JP4372485B2 - Thermally responsive steam trap - Google Patents

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 a fluid having a temperature below the system.

  A conventional thermally responsive steam trap using a temperature control element has an inlet, a valve chamber, and an outlet formed by a valve casing, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet. Two wall members, two upper and lower diaphragm members each having an outer peripheral edge fixed between both wall members, a first expansion medium sealed between the upper wall member and the upper diaphragm member, an upper diaphragm member and a lower diaphragm member, In which a temperature control element comprising a second expansion medium sealed between and a valve member disposed on the outlet path side of the lower diaphragm member is disposed in the valve chamber, the first expansion medium has a boiling point higher than that of water or water. The first expansion is composed of a low alcohol or a mixture thereof and the second expansion medium is an alcohol having a lower boiling point than water or a mixture thereof or a mixture of water and an alcohol having a lower boiling point than water. Than the body in which the boiling point is formed lower.

When the valve is closed, the second expansion medium and the first expansion medium are expanded in this order to gradually displace the diaphragm member toward the valve seat member side, and the valve member closes the lead-out path. The first and second expansion media are contracted in this order, and the diaphragm member is gradually displaced in a direction away from the valve seat member so that the valve member opens the lead-out path, thereby opening and closing the operation stepwise. It won't happen suddenly. However, in the case of the above prior art, if the lower diaphragm member is broken, the alcohol forming the second expansion medium leaks from the temperature control element. There was a problem that led to
Japanese Patent No. 2884316

  The problem to be solved is to provide a thermally responsive steam trap that does not leak alcohol from the temperature control element even if the lower diaphragm member is broken.

  In the present invention, an inlet, a valve chamber, and an outlet are formed by a valve casing, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the two upper and lower wall members are disposed between the two wall members. Two upper and lower diaphragm members with fixed peripheral edges, a first expansion medium sealed between the upper wall member and the upper diaphragm member, a second expansion medium sealed between the upper diaphragm member and the lower diaphragm member, In a thermally responsive steam trap in which a temperature control element comprising a valve member disposed on the outlet path side of the diaphragm member is disposed in the valve chamber, the first expansion medium has an alcohol having a lower boiling point than water or an alcohol having a lower boiling point than water Or a mixture of alcohol having a boiling point lower than that of water and water, and the second expansion medium is made of water.

  The present invention has an excellent effect that alcohol does not leak from the temperature control element even if the diaphragm member is broken.

  In the thermoresponsive steam trap of the present invention, the first expansion medium is composed of an alcohol having a boiling point lower than that of water, a mixture of alcohols having a boiling point lower than water, or a mixture of alcohol having a boiling point lower than water and water. The expansion medium consists of water. Therefore, when the valve is closed, the first expansion medium and the second expansion medium are expanded in this order to gradually displace the diaphragm member toward the valve seat member side, and the valve member closes the lead-out path. When the valve is opened, the second expansion medium and the first expansion medium are contracted in this order and the diaphragm member is gradually displaced in a direction away from the valve seat member, so that the valve member opens the lead-out path. When the lower diaphragm member is damaged, the second expansion medium made of water leaks from the temperature control element, and alcohol does not leak from the temperature control element.

  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 valve seat member 7 in which a lead-out passage 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, and an upper diaphragm member 13 that seals the first expansion medium 14 between the upper wall member 10 and A lower diaphragm member 15 that seals the second expansion medium 12 between the upper diaphragm member 13, and a lower wall member 16 that sandwiches and fixes the outer peripheral edges of the upper and lower diaphragm members 13, 15 between the upper wall member 10 and the upper diaphragm member 13. The lower diaphragm member 15 is fixed to the lead-out path 6 side and is formed from a valve member 17 that opens and closes the lead-out path 6 by being seated on and off the valve seat member 7. The first expansion medium 14 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, and the second expansion medium 12 is made of water. Become.

  The temperature control element 8 is accommodated in a bottomed cylindrical mounting member 18 fixed between the main body 1 and the valve seat member 7, one end is fixed to the lid member 5, and the other end is a temperature controller. The lower surface of the lower wall member 16 is held in contact with the step portion 20 of the mounting member 18 by the urging force of the coil spring 19 fixed to the element 8. 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 start-up, the inside of the valve chamber 4 is at a low temperature, the first expansion medium 14 and the second expansion medium 12 contract, and the valve member 17 and the upper and lower diaphragm members 13 and 15 are displaced upward by the fluid pressure on the inlet side. The member 17 is separated from the valve seat member 7 to open the outlet path 6. 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 first expansion medium 14 is first expanded, and the valve member 17 and the upper and lower diaphragm members 13 and 15 are moved downward against the fluid pressure on the inlet side. The valve member 17 approaches the valve seat member 7. When the temperature of the fluid flowing in from the inlet 2 further increases, the second expansion medium 12 expands and the valve member 17 and the upper and lower diaphragm members 13 and 15 are displaced downward against the fluid pressure on the inlet side. The member 17 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 second expansion medium 12 contracts first, the valve member 15 and the upper and lower diaphragm members 13 and 15 are displaced upward by the fluid pressure on the inlet side, and the valve member 17 is moved to the valve seat. Separate from the member 7. When the temperature in the valve chamber 4 further decreases, the first expansion medium 14 contracts, the valve member 17 and the upper and lower diaphragm members 13 and 15 are displaced upward by the fluid pressure on the inlet side, and the valve member 17 is moved to the valve seat member 7. Fully open.

  As described above, when the valve is closed, the first expansion medium 14 and the second expansion medium 12 are expanded in this order, and the upper and lower diaphragm members 13 and 15 are gradually displaced toward the valve seat member 7 to gradually lead out the valve member 17. The passage 6 is closed, and when the valve is opened, the second expansion medium 12 and the first expansion medium 14 are contracted in this order to gradually displace the upper and lower diaphragm members 13 and 15 stepwise in a direction away from the valve seat member 7. Since the valve member 17 opens the lead-out path 6, the opening / closing operation is stepwise and is not performed rapidly. Further, when the lower diaphragm member 15 is broken, the second expansion medium 12 made of water leaks from the temperature control element 8, and alcohol does not leak from the temperature control element 8.

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 Second expansion medium 13 Upper diaphragm member 14 First expansion medium 15 Lower diaphragm member 16 Lower wall member 17 Valve member 18 Mounting member

Claims (1)

The valve 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 the outer peripheral edge is fixed between the upper and lower wall members and the both wall members. Derivation of the upper and lower diaphragm members, the first expansion medium sealed between the upper wall member and the upper diaphragm member, the second expansion medium sealed between the upper diaphragm member and the lower diaphragm member, and the lower diaphragm member A temperature control element comprising a valve member disposed on the road side is disposed in the valve chamber, and the first expansion medium has an alcohol having a boiling point lower than water, a mixture of alcohols having a boiling point lower than water, or a boiling point higher than water. A thermally responsive steam trap comprising a mixture of low alcohol and water, wherein the second expansion medium comprises water.

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