JPH0325518Y2 - - 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 exhaust valve port is formed at the top of the valve chamber, and a disk-shaped inverted bimetal with an exhaust valve body fixed at the center is placed between the exhaust valve port and a holding member fixed to the top of the valve chamber. , a stopper is provided that the upper surface of the outer peripheral edge of the bimetal comes into contact with to restrict upward movement.

When the temperature is high, the inverted bimetal is convex upward, and the exhaust valve body closes the exhaust valve port.When the temperature is low, it is convex downward, and the upper surface of the outer periphery contacts the stopper, and the exhaust valve body closes the exhaust valve port. Open the valve and let the air out.

Problems to be Solved by the Present Invention In the above system, when used in a low-pressure steam system, the exhaust valve body cannot close the exhaust valve port.
There are problems with steam leakage.

That is, at high temperatures, the inverted bimetal deforms into an upwardly convex shape, but the lower surface of the outer periphery of the inverted bimetal does not come into contact with the upper surface of the holding member, and the bimetal is pushed upward by fluid pressure. This is because the exhaust valve body is designed to close the exhaust valve port, and in a low-pressure steam system, the force pushing up this bimetal is weak, so the exhaust valve body cannot close the exhaust valve port.

If the distance between the exhaust valve port and the holding member is made small so that the lower surface of the outer peripheral edge of the bimetal comes into contact with the top surface of the holding member at high temperatures, the bending force of the bimetal will push the exhaust valve body against the exhaust valve port. It can be designed to However, in this case, when used in a high-pressure steam system, excessive force is applied to the bimetal due to overexpansion, resulting in plastic deformation.

Therefore, the technical problem of the present invention is to be able to reliably close the exhaust valve port at high temperatures and to absorb overexpansion of the bimetal.

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 on the lower side of the valve chamber. The valve opening is opened and closed by the floating and lowering of a float placed inside the valve chamber, an exhaust valve opening is formed in the upper part of the valve chamber, and an exhaust valve is placed in the center between the exhaust valve opening and a holding member fixed to the upper part of the valve chamber. A disk-shaped inverted bimetal with a fixed valve body is arranged, and a stopper is provided to restrict upward movement by abutting the top surface of the outer periphery of the bimetal, and the bimetal is exhausted between the bimetal and the holding member. An elastic member is arranged to bias the valve in the direction of the valve port.

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

The inverted bimetal deforms into an upward convex shape at high temperatures. An elastic member is placed between the bimetal and the holding member to bias the bimetal toward the exhaust valve port, so even when used in a low-pressure steam system, the biasing force of the elastic member prevents the exhaust from being exhausted. The valve body can reliably close the exhaust valve port. When this product is used in a high-pressure steam system, the elastic member absorbs overexpansion of the bimetal. When the temperature is low, the bimetal turns downward into a convex shape, the upper surface of the outer periphery contacts the stopper, and the exhaust valve element opens the exhaust valve port to exhaust air.

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

In a device that changes the distance between the exhaust valve port and the holding member, it is necessary to change the thickness of the valve casing and the holding member depending on the pressure of the steam system. , it can be used from low pressure to high pressure simply by arranging the elastic member.

In the present invention, since the elastic member biases the bimetal in the direction of the exhaust valve port, even if the exhaust valve body is corroded, the exhaust valve port can be closed by the biasing force of the elastic member.

Example An example showing a specific example of the above technical means will be described.

Embodiment 1 (See Figures 1 and 2) 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 that opens 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.

An annular wall 18 is formed on the inner surface of the lid 2, a holding member 20 is fixed via a snap spring 19, and a bimetal chamber 21 is formed inside. A communication hole 22 is formed in the holding member 20, and a screen 23 is attached to the upper surface. An exhaust passage 24 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. An exhaust valve seat 25 is provided at the inner end of the valve chamber 4 of the exhaust passage 24.
Attach. An exhaust valve port 26 is formed in the exhaust valve seat 25.

A disc-shaped inverted bimetal 27 is placed inside the bimetal chamber 21. The exhaust valve body 28 is fixed to the center of the inverted bimetal 27 with a snap spring 31. The exhaust valve body 28 is located opposite the exhaust valve port 26. A disc-shaped wave spring 29 is placed between the inverted bimetal 27 and the holding member 20, and its outer periphery is attached to the holding member 2.
0 and the stepped part of the annular wall. A step portion is provided on the inner circumferential surface of the annular wall 18 to form a stopper 32 that restricts upward movement of the bimetal 22. Reference number 30 is a gasket.

When the temperature is high, the inverted bimetal 27 curves upward in a convex shape as shown in the figure, so that the exhaust valve body 28 closes to the exhaust valve port 26.
is closed, and when the temperature is low, it turns downward into a convex shape and the upper surface of the outer periphery comes into contact with the stopper 32, and the exhaust valve body 2
8 opens the exhaust valve port 26.

Embodiment 2 (See FIG. 3) In this embodiment, the holding member 20 of Embodiment 1 is turned upside down, and a coiled spring 33 is disposed within the central communication hole 22. Components corresponding to FIGS. 1 and 2 are given the same reference numerals and detailed explanations will be omitted.

Embodiment 3 (See FIG. 4) In this embodiment, the coil spring of Embodiment 2 is replaced with a disc-shaped spring 34. Reference number 35 is a snap spring that fixes the disc-shaped spring 34. The holding member 20 is turned upside down and a coiled spring 33 is placed inside the central communication hole 22. Components corresponding to those in FIGS. 1 to 3 are given the same reference numerals and detailed explanations will be omitted.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a floating steam trap according to an embodiment of the present invention, Figure 2 is an enlarged sectional view of only the main parts of Figure 1, and Figures 3 and 4 are other embodiments of the present invention. FIG. 2 is a cross-sectional view similar to FIG. 1... Main body, 2... Lid, 4... Valve chamber, 5... Inlet, 7... Outlet, 15... Float, 20... Holding member, 26... Exhaust valve port, 27... Inverted bimetal, 28...Exhaust valve body, 29...Wave spring, 3
2... Stopper, 33... Coiled spring, 34
...disk-shaped spring.

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 on the lower side of the valve chamber is opened and closed by floating and lowering a float placed inside the valve chamber, and an exhaust valve port is formed in the upper part of the valve chamber. , a disk-shaped inverted bimetal with an exhaust valve body fixed in the center is arranged between the exhaust valve port and a holding member fixed to the upper part of the valve chamber, and the upper surface of the outer periphery of the bimetal comes into contact with the upper surface of the bimetal to cause upward movement. A float-type steam trap equipped with a regulating stopper, in which an elastic member is arranged between the bimetal and the holding member to bias the bimetal toward the exhaust valve port.