JP7135705B2 - solenoid valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic valve that opens by generating magnetic flux through energization control.

A solenoid valve generally has a movable valve, a movable core, a fixed core, and a coil. The movable valve is provided so as to be able to rise and fall within a predetermined range, and opens the flow channel by rising and closes the flow channel by falling. The movable core is a magnetic body provided so as to rise and fall together with the movable valve. The fixed core is a magnetic body fixed above the movable core. When the coil is energized, it generates a magnetic flux that attracts the movable core to the stationary core, lifting the movable core and the movable valve. As a document showing such an electromagnetic valve, for example, there is Patent Document 1 shown below.

JP 2007-100643 A

In such a solenoid valve, when the valve is opened, the gap (space) between the movable core and the fixed core becomes smaller as the movable core is attracted to the fixed core and approaches the fixed core. pulling power increases. As a result, the movable valve rises to the maximum within the predetermined range, and the collision speed when the movable core or the movable valve or the like collides with the fixed core or the stopper or the like increases. On the other hand, when trying to suppress the collision speed by controlling the energization of the coil, it is necessary to grasp the positions of the movable core and the movable valve. Therefore, complicated energization control is required, resulting in high cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the collision speed when a movable core or a movable valve or the like collides with a fixed core or a stopper or the like without performing complicated energization control for the coil. do.

A solenoid valve of the present invention has a movable valve, a movable core, a fixed core, and a coil. The movable valve is provided movably in an opening/closing direction within a predetermined range, and when moved in an opening direction, which is one of the opening/closing directions, the valve opens a fluid flow path, and in a direction opposite to the opening direction. The passage is closed by moving in a certain closing direction. The movable core is a magnetic body provided so as to move in the opening/closing direction together with the movable valve. The fixed core is a magnetic body that is fixed closer to the opening direction than the movable core. When the coil is energized, it generates a driving magnetic flux that attracts the movable core to the fixed core, thereby moving the movable core and the movable valve in the opening direction.

The solenoid valve has a magnetic detour. The magnetic detour portion is made of a magnetic material, and increases the amount of detouring magnetic flux different from the driving magnetic flux as the movable core moves in the opening direction. By increasing the magnetic flux amount of the detouring magnetic flux by the magnetic detour portion, the electromagnetic valve suppresses the magnetic flux amount of the driving magnetic flux compared to a case where the magnetic bypass section does not increase the magnetic flux amount.

According to the present invention, by increasing the magnetic flux amount of the detouring magnetic flux as the movable core moves in the opening direction, the magnetic flux amount of the driving magnetic flux is suppressed and the force that attracts the movable core in the opening direction is suppressed. Therefore, the movable valve is displaced in the maximum opening direction within a predetermined range, and the collision speed when the movable core or the movable valve or the like collides with the fixed core or the stopper or the like can be suppressed. Therefore, it is possible to soften the impact and improve the durability of the movable core, the movable valve, etc., and the fixed core, the stopper, etc.

Furthermore, the force that draws the movable core toward the fixed core is not suppressed by controlling the energization of the coil. by increasing the amount of magnetic flux. Therefore, the collision speed can be suppressed without performing complicated energization control for the coil.

Sectional drawing which shows the engine of 1st Embodiment Sectional view showing an engine solenoid valve Sectional view showing when the first valve of the solenoid valve is opened Sectional view showing when the second valve of the solenoid valve is opened Sectional view showing a mechanism for suppressing the opening speed of the second valve Sectional drawing which shows the solenoid valve of 2nd Embodiment Sectional view showing when the first valve of the solenoid valve is opened Sectional view showing when the second valve of the solenoid valve is opened Sectional view showing a mechanism for suppressing the opening speed of the second valve Sectional view showing the solenoid valve of the present embodiment and the solenoid valve of the comparative example Graph showing time change of force applied to the second valve Sectional drawing which shows the solenoid valve of 3rd Embodiment Sectional drawing which shows the solenoid valve of 4th Embodiment Sectional drawing which shows the solenoid valve of 5th Embodiment Sectional drawing which shows the solenoid valve of 6th Embodiment Sectional drawing which shows the solenoid valve of 7th Embodiment Sectional drawing which shows the electromagnetic valve of 8th Embodiment

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be modified as appropriate without departing from the gist of the invention.

[First embodiment]
FIG. 1 is a sectional view showing a solenoid valve 99a of this embodiment and an internal combustion engine 90 in which the solenoid valve 99a is mounted. The internal combustion engine 90 has a cylinder 93 and a piston 94 installed therein so as to be able to reciprocate. An intake passage 91 and an exhaust passage 96 communicate with each other in the upper portion of the cylinder 93 . An intake valve 92 is provided in the intake passage 91 and an exhaust valve 95 is provided in the exhaust passage 96 . An electromagnetic valve 99 a is provided for the intake passage 91 . The solenoid valve 99 a is a fuel injection valve that injects fuel into the intake passage 91 . A fuel supply pipe 98 for supplying fuel is connected to the solenoid valve 99a. The fuel injected by the solenoid valve 99a may be gas fuel or liquid fuel such as gasoline or light oil. These gas fuel and liquid fuel correspond to the "fluid" in the present invention.

FIG. 2 is a sectional view showing the solenoid valve 99a. In the following description, one side of the electromagnetic valve 99a in the length direction will be referred to as "lower" and the other side will be referred to as "upper" in accordance with the drawings. However, the solenoid valve 99a can be installed in any direction, such as by setting its length direction obliquely with respect to the vertical direction as shown in FIG. can be done. The downward direction in this embodiment corresponds to the "closed direction" in the present invention, and the upward direction in the present embodiment corresponds to the "open direction" in the present invention.

The solenoid valve 99 a has a housing 10 , a coil 20 , a fixed core 30 , a first core 40 , a first valve 45 , a second core 60 and a second valve 65 . The housing 10 is a cylindrical member, and has an annular non-magnetic material portion 12 formed of a non-magnetic material at the upper and lower middle portions thereof. Portions of the housing 10 other than the non-magnetic material portion 12 are made of a magnetic material. A bottom member 13 is provided inside the lower end of the housing 10 . The bottom member 13 is provided with a through-hole-shaped first flow path 14 and a second flow path 16 . Hereinafter, the upper portion of the housing 10 above the non-magnetic portion 12 will be referred to as the "upper portion of the housing 10", and the lower portion of the housing 10 below the non-magnetic portion 12 will be referred to as the "lower portion of the housing 10".

A coil 20 is installed around the top of the housing 10 . A magnetic coil holding member 25 is provided around the coil 20 to hold the coil 20 in the housing 10 . A magnetic fixed core 30 is installed inside the upper portion of the housing 10 . The fixed core 30 is a tubular member, and its tubular hole 35 constitutes a part of the fuel passage. A cylindrical fixing member 33 is attached to the tubular hole 35 of the fixed core 30 , and a first spring 34 is attached between the fixing member 33 and the first core 40 . The lower end surface of the fixed core 30 abuts against the upper end surface of the first core 40 and the upper end surface of the second core 60, thereby serving as a stopper that limits the upward movement of the first core 40 and the second core 60. there is

The first valve 45 is a non-magnetic material, and is installed below the fixed core 30 inside the housing 10 so as to be able to move up and down. A first hole 46 forming part of the fuel passage is provided inside the first valve 45 . A first seal 48 for closing the first flow path 14 is provided at the lower end of the first valve 45 .

The first core 40 is a ring-shaped magnetic body, and is fixed to the upper portion of the first valve 45 so as to be externally fitted. Therefore, the first core 40 and the first valve 45 move up and down together. The lower portion of the first core 40 is narrower than the upper portion, and constitutes a magnetic throttle portion 51 for generating magnetic saturation. The upper portion of the first core 40 becomes wider in the left and right direction as it goes upward, and constitutes a magnetic detour portion 53 .

The fuel pressure applied from above to the first core 40 and the first valve 45 presses the first core 40 and the first valve 45 downward. The first spring 34 also presses the first core 40 and the first valve 45 downward. On the other hand, the fuel pressure applied to the first core 40 and the first valve 45 from below pushes the first core 40 and the first valve 45 upward. Moreover, the predetermined magnetic fluxes (f1, f3) generated by the coil 20 also pull the first core 40 and the first valve 45 upward. These force balance changes raise and lower the first core 40 and the first valve 45 .

The first valve 45 opens the first flow path 14 by going up, and closes the first flow path 14 by going down. When the first valve 45 opens, the fuel supplied from the fuel supply pipe 98 flows into the cylinder hole 35 , the first hole 46 , the space between the outer peripheral surface of the first valve 45 and the inner peripheral surface of the second valve 65 . , through the first flow path 14 and injected into the intake passage 91 .

The second valve 65 is a cylindrical non-magnetic body, and is fitted onto the first valve 45 so as to be able to move up and down. The second valve 65 is provided with a second hole 66 forming part of the fuel passage. A second seal 68 is provided at the lower end of the second valve 65 to block the second flow path 16 .

The second core 60 is an annular magnetic body, and is fitted on the first core 40 so as to be able to move up and down. Therefore, the second core 60 is arranged on the side of the first core 40 . The inner peripheral surface of the second core 60 is in sliding contact with the outer peripheral surface of the first core 40 . The second core 60 is fixed to the top of the second valve 65 . Therefore, the second core 60 and the second valve 65 move up and down together. A second spring 36 is interposed between the second core 60 and the fixed core 30 .

The fuel pressure applied to the second core 60 and the second valve 65 from above pushes the second core 60 and the second valve 65 downward. The second spring 36 also presses the second core 60 and the second valve 65 downward. On the other hand, the fuel pressure applied to the second core 60 and the second valve 65 from below pushes the second core 60 and the second valve 65 upward. A predetermined magnetic flux (f2) generated by the coil 20 also pulls the second core 60 and the second valve 65 upward. These force balance changes raise and lower the second core 60 and the second valve 65 .

The second valve 65 opens the second flow path 16 by going up, and closes the second flow path 16 by going down. When the second valve 65 opens, the fuel supplied from the fuel supply pipe 98 flows into the cylinder hole 35 , the first hole 46 , the space between the outer peripheral surface of the first valve 45 and the inner peripheral surface of the second valve 65 . , through the second flow path 16 and is injected into the intake passage 91 .

When both the first valve 45 and the second valve 65 are lowered and both are closed, the upper end surface of the first core 40 protrudes upward from the upper end surface of the second core 60 and is fixed. close to the core 30; As a result, the first core 40 and the first valve 45 rise and open earlier than the second core 60 and the second valve 65 . In addition, when both the first valve 45 and the second valve 65 are lowered and closed, the inner peripheral surface of the second core 60 is in sliding contact with the outer peripheral surface of the magnetic restrictor 51, and the magnetic detour is performed. It is not in sliding contact with the outer peripheral surface of the portion 53 .

FIG. 3 shows the opening of the first valve 45 . When opening the first valve 45, the coil 20 is first energized with a predetermined amount of current. The current generates a first magnetic flux f1 as shown in FIG. 3(a). The first magnetic flux f1 passes through the fixed core 30, the upper part of the housing 10, the coil holding member 25, the lower part of the housing 10, the second core 60, the first core 40, and the space between the first core 40 and the fixed core 30. It is an annular magnetic flux that passes through and flows to the fixed core 30 again. The first magnetic flux f1 generates a force that attracts the first core 40 to the fixed core 30 . Due to this force, the force pushing the first core 40 and the first valve 45 upward exceeds the force pushing them downward. As a result, as shown in FIG. 3B, the first core 40 and the first valve 45 are lifted and the first core 40 abuts against the fixed core 30 .

FIG. 4 shows the opening of the second valve 65 thereafter. When opening the second valve 65, the amount of current flowing through the coil 20 is increased. Due to the increase in the current, the first magnetic flux f1 increases, and magnetic saturation occurs in the magnetic throttle portion 51 of the first core 40 . Thereby, as shown in FIG. 4A, a second magnetic flux f2 is generated. The second magnetic flux f2 passes through the fixed core 30, the upper part of the housing 10, the coil holding member 25, the lower part of the housing 10, the second core 60, the space between the second core 60 and the fixed core 30, It is an annular magnetic flux flowing through the core 30 . A force that draws the second core 60 toward the fixed core 30 is generated by the second magnetic flux f2. Due to this force, the upward pressing force on the second core 60 and the second valve 65 exceeds the downward pressing force. Thereby, as shown in FIG. 4B, the second core 60 and the second valve 65 are raised. As the second core 60 rises, the gap (space) between the second core 60 and the fixed core 30 becomes smaller, thereby increasing the upward attracting force on the second core 60 .

FIG. 5 shows a mechanism for suppressing the rising speed of the second valve 65 after that. As shown in FIG. 5(a), when the second core 60 and the second valve 65 are lifted and the inner peripheral surface of the second core 60 is in sliding contact with the outer peripheral surface of the magnetic detour portion 53 of the first core 40, , part of the first magnetic flux f1 begins to flow directly to the magnetic detour portion 53 without passing through the magnetic constriction portion 51, so that the amount of the first magnetic flux f1 begins to increase. Since the magnetic detour portion 53 becomes wider in the horizontal direction as it goes upward, the magnetic flux flowing through the magnetic detour portion 53 increases as the second core 60 rises, and the amount of the first magnetic flux f1 increases. . As a result, the magnetic flux amount of the second magnetic flux f2 is suppressed, and the ascending speed of the second core 60 and the second valve 65 is suppressed accordingly. In this state, the second core 60 contacts the fixed core 30 as shown in FIG. 5(b).

Next, by decreasing the current applied to the coil 20, the first valve 45 and the second valve 65 are sequentially lowered and closed. The first valve 45 may be set to close first, or the second valve 65 may be set to close first. These settings include the pressing force of the first spring 34, the pressing force of the second spring 36, the fuel pressure applied to the first core 40 and the first valve 45, and the fuel pressure applied to the second core 60 and the second valve 65. It can be changed by setting the pressure, the first magnetic flux f1, the second magnetic flux f2, and the like.

According to this embodiment, the following effects are obtained. Since the first valve 45 and the second valve 65 are provided, the fuel injection amount can be controlled in two stages. Further, in the present embodiment, the first magnetic flux f1 is generated by energizing the coil 20, thereby raising the first core 40 and the first valve 45. As shown in FIG. After that, magnetic saturation occurs in the magnetic diaphragm portion 51, thereby generating the second magnetic flux f2. The second magnetic flux f2 raises the second core 60 and the second valve 65 . Therefore, only one coil 20 can open the first valve 45 and the second valve 65 in order. Therefore, it is not necessary to separately provide a coil for driving the first valve 45 and a coil for driving the second valve 65, and the configuration of the electromagnetic valve 99a can be simplified.

Further, when opening the second valve 65, the magnetic flux amount of the first magnetic flux f1 is increased as the second core 60 rises. As a result, the magnetic flux amount of the second magnetic flux f2 is suppressed and the force that attracts the second core 60 to the fixed core 30 is suppressed compared to the case where the second magnetic flux f2 is not increased. Therefore, the second valve 65 rises to the maximum within its movable range, and the collision speed when the second core 60 collides with the fixed core 30 can be suppressed. As a result, it is possible to prevent the second core 60 from violently colliding with the fixed core 30 . Therefore, durability of the second core 60 and the fixed core 30 can be improved.

Further, the upward force applied to the second core 60 is suppressed not by controlling the energization of the coil 20, but by the magnetic detour portion 53 formed in the first core 40, as the second core 60 rises. This is done by increasing the amount of the first magnetic flux f1. Therefore, the collision speed of the second core 60 can be suppressed without performing complicated energization control for the coil 20 .

In addition, since the detouring magnetic flux (first magnetic flux f1) that suppresses the magnetic flux amount of the second magnetic flux f2 passes through the first core 40 and the second core 60, the relative position of the second core 60 with respect to the first core 40 can be used to increase the bypass magnetic flux. Therefore, the structure for increasing the detouring magnetic flux can be simplified.

[Second embodiment]
Next, a second embodiment will be described. In the following description, members that are the same as or correspond to those of the previous embodiment are denoted by the same reference numerals, and only points that differ from the given embodiment will be described. However, the solenoid valves are given different reference numerals (99a to 99h) for each embodiment. Regarding this embodiment, only the points that are different from the first embodiment will be described.

FIG. 6 is a cross-sectional view showing the solenoid valve 99b of this embodiment. The first core 40 is fixed to the upper end of the first valve 45 . A non-magnetic portion 52 formed of an air gap is provided on the outer peripheral side of the upper and lower intermediate portions of the first core 40 . A portion of the first core 40 above the non-magnetic portion 52 constitutes a magnetic bypass portion 53 . Further, a portion of the first core 40 inward of the non-magnetic portion 52 constitutes a magnetic diaphragm portion 51 . When both the first valve 45 and the second valve 65 are lowered and closed, the inner peripheral surface of the second core 60 slides only on the portion of the first core 40 below the non-magnetic portion 52 . contact, and does not make sliding contact with the magnetic detour portion 53 above the non-magnetic portion 52 .

FIG. 7 shows when the first valve 45 is opened. When opening the first valve 45, the coil 20 is first energized with a predetermined amount of current. The energization generates a first magnetic flux f1 as shown in FIG. 7(a). The first magnetic flux f1 is applied to the fixed core 30, the upper part of the housing 10, the coil holding member 25, the lower part of the housing 10, the second core 60, the lower part of the non-magnetic part 52 of the first core 40, the side (the magnetic diaphragm part 51 ), an annular magnetic flux that flows upward, through the space between the first core 40 and the fixed core 30 , and back to the fixed core 30 . The first magnetic flux f1 attracts the first core 40 to the fixed core 30, and as shown in FIG. It abuts on the core 30 .

FIG. 8 shows the opening of the second valve 65 thereafter. When opening the second valve 65, the current supplied to the coil 20 is increased. Due to the increase in the current, the first magnetic flux f1 increases, and magnetic saturation occurs in the magnetic throttle portion 51 of the first core 40 . Thereby, as shown in FIG. 8A, a second magnetic flux f2 is generated. The second magnetic flux f2 pulls the second core 60 toward the fixed core 30, thereby raising the second core 60 and the second valve 65 as shown in FIG. 8(b). As the second core 60 rises, the gap (space) between the second core 60 and the fixed core 30 becomes smaller, thereby increasing the upward attracting force on the second core 60 .

FIG. 9 shows a mechanism for suppressing the rising speed of the second valve 65 after that. As shown in FIG. 9( a ), the second core 60 and the second valve 65 are lifted so that the inner peripheral surface of the second core 60 touches the outer peripheral surface of the magnetic bypass section 53 above the first core 40 . The sliding contact generates a third magnetic flux f3. The third magnetic flux f3 passes through the fixed core 30, the upper part of the housing 10, the coil holding member 25, the lower part of the housing 10, the second core 60, the magnetic detour part 53 in the upper part of the first core 40, and then again the fixed core 30 is an annular magnetic flux. The third magnetic flux f3 is separated from the first magnetic flux f1 by interposing the non-magnetic portion 52 in the predetermined section. The third magnetic flux f3 increases as the contact area between the inner peripheral surface of the second core 60 and the outer peripheral surface of the magnetic detour portion 53 increases as the second valve 65 rises. Due to the generation and increase of the third magnetic flux f3, the magnetic flux amount of the second magnetic flux f2 is suppressed, and the ascending speed of the second core 60 and the second valve 65 is suppressed accordingly. The second core 60 comes into contact with the fixed core 30 as shown in FIG. 9(b) while the rising speed is suppressed.

FIG. 10(a) is a sectional view showing the solenoid valve 99b of this embodiment. On the other hand, FIG. 10(b) is a sectional view showing a solenoid valve 99r of a comparative example. The solenoid valve 99r of this comparative example differs from the solenoid valve 99b of the present embodiment in the following points. The non-magnetic portion 52 is not provided in the first core 40, and therefore the magnetic detour portion 53 is not formed. Therefore, in this comparative example, even if the second core 60 rises, the third magnetic flux f3 is not generated. A cylindrical stopper 38 made of a non-magnetic material is provided above the first core 40 at the lower end of the fixed core 30 . The outer diameter of the stopper 38 is smaller than the outer diameter of the first core 40 . A portion of the stationary core 30 located outside the stopper 38 constitutes a magnetic throttle portion 51 .

FIG. 11 is a graph showing temporal changes in rising force applied to the second core 60 by the magnetic flux formed by the coil 20. As shown in FIG. A solid line indicates this embodiment, and a dashed line indicates a comparative example. Point 7b in FIG. 11 indicates the point just before the current in coil 20 is increased, as shown in FIG. 7(b).

A point 8a in FIG. 11 indicates the point in time when the current in the coil 20 starts to increase to generate the second magnetic flux f2, as shown in FIG. 8(a). Point 8b in FIG. 11 raises the second core 60 by the second magnetic flux f2 as shown in FIG. indicates the point in time.

A point 8c in FIG. 11 indicates the point in time when the inner peripheral surface of the second core 60 begins to come into sliding contact with the outer peripheral surface of the magnetic detour portion 53 and the third magnetic flux f3 begins to be generated. A point 9a in FIG. 11 indicates a time point when the second core 60 further rises and the third magnetic flux f3 increases as shown in FIG. 9(a). Point 9b in FIG. 11 indicates the point in time after the second core 60 has further risen and comes into contact with the fixed core 30 as shown in FIG. 9(b). Point 9c indicates the point in time when the current in the coil begins to decrease.

From FIG. 11, it can be seen that in this embodiment (solid line), the rising force is suppressed from the point 8c where the third magnetic flux f3 begins to be generated, compared to the comparative example (broken line) where the third magnetic flux f3 is not generated. I understand.

According to this embodiment, the following effects can be obtained. Since the detouring magnetic flux is the third magnetic flux f3 separated from the first magnetic flux f1, the detouring magnetic flux (third magnetic flux f3) can be provided separately from the first magnetic flux f1. Therefore, the degree of freedom in designing the solenoid valve 99b is greater than in the case where the first magnetic flux f1 is used as the detouring magnetic flux as in the first embodiment, or in the case where the detouring magnetic flux is generated along the first magnetic flux f1. Go up.

In addition, since the first core 40 is provided with the magnetic constriction portion 51 that generates the second magnetic flux f2 and the magnetic detour portion 53 that generates the third magnetic flux f3, the first core 40 alone can generate the second magnetic flux f2. and a third magnetic flux f3. Therefore, the structure other than the first core 40 can be simplified. Further, since the non-magnetic portion 52 is an air gap, the non-magnetic portion 52 can be easily formed simply by providing the hollowed portion in the first core 40 .

[Third Embodiment]
FIG. 12 is a cross-sectional view showing the electromagnetic valve 99c of the third embodiment. Regarding this embodiment, only the points that are different from the second embodiment will be described.

The non-magnetic portion 52 is made of a non-magnetic material instead of an air gap. According to the present embodiment, since the non-magnetic portion 52 is a non-magnetic material, it becomes easier to secure the strength of the first core 40 compared to the case where the non-magnetic portion 52 is an air gap as in the second embodiment.

[Fourth Embodiment]
FIG. 13 is a cross-sectional view showing a solenoid valve 99d of the fourth embodiment. Regarding this embodiment, only the points that are different from the second embodiment will be described.

The non-magnetic portion 52 (air gap) is provided below that of the second embodiment. Therefore, the portion of the first core 40 below the non-magnetic portion 52 is narrower than in the second embodiment, and this portion constitutes the magnetic throttle portion 51 . On the other hand, the non-magnetic portion 52 is shorter in the horizontal direction than in the second embodiment. Therefore, the portion of the first core 40 inward of the non-magnetic portion 52 is wider than in the second embodiment, and this portion does not constitute the magnetic throttle portion 51 . Approximately the same effects as those of the second embodiment can be obtained in this embodiment as well.

[Fifth embodiment]
FIG. 14 is a sectional view showing the solenoid valve 99e of the fifth embodiment. Regarding this embodiment, only the points different from the fourth embodiment will be described. The non-magnetic portion 52 is formed of a non-magnetic material instead of an air gap. According to the present embodiment, since the non-magnetic portion 52 is a non-magnetic material, it becomes easier to secure the strength of the first core 40 compared to the case where the non-magnetic portion 52 is an air gap.

[Sixth Embodiment]
FIG. 15 is a cross-sectional view showing an electromagnetic valve 99f of the sixth embodiment. Regarding this embodiment, only the points that are different from the second embodiment will be described.

The non-magnetic portion 52 (air gap) is provided not on the first core 40 but on the inner peripheral side of the upper and lower intermediate portions of the second core 60 . A portion of the second core 60 above the non-magnetic portion 52 constitutes a magnetic throttle portion 51 . A portion of the second core 60 below the non-magnetic portion 52 constitutes a magnetic detour portion 53 . When both the first valve 45 and the second valve 65 are lowered and both are closed, only the inner peripheral surface of the magnetic throttle portion 51 is in sliding contact with the outer peripheral surface of the first core 40, and the inner peripheral surface of the magnetic bypass portion 53 is in sliding contact with the outer peripheral surface of the first core 40. The peripheral surface does not come into sliding contact with the outer peripheral surface of the first core 40 .

As shown in FIG. 15(b), the first magnetic flux f1 flows through the fixed core 30, the upper portion of the housing 10, the coil holding member 25, the lower portion of the housing 10, the outer side and upper side of the non-magnetic portion 52 of the second core 60, It is an annular magnetic flux that passes through the first core 40 and flows back to the fixed core 30 . The second magnetic flux f2 is distributed between the fixed core 30 , the upper portion of the housing 10 , the coil holding member 25 , the lower portion of the housing 10 , the outer side of the non-magnetic portion 52 of the second core 60 , and the space between the second core 60 and the fixed core 30 . It is an annular magnetic flux that passes through the space and flows to the fixed core 30 again.

The third magnetic flux f3 passes through the fixed core 30, the upper part of the housing 10, the coil holding member 25, the lower part of the housing 10, the magnetic bypass part 53 under the second core 60, the first core 40, and then the fixed core 30 again. is an annular magnetic flux flowing through This third magnetic flux f3 is formed when the second core 60 rises and the inner peripheral surface of the magnetic detour portion 53 below the second core 60 comes into sliding contact with the outer peripheral surface of the first core 40 .

According to this embodiment, the following effects can be obtained. Since the second core 60 is provided with the magnetic constriction portion 51 that generates the second magnetic flux f2 and the magnetic detour portion 53 that generates the third magnetic flux f3, only the structure of the second core 60 can provide the second magnetic flux f2 and the third magnetic flux f2. 3 magnetic fluxes f3 can be generated. Therefore, the structure other than the second core 60 can be simplified.

[Seventh Embodiment]
FIG. 16 is a cross-sectional view showing an electromagnetic valve 99g of the seventh embodiment. Regarding this embodiment, only the points different from the sixth embodiment will be described. The non-magnetic portion 52 is formed of a non-magnetic material instead of an air gap. According to the present embodiment, since the non-magnetic portion 52 is a non-magnetic material, it becomes easier to ensure the strength of the second core 60 compared to the case of an air gap.

[Eighth embodiment]
FIG. 17 is a cross-sectional view showing an electromagnetic valve 99h of the eighth embodiment. Regarding this embodiment, only the points that are different from the first embodiment will be described.

The solenoid valve 99h of this embodiment does not include the first core 40 and the first valve 45. As shown in FIG. In this embodiment, the second core 60 is simply called "core 60", and the second valve 65 is simply called "valve body 65". Further, only one channel 16 is provided on the bottom surface of the housing 10 instead of the first channel 14 and the second channel 16 . Further, the valve body 65 has a cylindrical shape with a bottom, and is configured to block the flow path 16 with its bottom portion when lowered. At the center of the bottom of the fixed core 30, a downwardly protruding magnetic detour 53 made of a magnetic material is attached. When the valve body 65 is lowered to close the valve, the inner peripheral surface of the core 60 does not come into sliding contact with the outer peripheral surface of the magnetic detour portion 53 .

When the coil 20 is energized, the second magnetic flux f2 is generated as shown in FIG. 17(a), and the core 60 and the valve body 65 rise as shown in FIG. 17(b). Then, the inner peripheral surface of the core 60 is brought into sliding contact with the outer peripheral surface of the magnetic detour portion 53, thereby generating the third magnetic flux f3. The third magnetic flux f3 is an annular magnetic flux that flows through the fixed core 30 , the upper portion of the housing 10 , the coil holding member 25 , the lower portion of the housing 10 , the core 60 , and the magnetic detour portion 53 to the fixed core 30 again.

According to the present embodiment, the core 60 and the valve body 65 in the electromagnetic valve 99h can be prevented from violently colliding with the fixed core 30 .

[Other embodiments]
Each embodiment can be implemented with the following modifications. For example, the magnetic fluxes f1, f2, f3 may be generated in the opposite direction, ie opposite to the direction indicated by the arrows in the figure. Alternatively, for example, the second core 60 or the second valve 65 may contact a stopper different from the fixed core 30 instead of limiting the upward range of the second core 60 by contacting the second core 60 with the fixed core 30 . , the upward range of the second core 60 may be restricted. Further, for example, a clearance may be provided between the outer peripheral surface of the first core 40 and the inner peripheral surface of the second core 60 . Further, for example, a coil for driving the first valve 45 and a coil for driving the second valve 65 may be provided separately. Further, for example, the first valve 45 may be made of a magnetic material and integrated with the first core 40 . Further, for example, the second valve 65 may be made of a magnetic material and integrated with the second core 60 . Further, for example, in the sixth or seventh embodiment, instead of forming the magnetic diaphragm portion 51 above the non-magnetic portion 52 in the second core 60, the portion above the non-magnetic portion 52 is widened and non-magnetic. The width of the outer portion may be narrower than that of the portion 52, and the magnetic aperture portion 51 may be used as the outer portion.

DESCRIPTION OF SYMBOLS 14... 1st flow path, 16... 2nd flow path, 20... Coil, 30... Fixed core, 40... First core, 45... First valve, 51... Magnetic restriction part, 52... Non-magnetic part, 53... Magnetic Detour part 60...Second core 65...Second valve 99a to 99h...Solenoid valve f1...First magnetic flux f2...Second magnetic flux f3...Third magnetic flux.

Claims (7)

The valve is provided movably in the opening/closing direction within a predetermined range, and by moving in the opening direction, which is one of the opening/closing directions, the fluid flow path (16) is opened, and the fluid passage (16) is closed in the opposite direction to the opening direction. a movable valve (65) that closes the flow path by moving in a direction;
a movable core (60) which is a magnetic body provided to move in the opening/closing direction together with the movable valve;
a fixed core (30), which is a magnetic body fixed on the opening direction side of the movable core;
a coil (20) that, when energized, generates a driving magnetic flux (f2) that attracts the movable core to the fixed core, thereby moving the movable core and the movable valve in the opening direction;
In solenoid valves (99a to 99h) having
A magnetic detour part (53) made of a magnetic material for increasing the amount of detouring magnetic flux (f1, f3) different from the driving magnetic flux as the movable core moves in the opening direction. ,
An electromagnetic valve that suppresses the magnetic flux amount of the driving magnetic flux by increasing the magnetic flux amount of the detouring magnetic flux by using the magnetic detour section, compared to a case where the magnetic bypass section does not increase the magnetic flux amount. It is provided movably in the opening/closing direction, and by moving in the opening direction, it opens a first flow path (14), which is a flow path separate from the fluid flow path, and moves in the closing direction. a first valve (45) that closes the first flow path by
a second valve (65) as the movable valve that opens and closes the second flow path (16) as the flow path;
a first core (40) which is a magnetic body provided to move in the opening/closing direction together with the first valve;
a second core (60) as the movable core,
The second core is arranged on the side of the first core with the direction orthogonal to the opening and closing direction as the side,
When energized, the coil generates a first magnetic flux (f1) that attracts the first core to the fixed core, thereby moving the first core and the first valve in the opening direction. Magnetic saturation occurs at a predetermined portion of the magnetic path of the first magnetic flux to generate a second magnetic flux (f2) as the driving magnetic flux, and the second magnetic flux causes the second core and the second valve to move. 2. The solenoid valve according to claim 1, which moves in said opening direction. 3. The electromagnetic valve according to claim 2, wherein said detouring magnetic flux is magnetic flux that flows through said first core and said second core. 4. The electromagnetic valve according to claim 2, wherein said detouring magnetic flux is a third magnetic flux (f3) separated from said first magnetic flux in a predetermined section. The first core or the second core is provided with an air gap or a non-magnetic portion (52) made of a non-magnetic material, and the first magnetic flux is formed on one of the two sides sandwiching the non-magnetic portion. 5. The solenoid valve according to claim 4, wherein the third magnetic flux is formed on the side. The non-magnetic portion is provided at an intermediate portion of the first core in the opening/closing direction,
A magnetic narrowed portion (51) for generating the magnetic saturation is provided on the closing direction side or the lateral side of the non-magnetic portion in the first core, and the first magnetic flux is applied to the second core. and a magnetic flux flowing through the fixed core and the closing direction side and the lateral side of the non-magnetic portion of the first core,
The magnetic detour portion is formed on the opening direction side of the non-magnetic portion of the first core, and the second core moves in the opening direction so that the second core moves toward the magnetic detour portion. 6. The electromagnetic valve according to claim 5, wherein said third magnetic flux is formed when coming laterally, said third magnetic flux being magnetic flux flowing through said second core, said magnetic detour and said fixed core. The non-magnetic portion is provided at an intermediate portion of the second core in the opening/closing direction,
A magnetic narrowed portion (51) for generating the magnetic saturation is provided on the lateral side or the opening direction side of the non-magnetic portion of the second core, and the first magnetic flux is applied to the second core. a magnetic flux flowing through the lateral side and the opening direction side of the non-magnetic portion, the first core, and the fixed core,
The magnetic detour portion is formed on the closing direction side of the non-magnetic portion of the second core, and when the second core moves in the opening direction, the magnetic detour portion moves toward the first core. 6. The solenoid valve according to claim 5, wherein said third magnetic flux is formed when coming laterally, and said third magnetic flux is magnetic flux flowing through said magnetic detour portion, said first core, and said fixed core.

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