JPS597079B2 - float type trap - Google Patents

Description

[Detailed description of the invention] The present invention relates to float traps.

Conventionally, the valve opening force in a float type trap is determined from the valve opening area and the differential pressure between the inlet and the outlet.

In addition, there is a limit to the size of floats that can be manufactured, so in order to open a valve with a large valve opening area, a lever mechanism that increases the buoyant force acting on the float, or a two-seat type or pilot type valve mechanism is required. Requires a complex structure such as

In view of the above circumstances, it is an object of the present invention to provide a float-type trap that has a simple structure and can open a valve with a large valve opening area.

The above purpose is to provide a condensate reservoir chamber with an inlet and an outlet communicating through a valve port, a float placed in the condensate reservoir chamber, and a float trap that opens and closes the valve port by displacement of the float. This can be achieved by a float-type trap in which a back-pressure regulating valve is disposed in the back-pressure chamber to form a back-pressure chamber communicating with the valve port, and the back-pressure chamber is communicated with the condensate reservoir chamber in a throttled state.

The feature of the above structure is that by placing a back pressure regulating valve on the outlet side, the force required to open the valve is determined from the valve opening area and the differential pressure with the inlet back pressure chamber. By the way.

The float-type trap that is the subject of the present invention is one that opens and closes using buoyancy based on the difference in specific gravity of the fluid, and can be used regardless of whether it uses an open float or a closed float, or whether it uses a lever mechanism or a single-seat valve. , a two-seat valve, a pilot valve, or other valve mechanism may be used.

In addition to back pressure control valves that are based on the elastic force of an elastic body as in the embodiments below, there are also back pressure control valves that adjust the back pressure by adjusting the opening area of a throttle valve or the like.

Furthermore, the above-mentioned back pressure regulating valve may be built inside the trap housing, or may be constructed separately from the trap and attached to the outlet side of the trap.

Furthermore, as a means for communicating the condensate reservoir chamber and the back pressure chamber in a constricted state, it is possible to use a fixed orifice as shown in the embodiment below, a variable orifice, a method in which a slit is provided in the valve seat, or a method in which the valve seat and the valve body are provided with a slit. The sealing surface may be roughened to allow fluid to leak.

The following description will be made based on the illustrated embodiment.

In FIG. 1, reference numeral 1 denotes a main body, which is secured by tightening means (not shown) such as upper lid bolts and nuts to form a casing.

3 is a gasket. Reference numeral 4 denotes a condensate reservoir chamber formed within the housing, with which an inlet 5 communicates.

Reference numeral 6 denotes a partition wall provided between the inlet 5 and the condensate reservoir chamber, which prevents the impact force of the inflowing condensate from acting directly on the inside of the condensate reservoir chamber 4.

7 is a pore.

8 is a back pressure chamber, which communicates with the condensate reservoir chamber 4 through a valve port 9;
It is separated from the outlet 11 by a back pressure regulating valve 10.

12 is a valve seat forming a valve port, and 13 is an orifice that communicates with the condensate reservoir chamber 4 and the back pressure chamber 8 in a throttled state.

The back pressure regulating valve is housed inside a housing, and includes a valve seat 14, a valve body 15 facing the valve seat 14 from the outlet 11 side, and a spring 16 that urges the valve body 15 toward the valve seat 14. , a spring receiver, and a spindle 1T that adjusts the elastic force of the spring 16 by external screw operation.

Reference numeral 18 denotes a spherical float placed freely in the condensate reservoir chamber 4, which floats and descends in accordance with the liquid level within the condensate reservoir chamber 4, and directly opens and closes the valve port 9.

19 is a float seat that stops the float 18 from falling.

In the float type trap of the above embodiment, first, the elastic force of the spring 16 of the back pressure regulating valve 10 is adjusted so that the valve opens only when the pressure inside the back pressure chamber 8 reaches a predetermined level or higher.

Further, the area of the valve port 9 is set to be large enough to open when the pressure in the back pressure chamber 8 increases and a predetermined pressure difference occurs.

Further, the discharge amount discharged from the orifice 13 into the back pressure chamber 8 is set below the lower limit of the flow rate of condensate, thereby preventing gases such as steam from being discharged from the orifice.

The operation of the above embodiment will be explained below.

When the amount of condensate flowing in from the inlet 5 is small and the pressure in the back pressure chamber 8 is low, the float 18 moves toward the valve seat 12 as shown by the solid line.
The valve is in a closed state.

Condensate continues to flow in from the inlet 5, the liquid level in the condensate reservoir chamber 4 rises, and the pressure in the back pressure chamber 8 gradually increases due to the condensate discharged from the orifice 13.

When the pressure in the back pressure chamber 8 increases and the differential pressure with the inlet 5 side pressure becomes less than a predetermined value, the float 18 is separated from the valve seat 12 due to the buoyant force acting on the float 18, as shown by the two-dot chain line in the figure. It floats up and opens the valve port 9.

When the valve port 9 is opened, the pressure in the back pressure chamber 8 is further increased instantaneously, and the back pressure regulating valve 10 is activated by the spring 1 due to this pressure increase.
The valve is opened against the elastic force of 6, and the condensate is discharged to the outlet 11 side.

When the condensate that has flowed into the condensate reservoir chamber 4 is discharged by opening the valve port 9 and the liquid level in the condensate reservoir chamber 4 decreases, the float 18 descends and is attracted to the valve seat 9 and closes the valve port 9. close.

The pressure in the back pressure chamber 8 decreases as the valve port 9 closes, and when it becomes equal to or less than the opening set pressure of the back pressure regulating valve 10, the pressure in the back pressure chamber 8 is closed again, returning to the state before operation.

Thereafter, the same action is repeated.

Here, in this embodiment, the force required to open the valve port 9 is determined from the valve port area and the differential pressure between the inlet 5 and the back pressure chamber 8 pressure, so the conventional valve port area and Compared to a valve whose opening force is determined from the pressure difference between the inlet and the outlet, the valve can be easily opened with a large valve opening area without using a complicated mechanism, and a large amount of condensate can be discharged.

FIG. 2 shows another embodiment, and its features are as follows:
The back pressure control valve is constructed separately from the trap and is attached to the outlet side of the trap.

Further, it performs the same function as the embodiment shown in FIG. 1 above.

21 is the main body, 22 is the upper lid, 23 is the gasket, 24 is the condensate storage chamber, 25 is the inlet, 26 is the partition wall, 27 is the air hole, 28
29 is a valve port, 32 is a valve seat, and 33
is an orifice, and 34 is a float.

Moreover, FIGS. 3 and 4 show an example of the back pressure regulating valve 30 attached to the above embodiment.

In Fig. 3, 41 is the valve housing, 42 is the inlet 43,
A partition separating the outlet 44, 45 a valve port, 46 a valve body, 4
7 is a spring, 48 is a spring receiver, and 49 is a spindle.

In Fig. 4, 51 is the valve housing, 52 is the inlet, and 53 is the valve housing.
54 is a valve seat, 54 is a valve body, 55 is a spring, 56 is a rib, 57 is a spring receiver, and 58 is an outlet.

In this way, in the float-type trap of the present invention, the back pressure control valve is disposed on the outlet side, and the back pressure chamber and the condensate reservoir chamber are communicated in a throttled state, so that the inlet and the back pressure chamber can be connected to each other. Since the valve opening is opened based on the differential pressure between the inlet and the outlet, it is possible to open the valve opening with a much larger area with a simpler structure than the conventional valve opening based on the differential pressure between the inlet and the outlet.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, FIG. 2 shows another embodiment, and FIGS. 3 and 4 show an example of a back pressure regulating valve used in the embodiment of FIG. 1, 21 are the main body, 2, 22 are the upper lid, 3, 23 are the gaskets, 4.24 are the condensate reservoir chamber, 5.25 are the inlets, 6, 26
1 is a partition, 7 and 27 are air holes, 8 is a back pressure chamber, 9 and 29 are valve ports, 10 and 30 are back pressure control valves, 11.31 is an outlet, 12.
32 is a valve seat, 13.33 is an orifice, 18.34 is a float, and 28 is an outlet passage.

Claims (1)

[Claims] 1. A float type trap is provided with a condensate reservoir chamber whose outlet communicates through the condensate reservoir chamber and a valve port, and a float is arranged in the condensate reservoir chamber, and the valve port is opened and closed by the displacement of the float, with back pressure on the outlet side. A float type trap in which a control valve is arranged to form a back pressure chamber communicating with a valve port, and the back pressure chamber and a condensate reservoir chamber are communicated in a throttled state.