JPH06300185A - Orifice trap - Google Patents

Abstract

PURPOSE:To provide an orifice trap which is constituted to reduce the occurrence of leakage of steam and leakage of compressed air even when a drain amount is fluctuated and to which defective discharge of drain hardly occurs CONSTITUTION:A valve flow passage 3 is formed between an inlet 2 and an outlet 4. The valve flow passage 3 is formed in the shape of a loop having a desired curvature of radius. An outlet passage 5 communicated to an outlet 4 is formed on the outer peripheral side of the valve flow passage 3. A throttle part 6 is formed closer to the inlet 2 side than the outlet passage 5 of the valve flow passage 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orifice trap which is attached to a steam piping system or a compressed air piping system to discharge drainage as condensed water generated therein.

In steam piping systems and compressed air piping systems,
Drain is unavoidable, and so-called steam traps and air
Traps have been used. For these traps,
Float type traps have been used that open and close valves by detecting the difference in specific gravity between steam and compressed air and the drain, but these traps require a float or valve mechanism. , The number of parts becomes large, the mechanism becomes complicated, malfunction occurs after long-term use, steam or compressed air leaks, or conversely drainage occurs even if drainage occurs There was a case that it could not be done.

[0003]

2. Description of the Related Art Orifice traps as disclosed in, for example, JP-A-55-126195 have been 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 has an orifice member with a small diameter orifice installed, and by appropriately selecting the orifice diameter that matches the amount of drain generated, traps with almost no vapor leakage, compressed air leakage, or drain discharge failure It can be

[0004]

In the above-mentioned conventional orifice trap, when a certain amount of drain is continuously flowed in, only the drain is discharged and no vapor or compressed air leaks. However, if the drain inflow rate fluctuates, that is, if the drain inflow rate is less than the constant orifice downflow rate, steam leaks, and conversely, if the drain inflow rate exceeds the constant orifice downflow rate, the drain stays. I had a problem. This is because the orifice diameter in the orifice trap is a fixed value, and the amount of drainage fluctuates due to load fluctuations, differences between initial startup and steady operation, and the effects of outside air temperature. is there.

Therefore, a technical object of the present invention is to obtain an orifice trap in which vapor leakage and compressed air leakage are less likely to occur even when the drain inflow amount fluctuates, and drain discharge failure is less likely to occur.

[0006]

The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve flow passage and an outlet by valve casing, and to form a desired valve flow passage. Is formed in a loop shape having a radius of curvature of, and an outlet passage communicating with the outlet is communicated from the outer peripheral side of the valve passage of the loop shape, and at least one throttle portion is provided in the valve passage, The above-mentioned rule
It is a combination of the end portions of the valve passages.

[0007]

The operation of the above technical means is as follows.
The mixed fluid of drain and steam or compressed air that has flowed in from the inlet flows down while swirling in a loop-shaped valve passage having a desired radius of curvature. By turning, the drain with a large mass is located at the outer peripheral part of the loop valve passage,
It is preferentially discharged out of the system through an outlet passage provided on the outer peripheral side of the valve passage. The small-mass steam or compressed air swirls in the inner peripheral portion of the loop-shaped valve passage, and swirls in the loop-shaped valve passage again through the throttle portion. The drain generated by natural cooling by repeating the swirling is mixed with the drain flowing in from the inlet, and is discharged from the outlet passage to the outside of the system when a predetermined mass is reached.

When the amount of drainage flowing in is small, the loop-shaped valve flow passage is almost filled with steam or compressed air, and the swirling flow velocity becomes high, and the amount of drainage discharged from the outlet passage is increased. Also less. On the other hand, when the amount of inflow drain is large, the inside of the valve passage is filled with drain, the swirling flow velocity becomes slow, and most of it is discharged out of the system through the outlet passage.

[0009]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). An inlet 2, a valve passage 3 and an outlet 4 are formed in the valve casing 1 to form an orifice trap.
The inlet 2 is used by being connected to a steam using device or a compressed air pipe (not shown). One end of the valve passage 3 is connected to the inlet 2 and is formed in a loop shape having a desired radius of curvature according to use conditions such as a pressure difference between the inlet 2 and the outlet 4 and an inflow drain amount. An outlet passage 5 that connects the valve passage 3 and the outlet 4 is provided near the outlet 4 on the outer peripheral side of the valve passage 3. The throttle portion 6 is provided on the inlet 2 side of the outlet passage opening 8 of the valve passage 3 and the terminal portion 7 of the valve passage 3 is joined.

The operation of the above embodiment will be described. When the drain flows from the inlet 2, the inside of the valve flow path 3 is filled with the drain and a part of vapor or compressed air, and while flowing down the inside of the valve flow path 3, the drain is swept to the outer peripheral side of the valve flow path 3. Located in
The steam or compressed air is discharged to the outside from the outlet passage 5 through the throttle portion 6, further swirls in the loop-shaped valve passage 9, and is mixed with the drain from the inlet 2 in the throttle portion 6. In this case, the swirling steam or compressed air directs the inflowing drain toward the outlet passage 5 to promote drain discharge.

In the present embodiment, the loop length of the valve passage 3 reaching the outlet passage 5 is approximately half the loop, and the valve passage 9 after the outlet passage 5 is formed almost once. However, it may be a single loop or a plurality of loops depending on the use conditions such as pressure and drain amount.

[0012]

As described above, according to the present invention, even if the amount of drain flow into the orifice trap fluctuates, leakage of steam or compressed air is small, and defective drain discharge is less likely to occur. it can.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of the orifice trap of the present invention.

[Explanation of symbols]

 1 Valve casing 2 Inlet 3 Valve passage 4 Outlet 5 Outlet passage 6 Throttling portion 7 End portion

Claims (1)

[Claims] 1. An inlet, a valve flow path and an outlet are formed by valve casing, the valve flow path is formed in a loop shape having a desired radius of curvature, and the outer periphery of the loop shape valve flow path. An orifice characterized by communicating an outlet passage communicating with the outlet from the side, providing at least one throttle portion in the valve passage, and connecting the end portion of the loop valve passage to the throttle portion. trap.