KR20010045827A - Spool directional control valve - Google Patents

Abstract

PURPOSE: A spool type changeover valve is provided to have a pilot valve in one, to be convenient to assemble by fixing each component to keep a button at the state of fixing by pushing and turning a button manually, to correspond to either a 110-volt alternating current or a 220-volt alternating current and to connect with power sources directly without additional parts. CONSTITUTION: A spool type changeover valve comprises: a pilot valve box(34) equipped with a cylinder(36) and a pilot room(38) communicating with each other, a P-line connecting passage having an outlet(46) on an inner surface(38a) of the pilot room and an exhaust passage(48); a piston inserted into the cylinder; an exhaust pilot(76) put into the pilot room and modeled with an outlet(50) connected to the exhaust passage(48) on the opposite surface to the outlet of the pilot room, a through hole on the both sides of the outlet and a cylindrical groove on the front; a flange packing guide inserted into the cylindrical groove of the exhaust pilot to be slidable and equipped with an open-cut groove, a hole on the center and a projection extended through the through hole of the exhaust pilot and projected to the rear of the exhaust pilot; a flange packing inserted into the hole of the flange packing guide, interposed between the outlet of the inner surface of the pilot room and the outlet of the exhaust pilot to be movable and pushed to the rear by a spring; and a flange(77) located on the rear of the exhaust pilot and contacted with the projection of the flange packing guide to be pushed to the front by a spring and to be movable to the rear by a solenoid.

Description

Spool type switching valve {SPOOL DIRECTIONAL CONTROL VALVE}

The present invention relates to a pilot drive spool type switching valve, and more particularly, to a pilot drive spool type switching valve which consists of a body of a pilot valve box and which can be connected to a power supply of two kinds of supply AC voltages.

The switching valve is usually composed of a male valve and a pilot valve, and is also called a solenoid valve or a solenoid valve. Examples of such a valve include the valves disclosed in Korean Patent Nos. 216970, 216969, 193035, and Utility Model Registration 130580. Valves of this kind must be precise in their operation. In addition, due to the large number of parts, the assembly cost is easy to reduce production costs and reduce defects. In such a point, it is attempted to integrate the pilot valve comprised as two separate bodies conventionally. However, assembling is difficult and many defects have not been successful in terms of reliability. In addition, it is necessary to improve the manual operation button part in order to achieve convenience and certainty of manual operation of the switching valve.

On the other hand, the power supply in the conventional switching valve has been produced so that the product can be connected only to a power of a certain voltage. In other words, when using AC power, AC 110V switching valve and AC 220V switching valve were produced respectively. This requires double management in production, which reduces productivity. On the other hand, if one type of demand forecast is wrong, inventory may accumulate. Therefore, there is a need for an invention of a switching valve that can cope with AC 110V and 220V simultaneously. In addition, some types of switching valves require a separate connector in the form of a socket of a certain standard. This socket type connector provides a line to connect to the power supply line and has a lamp on the connector to indicate whether it is operating. However, since these sockets are separate components, the structure is complicated and not easy to manage. Therefore, it is required to develop a switching valve having a structure in which a lamp can be driven in use while being able to directly connect a wire to a power source without a separate socket.

Accordingly, it is an object of the present invention to provide a switching valve having an integrated pilot valve of a structure that is easy to assemble and that the operation is sure.

Another object of the present invention is to provide a switching valve having a simple button structure and easy to use manual operation button.

Another object of the present invention is to provide a switching valve having a power supply device having a structure capable of directly connecting to a power source while being able to cope with any of the AC power sources 110V and 220V.

1 is a longitudinal cross-sectional view of a spool type switching valve according to an embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional view of the pilot valve of the switching valve shown in FIG. 1 and illustrates different operating states up and down with respect to the center line of the pilot valve. FIG.

3 is an exploded perspective view of the pilot valve shown in FIG.

4 is a left side view and a right side view of the pilot valve box shown in FIG.

FIG. 5 is a cross-sectional view showing a coupling relationship between a plunger packing guide, an exhaust pilot and a plunger of the pilot valve shown in FIG.

FIG. 6 is a view showing a relationship between a manual operation button and a plunger during the manual operation of the pilot valve shown in FIG.

7 is a circuit diagram of a power supply device of the spool type switching valve of FIG.

* Explanation of symbols for the main parts of the drawings

10: switching valve 12: main valve

14: pilot valve 16: electromagnetic drive

18: power supply

In order to achieve this object, the present invention provides a switching valve having a pilot valve provided with a plunger driven by a solenoid, the pilot valve is

A pilot valve box having a piston seal and a pilot seal communicating with each other, having a P-line connecting passage having an outlet at an inner side of the pilot seal, and having an exhaust passage;

A piston inserted into the piston seal;

An exhaust pilot inserted into the pilot chamber and connected to the exhaust passage on a surface facing the outlet of the pilot chamber, through-holes formed at both sides of the outlet, and having a cylindrical groove at the front; ,

A sliding groove is inserted into the cylindrical groove of the exhaust pilot and is provided with a notch groove for communicating back and forth, and a hole is formed in the center, and extends through the through-hole of the exhaust pilot to protrude toward the rear of the exhaust pilot. With a plunger packing guide,

A plunger packing inserted into a hole of the plunger packing guide and movably fitted between an outlet of an inner surface of the pilot chamber and an outlet of the exhaust pilot and pushed back by a spring;

A plunger positioned at the rear of the exhaust pilot, the tip of which is in contact with the projection of the plunger packing guide, pushed forward by the spring and moved backward by the solenoid;

It provides a switching valve, characterized in that provided.

According to another aspect of the present invention, in the switching valve is driven by the solenoid and provided with a power supply for supplying a direct current power to the solenoid from an external AC power source,

The power supply device includes a rectifier circuit unit for converting AC power into DC power by a stop value;

A first terminal line connected to the rectifier circuit part and connected to a voltage drop resistor for a first AC voltage;

A second terminal line which is a common terminal line,

A switching valve is provided, which is connected to the first terminal line at the rear of the voltage drop resistor and has a third terminal line for a second AC voltage having a voltage lower than the first AC voltage.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the switching valve 10 includes a main valve 12, a pilot valve 14, an electromagnetic drive unit 16, and a power supply device 18.

The main valve 12 has a main valve box 20, in which a spool 22 is mounted. P line 24 to which pneumatic air is supplied is provided in the lower part, and R1 line 26 and R2 line 28 which pneumatically escapes are provided as needed. On the other hand, the upper part of the box 20 is provided with an A line 30 and a B line 32 respectively connected to both spaces divided by a piston (not shown) of a pneumatic cylinder (not shown). Such a structure of the main valve 12 will be understood by those skilled in the art.

The pilot valve 14 is attached to the main valve 12. 1, 2 and 3, the pilot valve 14 has a pilot valve box 34. The pilot valve box 34 is formed with a piston seal 36 drilled toward the main valve 12 and a pilot seal 38 drilled toward the electromagnetic drive unit 16. As shown in FIG. 4, the piston seal 36 and the pilot seal 38 communicate with each other through the through holes 40 which are drilled on both sides of the center portion. That is, it is drilled between the inner surface 36a of each piston seal 36 and the inner surface 38a of the pilot seal 38.

The pilot chamber 38 communicates with a P line passage 24a connecting from the P line 24, with the outlet 46 extending toward the inner side 38a of the pilot chamber 38. Again, in detail, in the center of the inner surface 38a of the pilot chamber 38, a cylindrical first bulge 42 and a second ridge provided in a conical shape in the center of the first ridge 44 ( 44). An outlet 46 of the P-line passage 24a is provided in the center of the second ridge 44 (not shown in FIG. 3 but shown in detail in FIG. 2).

On the other hand, the exhaust passage 48 is provided in the pilot box 34. The outlet 50 of the exhaust passage 48 is directed to the lower surface 52 of the pilot chamber 38. The exhaust passage 48 is connected to the exhaust passage of the exhaust pilot, which will be described later. The pilot box 34 is provided with a button insertion hole 58 into which the manual operation button described later is fitted. The button insertion hole 58 penetrates from the top to the upper surface 60 of the pilot seal 38. The pilot box 34 may be made of engineering plastic resin, and in particular, preferably made of PBT material.

The piston 62 is fitted into the piston seal 36 of the pilot box 34. The piston 62 is connected to the spool 22 of the main valve 12 to move the spool 22. The piston 62 has a spool connecting projection 64 in the front, a flange 66 in the middle, and a cylindrical portion 68 for inserting the packing in the rear. The piston packing 70 is inserted into the cylindrical portion.

The plunger packing 72, the plunger packing guide 74, and the exhaust pilot 76 are inserted into the pilot seal 38. In addition, the plunger 77 is movably installed while being guided by the plunger guide 78. The manual operation button 80 is inserted into and fitted into the button insertion hole 58.

Hereinafter, these components will be described in detail. The pilot chamber 38 is fixed with an exhaust pilot 76 inserted therein. According to the shape of the pilot chamber 38, the exhaust pilot 76 has a cross-section in which the sections facing each other in the diagonal direction of the arc are connected to the circumference-string-circumference-string. Therefore, the upper and lower parts are provided with the flat part 82, and the circular arc part 84 is provided in both sides. In the front, a cylindrical groove 85 into which the plunger packing guide 74 is fitted is dug. In the center of the inner surface 86 of the cylindrical groove 84, a ridge 88 in the form of a truncated truncated cone is formed. At the center of the ridge 88 is an outlet 89a of the exhaust passage 89 which is connected to the exhaust passage 48 of the pilot valve box 34 during assembly.

As can be seen with reference to FIG. 5, through holes 90 are drilled on both sides of the ridge 88, which extends to a cylindrical groove 92 into which the tip of the plunger 77 described later is inserted. (Through hole is not shown in FIG. 3, but those skilled in the art will understand with reference to FIG. 5).

At the rear of the exhaust pilot 76 is a cylindrical groove into which the tip of the plunger 77 is inserted. On the other hand, a part of the upper planar portion 82 of the exhaust pilot 76 is cut out to expose the upper end of the plunger 77, and the lower end of the manual operation button, which will be described later, enters the cut-out space. The exhaust pilot 76 may be made of an engineering plastics material, and in particular, it is preferable to manufacture by injection molding with a polyacetal resin.

1, 2, 3, and 5, the plunger packing guide 74 is slidably inserted into the front cylindrical groove 85 of the exhaust pilot 76. The guide 74 has a cylindrical body 94. The outer side of the body 94 is provided with four notched grooves 96 extending in the longitudinal direction and spaced apart at regular intervals in the circumferential direction. A hole 98 is formed in the center of the guide 74. The hole 98 consists of the large diameter part 100 and the small diameter part 102 of the back.

On the back of the body 94, two projections 104 protrude on both sides. This protrusion 104 extends through the through hole 90 of the exhaust pilot 76 (see FIG. 5) and touches the tip of the plunger 77. As a result, the pushing back by the plunger 77 is restricted. The guide 74 may be made of engineering plastic resin, and particularly preferably made of polyacetal resin material.

The plunger packing 72 is slidably fitted into the hole 98 of the guide 74. The plunger packing 72 has a flange 106 fitted into the large diameter portion 100 of the hole 98 of the guide 74, a cylindrical tip portion 108 protruding forward of the flange, and a small diameter portion projecting backwards. A cylindrical rear end 110 fitted to the 102 is provided. The distance between the front end 112 of the plunger packing 72 and the rear end 114 of the rear end 110 of the plunger packing 72 is equal to the distance of the second convex ridge 44 of the pilot seal 38 of the pilot valve box 34. It is less than the distance between the end face and the end face of the truncated conical ridge 88 of the exhaust pilot 76. Thus, the plunger packing can be reciprocated between the end faces of each of the ridges 44 and 88.

A plunger packing spring 116, which is a coil compression spring, is installed between the inner face 38a of the pilot seal 38 and the front face 112 of the tip 108 of the plunger packing 72 to push the plunger packing 72 backwards. . The plunger packing 72 may be made of a rubber material and is particularly preferably made of HNBR material.

The plunger 76 guided by the plunger guide 78 has its tip fitted to the rear of the exhaust pilot 76. The plunger 77 is cylindrical, has a hole in the center, and is always pushed forward by the plunger spring 118 which is a compression coil spring. The plunger spring 118 pushes the plunger 77 more strongly than the plunger packing spring 116.

The manual operation button 80 is inserted into the button insertion hole 58, and its lower end is inserted into the cutout space of the exhaust pilot 76 as described above. 1, 2, 3, and 6, the manual operation button 80 is cylindrical, the lower end portion 120 is inclined by the corner chamfered. The driver groove 122 is provided at the top. The first cut groove 124 is cut in the upper half of the size is provided. A second cutout groove 126 is connected to the upper side of the first cutout groove 124 and cut into a fan shape at a 90 degree angle. The first cutout groove 124 and the second cutout groove 126 are generally vertical, and the second cutout groove 126 is provided at an upper portion of the first cutout groove 124. The vertical width of the second cutout grooves 126 is slightly larger than the pin 128 fitted in these cutout grooves. The vertical width of the first notched groove 124 determines the stroke in which the manual operation button 80 moves. It will be appreciated by those skilled in the art that the stroke is determined to be able to move the plunger by a sufficient distance in contact with the plunger 77 as shown in FIG. 6. The manual operation button 80 is always pushed upward by the button spring 130, which is a compression coil spring, but the pin 131 fixed to the pilot valve box 34 and the lower side of the first cut-out groove 124 It does not fall out because it is in contact.

As shown in FIG. 6, when the button 80 is pushed down, the plunger 77 moves back. At this time, when the button 80 is rotated by 90 degrees, the pin 131 is fitted into the second notch groove 126, and the plunger 77 is prevented even if the button 80 is not pressed to prevent the button 80 from rising upward. It is pushed back.

Referring to FIG. 1, the electromagnetic driver 16 includes a solenoid 16a. When a current flows through the solenoid 16a, the plunger 77 is attracted to the attractive force of the solenoid 16a.

Referring to FIG. 7, the power supply device 300 includes a first terminal line 302, a second terminal line 304 and a third terminal line 306 which are common terminal lines. When supplying AC 220V, a power source is connected between the first terminal line 302 and the second terminal line 304. When supplying AC 110V, a power supply is connected between the second terminal line 304 and the third terminal line 306. The voltage drop resistor WR1 is connected to the first terminal line 302 in series, and at the next point B, the third terminal line 306 is connected. As shown in Fig. 7, a controller (TNR) for controlling the instantaneous voltage rise and spark is provided between the second terminal line 304 and the first terminal line (or the third terminal line), and the rectifier circuit in parallel. Element D1 is connected. The line A coming from the rectifier circuit D1 is supplied with a DC 110V power supply, and a coil part (solenoid part) S is connected. The resistor R2 and the LED 308 are connected in parallel with the coil unit s. Therefore, when power is supplied to the coil unit S, the LED 308 emits light to indicate its state.

Referring to FIG. 7, since AC 220V is supplied through the voltage drop resistor WR1, AC 110V is always supplied to the rectifier circuit device D1. This alternating current is rectified by the direct current 110V in the rectifier circuit element D1. With this configuration, the user can freely select AC 110 or AC 220 so that both AC 110V and AC 220V can be used as one power supply.

Hereinafter, the operation of the switching valve 10 according to the exemplary embodiment of the present invention will be described with reference to FIGS. 1 and 2.

First, the plunger 77 is pushed forward by the plunger spring 118 in the state in which power is not applied to the solenoid 16a. Therefore, the plunger packing guide 74 is pushed and the front surface 112 of the plunger packing 72 is pressed against the end surface of the ridge 44 of the pilot seal 38 to block the exit 46 of the P-line connecting passage. Becomes At this time, the piston 62 is in the state inside the piston seal 36. This state is shown above the centerline of FIG.

The space behind the piston 62 of the piston seal 36 communicates with the pilot seal 38 through the through hole 40 (see FIG. 4), in which state the pilot seal 38 of the plunger packing guide 74. It is connected to the exhaust passage 89 through the longitudinal cutout groove 96 and the outlet 89a at the center of the raised portion 88 of the exhaust pilot 76.

At this time, when power is supplied to the solenoid 16a, the plunger 77 is pushed back by winning the force of the plunger spring 118. Then, the plunger packing 72 and the plunger packing guide 74 are pushed back by the action of the plunger packing spring 116 pushing the plunger packing 72, and eventually the rear side 114 of the plunger packing 72 becomes the exhaust pilot ( The tip surface of the raised portion 88 of 76 is blocked and the outlet 46 at the center thereof is blocked. Then, air pressure is transmitted to the pilot chamber 38 through the outlet 46 at the center of the pilot line ridge 44 of the P-line passage 24a, which is transmitted to the rear of the piston chamber 36 through the through hole 40. do. Thus, the piston 62 is pushed, and eventually the spool of the main valve is activated.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. Those skilled in the art will appreciate that modifications can be made in accordance with the spirit of the invention, and such modifications also fall within the scope of the invention.

According to the structure of this invention, since the pilot valve is integrated and it is assembled by inserting each component in turn, assembly is convenient. In addition, the operation is certain. On the other hand, it is possible to keep the button fixed simply by pressing and turning the manual operation button. On the other hand, according to the configuration of the power supply of the present invention, it can be connected to any of the AC power supply 110V and 220V, and can be directly connected to the power supply without any separate components such as sockets.

Claims (2)

A switching valve having a pilot valve provided with a plunger driven by a solenoid, wherein the pilot valve A pilot valve box having a piston seal and a pilot seal communicating with each other, having a P-line connecting passage having an outlet at an inner side of the pilot seal, and having an exhaust passage; A piston inserted into the piston seal; An exhaust pilot inserted into the pilot chamber and connected to the exhaust passage on a surface facing the outlet of the pilot chamber, through-holes formed at both sides of the outlet, and having a cylindrical groove at the front; , A sliding groove is inserted into the cylindrical groove of the exhaust pilot and is provided with a notch groove for communicating back and forth, and a hole is formed in the center, and extends through the through-hole of the exhaust pilot to protrude toward the rear of the exhaust pilot. With a plunger packing guide, A plunger packing inserted into a hole of the plunger packing guide and movably fitted between an outlet of an inner surface of the pilot chamber and an outlet of the exhaust pilot and pushed back by a spring; A plunger positioned at the rear of the exhaust pilot, the tip of which is in contact with the projection of the plunger packing guide, pushed forward by the spring and moved backward by the solenoid; Switch valve, characterized in that provided. A switching valve driven by a solenoid and provided with a power supply for supplying direct current power to the solenoid from an external alternating current power source, The power supply device includes a rectifier circuit unit for converting AC power into DC power by a stop value; A first terminal line connected to the rectifier circuit part and connected to a voltage drop resistor for a first AC voltage; A second terminal line which is a common terminal line, A switching valve connected to the first terminal line at the rear having the voltage drop resistor, and having a lower voltage than the first AC voltage, and a third terminal line for the second AC voltage.