JPH056480Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a steam trap that automatically eliminates condensate generated in steam-using equipment and steam transport pipes, and in particular, the invention relates to a steam trap that automatically eliminates condensate generated in steam-using equipment and steam transport pipes. Related to a float-type steam trap that opens and closes its mouth.

Float-type steam traps use the difference in specific gravity between gas and liquid to automatically discharge only condensate without discharging steam. However, when the valve chamber is filled with air, the float releases the valve means. Since the valve is driven to close the valve port, the valve cannot be opened, resulting in so-called air binding.

BACKGROUND ART Therefore, conventionally, bimetals have been used to prevent air binding.
An example of this is shown in Japanese Utility Model Publication No. 50-254.
In this system, an inlet, a valve chamber, and an outlet are formed in the valve casing, a valve port formed on the lower side of the valve chamber is opened and closed by floating up and down a float placed inside the valve chamber, and an exhaust valve port is formed in the upper part of the valve chamber. A bimetal with an exhaust valve body fixed in the center is arranged between the exhaust valve port and a float cover fixed to the upper part of the valve chamber.

Due to the deformation of the bimetal, the exhaust valve element opens the exhaust valve port to exhaust air when the temperature is low, and the exhaust valve element closes the exhaust valve port when the temperature is high.

Problems to be solved by the present invention The float of a float-type steam trap moves due to vibrations during transportation, so there is a problem that it collides with the valve seat or float seat, deforming or damaging it.

The technical problem of the present invention is to use a bimetal that prevents air binding to prevent the float from oscillating during transportation, since the temperature inside the valve chamber is low during transportation.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is that the inlet, valve chamber, and outlet are formed in the valve casing, and the valve chamber is formed at the lower side of the valve chamber. The valve port is opened and closed by the rising and falling of a float placed in the valve chamber, an exhaust valve port is formed in the upper part of the valve chamber, and between the exhaust valve port and a float cover fixed to the upper part of the valve chamber,
In the case where a bimetal with an exhaust valve body fixed in the center is arranged, a first elastic member biases the exhaust valve body downward, and a second elastic member biases the float cover upward.
A float guide is attached to the float cover to hold the float in the open position when the float cover is raised.

Effect The operation of the above technical means is as follows.

At low temperatures, the elastic force of the second elastic member overcomes the deformation force of the bimetal and lifts the float cover. The float guide attached to the float cover lifts the float away from the valve seat or float seat and holds it there, preventing the float from colliding with the valve seat or float seat and causing deformation or damage. Further, in this state, the exhaust valve body is separated from the exhaust valve port by the elastic force of the first elastic member, and air is quickly exhausted. When the temperature is high, the bimetal deforms, overcomes the elastic force of the first elastic member, presses the exhaust valve body against the exhaust valve port, and closes the valve, and the deformation force of the bimetal overcomes the elastic force of the second elastic member. Overcome, push down the float cover,
To release a float from a float guide so that the float can freely move on and off from a valve seat or a float seat.

Effect of invention The present invention produces the following specific effects.

The deformation action of the bimetal, which prevents air binding, simultaneously holds and releases the float.The simple structure using a single bimetal prevents air binding and prevents the float from being transported during transport. It can prevent upset.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

A valve casing is formed by fastening a lid 2 to a main body 1 with bolts 3, and a valve chamber 4 is formed inside. An inlet 5 is opened at the upper part of the valve chamber 4. The inlet 5 communicates with the valve chamber 4 via a cylindrical screen 6. Entrance 5
An outlet 7 is formed on the same axis as.

A valve seat 8 is attached to the lower part of the main body 1. The valve seat 8 is kept airtight from the main body 1 by an O-ring 9 interposed on its outer periphery, and is held by a plug 10 screwed to the main body 1. The valve seat 8 is formed with a valve port 11 opening at the inner end of the valve chamber 4, a valve hole 12 in the axial direction, and a through hole 14 positioned in the direction of the rising passage 13. Valve chamber 4 is valve seat 8
It communicates with the outlet 7 through the valve port 11, the valve hole 12, the through hole 14, and the rising passage 12.

A hollow spherical float 15 is accommodated in the valve chamber 4 in a free state. Float 15 above float 15
Attach the float cover 16 that holds the The float cover 16 has many through holes.
A float seat 17 is formed in the lower part of the valve chamber 4 to determine the lowering position of the float 15. A coil spring 19 (second elastic member) is disposed between a stepped portion 18 formed on the main body 1 and the float cover 16. There are four float guides 20 on the bottom surface of the float cover 16.
Weld and attach.

An exhaust passage 21 is formed in the upper part of the lid 2 and the main body 1, which communicates the upper part of the valve chamber 4 with the outlet 7. Exhaust passage 21
An exhaust valve seat 22 is attached to the inner end of the valve chamber 4. An exhaust valve port 23 is formed in the exhaust valve seat 22.

The exhaust valve port 23 is inserted into the valve chamber 4 by passing through the exhaust valve seat 22.
An exhaust valve body 24 that opens and closes from the side is arranged. A fitting hole 25 is formed in the exhaust valve body 24, and a guide rod 26 is fitted into the fitting hole 25. A bimetal laminate 27 is placed between the lower surface of the exhaust valve body 24 and the float cover 16 around the guide rod 26, and fixed with a snap spring 28.
The bimetal laminate 27 is a stack of bimetal disks whose curved directions are alternated.

An operating rod 30 is screwed to the lid 2 through an O-ring 29 so that it can move forward and backward, and the operating rod 30 and the exhaust valve body 24
A coil spring 31 (first elastic member) is arranged between them. The upper end of the operating rod 30 is made to protrude from the lid 2, and a cutout 32 into which the tip of a tool such as a screwdriver is fitted is provided on the upper end surface. A lock nut 33 is attached to the protrusion of the operating rod 30 to prevent it from loosening.
Cover with cap 34. Reference numbers 35 and 36 are gaskets.

At low temperatures, as shown in the figure, the bimetal laminate 2
7 is flat. The coil spring 19 lifts the float cover 16, and the float guide 20 attached to the float cover 16 lifts the float 15 away from the valve seat 8 and the float seat 17.
Further, the exhaust valve body 24 is separated from the exhaust valve port 23 by the elastic force of the coil spring 31, and air is quickly exhausted. When the temperature is high, the bimetal laminate 27 bends, overcomes the elastic force of the coil spring 31, presses the exhaust valve body 24 against the exhaust valve port 23, and closes the valve.
The float cover 16 is pushed down by overcoming the elastic force of the float cover 16 to release the float 15 from the float guide 20, so that the float 15 can freely move on and off from the valve seat 8 and the float seat 17.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a float type steam trap according to an embodiment of the present invention. 1... Body, 2... Lid, 4... Valve chamber, 5... Inlet, 7... Outlet, 8... Valve seat, 15... Float, 16... Float cover, 17... Float seat, 19 ... Coil spring, 20 ... Float guide, 23 ... Exhaust valve port, 24 ... Exhaust valve body, 27 ... Bimetal laminate.

Claims (1)

[Scope of utility model registration request] An inlet, a valve chamber, and an outlet are formed in the valve casing, and the valve port formed at the bottom side of the valve chamber is opened and closed by the floating and lowering of a float placed inside the valve chamber, and an exhaust valve port is formed at the top of the valve chamber. , in which a bimetal with an exhaust valve body fixed in the center is arranged between the exhaust valve port and a float cover fixed to the upper part of the valve chamber, a first elastic member that biases the exhaust valve body downward; , a second elastic member that biases the float cover upward;
A float type steam trap with a float guide attached to the float cover that holds the float in the open position when the float cover rises.