KR101082761B1 - Differential pressure type solenoid valve - Google Patents

Abstract

Disclosed is a differential pressure solenoid valve suitable for an environment such as a fountain and fast response characteristics. The differential pressure solenoid valve is composed of a main valve body 110 and a valve cover 120 to form a pressure chamber 123, a main flow path and a pilot flow path, and are installed in the pressure chamber to operate to open and close the main flow path. A main valve assembly 300 including a main valve member 310, a pilot valve member 130 for converting a pilot flow path, and a solenoid mechanism 200 to which a plunger 220 is attached and operated by attaching the pilot valve member is provided. The main valve assembly 300 operates to open and close the main flow path to the main valve member by moving by pressure differences acting on both sides of the main flow path and the pilot flow path in the pressure chamber, and is configured to guide the main flow path to maintain the correct posture. The pilot flow passage is formed to introduce the pilot fluid directly from the inlet side of the main flow passage, so that the pilot flow passage can have a larger diameter than the orifice formed in the existing main valve. Therefore, the blockage of the orifice is significantly reduced, and the response characteristics of the valve are greatly improved.

Description

DIFFERENTIAL PRESSURE TYPE SOLENOID VALVE

The present invention relates to a differential pressure solenoid valve, and more particularly, to a differential pressure solenoid valve capable of controlling a large flow rate such as a fountain at a high speed and allowing a test operation or the like by simple manual operation.

The fountain is a so-called solenoid valve that uses a solenoid which can be controlled automatically according to a program or an equalizing signal of a performance song. Solenoid valves are divided into direct acting type and pilot operated type. Direct acting type is solenoid to directly open and close the valve, the structure is simple and less trouble, but it is not suitable for large flow control because the solenoid output is large and the power consumption is large according to the flow rate. The pilot operated type uses a pilot valve that controls a small flow rate as an auxiliary valve to control the pilot valve with a solenoid and operate the main valve by the pressure of the fluid by the pilot valve. This is possible.

On the other hand, the fountain has a large flow rate and requires a quick response characteristic of the valve, it is well known to use the differential pressure as a form to meet this demand. The solenoid valve using the differential pressure is a pilot valve of the above-described pilot operation type, and a pressure chamber for trapping and regulating the fluid is provided separately from the main flow passage for the main valve. To open and close the main euro. That is, since the pilot valve is operated with a small solenoid output, the response characteristic is fast, and the large flow rate can be easily controlled by opening and closing the main valve in response to the pressure change of the fluid (water) converted by the pilot valve.

Looking at the prior art associated with such a differential pressure solenoid valve as follows.

Patent Document 1 (KR10-0903672 B1) cited below proposes a so-called diaphragm type structure having a disk-shaped main valve and a diaphragm supporting the same.

Patent Document 2 (KR10-2009-0111572 A) cited below proposes a so-called piston type structure having a piston type main valve and a support shaft stably supporting the main valve.

On the other hand, as to enable the solenoid valve to be operated manually, Patent Document 3 (KR10-2009-0118591 A) cited below has a structure that can open the pilot valve manually, Patent Document 4 (KR20 cited below) -0225125 Y1) proposes a structure for opening and closing directly between the inlet and the outlet of the main valve body.

KR 10-0903672 B1 KR 10-2009-0111572 A KR 10-2009-0118591 A KR 20-0225125 Y1

In the differential pressure solenoid valve, in the past, in order to introduce pilot fluid into the pressure chamber of the main valve, a small orifice having a small diameter communicating with the inlet side of the main flow path was formed in the main valve. However, since the orifice of the orifice is very small, quick operation of the pilot valve is possible. Nevertheless, the operation of the main valve is not made quickly, and the response characteristics thereof are not improved, and the orifice of the fine diameter is frequently blocked, and thus there is a problem that frequently occurs.

In addition, the piston valve structure of the main valve is more stable than the diaphragm type structure, but is generally disc-shaped, so it is often malfunctioned due to an unbalanced opening and closing movement such as inclination without achieving horizontal balance.

On the other hand, the above-described conventional structure for the manual operation of the solenoid valve is only a manual operation without driving the solenoid, it is possible to check the blockage of the pilot flow channel including the orifice, unbalanced opening and closing movement of the main valve, etc. Since it is not a structure, it is impossible to test the installation after installation or check for failure during use.

An object of the present invention is to provide a differential pressure solenoid valve having an improved flow path structure that can improve the response characteristics of the valve and minimize the cause of malfunction and failure.

Another object of the present invention is to provide a differential pressure solenoid valve that can more easily support the piston-type main valve to more easily check the failure after installation or use while reducing the cause of malfunction and failure.

The differential pressure solenoid valve according to the present invention, which achieves the above object, has a pressure chamber formed between an inlet passage and an outlet passage of the fluid and both passages thereof to trap the fluid to generate pressure, and both passages are A valve body forming a main flow path connected through a part of the pressure chamber and a pilot flow path for introducing and discharging a pilot fluid to the remaining space of the pressure chamber; A main valve assembly operable to open and close between both passages by a difference in pressure and a pressure of the pilot fluid, a pilot valve member for converting the pilot flow path, and a solenoid mechanism for operating the pilot valve member by operating with an external electric signal To intercept the flow of fluid through the main flow path, the pressure chamber is a cylindrical space A cylindrical guide groove concave up at a central portion of the upper side of the cylindrical space, the main valve seat being raised to the central portion of the bottom surface in the space of the pressure chamber and opened toward the outlet side passage as a part forming the main flow path; There is a space portion communicating with the inlet side passage around the main valve seat, the main valve assembly being housed in the pressure chamber with the main valve member and the main valve member attached to the main valve sheet to close and close the main valve sheet. And a valve support having a cylindrical portion which is movable by the pressure difference between the two sides and protrudes from the center thereof and is inserted into the cylindrical guide groove to guide the movement in the correct posture, and as the part forming the pilot flow path. With a smaller aperture in the inlet passage of the valve body Through the pilot inlet and the center of the main valve assembly formed with a pilot inlet penetrating directly into the hydraulic chamber and a pilot valve seat in the middle of the pilot inlet through the center of the cylindrical guide groove of the pressure chamber and opened and closed by the pilot valve member And a pilot outlet connecting hole for communicating the pilot outlet to the opening of the main valve seat at all times.

Preferably, the valve body is composed of a combination of the main valve body and the valve cover, the main valve body is opened up as a part of the inlet passageway and the outlet passageway of the main flow passage, the pressure chamber and the main valve seat and the surroundings thereof. And a connection portion for exposing the pressure chamber to the pressure chamber, and a pilot inlet connection hole which is a part of the pilot inlet port, and the pilot valve cover is coupled to the main valve body to form the pressure chamber between the connection portion. A seal forming portion, the pilot inlet and the outlet, and a solenoid connection portion that opens upwardly through the pilot inlet toward the pilot outlet, and the solenoid mechanism is excited by the external electrical signal to generate an electronic thrust. The wave pulled by the body and its electronic thrust When returning the plunger and the plunger for supporting the pilot valve member attached to the resilient spring is coupled to the plunger, it is the solenoid body may be in a form that can be locked with the connection of the solenoid pilot valve cover.

The differential pressure solenoid valve according to the present invention is also a rod body which is coupled to the pilot outlet connection hole of the main valve assembly and extends downward, and has a lower end portion protruding to the outside through the outlet side passage wall surface of the valve body, and at the upper end thereof. And a check rod having a flow groove through which the fluid flows, and a flow hole passing through the flow groove and communicating with the outlet passage thereof, to press the lower end of the check rod to forcibly open the main valve assembly. In this case, more preferably, the check operation rod may be configured to connect a separate mechanism to the lower end protruding to the outside.

According to the present invention, one side of the main valve is operated by the pressure introduced by the fluid flowing into the inlet side passage of the main flow passage which is always filled around the main valve seat while the other side is introduced from the pilot flow path and the pilot fluid filled in the pressure chamber Pressure acts and moves in the opening and closing direction with respect to the main valve seat by the differential pressure on both sides. At this time, the valve support of the main valve assembly for supporting the main valve has a support, the support is guided in the opening and closing direction of the cylindrical support groove formed in the pressure chamber. Therefore, the main valve is not inclined to maintain the correct posture, the opening and closing movement is smooth and the problem that causes the malfunction due to the posture imbalance is solved. In addition, the added check operation rod also serves to guide the opening and closing movement of the valve support is to provide an effect to achieve a more stable opening and closing movement of the main valve.

In addition, in the present invention, since the pilot inlet port introduces the pilot fluid directly from the inlet side passage of the main flow path as a part for forming the pilot flow path to the pressure chamber, it is possible to make the diameter larger than that of the orifice penetrating the conventional main valve. In this way, when the diameter of the pilot channel is increased, the problem of clogging by foreign substances can be minimized, and the cause of failure can be greatly reduced, and the opening and closing operation of the main valve by the pilot channel conversion operation to the pressure chamber is also accelerated. The effect that can significantly improve the response characteristics is provided.

On the other hand, the check operation rod to open the main valve by pressing by hand without driving the solenoid, in place of the pilot valve member that is automatically operated by the solenoid mechanism, it is possible to manual operation such as controlling the solenoid mechanism. Therefore, beyond the concept of manual opening of the valve, the valve can be tested after fabrication, assembly, or installation to check for defects and to check for failure during use. Unlike the conventional manual operation, the inspection rod can be extended by connecting long strings structurally or by connecting a separate linkage mechanism. Therefore, the inspection rod can be installed in water such as a fountain. Even if the valve position is not easily accessible, the check operation is possible.

The accompanying drawings are preferred embodiments of the differential pressure solenoid valve according to the present invention, which are merely to help understanding of the practice of the present invention, may be exaggerated or omitted for each part, and may be different from the actual ones.
1 is a perspective view showing the appearance of a differential pressure solenoid valve according to a preferred embodiment of the present invention,
2 is an exploded perspective view of components of a differential pressure solenoid valve according to a preferred embodiment of the present invention;
3 is a cross-sectional view illustrating a structure of a main valve assembly of a differential pressure solenoid valve according to a preferred embodiment of the present invention;
Figure 4 is a cross-sectional view showing a stop state of the differential pressure solenoid valve according to a preferred embodiment of the present invention,
5 is a cross-sectional view showing an operating state by a solenoid of a differential pressure solenoid valve according to a preferred embodiment of the present invention;
6 is a cross-sectional view showing a manual operation state for the inspection of the differential pressure solenoid valve according to a preferred embodiment of the present invention.

The differential pressure solenoid valve according to the present invention illustrated in Figure 1 is composed of a valve body 100 and a solenoid mechanism 200. The valve body 100 includes a main valve body 110 and a pilot valve cover 120 and includes a main valve assembly 300 shown in FIG. 2.

2 to 4, the main valve body 110 may include a main valve sheet opened to communicate with the inlet passage 111, the outlet passage 112, and the outlet passage 112 of the main flow path for flowing fluid ( 113, the space 115 extended around the main valve seat 113, and the connecting opening 116. The connection opening 116 is open upward. The main valve seat 113 is formed at the end of the barrier 114, and the barrier 114 is connected to the outlet side passage 112 and is distinct from the inlet side passage 111. The space 115 around the main valve seat 113 is connected to the inlet passage 111. That is, a main flow path is formed through which the fluid (water) introduced into the inlet passage 111 flows to the outlet passage 112 through the space 115 and the main valve seat 113. The main valve body 110 also has a small diameter pilot connection hole 117 on one side of the inlet passage 111, which is formed as part of the pilot flow path of the valve cover 120 to be described later.

The valve cover 120 has a main valve connecting portion 121 and a solenoid connecting portion 122 corresponding to the connecting opening portion 116 of the main valve body 110, and the main valve body 110 is formed by a space inside the main valve connecting portion 121. The pressure chamber 123 is formed in between. The pressure chamber 123 has a cylindrical shape, and a concave guide groove 124 is formed coaxially in a central portion thereof. The valve cover 120 also has a pilot flow path pilot inlet 125 and a pilot outlet 126 for the pressure chamber 123. The pilot inlet 125 connects the pilot connection hole 117 of the main valve body 110 and the pressure chamber 123 to always introduce pilot fluid from the inlet passage 111 of the main valve body 110. The pilot outlet 126 communicates the pilot inlet 125 with the guide groove 124 described above. At the edge of the pilot outlet 126 opened at the pilot inlet 125, a pilot valve sheet 127 is formed to be opened and closed by the pilot valve member 130. The solenoid connection portion 122 is open coaxially with the pilot valve seat 127 and has a female threaded portion 128 for threaded engagement with the solenoid mechanism described later.

The solenoid mechanism 200 includes a solenoid body 210, a plunger 220, and a plunger spring 230, and is fixedly installed to the valve cover 120 through the connector 218 coupled to the solenoid body 210. do. Referring to FIG. 4, the solenoid body 210 includes coils 212, coil bobbins 213, yokes 214a and 214b, frames 215, cores 216, which are typical components of the exterior case 211. The bushing 217 may be mounted, and the inside of the outer case 211 may be molded into a resin encapsulation member (not shown) to form a structure that can be installed underwater. Here, the bushing 217 is a non-magnetic round bar, and both ends thereof are fixedly coupled to the core 216 and the connector 218, and are integrated by fastening the upper end of the core 216 with a nut 409.

The plunger 220 is a magnetic material, is inserted into the bushing 217 together with the plunger spring 230, and supports the pilot valve member 130 attached to the lower end. The plunger 220 is pulled up by the electronic thrust generated when the coil 212 is excited, and is returned by the plunger spring 230 when the exciting current of the coil 212 is interrupted. The plunger 220 has a spring groove 221 for accommodating the plunger spring 230, and has a cutout 222 on its outer circumferential surface. The cutout 222 connects the spring groove 221 and the pilot flow path of the valve cover 120 described above. That is, in order to smoothly move the plunger 220 in order to prevent the spring groove 221 from acting as a damper in a vacuum state.

The main valve assembly 300 includes a main valve member 310, a main valve support 320, and a check operation rod 330, and includes a separate main valve spring 340. 3 and 4, the main valve member 310 is to close the main flow path in close contact with the main valve seat 113, the ring shape and the material is rubber or Teflon. The main valve support 320 is composed of an integral disc portion 321 and a cylindrical portion 322, and has a pilot outlet connection hole 323 penetrating through the center thereof. The disc 321 is lifted while maintaining the airtightness with the wall surface of the pressure chamber 123 in the main valve connecting portion 121 formed in the pilot valve cover 120 described above, the cylindrical portion 322 is the pressure chamber 123. Guided to the guide groove 124 formed in the) to maintain the correct posture during the ascent. The pilot outlet connector 323 is formed as part of the pilot flow path described above and has a female threaded portion 324. The main valve member 310 is attached to the bottom surface of the main valve support 320 by the fixed ring 325, and the fixed ring 325 is restrained and coupled by the check operation rod 330. The inspection operation rod 330 is a rod-shaped rod having a male thread portion 331 which is fastened to the female thread portion 324 of the main valve support 320 at an upper end thereof, and a pilot flow groove 332 and an intermediate portion which are dug deeply from the upper end to the lower end portion thereof. Has a plurality of distribution holes 333 penetrating to the outside. The pilot flow groove 332, the distribution hole 333, and the pilot outlet connecting hole 323 are for communicating the aforementioned pilot outlet 126 with the outlet side passage 112 of the main valve body 110. Screw groove 334 is formed at the lower end of the check operation rod 330, which can be connected to the strap or link operation mechanism, for example not shown. Long stretches of the strap will make it easier to locate the valve, and the linkage mechanism will allow remote manual operation. That is, it is advantageous in an environment such as a fountain where the valve position cannot be easily found or easily accessed. The check operation rod 330 may be integrated with the main valve support 320 together with the fixed ring 325, but preferably, a material different from the material (eg brass) of the main valve support 320 (eg, stainless steel). ), Economics such as material costs and processing costs are achieved. The main valve spring 340 is provided to elastically support the main valve assembly 300 to push the main valve member 310 in the direction of closing the main valve seat 113. The main valve spring 340 is only necessary to assist the pressure of the pilot fluid acting in the same direction to the main valve assembly 300, it is not necessary.

Unexplained reference numerals 401 to 407 in the drawings are for packing or sealing the parts so that fluid does not leak from the valve parts.

On the other hand, although not illustrated in the drawings, the main valve body 110 and the valve cover 120 of the valve body 100 is made of separate components to easily form the main flow path and the pilot flow path as described above, respectively, Technically, if it is possible to form the main flow path and the pilot flow path, the main valve body 110 and the valve cover 120 may be provided as one body.

Hereinafter, the operation of the differential pressure solenoid valve as described above will be described with reference to FIGS. 4 to 6. The initial state in which the valve is closed is shown in FIG. 4, and the operating state in which the valve is open is shown in FIG. 5. 6 shows a manual operation state for inspection.

In the initial state of FIG. 4, the plunger 220 presses the pilot valve member 130 by the plunger spring 230, and the pilot valve member 130 blocks the pilot valve seat 127. That is, the pilot outlet 126 is closed and the pilot fluid introduced through the pilot inlet 125 from the inlet side passage 111 of the main flow path is filled in the pressure chamber 123. Therefore, the pressure chamber 123 is maintained at the same pressure as the inlet passage 111 of the main flow passage, and the pressure acts on the upper surface of the disc portion 321 of the main valve support 320 to lower the entire main valve assembly 300. That is, the main valve member 310 is pressed in the direction in which the main valve seat 113 is in close contact. In addition, the space 115 expanded around the main valve seat 113 also becomes the same pressure as the inlet passage 111. That is, the same fluid pressure acts on both the upper and lower surfaces of the disc portion 321 of the main valve support 320 of the main valve assembly 300. However, since the area acting on the upper surface of the disc portion 321 is larger than the lower surface, the entire main valve assembly 300 is pressed downward, and the main valve member 310 is pressed by the main valve seat 113 so that the inlet side passage of the main flow path ( 111 and the outlet passage 112 are blocked so that no fluid flows.

In the initial state of FIG. 4, when a predetermined current is applied to the wire 219, the coil 212 is excited to generate electronic thrust, which causes the plunger 220 to be pulled upward. Then, as shown in FIG. 5, the pilot valve member 130 is raised together with the plunger 220 to open the pilot outlet 126. The pressure chamber 123 is then opened to the outlet side passage 112 of the main valve body 110 through the pilot outlet 126, the pilot outlet connection hole 322, the distribution groove 332, and the distribution hole 333. Its internal pressure drops, so that the entire main valve assembly 300 rises up, the main valve member 310 also rises, and eventually the inlet passage 111 and the outlet passage 112 of the main flow path are connected to allow fluid to flow. do. When the excitation current of the coil 212 is interrupted in the state as shown in FIG. 5, the plunger 220 is returned to close the pilot valve member 130, and thus, the pilot valve member 130 is returned to the initial state of FIG. 4 as described above.

Next, without driving the solenoid in the initial state of FIG. 4, that is, when the pilot valve member 130 is closed, pressing the lower end of the check operation rod 330 protruding below the main valve body 110, FIG. Likewise, the entire main valve assembly 300 is lifted up together with the check operation rod 330 to open the main valve member 310, so that the inlet passage 111 and the outlet passage 112 of the main flow passage are connected to each other so that the fluid flows. Will flow. When the pressed check operation rod 330 is released, the main valve assembly 300 is returned to the initial state by the hydraulic and auxiliary main valve springs 340 acting on the pressure chamber 123. By the manual operation of pressing the check operation rod 330 as described above, it is possible to determine whether the valve is operating normally and whether there is a failure, and to check and eliminate the temporary failure such as the main valve assembly 300 being constrained by foreign matter. It is. For reference, the lower end portion of the check operation rod 330 penetrates through the outlet side passage 112 of the main valve body 110 and protrudes to the outside. For example, in a submerged environment such as a fountain, this may not be a problem.

100; valve body, 110: main valve body, 120: valve cover, 111: inlet passage, 112: outlet passage, 123: pressure chamber, 124: guide groove, 125: pilot inlet, 126: pilot outlet, 127: pilot Valve seat, 130: pilot valve member, 200: solenoid mechanism, 220: plunger, 300: main valve assembly, 310: main valve member, 320: main valve support, 330: check rod

Claims (4)

A pressure chamber 123 is formed between the inlet passage 111 and the outlet passage 112 and both passages of the fluid to trap the fluid to generate pressure, and both passages form part of the pressure chamber. A valve body 100 for forming a pilot flow path for introducing and releasing pilot fluid to the main flow path and the remaining space of the pressure chamber connected through the valve main body 100, the pressure and the pilot of the fluid received in the pressure chamber flowing through the main flow path The main valve assembly 300, which operates to open and close between the two passages by the difference in the pressure of the fluid, the pilot valve member 130 for converting the pilot flow path, and the pilot valve member 130 operated by an external electric signal. It is provided with a solenoid mechanism 200 for manipulating the flow of the fluid via the main flow path,
The pressure chamber 123 is a cylindrical space, there is a cylindrical guide groove 124 concave up in the center of the upper side in the cylindrical space,
The main valve seat 113 which is raised to the bottom center in the space of the pressure chamber and opened toward the outlet side passage 112 as the part forming the main flow path and the inlet side passage around the main valve sheet 113. There is a space 115 in communication with 111,
The main chamber assembly 300 is accommodated in the pressure chamber 123 with the main valve member 310 and the main valve member 310 attached to each other to close and close the main valve seat 113, and the pressure chamber 123. ) And a valve support having a cylindrical portion 322 which is movable by a pressure difference between both sides of the space 115 and is protruded upward from the center thereof and inserted into the cylindrical guide groove 124 to guide the movement in a correct posture. 320 is provided, and
In the middle of the pilot inlet 125 and the pilot inlet 125 which penetrates directly into the pressure chamber 123 with a smaller diameter in the inlet passage 111 of the valve body 100 as a portion forming the pilot flow path. The pilot outlet 126 and the main valve assembly 300 having a pilot valve seat 127 penetrating the center of the cylindrical guide groove 124 of the pressure chamber 123 and opened and closed by the pilot valve member 130. A differential pressure solenoid valve, characterized in that there is a pilot outlet connection hole 323 through which the pilot outlet port 126 communicates with the opening of the main valve seat 113 at all times. The method according to claim 1, wherein the valve body 100 is made of a combination of the main valve body 110 and the valve cover 120, wherein the main valve body 110 is the inlet side passage 111 and the outlet side of the main flow path Passage 112, a connection 116 which opens upward as part of the pressure chamber 123 and exposes the main valve seat 113 and its surroundings to the pressure chamber 123, and a portion of the pilot inlet 125. And a pilot chamber inlet connecting hole 117, and the valve cover 120 is coupled to the main valve body 110 to form a pressure chamber for forming the pressure chamber 123 between the connecting portion 116. Part 121, the pilot inlet 125 and the pilot outlet 126, and the solenoid connecting portion 128 opened upward through the pilot inlet 125 toward the pilot outlet 126; ,
The plunger 220 and the plunger are attached to and support the solenoid body 210 which is excited by the external electric signal to generate electronic thrust and the pilot valve member 130 pulled by the electronic thrust. The differential pressure type solenoid is coupled to the plunger spring 230 to elastically return 220, the solenoid body 210 is formed to be coupled to the connection portion 116 of the valve cover 120. valve. The method of claim 1, wherein the rod is coupled to the pilot outlet connection hole 323 of the main valve assembly 300 and extends directly downward, the lower end of which passes through the wall of the outlet passage 112 of the valve body 100 to the outside. And a check operation rod 330 having a distribution groove 332 which protrudes and flows fluid from the upper end to the inside, and a distribution hole 333 passing through the distribution groove 332 and communicating with the outlet side passage 112. By pressing the lower end of the check operation rod 330, the differential pressure solenoid valve, characterized in that the main valve assembly 300 can be forcibly opened. 4. The differential pressure solenoid valve according to claim 3, wherein the check operation rod (330) can connect a separate mechanism to a lower end portion protruding to the outside.

Images