JPH0740794Y2 - Orifice trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an orifice trap which is attached to a steam-using device or a steam piping system to discharge drain generated therein.

The generation of drain is unavoidable in the steam using device and the steam piping system, and so-called steam trap has been used to automatically remove the generated drain automatically. As these steam traps, float type steam traps that detect the difference in specific gravity between steam and drain with a float and open / close the valve, and disk type steam traps that utilize the difference in thermodynamic characteristics between steam and drain have been used. However, these traps require floats, disk valves, valve mechanisms, etc., which increase the number of parts and complicate the mechanism, causing malfunctions after long-term use, causing steam leakage, or conversely draining. There was a case where the drain could not be discharged despite the occurrence of.

2. Description of the Related Art Orifice traps have been conventionally used as those having a small number of parts and a simple structure. The orifice trap has a relatively small diameter orifice horizontally or vertically attached to the end of the drain discharge pipe to continuously discharge a certain amount of drain. It is a simple structure that only an orifice member with a small diameter orifice is attached, and by appropriately selecting the orifice diameter suitable for the amount of drain generated, it is possible to make a trap with almost no vapor leakage or drain discharge failure. .

Problems to be Solved by the Invention In the above-mentioned conventional orifice trap, there is a problem that the orifice is clogged with foreign substances such as rust and scale contained in the drain because the orifice diameter is small.
If the orifice is clogged, the drain will stay and a water hammer phenomenon will occur in the steam piping system, or the heat transfer coefficient will decrease in the steam using device, resulting in a decrease in productivity. In addition, foreign matter such as rust, carbon, iron powder, etc. is likely to occur in the steam pipe or in the steam using device, and it may flow into the end of the steam pipe or the orifice trap that is often installed below the outlet side of the steam using device. It blocks the orifice.

Therefore, the technical problem of the present invention is to obtain an orifice trap which is not clogged by foreign matter in the drain.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem is to form an inlet, an orifice chamber and an outlet with a trap casing, and to provide one or a plurality of orifice chambers in the orifice chamber. In the case where the drain is discharged to the outside by providing an orifice, a temperature responsive member with one end fixed with a trap casing and a rod member having a diameter slightly smaller than the orifice diameter attached to the other end is provided at the inlet side or the outlet side of the orifice. ,
The rod member is arranged so as to face the orifice so that the rod member penetrates through the orifice due to the deformation of the temperature responsive member due to the temperature change.

Action The action of the above technical means is as follows.

When the drain temperature is raised or lowered from the initial state to cause a temperature change, the temperature responsive member is deformed, so that the rod member penetrates the orifice. By the rod member penetrating the inside of the orifice, foreign substances such as rust and scale that have adhered to and blocked the inside of the orifice are excluded from the inside of the orifice.

As the temperature responsive member, conventionally known members such as bimetal, shape memory alloy, thermowax, liquid sealed bellows can be appropriately used.

Effect of the Invention According to the present invention as described above, even if the orifice of the orifice trap is clogged with a foreign substance, the orifice can be automatically cleaned by the temperature change in the trap and the clogging can be released.

Example An example showing a specific example of the above technical means will be described (see FIGS. 1 to 3).

Cap nut 3 using inlet member 1 and outlet member 2 as fastening members
Are fastened together to form a trap casing. Entrance member 1
And female member at the end of the outlet member 2 for pipe connection respectively
4,5 provided. A disk-shaped partition wall member 7 that separates the inlet 4 and the outlet 5 is attached to a substantially cylindrical orifice chamber 6 formed in the trap casing between the female screw portions 4 and 5. The outer periphery of the partition member 7 and the inner periphery of the trap casing are airtightly finished to prevent drainage and steam from leaking to the outlet 5 side. The partition wall member 7 is provided with the convex portion 7a at substantially the center thereof and the orifice 9. A cylindrical accommodating member 10 accommodating the temperature responsive member 11 is attached by sandwiching one end between the partition member 7 and the casing. The storage member 10 has a hole 10a for allowing the drain to flow down,
Provide multiple 10b. The temperature responsive member 11 is formed of a double spiral wound bimetal. That is, a long thin bimetal plate is formed into a spiral shape as shown in FIG. 2 and further into a spiral shape as shown in FIG. Temperature responsive member 11
A rod member 12 having a diameter slightly smaller than the diameter of the orifice 9 is attached so as to face the orifice 9 on the partition member 7 side (in FIG. 1, the temperature responsive member 11 extends so that the rod member 12 opens the orifice 9). Shows the state that has penetrated).

The tip of the rod member 12 is tapered so that foreign matter can be easily removed. Reference numeral 13 is a gasket that keeps the trap casing airtight.

Next, the operation will be described.

When a low temperature drain flows in from the inlet 4, the temperature responsive member 11 extends (state shown in FIG. 1) and the rod member 12 penetrates the orifice 9. In this case, even if the orifice 9 is clogged with foreign matter such as rust or scale, it is removed by penetrating the rod member 12, part of which falls to the outlet 5 side and part of which falls from the convex portion 7a and onto the partition member 7. Collect The low temperature drain is discharged from between the rod member 12 and the orifice 9, and when the drain temperature rises, the temperature responsive member 11 contracts, and the rod member 12 is positioned below the orifice 9 and functions as a normal orifice trap. Further, even if the functioning as a normal orifice trap, even if the orifice 9 is blocked by a foreign substance, the drain does not flow down and the temperature responsive member 11
The temperature of the surroundings is gradually decreased and the temperature responsive member 11 is expanded again, and the inside of the orifice 9 is automatically cleaned.
The blockage is released and the function as an orifice trap is restored.

In this embodiment, when the temperature is low, the rod member 12 is the orifice 9
Although an example of penetrating through is shown, when a temperature responsive member 11, particularly a bimetal is used, extension and contraction can be freely designed by temperature change, and the orifice 9 can be penetrated at high temperature. In addition, in this embodiment,
Although the example in which the temperature responsive member 11 is arranged on the outlet side of the orifice 9 is shown, the temperature responsive member 11 may be arranged on the inlet side. Further, in the present embodiment, an example in which the temperature responsive member 11 uses a double spiral bimetal is shown, but the shape is not limited to the spiral shape, and may be a disk shape or a strip shape.

[Brief description of drawings]

1 is a sectional view of an embodiment of the orifice trap of the present invention, and FIG. 2 is a front view of a thin plate bimetal in a single spiral shape for explaining the manufacturing process of the temperature responsive member in FIG. FIG. 3 is a plan view in which the spiral bimetal shown in FIG. 2 is formed into a double spiral shape. 1: Inlet member, 2: Outlet member 7: Partition member, 9: Orifice 11: Temperature response member, 12: Bar member

Claims (1)

[Scope of utility model registration request] 1. A trap casing which forms an inlet, an orifice chamber and an outlet, and one or more orifices are provided in the orifice chamber to discharge the drain to the outside. One end of the trap casing is fixed and the other is fixed. A temperature responsive member with a rod member slightly smaller than the orifice diameter attached to the end is provided on the inlet side or the outlet side of the orifice, and the rod member is arranged so as to face the orifice, and the temperature responsive member is deformed by the temperature change. Therefore, the orifice member is characterized in that the rod member penetrates the inside of the orifice.