JP3341187B2 - Thermo-responsive steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to condensate generated in various steam-using devices and steam pipes by using a temperature control element containing a medium which is heated and cooled by steam and condensate and expands and contracts according to the temperature. The present invention relates to a thermo-responsive steam trap that automatically discharges steam, and more particularly to a thermo-responsive steam trap that can discharge a large amount of condensate.

[0002]

2. Description of the Related Art The basic structure of a thermally responsive steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, a temperature control element in which an expansion medium is sealed in an internal space between the wall member and the diaphragm is disposed in a valve chamber communicating with the inlet, and the diaphragm is displaced by expansion and contraction of the expansion medium. The opening and closing of the lead-out path that connects the valve chamber and the outlet are opened and closed.

When a high-temperature fluid having a predetermined temperature or more flows into the valve chamber, the expansion medium expands, the internal pressure in the internal space increases, and the diaphragm is displaced in the valve closing direction to close the outlet passage. This prevents the discharge of steam. When a low-temperature fluid having a predetermined temperature or less flows, the expansion medium contracts, the internal pressure in the internal space decreases, and the diaphragm is displaced in the valve opening direction to open the outlet passage. As a result, condensate and air are discharged out of the system.

[0004]

However, in such a thermo-responsive steam trap of this type, since only a single outlet passage is opened and closed by a temperature control element, the discharge capacity is small. There was a problem that was not suitable for discharging large quantities of condensate.

[0005] Accordingly, it is an object of the present invention to provide a large-volume heat-responsive steam trap capable of discharging a large amount of condensate.

[0006]

Means for Solving the Problems The technical means of the present invention which has been taken to solve the above technical problems is to provide an inlet by valve casing, a valve chamber communicating with the inlet, first and second valves. Forming an outlet communicating with the valve chamber through the two outlets, and placing a temperature control element filled with an expansion medium in the internal space between the two diaphragms between the two outlets; The displacement of the two diaphragms due to the expansion and contraction of the medium causes
It is characterized by opening and closing two outgoing paths.

[0007]

The operation of the above technical means is as follows.
When a high-temperature fluid of a predetermined temperature or more flows into the valve chamber, 2
The expansion medium enclosed in the internal space between the two diaphragms expands to increase the internal pressure of the internal space, displacing the two diaphragms in the directions of the first and second outlet paths facing each other, and Close the lead-out path. When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows in, the expansion medium contracts and the internal pressure of the internal space decreases, and the two diaphragms open the first outlet passage and the second outlet passage, respectively. As described above, since the two outlet paths are opened and closed by the temperature control element, the discharge capacity can be increased, and a large amount of condensate can be discharged.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The body 1 and the end member 2 are connected by bolts (not shown) to form a valve casing having a valve chamber 3 therein. An inlet 4 is formed in the end member 2 and the main body 1 is formed.
Has an outlet 5 coaxial with the inlet 4. Entrance 4
Communicates with the valve chamber 3 through inflow passages 6 and 7 formed in the main body 1.

In the partition between the valve chamber 3 and the outlet 5, a first valve seat member 9 having a first outlet passage 8 opened and a second valve seat member 11 having a second outlet passage 10 opened coaxially. Screw-connected. The valve chamber 3 communicates with the outlet 5 from the first and second outlet passages 8 and 10 through the outside of the partition wall.

[0010] A temperature control element 12 is arranged between the first valve seat member 9 and the second valve seat member 11, and is held by a spring 13. The temperature control element 12 is composed of two diaphragms 1
The expansion medium 16 is sealed in an inner space formed between the outer peripheral edges of the first and fourth fixing members 4 and 15 and fixed therebetween. The expansion medium 16 includes water,
It is formed of a liquid having a lower boiling point than water, or a mixture thereof. Valve members 17 and 18 for opening and closing the lead-out passages 8 and 10 are fixed to the diaphragms 14 and 15 at the centers thereof, respectively. The wall members 1 each having an opening at the center of the outer peripheral edges of the diaphragms 14 and 15 for opening and closing the valve members 17 and 18.
The outer peripheral edges of 9, 20 are fixed.

When the temperature of the fluid flowing into the valve chamber 3 is high, the expansion medium 16 sealed in the internal space between the diaphragms 14 and 15 expands, and the internal pressure in the internal space increases, and the diaphragm 14 is moved to the second position. The valve member 17 is displaced toward the valve seat 9 side.
And the diaphragm 15 is displaced toward the second valve seat 11, and the valve member 18 is used to close the first outlet passage 8.
Close 0.

When the temperature in the valve chamber 3 decreases due to heat radiation or the temperature of the fluid flowing into the valve chamber 3 is low, the expansion medium 16 contracts, the internal pressure in the internal space decreases, and the diaphragm 14 , 15 move away from the valve seat members 9 and 11, respectively, and the valve members 17 and 18 open the outlet passages 8 and 10, respectively.

[0013]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
Since the two outgoing paths can be opened and closed by the temperature control element,
A large amount of condensate can be discharged, and a heat-responsive steel
Can provide a mechanical trap.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermally responsive steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 End member 3 Valve room 4 Inlet 5 Outlet 8 1st outgoing path 10 2nd outgoing path 12 Temperature control element 14, 15 Diaphragm 16 Expansion medium

Claims (1)

(57) [Claims] An inlet is formed by a valve casing, a valve chamber communicating with the inlet, and an outlet communicating with the valve chamber through first and second lead-out passages, and formed between the two diaphragms. A temperature control element in which an expansion medium is sealed in the internal space is disposed between the two outlet paths, and the two outlet paths are opened and closed by displacement of two diaphragms due to expansion and contraction of the expansion medium. A thermally responsive steam trap characterized by the following.