JP2884307B2 - 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.

When a high-temperature fluid having a predetermined temperature or more flows into the valve chamber, the expansion medium expands, displacing the diaphragm in the valve closing direction, seating the valve member on the valve seat member, and closing the outlet passage. This prevents the discharge of steam. When a low-temperature fluid having a predetermined temperature or less flows, the expansion medium contracts, and the diaphragm is displaced in the valve opening direction by the fluid pressure in the valve chamber, so that the valve member is separated from the valve seat member and the outlet path is opened. . As a result, condensate and air are discharged out of the system.

[0004]

However, in such a thermoresponsive steam trap of this type, there is a problem that it takes time to discharge a large amount of the low-temperature fluid accumulated at the time of starting. This is because the expansion medium contracts at the time of startup, and the valve member is separated from the valve seat member to open the lead-out path.However, since the gap between the valve member and the valve seat member is narrow, a large amount of low-temperature fluid This is because it takes time to discharge the wastewater.

Accordingly, it is an object of the present invention to provide a thermoresponsive steam trap capable of rapidly discharging a large amount of low-temperature fluid by increasing a gap between a valve member and a valve seat member at the time of starting.

[0006]

In order to solve the above-mentioned technical problems, the technical means of the present invention is to provide a valve seat in which an inlet, a valve chamber, and an outlet are formed by valve casing and an outlet path is provided. 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 temperature responsive member is provided for holding the element in a fixed position in the valve chamber at a high temperature and separating the element from a valve seat member at a low temperature.

[0007]

The operation of the above technical means is as follows.
At the time of starting, the temperature in the valve chamber is low, the expansion medium is contracted, and the valve member is separated from the valve seat member to open the outlet path. At this time, the temperature responsive member separates the temperature control element from the valve seat member. Thereby, a sufficient discharge flow path can be secured between the valve member and the valve seat member, and a large amount of low-temperature fluid can be discharged quickly. When the temperature of the inflow fluid increases due to the discharge of the low-temperature fluid, the temperature responsive member causes the temperature control element to be held at a fixed position in the valve chamber, and the gap between the valve member and the valve seat member becomes a normal gap. Thereafter, as in the conventional case, the valve member is detached and seated on the valve seat member via the diaphragm by the expansion and contraction of the expansion medium, and the outlet path is opened and closed.

[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
And a stopper 20 fixed to the upper wall member 11. 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 21 fixed and sandwiched between the partition wall 6 and the valve seat member 7. It is held by a temperature responsive member 22 formed in a coil shape from a fixed shape memory alloy. A screen 23 is disposed between the upper end surface of the mounting member 21 and the upper casing 1. The temperature responsive member 22 contracts when the temperature is low as shown in FIG. 1 and pulls up the temperature control element 9 to increase the gap between the valve member 16 and the valve seat member 7, as shown in FIG. It extends and pushes down the temperature control element 9 to hold the outer peripheral lower surface of the lower wall member 19 against the stepped portion 24 formed on the inner surface of the mounting member 21, and the gap between the valve member 16 and the valve seat member 7. Make the gap a normal gap. Two fluid passage windows 25 are opened on both sides of the peripheral wall of the mounting member 21.

At the time of starting, the temperature in the valve chamber 3 is low, the expansion medium 15 contracts, and as shown in FIG.
Is lifted by the fluid pressure in the valve chamber 3 and the valve member 16
Is separated from the valve seat member 7 to open the outlet passage 8. Further, the temperature control element 9 is pulled up by the contraction of the temperature responsive member 22, and a large amount of the low temperature fluid is quickly discharged by the valve member 16 being largely separated from the valve seat member 7.

When the temperature of the fluid flowing into the valve chamber 3 increases due to the discharge of the low-temperature fluid, the temperature responsive member 2
2, the temperature control element 9 is pushed down, and the gap between the valve member 16 and the valve seat member 7 becomes a normal gap. Thereafter, the valve member 16 is detached and seated on the valve seat member 7 by the expansion and contraction of the expansion medium 15, and the outlet path 8 is opened and closed.

[0013]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
Since a large amount of low-temperature fluid can be quickly discharged at the time of starting, the start-up time of the equipment using steam can be reduced, and the operation rate can be increased.

[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 the temperature responsive member is deformed from the state 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 mounting member 22 temperature responding member 24 steps Department

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 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 having a temperature responsive member for holding a temperature control element at a fixed position in a valve chamber at a high temperature and separating the temperature control element from a valve seat member at a low temperature.