JPS6249517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve operating device for a bell float type gas phase trap.

This type of gas phase trap, especially a steam trap, is equipped with an inverted bucket with an open bottom end and small holes in the top wall in the condensate storage chamber, and the interior of the inverted bucket is connected to the entrance of the condensate storage chamber. The end of the inflow channel is opened, and the gas phase of the fluid introduced through the inflow channel gradually escapes or recovers from the small pores formed in the top wall of the lodging bucket. Due to the reduction in the gas phase volume due to condensation as water, or the change in bucket buoyancy due to the exchange between the gas and liquid phases, the valve hole of the valve seat cylinder attached to the partition wall that separates the condensate reservoir chamber from the drainage channel leading to the outlet. Selective discharge of condensate whose temperature has dropped by self-control of the drain valve that controls opening and closing, and recovery of the buoyancy of the bucket due to the arrival of the gas phase accompanying the condensate flowing down as the discharge is carried out. Air traps are used to selectively remove only condensed moisture from compressed air, and they operate in a similar manner. We decided to collectively refer to both the air traps as the gas phase trap.

The drain valve of a bell float type gas phase trap is small because under the load of the valve closing force based on the pressure inside the condensate reservoir, the underwater weight of the bell float that has lost buoyancy can overcome the load and force the valve to open. In order to achieve reliable valve opening with the bell float of Conventionally, it has generally been difficult to realize this under the ratio.

This invention completely eliminates the use of independent parts such as fulcrum links, and is based on the development of a lever mount that can provide a sufficient lever ratio. This is what we propose.

In this invention, a condensate reservoir chamber is equipped with a lodging bucket with an open bottom end and a small hole in the top wall, and the end of an inflow passage communicating with the inlet of the condensate reservoir chamber is opened toward the inside of the collapsible bucket. , a drain valve that controls the opening and closing of a valve hole in a valve seat cylinder attached to a partition wall that separates a condensate storage chamber from a drainage channel leading to an outlet, due to a change in bucket buoyancy based on the exchange between air and liquid phases inside the lodging bucket. In a bell-float type gas phase trap that performs self-control, a valve guide is provided at the bottom of the valve seat tube, and an operating lever is attached to the stem of the drain valve that protrudes through the valve guide and faces the top wall of the lodging bucket. This operating lever is a float-type gas phase trap having one end pivoted to an eyepiece fixed to the top wall of the inverting bucket, and the other end removably facing the lower surface of the valve guide.

This invention is well suited to a type in which the main valve is opened and closed by a pilot needle and follows the lead, as will be explained below with reference to the illustrated embodiment.
It goes without saying that the present invention is not limited to this, and can be used when directly controlling a single valve.

Now, FIG. 1 shows a preferred embodiment of the present invention in cross section.

In the figure, 1 is a trap case, 2 is a cover, 3 is an inlet, 4 is an outlet, and 5 is a condensate storage chamber formed inside the case 1.

In accordance with the customary practice of bell float type gas phase traps, the condensate reservoir chamber 5 is equipped with a lodging bucket 7 having an open bottom end and a small hole 6 at the top end, and an inlet of the condensate reservoir chamber 5 facing into the interior of this lodging bucket. A nozzle 9 opens the end of the inlet passage 8 communicating with the inlet 3 .

The condensate reservoir chamber 5 is closed by a cover 2, and the cover 2 is provided with a partition wall 11 that partitions a drainage channel 10 from the condensate reservoir chamber 5, and the drainage channel 10 is communicated with the outlet 4 of the trap case 1. 12 is a gasket of the cover 2.

A valve seat tube 13 is screwed and fixed to the partition wall 11 in a conventional manner, and a drain valve 15 for opening and closing the valve hole 14 is connected to the lodging bucket 7.

That is, when the condensate storage chamber is filled with cold water, the falling bucket sinks due to its weight in the water, and as cold water is discharged from the valve hole 14 that opens there, the inlet 3 is pushed by the following steam. High-temperature condensate arrives one after another, and the steam mixed in with this gradually accumulates and fills the inside of the falling bucket 7, and the buoyancy acting on the bucket 7 overcomes the weight of the bucket 7 in the water, causing the valve to close. The valve remains closed until the steam filling the lodging bucket 7 escapes from the small pores 6 into the condensate storage chamber 5 or condenses, causing a loss of buoyancy. This means that the downward force obtained by subtracting the buoyancy due to residual steam from the underwater weight of the overturned bucket 7 overcomes the closing force due to the internal pressure of the condensate reservoir chamber 5 acting on the drain valve 15 that closes the valve hole 14. In this way, the opening and closing operations of the drain valve are self-controlled.

The illustrated drain valve 15 is the pilot needle 16
is combined with the hollow main valve 17 to form a variable pressure chamber 18 in the valve seat cylinder 13 that operates the main valve 17 in cooperation with the pilot needle 16.
By switching the internal pressure of the condensate reservoir chamber 5 and the drainage channel 10 between them, and secondarily opening and closing the main valve 17, the lodging bucket 7 is operated integrally or in conjunction with the main valve 17. Since the pressure area of the pilot needle 16 is much smaller than that of the pilot needle 17, it can be advantageously miniaturized. In the figure, 20 is the switching valve 1
This is a valve guide having nine valve ports, and in this example, a valve stem 21 integrated with a switching valve 19 is passed through and protrudes.

The valve stem 21 has a holder 22 at its upper end and restrains the pilot needle 16 from being movable in the axial direction via a restraining ring 23, so that the valve stem 21 has a tendency to close so that the pilot needle 16 accompanies the flow of condensate around it. It is preferable that
Here, 24 is a retaining pin of the restraining ring 23.

When the drain valve 15 is a single valve, the main valve 17,
The switching valve 19 is omitted, and the pilot needle 16 itself is adapted to the valve hole 14, and a valve guide 20 is provided in which a valve stem 21 is provided at the bottom of the valve seat cylinder 13, integrally with the pilot needle 16, or connected thereto in the same manner as above. Penetrate and protrude.

In this invention, irrespective of which type the drain valve 15 is, an operating lever 25 is pivotally supported on the valve stem 21, and one end of the operating lever 25 is fixed to the top wall of the lodging bucket 7. The valve guide 20 is pivoted to the eyepiece 26, and its other end is removably opposed to the lower surface of the valve guide 20.

In the illustrated example, the lower end of the valve stem 21 and the eyepiece 26 are shaped like a clevis, and the operating lever 25 is held between the lower ends of the valve stem 21 and the eyepiece 26 are pivoted by pins 27 and 28, respectively. It acts as a stopper that abuts against the top wall of the lodging bucket 7.

When the gas phase filling the lodging bucket 7 escapes from the small pores 6 or condenses when the gas phase is steam, the internal volume of the bucket begins to decrease, due to the accompanying decrease in buoyancy. As shown in FIG. 2a, the weight of the falling bucket 7 in the water acts on the operating lever 25 with the pin 28 as the point of force as indicated by the arrow _F1 . At this time, the other end of the operating lever 25 uses the contact point A with the valve guide 20 as a fulcrum to generate a valve opening force on the valve stem ₂₁ that is increased according to the lever ratio of _2/1 shown in the figure. The distance ₁ between the fulcrum and the point of application can be made sufficiently small, so that the lever ratio is large and therefore the smaller lodging bucket 7 allows the drain valve 15, in this example the pilot needle 16
A valve-opening force that easily overcomes the valve-closing force acting on the valve can be obtained.

When the pilot needle 16 is pulled down in this manner, the switching valve 19 closes the pressure transformation chamber 18 to the condensate reservoir chamber 5 while opening it to the drain channel 10, as shown in FIG. 21 so that it is locked.

As a result, the hollow main valve 17 is pushed down by the pressure difference between it and the variable pressure chamber 18, opening the large-diameter valve hole 14 and releasing a large amount of condensate.

Due to the release of condensate due to the opening of the main valve 17 shown in FIG. The bucket cart 7 is made to float, and then, as shown by arrow _F2 in the figure, the top wall of the tipped bucket cart 7 hits the lower end of the valve stem 21, exerting a direct thrust on it, pushing up the pilot needle 16, and switching valve 19. Open the transformation room 1
8 is communicated with the interior of the condensate reservoir chamber 5, thus causing the pilot needle 16 to follow the flow of condensate around it and closing the hollow hole of the main valve 17.

Subsequently, the main valve 17 is also pushed up by the valve stem 21 due to the buoyant force acting on the lodging bucket 7, and the valve hole 1 is pushed up.
4 is closed, and thus the discharge of condensate is interrupted. At this time, the upward thrust applied to the valve stem 21 due to the floating of the inverted bucket 7 is unrelated to the lever ratio of the operating lever 25, so the above-mentioned The seating impact upon closing of the valve is advantageously damped. The operation of closing the valve and changing it to open due to the floating of the inverted bucket 7 has already been described, and by repeating this operation, the gas phase is captured and only the condensate is selectively released. .

As described above, in this invention, there is no need for a separate member such as a fulcrum link of the operation lever as a linking means for operating the drain valve due to the displacement of the lodging bucket, especially the settling movement. Since the contacting fulcrum is formed by the operating lever, the distance ₁ between this fulcrum and the point of action at the lower end of the valve stem of the drain valve can be reduced, so the lever ratio can be increased without increasing the length of the operating lever. As a result, it is possible to secure sufficient valve opening force using a smaller lodging bucket, which makes it possible to advantageously downsize the gas phase trap.Also, the lever ratio of the operating lever has no relation to the closing operation of the drain valve, so The upward force caused by the floating bucket is not amplified, and there is no risk of excessive valve closing impact being applied.

[Brief explanation of the drawing]

FIG. 1 shows the cross-sectional area of a preferred embodiment of the invention;
Figures a, b, c and d are explanatory diagrams showing each stage of the operation of the drain valve. 3...Inlet, 4...Outlet, 5...Condensate storage chamber, 6
... Small pore, 7 ... Lodging bucket, 8 ... Inflow channel, 10 ... Drain channel, 11 ... Partition wall, 13 ... Valve seat cylinder, 14 ... Valve hole, 15 ... Drain valve, 20 ...
Valve guide, 21...valve stem, 25...operation lever, 26...eyepiece.

Claims (1)

[Claims] 1. A lodging bucket with an open bottom end and small holes in the top wall is installed in the condensate storage chamber, and the end of the inflow passage communicating with the inlet of the condensate storage chamber is opened toward the inside of this lodging bucket, and the tipping bucket is Self-controlled control of the drain valve, which controls the opening and closing of the valve hole in the valve seat tube attached to the partition wall that separates the condensate storage chamber from the drainage channel leading to the outlet, by changes in the buoyancy of the bucket due to the exchange between gas and liquid phases inside the bucket. In a bell float type gas phase trap that performs
An operating lever is pivoted to a stem of a drain valve that protrudes through the valve guide and faces the top wall of the lodging bucket, one end of which is pivoted to an eyepiece fixed to the top wall of the lodging bucket; A bell float type gas phase trap valve operating device having the other end removably opposed to the lower surface of a valve guide.