JPH0517514U - Operation indicator for drain discharge device - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to check the operating status of the drain discharge device safely and quickly. [Structure] A gauge 6 is incorporated in an outer cylinder 1 having a display window 1a, and the gauge 6 is pulled by a coil spring 2 and a coil spring 7 made of a shape memory alloy, and the shape memory alloy is in a state where a steam trap is normally operating. The coil spring 2 makes a transition due to high temperature to overcome the coil spring 7 to hide the gauge 6 from the display window 1a, and when closed, the coil spring 7 wins to expose the gauge 6 from the display window 1a so that the gauge 6 can be visually recognized. [Effect] Since the normality and abnormality of the steam trap can be easily visually recognized by the operation status of the gauge 6, the operation status confirmation work of the steam trap can be performed safely and quickly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention can easily visually identify whether or not a drain discharge device such as a steam trap attached to a drain pipe in a steam pipe or a drain trap for discharging a high temperature condensate out of the system is operating normally. Regarding operation indicators that can be performed.

[0002]

[Prior Art]

 The drain line in the steam pipe may become clogged for some reason, and if the drain is not discharged, it may lead to an accident. Therefore, it is necessary to regularly check the steam trap attached to the drain line. This method operates by placing a hand on the steam trap and confirming it by radiant heat, and by placing a substance with a relatively low melting point, such as sulfur powder, on the steam trap and melting the powder with heat. The method of confirmation is known.

[0003]

[Problems to be solved by the device]

 However, in the case of the method of holding up the hand, there is a concern that the steam trap may be directly touched by the hand, and the method of using the low melting point powder takes time to confirm, and many steam traps are attached. Inspection takes too much time at factories.

An object of the present invention is to provide an operation indicator for a drain discharge device which operates reliably and can be visually and easily and safely confirmed.

[0005]

[Means for Solving the Problems]

 The operation indicator according to the present invention has the following structure.

[0006] An outer cylinder that can be attached to the drain discharge device and has a display window opened substantially at the center, and a gauge that is slidably installed in the outer cylinder to the left and right on the back side of the display window of the outer cylinder. In the outer cylinder, the outer end is fixed to the outer cylinder, the inner end is fixed to the gauge, and the coil spring made of a shape memory alloy has a characteristic of contracting when the transition temperature is exceeded and expanding at normal temperature, On the opposite side of the shape memory alloy coil spring in the cylinder, the outer end is fixed to the outer cylinder, the inner end is fixed to the gauge, and the shape memory alloy coil spring is stretched, the elasticity is superior and the display window A drain discharge device operation indicator consisting of a coil spring whose elasticity is set so that the gauge is exposed inside and hidden when it is contracted.

The cross-sectional shape of the outer cylinder may be circular, square, or the like.

[0008]

[Action]

 The operation indicator according to the present invention is closely fixed to a steam trap or the like by using a fixture. When the steam trap is operating normally, the line temperature is high, and the outer cylinder is also heated accordingly.This heat causes the shape memory alloy coil panel to transfer and the gauge to come off the display window. Have been pulled into. As a result, this gauge cannot be seen from the outside, and the normal condition can be seen.

On the other hand, when the line is in a closed state and the steam trap is not operating, the steam trap is cold and the outer cylinder temperature also cools down to normal temperature, so that the shape memory alloy coil spring is below the transition temperature. As a result, the force of the coil spring on the opposite side prevails and the gauge is pulled back to the display window. As a result, an abnormality (blockage) can be seen by visually observing this gauge from the outside.

[0010]

【Example】

 In FIG. 1, reference numeral 1 denotes a metal outer cylinder having a display window 1a opened in the center, and a gauge 6 is slidably mounted on the back side of the display window 1a of the outer cylinder 1 so as to be slidable left and right. The outer cylinder 1 is formed with a mounting surface curved along the outer peripheral surface of the steam trap in order to improve the adhesion with the steam trap.

Reference numeral 2 denotes a shape memory alloy coil spring having an outer end fixed to the outer cylinder 1 by a pin 3 and an inner end fixed to the gauge 6 by a pin 5 in the outer cylinder 1.

A coil 7 is fixed to the outer cylinder 1 with a pin 4 and an inner end is fixed to the gauge 6 with a pin 5 on the opposite side of the shape memory alloy coil spring 2 in the outer cylinder 1. It is a spring.

The operation indicator having the above-mentioned structure is closely fixed to the surface of the steam trap with a fixing tool. Therefore, the steam trap is hot when the steam trap is operating normally. Therefore, the outer cylinder 1 also becomes hot, and the shape memory alloy coil spring 2 is transferred and contracted under the influence of this heat, so that the gauge 6 is disengaged from the display window 1a of the outer cylinder 1 as shown in FIG. It is hidden in the outer cylinder 1. On the other hand, when the steam trap is cold (closed), the outer cylinder 1 returns to room temperature, and the shape memory alloy coil spring 2 also reaches room temperature, so the elasticity of the coil spring 7 side is relatively large. Therefore, as shown in FIG. 1, the gauge 6 is pulled toward the display window 1a by the coil spring 7 and is exposed from the display window 1a.

With such movement of the gauge 6, in the case of the embodiment, it can be identified as normal when the gauge 6 is hidden and invisible, and abnormal when visible.

Contrary to the embodiment, by utilizing the characteristic of the shape memory alloy coil spring 2 that it contracts at room temperature and expands at high temperature, the gauge 6 can be visually recognized under normal conditions and not when closed. It can also be configured as follows.

[0016]

As described above, according to the present invention, the gauge is operated by the transition of the coil spring made of the shape memory alloy to display the normality and the occlusion by the visually recognizable means, so the operation is reliable. Also, since it is only visually confirmed from the outside, the confirmation work can be performed efficiently and it is safe.

In addition, since the present invention does not use a power source such as electricity, it can be used in a flammable gas atmosphere.

[Brief description of drawings]

FIG. 1 is a front view of an operation indicator according to the present invention.

FIG. 2 is a sectional view taken along the line AA ′.

FIG. 3 is an explanatory view of a state (normal) in which the gauge is operating.

[Explanation of symbols]

 1 Outer cylinder 1a Display window 2 Coil spring made of shape memory alloy 6 Gauge 7 Coil spring

Claims (2)

[Scope of utility model registration request] 1. An outer cylinder that can be attached to a drain discharge device and has a display window opened substantially in the center; A gauge, in the outer cylinder, an outer end is fixed to the outer cylinder, an inner end is fixed to the gauge and contracts when the transition temperature is exceeded, and a shape memory alloy coil spring having a characteristic of expanding at normal temperature, On the opposite side of the shape memory alloy coil spring in the outer cylinder, the outer end is fixed to the outer cylinder, the inner end is fixed to the gauge, and the elasticity is superior when the shape memory alloy coil spring is extended. A drain discharge device operation indicator consisting of a coil spring whose elasticity is set so that the gauge is exposed in the display window and hidden when it is contracted. 2. A shape memory alloy coil spring is selected such that it expands when the transition temperature is exceeded and contracts at room temperature, and when the shape memory alloy coil spring is expanded and extended, the force of the coil spring wins the gauge. 2. The operation indicator for the drain discharge device according to claim 1, wherein the gauge is exposed from the display window and the gauge is hidden from the display window when contracted.