JP2001295992A - Thermally-actuated steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermally-actuated steam trap capable of quickly discharging a great amount of low-pressure condensed water. SOLUTION: Covers 4, 5 are tightened to a body 3 having an inlet 1 and an outlet 2 to form a casing, and a valve chest 6 and a valve seat storage chamber 7 are formed between the body 3 and the cover 4 and between the body 3 and the cover 5, respectively. The valve chest 6 and the valve seat storage chamber 7 are communicated with each other via an opening 10 having a large passage area. A valve seat 15 having a valve hole 13 communicating between the valve chest 6 and an outflow passage 12 is arranged in the valve seat storage chamber 7 so as to be movable forward and backward. An inlet chamber 16 communicating from the inlet 4 via a communication passage 9 is formed on the back of the valve seat 15, and spring 17 is arranged in the inlet chamber 16. The spring 17 operates valve opening force for the valve seat 15 to open the opening 10 having the large passage area. The valve seat 15 opens the opening 10 having the large passage area during a low pressure and closes the opening 10 during a high pressure. A thermally-actuated element 19 is arranged in the valve chest 6. The thermally-actuated element 19 opens/closes the valve hole 13 during a high pressure when the valve seat 15 closes the opening 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-responsive steam trap which automatically discharges condensate generated in various steam-using equipment and steam piping by opening and closing a valve hole using a heat-responsive element. In particular, it relates to one having a large condensate discharge capacity.

[0002]

2. Description of the Related Art A thermally responsive steam trap using a thermally responsive element is disclosed, for example, in JP-A-8-28787. As understood from the publication, a valve chamber is formed in a casing having an inlet and an outlet, a valve seat having a valve hole communicating the valve chamber and the outlet is provided, and a thermally responsive element that opens and closes the valve hole is provided by a valve. It is arranged indoors.

[0003]

In the above-described conventional thermo-responsive steam trap, a thermo-responsive element disposed in a valve chamber opens and closes a valve hole by a heat-sensitive action. That is, when the temperature in the valve chamber rises, the thermally responsive element is seated on the valve seat to close the valve hole, thereby preventing leakage of steam. When the temperature in the valve chamber decreases, the thermally responsive element separates from the valve seat, opens a valve hole, and discharges condensate. However, in a thermoresponsive steam trap of this type, the passage area of the valve hole that can be opened and closed by the thermoresponsive element is limited. When the pressure is low and a large amount of condensate is generated, there is a problem that it takes time to discharge the condensate.

Accordingly, it is an object of the present invention to provide a thermoresponsive steam trap capable of quickly discharging a large amount of low-pressure condensate.

[0005]

Means for Solving the Problems In order to solve the above technical problems, the technical means of the present invention is to form a valve chamber in a casing having an inlet and an outlet, and to communicate the valve chamber with the outlet. An opening having a large passage area is provided, and a valve seat is disposed so as to be displaceable facing the opening so as to open at a low pressure and close at a high pressure by a valve closing force by a fluid pressure on the inlet side and a valve opening force by a spring. A valve hole communicating with the outlet is provided in the valve seat,
A thermally responsive steam trap is characterized in that a thermally responsive element for opening and closing a valve hole is arranged in a valve chamber.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the heat-responsive steam trap of the present invention, when the fluid pressure on the inlet side is low, the valve opening force by the spring overcomes the valve closing force due to the fluid pressure on the inlet side, and the valve seat is closed. An opening with a large passage area is open. Thereby, a large amount of low-pressure condensate is quickly discharged from the opening having a large passage area. When the fluid pressure on the inlet side is high, the valve closing force due to the fluid pressure on the inlet side overcomes the valve opening force by the spring, the valve seat closes the opening with a large passage area, and the heat responsive element arranged in the valve chamber is The valve hole is opened and closed by the heat-sensitive action. As described above, since the condensate is discharged from the opening having a large passage area at the time of low pressure, a large amount of low-pressure condensate can be quickly discharged.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). Lids 4 and 5 are fastened to a main body 3 having an inlet 1 and an outlet 2 to form a casing.
A valve chamber 6 is formed between the main body 3 and the lid 5, and a valve seat housing chamber 7 is formed between the main body 3 and the lid 5. The inlet 1 and the valve chamber 6 communicate with each other through an inlet passage 8,
The inlet 1 and the valve seat accommodating chamber 7 communicate with each other through a communication passage 9, the valve chamber 6 and the valve seat accommodating chamber 7 communicate with each other through an opening 10 having a large passage area, and the valve seat accommodating chamber 7 and the outlet 2 flow out. It communicates through the passage 12.

A valve seat 15 provided with a valve hole 13 for communicating the valve chamber 6 with the outflow passage 12 is disposed in the valve seat accommodating chamber 7 so as to be able to advance and retreat. An inlet chamber 16 communicating with the inlet 4 via the communication passage 9 is formed on the back surface of the valve seat 15, and a spring 17 is disposed in the inlet chamber 16. The spring 17 has both sides connected to the valve seat 15 and the lid 5 respectively, and the valve seat 15 acts as a valve opening force for opening the opening 10.
The valve seat 15 is displaced toward the lid 5 at low pressure to open the opening 10,
At high pressure, the opening 10 is closed by being displaced toward the valve chamber 6.

A thermoresponsive element 19 is arranged in the valve chamber 6. The thermally responsive element 19 includes an upper wall member 20, a diaphragm 22 forming an internal space 21 between the upper wall member 20, an expansion medium 23 sealed in the internal space 21, and a valve member 24 fixed to the diaphragm 22. It comprises a lower wall member 25 fixedly sandwiching the outer peripheral edge of the diaphragm 22 between the upper wall member 20 and a spring 26 for urging the upper wall member 20 downward. The expansion medium 23 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The thermoresponsive element 19 opens and closes the valve hole 13 when the valve seat 15 closes the opening 10 at a high pressure. The valve chamber 6 communicates with the outlet 2 from the opening 10 having a large passage area through the outflow passage 12 at low pressure, and from the valve hole 13 opened at high pressure through the outlet passage 1.
2 to outlet 2.

The operation of the thermally responsive steam trap of the above embodiment is as follows. When the fluid pressure on the inlet 1 side is low, the valve opening force by the spring 17 overcomes the valve closing force by the fluid pressure on the inlet 1 side, displacing the valve seat 15 to the lid 5 side, and the opening 10 having a large passage area. Is open. As a result, a large amount of low-pressure condensate is quickly discharged from the opening 10 having a large passage area to the outlet 2.

When the fluid pressure on the inlet 1 side is high,
The valve closing force due to the fluid pressure on the inlet 1 side overcomes the valve opening force by the spring 17 to displace the valve seat 15 toward the valve chamber 6, close the opening 10 having a large passage area, and place the heat responsive element disposed in the valve chamber 3. The element 19 closes the valve hole 13 when the temperature in the valve chamber 3 increases due to its heat-sensitive action, and opens the valve hole 13 when the temperature decreases. As a result, the condensate is opened from the valve hole 13 to the outlet
To be discharged. As described above, at low pressure, the condensate is discharged from the opening 10 having a large passage area, so that a large amount of low-pressure condensate can be discharged quickly.

[0013]

As described above, according to the present invention, when the fluid pressure on the inlet side is low, the valve opening force by the spring overcomes the valve closing force by the fluid pressure on the inlet side, and the valve seat has a large passage area. Since the opening is opened, an excellent effect that a large amount of low-pressure condensate can be quickly discharged from the opening having a large passage area is obtained.

[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 Inlet 2 Outlet 3 Main body 4 Lid 5 Lid 6 Valve room 7 Valve seat accommodation room 8 Inlet passage 9 Communication passage 10 Opening 12 Outflow passage 13 Valve hole 15 Valve seat 16 Inlet room 17 Spring 19 Thermal response element

Claims (1)

[Claims] 1. A valve chamber is formed in a casing having an inlet and an outlet, an opening having a large passage area communicating the valve chamber and the outlet is provided, and a valve closing force by a fluid pressure on an inlet side and a valve opening force by a spring. A valve seat is disposed so as to be displaceable facing the opening so that the opening is opened at low pressure and closed at high pressure. A thermo-responsive steam trap characterized by being placed in