JPH0637268Y2 - Disc type steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a disk type steam trap which is attached to a steam piping system and automatically discharges condensate generated therein. This disc type steam trap has 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 to connect the inlet and the variable pressure chamber. , And an inner ring valve seat between the ejection hole and the annular groove,
An outer ring valve seat is formed around the outer circumference of the annular groove, a discharge hole is opened from the annular groove to connect the variable pressure chamber to the outlet, and a disc-like shape that is seated on and off the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat. This valve disc is placed inside the variable pressure chamber, and the valve disc is automatically controlled by the pressure change in the variable pressure chamber to be seated on and off the valve seat surface, and the condensate is automatically discharged.

2. Description of the Related Art As shown in FIG. 4, the valve disc used in this disc type steam trap has an annular resistance groove formed in a portion of the lower surface of the valve disc 41 facing the annular groove.

The resistance groove 42 increases the frictional resistance of the fluid passing between the valve disc 41 and the valve seat surface, and does not close the valve disc in the condensate, but opens the valve by passing the steam.

Problems to be Solved by the Invention Since the resistance grooves 42 have to close the valve discs when steam passes through the lower surface thereof, the number and depth thereof are limited. Since the resistance groove 42 shown above is fixed, if it is formed so that the valve disk can be closed by passing steam, there is a problem that it takes time to discharge the low temperature condensate water at the time of start-up. That is, the valve disc is sucked up by the valve seat surface and becomes too tight to be fully opened.

Therefore, the technical problem of the present invention is to enable the valve disc to be fully opened at a low temperature.

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 periphery of the ejection hole, an inner ring valve seat is formed between the ejection hole and the annular groove, and an outer ring valve seat is formed on the outer periphery of the annular groove. Place a disc-shaped valve disc that opens and closes the outlet through the annular groove to connect the variable pressure chamber to the outlet and seats on and off the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat. In the case where an annular resistance groove is formed on the lower surface of the facing valve disc, an annular temperature sensitive element is arranged in the resistance groove, and the outer peripheral edge of the temperature sensitive element is on the back wall side of the resistance groove at low temperature. It was designed to be displaced.

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

When the temperature is low, the outer peripheral side of the temperature sensitive element is displaced to the inner wall side of the resistance groove, so that the depth of the resistance groove formed between the outer peripheral side wall of the resistance groove and the lower surface of the temperature sensitive element increases. Therefore,
At low temperatures, the frictional resistance of the cold condensate passing between the valve disc and the valve seat surface is greater and the valve disc can be fully opened.

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

As described above, according to the present invention, since the resistance groove can be enlarged at a low temperature, the valve disc can be fully opened. Therefore, the initial low-temperature condensate can be quickly discharged, the startup time can be shortened, and the productivity can be improved.

Example An example showing a specific example of the above technical means will be described (see FIGS. 1 to 3).

The lid 2 is screwed to the main body 1 to form the transformer chamber 3 inside. The inlet 4 and the outlet 5 are formed in the main body 1 on substantially the same axis.

An injection hole 6 is opened in the center of the main body 1 so that the inlet 4 and the variable pressure chamber 3 can communicate with each other. An annular groove 7 is provided on the outer periphery of the ejection hole 6,
An annular inner ring valve seat 8 is formed between the ejection hole 6 and the annular groove 7, and an annular outer ring valve seat 9 is formed around the annular groove 7. Inner ring valve seat 8
And the outer ring valve seat 9 are concentrically formed on the same plane. The discharge hole 10 is opened from the annular groove 7 to connect the variable pressure chamber 3 and the outlet 5.

A disk-shaped valve disc 11 is arranged in the variable pressure chamber 3. An annular resistance groove 12 is formed on the lower surface of the valve disc 11. The resistance groove 12 is formed at a portion facing the annular groove 7. A plate-shaped annular bimetal 13 having a diameter smaller than the diameter of the groove is arranged in the resistance groove 12. The inner periphery of the bimetal 13 is spot-welded to the inner wall of the resistance groove 12 (reference numerals 14 and 15). At low temperatures, the bimetal 13 is deformed so that its outer peripheral side is convex upward and its inner peripheral side is convex downward as shown in FIG.
As shown enlarged in the figure, it deforms flat. Thus, the resistance groove 12 is formed by the bimetal 13 so as to be large at low temperature and small at high temperature.

In the above embodiment, the bimetal 13 is flat at high temperature,
The outer peripheral side is deformed upward when the temperature is low, but it may be flat when the temperature is low and the outer peripheral side is deformed downward when the temperature is high. Alternatively, an inverted bimetal may be used to deform downward at low temperature and upward at high temperature.

[Brief description of drawings]

FIG. 1 is a sectional view of a disc type steam trap according to an embodiment of the present invention, FIGS. 2 and 3 are enlarged sectional views of a valve disc showing high temperature and low temperature, respectively, and FIG. 4 is a conventional valve disc. FIG. 1: Main body, 2: Lid 3: Transformer chamber, 4: Inlet 5: Outlet, 7: Annular groove 11: Valve disc, 12: Resistance groove 13: Bimetal

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 is formed between the ejection hole and the annular groove, and the outer ring valve seat is formed around the outer periphery of the annular groove.The discharge hole is opened from the annular groove to connect the variable pressure chamber to the outlet. A disk-shaped valve disc, which is seated on and off the valve seat surface, is arranged in the variable pressure chamber, and an annular resistance groove is formed on the lower surface of the valve disc facing the annular groove. A disk-type steam trap in which an annular temperature-sensitive element is arranged on the inside so that the outer peripheral edge of the temperature-sensitive element is displaced toward the back wall side of the resistance groove when the temperature is low.