JPH0325520Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a bucket-and-float type steam trap that automatically discharges condensate generated in a steam piping system using a downward-opening bucket and float.
In particular, it relates to a structure that can quickly discharge non-condensable gases such as air and low-temperature condensate.

A bucket-and-float type steam trap using a bucket-to-float that opens downwards floats when steam is introduced through the introduction opening formed at the bottom of the bucket-to-float, and descends when condensate is introduced. The valve opening is opened and closed by the Also, when non-condensable gas such as air is introduced into the bucket float,
As with steam, it floats up and closes the valve opening, but the bucket float is lowered by venting air into the valve chamber through a small diameter vent hole formed at the top of the bucket float. however,
Since this vent hole is small, it takes a long time to vent, and there is a problem that large amounts of low-temperature condensate and air cannot be discharged quickly when starting a steam system.

Prior Art One of the conventional solutions to this problem is shown in Japanese Patent Publication No. 19879/1987. The valve casing forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet is formed at the top of the valve chamber, and an introduction opening for introducing the inlet fluid into the interior is formed at the bottom with a small diameter hole. A downward-opening bucket float with air holes at the top is housed in the valve chamber, a bypass passage is provided that communicates the inlet with the upper part of the valve chamber, and a temperature-responsive member is provided that opens the bypass passage when the inside temperature of the valve chamber is below a predetermined temperature. It is something.

When the temperature inside the valve chamber is low, such as when starting a steam system, the temperature-responsive valve member opens the bypass passage.
Low-temperature condensate and air are discharged from the valve port through the valve chamber from the bypass passage without passing through the inside of the bucket float. Thereafter, when the temperature of the condensate rises, the temperature-responsive valve member closes the bypass passage, introduces all the fluid into the bucket-to-float, and thereafter operates the bucket-to-float type steam trap. It is.

Problems to be Solved by the Invention In this case, it is necessary to separately form a bypass passage, and the temperature-responsive valve member must reliably close the bypass passage when the temperature is high.

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is to form an inlet, a valve chamber, and an outlet in a valve casing, and to provide a valve opening that communicates the valve chamber and the outlet. A downward-opening bucket float is formed in the upper part of the valve chamber, and has an introduction opening at the bottom and a vent hole at the top for introducing the inlet fluid into the valve chamber. In devices that open and close the valve port by driving a separate valve body through a mechanism such as a lever, the vent hole of the bucket and float is formed with a large diameter, and the temperature-responsive member is changed to the bucket and float. It is installed so that the small vent hole is open at times, and the small vent hole is closed during high temperature bending.

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

Since the temperature-responsive member opens the large-diameter vent hole during low-temperature bending, the air introduced into the bucket float quickly passes through the large-diameter vent hole, and the bucket float does not float up. A large amount of low-temperature condensate and air are quickly discharged from the valve port. When the temperature inside the valve chamber becomes high,
The temperature-responsive member constricts the vent hole to approximately the same diameter as a conventional vent hole, so that the well-known bucket-and-float steam trap operates in the same manner as in the prior art. Therefore, there is no need to form a separate bypass passage, and since the temperature-responsive member only needs to narrow the vent hole, there is no need for precise machining to completely close the valve, reducing machining costs. .

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

The vent holes formed in conventional bucket floats are small in diameter and get clogged with foreign matter such as dirt in a short period of time, but in this invention, the vent holes are formed with a large diameter, so foreign matter can be blocked. It won't be blocked by
Therefore, good operation can be achieved over a long period of time.

Example An example showing a specific example of the above technical means will be described. (See Figures 1 and 2) The valve casing is formed by connecting a lid 3 to a main body 1 with bolts (not shown) via a gasket 2 for airtightness, and a valve chamber 4 is formed inside. An inlet 5 is provided on the side of the body 1, extending from there through an inlet passage 6 to the bottom of the body 1 and communicating into the valve chamber 4 through an inlet pipe 7 screwed onto the bottom wall of the body 1. A screen 20 is inserted into the inflow passage 6 and attached with bolts 21. The introduction tube 7 is attached to the main body 1 while sandwiching the launch pad 8. A plurality of ejection holes 9 are provided on the upper side surface of the introduction pipe 8. A valve seat member 10 is screwed onto the inner wall of the lid 3 from the inside. The valve chamber 4 includes a valve port 11 of a valve seat member 10, a valve hole 12, a throttle orifice 13, and an outlet passage 1.
4, it communicates with an outlet 15 provided coaxially with the inlet 5. The inlet 5 and the outlet 15 are formed with female threads for connecting pipes.

In the valve chamber 4 there is accommodated in a free state a downwardly open bucket float 17 which is approximately spherical and has a spherical valve surface on the outside and has an introduction opening 6 at its lower part. An annular cap 19 is attached to the introduction opening 16 portion. A large-diameter vent hole 18 is provided in the upper part of the float 17. One end of the bimetal 22 is attached to the inner surface of the float 17 by spot welding (reference number 23). The bimetal 22 curves as shown in FIG. 1 when the temperature is low to open the vent hole 18, and curves as shown in FIG. 2 when the temperature is high and the other end narrows the diameter of the vent hole 18.

The operation of the steam trap is as follows.

The inlet 5 is connected to a point where condensate is generated in steam-using equipment or the like. When the steam system is started, low-temperature condensate and air enter the inside of the float 17 from the inlet 5 through the inlet passage 6, screen 20, introduction pipe 7, and jet hole 9, and the bimetal 22 is large as shown in Figure 1. Since the large-diameter vent hole is open, air quickly passes through the large-diameter vent hole, and the float does not float up. Therefore, low-temperature condensate and air pass through the valve port 11, the valve hole 12, the orifice 13, and the outlet passage 14, and are quickly discharged to the outlet 15. After that, high temperature condensate flows to float 17.
When the air flows in, the bimetal 22 curves as shown in FIG. 2 to narrow the diameter of the vent hole 18. From then on, the well-known bucket and float type steam trap operates in the same manner as in the past.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the bending state of the bimetal at low temperatures in a downward-opening bucket float steam trap according to an embodiment of the present invention, and Figure 2 is a cross-sectional view of only the main parts showing the bending state of the bimetal at high temperatures. FIG. 1...Main body, 3...Lid, 4...Valve chamber, 5...Inlet, 11...Valve port, 15...Outlet, 16...Introduction opening, 17...Bucket float, 18...Air vent , 22...Bimetal.

Claims (1)

[Scope of utility model registration request] An inlet, a valve chamber, and an outlet are formed in the valve casing, and a valve port communicating between the valve chamber and the outlet is formed in the upper part of the valve chamber.
A downward-opening bucket float with an inlet opening at the bottom and a vent hole at the top for introducing the inlet fluid into the interior is housed in the valve chamber, and the external surface of the bucket float is directly or separately via a mechanism such as a lever. In the case where the valve body is driven to open and close the valve port, the vent hole of the bucket and float is formed with a large diameter, the temperature responsive member is made into the bucket and float, and the small vent hole is opened when bending at low temperature. , a bucket-to-float type steam trap that is installed to squeeze the small vent holes during high-temperature bending.