JPS601519B2 - air trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air trap that automatically discharges condensate generated in a compressed air receiver tank, compressed air transport pipe, etc.

One of the most difficult problems in draining condensate from compressed air piping systems is draining condensate containing high viscosity oil that is mixed in by compressors and oilers.

Conventional air traps equipped with floats use the difference in specific gravity between condensate and air to open and close the valve using the buoyant force acting on the float. It was something that would end up happening.

For this reason, condensate containing high viscosity oil always remains in the trap, and orifices and minute gaps are blocked with high viscosity oil.
They often stopped working shortly after use.

In view of the above circumstances, it is an object of the present invention to provide an air trap that can easily discharge condensate containing high viscosity oil. In achieving the above objective, it is important to completely drain the condensate from each opening/closing operation.

For complete discharge of condensate, the inlet is connected to the entrance and the valve bell body forms a condensate reservoir chamber which is connected to the discharge port through the discharge hole, and a variable pressure chamber is airtightly isolated from the condensate reservoir chamber. However, a fixed wall member fixed to the valve weight body, a pressure-receiving displacement wall member that is displaced according to the pressure within the pressure-receiving chamber, a main valve body that opens and closes the discharge hole according to displacement of the pressure-receiving displacement wall member, and the pressure-receiving displacement chamber. and a first orifice communicating the condensate reservoir chamber;
a sub-valve seat protruding upward from the end of the condensate reservoir chamber of the first orifice; a sub-valve body seated on the sub-valve seat to open and close the first orifice; and a condensate reservoir. A float placed in the room and the wealth as it ascends and descends.

A pipe comprising a valve body supporting member arranged to seat the valve body from the sub-valve seat, and a second orifice that connects the variable pressure chamber and the discharge port side. A flat air trap is suitable. In this case, if the fixed wall member is a cylinder and the pressure-receiving displacement wall member is a piston that slides airtight within the cylinder, it is excellent as a high-pressure air trap.

Furthermore, if the pressure-receiving displacement wall means is formed of a flexible membrane such as a diaphragm or bellows, the sliding resistance will be small and it will be excellent as a low-pressure air trap.

The float may be an open or sealed hollow float, or a synthetic resin float.

If the sub-valve body and the sub-valve body supporting member are connected via an elastic member that urges the sub-valve body toward the sub-valve seat, the first orifice can be reliably closed even against vibrations. Yes, malfunctions are prevented.

In addition, if the above-mentioned float and the sub-valve element supporting member are connected by providing a knot, the first orifice can be opened and closed at the two positions of the float's ascent and descent. is reduced, resulting in excellent durability.

In the above-mentioned pilot type air trap, after the first orifice is closed, the pressure inside the variable pressure chamber is discharged through the second orifice, and it takes a short time until the discharge hole is blocked by the main valve body, which is displaced according to the pressure in the variable pressure chamber. However, it takes time.

With conventional air traps using floats, it was unavoidable that some condensate remained in the condensate reservoir chamber when the valve was closed, but by applying the pilot type described above, the blockage of the first orifice could be avoided. There is a possibility that residual condensate will be discharged completely during the delay time until the discharge hole is blocked.

However, since the delay time is extremely short, complete discharge cannot be achieved unless the amount of residual condensate in the condensate reservoir chamber is kept extremely small when the first orifice is closed.

The residual condensate level when the first orifice is blocked is:
Determined by the float's draft level.

The draft level of a float is determined by the float's own weight. Therefore, floats have conventionally been made of materials with low specific gravity in order to obtain large effective buoyancy, but this has not been sufficient to completely discharge condensate.

In order to achieve the above object, it is further necessary to have a means for reducing the amount of condensate remaining when the first orifice is closed.

The technical means of the present invention taken to achieve the above object is that the pilot type air trap includes a magnet or a breakable member that biases the sub-valve element supporting member in the valve opening direction of the first orifice. A part of the contact portion of the sub-valve body supporting member and the sub-valve body is formed to protrude from the other part, and when the float floats, the sub-valve body is moved to and from the seat using a point of the sub-valve seat as a fulcrum. It is something.

The operation of the above technical means is as follows.

Since the sub-valve body is moved and unseated using one point of the sub-valve seat as a fulcrum, the first orifice can be engaged with a small force, and the float can be one with a small buoyancy, that is, one with a small self-weight. . Therefore, the residual liquid level in the condensate reservoir when the first orifice is closed can be lowered. Here, by biasing the auxiliary valve element supporting member in the direction of the valve of the first orifice using a magnet or an elastic member, the weight of the float, the auxiliary valve element supporting member, the auxiliary valve element, etc. can be offset. , the liquid level in the condensate reservoir can be lowered to a sufficiently low level when the first orifice is closed.

Furthermore, if the float is housed in an internal casing that has a small-diameter closing port on the top and a large-diameter opening on the bottom, the drop in the liquid level inside and outside the casing during discharge will be different, and the drop of the float in the casing will be caused by the drop in the liquid outside the casing. Since it lags behind the descent, the amount of residual condensate when the first orifice is closed becomes even smaller.

Next, the illustrated embodiment will be explained.

1 is the upper pupillary body, and 2 is the lower pupillary body, which together constitute the valve sparrow body.

The upper and lower bonito bodies 1 and 2 are airtightly joined via an O-ring gasket 3. The joint between the upper and lower housings 1 and 2 has an outwardly projecting flange shape and is fixed with several bolts 54. A condensate storage chamber is formed inside by the valve body.

An inlet 4 and a pressure equalization pipe port 5 are provided at the upper part of the upper casing 1, which are open to the condensate reservoir chamber. When this art trap is installed in a compressed air receiver tank, the inlet 4 is connected to the bottom of the tank, and the pressure equalization pipe port 5 is connected to the top of the tank. In addition, when installing the main art trap in the middle of a compressed air transport pipe, the inlet 4 is on the primary side of the transport pipe, and the Hitoshi pipe port 5 is
is connected to the secondary side. A discharge port 6 is provided at the bottom of the undercarriage 2.

The discharge port 6 is connected to a condensate reservoir by a discharge hole 8 provided in the main valve seat member 7. 9 is an annular main valve seat provided at the lower end of the discharge hole 8 and protruding downward.

10 is an O-ring gasket that maintains airtightness between the main valve seat member 7 and the lower bell body 2.

Reference numeral 11 denotes a cylinder member integrally constructed with the main valve seat member 7, and is located within the condensate reservoir chamber.

A notch 12 is provided at the connecting portion between the cylinder member 11 and the main valve seat member 7, and the discharge hole 8 and the inside of the cylinder member 11 communicate with the condensate reservoir chamber through the notch 12. The inside of the cylinder member 11 consists of an upper large-diameter wall and a lower small-diameter wall, which are continuous in a step-like manner at a shoulder 13.

A piston 14, which is a pressure-receiving displacement wall member, is slidably disposed inside.

The piston 14 has a large upper part and a smaller diameter part at the lower part, which are continuous in a stepped manner at a shoulder part 15, and are in sliding contact with the inner large diameter arm and the small diameter wall of the cylinder member 11, respectively. An O-ring packing 16 is interposed between the small recess of the piston 14 and the small inner diameter wall of the cylinder member 11 to keep the sliding portion airtight.

On the other hand, a synthetic resin strip 17 with low sliding resistance is interposed between the large arm portion of the piston 14 and the inner large diameter wall of the cylinder member 11 in an open ring shape to allow ventilation. The lower part of the piston 14 is a small-diameter rod-shaped piston rod that passes through the discharge hole 8 and projects toward the discharge port 6, and a main valve body 18 is attached thereto.

The main valve body 18 is made of synthetic rubber.

The main valve body 18 is of sufficient size to seat on the annular valve seat 9 and close the discharge hole 8 . 19 is a main valve body retainer, two spring washers, and 21 is a locking nut screwed onto the piston rod.

A cylindrical support column 22 is fixed to the upper part of the cylinder section 14.

23 is an O-ring gasket.

In this way, a variable pressure chamber 24 is formed above the piston 14 inside the cylinder member 11. A Liu valve seat 25 is formed at the upper end of the cylindrical support column 22, and a first orifice 26 for communicating the condensate reservoir chamber and the variable pressure chamber 24 is provided.

The variable pressure chamber 24 is a second chamber provided through the piston 14.
The orifice 27 is suitable for discharging 6 legs.

A rib 28 is provided around the cylindrical support column 22, as shown in cross section by an imaginary line (two-dot chain line), and a sub-valve body supporting member is guided thereon.

The wealth. The valve body supporting member includes a sleeve-like member 29 and the member 2.
9 and a large-diameter cylindrical member 30 screwed onto the upper end thereof. The upper end of the sleeve-shaped portion 29 forms a slope. A metal piece 31 that is attracted to a magnet is fixed to the cylindrical member 301 with a snap ring 32. The sub-valve body is composed of a sub-valve part 33 made of synthetic rubber and a disc-shaped sub-valve part holding frame 34 larger than the inner diameter of the sleeve-shaped part village 29, and is supported by a coil spring 35 interposed between the metal piece 31 and the sub-valve part 33. wealth. Valve seat 25
It is elastically biased in the direction. 36 is a ventilation hole.

The sleeve-like member 29 is provided with upper and lower float receiving members 37 and 38 at two upper and lower positions, and four spherical floats 39 are arranged between the two members 37 and 38.

The diameter of the float 39 is the upper and lower parts of the float receiver 37 and 38.
less than the distance between. 53 is a through hole.

A shoulder portion is provided on the inside of the lower part of the sleeve-like member 29, and one end of a coil spring 40 arranged around the cylindrical support column 22 comes into contact with the shoulder portion. There is.

The float 39 is covered by an inner casing 41,42. In this way, the condensate reservoir chamber is formed by the inner casing 41,
42, it is separated into an inner chamber 43 and an outer chamber 44. A large diameter opening 45 is provided at the bottom of the lower member 42 of the inner casing.
On the other hand, a small diameter Sekiguchi 46 is bored in the upper part of the upper member 41,
The inner chamber 43 and the outer chamber 44 are suitable for lotus.

A permanent magnet 47 is attached to the top of the upper member 41 of the inner casing at a position facing the metal piece 31.

48 and 49 are separators placed on the upper and lower surfaces of the magnet 47;
It is fixed by a snap ring 50.

Reference numerals 51 and 52 denote ribs provided on the inner walls of the top coating body 1 and the lower ridge body 2 in order to securely fix the inner casings 41 and 42.

Next, the operation of the above embodiment will be explained.

When there is no condensate in the condensate reservoir chamber, the valve is in the closed state as shown.

That is, the float 39, the sub-valve body carrier village, etc. and wealth. The weight of the valve body etc. overcomes the force of the coil spring 40, so that the sub-valve part 33 is seated on the Liu valve seat 25, and the first orifice 26 is closed. Furthermore, when the first orifice 26 is closed, the differential pressure between the condensate reservoir chamber and the variable pressure chamber 24 acts on the sub-valve element in the valve-closing direction. The inside of the variable pressure chamber 24 is connected to the discharge port 6 side through the second orifice 27, and has a lower pressure than the inside of the condensate storage chamber.
The diameter of the piston 14 is designed to be larger than the diameter of the discharge hole 8, and the differential pressure between the condensate reservoir chamber and the variable pressure chamber 24 exerts an upward force on the piston 14. Therefore, the main valve body 18 is pressed against the annular valve seat 9 and closes the discharge hole 8. In this valve closed state, the valve bell body, the float 39
Even if vibrations are applied to the sub-valve body supporting member, etc., the vibrations are damped by the coil springs 35 and 40, and the Liu valve body does not separate from the Hatakeyama valve seat 25.

Next, when condensate flows in from the inlet 4, it accumulates in the condensate reservoir chamber, and the liquid level rises. Since the rate of rise in the liquid level is slow, the air in the inner chamber 43 flows from the closed opening 46 to the outer chamber 4.
4, and rises while maintaining the same liquid level in both the inner and outer chambers 43 and 44. When the float 39 floats up and comes into contact with the float receiving material 37 to obtain sufficient buoyancy, the sub-valve element is separated from the sub-valve seat 25 via the sub-valve element supporting member, and the first orifice 26 open it. At this time, the coil spring 40 is elastically biasing the sub-valve element supporting member in the upward direction, and the sub-valve part holding frame 34 is moved so that the uppermost straight B point of the upper end slope of the sleeve-shaped part village 29 first moves in the upper direction. , Liu valve seat 25 is oscillated about point A in the illustrated state. Therefore float 39
should be able to provide a small amount of buoyancy. The sub-valve body is the sub-valve seat 2
When the metal piece 31 is unseated from the Hatakeyama valve seat 25, the differential pressure acting on the sub-valve element is released, and the metal piece 31 is attracted to the magnet 47, keeping it largely unseated from the Hatakeyama valve seat 25.

When the first orifice 26 is opened, the air in the upper part of the condensate storage chamber passes through the through hole 36 and the first orifice 26 and into the variable pressure chamber 24.
The pressure inside the variable pressure chamber 24 increases.

When the internal pressure of the variable pressure chamber 24 increases, the piston 14 is pushed down, the main valve body 18 is separated from the annular valve seat 9, and the discharge hole 8 is opened.

The condensate thus accumulated in the condensate reservoir chamber is discharged due to the pressure difference between the condensate sink chamber and the discharge port 6 side.

Due to condensate discharge, the liquid level in the condensate reservoir chamber rapidly decreases.

At this time, since the inner and outer chambers 43 and 44 are communicated through a small-diameter closed opening 46, air inflow from the outer diameter 44 into the inner chamber 43 is restricted, and the drop in the liquid level in the inner chamber 43 is caused by the liquid level in the outer chamber 44. It lags behind the decline in rank. The float 39 descends with the liquid level in the inner chamber 43, but when both the upper and lower float receiving members 37 and 38 are in the non-contact position, the metal piece 31 of the Liu valve body supporting member is attached to the magnet 47.
Since it is adsorbed to the valve, it does not fall, and the sub-valve body becomes rich.

It is maintained in a state separated from the valve seat 25, and the first orifice 26 is open. Only when the float 39 comes into contact with the lower float receiving member 38, the liquid level in the inner chamber 43 is lowered to the lower part of the float 39, and the weight of the float 39 sufficiently acts on the lower float receiving member 38, the sub-valve element supporting member is activated. , the metal piece 31 separates from the magnet 47, overcomes the elastic force of the coil spring 40, and descends, and the sub-valve portion 33 seats on the sub-valve seat 25, closing the first orifice 26. At this moment, the liquid level of the condensate in the outer chamber 44 drops faster than the condensate in the inner chamber 43, and is completely discharged.

In this way, only a small amount of condensate remains in the inner chamber 43. Even when the first orifice 26 is closed, the air in the variable pressure chamber 24 is squeezed and discharged through the second orifice 27, causing the piston 14 to move upward and the main valve body 18 to move up and into the annular valve seat 9. The seating discharge hole 8 is blocked by the first orifice 26
occlusion, delayed for a short time. Therefore, during this time, the inner chamber 43
The small amount of condensate remaining inside is also completely drained out. The air trap of this embodiment is capable of automatically repeating the above operation. As is clear from the description of the above embodiments, according to the present invention, in a pilot type air trap, the amount of condensate remaining when the first orifice is blocked is made extremely small, so that the first orifice is blocked. During the short delay from the time to the closing of the discharge hole, even this minute amount of residual condensate is discharged, resulting in an air trap that is completely discharged every time the opening and closing operation is performed.

Therefore, an air trap can be obtained that can easily discharge condensate containing high viscosity oil, which has been difficult in the past.

[Brief explanation of the drawing]

The figure shows an embodiment of the invention. 1 is the upper cliff body, 2 is the lower cone body, 4 is the inlet, 5 is the pressure equalization pipe mouth,
6 is a discharge port, 8 is a discharge hole, 9 is an annular main valve seat, 11 is a cylinder member, 12 is a notch, 14 is a piston, 16 is an O-ring packing, 18 is a main valve body, 19 is a main valve body retainer ,
22 is a cylindrical support column, 24 is a variable pressure chamber, 25 is a sub-valve seat ~ 2
6 is a first orifice, 27 is a second orifice, 29 is a sleeve-like member, 30 is a cylindrical part, 31 is a metal piece, 33
3 is a sub-valve part, 34 is a sub-valve part holding frame, 35 is a coil spring, and 3
6 is a ventilation hole, 37 and 38 are float receiver upper and lower members, 3
9 is a spherical float, 40 is a coil spring, 41 and 42 are upper and lower members of the internal casing, 43 and 44 are inner and outer chambers of the condensate reservoir chamber, 45 is a large-sized Sekiguchi, 46 is a small-diameter Sekiguchi, 47 is a permanent magnet, 53 is a through hole.

Claims (1)

[Scope of Claims] 1. A valve casing forming a condensate reservoir chamber with an open inlet and communicating with the outlet through a discharge hole, and a variable pressure chamber airtightly isolated from the condensate reservoir chamber. a fixed wall member fixed to the valve casing; a pressure-receiving displacement wall member that is displaced according to the pressure within the pressure-changing chamber; and a main valve body that opens and closes the discharge hole according to displacement of the pressure-receiving displacement wall member; a first orifice that communicates the variable pressure chamber and the condensate reservoir chamber; a sub-valve seat that protrudes upward from the end of the condensate reservoir chamber of the first orifice; 1. A sub-valve body disposed to open and close the orifice, a float disposed within the condensate reservoir chamber, and a float disposed to move the sub-valve body from and to the sub-valve seat as the float ascends and descends. a second orifice that communicates between the variable pressure chamber and the discharge port side; A part of the contacting portion of the sub-valve body supporting member and the sub-valve body is formed to protrude from the other part, and when the float floats, the sub-valve body is swung and unseated using one point as a fulcrum. Air trap. 2. Claim 1, in which the sub-valve body is formed into a disk shape, and a portion of the sub-valve body supporting member that contacts the sub-valve body below the sub-valve body protrudes upwardly from the rest. Air trap as described in section.