JP4294414B2 - 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, a diaphragm member having an outer peripheral edge fixed between both wall members, and an alcohol having a lower boiling point than water or a mixture of alcohols having a lower boiling point than water sealed between the upper wall member and the diaphragm member, or A temperature control element comprising a first expansion medium composed of a mixture of alcohol having a boiling point lower than water and water and a valve member disposed on the outlet path side of the diaphragm member is disposed in the valve chamber, and expansion of the first expansion medium The valve member is driven by the displacement of the diaphragm member due to the contraction to open and close the lead-out path. The expansion medium consists 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.

When a high-temperature fluid having a predetermined temperature or more flows into the valve chamber, the first expansion medium expands and displaces the diaphragm member toward the valve seat member against the fluid pressure on the inlet side. As a result, the valve member closes the outlet passage to prevent the steam from being discharged. When a low-temperature fluid having a predetermined temperature or less flows in, the first expansion medium contracts, and the diaphragm member is displaced in the valve opening direction by the fluid pressure on the inlet side. As a result, the valve member opens the outlet passage and discharges condensate and air out of the system. However, in the above prior art, the valve member suddenly opens and closes the outlet passage due to the displacement of the diaphragm member due to the expansion and contraction of the first expansion medium, so that a rapid flow of fluid occurs on the inlet side or the outlet side and the water hammer There was a problem that caused. In addition, when the diaphragm member is damaged, the first expansion medium leaks from the temperature control element, and therefore, there is a problem that leads to a serious accident when used in the field of food and medicine.
Japanese Patent No. 3355388

  The problem to be solved is to provide a thermally responsive steam trap that does not suddenly open and close and prevents the first expansion medium from leaking out of the temperature control element even if the diaphragm member is damaged.

  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. A diaphragm member having a fixed periphery, an alcohol having a lower boiling point than water sealed between the upper wall member and the diaphragm member, 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 A temperature control element comprising a first expansion medium comprising a valve member disposed on the outlet path side of the diaphragm member is disposed in the valve chamber, and the valve member is driven by displacement of the diaphragm member due to expansion and contraction of the first expansion medium. In the thermally responsive steam trap that opens and closes the lead-out path, the outer peripheral wall of the valve member is hermetically slid to the inner peripheral wall of the lower wall member, and the second expansion made of water between the diaphragm member and the valve member Wherein the sealed body.

  The present invention does not cause a water hammer because it does not open and close the lead-out path abruptly, and an excellent effect that the expansion medium does not leak from the temperature control element even if the diaphragm member is damaged. Produce.

  The thermally responsive steam trap of the present invention includes an alcohol having a lower boiling point than water, a mixture of alcohol having a lower boiling point than water, or a mixture of alcohol having a lower boiling point than water and water between the upper wall member and the diaphragm member. A first expansion medium comprising: a sealing member, and an outer peripheral wall of the valve member being hermetically slid on an inner peripheral wall of the lower wall member to seal a second expansion medium made of water between the diaphragm member and the valve member. It is. 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. Thus, the opening / closing operation is stepwise and is not performed rapidly. Further, when the diaphragm member is broken, the space in which the first expansion medium and the second expansion medium are sealed communicates, and the first expansion medium 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). The main body 1 is formed with an inlet 2 and an outlet 3 on the same axis, 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, a diaphragm member 13 that seals the first expansion medium 14 between the upper wall member 10, and A lower wall member 16 that is fixed with the outer peripheral edge of the diaphragm member 13 sandwiched between the upper wall member 10 and an outer peripheral wall that is disposed on the lead-out path 6 side of the diaphragm member 13 airtightly connects the inner peripheral wall of the lower wall member 16. The second expansion medium 12 is sealed between the diaphragm member 13 and the valve member 15 which opens and closes the outlet passage 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, 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 The outlet passage 6 is opened away from the valve seat member 7. 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 first expands, and the valve member 15 and the diaphragm member 13 are displaced downward against the fluid pressure on the inlet side. The valve member 15 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, the valve member 15 and the diaphragm member 13 are displaced downward against the fluid pressure on the inlet side, and the valve member 15 The lead-out path 6 is closed by sitting on the valve seat member 7. This prevents steam leakage. When the temperature in the valve chamber 4 decreases due to heat radiation, the second expansion medium 12 contracts first, and the valve member 15 and the diaphragm member 13 are displaced upward by the fluid pressure on the inlet side, so that the valve member 15 is disengaged from the valve seat member 7. Take a seat. When the temperature in the valve chamber 4 further decreases, the first expansion medium 14 contracts, 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 fully opens the valve seat member 7. .

  Thus, when the valve is closed, the first expansion medium 14 and the second expansion medium 12 are expanded in this order to gradually displace the diaphragm member 13 toward the valve seat member 7, so that the valve member 15 moves the lead-out path 6. 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 diaphragm member 13 in a direction away from the valve seat member 7, so that the valve member 15 is led out. Since 6 is opened, the opening / closing operation is stepwise and is not performed rapidly. Further, when the diaphragm member 13 is damaged, the space in which the first expansion medium 14 and the second expansion medium 12 are sealed communicates, and the first expansion medium 14 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 Diaphragm member 14 First expansion medium 15 Valve member 16 Lower wall member 18 Attachment Element

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. A first member comprising a diaphragm member, an alcohol having a lower boiling point than water sealed between the upper wall member and the diaphragm member, 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. A temperature control element comprising an expansion medium and a valve member disposed on the outlet path side of the diaphragm member is disposed in the valve chamber, and the valve member is driven by the displacement of the diaphragm member due to the expansion and contraction of the first expansion medium to set the outlet path. What opens and closes is characterized by sealing the second expansion medium made of water between the diaphragm member and the valve member by airtightly sliding the outer peripheral wall of the valve member on the inner peripheral wall of the lower wall member. Response-type steam trap.

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