JP2835686B2 - 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 devices and steam pipes, and more particularly to a heat trap which is heated and cooled by steam and condensate and expands and contracts in accordance with the temperature. Using a temperature control element containing a
The present invention relates to a thermo-responsive steam trap that discharges condensate having a predetermined temperature or less to the outside of the system.

[0002]

2. Description of the Related Art The present applicant has previously proposed a thermally responsive steam trap as Japanese Patent Application No. 3-76781. In this method, the outer peripheral edges of the first and second diaphragms are fixed between the upper and lower two dish-shaped wall members, the expansion medium is sealed in a storage chamber between the upper wall member and the first diaphragm, and the second diaphragm is fixed to the second diaphragm. A temperature control element having a valve member connected thereto and a through hole formed in the second diaphragm and the valve member is disposed in a valve chamber communicating with the inlet, and the first and second diaphragms are formed by utilizing expansion and contraction of an expansion medium. The valve member is driven via the valve member, thereby allowing the valve member to be separated from and seated on a valve seat member having an outlet passage communicating the valve chamber and the outlet.

When a high-temperature fluid having a temperature equal to or higher than a predetermined temperature flows into the valve chamber, the expansion medium expands, displacing the first and second diaphragms in the valve closing direction, seating the valve member on the valve seat member, and discharging the valve member. Close the road. This prevents the discharge of steam. When a low-temperature fluid below a predetermined temperature flows in,
The expansion medium contracts, the first and second diaphragms are displaced in the valve opening direction by the fluid pressure on the inlet side, the valve member is separated from the valve seat member, and the outlet path is opened. by this,
Condensate and discharge air out of the system.

[0004]

However, such a thermo-responsive steam trap of this type has a problem that the outlet path cannot be opened when the fluid pressure on the inlet side is very low. That is, when the temperature in the valve chamber is low, the expansion medium contracts, the pressure in the chamber containing the expansion medium becomes negative, and the first diaphragm is displaced in the valve closing direction. However, the second diaphragm cannot be displaced in the valve opening direction because the fluid pressure on the inlet side is a slight pressure, and therefore the valve member cannot be separated from the valve seat member.

Accordingly, a technical object of the present invention is to make it possible to open the outlet passage even when the fluid pressure on the inlet side is very small.

[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 is disposed between the valve chamber and the outlet, two upper and lower wall members, first and second diaphragms having outer peripheral edges fixed between the two wall members, and between the upper wall member and the first diaphragm. A temperature control element comprising the enclosed expansion medium and a valve member connected to the second diaphragm is disposed in the valve chamber, and a through-hole communicating the surface of the first diaphragm that is not in contact with the expansion medium and the lead-out path is formed. A second diaphragm formed on a diaphragm and a valve member, wherein the valve member is detached and seated on a valve seat member by displacement of the first and second diaphragms due to expansion and contraction of an expansion medium to open and close an outlet path. Formed in the second
It is characterized in that the diaphragm is deformed so as to separate the valve member from the valve seat member at a low temperature.

[0007]

The operation of the above technical means is as follows.
Even when the fluid pressure on the inlet side is slight pressure, when the valve chamber temperature is low, the second diaphragm formed by the temperature responsive member is deformed and the valve member is separated from the valve seat member, so that the outlet path must be opened. Becomes possible.

[0008]

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

A temperature control element 9 is arranged 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
And a stopper 20 fixed to the upper wall member 11. The valve member 16, the annular member 17, and the second diaphragm 18 are formed with through holes 21 that communicate the lower surface of the first diaphragm 14 and the lead-out path 8. The expansion medium 15 is
It is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. The second diaphragm 18 is formed of a bimetal as a temperature responsive member. When the temperature in the valve chamber is lower than a predetermined temperature, the second diaphragm 18 is deformed upward and convex as shown in FIG. 1 to separate the valve member 16 from the valve seat member 7. Fig. 2
It becomes almost flat like.

The temperature control element 9 is housed in a bottomed cylindrical mounting member 22 fixed between the partition wall 6 and the valve seat member 7, and is disposed between the screen 23 and the upper wall member 11. Conical coil spring 24 as an elastic member disposed in
Biased downwards. The step 25 formed on the inner surface of the attachment member 22 has an effect of holding the temperature control element 9 at a predetermined position by contacting the outer peripheral lower surface of the lower wall member 19. Two fluid passage windows 26 are opened on both sides of the peripheral wall of the mounting member 22.

When the temperature of the fluid flowing into the valve chamber 3 from the inlet 4 is low, the expansion medium 15 contracts, and as shown in FIG.
The first diaphragm 14 is displaced upward. In addition, the second diaphragm 18 formed of bimetal is also deformed upward to make the valve member 16 separate from the valve seat member 7, so that the outlet passage 8 is opened even when the fluid pressure on the inlet 4 side is a small pressure. be able to. Thereby, the low temperature fluid is discharged from the outlet 5.

When the temperature of the fluid flowing into the valve chamber 3 increases due to the discharge of the low-temperature fluid, the second diaphragm 18 becomes substantially flat as shown in FIG. Thereafter, the expansion of the expansion medium 15 causes the first and second diaphragms 14 and 18 to be displaced in the valve-opening direction, and the valve member 16 to be seated on the valve seat member 7 to close the lead-out path 8 and contract the expansion medium. As a result, the first diaphragm 14 is displaced in the valve opening direction, and the second diaphragm 18 is displaced in the valve opening direction due to the fluid pressure on the inlet 4 side that has risen with the rise in temperature.
6 departs from the valve seat member 7 and opens the outlet passage 8.

[0013]

The present invention has the following specific effects. As described above, according to the present invention, since the second diaphragm is formed of the temperature responsive member, the outlet path can be opened even when the fluid pressure on the inlet side is a small pressure. The low-temperature fluid can be discharged in a short time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an operation state of a thermoresponsive steam trap according to an embodiment of the present invention at a low temperature.

FIG. 2 is a cross-sectional view showing a state in which a second diaphragm is deformed from the state of FIG.

[Explanation of symbols]

 3 Valve Chamber 4 Inlet 5 Outlet 7 Valve Seat Member 8 Outlet 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 Through Hole

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 comprising first and second diaphragms having an outer peripheral edge fixed therebetween, an expansion medium sealed between the upper wall member and the first diaphragm, and a valve member connected to the second diaphragm. A through hole is provided in the second diaphragm and the valve member, which is disposed in the room and communicates the surface of the first diaphragm not in contact with the expansion medium and the lead-out path, and the first and second diaphragms are displaced by expansion and contraction of the expansion medium. In opening and closing a lead-out path by attaching and detaching a valve member to and from a valve seat member, a second diaphragm is formed of a temperature responsive member, and the second diaphragm is deformed so as to allow the valve member to separate from the valve seat member at low temperatures. Thermal response characterized by Type steam trap.