphragm that divides the interior of the casing into a pressure receiving chamber that communicates with the pressure sensing portion and a guide supporting chamber and a shaft center portion of the diaphragm are penetrated. A rod having a member protruding from the pressure receiving chamber side to the guide supporting chamber side, one end of which is connected to the device to be detected, and the other end having a member for grasping the diaphragm from the pressure receiving chamber side; A pressure detector comprising means for inserting the diaphragm from the support chamber side to grasp the diaphragm from the guide supporting chamber side, and means for inserting the diaphragm to the guide supporting chamber side and pressing the diaphragm to the pressure receiving chamber side. In the above, the means for integrally forming the grasping member for grasping the diaphragm from the pressure receiving chamber side on the end portion of the rod, and grasping the diaphragm from the guide supporting chamber side, The guide supporting chamber side is configured by a nut which is threaded on the rod part and which is mounted on the screw part, and a gripping member which is mounted between the nut and the diaphragm and crimps the diaphragm to the gripping member by the nut. It is characterized by

[Operation] In the present invention, the threaded portion is not provided on the pressure receiving chamber side of the diaphragm. Therefore, in the conventional device, the nut on the portion is removed, and thus the grasping member formed integrally with the rod for grasping the diaphragm from the pressure receiving chamber side. And the grasping member grasping from the guide supporting chamber side, the diaphragm is crimped between the two grasping members by the nut mounted on the guide supporting chamber side and not contacting the lubricating oil. Therefore, it is possible to completely prevent the lubricating oil from leaking to the guide support chamber side.

〔Example〕

An embodiment according to the present invention will be described with reference to FIGS. In each figure, the same parts are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the diaphragm 3 and the upper disc 14 are inserted into the rod with disc 13, and the threaded portion F provided on the rod with disc 13 is provided.
Is tightened with nut 15. At this time, the diaphragm 3 is crimped and fixed by the disc portion G of the disc mounting rod 13 and the upper disc 14.

The reason that the disk portion G contacts the diaphragm 3 is only the circumferential portion H and the clearance S is provided in the middle portion is to increase the surface pressure of the contact portion, which is not different from the conventional technique. There is no difference from the conventional technology other than the technology of the present invention.

By this method, the pressure receiving chamber J below the diaphragm has no threaded portion, and the fibers of the diaphragm 3 or the synthetic fibers do not come into contact with the lubricating oil. Therefore, leakage of lubricating oil to the outside can be completely prevented.

Next, when an abnormality occurs in the thrust bearing and the main shaft moves in the axial direction, the hydraulic pressure increases in accordance with the amount of movement and the technology to detect the abnormality in the thrust bearing is widely known and applied to various rotary machines. .

In this case, too, a diaphragm type low oil pressure detector is used.
Although the leakage of lubricating oil from the diaphragm is a problem, the present invention can be used for this purpose as it is, and the leakage of lubricating oil to the outside can be completely prevented.

[Effect of device]

 The present invention has the following effects.

(1) Complete prevention of lubricating oil leakage from the bearing pressure drop and thrust bearing abnormality detection device.

(2) Prevent malfunction of electrical instrumentation due to lubricating oil leakage and improve plant reliability.

(3) Prevention of fire due to leakage of lubricating oil.

[Brief description of drawings]

1 to 2 are views showing an embodiment according to the present invention. FIG. 1 is a vertical sectional view taken along the line II of FIG. 2, and FIG. 2 shows the configuration of FIG. It is an assembly plan view. 3 and 4 are diagrams showing the structure of the conventional one, and FIG. 3 is the III of FIG.
Fig. 4 is a vertical sectional view taken along the line III-III, and Fig. 4 is an assembly plan view. FIG. 5 is an explanatory view showing the structure of the diaphragm. DESCRIPTION OF SYMBOLS 1 ... Lower casing, 3 ... Diaphragm, 7 ... Upper casing, 10 ... Spring, 12 ... Lower disc, 13 ... Rod with disc,
14 ... Upper disc, 15 ... Nut, F ... Screw part of disc rod, G ... Disc portion of disc rod.

Claims (1)

[Scope of utility model registration request] 1. A diaphragm which divides a casing into a pressure receiving chamber communicating with a pressure sensing portion and a guide supporting chamber and a shaft center portion of the diaphragm, and projects from the pressure receiving chamber side to the guide supporting chamber side. One end of which is connected to the device to be detected and the other end of which is provided with a member for grasping the diaphragm from the pressure receiving chamber side, and the rod which is inserted into the rod from the guide supporting chamber side and the diaphragm is attached to the guide supporting chamber. In the pressure detecting device comprising means for grasping the diaphragm from the pressure receiving chamber side and means for pushing the diaphragm toward the pressure receiving chamber side, which is inserted into the guide supporting chamber side and grasps the diaphragm from the pressure receiving chamber side. A member is integrally formed on the end portion of the rod, and the means for grasping the diaphragm from the guide support chamber side is screwed to the rod portion on the guide support chamber side. The pressure sensing device, characterized in that the diaphragm is constituted by a grasping member for crimping to the grasping member by the nut is mounted between the loaded nut and the nut and the diaphragm.