JPS6346096Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air filter with an automatic drain discharge device that automatically discharges drain separated from compressed air and collected in a storage tank to the outside.

Conventionally, this type of air filter with an automatic drain discharge device has been developed as shown in Japanese Utility Model Publication No. 12080/1980.
The pilot valve body, which is slidably fitted to the upper part of the rod member installed in the storage tank, is pushed up by the rise of the float to introduce compressed air into the discharge valve, and when the discharge valve opens, the drain is discharged to the outside. I am trying to discharge it to However, since the pilot valve body is pushed up by the rise of the float,
There were drawbacks such as the need for a large buoyant force in the float and the need to provide a large float.

The present invention was developed in view of these drawbacks.
The present invention provides an air filter with an automatic drain discharge device that reduces the buoyancy of a float that operates a pilot valve body and can downsize the float. Therefore, in the present invention, a discharge valve is provided at the bottom of a storage tank that collects drain separated from compressed air to open when compressed air is introduced and discharge the drain to the outside. A communication passage is provided through the rod by opening toward the upper end surface and introducing the compressed air in the storage tank to the discharge valve, and the rod is shaped like a roughly tap with the opening facing downward to form an annular clearance between the rod member and the outer periphery of the rod member. A pilot valve body provided so as to cover the upper part of the member is supported so that the valve part having an inner bottom is brought into contact with the upper end surface of the rod member to close the opening of the communication passage, and the pilot valve body is slidably connected to the pilot valve body. A float is provided externally on the rod member so as to fit freely and to form a vertical clearance between the rod member and the substantially conical opening edge of the pilot valve body, and the float is arranged in accordance with the amount of drain collected in the storage tank. The center of action of the buoyant force is arranged eccentrically with respect to the axis of the rod member so that when it rises, it comes into contact with the roughly tip-shaped opening edge of the pilot valve element, and thereby tilts with respect to the rod member together with the pilot valve element to open the opening of the communication passage. It is designed to reduce the buoyancy of the float that operates the pilot valve body.

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1 to 3, 1 is a main body having an inlet passage 2 and an outlet passage 3, and a transparent storage tank 4.
are connected by a connecting ring 5. A guard 6 protects the storage tank 4 and is provided to surround the storage tank 4. Reference numeral 7 denotes a filter element, on the lower end of which a baffle plate 8 for preventing splashing of drain is fitted and fixed to the main body 1 by a connecting rod 9. Reference numeral 10 denotes a blade member that narrows the flow path of the compressed air from the inlet passage 2 to increase the speed of the jet flow and gives a swirling motion to separate moisture and dirt contained in the compressed air. is held in between. Reference numeral 11 designates a discharge valve that is installed at the bottom of the storage tank 4 with a nut 13 and opens when compressed air is introduced to discharge drain to the outside.
The displacement member 18 is seated on the valve seat 14 by a spring force, and one end of the displacement member 18 has a discharge chamber 1 that communicates with the lower part of the storage tank 4 and communicates with the discharge port 20 when opened.
6, and a pilot chamber 19 communicating with the discharge port 20 via a throttle passage 23 is formed at the other end. 24 is a bar-shaped rod member, and the storage tank 4
It has a guide part 37 that stands upright in the inner lower part and protrudes in the radial direction from the upper part. Reference numeral 25 denotes a communication passage provided through the rod member 24, through which the compressed air in the storage tank 4 is transferred to the discharge valve 1.
The rod member 24 is provided with an opening at the upper end surface so as to be introduced into the pilot chamber 19 of the rod member 24. Reference numeral 27 designates a pilot valve body which has a substantially conical shape and has an opening facing downward to form an annular gap with the outer periphery of the rod member 24 so as to cover the upper part of the rod member 24. Valve part 28 on the inner bottom
The rod member 24 is supported by the rod member 24 so as to close the opening of the communication passage 25 by contacting the rod member 24. Reference numeral 29 denotes a float mounted on the rod member 24 and seated in the lower part of the storage tank 4. A fitting hole 30 into which the pilot valve body 27 is slidably fitted is recessed from the upper surface of the float, and the pilot valve body 27 is inserted into the fitting hole 30. A through hole 32 is connected to the rod member 24, and has a stepped portion 31 that forms a vertical clearance between the rod member 24 and the substantially conical opening edge of the rod member 24. The float 29 rises in accordance with the amount of drain collected in the storage tank 4, and the stepped portion 31 comes into contact with the edge of the roughly concave opening of the pilot valve body 27, so that the float 29, together with the pilot valve body 27, forms a fulcrum 33 with respect to the rod member 24. It has a semi-cylindrical shape so that it can be tilted toward the center to open the opening of the communication passage 25, and the center of action of buoyancy is eccentric to the axis of the rod member 24. Reference numeral 36 denotes a push rod provided on the discharge valve 11 to manually push the displacement member 18.

Next, the operation of this configuration will be explained.

When compressed air flows into the inlet passage 2, the compressed air is sped up and given a swirling motion by the vane member 10, and the condensate contained therein is separated by the cyclone effect, and furthermore, the filter element 7 removes dust. The filtered and clean air flows out from the outlet passage 3, and the separated drain collects in the lower part along the inner wall of the storage tank 4. At this time, the pilot valve body 27 closes the opening of the communication passage 25 with the valve portion 28 due to its own weight and the acting force of the compressed air pressing against the rod member 24, and the float 29 is seated in the lower part of the storage tank 4. As the drain collects, the float 29 is guided by the rod member 24 and rises, and the stepped portion 31 of the float 29 touches the pilot valve body 2.
7, the float 29, together with the pilot valve body 27, tilts in the direction of arrow A about the fulcrum 33 with respect to the rod member 24, thereby opening the communication passage 25. For this reason, storage tank 4
The compressed air inside flows through the communication path 25 and is introduced into the pilot chamber 19, and due to the acting force of the compressed air inside the pilot chamber 19, the displacement member 18 slides against the spring force of the spring 22, and the displacement member 18 is separated from the discharge chamber 16. It communicates with the discharge port 20, and drain flows from the discharge chamber 16 through the discharge port 20 and is discharged to the outside. When the amount of drain collected in the lower part of the storage tank 4 decreases due to drainage of drain, the float 27 along with the pilot valve body 29 tilts in the direction opposite to the direction of arrow A due to its own weight, and the pilot valve body 29 moves toward the rod member 24. The valve portion 28 closes the opening of the communication passage 25 by the force of the compressed air, thereby blocking the introduction of the compressed air into the pilot chamber 19. Since the compressed air introduced into the pilot chamber 19 is gradually discharged to the outside through the throttle passage 23, the acting force inside the pilot chamber 19 drops immediately even when the pilot valve body 27 closes the opening of the communication passage 25. The communication between the discharge chamber 16 and the discharge port 20 is maintained without draining, and the drain continues to be discharged.
9 is guided down by the rod member 24, the drain is completely discharged, and the float 29 is seated at the lower part of the storage tank 4. After that, the displacement member 18 moves between the discharge chamber 16 and the discharge port 2.
0.

In this operation, the center of action of the buoyant force of the float 29 is eccentric to the axis of the rod member 24, so that the float 29, accompanied by the pilot valve body 27,
4, the buoyant force of the float 29 that operates the pilot valve body 27 can be reduced by lever action based on the eccentric distance of the center of action of the buoyant force of the float 29, and the float 29 can be made smaller. In addition, since a vertical clearance is formed between the substantially conical opening edge of the pilot valve body 27 and the float 29, the dimension from the valve portion 28 of the pilot valve body 27 to the substantially conical conical opening edge and the float 29 The pilot valve body 27 is connected to the upper end surface of the rod member 24 through the communication passage 2 so as to be less susceptible to dimensional errors of each member, such as the dimension from the upper surface to the step portion 31.
5 can be supported to close the opening well.

In this way, the present invention provides a discharge valve at the bottom of a storage tank that collects separated condensate from compressed air to open and discharge the condensate to the outside when compressed air is introduced, and a rod installed vertically in the storage tank. A communicating passage is provided through the member so as to open toward the upper end face and introduce compressed air in the storage tank to the discharge valve, and is approximately cup-shaped with the opening facing downward to form an annular clearance with the outer periphery of the rod member. A pilot valve body provided to cover the upper part of the rod member is supported so that the valve part having an inner bottom abuts against the upper end surface of the rod member to close the opening of the communication passage, and the pilot valve body and the pilot valve body slide together. A float is provided on the rod member so as to be movably fitted and to form a clearance in the vertical direction between the rod member and the approximately cone-shaped opening edge of the pilot valve body, and the float corresponds to the amount of drain collected in the storage tank. The center of action of the buoyant force is eccentric to the axis of the rod member so that when it rises, it comes into contact with the roughly tip-shaped opening edge of the pilot valve body, thereby tilting the rod member together with the pilot valve body to open the opening of the communication passage. With this arrangement, the buoyancy of the float that operates the pilot valve body can be reduced. Moreover, since a vertical clearance is formed between the approximately conical opening edge of the pilot valve body and the float, the pilot valve body is not easily affected by dimensional errors in the pilot valve body or the float, and the pilot valve body can be easily attached to the rod member. It is possible to support the opening of the communication path to the upper end face so as to close it well.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view taken along the line--line of FIG. 2. 4... Storage tank, 11... Discharge valve, 24... Rod member, 25... Communication path, 27... Pilot valve body, 28... Valve portion, 29... Float.

Claims (1)

[Scope of utility model registration request] A discharge valve is provided at the bottom of the storage tank that collects separated condensate from compressed air to open and discharge the condensate to the outside when compressed air is introduced, and a rod member installed vertically in the storage tank has an opening toward the upper end surface. A communication passage is provided through the tank to introduce the compressed air in the storage tank to the discharge valve, and the opening is directed downward to form an annular gap with the outer periphery of the rod member to cover the upper part of the rod member. The pilot valve body provided as shown in FIG. A float is provided externally on the rod member so as to form a vertical clearance between the rod member and the approximately conical opening edge of the body, and the float rises in accordance with the amount of drain collected in the storage tank, and the float becomes an abbreviation of the pilot valve body. Equipped with an automatic drain discharge device in which the center of action of the buoyant force is eccentric to the axis of the rod member so that when it comes into contact with the tip-shaped opening edge, the rod member with the pilot valve body tilts to open the opening of the communication passage. air filter.