JP3341192B2 - 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 thermoresponsive steel trap in which a temperature control element is disposed in a valve chamber, expansion media having different expansion and contraction temperatures are filled in two left and right inner spaces formed by a wall member and two left and right diaphragms, and expansion is performed at a high temperature. Of the diaphragm and valve member on the contracting expansion medium side Than the valve seat surface Chakubui is characterized in that it has formed on the outer side.

[0007] The expansion medium enclosed in one internal space is:
Water, a liquid having a lower boiling point than water, or a mixture thereof, and the expansion medium sealed in the other internal space forms a liquid having a lower boiling point or a lower boiling point than the expansion medium sealed in one internal space. Mixture.

[0008]

The operation of the above technical means is as follows.
Since the expansion media having different expansion and contraction temperatures are sealed in the left and right inner spaces formed by the wall member and the two left and right diaphragms, first, when a high temperature fluid having a predetermined temperature or more flows into the valve chamber, the expansion is performed at a low temperature. The contracting expansion medium expands, and the diaphragm on the expansion medium side that expands and contracts at a low temperature is displaced in the valve closing direction, so that the valve surface of the valve member is inclined with respect to the valve seat surface of the valve seat member. Subsequently, the expansion medium that expands and contracts at high temperature expands, the diaphragm on the expansion medium side that expands and contracts at high temperature is displaced in the valve closing direction, the valve surface is brought into a position parallel to the valve seat surface, and the valve surface is brought into close contact with the valve seat surface, Close the lead-out path.

When a low-temperature fluid having a temperature lower than a predetermined temperature flows into the valve chamber, an expansion medium which expands and contracts at a high temperature first contracts.
The diaphragm on the side of the expansion medium that expands and contracts at high temperature is displaced in the valve opening direction. At this time, the fixed portion between the diaphragm and the valve member on the side of the expansion medium that expands and contracts at high temperature is defined as the point of force in the valve opening direction, and the valve member is swung from this point of force on the portion of the valve seat surface on the opposite side across the lead-out path. Then, the valve surface is tilted away from the valve seat surface to be separated. Since the fixed portion of the diaphragm on the expansion medium side that expands and contracts at high temperature and the valve member 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 valve is opened. The operating force in the direction can be expanded by the principle of leverage, and a large outlet path can be opened. Subsequently, the expansion medium that expands and contracts at a low temperature contracts, and the diaphragm on the side of the expansion medium that expands and contracts at a low temperature is displaced in the valve opening direction, and the outlet surface is fully opened with the valve surface in a position parallel to the valve seat surface.

[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 is a liquid having a boiling point several degrees lower than that of water.
Is a liquid having a boiling point several degrees lower than that of the expansion medium 16.

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 by discharging the low-temperature fluid, the expansion medium 17 having a low boiling point expands first, the diaphragm 15 is displaced in the valve closing direction, and the valve member 1 is displaced.
The valve surface 26 of FIG. 8 is inclined with respect to the valve seat surface 9 of the valve seat member 7. Subsequently, the high-boiling expansion medium 16 expands,
The diaphragm 14 is displaced in the valve closing direction, the valve surface 26 is brought into a posture parallel to the valve seat surface 9, and is brought into close contact with the valve seat surface 9.
To prevent vapor outflow.

When the temperature in the valve chamber 3 decreases due to heat radiation or the like and a low-temperature fluid having a temperature lower than a predetermined temperature flows therein, the expansion medium 16 first contracts, and the diaphragm 14 is 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. Then the expansion medium 17
Is contracted, the diaphragm 15 is displaced in the valve opening direction, the valve surface 26 is set in a posture parallel to the valve seat surface 9, and the outlet path 8 is fully opened.
Drain the cryogenic fluid.

[0018]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
An expansion medium having a different expansion and contraction temperature is sealed in the left and right inner spaces formed by the wall member and the two left and right diaphragms, and a portion where the diaphragm and the valve member on the expansion medium side that expands and contracts at a high temperature is fixed to a position closer to the valve seat surface. By forming it on the outside, the operating force based on the expansion and contraction of the expansion medium can be expanded and a large outlet path can be opened and closed, so that 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 disposed in the valve chamber with the valve surface facing the valve seat surface, and is formed by a wall member and two left and right diaphragms. A heat exchanger characterized in that expansion media having different expansion and contraction temperatures are sealed in two internal spaces on the right and left sides, and a portion where the diaphragm and the valve member on the expansion medium side that expands and contracts at a high temperature is fixed outside the valve seat surface. Responsive steam trap.