JP2005172070A - Pilot type solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the movement of a valve body 2 is prevented by the contact of a cleaning pin with the inner peripheral surface of an orifice hole 21 because the cleaning pin is fixed to a body 11 in a pilot type solenoid valve which is closed by bringing the valve body 2 into press contact with a valve port 5 through charging water into a space 16 on the reverse side of the valve body 2 through the orifice hole 21, until now, in such a pilot type solenoid valve, the orifice hole 21 does not operate when the orifice hole 21 has been closed by water scale, etc. produced by the use for a long time, for this reason, the orifice hole 21 must be cleaned for every time of the movement of the valve body 2 by inserting the cleaning pin into the orifice hole 21 in order to clean the orifice hole 21. <P>SOLUTION: In the pilot type solenoid valve, the cleaning pin is loosely fitted in the orifice hole so as to form a required clearance between the inside peripheral surface of the orifice hole and the cleaning pin. The cleaning pin is supported by the valve body. When the valve body moves, the cleaning pin moves relative to the orifice hole. As a result, the jamming of the orifice hole is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  According to the present invention, an orifice hole is provided in a diaphragm type valve body that opens and closes a valve opening, and the valve opening is closed by the valve body by applying a primary pressure of fluid to the back of the valve body through the orifice hole. The present invention also relates to a pilot-type solenoid valve that opens the valve port by detaching the valve element from the valve port by opening the back of the valve element to the secondary side via a pilot unit equipped with an electromagnetic opening / closing mechanism.

  In this type of conventional pilot solenoid valve, for example, when water is used as a fluid, scales or the like may adhere to the orifice hole if used for many years. If the amount of deposits such as scale increases, the orifice hole may occasionally be blocked. In this type of pilot-type solenoid valve, the primary side water is sent to the back of the valve body through the orifice hole, and the pressure on the back of the valve body is increased to the primary side pressure, that is, the primary pressure. The body is pressed against the valve opening to close the valve opening.

  Therefore, if the orifice hole is blocked by scale or the like, water cannot be sent to the back part of the valve body, causing a problem that the valve body cannot block the valve opening. Therefore, a cleaning pin that is inserted into the orifice hole is attached to the main body that covers the valve body, and the cleaning pin is inserted into and removed from the orifice hole each time the valve body moves during opening and closing. What was made to do is known (for example, refer patent document 1).

On the other hand, the valve body closes the valve opening by the primary pressure of the fluid filled in the back part of the valve body, but in order to make the blockage more reliable, a valve spring is provided on the back part of the valve body. Yes. In this device, the cleaning pin is formed by bending a part of the coil spring rather than holding the cleaning pin on the main body (see, for example, Patent Document 2).
JP-A-4-107373 (FIG. 2) Japanese Patent Laid-Open No. 2001-200951 (FIGS. 3 and 5)

  Since the diaphragm type valve body is made of rubber, it is manufactured separately from the main body that houses the valve body. Then, when assembling the pilot solenoid valve, the valve body is set in the main body. If the valve body is not accurately positioned with respect to the main body during this setting, there arises a problem that the cleaning pin attached to the main body does not enter the orifice hole. Further, even if the cleaning pin enters the orifice hole, if the cleaning pin comes into contact with the inner peripheral surface of the orifice hole, there is a problem that the smooth movement of the valve element is hindered by the frictional force generated between them.

  Also, in the case where the cleaning pin is formed by bending a part of the coil spring, if the cleaning pin is not formed so as to be exactly parallel to the moving direction of the valve body, the inner circumference of the orifice hole is moved during the movement of the valve body. There arises a problem that the surface abuts against the cleaning pin and the movement of the valve body is obstructed in the middle.

  In view of the above problems, an object of the present invention is to provide a pilot-type solenoid valve that does not hinder the movement of the valve body even if a cleaning pin for cleaning the orifice hole is provided.

  In order to solve the above problems, a pilot solenoid valve according to the present invention is provided with an orifice hole in a diaphragm type valve body that opens and closes a valve opening, and a primary pressure of fluid acts on the back of the valve body through the orifice hole. The valve body is closed by the valve body, and the back part of the valve body is opened to the secondary side through a pilot part equipped with an electromagnetic opening / closing mechanism, so that the valve body is detached from the valve port and the valve port is opened. In the pilot type solenoid valve to be operated, a cleaning pin that forms a predetermined gap between the orifice hole and the inner peripheral surface of the orifice hole is loosely fitted, and the cleaning pin is held by the valve body to move the valve body. At this time, the cleaning pin moves relative to the orifice hole to prevent clogging of the orifice hole.

  In the present invention, the cleaning pin is held by the valve body instead of the main body. Therefore, even if the valve body is not accurately positioned with respect to the main body, the cleaning pin does not come into contact with the inner peripheral surface of the orifice hole to obstruct the movement of the valve body. Further, since the cleaning pin is held by the valve body, the cleaning pin moves as the valve body moves. However, the moving speed of the valve body is high, and the fluid flows through the gap provided between the cleaning pin and the orifice hole. Therefore, when the valve body moves, the cleaning pin moves in complete synchronization with the valve body. Instead, there is a slight positional shift with respect to the orifice hole. The cleaning pin scrapes off the dirt and the like adhering to the orifice hole due to this displacement, and cleans the orifice hole.

  By the way, a stopper part that prevents the cleaning pin from slipping out from the orifice hole to the retaining part side may be formed on the main body side while forming a retaining part having an enlarged diameter at one end part of the cleaning pin.

  Furthermore, a fin for rotating the cleaning pin by the flow of fluid may be formed in the retaining portion. As described above, when the cleaning pin is rotated by the fin, the removal of scales and the like by the cleaning pin is more effectively performed.

  By the way, if the retaining portion closes the orifice hole while the retaining portion is in contact with the valve body, the fluid does not flow smoothly through the orifice hole. Therefore, it is desirable that a gap be formed between the retaining portion and the valve body so that the fluid can pass through the orifice hole while the retaining portion is in contact with the valve body.

  As is apparent from the above description, the present invention has the cleaning pin held in the orifice hole of the valve body, so that it is not necessary to accurately position the valve body with respect to the main body when the valve body is assembled to the main body. The cleaning pin does not hinder the movement of the valve body.

  1 and 2, reference numeral 1 denotes a pilot solenoid valve according to the present invention. This pilot type electromagnetic valve 1 is attached in the middle of a water pipe, and includes a main body 11 in which a lower main body 11a and an upper main body 11b are combined with each other in a watertight manner. A primary passage 13 communicating with the inflow portion 12 is formed in the lower main body 11a. The primary passage 13 further communicates with an annular primary chamber 13a. The primary chamber 13 a is formed so as to surround the outflow portion 14, and a circular valve port 15 is formed between the primary chamber 13 a and the outflow portion 14. If the pressure in the primary chamber 13a, that is, the primary pressure becomes too high, the relief valve 5 is opened, water flows out from the primary chamber 13a into the relief chamber 17, and passes through the passage 18 to the outflow portion 14. Water is washed away.

  The valve port 15 is closed by a diaphragm-type valve body 2 that is movable in the vertical direction in FIG. An orifice hole 21 penetrating vertically is formed in the valve body 2. Therefore, the water in the primary chamber 13 a flows into the space 16 on the back surface side of the valve body 2 through the orifice hole 21. Although the pressure in the space 16 is the same as the pressure in the primary chamber 13a, the pressure in the space 16 acts on the entire back surface of the valve body 2, whereas the area of the primary chamber 13a with respect to the valve body 2 flows out. Since the portion 14 is narrowed by the amount formed, the force for pushing the valve body 2 from the back side becomes larger. Therefore, the valve body 2 is pressed against the valve port 15, and the valve body 2 closes the valve port 15.

  In the present invention, the cleaning pin 3 is inserted into the orifice hole 21. The cleaning pin 3 is an injection molded product of resin, and is set to a thickness that can form a predetermined gap with the inner peripheral surface of the orifice hole 21. In order to prevent the cleaning pin 3 from dropping downward in FIG. 1, a retaining portion 31 having a diameter larger than the diameter of the orifice hole 21 is formed at the upper end of the cleaning pin 3. Since the cleaning pin 3 is only inserted into the orifice hole 21, it is held by the valve body 2 instead of the main body 11. The length of the cleaning pin 3 is longer than the height of the space 16, and the retaining portion 31 comes into contact with the lower surface 16 a of the upper main body 11 b that is the upper wall surface of the space 16, so that the cleaning pin 3 comes out upward from the orifice hole 21. There is no. The lower surface 16a corresponds to a “stopper portion” in the claims.

  An electromagnetic valve mechanism 4 is provided in the upper main body 11 b located above the space 16 on the back side of the valve body 2. The space 16 communicates with the valve chamber 42 through a passage 41 formed in the upper main body 11b. When the solenoid coil 43 of the electromagnetic valve mechanism 4 is energized, the valve 44 formed at the lower end of the plunger is raised, and the valve chamber 42 is communicated with the passages 45a and 45b. The passages 45a and 45b communicate with the passage 45c, and the passage 45c further communicates with the outflow main pipe 14a through the passage 45d in the same manner as the outflow portion 14.

  Therefore, when the solenoid coil 43 is energized and the valve 44 is raised as described above, the space 16 on the back side of the valve element 2 sequentially passes through the outflow path including the passage 41, the passage 45a, the passage 45b, the passage 45c, and the passage 45d. It will be connected to the outflow main pipe 14a. When the orifice hole 21 is narrower than these outflow paths, the amount of water flowing out from the space 16 to the outflow portion 14 is larger than the amount of water flowing into the space 16 through the orifice hole 21, and the pressure in the space 16 is almost atmospheric pressure. Suddenly decreases. Then, the force for pushing up the valve body 2 from the primary chamber 13a side becomes larger than the force for pushing the valve body 2 from the space 16 side, and the valve body 2 moves upward and the valve port 15 is opened. Then, water flows directly from the primary chamber 13a through the valve port 15 to the outflow portion 14, and the pilot solenoid valve 1 is opened. After the valve is opened, the valve body 2 is stabilized and a constant amount of water flows when the water pressures in the primary chamber 13a and the space 16 are substantially balanced.

  Next, when the solenoid coil 43 is energized in the reverse direction, the plunger descends and the valve 44 again shuts off the valve chamber 42 from the passages 45a and 45b. Then, the pressure from the outflow path is not applied to the outflow portion 14, and the pressure of the outflow portion 14 decreases. Further, water flows into the space 16 through the orifice hole 21, and the pressure in the space 16 becomes substantially equal to the pressure in the primary chamber 13a and becomes higher than the pressure in the outflow portion 14, so that the valve body 2 is pushed downward again. As a result, the valve port 15 is closed. In addition, 5 is a relief valve which releases the pressure to the outflow part 14 side, when the pressure of the primary chamber 13a becomes too high.

  Thus, the valve body 2 can be moved up and down by controlling the energization to the solenoid coil 43. Although the cleaning pin 3 is held by the valve body 2, the cleaning pin 3 is merely loosely fitted so as to form a predetermined gap with the orifice hole 21, and thus moves in the same manner as the valve body 2. Do not mean. Therefore, when the valve body 2 moves up and down, the cleaning pin 3 moves relative to the orifice hole 21 in the up and down direction. As described above, when the cleaning pin 3 moves in the vertical direction in the orifice hole 21, for example, even if dirt or the like adheres to the orifice hole 21, the cleaning pin 3 is scraped out of the orifice hole 21. It is possible to prevent scales and the like from accumulating in the orifice hole 21 until the 21 is closed.

  By the way, it is not desirable that the retaining portion 31 formed at the upper end of the cleaning pin 3 closes the orifice hole 21. Therefore, as shown in FIG. 4, a notch 23 is provided in the seat portion 22 on which the retaining portion 31 is seated, and water flows through the notch 23 even when the retaining portion 31 is in contact with the seat portion 22. I did it. The notch 23 may be formed not on the seat portion 22 but on the retaining portion 31 side, and on the contrary, a protrusion may be provided instead of the notch.

  The retaining portion is not limited to a specific shape, and may be a hemispherical retaining portion 31a as shown in FIG. 5, for example. Further, it may be formed into a spherical retaining portion 31b, or may be a hemispherical retaining portion 31c obtained by turning the previous hemispherical retaining portion 31a upside down. The cleaning pin 3 is not limited to a resin injection-molded product, and a thin wire may be used as the cleaning pin. In this case, the retaining portion 31d is formed by bending.

  Further, the fin-shaped retaining portion 6 may be formed. In particular, when the fin-shaped retaining portion 6 is used, the retaining portion 6 may be set so as to be positioned in the space 16 on the back side of the valve body 2 as in the above-described embodiment. Alternatively, it may be set upside down so that the retaining portion 6 is positioned in the primary chamber 13a.

  In that case, the stopper portion is configured by setting the position of the cleaning pin 3 so as not to coincide with the primary passage 13 penetrating vertically, and bringing the retaining portion 6 into contact with the bottom surface 13b of the primary chamber 13a. However, the cleaning pin 3 may be prevented from coming out downward. Further, as shown in FIG. 6, a protruding portion 13 c is provided in the opening portion of the primary passage 13, and a stopper portion is configured by bringing the retaining portion 6 into contact with the protruding portion 13 c, and below the cleaning pin 3. You may make it prevent omission.

  When the fin-shaped retaining portion 6 is set so as to be positioned in the primary chamber 13a in this way, when the valve body 2 moves upward and the valve port 15 is opened, from the primary chamber 13a. A fast water flow to the outflow part 14 occurs. Since the retaining portion 6 is located in the water flow, the cleaning pin 3 rotates violently when and when the valve is opened. When the cleaning pin 3 is forcibly rotated in this way, the water in the orifice hole 21 is strongly discharged, and the orifice hole 21 is more reliably prevented from being clogged. Incidentally, a coil spring may be provided in the space 16 in order to securely close the valve body 2.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention II-II cross section III-III cross section Partial enlarged view showing the upper structure of the orifice hole The figure which shows the other form of a cleaning pin The figure which shows the use condition of the cleaning pin provided with the fin

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pilot type solenoid valve 2 Valve body 3 Cleaning pin 4 Electromagnetic valve mechanism 11 Main body 12 Inflow part 14 Outflow part 15 Valve port 21 Orifice hole 22 Seat part 23 Notch

Claims (4)

  An orifice hole is provided in a diaphragm type valve body for opening and closing the valve opening, and the valve opening is closed by the valve body by applying a primary pressure of fluid to the back of the valve body through the orifice hole, and an electromagnetic opening and closing mechanism In a pilot-type solenoid valve in which the valve body is detached from the valve port and the valve port is opened by opening the back of the valve body to the secondary side via a pilot unit equipped with the above-mentioned orifice hole. A cleaning pin that forms a predetermined gap with the peripheral surface is loosely fitted to hold the cleaning pin on the valve body, and the cleaning pin moves relative to the orifice hole when the valve body moves. Pilot type solenoid valve that prevents clogging of orifice holes.   2. A stopper part for preventing the cleaning pin from slipping out from the orifice hole to the retaining part side is formed on the main body side while a retaining part having an enlarged diameter is formed at one end of the cleaning pin. The pilot solenoid valve according to 1.   The pilot solenoid valve according to claim 1 or 2, wherein a fin for rotating a cleaning pin by a flow of fluid is formed in the retaining portion. 3. A gap is formed between the retaining portion and the valve body so that fluid can pass through the orifice hole while the retaining portion is in contact with the valve body. Item 4. The pilot type solenoid valve according to Item 3.

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