JPH07158795A - Thermo-actuating type steam trap - Google Patents

Abstract

PURPOSE:To provide a thermo-actuating type steam trap in which the oscillation of a temperature control element is prevented, causing no breakage or steam leak. CONSTITUTION:A lid member 5 is mounted on a body 1 having an inlet port 2 and an outlet port 3 formed therein to form a valve chamber 4 having opened inlet port and outlet port in the inside. A temperature control element 10 consisting of an upper wall member 12, a diaphragm 15, and a expanding medium 16 housed between the both is housed in a bottomed cylindrical mounting member 20 nipped and fixed between the body and a valve seal member 9. The outer diameter in the upper part of the mounting member is set slightly smaller than the bore diameter of the lid member, and the outer diameter of the temperature control element is set slightly smaller than the bore diameter of the upper part of the mounting member, whereby a fine clearance 23 is formed between the outer circumference of the temperature control element and the inner circumferential wall of the lid member.

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 devices and steam pipes, and more particularly, it is expanded by heating with steam and contracted by cooling with condensate. The present invention relates to a heat-actuated steam trap that discharges condensed water below a desired temperature to the outside of a system by using a temperature control element including a medium.

[0002]

2. Description of the Related Art A heat-acting steam trap using a temperature control element is disclosed in, for example, Japanese Patent Publication No. 1-30808. As understood from the publication, a cover member is attached to a main body having an inlet and an outlet to form a valve chamber in which the inlet and the outlet are opened, and an expansion accommodated between the wall member, the diaphragm member and both members. A temperature control element composed of a medium is arranged in the valve chamber, and the valve chamber side opening end of the outlet is opened and closed by the displacement of the diaphragm caused by the expansion and contraction of the expansion medium.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
When the temperature control element is opened, it violently sways due to discharged condensate flowing from the inlet to the outlet, colliding with the inner wall of the valve chamber and damaging it, or tilting in a direction not parallel to the opening end of the outlet on the valve chamber side. When the valve is subsequently closed, the valve cannot be completely closed, resulting in a steam leak.

Therefore, a technical problem of the present invention is to provide a heat-actuated steam trap which prevents the temperature control element from swaying and is free from damage or steam leakage.

[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 temperature control element, which forms a valve chamber and is composed of a wall member, a diaphragm member, and an expansion medium housed between both members, is disposed in the valve chamber, and the valve chamber at the outlet is caused by displacement of the diaphragm due to expansion and contraction of the expansion medium. A feature of opening and closing the side opening end is that a minute gap is formed between the outer periphery of the temperature control element and the inner peripheral wall of the lid member.

[0006]

The operation of the above technical means is as follows.
Since a minute gap is formed between the outer circumference of the temperature control element and the inner peripheral wall of the lid member, when the temperature control element is opened, the opening on the side opposite to the opening on the valve chamber side of the outlet is separated by the gap. The valve chamber space becomes a static pressure region and becomes a static pressure region, while the valve chamber space on the side where the outlet is open becomes a dynamic pressure region due to the condensate flow, and the pressure corresponding to the velocity decreases. Due to the pressure difference between the static pressure region (inlet pressure) and the dynamic pressure region (pressure lower than the inlet pressure) formed at the boundary, the temperature control element is pressed and fixed at a predetermined position in the valve chamber and sways. Is completely prevented.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the main body 1 on the same axis, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is fastened to the main body 1 by a bolt (not shown).
Formed by. Airtightness between the main body 1 and the lid member 5 is maintained by an annular gasket 6. A screen 7 is provided on the passage extending from the inlet 2 to the valve chamber 4 to trap foreign matter such as dust. A valve seat member 9 having a through passage 8 that connects the valve chamber 4 and the outlet 3 is screwed to the opening end of the outlet 3 on the valve chamber 4 side.

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 injection port 11, a plug member 13 for sealing the injection port 11,
A diaphragm 15 that forms a storage chamber 14 between the upper wall member 12, an expansion medium 16 that is sealed in the storage chamber 14, and a valve seat member 9 that is fixedly attached to the diaphragm 15 to open and close the outlet passage 8. A valve member 17 and a lower wall member 18 that is fixed by sandwiching the outer peripheral edge of the diaphragm 15 with the upper wall member,
It comprises a stopper 19 fixed to the upper wall member 12.
The expansion medium 16 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The temperature control element 10 includes a main body 1 and a valve seat member 9
A bottomed cylindrical mounting member 20 fixed by being sandwiched between
The lower wall member 18 is housed inside and is urged downward by a coil spring 21 arranged between the lid member 5 and the upper wall member 12 to form a step portion 22 formed on the inner surface of the mounting member 20.
The lower surface of the outer periphery is held in contact. The outer diameter of the upper portion of the mounting member 20 is formed to be slightly smaller than the inner diameter of the lid member 5,
Further, the outer diameter of the temperature control element 10 is formed to be slightly smaller than the inner diameter of the upper portion of the mounting member 20, so that a minute gap 23 between the outer circumference of the temperature control element 10 and the inner peripheral wall of the lid member 5 is formed. Is formed. Two condensate passage windows 24 are formed on both sides of the lower portion of the mounting member 20.

The operation of this embodiment is as follows. When the fluid flowing from the inlet 2 into the valve chamber 4 is high-temperature steam, the expansion medium 16 expands and displaces the valve member 17 downward through the diaphragm 15, so that the valve member 17 is seated on the valve seat member 9. The lead-out path 8 is closed to prevent the steam from leaking. On the other hand, when the fluid temperature becomes lower than a predetermined value due to heat dissipation, or when low-temperature condensate flows in from the inlet 2, the expansion medium 16 contracts and the valve member 17 also applies the fluid pressure at the inlet 2 to the valve seat member 9 To open the lead-out path 11
Condensate is discharged from outlet 3.

Since a minute gap 23 is formed between the outer periphery of the temperature control element 10 and the inner peripheral wall of the lid member 5, when the valve member 17 opens the lead-out passage 8, the gap 23 serves as a boundary. In addition, the upper space of the temperature control element 10 serves as a pressure reservoir and serves as a static pressure region, and the lower space serves as a dynamic pressure region due to the flow of condensed water, and the pressure corresponding to the velocity decreases. The temperature control element 10 is pushed downward by the pressure difference between the upper static pressure region, which is the pressure at the inlet 2, and the lower dynamic pressure region, which is lower than the pressure at the inlet 2, and the stepped portion of the mounting member 20. It is press-fitted and fixed to 22 and completely prevented from shaking.

[0012]

The present invention produces the following unique effects. As described above, according to the present invention, the temperature control element is pressure-contacted and fixed at a predetermined position due to the pressure difference between the dynamic pressure region and the static pressure region formed in the valve chamber, so that the shaking is completely prevented. It is possible to perform extremely stable and quiet operation without causing damage or steam leakage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat-actuated steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 1 Main Body 2 Inlet 3 Outlet 4 Valve Chamber 5 Lid Member 8 Outlet Path 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 Gap 24 Condensate Passing window

Claims (1)

[Claims] A lid member is attached to a main body having an inlet and an outlet to form a valve chamber in which an inlet and an outlet are opened, and a wall member, a diaphragm member, and an expansion medium contained between the members. Between the outer periphery of the temperature control element and the inner peripheral wall of the lid member, in which the temperature control element is arranged in the valve chamber and the opening / closing end of the valve chamber side of the outlet is opened / closed by the displacement of the diaphragm caused by the expansion / contraction of the expansion medium. A thermo-responsive steam trap characterized by forming a minute gap in the inside.