JPH03177699A - Free float type trap - Google Patents

Abstract

PURPOSE:To prevent erosion of inner wall of an outlet passage by forming the inner wall surface of the outlet passage with which condensed water flow flowing out from a valve port collides directly in such an angle that the center axis of the valve port is made to reflect nearly to the center axis direction of the output passage, and still more, forming the center of the inner wall surface to a spherical surface of a concave shape. CONSTITUTION:High speed condensed water flow flowing out from a valve port 38 collides with a concave shape spherical surface part 42 opposed to the valve port 38, of the inner wall surface of an output passage 39. The collided condensed water flow flows along the spherical surface, separates from the spherical surface part 42 as being slowly converted in the direction of the flow, rises in the outlet passage 39, and goes to the outlet 22. At this time, the condensed water flow is converted in the flow direction thereof to nearly the same direction as the center axis of the outlet passage 39 by the spherical surface 42, and flows without collision with the inner wall of the outlet passage 39. Moreover, the condensed water flow flowing in the spherical surface 42 flows smoothly in a nearly laminar flow stage, therefore the same does not erode the spherical surface 42 remarkably.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention has a valve chamber that communicates with an outlet through a valve port, and floats and descends in accordance with the water level of condensate accumulated in the valve chamber, directly touching the valve port with its own surface. A spherical float valve that opens and closes is placed in a free state,
This invention relates to a free float type trap that automatically discharges condensate generated in a pressurized steam system or pressurized air system. In a free float type trap, the float itself serves as the valve body, and there is only one operating part, so the structure is extremely simple and has the characteristics of fewer failures.

<Prior art> A free float trap has an entrance or opening above the valve chamber.
Generally, a valve opening is provided at the bottom of the valve chamber, and the valve opening communicates with an outlet provided on the same axis as the inlet through an outlet passage in the trap housing. As shown in the figure.

A lid member 10 is attached to a main body 11 having an inlet 1 and an outlet 2 to form a trap housing, a valve chamber 3 is formed inside, and a spherical float valve 4 is disposed in a free state. A valve seat member 6 is airtightly attached to the lower part of the valve chamber 3 with an O-ring 7 interposed therebetween, and held by a plug 8.

A valve port 5 opening into the valve chamber is formed in the valve seat member 6 and communicated with the outlet 2 through an outlet passage 9.

Condensate flowing in from the inlet 1 accumulates in the valve chamber 3, and the float valve 4 rises and falls according to the water level to open the valve port 5, and the condensate in the valve chamber is discharged through the outlet passage 9 to the outlet 2. leaks to. The flat part 12 of the plug 8 is made of a harder material than the main body 11 because it is directly hit by the condensate flow discharged from the valve port 5.

<Problems to be Solved by the Invention> In the above-mentioned free-float trap by Sei, since the flat part 12 of the plug 8 is formed perpendicular to the central axis of the valve port 5, the outlet passage is connected from the valve port 5. The condensate flow flowing out to the valve port 9 collides with the flat part 12 of the plug 8, and a flow that tries to rebound toward the valve port 5 is generated again. Therefore, the flow of condensate water between the valve port 5 and the flat part 12 becomes turbulent, and the direction is changed to the outlet passage 9 side as shown by the two-dot chain line.

However, the converted condensate flow impinges on the inner wall surface 13 of the outlet passage 9, significantly erodes that part, and finally penetrates the wall of the main body 11 forming the outlet passage 9, rendering the main body 11 unusable. This causes a significant reduction in the lifespan of the trap.

Therefore, a technical object of the present invention is to provide a free-floating trap that has a long life and the inner wall of the trap housing is not eroded by the condensate flowing out from the valve port.

Means for solving the above problems> The technical means of the present invention taken to solve the above problems are as follows:
A trap housing with an inlet and an outlet formed at the top and a valve chamber inside, a valve seat member placed at the bottom of the valve chamber and with a valve opening in the center, and a trap housing that has an inlet and an outlet formed in the upper part and a valve seat member located at the bottom of the valve chamber with a valve opening in the center. A float valve is placed freely inside the valve chamber to open and close the valve opening by floating up and down and coming into direct contact with the valve seat member. In a free-floating trap that connects the outlet and guides condensate in the valve chamber to the outlet, the inner wall surface of the outlet passage where the condensate flowing out from the valve orifice directly collides with the center of the valve orifice. The shaft is formed at an angle that reflects the direction of the approximately central axis of the exit passage, and the center of the inner wall surface is shaped into a concave spherical surface! It is something that has been torn down.

The inner wall surface portion of the outlet passage with which the condensate flowing out from the valve port directly collides may be formed of another member harder than the trap housing, and the member may be formed into a concave spherical shape and attached from the outside.

Effects> The effects of the above technical means are as follows. The high-speed condensate flow flowing out from the valve port collides with a concave spherical surface on the inner wall surface of the outlet passage facing the valve port. The impinging condensate flow flows along the spherical surface, leaves the spherical surface portion while being gradually changed in direction, and ascends the outlet passage toward the outlet.

At this time, the flow direction of the condensate flow is changed by the spherical surface to substantially the same direction as the central axis of the outlet passage, and flows without colliding with the inner wall of the outlet passage. Furthermore, since the condensate flow flowing through the spherical surface flows smoothly in a nearly stream-like state, it does not significantly erode the spherical surface.

<Example> An example showing a specific example of the above technical means will be described. (See Figures 1 and 2) This embodiment is applied to a steam trap for discharging condensate from a pressurized steam system.
The lid 24 is fixed with bolts 25 through 8 to secure the trap housing. A valve chamber 23 is formed within the trap housing, and a strainer 26 is passed upward to open the inlet 21. The strainer 26 is a cylindrical member 30 having a frontage 29 on the circumferential side.
A cylindrical screen 31 is integrally formed at the bottom of the screen, and the lowermost end is sealed with an end member 32. The strainer 26 is inserted from the upper exterior of the main body 20 so as to cross the passage from the inlet 21, and the screen 31 is inserted into the valve chamber 2.
Place it so that it protrudes from the top of 3. The lower end thereof is engaged with a protrusion 33 in the valve chamber, and the screen holder 27 is screwed onto the main body 20 from above to fix the entire strainer 26. At this time, the screen 31 is disposed approximately above the right half of a float valve 34, which will be described later. Condensate flowing from the inlet 21 flows into the inside of the strainer through the two openings and descends, and foreign matter such as dust is removed on the inner surface of the screen 31 before flowing down into the valve chamber 23.

When cleaning the screen 31, it can be easily done by removing the screen holder 27.

A valve seat member 36 is screwed and attached to the lower side surface of the valve chamber 23 from the inside of the valve chamber via a gasket 37. A valve port 38 that opens into the valve chamber 23 is formed in the valve seat member 36, and the diameter of the valve port 38 increases toward the outflow direction to reduce resistance to passage of fluid.

An outlet 22 is formed on the same axis as the inlet 21 at the upper part of the main body. Outlet 22 extends downwardly through outlet passage 39 and communicates with valve chamber 23 through said valve port 38 . The inlet 21 and the outlet 22 are each formed with a female thread for piping.

At the lower part of the outlet passage 39, a plug 41 is screwed and attached from the outside of the main body to a portion where the condensate flow flowing out from the valve port 38 collides. The plug 41 is made of a harder material than the main body 20 to resist erosion by the condensate flow impinging from the valve port 38. Further, a concave spherical surface 42 is formed at the tip of the plug 41.

This spherical surface 42 is formed as follows. First, place the flat part 43 of the plug 41 at the center of the valve port 38 +! 1140 is arranged so as to face substantially toward the central axis 44 of the outlet passage 39. That is, the central axis 40 of the valve port 38 and the approximately central axis 44 of the outlet passage 39 are arranged so that the angles O formed with the plane portion 43 are approximately equal.

Next is the machining of the spherical surface 42, whose diameter
The groove is large enough to receive the entire flux 50 of the condensate flow flowing out from the outlet passage 39, and the tangent line 45 at the upper part thereof is processed to be substantially parallel to the central axis 44 of the outlet passage 39. Machining the spherical surface 42 on the plug 41 as in this embodiment is easier than machining the main body, and also
1 is attached to the main body by screwing, the spherical surface 42 is at the optimum position no matter where it stops. Moreover, if the plug 41 becomes eroded, it can be restored by simply replacing the plug itself.

A hollow, spherical float valve 34 made of a thin stainless steel plate is accommodated in the valve chamber 23 in a free state.

Float seats 35a and 35b are formed on the bottom surface of the valve chamber 23 in parallel with the central axis 40 of the valve port 38 to guide and hold the float valve 34 to the valve port 38 when the valve is closed.

That is, when the float valve 34 descends to close the valve port 38, the float valve 34 is in the position of the float seat 35a.

b comes into contact with the three points (B, C, D) at the tip of the valve seat member 36, and a complete seal can be achieved.

Reference number @46 is a bimetal piece, which is formed into a substantially U-shaped cross section and is attached to the main body 20 with a screw 47. It deforms at low temperatures, displacing the float valve 34 from the valve seat member 36, and opening the valve port 38.
The initial low-temperature condensate and air are forcibly discharged, and when the temperature rises, it contracts (the state shown in FIG. 2) and no longer participates in the float 34.

The action of the above free float type trap is as follows. Condensate from the inlet 21 passes through the strainer 26 to the valve chamber 2.
3. The float valve 34 floats up and down depending on the level of condensate accumulated in the valve chamber 23, and the opening degree of the valve port 38 is adjusted according to the amount of condensate flowing, thereby performing a continuous condensate discharge operation.

Since the screen 31 is disposed above the substantially right half of the float valve 34, the condensate flowing down hits the surface of the substantially right half of the float valve 34. As a result, the float valve 34
The valve member receives fluid force in a direction away from the valve port 38, that is, to the left, and is moved away from the valve seat member 36. float valve 34
The opening degree of the valve port 38 increases as a result of the valve being moved away from its seat, and the discharge flow rate of condensate increases accordingly. Conversely, if the condensate flowing down from the screen 31 hits approximately the left half of the float valve 34, the float valve 34 will receive a force directed toward the valve port 38, which will prevent the float valve 34 from floating and prevent the condensate from floating. The discharge flow rate of water will decrease.

When the float valve 34 floats to open the valve port 38, the valve port 38 opens.
The high-speed condensate flow t flowing out from the plug 41 impinges on a concave spherical surface 42 formed in the plug 41 . The impinging condensate flow flows along the spherical surface and leaves the spherical surface 42 while being gradually changed in direction and ascends the outlet passage 39 towards the outlet 22. At this time, the flow direction of the condensate flow is changed by the spherical surface 42 to substantially the same direction as the central axis 44 of the outlet passage 39, so that it flows without colliding with the inner wall of the outlet passage 39.

In the embodiment described above, the flow velocity of the condensate flow exiting the spherical surface 42 is sufficiently lower near the top of the outlet passage 39 than at the valve opening, so that it does not erode the upper surface 48 of the outlet passage 39.

However, if further safety measures are taken to prevent erosion of the upper surface 48, the plug 41 in the embodiment of the pond is erected a little more, that is, the tangent 45 of the spherical surface 42 is connected to the outlet passage 3.
The plug 41 may be arranged so as to face the curved portion 49 on the upper left side of the plug 9 . As a result, the condensate flow exiting the spherical surface 42 enters the large curved curvature 49 on the upper left side of the outlet passage 39, and the flow direction is changed along the large curvature and flows out to the outlet 22. Therefore, the curvature part 49
This has the effect of reducing erosion caused by condensate flow.

<Effects of the Invention> According to the present invention, since the condensate flow whose direction has been changed by the spherical surface does not collide with the inner wall of the outlet passage, the inner wall of the outlet passage is no longer eroded, and therefore the trap housing as a whole becomes unusable. This problem can be solved and a long-life free-float trap can be provided.

In addition, in conventional models, the fluid flowing out from the valve port collides with the outlet passage surface facing the valve port, creating a turbulent flow.
According to the present invention, the direction of the fluid flow is changed smoothly, so that the fluid flow becomes a substantially laminar flow.

Therefore, the pressure loss of the fluid is reduced, and the pressure difference between the primary side and the secondary side of the valve port is accordingly larger than in the conventional case, and as a result, the discharge flow rate of condensate is increased.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a free float trap 1 to trap showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line 8-A in Fig. 1, and Fig. 3 is a sectional view of a conventional free float trap. It is a diagram. 0 2 6 6 9 2 Main body outlet strainer Valve seat member Outlet passage Spherical surface 1 3 4 8 1 Inlet valve chamber Float valve Valve port plug

Claims (1)

[Claims] 1. A trap housing with an inlet and an outlet at the top and a valve chamber inside, a valve seat member placed at the bottom of the valve chamber with a valve opening in the center, and the water level of condensate accumulated in the valve chamber. A float valve is placed in a free state inside the valve chamber to open and close the valve opening by floating up and down and coming into direct contact with the valve seat member, and the valve opening at the bottom of the valve chamber and the top of the trap housing. In a free float type trap consisting of an outlet passage that communicates the formed outlet and guides the condensate in the valve chamber to the outlet, the inner wall surface of the outlet passage, which the condensate flow flowing out from the valve opening directly collides with, is connected to the valve opening. A free-float type trap, characterized in that the central axis of the trap is formed at an angle such that the central axis of the trap is reflected substantially in the direction of the central axis of the exit passage, and the center of the inner wall surface of the trap is formed as a concave spherical surface.