JPH10176794A - Large capacity steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small but large capacity steam trap to simplify structure without individually arranging a pilot valve and a piston valve. SOLUTION: An inlet 4 and an outlet 7 are formed in trap casings 1 and 2 through a valve port 17. A valve element 20 to open and close a valve port 17 from the outlet 7 side is arranged opposite to the valve port 17, and 6 piston 14 having a pressure receiving area higher than the pressure receiving area of the valve element 20 is coupled to the valve element 20. A pressure chamber 15 comprises the piston 14 and the trap casing 2. A first orifice 16 communicating the pressure chamber 15 with the inlet 4 side and a second orifice 19 communicating the pressure chamber 15, having an opening area larger than that of the first orifice 16, with the outlet 7 side are provided. A pilot float valve 22 to open and close the second orifice 19 according to a pilot float valve 22 to open and close according to a liquid level in the pressure chamber 15 is arranged in the pressure chamber 15.

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 only condensate generated in a steam pipe or a steam-using device, and more particularly to a trap capable of discharging a large amount of condensate. The steam trap must discharge the condensate condensed by the work of steam quickly without stagnation and without leaking the steam.
Further, in a device using a large amount of steam, a large amount of condensate is generated, and this large amount of condensate must be discharged quickly.

[0002]

2. Description of the Related Art Conventionally, a steam trap as disclosed, for example, in Japanese Patent Publication No. 62-6153 has been used. This uses a float valve that rises and falls according to the inflow of condensate water as a pilot valve, and
By connecting a piston valve of relatively large diameter with a piston valve of relatively large diameter,
When condensate flows in and the pilot float valve opens, a large-diameter piston valve opens to discharge a large amount of condensate.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
There was a problem that the structure was complicated and the shape as a trap became large. This is because the pilot valve and the piston valve are arranged independently and separately, so that a passage or the like for communicating each member is required, and the structure becomes complicated and the shape becomes large. When the structure is complicated and the shape becomes large, the probability of occurrence of a failure increases, and the price as a product becomes expensive.

[0004] Therefore, the technical problem of the present invention is to provide a pilot valve and a piston valve without separately arranging them.
An object of the present invention is to obtain a large-capacity steam trap having a simple structure and a small size.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is a trap case.
A piston having a pressure receiving area larger than the pressure receiving area of the valve body, wherein an inlet and an outlet are formed through the valve port by singing, and a valve body that opens and closes the valve port from the outlet side is disposed opposite the valve port. And a pressure chamber formed by a piston and a trap casing, and a first orifice communicating the pressure chamber to the inlet side, and a second orifice having a larger opening area than the first orifice and communicating the pressure chamber to the outlet side. The large capacity steam trap is characterized in that a pilot float valve formed and arranged to open and close the second orifice according to the liquid level of the pressure chamber is disposed in the pressure chamber.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fluid flowing from an inlet is a first fluid.
It reaches the pressure chamber through the orifice. When the inflowing fluid is a liquid, that is, condensate, the pilot float valve disposed in the pressure chamber floats and opens the second orifice to communicate the outlet with the pressure chamber. When the second orifice is opened, the pressure in the pressure chamber decreases, so that the valve body opens the valve port by the fluid pressure from the inlet. Thereby, the condensate from the inlet flows down to the outlet side through the valve port.

[0007] When the fluid from the inlet changes from condensate to gaseous vapor, the pilot float valve descends and closes the second orifice. When the second orifice is closed, the pressure in the pressure chamber increases, and the valve body is driven by the piston to close the valve port. This prevents the steam from flowing down to the outlet side.

According to the present invention, a pilot float valve is disposed in a pressure chamber formed by a piston and a trap casing, and the pilot float valve has an opening area larger than that of a first orifice communicating the inlet and the pressure chamber. The second orifice that largely communicates the pressure chamber with the outlet is opened and closed. Therefore, the structure can be simplified and the shape can be reduced.

[0009]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The cover 2 is fastened to the main body 1 to form a trap casing. The inside of the trap casing is a partition tube 3 formed integrally with the main body 1 and separated into an inlet passage 5 communicating with the inlet 4 and an outlet passage 8 communicating with the valve chamber 6 in the partition tube 3 and the outlet 7. Openings 10, 11, and 12 communicating the inside and outside are provided at the upper end, the bottom, and the lower part of the partition tube 6, respectively.

A cylinder member 13 is disposed in the valve chamber 8, and a piston 14 is disposed in the cylinder member 13 so as to be vertically slidable. A space surrounded by the piston 14, the cylinder member 13, and the lid member 2 forms a pressure chamber 15. Cylinder member 1
3, a first orifice 16 communicating the inlet 4 with the pressure chamber 15 is formed at the upper part, a valve port 17 communicating the inlet 4 with the space below the piston 14 is formed at the bottom, and a lower part of the piston 14 and the outlet 7 are formed. Is formed in the lower part.
A second orifice 19 is formed in the piston member 14 to connect the pressure chamber 15 to the outlet 7 side.

A valve body 20 is provided below the piston 14 with a nut 2
Fix with 1. The valve body 20 opens and closes the valve port 17 from the outlet 7 side. A hollow spherical pilot float valve 22 is disposed in the pressure chamber 15 in a free state. Pilot float valve 22
Rises and falls with the liquid level in the pressure chamber 15 to open and close the second orifice 19. Reference numeral 23 designates a float seat for determining a lowered position of the pilot float valve 22, reference numerals 24 and 25 designate stoppers when the pilot float valve 22 floats, and reference numerals 26 and 27 designate pistons 14 respectively. It is a stopper when rising.

When the amount of condensed water flowing into the pressure chamber 15 from the inlet 4 is small or not, the pilot float valve 22 is lowered to close the second orifice 19. Since the pressure in the pressure chamber 15 approaches the pressure on the inlet 4 side through the first orifice 16, the piston 14 displaces the valve body 20 to a position where the valve port 17 is closed. This prevents the steam from flowing down to the outlet 5.

When a large amount of condensate flows into the pressure chamber 15 from the inlet 4, the pilot float valve 22 floats and opens the second orifice 19. Since the pressure in the pressure chamber 15 approaches the outlet 7 side pressure through the second orifice 19, the valve body 20
Opens the valve port 20 by the pressure on the inlet 4 side, and discharges a large amount of condensed water from the inlet 4 to the outlet 7.

[0014]

The present invention has the following specific effects. As described above, in the present invention, since the pilot float valve is disposed in the pressure chamber partially formed by the piston, the structure can be simplified and the shape can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a large-capacity steam trap according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 4 Inlet 7 Outlet 14 Piston 15 Pressure chamber 16 First orifice 17 Valve port 19 Second orifice 20 Valve body 22 Pilot float valve

Claims (1)

[Claims] An inlet and an outlet are formed through a valve port by trap casing, and a valve element that opens and closes the valve port from an outlet side is disposed opposite to the valve port, and the valve element has a pressure receiving area of the valve element. A first orifice which connects a piston having a large pressure receiving area, a pressure chamber is formed by the piston and trap casing, and the pressure chamber communicates with the inlet side, and an opening area which is larger than the first orifice is connected to the outlet side. A large capacity steam trap, wherein a second orifice communicating with the pressure chamber is formed, and a pilot float valve for opening and closing the second orifice according to the liquid level of the pressure chamber is arranged in the pressure chamber.