JP2741319B2 - 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.

The basic structure of a thermo-responsive steam trap is that a temperature control element in which an expansion medium is sealed in a storage chamber formed by fixing a dish-shaped wall member and an outer peripheral edge of a diaphragm,
The valve member is disposed in the valve chamber communicating with the inlet, and utilizes the expansion and contraction of the expansion medium to drive a valve member connected to the diaphragm and disposed in the valve chamber, thereby forming an outlet path communicating the valve chamber and the outlet. The valve member is adapted to be detached and seated on the valve seat member. When high-temperature steam flows into the valve chamber, the expansion medium expands, and the valve member is seated on the valve seat member to close the outlet passage. This prevents the discharge of steam. Also, when cold condensate flows in,
The expansion medium contracts, causing the valve member to move away from the valve seat member, opening the outlet passage. As a result, the condensate is discharged out of the system. One example of this is disclosed in Japanese Patent Publication No. 60-46318. Although this publication does not disclose a technique for sealing the expansion medium in a storage chamber between the wall member and the diaphragm, it actually requires a means for sealing the expansion medium.

[0003]

2. Description of the Related Art The present applicant has developed a heat-responsive steam trap and filed an application as Japanese Patent Application No. 3-44190. In this method, an inlet for an expansion medium is formed in a wall member, and a steel ball as a plug member is press-fitted into the inlet to seal the wall. In addition, an application filed as Japanese Patent Application No. 3-76781 is to form an inlet for an expansion medium in a wall member and seal the inlet by welding.

[0004]

However, the former requires a high-precision work for press-fitting the steel ball into a predetermined position, and the wall member and the steel member are repeatedly expanded and contracted by a temperature change. There is a problem that the backlash is generated between the ball and the ball and the sealing performance is reduced. In the latter case, there is a problem that the molten weld metal flows into the storage chamber and the diaphragm is damaged.

Accordingly, it is an object of the present invention to provide a simple and reliable method for sealing an inlet.

[0006]

In order to solve the above-mentioned technical problem, the technical means of the present invention is to fix the outer peripheral edge of a diaphragm to the outer peripheral edge of a wall member having an inlet for an expansion medium. A temperature control element in which an expansion medium storage chamber is formed and the injection port is closed with a plug member to seal the expansion medium in the storage chamber is disposed in a valve chamber communicating with the inlet, and the temperature control element is formed by expansion and contraction of the expansion medium. A valve member disposed in the valve chamber is driven by the displacement of the diaphragm to open and close an outlet path communicating the valve chamber and the outlet. In the stopper member, a large diameter portion larger than the opening diameter of the inlet is formed in the plug member, and the large diameter The part and the wall member are fixed by welding.

[0007]

The operation of the above technical means is as follows.
Form a large-diameter part larger than the opening diameter of the injection port on the stopper member,
Since the large diameter portion and the wall member are welded and fixed, the large diameter portion of the plug member is pressed against the injection port of the wall member to fix the plug member at a predetermined position and close the injection port. be able to. Therefore, the molten weld metal does not flow into the storage chamber. Also, there is no play between the wall member and the plug member due to welding.

[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 casing 1 and a lower casing 2 are fastened with bolts 3 to form a valve casing having a valve chamber 4 therein. The airtightness between the two casings 1 and 2 is maintained by an annular gasket 5. An inlet 6 is formed in the upper case 1 and an outlet 7 is formed in the lower case 2.

A valve seat member 9 is screwed to a partition 8 between the valve chamber 4 and the outlet 7. The airtightness between the partition 8 and the valve seat member 9 is maintained by an annular gasket 10. In the center of the valve seat member 9, a through-outflow path 11 that connects the valve chamber 4 and the outlet 7 is formed. An annular groove 12 is formed on the upper surface of the valve seat member 9.

A temperature control element 13 is arranged above the valve seat member 9. As shown in FIG. 2, the temperature control base 13 seals the inlet 14 with a wall member 15 having an inlet 14, a diaphragm 18 that forms a storage chamber 17 for the expansion medium 16 between the wall member 15 and the wall member 15. And a stopper member 19 to be used. A diaphragm 21 for a valve member to which a valve member 20 is fixed is disposed below the diaphragm 18. The valve member diaphragm 21 has a through hole 22 at the center, and the through hole 2
The two edges are bent downward. An annular member 24 having a through hole 23 is disposed between the upper surface of the edge of the through hole 22 and the diaphragm 18.
The annular member 24, the valve member diaphragm 21, and the valve member 20 are welded to each other (at a reference numeral 26) and fixed. The wall member 15, the diaphragm 18, and the valve member diaphragm 21 have their respective outer peripheral edges fixed to the outer peripheral edge of the mounting member 27 by welding each other (at a reference numeral 28). Reference numeral 29 denotes the opening 30
Is welded to the wall member 15 (reference numeral 31).
Location).

An expansion medium 16 is injected into an accommodation chamber 17 formed by the wall member 15 and the diaphragm 18 from an injection port 14 and sealed by closing the injection port 14 with a plug member 19. A large-diameter portion 32 is formed by using a steel ball larger than the opening diameter of the inlet 14 for the plug member 19, and the contact portion between the large-diameter portion 32 and the opening of the inlet 14 is welded (reference numeral 33). Location). The expansion medium 16
It is water, a liquid having a lower boiling point than water, or a mixture thereof. The opening edge bent downward of the mounting member 27 is the annular groove 1.
Fixed to 2. The attachment member 27 has a plurality of windows 34 through which the fluid passes.

When the temperature of the fluid flowing into the valve chamber 4 from the inlet 6 is high, the expansion medium 16 expands, causing the valve member 20 to be displaced downward through the diaphragm 18 and the valve member diaphragm 21. The outlet member 11 is closed by seating the valve member 20 on the valve seat member 9 to prevent the outflow of high-temperature fluid, that is, steam. When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 16 contracts and the valve member 20
However, the fluid pressure on the inlet 6 side is also applied, the seat is separated from the valve seat member 9, the outlet path 11 is opened, and the low-temperature fluid, that is, the low-temperature condensate is discharged from the outlet 7.

Although a spherical plug member is used in the above embodiment, a conical member or a member having a flange portion may be used.

[0014]

The present invention has the following specific effects. As described above, the present invention forms a large-diameter portion larger than the opening diameter of the injection port in the plug member and welds and fixes the large-diameter portion and the wall member, so that the plug member is easily and reliably. The inlet can be sealed.

[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 a valve member portion of FIG.

[Description of Signs] 4 Valve Chamber 6 Inlet 7 Outlet 9 Valve Seat 11 Outlet 13 Temperature Control Element 14 Inlet 15 Wall Member 16 Expansion Medium 17 Storage Room 18 Diaphragm 19 Plug Member 20 Valve Member 32 Large Diameter Part 33 Welding Location

Claims (1)

(57) [Claims] An outer peripheral edge of a diaphragm is fixed to an outer peripheral edge of a wall member having an inlet for an expansion medium, an accommodation chamber for the expansion medium is formed therein, and the inlet is closed by a plug member to accommodate the expansion medium. A temperature control element sealed in a chamber is disposed in a valve chamber communicating with an inlet, and a valve member disposed in the valve chamber is driven by displacement of a diaphragm due to expansion and contraction of an expansion medium, and an outlet path connecting the valve chamber and the outlet. A thermo-responsive steam trap characterized in that a large-diameter portion larger than the opening diameter of the inlet is formed in the plug member, and the large-diameter portion and the wall member are welded and fixed. .