JPH0727292A - Heat-response type steam trap - Google Patents

Abstract

PURPOSE:To provide a heat-response type steam trap which can rapidly discharge a large amount of fluid of low temperature in the starting operation. CONSTITUTION:In the device where an outer circumferential edge of a first and second diaphragms 14, 18 are fixed between an upper and lower wall members 11, 19, the expansion medium 15 is enclosed in a storing chamber 13 between the upper wall member 11 and the first diaphragm 14, and a temperature control element 9 connecting a valve member 16 to the second diaphragm 18 is arranged in a valve chamber 3 communicating with an inlet 4, the temperature control element 9 is pulled up by the contraction of a temperature responding member 22 formed of the shape memory alloy at the low temperature to increase the clearance between a valve member 16 and a valve seat member 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, it is heated and cooled by steam and condensate and expands according to its temperature. 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 containing a contracting medium.

[0002]

2. Description of the Related Art The basic structure of a heat-actuated steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, the outer peripheral edge of the diaphragm is fixed between the upper and lower dish-shaped wall members, the expansion medium is enclosed in the internal space between the upper wall member and the diaphragm, and the valve member is connected to the diaphragm. The temperature control element is placed in the valve chamber that communicates with the inlet, and the expansion / contraction of the expansion medium is used to drive the valve member through the diaphragm, and thereby the discharge path that communicates the valve chamber with the outlet. The valve seat member having the above-mentioned structure allows the valve member to be seated on and off.

When a high temperature fluid having a temperature higher than a predetermined temperature flows into the valve chamber, the expansion medium expands to displace the diaphragm in the valve closing direction so that the valve member is seated on the valve seat member and the outlet passage is closed. This prevents the discharge of steam. When a low-temperature fluid below a predetermined temperature flows in, the expansion medium contracts, the fluid pressure in the valve chamber causes the diaphragm to be displaced in the valve opening direction, the valve member separates from the valve seat member, and the lead-out path is opened. . As a result, condensed water and air are discharged outside the system.

[0004]

However, in the heat-actuated steam trap of this type, there is a problem that it takes time to discharge a large amount of low temperature fluid accumulated at the time of starting. This is because the expansion medium contracts at startup and the valve member separates from the valve seat member to open the lead-out path.However, since the gap between the valve member and the valve seat member is narrow, a large amount of low temperature fluid is present. This is because it takes time to discharge.

Therefore, a technical object of the present invention is to obtain a thermally actuated steam trap capable of quickly discharging a large amount of low-temperature fluid by increasing the clearance between the valve member and the valve seat member at the time of starting.

[0006]

The technical means of the present invention taken to solve the above technical problems is a valve seat having an outlet, a valve casing forming an inlet, a valve chamber and an outlet. A member disposed between the valve chamber and the outlet, two upper and lower wall members, a diaphragm whose outer peripheral edge is fixed between the two wall members, an expansion medium enclosed between the upper wall member and the diaphragm, and a diaphragm A temperature control element consisting of a valve member connected to the valve is placed in the valve chamber, and the valve member is seated on and off the valve seat member by the displacement of the diaphragm due to expansion and contraction of the expansion medium to open and close the outlet path. It is characterized in that a temperature responsive member for holding the element at a fixed position in the valve chamber at a high temperature and separating it from the valve seat member at a low temperature is provided.

[0007]

The operation of the above technical means is as follows.
At start-up, the temperature inside the valve chamber is low, the expansion medium contracts, and the valve member separates from the valve seat member to open the outlet passage. At this time, the temperature responsive member separates the temperature control element from the valve seat member. As a result, a sufficient discharge flow path can be secured between the valve member and the valve seat member, and a large amount of low temperature fluid can be quickly discharged. When the temperature of the inflow fluid increases due to the discharge of the low temperature fluid, the temperature responsive member holds the temperature control element in a fixed position in the valve chamber, and the clearance between the valve member and the valve seat member becomes a normal clearance. After that, similarly to the conventional case, the valve member is seated on and off the valve seat member through the diaphragm by the expansion and contraction of the expansion medium, and the outlet path is opened and closed.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). In FIG. 1, the upper casing 1 and the lower casing 2 are screwed to each other, and the valve chamber 3 is provided inside.
A valve casing is formed having An inlet 4 is formed in the upper casing 1 and an outlet 5 is formed in the lower casing 2. A valve seat member 7 is screwed to a partition wall 6 between the valve chamber 3 and the outlet 5. At the center of the valve seat member 7, a penetrating passage 8 that connects the valve chamber 3 and the outlet 5 is formed.

A temperature control element 9 is located above the valve seat member 7. The temperature control element 9 includes an upper wall member 11 having an injection port 10, a plug member 12 that seals the injection port 10, a first diaphragm 14 that forms a storage chamber 13 between the upper wall member 11, and a housing. The expansion medium 15 sealed in the chamber 13, the valve member 16 that is seated on and off the valve seat member 7 to open and close the lead-out path 8, the second diaphragm 18 that fixes the valve member 16 together with the annular member 17, and the first and first (2) Lower wall member 19 that holds the outer peripheral edges of the diaphragms 14 and 18 between the upper wall member 11 and the outer peripheral edges and fixes them
And a stopper 20 fixed to the upper wall member 11. The expansion medium 15 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The temperature control element 9 is housed in a bottomed cylindrical mounting member 21 which is fixed by being sandwiched between the partition wall 6 and the valve seat member 7. Both ends of the mounting member 21 and the upper wall member 11 are It is held by a temperature responsive member 22 formed in a coil shape from a fixed shape memory alloy. A screen 23 is arranged between the upper end surface of the mounting member 21 and the upper casing 1. The temperature responsive member 22 contracts at a low temperature as shown in FIG. 1 to pull up the temperature control element 9 to increase the gap between the valve member 16 and the valve seat member 7, and at a high temperature as shown in FIG. By extending and pushing down the temperature control element 9, the outer peripheral lower surface of the lower wall member 19 is applied to and held by the step portion 24 formed on the inner surface of the mounting member 21, and between the valve member 16 and the valve seat member 7. Make the gap a normal gap. Two fluid passage windows 25 are formed on both sides of the peripheral wall of the mounting member 21.

At the time of start-up, the temperature inside the valve chamber 3 is low, the expansion medium 15 contracts, and the second diaphragm 18 as shown in FIG.
Is lifted by the fluid pressure in the valve chamber 3, and the valve member 16
Separates from the valve seat member 7 and opens the lead-out path 8. Further, the contraction of the temperature responsive member 22 pulls up the temperature control element 9 and the valve member 16 is largely separated from the valve seat member 7, so that a large amount of low temperature fluid is quickly discharged.

When the temperature of the fluid flowing into the valve chamber 3 rises due to the discharge of the low temperature fluid, the temperature responsive member 2
By the extension of 2, the temperature control element 9 is pushed down, and the gap between the valve member 16 and the valve seat member 7 becomes a normal gap. Then, thereafter, the valve member 16 is seated on and off the valve seat member 7 by the expansion and contraction of the expansion medium 15, and the outlet passage 8 is opened and closed.

[0013]

The present invention produces the following unique effects. As described above, the heat-actuated steam trap according to the present invention is
Since a large amount of low-temperature fluid can be quickly discharged at the time of start-up, it is possible to shorten the startup time of steam-using equipment and increase the operating rate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an operating state of a heat-actuated steam trap according to an embodiment of the present invention at a low temperature.

FIG. 2 is a cross-sectional view showing a state in which the temperature responsive member is deformed from the state of FIG.

[Explanation of symbols]

 3 valve chamber 4 inlet 5 outlet 7 valve seat member 8 outlet path 9 temperature control element 11 upper wall member 14 first diaphragm 15 expansion medium 16 valve member 18 second diaphragm 19 lower wall member 21 mounting member 22 temperature responsive member 24 steps Department

Claims (1)

[Claims] 1. A valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet. A temperature control element consisting of a diaphragm having an outer peripheral edge fixed between it, an expansion medium enclosed between the upper wall member and the diaphragm, and a valve member connected to the diaphragm is placed in the valve chamber to expand and contract the expansion medium. In which the valve member is seated on and off the valve seat member by the displacement of the diaphragm due to
A thermally responsive steam trap, comprising a temperature responsive member for holding the temperature control element at a fixed position in the valve chamber at a high temperature and separating it from the valve seat member at a low temperature.