JP3443613B2 - Large capacity steam trap - Google Patents

Description

Description: 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 steam trap for discharging a large amount of condensate. Regarding traps that can be discharged. The steam trap must discharge the condensate condensed by the work of steam quickly without stagnation and without leaking the steam. Also,
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. 2. Description of the Related Art Conventionally, a steam trap as disclosed in, for example, 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] In the above conventional device,
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] In order to solve the above-mentioned technical problems, the technical means of the present invention is to form an inlet and an outlet through a valve port in a trap casing, place the piston valve body for opening and closing the valve port in opposition to,該Pi
The valve-port side of the piston valve body is a conical shape, a cylinder member attached to the piston valve to the trap casing slidably placed, the piston valve body inlet communicating passage for inlet communicating with said cylinder member in those formed by providing a float valve for blocking the outlet and communicating in the cylinder member, enter
Fluid from the port flows through the inlet communication passage to the float valve.
Supply to the periphery of the cylinder and
An elastic member for urging the ston valve body in the valve closing direction is arranged . The operation of the above technical means is as follows.
Fluid flowing from the inlet reaches the inside of the cylinder member via the inlet communication passage. When the inflowing fluid is a liquid, that is, condensate, the float valve provided in the cylinder member generates buoyancy in the float and floats to communicate the inside of the cylinder member with the outlet, thereby allowing the cylinder to communicate with the outlet. Condensate does not stay in the member. Therefore, the piston valve element slides on the cylinder member by the fluid pressure from the inlet to open the valve port away from the valve port, and condensate flows from the inlet to the outlet side through the valve port. When the fluid from the inlet changes from condensed water to gaseous vapor, the float descends with almost no buoyancy of the float, so that the fluid flowing through the inlet communication passage into the cylinder member is reduced. It stays at the same pressure as the inlet side. Therefore, the pressure state before and after the piston valve body becomes the same, and the piston valve body is displaced in the valve port direction by the elastic force of the elastic member to close the valve port, thereby preventing the steam from flowing down to the outlet side. As described above, if the fluid flowing into the trap casing is condensed water, the valve port is opened and flows down to the outlet, whereas if the fluid is steam, the valve port is closed and the outlet side is closed. A function as a steam trap for preventing the water from flowing down is produced. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The body 1 and the lid 2 form a trap casing. An inlet 3, a valve port 4 and an outlet 5 are formed by trap casing. An annular piston valve seat 19 is provided around the valve port 4. The piston valve element 6 is arranged so as to face the valve port 4. The piston valve body 6 connects the cylindrical portion 7 with the valve port 4 side being conical. A substantially cylindrical cylinder member 8 fixed by trap casing around the cylindrical portion 7 is attached.
The lower surface of the cylinder member 8 is covered with a partition 9 formed on the lid 2, and the inner periphery of the cylinder member 8 is slidably disposed by the cylindrical portion 7 of the piston valve body 6. Inlet communication passage 10 for communicating the inlet 3 with the inside of the cylinder member 8 at the upper end of the piston valve element 6
Is provided to penetrate through. A coil spring 17 as an elastic member for urging the piston valve body 6 toward the valve seat 19 is disposed on the inner periphery of the cylinder member 8. A spring guide 18 is provided integrally with the piston valve element 6 inside the coil spring 17. A float valve 11 is provided inside the cylinder member 8 as a pilot valve. The float valve 11 has a guide seat 13 in which a hollow spherical float 12 is provided on the inner periphery of the piston valve body 6 (only one guide seat is shown in FIG. 1, but a guide seat is actually provided in front of the drawing). It is arranged in a free state on the upper side, and a float valve seat 15 having a float valve port 14 opened to communicate with the outlet 5 is attached to a lower portion thereof. When the condensate flows in, the float 12 floats up and opens the float valve port 14 to discharge the condensate to the outlet 5. A substantially U-shaped bimetal 16 is mounted between the float valve seat 15 and the lid 2. As shown in FIG. 1, the bimetal 16 is displaced toward the float valve seat 15 and does not participate in the float 12 as shown in FIG.
The float valve opening 14 is opened by forcibly separating the float 12 from the float valve seat 15. A screen 23 for filtering foreign substances in the fluid from the inlet communication passage 10 is attached to the upper part of the float 12. Next, the operation will be described. The state shown in FIG.
The state in which the float valve port 14 is opened when the high temperature condensate flows in from the inlet 3 and the float valve 11 is opened, and the inside of the cylinder member 8 communicates with the outlet 5 is shown. The condensate flowing from the inlet 3 is connected to the inlet communication passage 10 and the screen 2
The condensate flows down to the outlet 5 and stays in the cylinder member 8 when the float 12 reaches the periphery of the float 12 and floats up and separates from the float valve seat 15. There is no. Accordingly, the piston valve element 6 is displaced obliquely downward by the fluid pressure from the inlet 3 to open the valve port 4, thereby discharging a large amount of condensate from the inlet 3 to the outlet 5 via the valve port 4. Can be. When steam flows in from the inlet 3 in place of the condensate, the float 12 of the float valve 11 loses buoyancy and descends, thereby closing the float valve port 14 and causing the cylinder member to move. 8 Shut off between the inside and the outlet 5. When the fluid is shut off, the fluid on the inlet 3 side is supplied to the inside of the cylinder member 8 via the inlet communication passage 10, so that the inside of the cylinder member 8 is substantially in the same pressure state as the inlet 3, and the piston valve body 6 is The piston 17 is displaced toward the valve port 4 by the elastic force of the valve 17 and finally sits on the piston valve seat 19 to close the valve port 4 and prevent the steam from flowing down to the outlet 5. When the temperature of the condensed water flowing from the inlet 3 is low, or when low-temperature air is flowing, the bimetal 16 is displaced and the float 12 is pushed up obliquely upward, whereby the float is raised. By opening the valve port 14 and communicating with the outlet 5, the piston valve element 6 separates from the valve seat 19 and discharges low-temperature condensate and air to the outlet 5 side. The present invention has the following specific effects. As described above, according to the present invention, the float valve as the pilot valve and the piston valve are not disposed separately from each other, but the float valve is disposed inside the piston valve, that is, the cylinder member. In addition to being simple, the shape can be small.

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. [Description of Signs] 1 Main body 2 Lid 3 Inlet 4 Valve port 5 Outlet 6 Piston valve body 8 Cylinder member 10 Inlet communication path 11 Float valve 12 Float 14 Float valve port 16 Bimetal 17 Coil spring 19 Piston valve seat

Claims (1)

(57) [Claim 1] An inlet and an outlet are formed in a trap casing through a valve port, and a piston valve body that opens and closes the valve port is disposed opposite the valve port , Conical on the valve opening side of the piston valve body
And Jo, an inlet communicating path in a cylinder member attached to the piston valve to the trap casing is slidably placed to the inlet in communication with the cylinder member to the piston valve body
In what was, by providing a float valve for blocking the outlet and communicating in the cylinder member, the fluid from the inlet, the inlet communicating
Supply around the float of the float valve
The piston valve is attached to the inner circumference of the cylinder member in the valve closing direction.
A large-capacity steam trap in which a biasing elastic member is arranged .