JP4334689B2 - Float type drain trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses the difference in specific gravity between gas and liquid to drive the valve means with an open or closed float to open and close the valve hole, thereby condensate and condensed water generated in steam, compressed air, and gas piping systems. In particular, the present invention relates to a float type drain trap that automatically discharges drain such as a valve having a normally open orifice separately from a valve hole to increase the drain discharge capacity.
[0002]
[Prior art]
The above-described float type drain trap is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-141593. As understood from the publication, a valve chamber is formed in a casing having an inlet and an outlet, a valve hole and an orifice communicating with the valve chamber and the outlet are provided in a lower portion of the valve chamber, and a valve member formed by a float disposed in the valve chamber. Is used to open and close the valve hole, and a drain opening capacity is increased by providing a normally open orifice separately from the valve hole opened and closed by the float.
[0003]
[Problems to be solved by the invention]
The above-mentioned conventional float type drain trap is excellent in that the drain discharge capacity can be increased. However, since the passage area of the orifice is constant, the fluid on the inlet side is particularly at the initial startup of the piping system. When the pressure is low and a large amount of drain is generated, it takes time to discharge the drain, leaving room for improvement.
[0004]
Therefore, the technical problem of the present invention is to provide a float drain trap capable of quickly discharging a large amount of low-pressure drain.
[0005]
[Means for Solving the Problems]
The technical means of the present invention devised to solve the above technical problem is that a valve chamber is formed in a casing having an inlet and an outlet, and a valve hole communicating the valve chamber and the outlet is provided in the lower portion of the valve chamber. In addition to the valve hole, an orifice communicating with the valve chamber and the outlet is provided in the lower part of the valve chamber, and the valve member is driven by a float arranged in the valve chamber to open and close the valve hole. provided said orifice to a pressure responding member to be brought into place in the lower valve chamber, fixed to the diaphragm member for changing the passage area of the orifice provided in the pressure-responsive member by advancing and retracting the pressure-responsive member facing the orifice The float type drain trap is provided in the above.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The float type drain trap of the present invention is provided with an orifice in a pressure responsive member that is advanced and retracted by an inlet side fluid pressure and a spring and disposed at the lower part of the valve chamber, and a throttle member that changes the passage area of the orifice by the advance and retreat of the pressure responsive member. Since the fluid pressure on the inlet side is low, the pressure response member is displaced to the opposite side of the throttle member to increase the passage area of the orifice. The low-pressure condensate can be quickly discharged from the orifice.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 shows a cross-sectional view of the float drain trap of the present invention. This embodiment is applied to a free float type steam trap. The casing of the free float type steam trap is formed by a main body 1 and a lid body 2 fastened to the main body 1, and has a valve chamber 3 therein. The main body 1 has an inlet 4, an outlet passage 5 and an outlet 6, and the inlet 4 communicates with the upper portion of the valve chamber 3.
[0008]
A valve seat 8 having a valve hole 7 is formed in the lower side wall of the valve chamber 3. The lower part of the valve chamber 3 communicates with the outlet 6 through the valve hole 7 and the outlet passage 5. A hollow spherical float 9 that opens and closes the valve hole 7 is disposed in the valve chamber 3 in a free state. A float seat 10 with which the float 9 abuts at a position where the valve hole 7 is closed is provided below the float 9.
[0009]
A piston 12 as a pressure responsive member having an orifice 11 communicating with the valve chamber 3 and the outlet 6 is disposed below the valve chamber 3 so as to be able to advance and retract. The piston 12 keeps the airtightness between the outer periphery thereof and the inner periphery of the main body 1 and communicates the valve chamber 3 to the outlet 6 side only through the orifice 11. In addition to the piston, a diaphragm or the like can be used as the pressure responsive member. A throttle member 13 fixed to the main body 1 is disposed on the outlet 6 side of the orifice 11 so as to face the orifice 11. A spring 14 is disposed between the piston 12 and the throttle member 13 to displace the piston 12 on the side opposite to the throttle member 13. The piston 12 is displaced to the opposite side of the throttle member 13 when the fluid pressure on the inlet 4 side is low to increase the passage area of the orifice 11, and is displaced to the throttle member 13 side when the fluid pressure on the inlet 4 side is high. The passage area of the orifice 11 is reduced. The throttling member 13 is provided with a through hole 15 for communicating the orifice 11 to the outlet 3 side.
[0010]
The operation of the free float steam trap of the above embodiment is as follows. When the fluid pressure on the inlet side is low and a large amount of drain flows into the valve chamber 3 as in the initial startup of the steam piping system, the piston 12 is displaced to the opposite side of the throttle member 13 by the spring 13. The passage area of the orifice 11 is increased. The float 9 floats to open the valve hole 7. As a result, a large amount of drainage is quickly discharged from the orifice 11 and the valve hole 7 to the outlet 6.
[0011]
When the pressure of the drain that flows into the valve chamber 3 increases due to the discharge of the low-pressure drain, the piston 12 is displaced toward the throttle member 13 to reduce the passage area of the orifice 11, and the drain is discharged from the orifice 11 to the outlet 6. Further, the float 9 rises and falls according to the amount of drain in the valve chamber 3 to open and close the valve hole 7, and the drain is discharged from the valve hole 7 to the outlet 6.
[0012]
In the above embodiment, the present invention is applied to the free float type steam trap, but can also be applied to a lever float type steam trap. Further, it can be applied not only to a float type steam trap but also to a float type air trap or a float type gas trap.
[0013]
【The invention's effect】
The present invention produces the following specific effects.
As described above, according to the present invention, when the fluid pressure on the inlet side is low and a large amount of drain is generated as in the initial startup of the piping system, the pressure responsive member is displaced to the side opposite to the throttle member. By increasing the passage area of the orifice, an excellent effect that a large amount of low-pressure drain can be discharged quickly is produced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment in which a float drain trap of the present invention is applied to a free float steam trap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve chamber 4 Inlet 6 Outlet 7 Valve hole 8 Valve seat 9 Float 11 Orifice 12 Piston 13 Throttle member 14 Spring

Claims (1)

A valve chamber is formed in a casing having an inlet and an outlet, and a valve hole that communicates the valve chamber and the outlet is provided in the lower portion of the valve chamber, and an orifice that communicates the valve chamber and the outlet is provided in the lower portion of the valve chamber. in those opening and closing the valve hole by driving the valve member in the float disposed in the valve chamber, is arranged in the lower valve chamber provided with the orifice to a pressure responding member to be brought forward and backward by the inlet side fluid pressure and the spring, pressure-responsive float drain trap, characterized in that the stop member for varying the passage area of the orifice provided in the pressure-responsive member arranged to fixedly facing the orifice by reciprocating the member.

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