JPH0979488A - 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: A diaphragm 15 and a valve member 21 are communicated by a universal joint 20. Even though the valve member 21 is inclined when it seats on a valve seat member 8, the valve member 21 is contacted closely with the valve seat member 8 perfectly by the inclining of the valve member 21, and a leading-out passage 7 is blocked perfectly.

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 that forms an inlet, a valve chamber, and an outlet by casing, and includes a wall member, a diaphragm, an expansion medium enclosed between them, 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 enclosed between the expansion medium 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 valve chamber side opening end In the one for opening and closing the lead-out path formed in the above, there is a heat-actuated steam trap characterized in that the diaphragm and the valve member are connected by a universal joint.

[0007]

The operation of the above technical means is as follows.
Since the valve member is connected to the diaphragm by a universal joint, even if the valve surface of the valve member is seated in an inclined state that is not parallel to the valve seat surface of the outlet passage, it is necessary to match the valve seat surface. In that case, the valve can be properly tilted and brought into intimate contact, and the valve can be completely closed.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). Upper case 1 and lower case 2
Are screwed together to form a casing having a valve chamber 3 therein. An inlet 4 is formed in the upper casing 1 and an outlet 5 is formed in the lower casing 2. The inlet 4 and the outlet 5 are formed coaxially. A valve seat member 8 having a lead-out passage 7 that connects the valve chamber 3 and the outlet 5 is screwed to the transverse wall 6 of the lower casing 2.

A temperature control element 10 is located above the valve seat member 8. The temperature control element 10 includes a wall member 12 having an inlet 11, a plug member 13 sealing the inlet 11, and a wall member 1.
A diaphragm 15 that forms a storage chamber 14 between the diaphragm 15 and
The expansion medium 16 sealed in the accommodation chamber 14 and the diaphragm 1
5, the mounting member 18 and the universal joint 20 fixed by welding (at the reference numeral 17), the valve member 21 connected to the universal joint 20, and the outer peripheral edge of the diaphragm 15 between the wall member 12. Fixed wall member 2 that is fixed by being sandwiched
2 and a stopper 23 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 universal joint 20 has a spherical portion formed on the lower surface, and the recess formed on the upper surface of the valve member 21 is rotatably fitted therein. This allows the valve member 21 to tilt in all directions.

The temperature control element 10 is biased toward the valve seat member 8 by a spring 25 attached to the lower casing 2, and the outer periphery of the lower surface of the fixed wall member 22 is formed on the inner periphery of the lower casing 2. The ribs 26 are held by hitting the stepped portions of the ribs 26.

The operation of this embodiment is as follows. When the fluid temperature in the valve chamber 3 becomes lower than a predetermined value due to heat dissipation, or when a low temperature fluid flows into the valve chamber 3 from the inlet 4,
The expansion medium 16 contracts, and the valve member 21 is also separated from the valve seat member 8 by applying the fluid pressure at the inlet 4 to open the outlet passage 7. Thereby, low-temperature condensate and air are discharged from the outlet 5.

When the temperature of the fluid flowing into the valve chamber 3 rises due to the discharge of the low temperature fluid, the expansion medium 16 expands, causing the valve member 21 to be displaced downward through the diaphragm 15 and 21 is seated on the valve seat member 8 to close the outlet passage 7 and prevent vapor from leaking. Even if the valve member 21 is tilted when it is seated on the valve seat member 8 due to the expansion of the expansion medium 16, the valve member 21 is connected to the diaphragm 15 by the universal joint 20, so it should be tilted in all directions. Thus, the valve is brought into close contact with the outlet path 7 and the valve is completely closed.

[0014]

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 sectional view of a thermally responsive steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 1 Upper case 2 Lower case 3 Valve chamber 4 Inlet 5 Outlet 7 Outlet path 8 Valve seat member 10 Temperature control element 12 Wall member 15 Diaphragm 16 Expansion medium 20 Universal joint 21 Valve member

Claims (1)

[Claims] 1. A temperature control element comprising a wall member, a diaphragm, an expansion medium enclosed between the wall member and the diaphragm, and a valve member connected to the diaphragm. The valve is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to open and close the lead-out passage formed at the opening end on the valve chamber side of the outlet, and the diaphragm and valve member are connected by a universal joint. A thermo-responsive steam trap characterized by.