JP2001027390A - Orifice type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drain a large amount of low temperature condensed water and decrease the leak of steam. SOLUTION: In a valve chamber 3, a plurality of orifices 5, 6 are arranged by eccentrically placing the respective center axes of the orifices 5, 6. Disk- shaped bimetals 14, 7 are mounted in a front step part of the orifices 5, 6. A plurality of through holes 14, 15, 16, 17 are provided in the disk-shaped bimetals 14, 7. The disk-shaped bimetal 14, 7 are deformed into circular arc shape as shown in the drawing at low temperature time to discharge a large amount of low temperature condensed water and deformed into flat plate shape, when a prescribed high temperature is generated, to reduce a passing area of the orifices 5, 6. Steam passing the orifice 5, by colliding against the disk- shaped bimetal 7 and a plate-shaped part of an orifice member 11 in the following step, is prevented from passing through the through hole 17 and the orifice 6, and a leak of the steam can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensed water of steam generated in a steam piping system of a steam transport pipe, a steam-using device, or the like to the outside, and more particularly, to a steam trap which constantly operates. The present invention relates to an orifice type steam trap for discharging condensate from a plurality of orifices that are open.

[0002]

2. Description of the Related Art As a conventional orifice type steam trap, for example, the one disclosed in Japanese Utility Model Laid-Open Publication No. 60-2098 has been used. This is a plurality of plate-like bodies 2 provided with orifices 4 arranged in series in a valve chamber. After the condensate passes through the orifices 4, the condensate re-evaporates in the gaps 6 to increase the volume. The resistance of the passage of the steam serves to minimize leakage of the live steam to the outside.

[0003]

In the above-mentioned conventional orifice type steam trap, there is a limit in reducing leakage of live steam to the outside, and there is a problem that steam leakage cannot be reliably prevented. This is due to the fact that when multiple orifices are arranged in series, the orifices are arranged on the same axis by aligning the central axes of the orifices. In the case of, a so-called steam penetration phenomenon occurs in which most of the steam that has passed through the preceding orifice also passes through the subsequent orifice, and the steam passes through a plurality of orifices and causes steam leakage. It is.

Further, in the above-mentioned conventional apparatus, when the amount of condensed water generated increases, there is a problem that the condensed water is not completely discharged and stays there. This is because the area of the orifice that is always open is constant, and condensate cannot be completely discharged, especially when a large amount of low-temperature condensate occurs, such as during the initial startup of equipment that uses steam. They will stay.

Accordingly, an object of the present invention is to provide an orifice type steam trap capable of reliably discharging a large amount of low-temperature condensate and preventing steam from leaking to the outside. .

[0006]

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problem by forming an inlet, a valve chamber, and an outlet in a trap casing in order, and connecting a plurality of small-diameter orifices in series in the valve chamber. The condensate discharge hole is formed by the small-diameter orifice, and the condensate in which steam is condensed is discharged from the condensate discharge hole to the outside of the system. At the same time, a plate-shaped or band-shaped temperature responsive element is arranged to face each orifice, a plurality of through holes are provided in the temperature responsive element, and a through hole at a position facing the inner orifice of the through hole is inserted into the orifice. And the total cross-sectional area of the plurality of through-holes is made larger than the passing area of the orifice, and the temperature-responsive element deforms at a predetermined low temperature to open the plurality of through-holes. It becomes a high temperature and deformation temperature responsive element is intended for closing except a through hole at a position opposed to the orifice.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION By arranging a plurality of orifices eccentrically, steam passing through a preceding orifice collides with a plate-like portion other than a hole of a subsequent orifice, thereby causing a penetration phenomenon. By converting the velocity energy into pressure energy, the pressure at the rear of the front orifice rises, preventing the flow of steam from the front orifice, and reducing the leakage of steam to the outside. can do.

A temperature responsive element having a through-hole having a total cross-sectional area larger than the passage area of the orifice is disposed opposite to each orifice, and at a predetermined low temperature, the temperature responsive element is deformed to close the through-hole. By opening the orifice, the orifice can be fully opened at a low temperature to discharge a large amount of condensate.

On the other hand, when the temperature of the passing fluid becomes a predetermined high temperature, the temperature responsive element is deformed and closed except for a through hole smaller than the orifice passage area at a position facing the orifice, thereby closing the orifice. The passing area is narrowed, and the amount of high-temperature steam passing can be reduced as much as possible.

[0010]

In FIG. 1, an inlet 2, a valve chamber 3 and an outlet 4 are sequentially formed in a cylindrical trap casing 1, and a plurality of orifices 5, 6 and temperature-responsive elements 7, 12 are arranged in the valve chamber 3. To form an orifice type steam trap.

The inlet 2 is connected to a steam-using device or a steam transport pipe (not shown), and condensate generated at these steam-using locations is discharged to the outside through the orifices 5, 6 and the outlet 4. . Between the inlet 2 and the valve chamber 3, a basket-shaped screen 8 for filtering foreign substances such as dust mixed in the passing fluid is attached to the casing 1 by a retaining ring 9.

In the valve chamber 3 communicating the inlet 2 and the outlet 4, cylindrical orifice members 10, 11 each having an inverted U-shaped cross section provided with orifices 5, 6 are fixed to the casing 1 by a retaining ring 13. I do. Orifice member 10, 1
1 have substantially the same shape, but the orifices 5
The orifices 6 are attached so that the positions thereof are eccentric, that is, the center axes of the orifices 5 and 6 do not coincide. In this embodiment, the orifice 5 is mounted below the valve chamber 3 while the orifice 6 is mounted above the valve chamber 3.

At the position facing the inlet 2 side of the orifice 5, the lower end of the orifice member 10 and a part of the casing 1 sandwich the lower end of the temperature responsive element 12 and are attached.
Parts other than the lower end are arranged so as to be deformable. Temperature responsive element 12
Can be made of a disk-shaped or band-shaped bimetal, a shape memory alloy, or the like. The temperature responsive element 12 is provided with a plurality of through holes 14 and 15. The through-hole 14 has a cross-sectional area larger than the passage area of the orifice 5, and the through-hole 15 has a cross-sectional area smaller than the passage area of the orifice 5 at a position facing the orifice 5.

The disc-shaped bimetal 12 as a temperature-responsive element shown in FIG. 1 shows a state in which the inside of the casing 1 is curved in an arc at a predetermined low temperature. Predetermined high temperature inside, usually 8
At a high temperature of about 0 ° C. to about 100 ° C., the disc-shaped bimetal 12 is deformed toward the orifice 5 and becomes a flat plate, and the through-hole 14 is tightly closed to the orifice member 10 and closed.
On the other hand, the through hole 15 is located above the orifice 5 to maintain the through state.

A disk-shaped bimetal 7 as a temperature responsive element is similarly fixed and attached to a position facing the orifice 6 at the subsequent stage. A plurality of through holes 1 are also formed in the disc-shaped bimetal 7.
6 and 17, the through-hole 16 has a cross-sectional area larger than the passage area of the orifice 6, while the through-hole 17 has a cross-sectional area smaller than the passage area of the orifice 6 at a position facing the orifice 6.

The state shown in FIG. 1 of the disk-shaped bimetal 7 also shows a state in which the inside is deformed into an arc shape at a low temperature and the through holes 16 and 17 are both opened. When the inside becomes a predetermined high temperature similarly to the bimetal 12 in the previous stage, the disc-shaped bimetal 7 is deformed into a flat plate shape, closes the through hole 16, and the through hole 17 maintains the through state via the orifice 6. is there.

When condensate flows into the valve chamber 3 from the inlet 2, the ascites that has been filtered off by the screen 8 is
It flows down to the through holes 14 and 15, the orifice 5, the through holes 16 and 17 and the orifice 6, and is discharged from the outlet 4 to the outside.

The temperature of the fluid flowing into the valve chamber 3 is 10
At a relatively low temperature of about 0 ° C. or less, the disk-shaped bimetals 14 and 7 are deformed in an arc shape as shown in FIG. 1, and the plurality of through holes 14, 15, 16 and 17 and the respective orifices 5 are formed. , 6 can discharge a large amount of condensate.

When the low-temperature condensate is discharged and the temperature of the condensate flowing into the valve chamber 3 rises to about 100 ° C., the disc-shaped bimetals 14 and 7 are each deformed into a flat plate shape, and the orifice 15 having a small sectional area is formed. , 17 are in a penetrating state to reduce leakage of steam to the outside.

Next, when the condensate is discharged and the steam flows down from the inlet 2 into the valve chamber 3, the steam passes through the through-hole 15 and the orifice 5 in the former stage as in the prior art. The steam that has passed through the orifice 5 collides with the disk-shaped bimetal 7 at the subsequent stage and the flat portion of the orifice member 11, so that the steam does not pass straight through the through-hole 17 and the orifice 6 at the subsequent stage. Floating in the space surrounded by 11. In this case, the velocity energy of the steam that has passed through the orifice 5 is converted into pressure energy in the space surrounded by the orifice members 10 and 11, and the pressure in the space increases, so that the vapor energy from the orifice 5 in the space is increased. Reduce the flow down to

By arranging the orifices 5 and 6 eccentrically in this manner, it is possible to prevent more vapor from being discharged from the outlet 4 to the outside.

[0022]

As described above, according to the present invention, by changing the passage area of the orifice by the temperature responsive element according to the fluid temperature, and by arranging a plurality of orifices eccentrically, a large amount of The low-temperature condensate can be reliably discharged, and the leakage of steam to the outside can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an orifice type steam trap according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trap casing 2 Inlet 3 Valve room 4 Outlet 5, 6 Orifice 7 Disc-shaped bimetal 8 Screen 10, 11 Orifice member 12 Disc-shaped bimetal 14, 15, 16, 17 Through-hole

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are sequentially formed in a trap casing, a plurality of small-diameter orifices are arranged in series in the valve chamber, and a condensate discharge hole is formed by the small-diameter orifice. In the device that discharges condensate in which steam is condensed from the discharge hole to the outside of the system, the central axes of the plurality of orifices are eccentric before and after the series, and a plate-shaped or band-shaped temperature-responsive element is arranged facing each orifice. Then, a plurality of through holes are provided in the temperature responsive element, the through hole at a position facing the inner orifice of the through hole is made smaller than the passage area of the orifice, and the total cross-sectional area of the plurality of through holes is set to the orifice. When the temperature response element is deformed at a predetermined low temperature to open the plurality of through holes, the temperature response element is deformed at a predetermined high temperature to face the orifice. An orifice type steam trap which is closed except for a through hole in a position.