JP5411592B2 - Thermally responsive steam trap - Google Patents

Description

The present invention relates to a thermally responsive steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes using a temperature control element including an expansion / contraction medium that expands when heated and contracts when cooled and contracts. About.

A conventional thermally responsive steam trap is disclosed in Patent Document 1, for example. This consists of a casing that forms an inlet, a valve chamber and an outlet, a valve seat member having a valve hole communicating with the valve chamber on the outlet side is formed between the valve chamber and the outlet, and the valve member is driven by an expansion and contraction medium. An upper valve that opens and closes the upper valve seat and the lower valve seat at the same time by forming a valve seat member with a pair of upper and lower valve seats A valve member is formed by a body and a lower valve body, and fluid pressures acting on the valve member are acted symmetrically to cancel each other so that a large valve hole can be opened and closed.

Japanese Patent Application Laid-Open No. 5-263939

In the above-mentioned conventional heat-responsive steam trap, it is difficult to manufacture the upper valve body and the lower valve body so that they can be seated on the upper valve seat and the lower valve seat at the same time, and there is a problem that the above is easily leaked. .

Therefore, the problem to be solved by the present invention is to provide a thermally responsive steam trap that can open and close a large valve opening by offsetting the fluid pressure acting on the valve member without leaking steam.

In order to solve the above-described problems, the thermally responsive steam trap of the present invention includes a valve seat member having a valve hole that forms an inlet, a valve chamber, and an outlet in a casing and communicates the valve chamber with the outlet side. A temperature control element formed between the outlet and the valve member is driven by an expansion / contraction medium to open and close the valve hole is disposed in the valve chamber. The valve seat member has a cylindrical shape and both ends open to the valve chamber. At the same time, the periphery communicates with the outlet through a discharge hole. The valve member is cylindrical and has one end opened and the other end closed with a wall member. The annular valve surface on the one end opening side opens and closes the valve hole on the one end opening side of the valve seat member. In addition, the outer periphery on the other end wall member side is hermetically slid on the inner periphery on the other end opening side of the valve seat member.

According to the present invention, the valve seat member has a cylindrical shape and both ends open to the valve chamber and the periphery communicates with the outlet through the discharge hole. The valve member has a cylindrical shape with one end opened and the other end closed by the wall member. The annular valve surface on the one end opening side opens and closes the valve hole on the one end opening side of the valve seat member, and the outer periphery on the other end wall member side airtightly slides on the inner periphery on the other end opening side of the valve seat member. Therefore, the fluid pressure acting on one end of the valve member or one surface of the wall member and the other surface of the wall member is caused to act symmetrically to cancel each other, and steam is passed through the large valve hole of the valve seat member on the annular valve surface of the valve member. There is an effect that it can be opened and closed without leaking.

It is sectional drawing of the thermally responsive steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A lid 4 is fastened to a main body 3 having an inlet 1 and an outlet 2 to constitute a casing having a valve chamber 6 therein. A valve seat member 7 is attached to the main body 3 of the valve chamber 6 with screws (not shown). The valve seat member 7 is cylindrical and has both ends opened to the valve chamber 6, and the periphery communicates with the outlet 2 through the discharge hole 8. A valve hole 9 communicating with the valve chamber 6 and the outlet 2 is formed on one end opening side of the valve seat member 7, and a sliding portion 10 is formed on the inner periphery on the other end opening side. An airtight O-ring 11 is disposed on the sliding portion 10.

A temperature control element 12 is disposed in the valve chamber 5. The temperature control element 12 includes an upper wall member 13, a diaphragm member 15 in which an expansion / contraction medium 14 is sealed between the upper wall member 13, a valve member 16 fixed to the diaphragm member 15, and an outer peripheral edge of the diaphragm member 15. And a lower wall member 17 fixed between the upper wall member 13 and the upper wall member 13. The expansion / contraction medium 14 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. The valve member 16 is formed in a cylindrical shape by opening one end and closing the other end with a wall member 18. In the valve member 16, the annular valve surface 19 on the one end opening side opens and closes the valve hole 9 on the one end opening side of the valve seat member 7, and the outer periphery on the other end wall member 13 side is on the other end opening side of the valve seat member 7. The sliding part 10 on the inner periphery slides in an airtight manner.

The operation of the above-mentioned heat-responsive steam trap is as follows. At startup, the inside of the valve chamber 6 is at a low temperature, the expansion / contraction medium 14 contracts, the diaphragm member 15 is displaced upward, and the valve member 16 opens the valve hole 9. As a result, low-temperature condensate or air flowing into the valve chamber 3 from the inlet 1 is discharged from the valve hole 9 to the outlet 2 through the discharge hole 8. When the temperature of the fluid flowing in from the inlet 1 rises due to the discharge of the low-temperature fluid and the inside of the valve chamber 6 reaches a predetermined temperature or more, the expansion / contraction medium 14 expands, the diaphragm member 15 is displaced downward, and the valve member 16 becomes the valve hole. Close 9 This prevents steam leakage. When the inside of the valve chamber 6 falls below a predetermined temperature due to heat radiation, the expansion / contraction medium 14 contracts, the diaphragm member 15 is displaced upward, and the valve member 16 opens the valve hole 9. By causing the fluid pressures acting from below and above the valve member 16 to act symmetrically and cancel each other, the large valve hole 9 can be opened and closed by the valve member 16 without leaking steam.

The present invention can be used for all types of thermally responsive steam traps that open and close valve holes using temperature control elements.

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Lid body 6 Valve chamber 7 Valve seat member 8 Discharge hole 9 Valve hole 10 Sliding part 12 Temperature control element 14 Expansion / contraction medium 15 Diaphragm member 16 Valve member 18 Wall member 19 Annular valve surface

Claims (1)

A valve seat member having a valve hole that communicates the valve chamber with the outlet side is formed between the valve chamber and the outlet, and the valve member is driven by an expansion / contraction medium to control the valve. In the case where the temperature control element for opening and closing the hole is arranged in the valve chamber, the valve seat member has a cylindrical shape and both ends open to the valve chamber and the periphery communicates with the outlet through the discharge hole, and the valve member has a cylindrical shape and one end. The other end of the valve seat member opens and closes the valve hole on the one end opening side of the valve seat member, and the outer periphery of the other end wall member side is on the other end opening side of the valve seat member. Thermally responsive steam trap characterized by sliding inside the airtight.

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