JPH084990A - Thermally sensible steam trap - Google Patents

Abstract

PURPOSE:To provide a thermally sensible steam trap which can close a large passage by enlarging the manipulating force caused by expansion and contraction of an expandable medium. CONSTITUTION:An expandable medium is charged in an internal space defined between a wall member 13 and a diaphragm 14 which is formed from substantially semicircular pieces 14a, 14b by welding 18. The thickness of the diaphragm pieces 14a is smaller than that of the pieces 14 so that the piece 14a is more sensitive than the piece 14b. A valve element 16 having a flat valve surface 22 adapted to be seated on and lift off from a flat valve seat surface 9 which surrounds a pipe 8 is welded to the diaphragm 14 at a position 23. Thus obtained welded part 23 is positioned outside of the valve seat surface 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermo-responsive type that automatically discharges condensate generated in various steam-using devices and steam pipes by using a temperature control element containing an expansion medium that expands and contracts at a predetermined temperature. The present invention relates to a steam trap, and more particularly to a steam trap capable of opening and closing a large lead-out path with a small operating force.

[0002]

2. Description of the Related Art The basic structure of a heat-actuated steam trap is known, for example, from Japanese Patent Laid-Open No. 6-94189. As understood from the publication, a valve casing having an inlet, a valve chamber and an outlet is formed, and a lead-out passage communicating the valve chamber and the outlet is provided, and a flat valve seat surface is provided at one end surrounding the lead-out passage. The valve seat member includes a valve seat member and a temperature control element in which an expansion medium is enclosed in an inner space formed by fixing the outer peripheral edge of the diaphragm to the wall member and a valve member having a flat valve surface is fixed to the diaphragm. To the valve chamber, the valve seat member is fixed between the valve chamber and the outlet, and the temperature control element is arranged in the valve chamber with the valve surface facing the valve seat surface. The valve member is driven via the diaphragm, whereby the valve surface is seated on and seated on the valve seat surface to open and close the outlet passage.

When a high temperature fluid having a temperature higher than a predetermined temperature flows into the valve chamber, the expansion medium expands, the diaphragm is displaced in the valve closing direction, and the valve surface of the valve member is seated on the valve seat surface of the valve seat member. ,
Close the exit path. This prevents the discharge of steam. When a low temperature fluid below a predetermined temperature flows in, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, the valve surface separates from the valve seat surface, and the outlet passage is opened. by this,
Condensate and air are discharged outside the system.

[0004]

However, in the heat-actuated steam trap of this type, the valve member is perpendicular to the valve seat surface of the valve seat member, that is, the valve surface of the valve member is the valve seat surface. Since the valve is opened by displacing it parallel to the surface, there is a problem that the opening area of the lead-out path that can be opened and closed is small with respect to the operating force based on the expansion and contraction of the expansion medium.

Therefore, the technical problem of the present invention is to increase the operating force based on the expansion and contraction of the expansion medium to increase the opening area of the openable / closable lead-out path.
It is to provide a mutrap.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above-mentioned technical problems includes a valve casing having an inlet, a valve chamber and an outlet, and a valve chamber and an outlet communicating with each other. A valve seat member having a discharge passage and a flat valve seat surface at one end surrounding the discharge passage, and a flat valve surface in which an expansion medium is enclosed in an internal space formed by fixing the outer peripheral edge of the diaphragm to the wall member. A temperature control element having a valve member fixed to a diaphragm, the valve seat surface facing the valve chamber, the valve seat member fixed between the valve chamber and the outlet, and the valve surface facing the valve seat surface. In a thermally actuated steel trap in which a temperature control element is placed inside the valve chamber, a diaphragm is formed from two parts, the left and right parts, which have different responsiveness to pressure changes, and the diaphragm part and valve member of one side are sensitive to pressure changes. That the fixed part is formed outside the valve seat surface It is an butterfly.

The diaphragm can be made to have different responsiveness to a pressure change by processing one side thinly or by forming diaphragm pieces having different thicknesses. Further, the responsiveness to the pressure change can be made different by forming ripples on one side or by making the shapes of ripples formed on both sides different. Further, the responsiveness to the pressure change can be made different by joining and forming the diaphragm pieces made of materials having different elastic forces.

[0008]

The operation of the above technical means is as follows.
Since the diaphragm is made up of two parts, the left and right parts, which have different responsiveness to the pressure change, when the high temperature fluid above the predetermined temperature flows into the valve chamber and the expansion medium expands, the diaphragm sensitive to the pressure change on one side first. The portion is displaced in the valve closing direction, and the valve surface of the valve member is inclined to the valve seat surface of the valve seat member. Subsequently, the diaphragm portion, which is insensitive to the pressure change, is displaced in the valve closing direction, the valve surface is placed in a posture parallel to the valve seat surface, and the valve seat surface is brought into close contact with the valve seat surface to close the outlet passage.

When a low temperature fluid having a temperature lower than a predetermined temperature flows into the valve chamber and the expansion medium contracts, first, the diaphragm portion sensitive to the pressure change on one side is displaced in the valve opening direction. At this time, the fixed portion between the diaphragm portion and the valve member, which is sensitive to pressure change, is set as the force point in the valve opening direction, and the valve member is swung with the portion of the valve seat surface on the opposite side across the lead-out path as the fulcrum from this force point. , Tilt the valve surface from the valve seat surface and separate it. The diaphragm part that is sensitive to pressure change on one side and the part where the valve member is fixed are located outside the valve seat surface, so the distance between the force point and the fulcrum is larger than the seal diameter of the valve seat surface, and the operation in the valve opening direction The force can be expanded by the principle of leverage, and a large lead-out path can be opened. Subsequently, the diaphragm portion, which is insensitive to the pressure change, is displaced in the valve opening direction, and the valve surface is placed in a posture parallel to the valve seat surface to fully open the outlet passage.

[0010]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). Upper casing 1 and lower casing 2
And are screwed together to form a valve casing having the valve chamber 3 therein. An inlet 4 is formed in the upper casing 1 and an outlet 5 is formed in the lower casing 2. A valve seat member 7 is screwed to a partition wall 6 between the valve chamber 3 and the outlet 5. At the center of the valve seat member 7, a penetrating passage 8 that connects the valve chamber 3 and the outlet 5 is formed. A flat valve seat surface 9 is formed at the end of the outlet passage 8 on the valve chamber 3 side so as to surround the outlet passage 8.

A temperature control element 10 is housed in a bottomed cylindrical mounting member 11 having an inner bottom surface sandwiched between the partition wall 6 and the valve seat member 7 so as to be located above the valve seat member 7. Has been done. A plurality of condensate passage windows 1 are provided on the peripheral wall of the mounting member 11.
2 is open. The temperature control element 10 has a wall member 13
, Diaphragm 14, expansion medium 15, and valve member 16
And a lower wall member 17.

The diaphragm 14 is formed by welding two substantially semicircular left and right diaphragm pieces 14a and 14b by welding (at the position of reference numeral 18), and the diaphragm piece 14a is formed thinner than the diaphragm piece 14b. There is. Further, the diaphragm 14 is formed with concentric ripples. The outer peripheral edge of the diaphragm 14 is the wall member 13.
It is sandwiched by the outer peripheral edge of the lower wall member 17 and fixed by welding (at the position of reference numeral 19).

The expansion medium 15 is injected into the internal space formed by the wall member 13 and the diaphragm 14 from the injection port 20 of the wall member 13, and the injection port 20 is sealed by closing it with a plug member 21. The expansion medium 15 is water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The valve member 16 has a flat valve surface 22 facing and seating against the valve seat surface 9 of the valve seat member 7, and the diaphragm 1
4 is welded to the side opposite to the side in which the expansion medium 15 is enclosed (reference numeral 2
3 points). This welded part 23
Is located outside the valve seat surface 9 of the valve seat member 7.

A conical coil spring 25 is arranged between the screen 24 sandwiched between the upper casing 1 and the mounting member 11 and the wall member 13 of the temperature control element 10 to attach the temperature control element 10. The lower surface of the outer peripheral surface of the lower wall member 17 is urged and held by the step portion 26 formed on the inner surface of the mounting member 11.

At the time of start-up, the temperature inside the valve chamber 3 is low, the expansion medium 15 contracts, the valve member 16 is separated from the valve seat member 7 and the outlet passage 8 is opened, and the low temperature fluid is discharged. When a high temperature fluid having a temperature equal to or higher than a predetermined temperature flows into the valve chamber 3 due to the discharge of the low temperature fluid, the expansion medium 15 expands, and the thinly formed diaphragm piece 14a sensitive to the pressure change is displaced in the valve closing direction. , The valve surface 22 of the valve member 16 to the valve seat surface 9 of the valve seat member 7.
Take a tilted position with respect to. Subsequently, the thickly formed diaphragm piece 14b, which is insensitive to the pressure change, is displaced in the valve closing direction, and the valve surface 22 is brought into a posture parallel to the valve seat surface 9 so as to be in close contact with the valve seat surface 9 and the outlet passage 8 is closed. To prevent the outflow of steam.

When the temperature in the valve chamber 3 drops due to heat radiation or a low temperature fluid below a predetermined temperature flows in, the expansion medium 15 contracts and the diaphragm piece 14a is first displaced in the valve opening direction. At this time, the diaphragm piece 14a and the valve member 16
The welding portion 23 is used as a force point in the valve opening direction, and the valve member 16 is swung with the portion of the valve seat surface 9 on the opposite side sandwiching the lead-out path as a fulcrum from this power point, and the valve surface 22 is tilted from the valve seat surface 9. Move away. The one shown in the figure shows this state. Since the distance between the force point and the fulcrum is larger than the seal diameter of the valve seat surface 9, the large lead-out path 8 can be opened. Subsequently, the diaphragm piece 14b is displaced in the valve opening direction, the valve surface 22 is placed in a posture parallel to the valve seat surface 9, and the outlet passage 8 is fully opened to discharge the low temperature fluid.

In the above-mentioned embodiment, the diaphragm is formed by joining two right and left diaphragm pieces having different thicknesses. However, even if one side of the diaphragm is thinly processed, the responsiveness to the pressure change may be different. Good.
Further, the response to the pressure change may be made different by forming ripples on one side or by making the shapes of ripples formed on both sides different. Also, by joining diaphragm pieces formed of materials having different elastic forces, for example, one side diaphragm piece is made of stainless steel or nickel-molybdenum alloy represented by Hastelloy (trademark) and the other side diaphragm piece is joined. The responsiveness to the pressure change may be made different by forming it from phosphor bronze or the like, or by using the same stainless steel but changing the carbon content or using different chemical components.

[0019]

The present invention produces the following unique effects. As described above, the heat-actuated steam trap according to the present invention is
The diaphragm is formed from two parts, the left and right parts, which have different responsiveness to the pressure change, and the diaphragm part sensitive to the pressure change on one side and the fixing part of the valve member are formed outside the valve seat surface, thereby expanding the expansion medium. The discharge force can be increased because the operation force based on the contraction can be expanded to open and close the large lead-out path.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat-actuated steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 3 valve chamber 4 inlet 5 outlet 7 valve seat member 8 outlet path 9 valve seat surface 10 temperature control element 13 wall member 14 diaphragm 15 expansion medium 16 valve member 22 valve surface

Claims (1)

[Claims] 1. A valve casing having an inlet, a valve chamber and an outlet, and a valve seat member having a lead-out passage communicating the valve chamber and the outlet and surrounding the lead-out passage and having a flat valve seat surface at one end. A temperature control element having a valve member having a flat valve surface fixed to the diaphragm by enclosing an expansion medium in an internal space formed by fixing the outer peripheral edge of the diaphragm to the wall member, and the valve seat surface to the valve chamber. The valve seat member is fixed between the valve chamber and the outlet, and the temperature control element is arranged in the valve chamber with the valve surface facing the valve seat surface. A thermally responsive steam trap, characterized in that a diaphragm is formed from a part and a part of the diaphragm that is sensitive to pressure change on one side and a fixed part of the valve member are formed outside the valve seat surface.