JP2001027392A - Orifice type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge a large amount of low temperature condensed water, and decrease a leak of steam. SOLUTION: In valve chambers 4, 5, orifices 6, 7 are arranged by eccentrically placing their respective center axes. Valve elements 15, 18 energizing valve ports 21, 22 in an opening direction by coil springs 16, 17 are arranged in the valve chambers 4, 5. At low temperature time, the valve elements 15, 18 are unseated from valve seat members 8, 9, the valve ports 21, 22 are fully opened so as to discharge a large amount of low pressure condensed water and closed so as to open only the orifices 6, 7 when a prescribed high pressure is generated. Steam passing the orifice 6, by colliding against an inner wall or the like of a main unit 2, eliminates direct passing through the orifice 7 in the following step, and a leak of the steam to the outside can be decreased.

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 orifice, which is always open, has a constant passing area, and condensate is condensed when a large amount of condensate is generated at low steam pressure, such as during the initial startup of equipment using steam. They stay without being discharged.

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

[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 the steam is condensed is discharged from the condensate discharge hole to the outside of the system. A valve seat section that partitions the room into an inlet side and an outlet side is provided, and a valve body is disposed so as to be displaceable in opposition to the valve seat section, and the valve body is biased in a direction away from the valve seat section. An orifice that connects the inlet side and the outlet side is provided in the valve body or the valve seat portion, and the center axis of the orifice is eccentric before and after in series.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By arranging the center axes of the orifices eccentrically before and after the series, the steam passing through the orifice at the preceding stage collides with a plate-like portion other than the hole of the orifice at the subsequent stage. By converting the velocity energy into pressure energy, the pressure at the rear of the former orifice rises, preventing the steam from flowing down from the former orifice, and preventing the steam from flowing outside. Leakage can be reduced and prevented.

[0008] A plurality of valve chambers are arranged in series, a valve seat portion for partitioning the valve chamber into an inlet side and an outlet side is provided, and a valve body is disposed so as to be displaceable in opposition to the valve seat portion. When the pressure of the fluid including the condensate is low due to the attachment of the elastic member that biases in the direction away from the valve seat, the valve member is separated from the valve seat by the elastic member and the inlet side. By communicating with the outlet side, a large amount of low-pressure condensate can be quickly discharged to the outlet side through this opened valve seat.

On the other hand, when the pressure of the passing fluid becomes a predetermined high pressure, the elastic member is displaced by the fluid pressure and the valve body is seated on the valve seat, so that the inlet side and the outlet side communicate only through the orifice. As a result, the amount of high-pressure steam that passes can be minimized.

[0010]

1 shows a cylindrical inlet member 1 and a main body 2 in FIG.
And the outlet member 3 to form a trap casing, the inlet member 1 and the main body 2 to form a valve chamber 4, and similarly, the main body 2 and the outlet member 3 to form a valve chamber 5, inside which orifices 6, 7 and valves The orifice type steam trap is constituted by arranging the seat members 8 and 9.

An inlet 10 is provided in the inlet member 1. The inlet 10 is connected to a steam-using device or a steam transport pipe (not shown), and condensate generated at these steam-using locations is passed through the valve chambers 4 and 4.
It is discharged to the outside through the outlet 5 and the outlet 11 of the outlet member 3. Between the inlet 10 and the valve chamber 4, a cylindrical screen 12 for filtering foreign substances such as dust mixed in the passing fluid is attached via a holding member 13. A plurality of through holes 14 are provided in the holding member 13 to communicate the inlet 10 and the valve chamber 4.

A substantially disk-shaped valve element 15 is provided at a position facing the valve seat member 8 in the valve chamber 4 with a coil spring 16 as an elastic member.
To place through. The coil spring 16 is a compression coil spring and urges the valve body 15 in a direction away from the valve seat member 8. The state shown in FIG. 1 shows a state in which the valve body 15 is pushed down by the fluid pressure from the inlet 10 against the elastic force of the coil spring 16 and is seated on the valve seat member 8. The valve seat member 8 is provided with an orifice 6 that constantly communicates the inlet 10 and the outlet 11, and a valve port 21 having a large cross-sectional area that is opened and closed by the valve body 15.

The valve chambers 4 and 5 communicate with each other through a through hole 20 provided in a disk-shaped partition plate 19. Similarly, the orifice 7 and the valve port 22 penetrating the valve seat member 9, the coil spring 17 and the valve element 18 are disposed in the valve chamber 5, and the valve element 18 is moved by the coil spring 17 to the valve seat member 9. It is urged to move away from In the present embodiment, the position of the orifice 6 is located below the valve chamber 4 so that the positions of the orifices 6 and 7 are eccentric, that is, the center axes of the orifices 6 and 7 do not coincide. The orifice 7 is mounted so as to be located above the valve chamber 5.

When the pressure of the fluid containing condensate flowing into the valve chambers 4 and 5 is low, the valve bodies 15 and 18 are moved by the elastic force of the coil springs 16 and 17 to the holding member 13 and the partition plate 19 side. When the valve seat members 8 and 9 are fully opened, a large amount of low-pressure condensate can be discharged from the outlet 11 to the outside.

When the low-pressure condensate is discharged and the condensate pressure flowing into the valve chambers 4 and 5 rises to a predetermined pressure, the valve bodies 15 and 18 are connected to the valve seat members 8 and 9 as shown in FIG. Sit down,
By closing the valve seat members 8 and 9, only the orifices 6 and 7 having a small cross-sectional area are in a penetrating state, and leakage of steam to the outside is reduced.

Next, when the condensate is discharged and the steam flows down from the inlet 10 into the valve chamber 4, the steam passes through the orifice 6 in the former stage as in the prior art, but passes through the orifice 6. The passed steam collides with the inner wall or the like of the main body 2 and drifts in the valve chamber 5 without directly penetrating the orifice 7 at the subsequent stage. In this case, orifice 6
Is converted into pressure energy in the valve chamber 5, and the pressure in the valve chamber 5 increases, so that the steam flowing from the orifice 6 into the valve chamber 5 is reduced.

By eccentrically arranging the orifices 6, 7, it is possible to prevent more vapor from being discharged from the outlet 11 to the outside.

[0018]

As described above, according to the present invention, when the fluid pressure is low to a predetermined value, a large amount of valve is opened by separating the valve body from the valve seat by the elastic member and opening a large valve port. The low-pressure condensate can be reliably discharged, and since the plurality of orifices are eccentrically arranged in series, leakage of steam to the outside can be more 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 Inlet member 2 Main body 3 Outlet member 4, 5 Valve room 6, 7 Orifice 8, 9 Valve seat member 10 Inlet 11 Outlet 15 Valve body 16, 17 Coil spring 18 Valve body

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 a device for discharging condensate in which steam condensed from a discharge hole to the outside of the system, a plurality of valve chambers are arranged in series, and a valve seat portion that partitions the valve chamber into an inlet side and an outlet side is provided. The valve body is disposed so as to be displaceable in opposition to the portion, and an elastic member that biases the valve body in a direction away from the valve seat portion is attached, and the inlet side and the outlet side are attached to the valve body or the valve seat portion. An orifice-type steam trap, wherein an orifice communicating with the orifice is provided, and the center axis of the orifice is eccentric before and after the series.