JPH07208692A - Thermal actuation type steam trap - Google Patents

Abstract

PURPOSE:To provide a thermal actuation type steam trap capable of minimizing leakage of steam, and quickly discharging a low temperature fluid. CONSTITUTION:A rotary vane 24 which receives torque caused by a discharging fluid, is mounted on the lower wall member 8 of a temperature control machine element 10. The temperature control machine element is suspended in the middle part of a heat sensitive operating member 20, the outer periphery of which is mounted on a mounting member 21, so that the element can freely incline and rotate. Even when a valve member 17 is tilted when it is seated on a valve member 9, the valve member is completely in close contact with the valve seat member 9 to close a valve port 8 perfectly, since the temperature control machine element 10 is tilted throughout the machine element. Since the temperature control machine element is rotated at the time of opening the valve, the rotating position of the valve member in relation to the valve seat member 9 is changed each time the valve member is seated on the valve seat member, and thus partial wear is not generated on the valve member. Further, at low temperatures the temperature actuation member is curved upward protrusively to lift the temperature control machine element to largely separate the valve member from the valve seat member, and thus a large quantity of low temperature fluid is quickly discharged.

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 heat-actuated steam trap using a temperature control element is disclosed in, for example, Japanese Patent Publication No. 60-46318. As can be understood from the publication, an inlet, a valve chamber and an outlet are formed by casing, and two upper and lower wall members are provided,
A temperature control element consisting of a diaphragm having an outer peripheral edge fixed between both wall members, an expansion medium accommodated between the upper wall member and the diaphragm, and a valve member connected to the diaphragm is arranged in the valve chamber to expand. The valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the medium to open and close the valve opening formed at the opening end on the valve chamber side of the outlet.

[0003]

When a high temperature fluid having a temperature 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 valve port. This prevents the discharge of steam. When a low temperature fluid below a predetermined temperature flows in, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, and the valve member opens the valve port. As a result, condensed water and air are discharged outside 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 due to 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 valve opening. 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. Further, repeated seating in this inclined state causes uneven wear of the valve member.

Further, there is a problem that it takes a long time to discharge a large amount of low-temperature fluid accumulated at the time of starting. This is because the valve member opens the valve opening due to contraction of the expansion medium at the time of starting, but the flow path between the valve surface of the valve member and the valve seat surface of the valve opening is narrow.

Therefore, a technical object of the present invention is to make it possible to completely close the valve even when the valve member is seated in a tilted state, and to prevent uneven wear so as to prevent vapor leakage from causing thermal reaction. The purpose is to provide a type steam trap. Another object of the present invention is to provide a heat-actuated steam trap which can enlarge a flow path between a valve member and a valve port to quickly discharge a large amount of low temperature fluid.

[0007]

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 two upper and lower wall members, A temperature control element consisting of a diaphragm having an outer peripheral edge fixed between both wall members, an expansion medium accommodated between the upper wall member and the diaphragm, and a valve member connected to the diaphragm is arranged in the valve chamber to expand. In a thermally responsive steam trap that drives the valve member by the displacement of the diaphragm due to expansion and contraction of the medium to open and close the valve port formed at the opening end on the valve chamber side of the outlet,
A swirl vane that receives rotational force from the discharged fluid is attached to the lower surface of the lower wall member, and a temperature responsive member that pulls up the temperature control element to separate the valve member from the valve opening at low temperature is installed in the valve chamber, and temperature control is performed on the temperature responsive member. The feature is that the element is slanted and rotatably hung.

[0008]

The operation of the above technical means is as follows.
At the time of startup, the temperature inside the valve chamber is low, and the valve member opens the valve opening due to the displacement of the diaphragm in the valve opening direction due to the contraction of the expansion medium. At this time, since the temperature control element is pulled up by the temperature responsive member to separate the valve member from the valve opening, a sufficient discharge flow path can be secured between the valve member and the valve opening.
It is possible to quickly discharge a large amount of low temperature fluid.

When the temperature of the fluid flowing into the valve chamber rises due to the discharge of the low temperature fluid, the temperature responsive member eliminates the action of separating the valve member from the valve opening, so that there is a gap between the valve member and the valve opening. The gap becomes the normal gap. After that, the valve member opens and closes the valve opening by the displacement of the diaphragm due to the expansion and contraction of the expansion medium. Further, since the temperature control element is slanted and rotatably hung down by the temperature responsive member, 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 valve opening, The control element is inclined to the whole,
The valve surface can be displaced in a state parallel to the valve seat surface. As a result, the valve surface can be brought into close contact with the valve seat surface, and the valve can be closed completely.

Further, since the swirl vanes, which receive the rotational force by the discharged fluid, are attached to the lower surface of the lower wall member, the temperature control element rotates when the valve member is closed with the valve opening. Therefore, when the valve is closed, the rotational positional relationship of the valve member with respect to the valve seat surface changes each time the valve is seated, and uneven wear does not occur in the valve member.

[0011]

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 having a valve port 8 that connects the valve chamber 4 and the outlet 3 is screwed to the opening end of the valve chamber 4 side.

The temperature control element 10 located above the valve seat member 9 includes an upper wall member 12 having an injection port 11 and an injection port 1.
A spherical plug member 13 for sealing 1 and a diaphragm 15 forming a storage chamber 14 between the upper wall member 12 and the storage chamber 1
4, the expansion medium 16 sealed in 4, the valve member 17 that is fixed to the diaphragm 15 and is seated on and off the valve seat member 9 to open and close the valve port 8, and the outer peripheral edge of the diaphragm 15 is sandwiched between the upper wall member. The lower wall member 18 is fixed to the upper wall member 12, and the stopper 19 is fixed to the upper wall member 12. The expansion medium 16 is
It is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The disk-shaped temperature responsive member 20 located on the upper wall member 12 is made of bimetal, shape memory alloy, or the like, and is slightly larger than the diameter of the injection port 11 in the center.
It has a hole slightly smaller than the diameter of 3, and is loosely locked by the plug member 13 welded to the inlet 11 so as not to come off. As a result, the temperature control element 10 is tiltably and rotatably connected to the temperature responsive member 20. The temperature responsive member 20 is curved upward when the temperature is low and convex downward when the temperature is high.

The temperature control element 10 and the temperature responsive member 20 are
The upper and lower outer circumferences of the temperature responsive member 20 are housed in a bottomed cylindrical mounting member 21 fixed between the main body 1 and the valve seat member 9, and two upper and lower snap rings are mounted on the mounting member 21. It is held at 22 and 23. The outer diameter of the temperature control element 10 is formed smaller than the inner diameter of the mounting member 21, and a space is provided below between the bottom surface of the mounting member 21 and the upper surface of the valve seat member 9. As a result, the temperature control element 10 is allowed to hang down freely on the temperature responsive member 20. A swirl vane 24 is attached to the lower surface of the lower wall member 18, which allows the temperature control element 10 to rotate freely when the valve is opened. Six swirler blades 24 are attached at equal intervals in this embodiment. A condensate passage window 25 is opened in the lower portion of the attachment member 21. In this embodiment, three are opened at equal intervals.

The operation of this embodiment is as follows. At startup, the temperature inside the valve chamber 4 is low, the expansion medium 16 contracts,
The valve member 17 is also separated from the valve seat member 9 by applying the fluid pressure of the inlet 2 to open the valve port 8. Further, the temperature responsive member 20 is curved upward in a convex shape so that the temperature control element 10 is pulled up, and the valve member 17 is largely separated from the valve seat member 9. This expels a large amount of cold fluid quickly.
When the valve is opened, the temperature control element 10 is rotating because the swirl blade 24 receives a rotational force by the discharged fluid flowing down the lower surface of the lower wall member 18.

When the temperature of the fluid flowing into the valve chamber 4 rises due to the discharge of the low temperature fluid, the temperature responsive member 20 is curved in a downward convex shape as shown in FIG.
Is pushed down to form a normal gap between the valve member 17 and the valve seat member 9. And when the temperature of the fluid becomes higher,
The expansion medium 16 expands, displaces the valve member 17 downward through the diaphragm 15, seats the valve member 17 on the valve seat member 9 and closes the valve port 8 to prevent vapor 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 suspended from the temperature responsive member 20 can be tilted as a whole, so that the valve The member 17 is in complete contact with the valve opening 8 and is completely closed. Further, since the temperature control element 10 rotates when the valve is opened, the valve member 1 with respect to the valve seat member 9 is seated each time the seat is seated.
The rotational positional relationship of 7 is changed, and the valve member 17 is not unevenly worn. When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 16 contracts and the valve member 17 opens the valve port 11 as shown in the figure.

[0017]

The present invention produces the following unique 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, and since uneven wear does not occur in the valve member, steam leakage does not occur for a long period of time, It saves energy. Further, since the flow path between the valve member and the valve port can be enlarged to quickly discharge a large amount of low temperature fluid, it is possible to shorten the start-up time of the steam-using device and increase the operating rate.

[Brief description of drawings]

FIG. 1 is a 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 Valve Port 9 Valve Seat Member 10 Temperature Control Element 11 Injection Port 12 Upper Wall Member 13 Plug Member 15 Diaphragm 16 Expansion Medium 17 Valve Member 18 Lower Wall Member 20 Temperature Responsive Member 21 Mounting member 22, 23 Snap ring 24 Swirling blade

Claims (1)

[Claims] 1. A casing having an inlet, a valve chamber, and an outlet formed by casing, two upper and lower wall members, a diaphragm having an outer peripheral edge fixed between the both wall members, and a housing between the upper wall member and the diaphragm. A temperature control element composed of the expanded 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 caused by the expansion and contraction of the expansion medium to form the outlet at the opening end on the valve chamber side. For opening and closing the valve opening, a swirl vane that receives rotational force from the discharged fluid is attached to the lower surface of the lower wall member, and a temperature responsive member that lifts the temperature control element to separate the valve member from the valve opening at low temperature is installed in the valve chamber. The thermo-responsive steam trap is characterized in that the temperature control element is attached to the temperature responsive member so that the temperature control element can be tilted and rotated freely.