JP4334690B2 - 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 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, but since the passage area of the orifice is constant, a low temperature drain is generated particularly at the initial startup of the piping system. When it was generated in large quantities, drainage took time, leaving room for improvement.
[0004]
Therefore, the technical problem of the present invention is to provide a float type drain trap capable of quickly discharging a large amount of low temperature 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. , valve hole provided in the valve chamber bottom an orifice separately communicating the valve chamber and the outlet and, in that opening and closing the valve hole by driving the valve member in the float disposed in the valve chamber, said communicating valve chamber and the outlet It provided the valve chamber bottom to be able to advance and retreat the orifice member having an orifice, fixed to the outlet side of the orifice of the diaphragm member to vary the passage area of the orifice provided in the orifice member by advancing and retracting of the orifice member facing the orifice manner provided, to the consolidation temperature responding member in the orifice member as in response to the fluid temperature on the inlet side to increase the passage area of the orifice at low temperatures to reduce at high temperatures Float drain trap, characterized. It is in.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the float drain trap of the present invention, an orifice member having an orifice communicating with a valve chamber and an outlet is provided in a lower portion of the valve chamber so that the orifice member can be moved forward and backward, and a throttle member that changes the passage area of the orifice by the advancement and retraction of the orifice member faces the orifice. The temperature-responsive member is connected to the orifice member so that the passage area of the orifice increases at low temperatures and decreases at high temperatures in response to the fluid temperature on the inlet side. A large amount of low-temperature condensate can be quickly discharged from the orifice by displacing it to the opposite side of the member to increase the passage area of 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]
An orifice member 12 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 retreat. The orifice member 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. 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 coil-shaped shape memory alloy 14 as a temperature responsive member is disposed between the orifice member 12 and the throttle member 13. The shape memory alloy 14 expands at a low temperature and displaces the orifice member 12 to the side opposite to the throttle member 13 to increase the passage area of the orifice 11, and contracts at a high temperature to displace the orifice member 12 to the throttle member 13 side. At least 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 a large amount of low-temperature drain flows into the valve chamber 3 as in the initial start-up of the steam piping system, the shape memory alloy 14 expands and the orifice member 12 is displaced to the opposite side of the throttle member 13 so that the orifice 11 passage area is enlarged. The float 9 floats and opens the valve hole 7. Thereby, a large amount of low-temperature drain is quickly discharged from the orifice 11 and the valve hole 7 to the outlet 6.
[0011]
When the temperature of the drain that flows into the valve chamber 3 increases due to the discharge of the low-temperature drain, the shape memory alloy 14 contracts to displace the orifice member 12 toward the throttle member 13, thereby reducing the passage area of the orifice 11. The gas 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, an excellent effect that a large amount of low-temperature drain can be quickly discharged is obtained by changing the passage area of the orifice by the temperature responsive member that is responsive to the fluid temperature.
[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 Orifice member 13 Throttle member 14 Shape memory alloy

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, an orifice member capable valve chamber lower reciprocating with said orifice which communicates the valve chamber and the outlet, the advance and retreat of the orifice member the stop member for varying the passage area of the orifice provided in the orifice member facing the orifice fixedly provided at the outlet side of the orifice, the low-temperature passage area of the orifice in response to the fluid temperature on the inlet side A float-type drain trap characterized in that a temperature-responsive member is connected to an orifice member so that it is sometimes large and small at high temperatures.

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