JP2006170320A - Thermally-actuated steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermally-actuated steam trap capable of preventing steam leakage over a long time. <P>SOLUTION: An inlet 2, a valve chamber 4, and an outlet 3 are formed by a casing composed of a main body 1 and a lid member 5. A valve seat member 7 having a leading-out passage 6 is arranged between the valve chamber 4 and the outlet. A temperature control element 8 composed of a wall member 10, a diaphragm member 13, an expansion medium 12 sealed between both of them, bellows 16 whose one end is fixed to a valve member 15 side of the diaphragm member 13 by welding and which have a cylindrical shape, and a valve member 15 fixed to the other end of the bellows 16 by welding to displace and tilt freely in the axial direction is arranged in the valve chamber 4. The valve member 15 leaves and is seated on the valve seat member 7 by displacement of the diaphragm member 13 due to expansion and contraction of the expansive medium 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, by using a temperature control element including a medium that is heated, expanded, cooled, and contracted. The present invention relates to a thermally responsive steam trap that discharges fluid at a temperature below the system.

  The basic structure of the thermally responsive steam trap using the temperature control element is that a casing forms an inlet, a valve chamber, and an outlet, a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and a wall member And a diaphragm member, a temperature control element comprising an expansion medium sealed between the two and a valve member connected to the outlet side of the diaphragm member is disposed in the valve chamber, and the valve member is displaced by the displacement of the diaphragm member due to expansion and contraction of the expansion medium. Is separated from and seated on the valve seat member. In this type of steam trap, when the diaphragm member is displaced toward the valve seat member due to expansion of the expansion medium, the valve member may approach in a state of being inclined non-parallel to the valve seat member. When the valve member is seated on the valve seat member in such a state that the valve member is tilted in this manner, the valve member cannot shift to a state parallel to the valve seat member.

Therefore, conventionally, the diaphragm member and the valve member are connected by a universal joint. When the diaphragm member is displaced to the valve seat member side, the valve member approaches the valve seat member in an inclined state that is not parallel to the valve seat member. The valve member can be brought into close contact with the valve seat member and can be completely closed by tilting appropriately according to the seat member if necessary. However, the conventional one has a problem that steam leaks relatively early. This is because the valve member and the valve seat member are worn and deformed relatively early because the valve member is repeatedly seated on the valve seat member.
JP-A-9-79488

  The problem to be solved is to provide a thermally responsive steam trap that does not cause steam leakage over a long period of time.

  The thermally responsive steam trap of the present invention has an inlet, a valve chamber, and an outlet formed by a casing, a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the wall member and the diaphragm member are between the two. A temperature control element comprising an expansion medium sealed on the valve member and a valve member connected to the outlet side of the diaphragm member is disposed in the valve chamber. One end of the bellows is fixed to the valve member side of the diaphragm member, and the other end of the bellows. The valve member is fixed in an axially displaceable and tiltable manner, and the valve member is separated from and seated on the valve seat member by displacement of the diaphragm member due to expansion and contraction of the expansion medium.

  The present invention is capable of completely closing the valve member in close contact with the valve seat member, and can prevent wear and deformation of the valve member and the valve seat member. Produces a positive effect.

  The thermally responsive steam trap of the present invention has one end of a bellows fixed to the valve member side of the diaphragm member, and the valve member is fixed to the other end of the bellows so as to be displaced and tilted in the axial direction. The valve member is separated from and seated on the valve seat member by the displacement of the diaphragm member. Therefore, even if the valve member is seated on the valve seat member in a tilted state, the valve member is tilted appropriately according to the valve seat member, if necessary, so that the valve member comes into close contact with the movable valve seat and is completely closed. it can. Further, even if the valve member is repeatedly seated on the valve seat member, the bellows absorbs and softens the impact force generated by the seating on the valve member and the valve seat member, thereby preventing wear and deformation of the valve member and the valve seat member. . Therefore, there is no steam leakage over a long period.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is formed by a lid member 5 screwed to the main body 1. A casing is formed by the main body 1 and the lid member 5. A valve seat member 7 in which a lead-out path 6 for communicating the valve chamber 4 and the outlet 3 is formed is screwed to the opening end of the outlet 3 on the valve chamber 4 side. A temperature control element 8 is disposed above the valve seat member 7. The temperature control element 8 includes an upper wall member 10 having an inlet 9, a plug member 11 that seals the inlet 9, a diaphragm member 13 that seals the expansion medium 12 between the upper wall member 10, and a diaphragm member A lower wall member 14 which is fixed by welding with the outer peripheral edge of 13 being sandwiched between the upper wall member 10 and a cylindrical bellows 16 having one end (upper end) fixed to the valve member 15 side of the diaphragm member 13 by welding. The valve member 15 is fixed to the other end (lower end) of the bellows 16 by welding in an axially displaceable manner. The expansion medium 12 is made of an alcohol such as propanol having a lower boiling point than water, a mixture of alcohols having a lower boiling point than water, or a mixture of alcohol and water having a lower boiling point than water. The lead-out path 6 is opened and closed by causing the valve member 15 to be separated from and seated on the valve seat member 7 by the displacement of the diaphragm member 13 due to the expansion and contraction of the expansion medium 12.

  The temperature control element 8 is housed in a bottomed cylindrical mounting member 18 fixed between the main body 1 and the valve seat member 7, and is attached by a biasing force of a spring 19 fixed to the mounting member 18. The lower surface of the lower wall member 14 is held in contact with the step portion 20 of the member 18. The attachment member 18 has a fluid passage hole 21 in the bottom wall and three fluid passage windows 22 in the peripheral wall.

  The operation in this embodiment is as follows. At the time of starting, the inside of the valve chamber 4 is low temperature, the expansion medium 12 contracts, the valve member 15 and the diaphragm member 13 are displaced upward by the fluid pressure on the inlet 2 side, and the valve member 15 is separated from the valve seat member 7. Thus, the lead-out path 6 is opened. As a result, low-temperature condensate or air flowing in from the inlet 2 is discharged from the outlet path 6 to the outlet 3. When the temperature of the fluid flowing in from the inlet 2 increases due to the discharge of the low-temperature fluid, the expansion medium 12 expands, and the valve member 15 and the diaphragm member 13 are displaced downward against the fluid pressure on the inlet 2 side. The member 15 approaches the valve seat member 7, and the valve member 15 is seated on the valve seat member 7 to close the outlet path 6. This prevents steam leakage. When the temperature in the valve chamber 4 decreases due to heat radiation, the expansion medium 12 contracts and the valve member 15 and the diaphragm member 13 are displaced upward by the fluid pressure on the inlet side, and the valve member 15 is separated from the valve seat member 7. The lead-out path 6 is opened.

  Even if the valve member 15 is seated on the valve seat member 7 in a tilted state, the valve member 15 is properly tilted according to the valve seat member 7 so that the valve member 15 is brought into close contact with the valve seat member 7. Can be completely closed. Even if the valve member 15 is repeatedly seated on the valve seat member 7, the bellows 16 absorbs and softens the impact force generated on the valve member 15 and the valve seat member 7 by the seating, so that the valve member 15 and the valve seat member 7 Can prevent wear and deformation. Therefore, there is no steam leakage over a long period.

Sectional drawing of the thermally responsive steam trap of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Valve chamber 5 Lid member 6 Lead-out path 7 Valve seat member 8 Temperature control element 10 Upper wall member 12 Expansion medium 13 Diaphragm member 14 Lower wall member 15 Valve member 16 Bellows 18 Mounting member

Claims (1)

An inlet, a valve chamber, and an outlet are formed by a casing, a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the wall member and the diaphragm member are sealed between the two and the expansion medium and the diaphragm member are led out. A temperature control element comprising a valve member connected to the road side is disposed in the valve chamber, and one end of the bellows is fixed to the valve member side of the diaphragm member, and the valve member is displaced in the axial direction to the other end of the bellows. A thermally responsive steam trap, which is fixed in a tiltable manner and causes the valve member to be separated from and seated on the valve seat member by displacement of the diaphragm member due to expansion and contraction of the expansion medium.

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