JP2835674B2 - 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 steam trap for automatically discharging condensate generated in various steam-using equipment and steam pipes, and more particularly, to a steam trap which is heated and cooled by steam and condensate and expanded according to the temperature. The present invention relates to a thermo-responsive steam trap for discharging condensate below a desired temperature out of the system by using a temperature control element containing a contracting medium.

[0002]

2. Description of the Related Art The basic structure of a thermally responsive steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, the outer peripheral edge of the diaphragm is fixed between the upper and lower two dish-shaped wall members, the expansion medium is sealed in the internal space between the upper wall member and the diaphragm, and the valve member is connected to the diaphragm. The temperature control element is disposed in the valve chamber communicating with the inlet, and the valve member is driven through the diaphragm by utilizing the expansion and contraction of the expansion medium, thereby connecting the outlet with the valve chamber. The valve member is adapted to be detached and seated on the valve seat member having the above.

[0003] When high-temperature steam flows into the valve chamber, the expansion medium expands, and the valve member is seated on the valve seat member, and the outlet path is closed. This prevents the discharge of steam. Also, when low-temperature condensate flows in, the expansion medium contracts, causing the valve member to move away from the valve seat member and open the outlet path. As a result, the condensate is discharged out of the system.

[0004]

However, in such a thermo-responsive steam trap of this type, the on-off valve operation is repeated little by little after the expansion and contraction temperature of the expansion medium, so that the condensate cannot be recovered. And it is not desirable because it may be mistaken for a steam leak. Further, there is a problem that the valve member and the valve seat member are worn out early, causing steam leakage.

[0005] Accordingly, it is an object of the present invention to provide a heat-responsive steam trap that performs an intermittent on-off valve operation.

[0006]

In order to solve the above-mentioned technical problems, the technical means of the present invention is to provide a valve seat having an inlet, a valve chamber, and an outlet formed by valve casing and having an outlet path. A member disposed between the valve chamber and the outlet, two upper and lower wall members, a diaphragm having an outer peripheral edge fixed between the two wall members, an expansion medium sealed between the upper wall member and the diaphragm, a diaphragm; A temperature control element comprising a valve member connected to the valve member is disposed in the valve chamber, and the valve member is detached and seated on the valve seat member by displacement of the diaphragm due to expansion and contraction of the expansion medium to open and close the outlet path. A heat insulating layer having low thermal conductivity is formed around the element.

[0007]

The operation of the above technical means is as follows.
Since the heat is difficult to be transmitted by the heat insulation layer with low thermal conductivity formed around the temperature control element, when the expansion medium contracts due to low temperature condensate in the valve chamber and shifts from closing to opening, the temperature in the valve chamber becomes lower. Then open the valve. Conversely, when the expansion medium expands and moves from valve opening to valve closing, the valve chamber is closed after the temperature in the valve chamber becomes higher. In this way, it is possible to lengthen the time required to shift from valve closing to valve opening and from valve opening to valve closing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). In FIG. 1, an upper case 1 and a lower case 2 are screwed together to form a valve chamber 3 therein.
Is formed. 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 that connects the valve chamber 3 and the outlet 5 is formed.

A temperature control element 9 is located above the valve seat member 7. The temperature control element 9 includes an upper wall member 11 having an inlet 10, a plug member 12 for sealing the inlet 10, a first diaphragm 14 forming a housing chamber 13 between the upper wall member 11, An expansion medium 15 sealed in the chamber 13, a valve member 16 which is detachably seated on the valve seat member 7 to open and close the outlet passage 8, a second diaphragm 18 for fixing the valve member 16 together with the annular member 17, a first and a second diaphragm 18. Lower wall member 19 which fixes the outer peripheral edges of the two diaphragms 14 and 18 between the upper wall member 11
A stopper 20 fixed to the upper wall member 11 and an upper wall member 22 having an outer peripheral edge fixed to the outer peripheral edge of the upper wall member 11 and forming an air layer 21 as a heat insulating layer between the stopper 20 and the upper wall member. Consists of The expansion medium 15 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The temperature control element 9 is accommodated in a bottomed cylindrical mounting member 23 fixed between the partition wall 6 and the valve seat member 7 and fixed by a snap ring 24. At the lower end of the mounting member 23, two condensate passage windows 25 are opened on both sides.

When the temperature of the fluid flowing into the valve chamber 3 from the inlet 4 is high, the expansion medium 15 expands. And the first and second diaphragms 14,
18, the valve member 16 is displaced downward, and as a result, the valve member 16 is seated on the valve seat member 7, and the outlet path 8
To prevent outflow of hot fluid or vapor. Valve room 3
When the fluid temperature inside becomes lower than the predetermined value due to heat radiation etc.
The expansion medium 15 contracts, but also in this case, contracts after the temperature of the fluid becomes lower, so that the valve member 16 separates from the valve seat member 7 and opens the outlet passage 8. Cryogenic fluid, ie, condensate, flows out of outlet 8 to outlet 5.

In the above embodiment, the air layer is formed as the heat insulating layer. However, the heat insulating layer may be formed by attaching a heat insulating member such as rubber or resin to the upper wall member or the lower wall member. .

[0013]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
Since intermittent on-off valve operation can be performed, there is no mistake for steam leakage at the time of condensate discharge, and wear of the valve member and valve seat member is less likely to occur. It can be carried out.

[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.

FIG. 2 is an enlarged sectional view of the temperature control element of FIG.

[Explanation of symbols]

 Reference Signs List 3 valve chamber 4 inlet 5 outlet 7 valve seat member 8 outlet path 9 temperature control element 11 upper wall member 14 first diaphragm 15 expansion medium 16 valve member 18 second diaphragm 19 lower wall member 21 air layer (heat insulating layer) 22 outer wall Element

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by valve casing, a valve seat member having an outlet path is disposed between the valve chamber and the outlet, and two upper and lower wall members and two wall members are provided. A temperature control element including a diaphragm having an outer peripheral edge fixed therebetween, an expansion medium sealed between the upper wall member and the diaphragm, and a valve member connected to the diaphragm is disposed in the valve chamber, and the expansion and contraction of the expansion medium is performed. In which the valve member is separated from and seated on the valve seat member by the displacement of the diaphragm due to the opening and closing of the outlet path,
A thermally responsive steam trap comprising a heat insulating layer having a low thermal conductivity formed around a temperature control element.