JPH074593A - Thermal actuation type steam trap - Google Patents

Abstract

PURPOSE:To provide a thermal actuation type steam trap capable of opening an outlet path even if fluid pressure on the inlet side is minute. CONSTITUTION:An expansion medium 15 is enclosed between an upper wall member 11 and a first diaphragm 14. A valve member 16 for opening and closing an outlet path 8 of a valve seat member 7 is connected to a second diaphragm 18. The second diaphragm 18 and valve member 16 are formed with a through hole 21 for affording communication between the lower surface of the first diaphragm 4 and outlet path 8. A lower wall member 19 is formed of a bimetal as a temperature responsive member. In minute fluid pressure on the inlet 4 side, i.e., in the low temperature, the lower wall member 19 lifts the second diaphragm 18 and the valve member 16 is separated from the valve seat member 7 to open the outlet path 8.

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 in particular, it is heated and cooled by steam and condensate and expands and contracts according to the temperature. Using the temperature control element containing the medium
The present invention relates to a heat-actuated steam trap that discharges condensate below a predetermined temperature to the outside of the system.

[0002]

2. Description of the Related Art The present applicant has previously proposed a heat-actuated steam trap as Japanese Patent Application No. 3-76781. In this, the outer peripheral edges of the first and second diaphragms are fixed between the upper and lower two dish-shaped wall members, the expansion medium is enclosed in the storage chamber between the upper wall member and the first diaphragm, and the second diaphragm is attached. A temperature control element having a valve member connected to the second diaphragm and a through hole formed in the valve member is disposed in a valve chamber communicating with the inlet, and the expansion and contraction of an expansion medium is used to make the first and second diaphragms. The valve member is driven via the valve seat so that the valve member is seated on and off the valve seat member having a lead-out passage that connects the valve chamber and the outlet.

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 first and second diaphragms in the valve closing direction so that the valve member is seated on the valve seat member and is led out. Close the road. This prevents the discharge of steam. When a low temperature fluid below a certain temperature flows in,
The expansion medium contracts, the first and second diaphragms are displaced in the valve opening direction by the fluid pressure on the inlet side, the valve member separates from the valve seat member, and the outlet passage opens. by this,
Condensate and air are discharged outside the system.

[0004]

However, the heat-actuated steam trap of this type has a problem that the outlet passage cannot be opened when the fluid pressure on the inlet side is a slight pressure. That is, when the temperature in the valve chamber is low, the expansion medium contracts and the chamber containing the expansion medium becomes a negative pressure, and the first diaphragm is displaced in the valve opening direction. However, the second diaphragm cannot be displaced in the valve opening direction because the fluid pressure on the inlet side is a slight pressure, and therefore the valve member cannot be separated from the valve seat member.

Therefore, a technical object of the present invention is to make it possible to open the outlet passage even if the fluid pressure on the inlet side is a slight pressure.

[0006]

The technical means of the present invention taken to solve the above-mentioned technical problem is a valve seat having an inlet, a valve chamber and an outlet formed by a valve casing and having a discharge passage. A member disposed between the valve chamber and the outlet, two upper and lower wall members, first and second diaphragms having an outer peripheral edge fixed between both wall members, and between the upper wall member and the first diaphragm. A temperature control element composed of an enclosed expansion medium and a valve member connected to the second diaphragm is arranged in the valve chamber, and a through hole that connects the surface of the first diaphragm that is not in contact with the expansion medium and the outlet path is formed. (2) A diaphragm and a valve member, wherein the valve member is seated on and off the valve seat member by the displacement of the first and second diaphragms due to expansion and contraction of the expansion medium to open and close the outlet passage, and the lower wall member is a temperature responsive member. Valve seat when the lower wall member is cold. It is characterized in that the deformation from the timber as allowed to unseated.

[0007]

The operation of the above technical means is as follows.
Even if the fluid pressure on the inlet side is low, the lower wall member formed by the temperature responsive member deforms and separates the valve member from the valve seat member when the temperature in the valve chamber is low, so open the outlet path. Is possible.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). In FIG. 1, the upper casing 1 and the lower casing 2 are screwed together to form a valve 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. 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 arranged 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 valve member 16, the annular member 17, and the second diaphragm 18 are formed with a through hole 21 that connects the lower surface of the first diaphragm 14 and the lead-out passage 8. The expansion medium 15 is
It is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. The lower wall member 19 is formed of a bimetal as a temperature responsive member, and when the temperature inside the valve chamber is a low temperature below a predetermined temperature, the lower wall member 19 is deformed into a convex shape as shown in FIG.
8 to lift the valve member 16 away from the valve seat member 7,
When the temperature exceeds a predetermined temperature, it deforms downward as shown in FIG.

The temperature control element 9 is housed in a bottomed cylindrical mounting member 22 which is fixed by being sandwiched between the partition wall 6 and the valve seat member 7, and between the screen 23 and the upper wall member 11. Conical coil spring 24 as an elastic member arranged in
Is urged downward by. The step portion 25 formed on the inner surface of the mounting member 22 has a function of holding the temperature control element 9 at a predetermined position by hitting the outer peripheral lower surface of the lower wall member 19. Two fluid passage windows 26 are formed on both sides of the peripheral wall of the mounting member 22.

When the temperature of the fluid flowing from the inlet 4 into the valve chamber 3 is low, the expansion medium 15 contracts, and as shown in FIG.
The first diaphragm 14 is displaced upward. Further, since the lower wall member 19 made of bimetal is also deformed in a convex shape to lift the second diaphragm 18 to separate the valve member 16 from the valve seat member 7, the fluid pressure on the inlet 4 side is a slight pressure. However, the lead-out path 8 can be opened. Thereby, the cryogenic fluid is 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 lower wall member 19 is deformed in a downward convex shape as shown in FIG. After that, the expansion of the expansion medium 15 causes the first and second diaphragms 14 and 18 to be displaced in the valve closing direction, the valve member 16 is seated on the valve seat member 7 to close the outlet passage 8, and the expansion medium is contracted. Causes the first diaphragm 14 to be displaced in the valve opening direction, and the second diaphragm 18 is displaced in the valve opening direction due to the fluid pressure on the inlet 4 side that has increased as the temperature rises.
Separates from the valve seat member 7 and opens the lead-out path 8.

[0013]

The present invention produces the following unique effects. As described above, according to the present invention, by forming the lower wall member by the temperature responsive member, it is possible to open the outlet passage even if the fluid pressure on the inlet side is a slight pressure. The low temperature fluid can be discharged in a short time.

[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 lower wall 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 through hole

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 including first and second diaphragms having an outer peripheral edge fixed therebetween, an expansion medium enclosed between the upper wall member and the first diaphragm, and a valve member connected to the second diaphragm is valved. A through hole that is arranged in the chamber and connects the surface of the first diaphragm that is not in contact with the expansion medium with the outlet path is formed in the second diaphragm and the valve member, and the first and second diaphragms are displaced by the expansion and contraction of the expansion medium. In a case where a valve member is seated on a valve seat member to open and close a lead-out path, a lower wall member is formed by a temperature responsive member, and the lower wall member is deformed so as to separate the valve member from the valve seat member at low temperature. A heat-actuated steam trap characterized by Pu.