JP3113961B2 - Steam trap that opens with temperature difference and closes with pressure difference - Google Patents

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 various steam-using equipment and steam pipes, and more particularly to a temperature trap including a medium which is heated and expanded, cooled and contracted. The present invention relates to a steam trap for discharging condensed water below a desired temperature to the outside of a system by using a control element.

[0002]

2. Description of the Related Art A steam trap using a temperature control element is disclosed in, for example, Japanese Patent Publication No. 1-31080. As understood from the publication, a valve chamber having an inlet and an outlet opened therein is formed by casing, and a temperature control element comprising a wall member, a diaphragm member, and an expansion medium housed between both members is provided. It is arranged in a valve chamber, and the valve opening formed at the valve chamber side opening end of the outlet is opened and closed by displacement of the diaphragm due to expansion and contraction of the expansion medium.

[0003]

In the above-mentioned prior art, when the temperature in the valve chamber decreases, the expansion medium contracts, the diaphragm is displaced in the valve opening direction to open the valve port, and when the temperature in the valve chamber increases, expansion occurs. The medium expands and displaces the diaphragm in the valve closing direction to close the valve port. In this case, since the temperature rise in the valve chamber is delayed more than the temperature rise of the fluid flowing into the valve chamber, the above-described conventional apparatus has a problem that steam leakage occurs due to a delay in closing the valve.

Accordingly, a technical problem of the present invention is to provide a temperature control element that opens with a temperature difference and closes with a pressure difference, thereby closing the valve before steam flows into the valve chamber. Another object of the present invention is to provide a steam trap that does not cause steam leakage.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form a valve chamber having an inlet and an outlet opened therein by casing, and to form a valve chamber with the wall member. inflation medium and diamonds housed between the diaphragm member and the two members
The valve member Toka et consisting Temperature controller element attached to Fulham disposed in the valve chamber, the form <br/> formed in valve seat member attached to the valve chamber side opening end of the outlet by the displacement of the diaphragm due to contraction of the expansion medium in which opening the valve port, preparative temperature controller element
Housed in the attachment member, and the valve seat surface of the valve
Only at the same height as the passage from the inlet
Small area and opening almost parallel to the valve seat surface of the valve seat member
In Mutorappu - steel which closes at a valve opening to pressure difference at the temperature difference, characterized in that a the throttle channel unit.

[0006]

The operation of the above technical means is as follows.
When the temperature in the valve chamber decreases, the expansion medium contracts, displacing the diaphragm in the valve opening direction, opening the valve port, and discharging the low-temperature condensate to the outlet. When the temperature of the condensate flowing into the valve chamber gradually rises due to the discharge of the low-temperature condensate, the high-temperature condensate has a smaller viscosity and a larger enthalpy than the low-temperature condensate, so that the velocity energy is larger. And the valve member and valve seat
Flows between the wood faster than cold condensate, hot condensate flowing between the valve member and the valve seat member through the aperture Riryuro part valve member
Between the valve member and the valve seat member at a higher speed .
The pressure during this time is lower than the pressure inside the temperature control element. Due to this pressure difference, the diaphragm is displaced in the valve closing direction before steam flows into the valve chamber, and the valve port is closed more quickly. As described above, the valve is quickly closed by utilizing the pressure difference caused by the rapid flow of the high-temperature condensate, so that no steam leakage occurs.

[0007] The flow rate of the condensed water is increased by reducing the size of the throttle flow path, and the valve can be closed at a lower temperature. Can be closed at a temperature close to.
Thus, by adjusting the size of the throttle passage section, the valve closing temperature can be changed.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is connected to the main body 1 by a bolt (not shown).
Formed by A casing is constituted by the main body 1 and the lid member 5, and the airtightness between the two is formed by an annular gasket 6.
Is kept in. A screen 7 is interposed on a passage extending from the inlet 2 to the valve chamber 4 to supplement foreign substances such as dust. Exit 3
A valve seat member 9 having a valve port 8 for communicating the valve chamber 4 and the outlet 3 is screwed to the opening end of the valve chamber 4 on the side of the valve chamber 4.

A temperature control element 10 is arranged above the valve seat member 9. The temperature control element 10 includes an upper wall member 12 having an inlet 11, a plug member 13 for sealing the inlet 11,
A diaphragm 15 forming a storage chamber 14 with the upper wall member 12, an expansion medium 16 sealed in the storage chamber 14, and a valve port 8 which is fixed to the diaphragm 15 and is separated from and seated on a valve seat member 9 to open and close the valve port 8. It comprises a valve member 17, a lower wall member 18 for fixing the outer peripheral edge of the diaphragm 15 between the upper wall member, and a stopper 19 fixed to the upper wall member 12. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The temperature control element 10 comprises a main body 1 and a valve seat member 9.
Cylindrical mounting member 20 fixed between
The lower wall member 18 is urged downward by a coil spring 21 disposed between the lid member 5 and the upper wall member 12, and the step portion 22 formed on the inner surface of the mounting member 20.
Is held in contact with the lower surface of the outer periphery. Below the step 22 of the mounting member 20, a total of four through holes 23 are provided on both sides of the paper surface and on the front side and the opposite side . The through hole 23 is on the valve seat member 9
The valve seat of the valve seat member 9 is located at almost the same height as the surface of the valve seat.
The opening is almost parallel to the plane. The hole 23 of this, a small throttle channel portion of the passage cross-sectional area than the flow path from the inlet 2 is the upstream side is formed. The through holes 23 need not necessarily be formed evenly, and are not limited to four. The outer diameter of the upper part of the mounting member 20 is
It is formed slightly smaller than the inner diameter of the lid member 5, whereby a minute gap 24 is formed between the outer periphery of the mounting member 20 and the inner peripheral wall of the lid member 5. The passing cross-sectional area of the gap 24 is formed smaller than the passing cross-sectional area of the throttle channel portion by the through hole 23.

The operation of this embodiment is as follows. When the temperature in the valve chamber 4 becomes lower than a predetermined value due to heat radiation, or when low-temperature condensate flows in from the inlet 2, the expansion medium 16 contracts, and the valve member 17 also receives the fluid pressure in the inlet 2 to increase the valve seat. After being separated from the member 9, the valve port 8 is opened, and the low-temperature condensate is discharged from the outlet 3. When the valve member 17 is opened with the valve port 8 opened, the space above the temperature control element 10 becomes a pressure reservoir at the boundary of the gap 24 to form a static pressure region, and the space below the dynamic pressure region due to the flow of condensate. Becomes When the temperature of the condensed water flowing into the valve chamber 4 gradually rises due to the discharge of the low-temperature condensed water, the high-temperature condensed water flows between the valve member 17 and the valve seat member 9 at a low temperature.
Flows faster than water, but the valve member 17
Because of the faster flow between the valve seat members 9, the pressure below the temperature control element 10 is reduced by the
Pressure. Due to this pressure difference, the diaphragm 15 is displaced downward, and the valve member 17 is seated on the valve seat member 9 to close the valve port 8, thereby preventing leakage of steam.

In the above embodiment, a through hole is used as the throttle passage portion. However, if a nozzle member or the like is used, the valve can be closed at a lower temperature.

[0013]

The present invention has the following specific effects. As described above, according to the present invention, the temperature control element is opened by a temperature difference and closed by a pressure difference.
Steam leakage can be completely prevented, saving energy. If the throttle flow path is made smaller, the condensate flow velocity increases, and the valve can be closed at a lower temperature. Conversely, if the restrictor flow path is increased, the condensate flow velocity does not increase so much, so that the temperature is closer to the saturation temperature. Can be closed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steam trap that opens with a temperature difference and closes with a pressure difference according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Valve room 5 Lid member 8 Valve port 9 Valve seat member 10 Temperature control element 12 Upper wall member 15 Diaphragm 16 Expansion medium 17 Valve member 20 Mounting member 21 Coil spring 22 Step 23 Through hole 24 Gap

Claims (1)

(57) [Claims] A valve member having an inlet and an outlet opened therein by casing, an expansion medium housed between a wall member, a diaphragm member, and both members, and a valve member attached to the diaphragm.
Toka and La made temperature controller element disposed in the valve chamber, in which opening a valve port which forms forms a valve seat member attached to the valve chamber side opening end of the outlet by the displacement of the diaphragm due to contraction of the expansion medium, the temperature Control element is housed in the mounting member and mounted
Only the part of the member that is approximately the same height as the valve seat surface of the valve seat member
In addition, the passage cross-section area is smaller than the flow path from the inlet, and the valve seat member
A steam trap which opens with a temperature difference and closes with a pressure difference, characterized in that a throttle flow path portion opened substantially parallel to the valve seat surface is provided.