JPS6048680B2 - free float trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam trap that automatically discharges condensate from a steam system and an air trap that automatically discharges condensate from a compressed air system. Concerning expression traps.

In a free float type trap, the float acts as a valve body and directly opens and closes the valve port on its surface.The free float is the only moving part, so the structure is simple and there are fewer failures, and the liquid can be continuously controlled. It is widely used as an efficient trap because it can be discharged at a high rate.

However, in the case of traps for large quantities, it is necessary to make a float with a large wall thickness in consideration of pressure resistance and buoyancy, which is difficult to manufacture and process, and increases the cost, which is a practical drawback. BACKGROUND OF THE INVENTION Accordingly, a free-float type steam trap using a connected float in which a plurality of relatively small floats are connected was developed as shown in Japanese Patent Publication No. 16026/1982.

This involves connecting a plurality of relatively small floats with good pressure resistance to increase the buoyancy as a whole to open and close a large diameter valve opening. Problems to be Solved by the Invention In the case of the above-mentioned prior art, there is a limit to the number of connected floats, and moreover, as the number of connected floats increases, the strength of the free float itself decreases. Since the connecting member reduces buoyancy, there is a limit to how large a number of such methods can be used.

Therefore, the present invention aims to minimize the number of connected floats, make maximum use of the buoyancy of the floats, and obtain a free-float type trap that can open and close a relatively large valve opening.

Means for Solving the Problems The technical means of the present invention taken to achieve the above-mentioned technical problems are as follows: 5. (a) Providing a valve port at the bottom of the condensate storage chamber and arranging a magnet on the ceiling; (b)2
Connecting members include two floats placed one above the other and a rod inserted into a cylinder with flanges facing inward and outward, or a non-stretchable chain or string with both ends tied to a specified length. A connecting member that can transmit tensile force at the limit state of maximum separation when the upper and lower floats approach each other within a distance, and when the upper and lower floats are furthest from each other, the lower float touches the valve port while the upper float reaches near the magnet The lower float also functions as a valve body to open and close the valve port, and the upper float (--) is attracted by a magnet.

Here, the connecting member is one in which the upper and lower floats transmit force in the direction of separation from each other at the farthest position from each other, and is not limited to the following embodiments, but may also be a non-stretchable chain, string, etc. Ru.

action The operation of the above technical means is as follows.

That is, when the water level in the condensate reservoir chamber is low, the lower float closes the valve port. As the water level in the condensate storage chamber rises, the upper float rises accordingly, and when it enters the magnetic field of the magnet, the attraction force of the magnet is added to the buoyancy of the upper and lower floats, pulling the lower float valve upward. Then open the valve and drain the water. At this time, the upper float is attracted to the magnet, and the lower float uses its own buoyancy to compress or bend the connecting member and float sufficiently above the valve port. As drainage progresses and the water level falls, the buoyancy of the float gradually decreases, so when the magnet can no longer support the float, it falls and the lower float blocks the valve opening. EXAMPLE An example in which the present invention is applied to a steam trap will be described (see FIGS. 1 and 2).

FIG. 1 shows the valve in the closed state, and FIG. 2 shows the valve in the open state. The trap housing is made by attaching the lid 2 to the main body 1. An inlet 3, a condensate reservoir chamber 4, and an outlet 7 are formed.

A valve seat 5 with an open valve port 6 is attached to the bottom of the condensate reservoir chamber 4, and is communicated with an outflow port 7. A pair of floats 8a and 8b are arranged inside the condensate reservoir chamber 4. Lower float 8a
The lower connecting member 9-, a is fixed to the upper float 8b, and the upper connecting member 9b is fixed to the upper float 8b. A rod-shaped upper connecting member 9b with a flange at the tip is inserted into the cylindrical lower connecting member 9a, and a snap ring 10 is attached to the open end of the lower connecting member 9a.
Connect floats 8a and 8b. The lower float 8a is disposed facing the valve port 6 so as to open and close the valve port 6 on its surface. The upper float 9b is made of a magnetic attraction member that is attracted by the magnet described below. Ribs 1 are provided on the inner peripheral surface of the condensate reservoir chamber 4 so that the floats 8a and 8b can move up and down without being displaced laterally.
1 is installed protrudingly. Further, a magnet 13 is attached to the lower surface of the lid 2 on the ceiling of the condensate storage chamber 4 through a holding member 12 and a flat plate 14, so that the upper float 8b can be attracted and attracted. A through hole 15 communicating with the inlet 3 is opened in the upper part of the condensate reservoir chamber 4,
The inlet 3 is made to replace the steam inside the condensate storage chamber 4.

Next, the operation of the above embodiment will be explained.

When the water level of condensate in the condensate reservoir chamber 4 is low, the float 8a sits on the valve seat 5 and closes the valve port 6, as shown in FIG.

When condensate flows in from the inlet 3, it accumulates in the condensate reservoir chamber 4 and its water level rises, but since the valve port 6 is relatively wide, the force to keep the valve closed due to the action of fluid pressure is strong. Even if the lower float 8a is buried, the floats 8a and 8b do not float up, and the valve port 6 does not open.

When the condensate further flows in and accumulates, it rises together with the water level of the upper float 8b or the condensate reservoir chamber 4, and enters the magnetic field of the magnet 13.

Then, the upper float 8b floats to a predetermined position, the connecting member 9 is fully extended, and the buoyant force acting on both floats 8a, 8b and the suction force of the magnet 13 create a valve closing force due to the fluid pressure acting on the valve port 6. When it becomes larger than , the floats 8a, 8b
floats away from the valve seat 5 and opens the valve port 6. At this time, the floats 8a and 8b rise instantaneously due to the attraction force of the magnet 13 being inversely proportional to the square of the distance and the sudden weakening of the fluid pressure, and the lower float 8a rises due to the loose connection of the connecting member 9. rises higher by the amount of The valve is then attracted by the magnet 13 and maintained in the open state as shown in FIG. When the condensate is discharged through the valve port 6 to the outlet 7 side, the condensate reservoir chamber 4
The water level will gradually decrease. However, while the magnet 13 attracts the floats 8a, 8b and the connecting member 9, the valve remains open. Then, when the water level of the condensate becomes sufficiently low, the upper float 8b separates from the magnet 13 and falls.
The lower float 8a closes the valve port 6. This operation is repeated to discharge a large amount of condensate.

Effect of the invention The present invention produces the following unique effects.

When the water level in the condensate storage chamber is sufficiently low, the float must fall from the magnet, so the magnetic force of the magnet must be slightly smaller than the gravity of the float and the connecting member. When it rises, it is added to the buoyant force of the float as a valve opening force.

In other words, the gravitational force between the float and the connecting member is greatly reduced to maximize the buoyancy of the float. Therefore, a free float type steam trap is obtained which can open and close a relatively large valve opening and discharge a large amount of condensate. In addition, as mentioned above, the valve opens after a certain amount of condensate accumulates intermittently, and the opening/closing timing can be adjusted by adjusting the strength of the magnetic force of the magnet. Even if the condensate contains a highly viscous oil component that could not be completely discharged by the air trap, it can be completely discharged, and it also has a sufficient function as an air trap.

[Brief explanation of the drawing]

1 and 2 show longitudinal cross-sectional views of embodiments of the present invention. 1: Main body, 2: Lid body, 3: Inlet, 4: Condensate storage chamber, 5
: valve seat, 6: valve port, 7: outflow port, 8a, 8b: upper and lower floats, 9a, 9b: upper and lower connecting members, 10: snap spring, 11: ribs, 12: i holding member, 13: magnet.

Claims (1)

[Claims] 1 A valve port is provided at the bottom of the condensate reservoir chamber, a magnet is placed on the ceiling, and two floats are placed in the condensate reservoir chamber, one above the other, and the lower float is attached to the valve port to open and close the valve port. Facing each other,
The upper float has a magnetic attracting member that attracts the magnet,
A connecting member in which a rod is inserted into a cylinder and has flanges facing inward and outward, or a non-stretchable chain or string, whose ends can be brought into contact and separated within a specified distance, and the maximum separation can be achieved. A connecting member that can transmit tensile force in a limit state, and is a free float type trap in which the upper and lower floats are connected so that when they are farthest from each other, the lower float touches the valve port and the upper float reaches near the magnet. .