JPH0727295A - Float type steam trap - Google Patents

Abstract

PURPOSE:To provide a float type steam trap where no erosion due to the condensate flow is generated in a riser passage. CONSTITUTION:A float 13 is arranged in a valve chamber 4. A valve seat member 10 provided with a valve port 9 is mounted on the lower part of the valve chamber 4. The valve port 9 is connected to the outlet 6 in a riser passage 11. A discharge valve 17 is arranged to the upper end part of the riser passage 11. The discharge valve 17 consists of wall members 19, 20, a diaphragm 21, a storing chamber 22, and a discharge valve element 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float-type steam trap for automatically discharging condensate generated in various steam-using devices and steam pipes to the outside of the system by using a float. -Regarding what prevents erosion due to the condensate of Thing.
Condensate flowing into the trap is in a high pressure state of 16 km or 21 km, and when the high pressure condensate is discharged into the atmosphere, its flow velocity becomes very high and erosion occurs. In addition, the greater the amount of condensate generated, the greater the energy of the fluid and the more significant the erosion.

[0002]

2. Description of the Related Art Float-type steel that prevents conventional erosion
As the mutrap, for example, one disclosed in Japanese Patent Laid-Open No. 3-177699 has been used. This is because by forming the shape of the inner wall surface of the outlet passage against which the condensate flowing out from the valve opening collides into a concave spherical surface, it is possible to prevent it from colliding with the inner wall surface of the rising passage of the trap casing. It prevents the erosion of valve casing.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
Although erosion of the side surface of the rising passage of the valve casing can be prevented, there is a problem that the erosion of the upper end surface of the rising passage cannot be reliably prevented.

Therefore, a technical problem of the present invention is to obtain a float type steam trap which can surely prevent erosion even at the upper end surface of the rising passage of the valve casing.

[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. An exhaust valve in which the valve opening is formed in the lower part of the valve chamber, a rising passage is provided between the valve opening and the outlet, and the valve opening is opened and closed by the float arranged in the valve chamber. An opening is formed substantially coaxially with the rising passage, and an exhaust valve is arranged so as to face the exhaust valve opening. The exhaust valve includes a wall member, a diaphragm having an outer peripheral edge fixed to the wall member, and a diaphragm. And an expansion medium enclosed between the wall member and the wall member, and an exhaust valve body which opens and closes an exhaust valve port connected to the diaphragm.

[0006]

The operation of the above technical means is as follows.
Due to the condensate that has flowed into the valve chamber, the float floats and opens the valve port, and the condensate is discharged from the outlet via the rising passage. When condensate flows to the extent that it cannot be completely discharged from only the valve port, the condensate stays and the temperature drops due to natural heat dissipation. When the temperature is lowered, the expansion medium enclosed in the exhaust valve is liquefied and its volume is reduced, so that the exhaust valve body is opened and the exhaust valve port is opened. Therefore, a large amount of condensed water is discharged from the upper part of the rising passage through the exhaust valve port. On the other hand, condensate is also discharged from the lower valve port, and the condensate flows of both of these collide in the rising passage, and the velocity energy of the condensate is offset, and the condensate violently collides with the upper end surface of the rising passage. To prevent

By forming the exhaust valve with the expansion medium and the diaphragm, a relatively large exhaust valve opening can be opened, and the temperature of the condensate at which the exhaust valve opening is opened is appropriately selected according to the type of expansion medium. It is also possible to open the exhaust valve opening continuously according to the inflow of condensed water.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). A lid 2 is fastened to the main body 1 with bolts 3 to form a valve casing having a valve chamber 4 inside. An inlet 5 and an outlet 6 are formed on the main body 1 on the same axis. A screen 8 having a through hole 7 is arranged above the valve chamber 4.
The inlet 5 is communicated with the valve chamber 4 from the through hole 7 through the screen 8. A valve seat member 10 having a valve opening 9 opened in the lower portion of the valve chamber 4 is screwed to the main body 1. The valve chamber 4 rises from the valve opening 9 and communicates with the outlet 6 through the passage 11. A plug 12 made of a hard material having corrosion resistance is attached to the valve opening 9 and the extension of the central axis. Ascends and descends according to the liquid level in the valve chamber 4
The closed spherical float 13 for opening and closing is placed in a free state. A float seat 14 is provided in the valve chamber 4 where the float 13 is held at a position where the valve opening 9 is closed.

The exhaust valve port 1 is provided at the upper end of the rising passage 11.
The exhaust valve seat 16 having the opening 5 is attached by screw connection.
An exhaust valve 17 is arranged so as to face the exhaust valve seat 16. Entrance 5
Is communicated with the outlet 5 via the communication passage 18 through the exhaust valve 17. The exhaust valve 17 includes upper and lower wall members 19 and 20, a diaphragm 21 whose outer peripheral edges are fixed by welding at ends of the wall members 19 and 20, and a storage chamber 22 formed by the diaphragm 21 and the upper wall member 19. It is composed of an expansion medium sealed in the accommodation chamber 22 and an exhaust valve body 23 attached to the diaphragm 21. The diaphragm 21 may be a single piece or a plurality of pieces. When a plurality of pieces are used, the exhaust valve element 23 can be attached to the lower diaphragm. The expansion medium 24 sealed in the storage chamber 22 is made of water, a liquid having a lower boiling point than water, or a mixture thereof, and is appropriately selected according to the condensate temperature to be discharged. The exhaust valve 17 is housed in a substantially U-shaped mounting member 26 fixed by being sandwiched between the lid member 25 and the exhaust valve seat 16, and is held by a spring member 27.

Next, the operation will be described. Screen from entrance 5
The condensate that has flowed into the valve chamber 4 through the valve 8 floats up the float 13 and opens the valve port 9, so that the condensate rises and is discharged to the outlet 6 through the passage 11. When the condensate is discharged and the liquid level in the valve chamber 4 is lowered, the float 3 is also lowered and the valve port 9 is closed to prevent the leakage of steam.

A part of the condensate flowing in from the inlet 5 also reaches the exhaust valve 17 through the communication passage 18. If the temperature of the condensate is the desired temperature, that is, the temperature at which the expansion medium in the storage chamber 22 is liquefied, the volume of the expansion medium in the storage chamber 22 becomes the minimum and the diaphragm 21 is pushed upward by the condensate pressure. Therefore, the exhaust valve body 23 is separated from the exhaust valve seat 16 to open the exhaust valve port 15, and the condensed water is discharged from the upper end of the rising passage 11 to the outlet 6. When the temperature of the condensate rises and becomes close to the steam temperature, the expansion medium in the storage chamber 22 is vaporized and expanded, so that the exhaust valve body 23 is seated and the exhaust valve port 15 is also closed, resulting in steam leakage. Is prevented.

In the rising passage 11, the condensate from the lower part through the valve port 9 is directed to the outlet 6, while the condensate from the upper part is directed through the exhaust valve port 15 toward the outlet 6 and the two collide with each other to generate fluid. The energy is canceled out, and the condensate flow that violently collides with the upper part of the rising passage 11 disappears,
Therefore, erosion is prevented.

[0013]

The present invention produces the following unique effects. As described above, the float type steam trap according to the present invention makes the condensate flow from the upper exhaust valve and the condensate flow from the lower valve port collide with each other to cancel the energy of the fluid,
It is possible to reliably prevent erosion on the upper end surface of the rising passage.

[Brief description of drawings]

FIG. 1 is a sectional view of a float type steam trap of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid 4 Valve Chamber 5 Inlet 6 Outlet 9 Valve Port 11 Rising Passage 13 Float 15 Exhaust Valve Port 16 Exhaust Valve Seat 17 Exhaust Valve 19, 20 Wall Member 21 Diaphragm 22 Storage Chamber 23 Exhaust Valve Disc

Claims (1)

[Claims] 1. A valve casing is provided with an inlet, a valve chamber and an outlet, a valve port communicating the valve chamber with the outlet is formed in the lower part of the valve chamber, and a rising passage is provided between the valve port and the outlet. In a valve which is opened and closed by a float arranged in a room, an exhaust valve opening communicating the upper part of the valve chamber with the outlet is formed substantially coaxially with the rising passage, and the exhaust valve is opposed to the exhaust valve opening. And an exhaust valve which opens and closes a wall member, a diaphragm having an outer peripheral edge fixed to the wall member, an expansion medium enclosed between the diaphragm and the wall member, and an exhaust valve port connected to the diaphragm. A float-type steam trap, which is characterized by comprising a valve body.