JPH0979490A - Thermal reaction type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal reaction type steam trap which can block perfectly even when a valve member seats on a valve seat member in an inclined condition. SOLUTION: An inlet 2, a valve chest 4, and an outlet 3 are formed of a casing which consists of a main body 1 and a lid member 5, and the valve chest 4 and the outlet 3 are communicated by a leading-out passage 8 opened to a valve seat member 9. In an installing member 20 locked loosely inclinable between the main body 1 and the valve seat member 9, a temperature control element 10 which consists of a wall member 12, a diaphragm 15, an expansion medium 16 housed between the above two members, and a valve member 17, is provided. This installing member 20 has three return water passing windows 21 on the peripheral wall at the same intervals, and small diameter steps are provided at both sides of each return water passing window 21. The temperature control element 10 is energized downward by an elastic member 22 which is held by the upper ends of the return water passing windows 21, and it is held by abutting the lower surface of the outer periphery of the fixing wall member 12 to the steps of the installing member 20.

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 particularly to a temperature including a medium which is expanded when heated and contracted when cooled. The present invention relates to a heat-actuated steam trap that uses a control element to discharge fluid below a desired temperature to the outside of the system.

[0002]

2. Description of the Related Art A thermally responsive steam trap using a temperature control element is disclosed, for example, in Japanese Patent Publication No. 60-46318. As can be understood from the publication, a temperature control element is formed by a casing that forms an inlet, a valve chamber, and an outlet, and includes a wall member, a diaphragm, an expansion medium housed between the wall member and the diaphragm, and a valve member connected to the diaphragm. Is disposed in the valve chamber, and the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to open and close the outlet passage formed at the opening end of the outlet on the valve chamber side.

[0003]

When a high-temperature fluid having a temperature equal to or higher than a predetermined temperature flows into the valve chamber, the expansion medium expands, the diaphragm is displaced in the valve closing direction, and the valve member closes the outlet passage. This prevents the discharge of steam. When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, and the valve member opens the outlet passage. As a result, condensate and air are discharged out of the system.

However, the heat-actuated steam trap of this type has a problem that the valve cannot be completely closed to cause vapor leakage. This is because when the diaphragm is displaced in the valve closing direction by the expansion of the expansion medium, the valve surface of the valve member may approach and seat in an inclined state that is not parallel to the valve seat surface of the outlet passage. This is because, when the seat is seated in a tilted state, it may not be possible to shift to a state parallel to the valve seat surface and complete contact may not be achieved with the valve seat surface.

Therefore, the technical problem of the present invention is to provide a thermally actuated type steam valve which can be completely closed even if the valve member is seated in a tilted state.
It is to provide a mutrap.

[0006]

The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber and an outlet by casing, and to form a wall member, a diaphragm and both of them. A temperature control element composed of an expansion medium housed in between and a valve member connected to the diaphragm is arranged in the valve chamber, and the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to open the outlet end on the valve chamber side. In the one for opening and closing the lead-out passage formed in (1), there is provided a heat-acting steam trap characterized in that a mounting member is tiltably arranged in a valve chamber, and a temperature control element is arranged in the mounting member.

[0007]

The operation of the above technical means is as follows.
Since the mounting member is tiltably arranged in the valve chamber and the temperature control element is arranged in the mounting member, the temperature control element can be tilted as a whole together with the mounting member. Therefore, even if the valve surface of the valve member is seated in a state in which the valve surface is not parallel to the valve seat surface of the discharge path, the temperature control element tilts with the mounting member as a whole, and the valve member sticks to the discharge path. Completely close.

[0008]

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. A casing is constituted by the main body 1 and the lid member 5, and the airtightness between them is an annular gasket 6.
Kept in. 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. Exit 3
A valve seat member 9 in which a lead-out path 8 that connects the valve chamber 4 and the outlet 3 is formed is screwed to the opening end of the valve chamber 4 side.

A temperature control element 10 is located above the valve seat member 9. The temperature control element 10 includes a wall member 12 having an inlet 11, a plug member 13 for sealing the inlet 11, and a diaphragm 15 for forming a storage chamber 14 between the wall member 12.
An expansion medium 16 sealed in the housing chamber 14, a valve member 17 fixed to the diaphragm 15, and a fixed wall member 18 fixed by sandwiching the outer peripheral edge of the diaphragm 15 with the upper wall member.
Consisting of The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The mounting member 20 is loosely locked between the main body 1 and the valve seat member 9 so as to be tiltable, and the temperature control element 10 is arranged in the mounting member 20. The attachment member 20 has three condensate passage windows 21 formed at equal intervals on the peripheral wall thereof, and each of the condensate passage windows 2 is
A small-diameter step portion is formed on both sides of 1. The temperature control element 10 is urged downward by the elastic member 22 held at the upper end of each condensate passage window 21, and the stepped portion of the attachment member 20 is held by the outer peripheral lower surface of the fixed wall member 10 hitting. There is.

The operation of this embodiment is as follows. When a high-temperature fluid flows into the valve chamber 4 from the inlet 2, 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 and the discharge passage is formed. 8 is closed to prevent steam leakage. Even if the valve member 17 is tilted when it is seated on the valve seat member 9 due to the expansion of the expansion medium 16, the temperature control element 10 is tilted as a whole together with the mounting member 20, so that the valve member 17 is guided to the outlet passage 8. Closely close with close contact. On the other hand, when the fluid temperature becomes lower than a predetermined value due to heat radiation or when a low temperature fluid flows in from the inlet 2, the expansion medium 16 contracts and the valve member 17
Is also moved away from the valve seat member 9 under the influence of the fluid pressure at the inlet 2 to open the outlet passage 8, and the low temperature condensate and air are discharged from the outlet 3.

[0012]

The present invention has the following specific effects. As described above, according to the present invention, even if the valve member is seated in a tilted state, the valve can be completely closed, so that vapor leakage does not occur and energy saving is achieved.

[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 11 Inlet Port 12 Wall Member 13 Plug Member 15 Diaphragm 16 Expansion Medium 17 Valve Member 20 Mounting Member 22 Elastic Member

Claims (1)

[Claims] 1. A temperature control element comprising a wall member, a diaphragm, an expansion medium contained between the wall member and the diaphragm, and a valve member connected to the diaphragm. When the valve member is driven by the displacement of the diaphragm caused by the expansion and contraction of the expansion medium to open and close the lead-out passage formed at the opening end of the outlet on the valve chamber side, the mounting member is arranged inclinable in the valve chamber and mounted. A thermo-responsive steam trap characterized in that a temperature control element is arranged inside the member.