JPH08285188A - Float type trap - Google Patents

Abstract

PURPOSE: To provide a float type trap which can discharge a large quantity of condensed water staying at starting time in a short time. CONSTITUTION: A valve casing is formed of a main body 1 and a bottom cover 2. An inlet 4, a valve chamber 3 and an outlet 5 are formed in the valve casing. A large diameter main valve port 6 to communicate the valve chamber with the outlet is formed in a valve chamber bottom part. A main float 7 to open and close the main valve port is guided in the vertical direction by ribs 10, and is arranged in the valve chamber. A vertically penetrating small diameter sub-valve port 8 is formed in the main float. A sub-float 9 to open and close a sub-valve port is guided in the vertical direction by the ribs 10, and is arranged in the valve chamber above the main float. The main valve port is formed in the size capable of opening and closing the main float by one's own effort when a pressure difference between the inlet and the outlet is small. The sub-valve port is formed in the size capable of opening and closing the sub-float by one's own effort even when a pressure difference between the inlet and the outlet is large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float type trap which automatically opens and closes a valve opening by utilizing the floating and descending of a float to automatically discharge condensate generated in a steam or compressed air piping system. ,
In particular, it relates to one having a function of discharging a large amount of condensed water accumulated at the time of starting in a short time. For traps that automatically discharge condensate, a small amount of condensate is generated during normal operation, so a small discharge capacity is sufficient, but a large amount of condensate is stored at the time of startup, so a large discharge capacity can be exhibited. Things are required.

[0002]

2. Description of the Related Art As a float trap for a large amount that can exhibit a relatively large discharge capacity at the time of start-up and normal operation, for example, there is one shown in Japanese Patent Publication No. 60-600. As understood from the publication, the same outlet passage that forms an inlet, a valve chamber, and an outlet by valve casing, and leads a large-diameter main valve opening and a small-diameter sub-valve opening to the valve chamber to the outlet. The main float that opens and closes the main valve opening and the sub-float that opens and closes the sub-valve are located inside the valve chamber.The sub-valve opens even when the pressure difference between the inlet and outlet is large. Is designed to be opened and closed by itself, and the main valve opening is made large enough to utilize the pressure rise in the outlet passage due to the drainage from the auxiliary valve opening even when the pressure difference between the inlet and the outlet is large.

[0003]

The above-mentioned conventional one is of a size that can be opened and closed by the main float not only at the time of starting when the pressure difference between the inlet and the outlet is small but also at the time of normal operation when the pressure difference between the inlet and the outlet is large. Since the main valve opening was formed in the, the main valve opening could not be made so large. Also, because the pressure in the outlet passage is increased by the drainage from the sub-valve, the discharge capacity in the outlet passage does not increase so much even though the main valve opening is made larger due to the increase in discharge resistance in the outlet passage. It was Therefore, it took a long time to discharge a large amount of condensate accumulated at the time of starting, leaving room for improvement.

Therefore, a technical problem of the present invention is to provide a float type trap capable of discharging a large amount of condensed water accumulated at the time of starting in a short time.

[0005]

The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber and an outlet by valve casing, and to communicate the valve chamber with the outlet. A large-diameter main valve opening is formed in the bottom of the valve chamber, and the main float that opens and closes the main valve is arranged vertically in the valve chamber. The sub-float which forms the sub-valve and opens and closes the sub-valve is vertically guided and arranged in the valve chamber above the main float. When the pressure difference between the inlet and the outlet of the main valve is small. It is characterized in that the main float is sized to open and close by itself, and the sub-valve opening is sized to open and close by itself even when the pressure difference between the inlet and the outlet is large. Is.

[0006]

The operation of the above technical means is as follows.
The main valve mouth is the main flow port when the pressure difference between the inlet and outlet is small.
The size is large enough to be opened and closed by itself, so it can be made large. Further, since the pressure in the outlet passage is not increased by the drainage from the sub valve port, the discharge flow rate does not decrease. Therefore, it is possible to discharge a large amount of condensate water that has accumulated at the time of starting in a short time.

[0007]

EXAMPLES Examples showing specific examples of the above technical means will be described. The bottom cover 2 is screwed to the main body 1, and the valve chamber 3 is provided inside.
To form a valve casing. An inlet 4 is formed at the upper end of the main body 1 and an outlet 5 is formed at the lower end of the bottom lid 2. Entrance 4
And the outlet 5 are formed on the same axis. A large-diameter main valve opening 6 is formed at the opening end of the outlet 5 on the valve chamber 3 side. The main valve port 6 is formed on the axis of the inlet 4 and the outlet 5, and is directly connected to the outlet 5 so that the flow path resistance does not increase.

An elliptical main float 7 for opening and closing the main valve opening 6 is arranged above the main valve opening 6. A sub-valve opening 8 having a small diameter is formed in the main float 7 so as to vertically penetrate therethrough. A spherical sub-float 9 for opening and closing the sub-valve opening 8 is arranged above the main float 7. The main valve opening 6 is formed to have a small pressure difference between the inlet 4 and the outlet 5 so that the main float 7 can be opened and closed by itself at the time of starting, and the auxiliary valve opening 8 has a small pressure difference between the inlet 4 and the outlet 5. The sub-float 9 is formed in such a size that it can be opened and closed by itself at the time of start-up and during normal operation when the pressure difference between the inlet 4 and the outlet 5 is large. Ribs 10 for vertically guiding the main float 7 and the sub-float 9
Is formed on the inner peripheral wall of the main body 1. Reference numeral 11 is a rib for preventing the sub-float 9 from blocking the opening end of the inlet 4 on the valve chamber 3 side.

A large amount of condensate flows into the valve chamber 3 at the time of starting when the pressure difference between the inlet and the outlet is small. Then, the sub-float 9 and the main float 7 float, and the large-diameter main valve opening 6
To open. As a result, a large amount of condensate is discharged in a short time. When the pressure difference between the inlet 4 and the outlet 5 becomes large as in normal operation and the condensate discharge is completed, the sub-float 9 and the main float 7 descend and the sub-valve 8 with a small diameter and the large diameter The main valve opening 6 is closed. During normal operation, the main float 7 keeps the large-diameter sub-valve 8 closed, and the sub-float 9 floats up as the condensate flows into the valve chamber 3 and the sub-valve rises. Open the mouth 8.

[0010]

The present invention produces the following unique effects. As described above, the float type trap according to the present invention can discharge a large amount of condensed water at the time of start-up in a short time, so that the start-up time of the steam or compressed air piping system can be shortened. Further, since the large-diameter main valve opening is opened only at the time of starting and does not open and close frequently, wear of the valve portion can be prevented and a large amount of steam leakage does not occur.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a float trap according to the present invention.

[Explanation of symbols]

 1 Main Body 2 Bottom Lid 3 Valve Chamber 4 Inlet 5 Outlet 6 Main Valve Port 7 Main Float 8 Sub Valve Port 9 Sub Float 10 Rib

Claims (1)

[Claims] 1. A main flow that forms an inlet, a valve chamber, and an outlet by valve casing, forms a large-diameter main valve opening communicating with the valve opening at the bottom of the valve opening, and opens and closes the main valve opening. Is installed in the valve chamber by guiding it vertically, forming a small-diameter sub-valve opening that penetrates the main float in the vertical direction and opening and closing the sub-valve above the main float. It is arranged vertically in the valve chamber of
The main valve opening is formed in such a size that the main float can be opened and closed by itself when the pressure difference between the inlet and the outlet is small, and the sub-valve is independent by the sub-float even when the pressure difference between the inlet and the outlet is large. Float type trap characterized by being formed in a size that can be opened and closed.