JP4808329B2 - Orifice type steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap that automatically discharges condensate condensed with steam generated in a steam piping system such as a steam transport pipe or a steam-using device, and particularly to a small-diameter throttle portion that is always open. The present invention relates to an orifice type steam trap that discharges condensate from water.
[0002]
[Prior art]
As a conventional orifice type steam trap, for example, the one shown in Japanese Patent Laid-Open No. 10-176790 has been used. This is because a disc-like valve body 11 is arranged in the valve chamber 5 and the valve body 11 is urged by a coil spring 12 in a direction away from the valve seat portion 10, and the lower end of the valve seat portion 10. Is provided with an orifice 13 for communicating the inlet 3 and the outlet 4. When the fluid pressure is low, the valve body 11 is separated from the valve seat portion 10 by the spring force of the coil spring 12 to open a large valve opening. By doing so, a large amount of low-pressure condensate can be discharged without stagnation.
[0003]
[Problems to be solved by the invention]
In the conventional orifice type steam trap, the valve body can open the valve opening and discharge a large amount of condensate at low pressure, but once the valve body is closed, the diameter of the orifice communicating the inlet and the outlet Because the length is constant, when the pressure difference before and after the orifice or the inflow of condensate fluctuates, the condensate cannot be discharged reliably, or conversely, a large amount There was a problem of leaking the steam to the outlet side.
[0004]
Accordingly, an object of the present invention is to provide an orifice type that can discharge condensate without stagnation and does not leak a large amount of steam even if the pressure difference before and after the orifice or the inflow amount of condensate fluctuates. To provide a steam trap.
[0005]
[Means for Solving the Problems]
The means of the present invention taken in order to solve the above problem is that the trap casing is sequentially formed with an inlet, a valve chamber and an outlet, and a throttle portion having a smaller diameter than the inlet and outlet passages is formed in the valve chamber. The throttling portion is formed by a gap between the crest diameter or trough diameter of the female screw and the trough diameter or crest diameter of the male screw.
[0006]
Further, the present invention is that the passage length of the constricted portion is obtained by adjustable by advancing and retracting the male screw.
[0008]
Further, the present invention is obtained by arranging a plurality of throttle portions in series.
[0009]
In the present invention , a diameter-enlarged portion having a passage area larger than that of the throttle portion is provided between the plurality of throttle portions.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
By forming the throttle part with a gap between the female thread crest or valley diameter and the male thread crevice or crest diameter, an orifice type steam trap that discharges condensate through this gap can be obtained.
[0011]
Condensate water quantity or variation coming inflow, or if the pressure difference is varied, the or adjust the path length of the throttle portion, or to place an aperture portion in series, between the throttle portion throttle portion By providing the enlarged diameter portion, the condensate can be quickly discharged without stagnation, and the steam can be prevented from leaking to the outside.
[0012]
【Example】
In the present embodiment, an example in which a plurality of throttle portions are arranged in series is shown. In FIG. 1, a substantially cylindrical main body 1 and a lid member 2 are screwed together to form a trap casing, and an inlet 3, a valve chamber 4 and an outlet 5 are provided, respectively. The inlet 3 and the valve chamber 4 communicate with each other through a passage 6, and a throttle portion 7 is provided below the valve chamber 4 to communicate with the outlet 5 at the lower end.
[0013]
The restricting portion 7 includes a female screw 8 formed continuously with the main body 1, and a first male screw 10 and a second male screw 11 formed at the lower end of an adjusting screw 9 attached to the lid member 2 so as to be movable up and down. The crests of the male threads 10 and 11 are cut flat, and a continuous gap 12 is provided between the male threads 8 and the orifice 12 is used as an orifice type steam trap.
[0014]
An enlarged diameter portion 14 having a larger passage area than the gap 12 is provided between the male screws 10 and 11. In this enlarged diameter portion 14, a part of the condensate flowing down through the gap 12 of the first male screw 10 becomes re-evaporated steam, and the raw steam that is the original steam flowing in from the inlet 3 flows to the outlet 5. It serves to prevent leakage.
[0015]
The adjusting screw 9 can be displaced up and down to arbitrarily adjust the passage length of the gap 12 by rotating a hexagon bolt 13 that passes through the lid member 2 and is connected to the outside. The state shown in FIG. 1 is a state in which both the first male screw 10 and the second male screw 11 are substantially engaged with the female screw 8 and are close to the longest gap 12 passage distance.
[0016]
When a mixed fluid of condensate and steam flows from the inlet 3, the fluid is discharged from the gap 12 to the outlet 5, and the distance of the gap 12 is increased in accordance with changes in the amount of condensate flowing in and the pressure. By shortening or shortening, the leakage of steam to the outlet 5 can be reduced, and the condensate can be discharged quickly.
[0017]
By moving the adjustment screw 9 upward from the state shown in FIG. 1, the passage distance of the gap 12 is shortened. When the adjustment screw 9 is displaced to the upper end, both male screws 10 and 11 reach the valve chamber 4. The throttle portion 7 has only a female screw 8 and can communicate the inlet 3 and outlet 5 with a large passage. When a large amount of condensate flows in at the time of initial startup of the equipment using steam, or when foreign matter such as iron rust is clogged in the gap 12, remove the male screws 10 and 11 from the female screw 8 as described above. By blowing the water, a large amount of condensate can be discharged quickly and foreign substances can be excluded from the system.
[0020]
In the present embodiment, the gap 12 between the female screw 8 and the male screws 10 and 11 is shown as having a constant passage area. For example, the cut area at the top of the mountain of the male screws 10 and 11 is appropriately set. It is possible to adjust the passage area of the gap 12 by changing or by tapering the female screw or the male screw.
[0021]
【The invention's effect】
As described above, according to the present invention, by adjusting the gap between the female screw and the male screw arbitrarily, the condensate is retained even if the pressure difference before and after the orifice as the throttle portion or the inflow amount of the condensate fluctuates. The orifice type steam trap can be discharged without causing a large amount of steam to leak.
[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 Main body 2 Lid member 3 Inlet 4 Valve chamber 5 Outlet 7 Restriction part 8 Internal thread 9 Adjustment screw 10 1st external thread 11 2nd external thread 12 Gap 14 Wide diameter part

Claims (1)

In the trap casing, an inlet, a valve chamber, and an outlet are sequentially formed, and a throttle portion having a smaller diameter than the inlet and outlet passages is formed in the valve chamber. or formed with a gap between the major diameter, the passage length of the narrowed portion, and adjustable by advancing and retracting the male screw in adjusting screw mounted vertically movably in the trap casing, the diaphragm portion in series and arranging a plurality Rutotomoni provided a large diameter portion of the passage area of the stop portion between the plurality of aperture portions, when displacing the adjustment screw until the upper male screw reaches the valve chamber, the diaphragm portion only female thread An orifice type steam trap characterized by being formed by

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