JP4565450B2 - solenoid valve - Google Patents

Description

  The present invention includes an electromagnetic coil that is energized from the outside, a plunger that is reciprocated by electromagnetic force generated by the electromagnetic coil, and a valve body that is provided in the middle of a gas passage with a valve body provided at the tip of the plunger. The present invention relates to a solenoid valve that opens and closes.

  A conventional solenoid valve of this type has a piping block having an inflow portion into which gas flows and an outflow portion from which gas flows out, and is a space opened to the outside between the inflow portion and the outflow portion. Is formed. This piping block is formed by casting, and then a necessary portion is cut and molded.

  If the gas passage is closed by bringing the valve element into contact with the cut surface of the piping block, gas leakage occurs when a burrow is formed on the cut surface. Therefore, a cylindrical sheet body provided with a valve port is formed by press working, and the sheet body is inserted into the space of the piping block (for example, see Patent Document 1).

  In this device, a cylindrical guide pipe is provided at the center of the electromagnetic coil, and the frame serving as the magnetic path of the electromagnetic coil and the sheet body are connected in a state where the plunger is placed in the guide pipe.

In this configuration, since the guide pipe that determines the position of the plunger and the seat body that has the valve opening that closes the valve body that is formed at the tip of the plunger cannot be directly positioned, the lower end of the guide pipe is placed in the entire circumferential direction. The sheet body and the guide pipe are directly positioned (see, for example, Patent Document 2).
Japanese Patent No. 3322947 Publication (FIG. 1) Japanese Patent Laying-Open No. 2004-197880 (FIG. 1)

  In the conventional solenoid valve, the guide pipe for positioning the valve body via the plunger and the sheet body on which the valve seat on which the valve body is seated are formed as separate members. If the positioning of the valve body is not performed accurately, there arises a problem that the positions of the valve body and the valve port are shifted.

  In the configurations described in both publications, before inserting the seat body into the piping block, the seat body is attached to the guide pipe, and it is checked whether there is a problem such as leakage with the valve body seated in advance. The effect is described. If a defect is found in the sheet body during this check, the sheet body needs to be replaced.

  However, in both publications, the part to which the sheet body is attached is the pressing plate 15 in Patent Document 1 and the protruding piece 432 in Patent Document 2, both of which are metal members. Therefore, in order to detachably configure the sheet body, it is required that the processing accuracy of the sheet body and the mating member is high. In other words, if the fit is loose, the seat body will be released by the biasing force of the spring that biases the valve body in the valve closing direction. Conversely, if it is tight, the seat body once attached can be easily removed. Disappear.

  Furthermore, in the above-mentioned conventional one, if the phase of the inlet for flowing gas into the sheet body does not match the predetermined phase, the gas cannot be flown into the sheet body well, so the sheet body is mounted. When doing so, there is an inconvenience that the inlet must be positioned.

  In view of the above problems, an object of the present invention is to provide an electromagnetic valve capable of solving the above-described problems.

In order to solve the above problems, an electromagnetic valve according to the present invention includes an electromagnetic coil that is energized from the outside, a plunger that reciprocates by electromagnetic force generated by the electromagnetic coil, and a valve port that is provided in the middle of a gas passage. A solenoid valve that opens and closes with a valve body provided at the tip of the plunger, and includes a spring that presses the valve body against the valve opening via the plunger , and a guide pipe that surrounds the plunger and guides the reciprocating movement of the plunger. The guide pipe is extended, a valve port is formed at one end of the guide pipe, and a space that is located in the middle of the pipe and opens to the outside is formed in the pipe block in which the gas passage is formed. one end of the pipe and adapted to be inserted into this space, the piping block in a state before fixing the electromagnetic coil, the state of being contained in the guide pipe plunger Against the biasing force of the spring acting in a direction to pull out the guide pipe through, as a holding means for rotatably to hold detachably attached to a normal position relative to the guide pipe electrodeposition magnetic coils, the inner peripheral surface of the guide pipe A seal member is provided to prevent gas in the guide pipe from leaking out from the other end of the guide pipe, and resists the biasing force of the spring by the frictional force between the seal member and the inner peripheral surface of the guide pipe. The guide pipe is held in a normal position.

  In the above configuration, since the guide pipe for determining the position of the plunger and the valve port on which the valve body provided at the tip of the plunger is seated are integrally formed, the positions of the valve body and the valve port do not shift.

  In addition, a space that is located in the middle of the piping and opens to the outside is formed in the piping block in which the gas passage is formed, and one end of the guide pipe is inserted into the space, and an electromagnetic coil is provided in the piping block. If a holding means is provided to hold the guide pipe detachably in a proper position with respect to the electromagnetic coil while holding the plunger in the state before fixing, the valve is closed before the guide pipe is inserted into the piping block. If there is a problem, the guide pipe can be removed and repaired.

  The holding means is a seal member that comes into contact with the inner peripheral surface of the guide pipe and prevents gas in the guide pipe from leaking from the other end of the guide pipe, and between the seal member and the inner peripheral surface of the guide pipe. If the guide pipe is configured to be held at a regular position by the frictional force, the guide pipe can be easily attached and detached.

  The space formed in the piping block is provided with an inflow conduit that opens laterally with respect to this space, and the guide pipe is inserted into this space, regardless of the mounting phase of the guide pipe. If the guide pipe is opened with multiple inlets that allow the gas from the inflow pipe to flow into the guide pipe, there is no need to worry about the mounting phase of the guide pipe when installing the guide pipe. Can be reduced.

  As is apparent from the above description, in the present invention, the guide pipe for determining the position of the plunger and the valve port on which the valve body provided at the tip of the plunger is seated are integrally formed. It is not necessary to form two or more members, and the operation of connecting these members is also unnecessary. Further, by forming the valve port in the guide pipe, the positions of the valve body and the valve port do not shift.

  Referring to FIG. 1, reference numeral 1 denotes an electromagnetic valve according to the present invention, which includes a drive unit 2 that drives a plunger 5 made of a magnetic material, and a piping block 3 that forms a gas passage.

  An electromagnetic coil 22 that excites a core 21 that is a fixed magnetic pole is attached to the drive unit 2. In addition, a magnetic path member 23 is provided as a path of magnetic flux generated by the electromagnetic coil 22, and a magnetic path is formed between the core 21 and the plunger 5 through the magnetic path member 23 when the electromagnetic coil 22 is energized. Then, the plunger 5 is adsorbed to the core 21.

  A spring 24 that biases the plunger 5 in a direction away from the core 21 is set between the plunger 5 and the core 21, and when energization to the electromagnetic coil 22 is stopped, between the plunger 5 and the core 21. The acting adsorption force disappears, and the plunger 5 moves downward in the figure by the urging force of the spring 24.

  The plunger 5 is stored in a guide pipe 4 made of a nonmagnetic metal such as brass or aluminum, and the reciprocating movement of the plunger 5 is guided by the guide pipe 4.

  Referring also to FIG. 2, a bottom 41 is formed at one end of the guide pipe 4, and a valve port 42 is opened at the bottom 41. A rubber valve body 51 is attached to the lower end of the plunger 5. When the plunger 5 is moved downward by the urging force of the spring 24, the valve body 51 is seated on the bottom 41 and closes the valve opening 42. . In the present embodiment, four inflow ports 43 are provided in the cylindrical portion of the guide pipe 4 and in the vicinity of the bottom 41 at equal intervals in the circumferential direction.

  When the guide pipe 4 is set at a proper position, the O-ring 25 attached to the core 21 is brought into close contact with the inner peripheral surface of the guide pipe 4 and the space between the core 21 and the inner peripheral surface of the guide pipe 4 is hermetically sealed. To seal.

  The piping block 3 is formed with an inflow pipe 31 through which gas flows in and an outflow pipe 32 through which gas flows out. An opening is formed between the inflow pipe 31 and the outflow pipe 32. A space 33 is formed. And the drive part 2 and the piping block 3 are connected so that the end of the said guide pipe 4 may be inserted in this space 33. FIG. The inner side of the guide pipe 4 is hermetically sealed with the O-ring 25, but the outer peripheral surface side of the guide pipe 4 is hermetically sealed with an annular seal packing 35. In addition, a gasket 34 is attached so that the gas does not shortcut from the inflow conduit 31 to the outflow conduit 32 without passing through the valve port 42.

  As shown in FIG. 1, when the drive unit 2 and the piping block 3 are connected, the guide pipe 4 cannot be removed. However, before the driving unit 2 is fixed to the piping block 3, the guide pipe 4 can be removed. It can be attached and detached freely.

  With reference to FIG. 3, the guide pipe 4 is held only by the frictional force between the O-ring 25 attached to the core 21 as described above. This frictional force can hold the guide pipe 4 against the urging force of the spring 24 acting on the plunger 5, but if the one end side of the guide pipe 4 is gripped and pulled out, the guide pipe 4 is easily driven. It is a size that can be removed from the portion 2.

  Therefore, it is possible to check the valve closing state of the valve body 51 before connecting the driving unit 2 to the piping block 3 with the guide pipe 4 attached to the driving unit 2. If there is an abnormality in the valve body 51 or the guide pipe 4 and the valve body 51 does not close completely, the guide pipe 4 or the plunger 5 is replaced, and the guide pipe 4 is attached to the drive unit 2 again.

  Since the four inflow ports 43 are formed in the cylindrical portion of the guide pipe 4, the guide pipe 4 can be mounted without worrying about the phase of the guide pipe 4 when the guide pipe 4 is attached to the drive unit 2. What is necessary is just to insert in the drive part 2.

  By the way, even if the guide pipe 4 is slightly inclined, the relative positional relationship between the plunger 5 and the valve port 42 is kept constant, and there is no problem in closing the valve body 51, but the guide pipe 4 is prevented from being inclined. In order to do so, as shown in FIG. 4, the outer peripheral surface 21 a of the core 21 may be fitted to the inner peripheral surface of the guide pipe 4. Further, when the guide pipe 4 cannot be reliably held only by the frictional force of the O-ring 25, an elastic deformation portion 22 b is provided on the resin bobbin 22 a of the electromagnetic coil 22, and this elastic deformation portion 22 b is connected to the outer periphery of the guide pipe 4. You may comprise so that it may contact | abut to a surface.

  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 Diagram showing details of guide pipe The figure which shows the attachment or detachment state of the guide pipe The figure which shows other embodiment of the other end part of a guide pipe

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Drive part 3 Piping block 4 Guide pipe 5 Plunger 42 Valve port 51 Valve body

Claims (2)

An electromagnetic valve having an electromagnetic coil energized from the outside, provided with a plunger that reciprocates by electromagnetic force generated by the electromagnetic coil, and that opens and closes a valve port provided in the middle of the gas passage by a valve body provided at the tip of the plunger A spring that presses the valve body against the valve opening via the plunger and has a guide pipe that surrounds the plunger and guides the reciprocating movement of the plunger. A valve opening is formed at one end, and a space that is located in the middle of the piping and opens to the outside is formed in the piping block in which the gas passage is formed, and one end of the guide pipe is inserted into this space. , in a state before fixing the electromagnetic coil to the pipe block, said bar acting in the direction to pull the guide pipe via the plunger in a state of enclosing the guide pipe Against the biasing force of the holding means for removably hold a normal position with respect to the conductive magnetic coil guide pipe, in contact with the inner peripheral surface of the guide pipe guide pipe of the gas guide pipe A seal member is provided to prevent leakage from the other end, and the guide pipe is held in a normal position against the biasing force of the spring by the frictional force between the seal member and the inner peripheral surface of the guide pipe. Characteristic solenoid valve.   The space formed in the piping block is provided with an inflow conduit that opens laterally with respect to this space, and the guide pipe is inserted into this space, regardless of the mounting phase of the guide pipe. The solenoid valve according to claim 1, wherein a plurality of inlets for allowing the gas from the inflow pipe to flow into the guide pipe are opened in the guide pipe.

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