JPH05296392A - Disc type steam trap - Google Patents

Abstract

PURPOSE:To obtain a disc type steam trap which is constituted so that the low temperature air in the initial stage of ventilation can be discharged by a temperature sensing member which has a slight displacement force and a displacement quantity. CONSTITUTION:An inlet 2 and a pressure varying chamber 4 are allowed to communicate through an effluence hole 11. A bimetal ring 12 is installed at the upper part of the effluence hole 11 through a stop ring 15. At a low temperature, the bimetal ring 12 contracts to reduce the area of a through hole 16, while at a high temperature, the diameter of the bimetal ring 12 spreads to increase the area of the through hole 16.

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 a steam piping system,
The present invention relates to a disc type steam trap in which a valve disc opens and closes in response to a pressure change in a transformer chamber, that is, a thermodynamic steam chamber. The closing of the disc-type steam trap depends on the flow velocity of the fluid flowing down the bottom surface of the valve disk as the pressure in the variable pressure chamber changes. That is, the flow velocity when condensate as a liquid is flowing down the lower surface of the valve disc is relatively slow, and the flow velocity when vapor as a gas is flowing down is high. If steam flows down, it will close. In the steam trap installed in the steam piping system, a large amount of low-temperature air or low-temperature condensate in the piping or steam-using device flows into the steam trap at the start of use of steam, but when air comes in, steam Similarly, since the flow velocity is high, the valve disc may be closed and its discharge may be impossible. When air stays in the trap, the pressure drop due to heat dissipation does not occur, so the trap remains closed and the condensate stays on the inlet side.

[0002]

2. Description of the Related Art As a conventional disk type steam trap capable of discharging low-temperature air, for example, a real fair 3
There is one disclosed in Japanese Patent Publication No. 25517. By arranging the bimetal and the operating member below the valve disc, the bimetal expands at low temperature and the valve disc is forcibly opened via the operating member, so that the low temperature air is discharged from the steam trap. It is a thing.

[0003]

The above-mentioned conventional disc type steam trap requires a bimetal having a displacement force and a displacement amount enough to forcibly open the valve disc, and the bimetal becomes long. There was also a problem that a thick material had to be used.

Therefore, a technical object of the present invention is to obtain a disk type steam trap capable of discharging low temperature air with a temperature responsive member having a relatively small displacement force and displacement amount.

[0005]

In order to solve the above technical problems, the technical means of the present invention is to mount a lid member on a main body having an inlet and an outlet so that the inlet and the outlet are opened inside. A variable pressure chamber is formed, a valve seat surface consisting of inner and outer ring valve seats is formed at the inlet and outlet variable chamber side opening ends, and an annular groove is formed between the inner and outer ring valve seat surfaces to form a valve seat of the inner and outer ring valve seats In a variable pressure chamber in which a valve disc that is seated on or off a surface is arranged in a variable pressure chamber, a temperature responsive member that reduces the passage area at low temperatures and increases the passage area at high temperatures is arranged between the passages from the annular groove to the outlet. Is.

[0006]

The operation of the above technical means is as follows.
By placing a temperature responsive member between the passage from the annular groove of the disc steam trap to the outlet, the outlet passage will be throttled when the temperature of the fluid in the trap is low and a large amount of fluid will flow down at high speed. There is no. Therefore, in this state, even if the low-temperature air flows down, the lower surface of the valve disc does not flow down at a high speed, so that the low-temperature air can be discharged without closing the valve disc.
When the temperature of the fluid becomes high, the temperature responsive member enlarges the passage area, thereby performing the same operation as the conventional trap, that is, the operation of closing the valve disc when the steam flows down.

[0007]

EXAMPLES Examples showing specific examples of the above technical means will be described (see FIGS. 1 to 3). An inlet 2 and an outlet 3 are formed on the same axis of the main body 1, and a transformation chamber 4 communicating with the inlet 2 and the outlet 3 is formed by the lid member 5 and the main body 1. An inner ring 6 and an outer ring 7 are concentrically formed at the opening ends of the inlet 2 and the outlet 3 on the variable pressure chamber 4 side, and the upper ends thereof are valve seat surfaces 8. A disc-shaped valve disc 9 is arranged on the valve seat surface 8. The inlet 2 and the variable pressure chamber 4 communicate with each other through an inflow hole 10 formed in the inner ring 6. An annular groove 13 is formed between the inner ring 6 and the outer ring 7, and an outflow hole 11 is provided to connect the variable pressure chamber 4 and the outlet 3. A bimetal ring 12 as a temperature responsive member is attached between the annular groove 13 and the outflow hole 11 via a retaining ring 15. The bimetal ring 12 has an end shape and is provided with a through hole 16 in the center thereof, so that the opening area of the through hole 16 changes in accordance with a change in temperature. In the state shown in FIG. 1, the fluid temperature rises and the bimetal ring 1
2 shows a state in which the diameter is expanded, and the through hole 16 has a size substantially the same as that of the outflow hole 11. When the temperature of the fluid is low such as when the vapor is started to be ventilated in the trap, the bimetal ring 12 contracts and the area of the through hole 16 is also reduced as shown in FIG. Since the upper part of the outflow hole 11 is narrowed, the low temperature air flowing down from the inflow hole 10 cannot flow down at a high speed, and the static pressure drop that occurs on the lower surface of the valve disc 9 becomes insignificant, and the valve disc closes. There is nothing to do.

FIG. 3 shows an example in which a bimetal ring is used as another temperature responsive member. A spiral bimetal ring 20 is provided with an outflow hole 11 as shown in FIG.
It is attached so as to be located on the outer periphery of the upper part of. When the temperature is low, the spiral of the bimetal ring 20 contracts and covers the outflow hole 11, thereby narrowing the passage and preventing the valve disk 9 from being closed by low temperature air.

[0009]

As described above, according to the present invention, low temperature air can be reliably discharged by narrowing the outlet side passage by utilizing the slight displacement force and displacement amount of the temperature responsive member.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a disk type steam trap of the present invention.

FIG. 2 is a partial cross-sectional view of a main part of a bimetal ring part in FIG.

FIG. 3 is a partial cross-sectional view of an essential part of another embodiment of the bimetal ring portion of the disk type steam trap of the present invention.

[Explanation of symbols]

 1 Main Body 2 Inlet 3 Outlet 4 Transformer Chamber 5 Lid Member 6 Inner Ring 7 Outer Ring 8 Valve Seat Surface 9 Valve Disc 10 Inlet Hole 11 Outlet Hole 12 Bimetal Ring 20 Bimetal Ring

Claims (1)

[Claims] 1. A cover member is attached to a main body having an inlet and an outlet to form a variable pressure chamber in which the inlet and the outlet open,
A valve seat surface composed of inner and outer ring valve seats is formed at the opening ends of the inlet and outlet on the variable pressure chamber side, and an annular groove is formed between the inner and outer ring valve seat surfaces.
In the one in which the valve disc that is seated on and off the valve seat surface of the inner and outer ring valve seats is arranged in the variable pressure chamber, the passage area between the annular groove and the outlet is reduced at low temperature and increased at high temperature. A disk-type steam trap, which is provided with a temperature-responsive member.