JP3341191B2 - Thermo-responsive steam trap - Google Patents

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 for automatically discharging condensate generated in various steam-using equipment and steam pipes by using a temperature control element including an expansion medium which 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 outlet path with a small operation force.

[0002]

2. Description of the Related Art The basic structure of a thermally responsive steam trap is known, for example, from JP-A-6-94189. As understood from the publication, a valve casing forming an inlet, a valve chamber, and an outlet, and a lead-out path communicating the valve chamber with the outlet, and having a flat valve seat surface at one end surrounding the lead-out path. A valve seat member, and a temperature control element in which an expansion medium is sealed in an inner space formed by fixing an outer peripheral edge of the diaphragm to a wall member, and a valve member having a flat valve surface is fixed to the diaphragm; With the valve seat member fixed between the valve chamber and the outlet with the temperature control element arranged in the valve chamber with the valve face facing the valve seat face. The valve member is driven via the diaphragm, whereby the valve surface is separated from and seated on the valve seat surface to open and close the outlet passage.

When a high-temperature fluid having a predetermined temperature or more 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 lead-out path. This prevents the discharge of steam. When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, the valve surface is separated from the valve seat surface, and the outlet path is opened. by this,
Condensate and discharge air out of the system.

[0004]

However, in such a thermoresponsive 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 set to the valve seat. Due to the structure in which the valve is opened while being displaced in parallel with the surface, there is a problem that the opening area of the openable / closable outlet path is small with respect to the operating force based on the expansion and contraction of the expansion medium.

Accordingly, a technical problem of the present invention is to increase the operating force based on the expansion and contraction of the expansion medium, thereby increasing the opening area of the openable / closable outlet path.
Is to provide a mechanical trap.

[0006]

Means for Solving the Problems The technical means of the present invention which has been taken to solve the above technical problem is that a valve casing which forms an inlet, a valve chamber and an outlet communicates with the valve chamber and the outlet. A valve seat member surrounding the outlet passage and having a flat valve seat surface at one end, and a flat valve surface enclosing an expansion medium in an inner space formed by fixing an outer peripheral edge of the diaphragm to a wall member. A temperature control element having a valve member fixed to the diaphragm, the valve seat surface facing the valve chamber, the valve seat member being fixed between the valve chamber and the outlet, and the valve surface facing the valve seat surface. In a thermally responsive steel trap in which a temperature control element is disposed in a valve chamber, two left and right internal spaces for enclosing an expansion medium are formed by a wall member and two left and right diaphragms having different responsiveness to pressure change, and the pressure is controlled. Change-sensitive diaphragm and valve member fixation site It is characterized in that it has formed outside the valve seat surface.

[0007] By using the two diaphragms having different thicknesses, the response to a pressure change can be made different. The response to a pressure change can also be made different by forming a ripple on one side or by making the shape of the ripple formed on both sides different. Also, by using a diaphragm formed of materials having different elastic forces, the response to a pressure change can be made different.

[0008]

The operation of the above technical means is as follows.
Since the left and right inner spaces for enclosing the expansion medium are formed by the left and right two diaphragms having different responsiveness to the pressure change with the wall member, when a high temperature fluid having a predetermined temperature or more flows into the valve chamber and the expansion medium expands. First, the diaphragm sensitive to one pressure change is displaced in the valve closing direction, and the valve surface of the valve member is inclined with respect to the valve seat surface of the valve seat member. Subsequently, the diaphragm which is insensitive to the other pressure change is displaced in the valve closing direction, the valve surface is brought into a posture parallel to the valve seat surface, and is brought into close contact with the valve seat surface, thereby closing the lead-out passage.

When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows into the valve chamber and the expansion medium contracts, a diaphragm which is sensitive to one pressure change is first displaced in the valve opening direction. At this time, the fixed portion of the diaphragm and the valve member that is sensitive to the pressure change is set as the point of force in the valve opening direction, and the valve member is rocked from this point of force on the portion of the valve seat surface on the opposite side across the lead-out path, Tilt the valve surface away from the valve seat surface and separate it. Since the fixed part of the diaphragm and valve member sensitive to pressure change is formed outside the valve seat surface, the distance between the force point and the fulcrum is larger than the seal diameter of the valve seat surface, and the operating force in the valve opening direction Can be enlarged by the principle of leverage, and a large lead-out path can be opened. Subsequently, the diaphragm part insensitive to the other pressure change is displaced in the valve opening direction,
With the valve face parallel to the valve seat face, the outlet path is fully opened.

[0010]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). Upper case 1 and lower case 2
Are screwed together to form a valve casing having a valve chamber 3 therein. The upper case 1 has an inlet 4 and the lower case 2 has an outlet 5. A valve seat member 7 is screwed to a partition 6 between the valve chamber 3 and the outlet 5. In the center of the valve seat member 7, a through-out passage 8 communicating 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.

The temperature control element 10 is housed in a bottomed cylindrical mounting member 11 having a bottom inner periphery sandwiched between the partition wall 6 and the valve seat member 7 so as to be located above the valve seat member 7. Have been. 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 includes a wall member 13.
And diaphragms 14 and 15 and expansion media 16 and 17
, A valve member 18 and a lower wall member 19.

Each of the diaphragms 14 and 15 has a substantially semicircular shape with its outer peripheral edge bent upward.
4 is formed thinner than the diaphragm 15. Further, ripples are formed on the diaphragms 14 and 15. The outer peripheral edges of the diaphragms 14 and 15 are fixed to the wall member 13 by welding (at locations 20 and 21).

The expansion medium 1 is inserted into the internal space defined by the wall member 13 and the diaphragm 14 from the inlet 22 of the wall member 13.
6 is injected, and the injection port 22 is sealed by closing the injection port 22 with a plug member 23. Similarly, an expansion medium 17 is injected into an internal space formed by the wall member 13 and the diaphragm 15 from an injection port 24 of the wall member 13, and the injection port 24 is sealed by closing the injection port 24 with a plug member 25. The expansion medium 16, 17 is water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The valve member 18 has a flat valve surface 26 which faces and separates from the valve seat surface 9 of the valve seat member 7.
4 and 15 are fixed by welding (at reference numerals 27 and 28) to the side opposite to the side where the expansion media 16 and 17 are sealed. These welding portions 27 and 28 are located outside the valve seat surface 9 of the valve seat member 7.

A conical coil spring 30 is arranged between the screen 29 sandwiched between the upper casing 1 and the mounting member 11 and the wall member 13 of the temperature control element 10, and the temperature control element 10 is attached. The lower surface of the lower wall member 19 is urged to be held by a step 31 formed on the inner surface of the mounting member 11.

At the time of starting, the inside of the valve chamber 3 is at a low temperature, the expansion media 16 and 17 are contracted, the valve member 18 is separated from the valve seat member 7 and the outlet passage 8 is opened, and the low temperature fluid is discharged. I do. When a high-temperature fluid having a predetermined temperature or more flows into the valve chamber 3 due to the discharge of the low-temperature fluid, the expansion media 16 and 17 expand, and the thinly formed diaphragm 14 sensitive to pressure change is displaced in the valve closing direction. Then, the valve surface 26 of the valve member 18 is inclined with respect to the valve seat surface 9 of the valve seat member 7. Subsequently, the thick diaphragm 15 insensitive to pressure changes is displaced in the valve closing direction, and the valve surface 26 is set in a posture parallel to the valve seat surface 9.
, And closes the outlet passage 8 to prevent the outflow of steam.

When the temperature in the valve chamber 3 drops due to heat radiation or the like and a low-temperature fluid having a temperature lower than a predetermined temperature flows in, the expansion media 16 and 17 contract, and the diaphragm 14 is first displaced in the valve opening direction. At this time, the welded portion 27 between the diaphragm 14 and the valve member 18 is set as a point of force in the valve opening direction, and the valve member 18 is rocked from this point of force with the portion of the valve seat surface 9 on the opposite side across the lead-out path as a fulcrum. 26 is tilted away from the valve seat surface 9 and separated. The illustrated one 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, a large outlet path 8 can be opened. Subsequently, the diaphragm 15 is displaced in the valve opening direction, and the valve surface 26 is moved to the valve seat surface 9.
And the outlet path 8 is fully opened to discharge the low-temperature fluid.

In the above embodiment, an example using diaphragms having different thicknesses has been described. However, by forming ripples on one of the diaphragms or making the shapes of the ripples formed on both sides different, the response to a pressure change can be improved. It may be different. Also, by using diaphragms formed of materials having different elastic forces, for example, one diaphragm is formed of stainless steel or a nickel-molybdenum-based alloy represented by Hastelloy (trade name), and the other diaphragm is formed of phosphor bronze or the like. The response to the pressure change may be varied by changing the carbon content or using different chemical components even if the same stainless steel is used.

[0019]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
The left and right two diaphragms, which have different responsiveness to pressure changes, form two inner spaces on the left and right sides for enclosing the expansion medium, and the pressure sensitive diaphragm and the valve member are fixed to the outside of the valve seat surface. By forming, the operating force based on the expansion and contraction of the expansion medium is expanded,
Since a large outlet path can be opened and closed, the discharge capacity can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermally responsive steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Valve room 4 Inlet 5 Outlet 7 Valve seat member 8 Outlet 9 Valve seat surface 10 Temperature control element 13 Wall member 14, 15 Diaphragm 16, 17 Expansion medium 18 Valve member 26 Valve surface

Claims (1)

(57) [Claims] A valve casing having an inlet, a valve chamber, and an outlet; a valve seat member having a lead-out path communicating the valve chamber with the outlet, surrounding the lead-out path, and having a flat valve seat surface at one end; A temperature control element in which an expansion medium is sealed 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, and the valve seat surface is provided in 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 face facing the valve seat face. A thermally responsive type wherein two left and right diaphragms form two left and right internal spaces for enclosing an expansion medium, and a fixed portion between the diaphragm and the valve member, which are sensitive to pressure changes, is formed outside the valve seat surface. Steam trap.