JPH10227396A - Float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type drain trap which hardly causes biting of foreign materials between a valve body and a valve port. SOLUTION: An inlet 4, a valve chamber 3, and an outlet 5 are formed by a main body 1 and a bottom cover 2. A valve port 8 is formed for communicating the valve chamber 3 with the outlet 5. A float 10 to which a valve body 12 is connected is arranged inside the valve chamber 3. The valve port 8 is opened and closed by means of the valve body 12 due to ascending and discending of the float 10. The float 10 is cylindrically formed. An upper end of the cylindrical float 10 is extended upward compared to a lower end of an opening of the inlet 4 on the side of the valve chamber 3. A valve 12 is connected to the inner side of the cylindrical float 10, which valve body 12 receives fluid pressure of the inlet 4 in an opening direction and receives energizing force of a coil spring 18 in a closing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a specific gravity difference between a gas and a liquid to drive a valve body with a float housed in a valve chamber to condense steam, compressed air, and condensate generated in a gas piping system. Float type drain trap for automatically discharging drain such as water and condensed water.

[0002]

2. Description of the Related Art A conventional float type drain trap is disclosed, for example, in Japanese Patent Publication No. 7-92195. As understood from the publication, an inlet, a valve chamber, and an outlet are formed by casing, a valve port communicating the valve chamber with the outlet is provided in a lower portion of the valve chamber, and a valve body for opening and closing the valve port is connected. The float is placed in the valve chamber. When the liquid level rises due to the drain flowing into the valve chamber from the inlet, the float floats up and the valve body opens the valve port to discharge the drain to the outside. When the liquid level in the valve chamber drops due to the discharge of the drain, the float lowers and the valve body closes the valve port, thereby preventing gas outflow (leakage).

[0003]

In the above-mentioned conventional float type drain trap, foreign matters such as dust and scale mixed into a fluid and flowed into the valve chamber are easily caught between the valve body and the valve port. However, there was a problem that the valve could not be completely closed and leaks easily. This is because the valve element and the valve port are located in the lower part of the valve chamber, so that foreign substances flowing down to the bottom of the valve chamber may be disturbed. This is because the foreign matter collected on the bottom of the valve chamber easily flows into the valve port together with the discharge drain.

Accordingly, it is an object of the present invention to provide a float type drain trap in which foreign matter is hardly caught between a valve body and a valve port.

[0005]

Means for Solving the Problems 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 casing, and to communicate the valve chamber with the outlet. A valve having a valve port, a valve connecting the valve element is disposed in the valve chamber, and the valve port is opened and closed by the floating of the float. The upper end of the float extends above the lower end of the inlet on the valve chamber side, the open end of the valve port on the valve chamber side is located inside the cylindrical float, and the fluid pressure at the inlet springs in the valve opening direction. The float type drain trap is characterized in that a valve body in which the urging force is applied in the valve closing direction is connected to the inside of the cylindrical float.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a float type drain trap according to the present invention, the upper end of a cylindrical float extends above the lower end of an inlet on the valve chamber side, and the open end of the valve port on the valve chamber side is cylindrical. The valve body is located inside the float, and the fluid pressure at the inlet is applied in the valve opening direction and the urging force of the spring is applied in the valve closing direction.
Connected to the inside of the Therefore, most of the foreign matter that has flowed into the valve chamber can flow down the outside of the cylindrical float. In addition, the position of the valve body and the valve port can be raised to be separated from the valve chamber bottom. Therefore, it is difficult for foreign matter to be caught between the valve body and the valve port.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a float type steam trap.

[0008] A bottom lid 2 is fastened to the main body 1 to form a casing having a valve chamber 3 therein. An inlet 4 and an outlet 5 are formed on the same axis at the upper part of the main body 1. The inlet 4 communicates with the upper part of the valve chamber 3. A partition wall 6 extending from the top wall to substantially the center of the valve chamber 3 is provided in the main body 1, and an outlet passage 7 communicating with the outlet 5 is formed in the partition wall 6. A valve seat 9 having a valve port 8 is fixed to the bottom wall of the partition wall 6. The valve chamber 3 communicates with the outlet 5 from the valve port 8 through the outlet passage 7.

A bottomed cylindrical float 10 is arranged outside the partition wall 6. The valve port 8 is located inside the float 10. The upper end of the float 10 extends above the lower end of the opening 4 of the inlet 4 on the valve chamber 3 side. A plurality of communication holes 11 are formed in the bottom wall of the float 10 to communicate the inside and the bottom. A valve body 12 for opening and closing the valve port 8 is fixed to the upper surface of the bottom wall of the float 10 and urged by a coil spring 18 in the valve closing direction. Valve body 12 is float 10
Located inside. Valve stem 13 extending upward to valve body 12
Is formed, and is fitted into the guide hole 14 of the partition wall 6 so as to be vertically movable. A guide rod 15 is fixed to the lower surface of the bottom wall of the float 10 and fitted into a guide hole 16 of the bottom cover 2 so as to be vertically movable. Float 1
A cylindrical screen 17 for catching foreign matter flowing into the valve chamber 3 from the inlet 4 is disposed outside the cylinder 0.

Next, the operation of the float type steam trap of this embodiment will be described. The state shown in FIG.
Is lowered, and the valve body 12 closes the valve port 8. Condensate and steam flow into the valve chamber 3 from the inlet 4 through the screen 17, and the condensate separates at the bottom and the steam separates at the top and accumulates. When the liquid level rises due to the inflow of condensate water, the float 10 rises because of its increased buoyancy, and the valve body 12 opens the valve port 8. As a result, the condensate in the valve chamber 3 is transferred from the valve port 8 to the outlet passage 7.
Through to the outlet 5. Valve room 3 due to condensate discharge
When the liquid level in the inside falls, the float 10 descends with it and the valve body 12 closes the valve port 8. This prevents the outflow of steam.

Foreign matter larger than the mesh of the screen 17 is captured by the screen 17, and small foreign matter passes through the screen 17. The small foreign matter that has passed through the screen 17 is unlikely to flow inward beyond the upper end of the float 10, and most of the foreign matter flows down the outside of the float 10 and accumulates at the bottom of the valve chamber 3. Or on the surface of the valve port 8. In addition, small foreign matter that has accumulated at the bottom of the valve chamber is
It becomes difficult to flow into the valve port inside the gate 10. This allows
Foreign matter is less likely to be caught between the valve body and the valve port.

[0012]

The present invention has the following specific effects. As described above, the float type drain trap according to the present invention is
Since it is difficult for foreign matter to bite between the valve body and the valve port, it is possible to maintain good initial operation without leakage for a long period of time.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Bottom cover 3 Valve room 4 Inlet 5 Outlet 8 Valve port 10 Float 12 Valve element 17 Screen 18 Coil spring

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are formed by casing, a valve port for communicating the valve chamber with the outlet is provided, and a float connected to the valve body is disposed in the valve chamber. The valve opening is opened and closed by a valve body by floating descending, the float is formed in a cylindrical shape, and the upper end of the cylindrical float is extended above the lower end of the opening on the valve chamber side of the inlet. The side opening end is located inside the cylindrical float, and a valve body in which the fluid pressure at the inlet is applied in the valve opening direction and the biasing force of the spring is applied in the valve closing direction is connected to the inside of the cylindrical float. A float type drain trap characterized by the following.