JPH0629598Y2 - Disc type steam trap - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a disc type steam trap which is attached to a steam piping system to automatically discharge condensate generated therein.
In particular, the present invention relates to a valve disc capable of preventing so-called idling and blow-off, in which the valve disc frequently repeats opening / closing even though the condensate is not accumulated on the inlet side.

Conventional technology Disc-type steam traps have a main body and a lid that form a variable pressure chamber inside, and an injection hole is opened in the center of the main body on the variable pressure chamber side so that the inlet and the variable pressure chamber communicate with each other. An annular groove is provided to form an inner ring valve seat between the ejection hole and the annular groove, and an outer ring valve seat concentric with the inner ring valve seat and flush with the outer periphery of the annular groove. A disk-shaped valve disk, which connects the variable pressure chamber to the outlet and is seated on and off the valve seat surface consisting of an inner ring valve seat and an outer ring valve seat, is arranged in the variable pressure chamber. The valve disc is automatically controlled by the pressure change in the variable pressure chamber to be seated on or off the valve seat surface, and the condensate is automatically discharged.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Present Invention In this disc type steam trap, the valve closing time from the valve closing to the next valve opening operation can be maintained long as long as the condensed water does not excessively stay on the inlet side. Is preferred. However, since the valve discs are shockedly seated on the inner and outer ring valve seats to close the valve, the abutment part between the valve disc and the valve seat is likely to wear, and when the valve is closed, the steam in the variable pressure chamber leaks and pressure is applied in a short time. As a result, the valve closing time is shortened.
Also, if this valve closing time is shortened, the amount of condensate accumulated on the inlet side will decrease, so the valve opening time from the valve opening to the next valve closing operation will also be shortened, and if the pressure inside the variable pressure chamber does not rise sufficiently. Will be closed. Then, there was a problem that the valve closing time was further shortened, and during this repetition, blank hitting occurred, and eventually steam was blown off.

Therefore, the technical problem of the present invention is to prevent the valve disc and the valve seat from being idled or blown out even when the valve disc is worn.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem is to form a variable pressure chamber inside with a main body and a lid, and eject the gas into the center of the main body on the variable pressure chamber side. A hole is made to communicate with the inlet and the variable pressure chamber, an annular groove is provided on the outer circumference of the ejection hole, an inner ring valve seat is provided between the ejection hole and the annular groove, and a concentric circle with the inner ring valve seat is provided on the outer circumference of the annular groove. Disc-shaped valve disc that forms an outer ring valve seat on the same plane, opens a discharge hole from the annular groove to connect the variable pressure chamber to the outlet, and separates from and sits on the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat. In the transformer chamber, a temperature-responsive valve is placed in the passage from the discharge hole to the outlet, and the passage area is narrowed at high temperature due to the deformation of the temperature-responsive valve due to temperature change. It is a thing.

Action The action of the above technical means is as follows.

If the steam in the variable pressure chamber leaks when the valve is closed and the opening and closing times become shorter, the temperature of the passage leading from the discharge hole to the outlet gradually rises.Therefore, the temperature-responsive valve placed in the passage based on this temperature change Narrows the area of the passage. Then, since the flow resistance of the exhaust flow increases, the exhaust fluid easily flows into the variable pressure chamber and the pressure in the variable pressure chamber further increases before closing the valve, which can prolong the valve closing time. The valve opening time can be extended. Therefore, there is no occurrence of blank hitting or blown air.

Effect of the Invention The present invention has the following unique effects.

As described above, according to the present invention, even if the valve disc and the valve seat are worn, no blanking or blowout occurs, so that steam loss can be prevented.

Further, even if dust or the like is caught between the valve disc and the valve seat and blown away, the temperature-responsive valve is further deformed to close the passage, so that it can also serve as a stop valve and prevent steam loss. .

Example An example showing a specific example of the above technical means will be described (see FIG. 1).

The lid 2 is screwed to the main body 1 to form the transformer chamber 3 inside. An inlet 5 and an outlet 6 are formed in the main body 1 on substantially the same axis.

An injection hole 7 is opened in the center of the main body 1 so that the inlet 5 and the variable pressure chamber 3 can communicate with each other. An annular groove 9 is provided on the outer periphery of the ejection hole 7,
An annular inner ring valve seat 10 is formed between the ejection hole 7 and the annular groove 9, and an annular outer ring valve seat 11 is formed on the outer periphery of the annular groove 9. The inner ring valve seat 10 and the outer ring valve seat 11 are concentric and are formed on the same plane. The discharge hole 12 is opened from the annular groove 9 to open the variable pressure chamber 3 and the outlet 6.
To communicate.

A disk-shaped valve disc 13 is arranged in the variable pressure chamber 3.

The valve rod 15 is screwed to the main body 1 so as to be able to move forward and backward. Valve rod 15
The tip of the is protruded from the discharge hole 12 into the passage leading to the outlet 6, and the bellows 16 is attached to the tip. Wax is enclosed in the bellows 16 as a temperature sensitive material. The valve body 17 is attached to the tip of the bellows 16. The bellows 16 and the valve body 17 form a temperature sensitive valve. Reference number 18
Is a lock nut, and 19 is a groove into which a tip of a driver or the like for rotating the valve rod 15 is fitted.

When the temperature of the passage leading from the discharge hole 12 to the outlet 6 rises, the bellows 16 expands and the valve body 17 narrows the area of the passage. When the temperature rises further, the passage is closed.

[Brief description of drawings]

FIG. 1 is a sectional view of a disk type steam trap according to an embodiment of the present invention. 1: Main body, 2: Lid body 3: Transformer chamber, 5: Inlet 6: Outlet, 10: Inner ring valve seat 11: Outer ring valve seat, 12: Discharge hole 13: Valve disc, 16: Bellows 17: Valve body

Claims (1)

[Scope of utility model registration request] 1. A main body and a lid form a variable pressure chamber inside, and an injection hole is opened in the center of the main body on the variable pressure chamber side so that the inlet and the variable pressure chamber communicate with each other, and an annular groove is provided around the outer periphery of the injection hole. The inner ring valve seat between the ejection hole and the annular groove, and the outer ring valve seat concentric with the inner ring valve seat and flush with the inner surface of the annular groove.The discharge hole is opened from the annular groove to exit the variable pressure chamber. A disc-shaped valve disc that is placed in and out of contact with the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat is placed inside the variable pressure chamber. A disc type steam trap in which a valve is placed and the passage area is narrowed at high temperature by the deformation action of the temperature sensitive valve due to temperature change.