JPH08278000A - Steam trap device - Google Patents

Abstract

PURPOSE: To prevent a foreign matter from being discharged from the outlet by surely capturing the foreing matter contained in drain by means of a cylindrical filter inside a Y-shaped strainer, to which the drain is introduced from its inlet so as to be discharged from its outlet. CONSTITUTION: Orifices 23, 24 consisting of small diameter holes 21, 22 are arranged in the insides of an inlet 11 and an outlet 12 in a Y-shaped strainer 10 provided with the drain inlet 11, the drain outlet 12, a branch port 13, and a cylindrical filter 14 whose end parts are respectively connected to the inlet 11 and to the branch port 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam using device and an orifice type steam trap device which is connected to a steam piping system to discharge generated drain.

[0002]

2. Description of the Related Art A drain inlet and a drain outlet
A steam trap device in which an orifice trap is connected to the outflow port of a Y-shaped strainer having a bifurcation port and a cylindrical filter having the inflow port and each end connected to the bifurcation port is known from Japanese Patent Laid-Open No. 4-95694. is there. This steam trap device filters foreign matter such as iron powder and rust that clogs the orifice in the orifice trap by filtering the drain flowing from the inlet with a filter, and only the drain passes through the outlet and the orifice trap Supply and discharge. However, there is still foreign matter that penetrates the cylindrical filter, and the foreign matter may block the orifice of the orifice trap.Therefore, connect the ejector to the branch port and the opening / closing valve downstream of it, and connect the ejector suction chamber to the orifice trap. The inlet side before the orifice is connected with a communication pipe, and when the orifice is blocked by foreign matter, the on-off valve is opened, and the entire amount of drain flowing from the inlet into the Y-shaped strainer is passed through the inside of the cylindrical filter and the branch to the ejector. The foreign matter blocked in the orifice is sucked and removed by the negative pressure generated in the suction chamber of the ejector.

[0003]

In the above conventional apparatus, it is impossible to determine whether the orifice of the orifice trap is blocked by foreign matter or not. Therefore, the drain is not discharged and stays in the steam trap and a water hammer phenomenon occurs in the steam piping system. Or
In the steam using device, when the heat transfer coefficient is lowered, the orifice is blocked by the foreign matter and the foreign matter is sucked and removed by opening the on-off valve, so that it can only be used as a symptomatic treatment.

[0004]

SUMMARY OF THE INVENTION The present invention focuses on the fact that a high pressure causes foreign matter to pass through the filter without being caught by the cylindrical filter of the Y strainer. Keeping the pressure low, foreign matter was reliably prevented from passing through the cylindrical filter, and the problems of the conventional device were solved.The drain inlet, the drain outlet, the branch outlet, and the inlet And a Y-shaped strainer having a cylindrical filter with each end connected to the branch port, an orifice having a small diameter hole is provided inside the inflow port and the outflow port. It is more effective to connect an orifice trap to the drain outlet of the Y-shaped strainer.

[0005]

1 is a sectional view of an embodiment of claim 1 of the present invention, and FIG. 2 is a sectional view of an embodiment of claim 2 of the present invention, in which 10 is a drain inlet 11 and a drain. Outlet 12
2 shows a Y-shaped strainer having a branch port 13 and a tubular filter 14 having the ends thereof connected to the inflow port 11 and the branch port 13. As is well known, the cylindrical filter has a large number of small holes in which the filter is stretched on a cylindrical surface. An opening / closing valve 15 such as a ball valve is connected to the branch port 13 and is normally closed. The drain flows into the cylindrical filter 14 through the inflow port 11, and the foreign matter such as iron powder and rust contained when the drain exits the hollow portion of the Y-shaped strainer from the small hole formed in the cylindrical surface where the filter is stretched is filtered. Captured in. The drain from which the foreign matter has been removed in this way is discharged from the hollow portion of the Y-shaped strainer through the outflow port 13.

When the pressure of the drain flowing into the inside of the cylindrical filter 14 through the inflow port 11 is high, some foreign matter contained in the drain penetrates through the filter formed in the small hole of the cylindrical surface and becomes drain. When the orifice trap is connected to the outlet for discharging a certain amount of drain continuously, the foreign matter blocks the orifice of the orifice trap.

The inlet of the conventional Y strainer has a female threaded socket for connecting the upstream pipe of the drain,
The inlet is open with the same diameter as the female thread of the socket. Further, the outlet also has a downstream pipe of the drain and a socket with a female screw for connecting an orifice trap, and the outlet is opened with a diameter substantially the same as the female screw of the socket.

On the other hand, in the present invention, the inlet and the outlet of the Y-shaped strainer have sockets 16 and 17 with female threads, respectively, but orifices 23 and 24 having small diameter holes 21 and 22 at the center of the sockets are provided at the back of the sockets. Is provided.

The diameter of the small-diameter hole 21 of the orifice 23 inside the inflow port 11 is the minimum diameter that prevents foreign matter from clogging, that is, 2.
It is preferably about 5 to 3 mm. Also, the outlet 12
The diameter of the small diameter hole 22 of the internal orifice 24 is the same as or smaller than the small diameter hole of the inlet when the orifice trap is not connected to the outlet, 0.5 to 3 mm, and the inlet when the orifice trap is connected. Same as the small diameter hole of 2.5 ~
It is preferably 3 mm.

In this way, the inlet 11 of the Y-shaped strainer
And an orifice 23 having a small diameter hole 21 at the outlet 12.
When the orifice 24 having the small diameter hole 22 is provided, the drain flowing from the inflow port 11 through the small diameter hole 21 into the cylindrical orifice adiabatically expands in a large space inside the Y-shaped strainer, and the pressure drops. Therefore, the tubular filter 14
Since the pressure of the drain passing through the filter formed in the small hole on the cylindrical surface of the drain becomes low, all the foreign matter contained in the drain is trapped by the filter and does not flow out into the hollow portion of the Y-shaped strainer and flow to the outlet. Absent.

When the orifice trap 18 is connected to the outlet 12 provided with the orifice 24 composed of the small-diameter hole 22 according to the second aspect, another decompression chamber is provided between the small-diameter outlet and the orifice 19 of the orifice trap. 20 is formed. Therefore, the pressure of the drain flowing from the inflow port 11 through the small-diameter hole 21 into the cylindrical orifice and exiting from the small hole of the cylindrical surface on which the filter of the cylindrical orifice is stretched further decreases, and is contained in the drain. Foreign matter is more effectively captured by the filter.

The ball valve 1 connected to the branch port 13
Reference numeral 5 is opened periodically, and a drain flowing from the inflow port to the branch port through the tubular filter removes and discharges the foreign matter captured by the filter provided in the small hole on the cylindrical surface of the tubular filter.

Inlet 11 and outlet 1 of the Y-shaped strainer
In order to provide an orifice having a small diameter hole with 2, a Y-shaped strainer may be integrally molded with a mold and then a hole may be formed, or an orifice plate may be screwed into the Y-shaped strainer.

[0014]

As is apparent from the above, according to the steam trap device of the present invention, the foreign matter contained in the drain is reliably captured by the cylindrical filter of the Y-shaped strainer and discharged from the outlet. Never. Therefore, it is possible to reliably prevent a water hammer phenomenon in the steam piping system and a decrease in heat transfer coefficient in the steam using device.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of claim 1 of the present invention.

FIG. 2 is a sectional view showing an embodiment of claim 2 of the present invention.

[Explanation of symbols]

 10 Y-type strainer 11 Drain inflow port 12 Drain outflow port 13 Branch port 14 Cylindrical filter 18 Orifice trap 21 Small inlet hole 22 Small outlet hole 23 Inlet orifice 24 Outlet orifice

Claims (2)

[Claims] 1. A drain inlet and a drain outlet,
A steam having a Y-shaped strainer having a branch port and a cylindrical filter having ends connected to the branch port and an orifice formed of a small diameter hole is provided inside the inflow port and the outflow port. Trap device. 2. The steam trap device according to claim 1, wherein an orifice trap is connected to the drain outlet.