JP6046062B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve provided with a plunger cushioning means for reducing a collision sound of a movable plunger that moves forward and backward by the action of electromagnetic force.

  In general, a solenoid valve has a movable plunger that moves back and forth by the action of electromagnetic force, so when the displaced movable plunger stops, it collides with a column or the like on the fixed side and generates unnecessary collision noise. There is. Therefore, this type of solenoid valve is usually provided with a buffer means for reducing collision noise.

  Conventionally, electromagnetic valves disclosed in Patent Documents 1 to 3 are known as electromagnetic valves provided with such buffering means. The electromagnetic valve disclosed in Patent Document 1 aims to reduce the operating noise associated with the seating of the valve body and to reliably shut off the inlet and the outlet by the valve body seating on the valve seat. Specifically, the valve body is composed of a valve body made of a magnetic material and an elastic member, a valve seat side seal portion is provided on the valve seat contact side of the valve body, and the core contact side is provided. A core-side stopper is provided. In addition, the electromagnetic valve disclosed in the same document 2 is intended to reduce the operating sound generated during opening and closing operations, and is attached to a cap fixed around an adjustment screw with a center hole screwed into a fixed iron core. An oil sump is made and the impact sound of the movable iron core is released to the outside through the hydraulic oil in the oil sump. Furthermore, the electromagnetic valve disclosed in the same document 3 is an electromagnetic valve that can reduce the collision sound when the valve is closed without being affected by the hardness of the elastic member provided at the contact portion of the valve body when the valve is closed. At the same time, the purpose is to reduce the collision noise when the valve is opened. The valve seat is loosely fitted to the passage housing and fixed through an O-ring. A predetermined gap is provided between the first and second locking portions.

Japanese Patent Laid-Open No. 7-224962 JP-A-11-218254 JP 2001-208235 A

  However, the conventional solenoid valve described above has the following problems.

  First, when used in a medical device that supplies a chemical solution, a test solution, or the like, since it is particularly required to be quiet during operation, it is desirable to reduce unnecessary sounds such as a collision sound as much as possible. That is, in such an application, it is necessary to reduce the absolute magnitude of the generated collision sound as much as possible. However, as in the conventional case, the buffer means that directly uses physical properties such as oil and rubber is naturally used as the buffer means. There was room for further improvement, such as limitations.

  Second, as a buffering means, the physical properties of oil, rubber, etc. are used directly, so to speak, the buffering properties of the material itself are used directly, so that the volume shrinks due to temperature or the physical properties deteriorate due to long-term use, etc. It is easy to change the buffer capacity directly. Therefore, due to the temperature environment used and aging deterioration, the ability to absorb the collision sound changes, and the magnitude of the generated collision sound also changes.

  The object of the present invention is to provide an electromagnetic valve that solves the problems in the background art.

  In order to solve the above-described problems, the present invention provides a fixed arrangement arranged on one end side when the electromagnetic valve 1 is provided with a plunger buffering means for reducing the collision sound of the movable plunger 2 that moves forward and backward by the action of electromagnetic force. The first ring portion 3c serving as an end, the second ring portion 3m serving as a movable end that is disposed on the other end side and locked to the movable plunger 2, and the both ends are disposed at equal intervals in the circumferential direction. By integrating the first ring part 3c and the second ring part 3m, respectively, and having at least a part of the inclined part S, the second ring part 3m can be elastically displaced with respect to the first ring part 3c. A plunger buffering means using a buffer body 3 formed by integrally molding three or more buffer link portions 3ra, 3rb, 3rc with a resin material is provided.

  In this case, according to a preferred aspect of the invention, the resin material can contain at least one of a polyoxymethylene resin and a polyether ether ketone resin. Further, the first ring portion 3c can be locked to the fixed portion 4 side, and the second ring portion 3m can be locked to the front end 2f side of the movable plunger 2 protruding forward from the fixed portion 4. On the other hand, the first ring portion 3 c can be integrally provided with a wear ring portion 11 that protrudes in the axial direction from the end surface 3 cs of the first ring portion 3 c and is inserted into the inner peripheral surface side of the fixed portion 4. Further, the second ring portion 3m is engaged with a stopper body 12 attached to the peripheral surface of the movable plunger 2 on the front end 2f side, or on an engaging portion 2fss formed on the peripheral surface of the movable plunger 2 on the front end 2f side. The stopper portion 13 that can be locked can be provided integrally.

  According to the solenoid valve 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Since a resin material is used, the buffer performance can be easily changed by changing the shape and the like, and the degree of freedom in designing the buffer performance can be increased. Therefore, the buffer performance can be optimized in accordance with the type of the electromagnetic valve, and the magnitude of the generated collision sound can be minimized. As a result, it is optimally used for supply control of a chemical solution, a test solution, and the like in a medical device that requires quietness in use.

  (2) Since the deformation of the buffer formed by the resin material is used, it is hardly affected by volume shrinkage due to temperature or deterioration of physical properties due to long-term use. Therefore, it is possible to eliminate problems such as a change in the absorption capacity with respect to the collision sound due to the temperature environment used and aging deterioration, that is, the magnitude of the generated collision sound (variation). As a result, even if a collision sound is generated, it can contribute to the stabilization of the magnitude and quality of the collision sound.

  (3) Mass production and easy molding are possible as an integrated part made of a resin material, so that it can be manufactured at low cost.

  (4) Since at least three buffer links 3ra, 3rb, 3rc are provided at equal intervals in the circumferential direction, it is possible to prevent buckling from affecting the posture of the movable plunger 2 and to achieve stable displacement. Operation can be secured.

  (5) If at least one of a polyoxymethylene resin and a polyetheretherketone resin is included in the resin material according to a preferred embodiment, the use of a general-purpose material can contribute to cost reduction and ease of production.

  (6) According to a preferred embodiment, the first ring portion 3c is locked to the fixed portion 4 side, and the second ring portion 3m is locked to the front end 2f side of the movable plunger 2 protruding forward from the fixed portion 4. By doing so, it is possible to contribute to facilitating assembly and miniaturization by using the peripheral surface of the movable plunger 2.

  (7) According to a preferred embodiment, the first ring portion 3 c is integrally provided with a wear ring portion 11 that protrudes in the axial direction from the end surface 3 cs of the first ring portion 3 c and is inserted into the inner peripheral surface side of the fixed portion 4. Thus, since the wear ring function can be easily added (added), the wear of the movable plunger 2 can be reduced, and the operation (smoothing) associated therewith and the life of the shock absorber 3 can be extended.

  (8) According to a preferred embodiment, the second ring portion 3m is locked to the stopper body 12 attached to the peripheral surface of the movable plunger 2 on the front end 2f side or formed on the peripheral surface of the movable plunger 2 on the front end 2f side. Diversification at the time of assembling can be achieved, for example, the stopper portion 13 that is locked to the locking portion 2fss can be integrally provided. In particular, if it is locked to the stopper body 12 attached to the peripheral surface of the movable plunger 2 on the front end 2f side, the movable plunger 2 can be reliably locked without impairing the shape of the movable plunger 2, and the front end 2f of the movable plunger 2 can be secured. If the stopper portion 13 that is locked to the locking portion 2 fss formed on the peripheral surface on the side is provided integrally, it can be reliably locked without using another component such as the stopper body 12.

Side sectional view of a solenoid valve according to a preferred embodiment of the present invention, AA line sectional view of the electromagnetic valve in FIG. Side view of shock absorber used for the solenoid valve, FIG. 3 is a cross-sectional view of the shock absorber used in the electromagnetic valve in FIG. Rear view of the buffer used for the solenoid valve, Side view of the movable plunger in the solenoid valve, Action diagram of the solenoid valve, A cross-sectional side view showing a modification of the form of the buffer used for the electromagnetic valve, Sectional side view showing a modified example of the assembly structure of the buffer used for the electromagnetic valve, A half-cut perspective view showing another modification of the buffer used in the electromagnetic valve,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, an overall schematic configuration of the electromagnetic valve 1 according to the present embodiment will be described with reference to FIGS. 1, 2, and 7.

  As shown in FIGS. 1 and 7, the solenoid valve 1 includes a housing 21 positioned at the outermost wall. The housing 21 includes a housing body 22 having a rectangular cross section, and has a channel opening / closing block 23 on one end side (front end side) of the housing body 22, and on the other end side (rear end side) of the housing body 22. The wiring part 24 is provided. Reference numeral 61 denotes a mounting bracket fixed to the bottom surface of the housing 21, and the solenoid valve 1 can be detachably mounted on the DIN rail using the mounting bracket 61.

  In this case, as shown in FIG. 7, the channel opening / closing block 23 has an inlet 23 i for the liquid L and an outlet 23 e communicating with the inlet 23 i via the channels 23 ri and 23 re. Between 23ri and the flow path 23re, there is a valve body accommodating chamber 23s. The flow path 23re facing the valve body accommodating chamber 23s also serves as the valve seat portion 25. On the other hand, the wiring portion 24 includes a wiring relay board 26, to which a connection cord (not shown) led out to the outside is connected and an end portion of a coil wire W to be described later is connected.

  On the other hand, the housing main body 22 is formed to be hollow inside, and accommodates the yoke portion 31 near the rear end, and accommodates the coil portion 32 formed by winding the coil wire W around the coil bobbin 32b inside the yoke portion 31. . In addition, a column (stator) 33 is built in the latter half of the coil bobbin 32 b and the rear end of the column 33 is coupled to the rear end surface 31 r of the yoke portion 31. Therefore, the yoke part 31, the coil part 32, and the column 33 constitute the fixed part 4.

  Further, the movable plunger 2 is housed in the coil bobbin 32b in front of the column 33 so as to be able to move forward and backward, and the front portion of the movable plunger 2 is provided on the front end surface 31f of the yoke portion 31 as a buffer mounting portion 2fs. It protrudes forward from the open hole 31fh. In this case, the shock absorber mounting portion 2fs of the movable plunger 2 is formed to have a smaller diameter than the plunger main body portion 2m on the rear end side. Further, a rubber valve body portion 34 formed in a cylindrical shape is fixed to the front end 2f of the movable plunger 2, and the valve body portion 34 is accommodated in the valve body accommodating chamber 23s described above. The front end surface of the valve body portion 34 faces the valve seat portion 25 described above, and is pressed against the valve seat portion 25 by the displacement of the movable plunger 2 to block the flow path 23re, and is separated from the valve seat portion 25. The flow path 23re can be opened. The valve body 34 is integrally formed with a flange-shaped flange 34 f on the outer peripheral surface, and the flange 34 f is held between the housing body 22 and the flow path opening / closing block 23.

  On the other hand, a buffer body 3 serving as a plunger buffer means is disposed on the peripheral surface of the buffer body mounting portion 2fs of the movable plunger 2. The buffer 3 constitutes a main part of the electromagnetic valve 1 according to the present embodiment, and will be specifically described below.

  First, the structure and assembly structure of the buffer body 3 are demonstrated with reference to FIGS. As shown in FIG. 3, the buffer body 3 is disposed on the first ring portion 3 c serving as a fixed end disposed on one end side (rear end side) and on the other end side (front end side), and is associated with the movable plunger 2. The second ring portion 3m, which is a movable end to be stopped, and both ends are integrated with the first ring portion 3c and the second ring portion 3m, respectively, and at least part of the first ring portion 3c is provided with an inclined portion S. On the other hand, a plurality of buffer link portions 3ra, 3rb, and 3rc that enable elastic displacement of the second ring portion 3m are provided, and these are integrally formed using a resin material.

  The embodiment shows a case where three buffer link portions 3ra, 3rb, and 3rc are provided, which are arranged at equal intervals in the circumferential direction. Thus, if at least three or more buffer link portions 3ra, 3rb, and 3rc are provided at equal intervals in the circumferential direction, it is possible to prevent the occurrence of buckling that affects the posture of the movable plunger 2 and to achieve stable displacement. There is an advantage that operation can be secured. In the case of the example, one buffer link portion 3ra (3rb, 3rc is the same) includes a first inclined portion S extending from the first ring portion 3c at an angle of approximately 45 °, and an approximately 45 [ °] It is integrally formed by the inclined second extending inclined portion S and the intermediate portion Sp provided between the first inclined portion S and the second inclined portion S. The intermediate portion Sp has a shape parallel to the first ring portion 3c and along the first ring portion 3c. Further, on the end surface side of the outer peripheral surface of the second ring portion 3m, a spring locking portion 3ms having a larger diameter than this outer peripheral surface is integrally formed, and on the end surface side of the inner peripheral surface of the second ring portion 3m, The locking ring portion 3mc having a smaller diameter than the inner peripheral surface is integrally formed. Since the buffer body 3 having such a configuration enables mass production and easy molding as an integrated part made of a resin material, there is an advantage that it can be manufactured at low cost.

  The resin material used as the forming material is not particularly limited in type, but as an example, polyoxymethylene resin (POM), polyetheretherketone resin (PEEK) or the like is desirable. Thus, if at least one of POM and PEEK is included as a resin material, there is an advantage that it is possible to contribute to cost reduction and production ease by using a general-purpose material.

  On the other hand, the buffer body 3 configured as described above can be assembled to the movable plunger 2 as follows. First, a step locking portion 41 having a small diameter on the front side is formed on the outer peripheral surface of the shock absorber mounting portion 2fs of the movable plunger 2, and the ring groove portion 42 is spaced from the step locking portion 41 forward by a predetermined distance. Form. Then, as shown in FIG. 6, the buffer body mounting portion 2 fs of the movable plunger 2 is inserted into the buffer body 3 from the first ring portion 3 c side, and thereafter, the stopper body 12 such as an E ring is inserted into the ring groove portion 42. Wear. Accordingly, the locking ring portion 3mc of the second ring portion 3m is sandwiched and fixed between the step locking portion 41 and the stopper body 12, and the first ring portion 3c is fixed to the plunger main body portion 2m and the shock absorber mounting portion 2fs. It is in contact with the step portion 2 ms between them or the front end surface 31 f of the yoke portion 31 to be regulated, that is, the position is fixed.

  Thus, the buffer 3 locks the first ring portion 3c to the fixed portion 4 side, and locks the second ring portion 3m to the front end 2f side of the movable plunger 2 protruding forward from the fixed portion 4. Therefore, there is an advantage that it is possible to contribute to easy assembly and miniaturization by using the peripheral surface of the movable plunger 2.

  Next, an entire assembly method of the electromagnetic valve 1 according to the present embodiment will be described with reference to FIGS. 1 and 6.

  First, as shown in FIG. 1, a coil portion 32 formed by winding a coil wire W around a coil bobbin 32b is accommodated in a yoke portion 31, and a column 33 is assembled in the coil bobbin 32b.

  Next, the movable plunger 2 assembled with the buffer 3 is accommodated in the coil bobbin 32b from the front end side. At this time, the spring 51 is loaded on the outer peripheral surface of the buffer 3. Thereby, the front end side of the spring 51 is locked to the spring locking portion 3 ms, and the rear end side is locked to the front end surface 31 f of the yoke portion 31. Thereafter, the assembled yoke portion 31 is accommodated from the rear end side with respect to the housing main body 22, and the yoke portion 31 and the housing main body 22 are fixed using a fixing screw or the like (not shown). On the other hand, the flow path opening / closing block 23 is attached to the front end of the housing body 22, and the flange 34 f of the valve body 34 described above is interposed between the housing body 22 and the flow path opening / closing block 23. Thereby, the main part in the whole solenoid valve 1 can be assembled.

  Next, the operation and action of the electromagnetic valve 1 according to the present embodiment will be described with reference to FIGS.

  FIG. 1 shows a state when the solenoid valve 1 is not energized. In this case, the electromagnetic force based on the coil part 32 (fixed part 4) is not generated. Therefore, the movable plunger 2 is pressed forward by the elastic force of the buffer 3 and the elastic force of the spring 51, and the tip 2 f of the movable plunger 2 presses the valve body 34. As a result, the front end surface of the valve body portion 34 is in pressure contact with the valve seat portion 25 to block the flow path 23re. At this time, the rear end of the movable plunger 2 is separated from the front end of the column 33. In the case of illustration, the gap when spaced apart is approximately 1 [mm].

  On the other hand, FIG. 7 shows a state when the solenoid valve 1 is energized. In this case, an electromagnetic force is generated from the fixed portion 4 by the excitation of the coil portion 32. As a result, the movable plunger 2 is attracted to the column 33 side against the elastic force of the buffer 3 and the elastic force of the spring 51, and the movable plunger 2 and the valve body 34 are displaced to the positions shown in FIG. That is, the front end surface of the valve body portion 34 is separated from the valve seat portion 25 by the stroke Gs to open the flow path 23re. Thereby, the liquid (chemical solution, test solution, etc.) L flowing in from the inflow port 23i is inflow port 23i → flow path 23ri → valve housing chamber 23s → flow path 23re (valve seat portion 25) → It flows through the route of the outlet 23e.

  By the way, when energized, the movable plunger 2 is displaced to the column 33 side and finally comes into contact with the column 33. When the movable plunger 2 is displaced, the displacement speed is relaxed by the elastic force of the buffer body 3, so that when the movable plunger 2 abuts the column 33, the collision occurs at a speed at which almost no collision sound is generated. In this case, it is possible to avoid the generation of the collision sound by optimizing the speed. In particular, since this type of solenoid valve 1 requires both a high switching speed and a low noise, it is possible to optimize the speed by selecting the material and form (shape and configuration) of the buffer 3. Can be achieved.

  Thus, according to the solenoid valve 1 according to the present embodiment, since the resin material is used, the buffer performance can be easily changed by changing the shape and the like, and the degree of freedom in designing the buffer performance can be increased. it can. Therefore, the buffer performance can be optimized in accordance with the type of the electromagnetic valve, and the magnitude of the generated collision sound can be minimized. As a result, it is optimally used for supply control of a chemical solution, a test solution, and the like in a medical device that requires quietness in use.

  Moreover, since the deformation of the buffer formed by the resin material is used, it is hardly affected by volume shrinkage due to temperature, deterioration of physical properties due to long-term use, and the like. Therefore, it is possible to eliminate problems such as a change in the absorption capacity with respect to the collision sound due to the temperature environment used and aging deterioration, that is, the magnitude of the generated collision sound (variation). As a result, even if a collision sound is generated, it can contribute to the stabilization of the magnitude and quality of the collision sound.

  On the other hand, FIGS. 8-10 shows the example of a change of the solenoid valve 1 which concerns on this embodiment. 8 is a modified example of the buffer body 3 used in the electromagnetic valve 1, FIG. 9 is a modified example of the assembly structure of the buffer body 3 used in the electromagnetic valve 1, and FIG. 10 is a buffer body reflecting both FIG. 8 and FIG. Three modification examples are shown respectively.

  In FIG. 8, the first ring portion 3 c is integrally provided with a wear ring portion 11 that protrudes in the axial direction from the end surface 3 cs of the first ring portion 3 c and is inserted into the inner peripheral surface side of the fixed portion 4. In the case of the basic embodiment shown in FIG. 1, the outer peripheral surface of the movable plunger 2 is always in contact with the inner peripheral surface of the opening portion 31 fh provided in the front end surface 31 f of the yoke portion 31, but the wear ring portion 11. By providing them integrally, a wear ring function can be easily added (added). As a result, as shown in FIG. 8, a constant gap Gp can be provided along the circumferential direction between the outer peripheral surface of the movable plunger 2 and the inner peripheral surface of the opening portion 31fh. In addition to the reduction, the operation can be stabilized (smoothed) and the life of the shock absorber 3 can be extended.

  FIG. 9 shows an end surface of the second ring portion 3m of the buffer body 3 provided with a locking portion 2fss by a concave groove along the circumferential direction on the outer peripheral surface of the buffer body mounting portion 2fs on the front end 2f side of the movable plunger 2. A plurality of (three in the illustration) stopper portions 13 projecting in the axial direction from 3mc are integrally provided. In this case, the plurality of stopper portions 13 are inclined so that the tips are closer to the center. In the case of the basic embodiment shown in FIG. 1, the second ring portion 3m is locked to the stopper body 12 attached to the outer peripheral surface of the shock absorber mounting portion 2fs on the front end 2f side of the movable plunger 2. However, in the case of the modification shown in FIG. 9, the second ring portion 3 m is fixed to the peripheral surface of the movable plunger 2 by locking the tips of the stopper portions 13 to the locking portions 2 fss. did. In this way, when assembling the buffer body 3, it is possible to diversify at the time of assembling, such as being able to select either FIG. 1 or FIG. In particular, as shown in FIG. 1, if the stopper is attached to a stopper body 12 attached to the peripheral surface of the movable plunger 2 on the front end 2f side, the movable plunger 2 can be reliably locked without impairing the shape. If the stopper portion 13 that is locked to the locking portion 2 fss formed on the peripheral surface on the front end 2 f side of the movable plunger 2 is provided integrally, the stopper can be reliably locked without using another component such as the stopper body 12.

  FIG. 10 shows a half-cut perspective view which is another modified example of the buffer 3 used in the electromagnetic valve 1. Specifically, the wear ring part 11 shown in FIG. 8 and the stopper part 13 shown in FIG. An example of change reflecting both will be shown. 8 to 10, the same parts as those in FIGS. 1 to 7 are denoted by the same reference numerals to clarify the configuration, and detailed description thereof is omitted.

  The preferred embodiments including the modified examples have been described in detail above. However, the present invention is not limited to such embodiments, and the detailed configuration, shape, material, quantity, numerical values, and the like of the present invention are not limited thereto. Changes, additions and deletions can be made arbitrarily without departing from the scope. For example, the collision sound of the movable plunger 2 is a concept including a sound that is generated when the movable plunger 2 directly collides and a sound that is indirectly generated from other parts based on the displacement of the movable plunger 2. Moreover, although three buffer link parts 3ra, 3rb, 3rc were illustrated as desirable embodiment, four or more may be sufficient. Furthermore, although the polyoxymethylene resin and the polyether ether ketone resin were illustrated as the resin material, other various resin materials (synthetic resin materials) can be used. On the other hand, although the 2-port valve has been exemplified as the electromagnetic valve 1, it can be applied to various types of electromagnetic valves including a 3-port valve and a 4-port valve.

  The electromagnetic valve according to the present invention can be used by being connected to various flow paths through which various liquids and gases circulate, including the use of supplying and controlling chemical solutions and test solutions in medical devices.

  1: solenoid valve, 2: movable plunger, 2f: front end of movable plunger, 2fss: locking portion, 3: buffer body, 3c: first ring portion, 3m: second ring portion, 3ra: buffer link portion, 3rb: Buffer link part, 3rc: Buffer link part, 3cs: End surface of the first ring part, 4: Fixing part, 11: Wear ring part, 12: Stopper body, 13: Stopper part

Claims (5)

  In a solenoid valve provided with a plunger cushioning means for reducing the impact sound of a movable plunger that moves forward and backward by the action of electromagnetic force, a first ring portion serving as a fixed end disposed on one end side, disposed on the other end side, and A second ring portion that engages with the movable plunger serving as a movable end, and is arranged at equal intervals in the circumferential direction so that both end sides are integrated with the first ring portion side and the second ring portion side, respectively, and at least A buffer formed by integrally molding a resin material with at least three buffer link portions that allow the second ring portion to be elastically displaced with respect to the first ring portion by having an inclined portion in part. A solenoid valve comprising a plunger cushioning means using a body.   The solenoid valve according to claim 1, wherein the resin material includes at least one of a polyoxymethylene resin and a polyether ether ketone resin.   The first ring portion is locked to the fixed portion side, and the second ring portion is locked to the front end side of the movable plunger protruding forward from the fixed portion. Solenoid valve.   The said 1st ring part protrudes in the axial direction from the end surface of the said 1st ring part, and has the wear ring part integrally inserted in the inner peripheral surface side of the said fixing | fixed part, The characterized by the above-mentioned. Solenoid valve.   The second ring part is locked to a stopper body attached to the peripheral surface on the front end side of the movable plunger, or a stopper part to be locked to a locking part formed on the peripheral surface on the front end side of the movable plunger. The electromagnetic valve according to any one of claims 1 to 4, wherein the electromagnetic valve is provided on the electromagnetic valve.

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