JPH06129598A - Thermal responsive type steam trap - Google Patents

Abstract

PURPOSE:To provide a steam trap of thermally responsive type which can simply and certainly seal an injection hole for an expansive medium formed in a wall member. CONSTITUTION:The peripheral edge of a wall member 15 having an injection hole 14 for an expansive medium 16 is secured to the peripheral edge of a diaphragm 18 to whose center opening a valve member 20 is secured, and inside thereof an accommodation chamber 17 is formed for the expansive medium 16. A steel ball having a greater diameter than the opening diameter of the injection hole 14 is used as a plug 19 to seal the injection hole 14, and the major diameter part 25 of the plug 19 is welded 26 to the opening part of the injection hole 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, it is heated and cooled by steam and condensate and expands according to its temperature. The present invention relates to a heat-actuated steam trap that discharges condensed water below a desired temperature to the outside of a system by using a temperature control element containing a contracting medium.

A basic structure of a heat-actuated steam trap is to seal an expansion medium in a storage chamber formed by fixing an outer peripheral edge of a diaphragm having a valve member fixed to a central opening and an outer peripheral edge of a dish-shaped wall member. The temperature control element is placed in the valve chamber communicating with the inlet, and the expansion / contraction of the expansion medium is used to drive the valve member fixed to the diaphragm, thereby leading the valve chamber communicating with the outlet. A valve seat member having a passage is configured to allow the valve member to be seated on and off. When high temperature steam flows into the valve chamber, the expansion medium expands,
The valve member is seated on the valve seat member and the lead-out path is closed. This prevents the discharge of steam. Also, when cold condensate flows in, the expansion medium contracts, causing the valve member to separate from the valve seat member and opening the outlet path. by this,
Discharge the condensate out of the system. An example of this is Japanese Patent Publication No. 60-46
No. 18 publication. Although this publication does not disclose a technique for sealing the expansion medium in the 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 applicant of the present invention has developed a heat-actuated steam trap and applied for it as Japanese Patent Application No. 3-44190. In this method, an expansion medium injection port is formed in the wall member, and a steel ball as a plug member is press-fitted into the injection port to seal the expansion medium. Further, the application filed as Japanese Patent Application No. 3-76781 is to form an expansion medium injection port in a wall member and seal the injection port by welding.

[0004]

However, in the former case, a high precision work is required to press fit the steel ball into a predetermined position, and the wall member and the steel are not removed during repeated expansion and contraction due to temperature change. There is a problem that backlash occurs between the ball and the sealing performance. Further, in the latter case, there is a problem that the molten weld metal flows into the accommodation chamber and the diaphragm is damaged.

Therefore, the technical problem of the present invention is to make it possible to seal the inlet easily and reliably.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problem is a wall having an inlet of an expansion medium at the outer peripheral edge of a diaphragm having a valve member fixed to a central opening. A temperature control element, which is fixed to the outer peripheral edge of the member, forms an accommodation chamber for the expansion medium inside and seals the expansion medium in the accommodation chamber by closing the injection port with a plug member, is arranged in the valve chamber communicating with the inlet. However, in the case where the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to open and close the outlet passage that connects the valve chamber and the outlet, a large diameter portion larger than the opening diameter of the inlet is formed in the plug member. The large diameter portion and the wall member are welded and fixed to each other.

[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 plug member,
Since the large-diameter portion and the wall member are welded and fixed to each other, the large-diameter portion of the stopper member is pressed against the inlet of the wall member to fix the stopper member at a predetermined position and close the inlet. be able to. Therefore, the molten weld metal does not flow into the accommodation chamber. Further, there is no backlash between the wall member and the plug member due to welding.

[0008]

EXAMPLE An example showing a concrete 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 inside. The airtightness between the two casings 1 and 2 is maintained by an annular gasket 5. An inlet 6 is formed in the upper casing 1 and an outlet 7 is formed in the lower casing 2.

A valve seat member 9 is screwed to a partition wall 8 between the valve chamber 4 and the outlet 7. Airtightness between the partition wall 8 and the valve seat member 9 is maintained by an annular gasket 10. At the center of the valve seat member 9, a penetrating lead-out passage 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 foundation 13 includes a wall member 15 having an inlet 14, a plug member 19 for sealing the inlet 14 of the wall member 15, a diaphragm 18 having a central opening, and a diaphragm 18. The valve member 20 is fixed by closing the central opening, and the expansion medium 16 is formed by the wall member 15, the diaphragm 18 and the valve member 20.
The accommodation chamber 17 is formed. The valve member 20 is fixed to the central opening of the diaphragm 18 by welding (at a reference numeral 22) together with the holding disk 21. The outer peripheral edges of the wall member 15 and the diaphragm 18 are fixed to each other by welding (at the reference numeral 24) to the outer peripheral edge of the mounting member 23.

The expansion medium 16 is injected into the accommodating chamber 17 from the injection port 14 and is closed by closing the injection port 14 with the plug member 19. A large-diameter portion 25 is formed in the plug member 19 by using a steel ball larger than the opening diameter of the injection port 14, and a contact portion between the large-diameter portion 25 and the opening portion of the injection port 14 is welded (reference numeral 26). (The place of) and is fixed. The expansion medium 16 is water, a liquid having a lower boiling point than water, or a mixture thereof. An opening edge bent downward of the mounting member 23 is fixed to the annular groove 12. The attachment member 23 is formed with a plurality of windows 27 through which the fluid passes.

When the temperature of the fluid flowing from the inlet 6 into the valve chamber 4 is high, the expansion medium 16 expands and displaces the valve member 20 downward through the diaphragm 18, so that the valve member 20 is moved to the valve seat member. It is seated at 9 and the outlet 11 is closed to prevent outflow of hot fluid, ie 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 is also separated from the valve seat member 9 by applying the fluid pressure on the inlet 6 side to open the outlet passage 11. The low temperature fluid, that is, the low temperature condensate, is discharged from the outlet 7.

Although the 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 produces the following unique effects. As described above, the present invention forms a large-diameter portion that is 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 it is simple and reliable. The inlet can be sealed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat-actuated steam trap according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a valve member portion of FIG.

[Explanation of symbols]

 4 valve chamber 6 inlet 7 outlet 9 valve seat member 11 outlet path 13 temperature control element 14 inlet 15 wall member 16 expansion medium 17 accommodating chamber 18 diaphragm 19 plug member 20 valve member 25 large diameter portion 26 welding location

Claims (1)

[Claims] 1. An outer peripheral edge of a diaphragm having a valve member fixed to a central opening thereof is fixed to an outer peripheral edge of a wall member having an inlet for the expansion medium to form an accommodation chamber for the expansion medium, and the inlet is a plug member. A temperature control element, in which the expansion medium is sealed in the storage chamber by closing it, is placed in the valve chamber communicating with the inlet, and the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to communicate the valve chamber with the outlet. In the one that opens and closes the outlet passage, a large-diameter portion larger than the opening diameter of the injection port is formed in the plug member, and the large-diameter portion and the wall member are welded and fixed to each other. Steam trap.