JP2012225398A - Float type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent erosion on an inner wall of an exit passage by fluid at a maximum use pressure or higher exhausted from a second valve port.SOLUTION: A trap chamber 14 and the exit passage 15 are formed in trap casings 1, 2, 3, 6 and 8 having an entrance 5 and an exit 7. A valve seat 18 having a valve port 17 that communicates the trap chamber 14 with the exit passage 15 is provided, and a float 22 releasing from and seating on the valve seat 18 to open and close a valve port 17 is disposed in the trap chamber 14. A second valve seat 26 having a second valve port 25 that communicates the trap chamber 14 with the exit 7 is provided, and a valve member 28 releasing from and seating on the second valve seat 26 to open and close the second valve port 25 is disposed in the exit 7 side of the second valve port 25. The valve member 28 is biased in a direction of closing the valve by a coil spring 31 disposed between the member and a spring bearing 30. The center axis of the second valve port 25 is formed coaxially with the center axis of the exit 7. An exit side end of the second valve seat 26 is opened in the exit 7 to which an exit pipe 32 is connected.

Description

The present invention relates to a float-type steam trap that automatically discharges condensate generated in a steam piping system such as a steam transport pipe and steam-using equipment, and particularly when the trap chamber pressure becomes higher than the maximum working pressure. It relates to what can be said.

A conventional float steam trap is disclosed in, for example, Patent Document 1. This includes a trap casing having an inlet and an outlet, a trap chamber that communicates with the inlet and an outlet passage that communicates with the outlet, a valve seat that has a valve port that communicates the trap chamber with the outlet passage, and is attached to and detached from the valve seat Then, a float that opens and closes the valve port is disposed in the trap chamber, and a second valve seat having a second valve port that communicates the trap chamber with the outlet passage side is provided, and the second valve seat is attached to and detached from the second valve seat. A valve member for opening and closing the valve port is disposed on the outlet passage side of the second valve port, and the valve member is urged in the valve closing direction by an elastic member disposed between the valve member and the spring receiver.

JP 2004-76831 A

In the conventional float type steam trap, the valve member is seated on the second valve seat by the urging force of the elastic member until the pressure in the trap chamber reaches the maximum usable pressure, and the second valve port is closed. In this state, the float rises and falls together with the liquid level in the trap chamber, so that the float is separated from the valve seat to open and close the valve opening. When the trap chamber pressure reaches the maximum working pressure, the valve member separates from the second valve seat against the biasing force of the elastic member and opens the second valve port. Thereby, it is excellent that the valve can be opened when the pressure in the trap chamber becomes higher than the maximum operating pressure. However, there is a problem that the inner wall of the outlet passage is eroded because the fluid discharged from the second valve port flows down while colliding with the inner wall of the outlet passage.

Therefore, the problem to be solved by the present invention is to provide a float type steam trap that can prevent the inner wall of the outlet passage from being eroded by the fluid having the maximum operating pressure discharged from the second valve port.

In order to solve the above problems, the float steam trap of the present invention has a trap casing having an inlet and an outlet, a trap chamber communicating with the inlet and an outlet passage communicating with the outlet, and the trap chamber communicating with the outlet passage. A valve seat having a valve opening for opening and closing a valve seat to open and close the valve opening is arranged in the trap chamber, and a second valve seat having a second valve port communicating with the outlet of the trap chamber is provided. A valve member that opens and closes the second valve port by being attached to and detached from the second valve seat is disposed on the outlet side of the second valve port, and the valve member is closed in the valve closing direction by an elastic member disposed between the spring receiver and the valve member. The central axis of the second valve port is formed on the same axis as the central axis of the outlet, and the outlet side end of the second valve seat is opened in the outlet to which the outlet pipe is connected. Is.

According to the present invention, the second valve seat having the second valve port that communicates the trap chamber with the outlet is provided, and the valve member that opens and closes the second valve seat and opens and closes the second valve port is provided on the second valve port. By urging the valve member in the valve closing direction by an elastic member arranged on the outlet side and between the spring receiver, the central axis of the second valve port is formed on the same axis as the central axis of the outlet, Since the fluid exceeding the maximum working pressure discharged from the second valve port is discharged directly to the outlet in the direction of the central axis of the outlet, it is possible to prevent the inner wall of the outlet passage and the inner wall of the outlet from being eroded. There is an effect. Further, by opening the outlet side end of the second valve seat into the outlet to which the outlet pipe is connected, fluid exceeding the maximum operating pressure discharged from the second valve port is placed in the outlet pipe connected to the outlet. Since it is discharged, it is possible to more reliably prevent the inner wall of the outlet passage and the inner wall of the outlet from being eroded.

It is sectional drawing of the float type steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The trap casing is composed of main bodies 1 and 2 formed by press-molding a stainless steel thin plate, a partition member 3, an inlet member 6 provided with an inlet 5, and an outlet member 8 provided with an outlet 7. The inlet member 6 is welded to the main body 1 (location of reference number 9), the outlet member 8 is welded to the main body 2 (location of reference number 10), and the partition member 3 and the main body 2 are welded (location of reference number 13). The main body 1 and the partition member 3 are welded (location of reference numeral 12), and the inside of the trap casing is partitioned into a trap chamber 14 that communicates with the inlet 5 and an outlet passage 15 that communicates with the outlet 7. The central axis of the inlet 5 and the central axis of the outlet 7 are formed on the same axis.

A valve seat 18 having a valve port 17 communicating with the trap chamber 14 and the outlet passage 15 is welded to the lower part of the partition member 3 (location of reference numeral 19). The valve seat 18 includes a base portion and a tip portion press-fitted into the base portion, and a valve port 17 is formed at the tip portion. The valve port 17 is located below the outlet 7 and communicates with the upper outlet 7 via the outlet passage 15. A float 22 made of a stainless steel thin plate in a hollow sphere shape is accommodated in the trap chamber 14 in a free state. The float 22 opens and closes the valve port 17 with its outer surface directly attached to and detached from the valve seat 18. A float seat 23 is attached to the valve seat 18. The float seat 23 has two legs parallel to the axis that are separated from the axis of the valve port 17 by the length of the radius of the float 22. A screen 24 made by press-molding a stainless steel thin plate having a small hole in the inlet chamber 14 is attached to the main body 1 by spot welding at several locations.

A second valve seat 26 having a second valve port 25 communicating with the trap chamber 14 and the outlet 7 is welded to the upper portion of the partition member 3 (location indicated by reference numeral 27). The central axis of the second valve port 25 is formed on the same axis as the central axis of the outlet 7. A spherical valve member 28 that opens and closes to the second valve seat 26 and opens and closes the second valve port 25 is disposed on the outlet 7 side of the second valve port 25. A spring receiver 30 whose displacement toward the outlet 7 side is regulated by the snap ring 29 is disposed on the outlet 7 side of the valve member 28, and the valve member 28 is elastically biased in the valve closing direction between the valve member 28 and the spring receiver 30. A coil spring 31 as a member is disposed. The outlet side end of the second valve seat 26 is opened in the outlet 7 to which the outlet pipe 32 is connected.

The operation of the above embodiment will be described. The inlet 5 is connected to a condensate generation site such as a steam using device. Condensate and steam flow into the trap chamber 14, and condensate accumulates at the bottom and steam separates at the top. Until the pressure in the trap chamber 14 reaches the maximum working pressure, the valve member 28 is seated on the second valve seat 26 by the biasing force of the coil spring 31 to close the second valve port 25. In this state, the float 22 increases in buoyancy as the liquid level rises, so it floats away from the valve seat 18 and opens the valve port 17. As a result, the condensate in the trap chamber 14 is discharged from the outlet 7 through the outlet port 15 from the valve port 17. When the liquid level drops due to the discharge, the float 22 descends at the same time and sits on the valve seat 18 at a position on the float seat 23 to block the valve port 17 and prevent leakage of steam. When the pressure in the trap chamber 14 reaches the maximum usable pressure, the valve member 28 moves away from the second valve seat 26 against the biasing force of the coil spring 31 and opens the second valve port 25. Thereby, the valve is opened when the pressure in the trap chamber 14 becomes higher than the maximum working pressure. Since the fluid exceeding the maximum working pressure discharged from the second valve port 25 is discharged directly to the outlet 7 in the direction of the central axis of the outlet 7, the inner wall of the outlet passage 15 and the inner wall of the outlet 7 are eroded. Can be prevented. Moreover, since the fluid more than the maximum operating pressure discharged | emitted from the 2nd valve port 25 is discharged | emitted in the outlet piping 32 connected to the outlet 7, it is eroded on the inner wall of the outlet channel 15 and the inner wall of the outlet 7. It can be prevented more reliably.

INDUSTRIAL APPLICATION This invention can be utilized for the float type steam trap which discharges automatically the condensate which generate | occur | produces in steam piping systems, such as a steam transport pipe and a steam using apparatus.

DESCRIPTION OF SYMBOLS 1 Main body 2 Main body 3 Partition member 5 Inlet 6 Inlet member 7 Outlet 8 Outlet member 14 Trap chamber 15 Outlet passage 17 Valve port 18 Valve seat 22 Float 23 Float seat 24 Screen 23 Float seat 25 Second valve port 26 Second valve seat 28 Valve member 29 Snap ring 30 Spring receiver 31 Coil spring 32 Outlet piping

Claims (1)

A trap casing having an inlet and an outlet is provided with a trap chamber communicating with the inlet and an outlet passage communicating with the outlet, and a valve seat having a valve port communicating the trap chamber with the outlet passage is provided. In the trap chamber having a float for opening and closing the opening, a second valve seat having a second valve opening communicating with the trap chamber to the outlet is provided, and the second valve opening is opened and closed by being separated from the second valve seat. The valve member is arranged on the outlet side of the second valve port, the valve member is biased in the valve closing direction by an elastic member arranged between the spring receiver, and the central axis of the second valve port is the same as the central axis of the outlet A float type steam trap formed on a shaft and having an outlet side end of a second valve seat opened in an outlet to which an outlet pipe is connected.

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