JP2711594B2 - Disc type 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 disk type steam trap which is attached to various steam-using devices and steam piping systems and automatically discharges condensate generated therein.

[0002]

2. Description of the Related Art Conventional disk type steam traps are:
A transformation chamber is formed inside the main body and the lid, an introduction path and an exit path for connecting the inlet and the outlet to the transformation chamber are formed, and the transformation chamber side opening of the introduction path and the exit path is formed on the same plane, and the introduction is performed. A disc-shaped valve disk that is seated and unseated on the transformer chamber opening of the passage and the outlet passage is placed in the transformer chamber, and the valve disk is automatically controlled by the pressure change in the transformer chamber to open and close the inlet passage and outlet passage. , And the condensate is automatically discharged.

[0003]

DISCLOSURE OF THE INVENTION
The steam trap closes when the steam flows through the lower surface of the valve disk at high speed.However, even when air passes, the valve closes in the same way as steam. Since this does not occur, there was a problem that the valve could not be opened and so-called air binding occurred.

Accordingly, it is an object of the present invention to provide a disk type steam trap which does not cause air binding.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form a transformer chamber inside by attaching a lid to a main body having an inlet and an outlet, The inlet and outlet are connected to the transformer chamber, and the inlet and outlet are formed in the main body.The transformer chamber-side opening ends of the inlet path and the outlet path are formed on the same plane, and the inlet path and the outlet path are connected to the transformer chamber-side opening ends. In the case where the valve disk to be detached and seated is arranged in the variable pressure chamber, the valve disk is composed of a large-diameter disk and a small-diameter disk arranged vertically movably at the center of the large-diameter disk. A holding member is attached to the upper surface of a large-diameter disk via a diaphragm, and an expansion medium is sealed between the diaphragm and the holding member so that the lower surface of the large-diameter disk and the lower surface of the small-diameter disk are substantially flush when the expansion medium expands. A.

[0006]

The operation of the above technical means is as follows.
The expansion medium accommodated between the diaphragm and the holding member expands when the temperature of the surrounding fluid is high, and contracts when the temperature of the surrounding fluid is low. At startup, low temperature air and condensate flow into the trap, causing the expansion medium to contract and the small diameter disc to be displaced above the lower surface of the large diameter disc. Therefore,
The grooves formed on the lower surfaces of the large-diameter disk and the small-diameter disk provide resistance to the passage of low-temperature air and condensate, so that the valve disk does not close and no air binding occurs.

Next, when high-temperature air passes through the lower surface of the valve disk during operation, the expansion medium expands at this time, and the lower surfaces of the large-diameter disk and the small-diameter disk are made substantially flush with each other. Although the valve is closed, when the temperature of the transformer chamber decreases, the expansion medium contracts, and the small-diameter disk opens. Thus, the large-diameter disc is also lifted by the flow of the condensate from the introduction path, and the valve is opened to prevent air binding.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 3). A lid 2 is screwed to the main body 1 to form a valve casing, and a transformer chamber 3 is formed between the two. An inlet 4 and an outlet 5 are formed on the main body 1 on the same axis. Open the introduction path 6 in the center of the main body 1 and enter the entrance 4 and the transformation chamber 3
To communicate. An annular groove 7 is provided around the outside of the introduction path 6,
The transformer chamber 3 and the outlet 5 are communicated via the outlet 8. The opening end of the introduction path 6 on the transformer chamber 3 side and the opening end of the lead-out path 8 via the annular groove 7 on the transformer chamber 3 side are formed on the same plane.

[0009] A valve disk is arranged in the transformer chamber 3. The valve disk comprises a large-diameter disk 9 and a small-diameter disk 10 arranged at the center thereof so as to be movable up and down. Small diameter disc 1
The diaphragm 11 is fixed to the upper surface. Diaphragm 1
The holding member 12 is arranged on the upper surface of the first member 1, and the outer circumferences of the large-diameter disk 9, the diaphragm 11, and the holding member 12 are welded and fixed (at reference numeral 14). Diaphragm 1
An expansion medium 13 is sealed between the holding member 1 and the holding member 12. The expansion medium 13 is formed of water, a fluid having a lower boiling point than water, or a mixture thereof.

FIG. 1 shows the valve closed state. That is,
The expansion medium 13 expands and displaces the small-diameter disk 10 downward through the diaphragm 11, and the lower surfaces of the large-diameter disk 9 and the small-diameter disk 10 are the same. The side opening is closed. When the steam in the transformer chamber 3 is condensed by heat radiation from the peripheral wall of the transformer chamber 3, the large-diameter disk 9 and the small-diameter disk 1
0 opens the valve.

FIG. 2 shows the valve open state. That is,
The expansion medium 13 contracts, and the lower surface of the small-diameter disk 10 is displaced above the lower surface of the large-diameter disk. Then, as the temperature of the discharged condensate rises, the expansion medium 13 expands, displacing the small-diameter disk 10 downward, and the lower surfaces of the large-diameter disk 9 and the small-diameter disk 10 are made substantially flush. Then, the steam passes through the passage between the lower surface of the disk 9 and the upper end of the introduction path 6 and the upper end of the extraction path 8, whereby the valve disk 9 is closed.

As the temperature of the transformer chamber 3 decreases, the expansion medium 13 contracts, the diaphragm 11 and the small-diameter disk 10 are displaced upward, and the small-diameter disk 10 opens. This allows
The large-diameter disk 9 also opens.

At the time of startup, since low-temperature air and condensate flow into the trap, the expansion medium 13 contracts, and the small-diameter disk 10 is displaced above the lower surface of the large-diameter disk 9. Accordingly, the grooves formed on the lower surfaces of the large-diameter disk 10 and the small-diameter disk 9 provide resistance to the passage of low-temperature air and condensate, so that the valve disk does not close and no air binding occurs.

When high-temperature air passes through the lower surface of the valve disk during operation, the expansion medium 13 expands at this time, and the lower surfaces of the large-diameter disk 9 and the small-diameter disk 10 are substantially flush with each other. Diameter disc 9 and small diameter disc 1
0 is closed, but when the temperature of the variable pressure chamber 3 decreases, the expansion medium 13 contracts, and the small-diameter disk 10 opens. Accordingly, the large-diameter disk 9 is also lifted by the flow of the condensate from the introduction path 6 and is opened to prevent air binding.

[0015]

As described above, according to the present invention, since no air binding occurs, there is no danger that the efficiency of a steam-using device is reduced or a water hammer is generated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a closed state of a disk type steam trap according to the present invention.

FIG. 2 is a cross-sectional view of only a main part of the disc-type steam trap according to the present invention, showing a valve open state of the steam trap;

FIG. 3 is an enlarged sectional view of a valve disk portion of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Transformation chamber 4 Inlet 5 Outlet 6 Introducing path 8 Outgoing path 9 Large diameter disk 10 Small diameter disk 11 Diaphragm 13 Expansion medium

Claims (1)

(57) [Claims] 1. A transformer body is formed by attaching a lid to a main body having an inlet and an outlet formed therein, and an inlet path and an outlet path for connecting the inlet and the outlet to the transformer chamber are formed in the main body. The opening end of the passage on the side of the transformation chamber is formed on the same plane, and the valve disk which is seated at the opening end of the introduction path and the exit path on the side of the transformation chamber is arranged in the transformation chamber. It consists of a small-diameter disk that can be moved up and down at the center, a diaphragm is adhered to the upper surface of the small-diameter disk, a holding member is attached to the upper surface of the large-diameter disk via the diaphragm, and an expansion medium is placed between the diaphragm and the holding member. A disk-type steam trap which is enclosed so that the lower surfaces of the large-diameter disk and the small-diameter disk are substantially flush when the expansion medium is expanded.