JP2020063789A - Electromagnetic valve - Google Patents

Abstract

To suppress a collision speed when a movable core or the like collides with a fixed core or the like due to the maximum displacement of the movable core in a closing direction.SOLUTION: An electromagnetic valve 99b has a movable valve 65, a movable core 60, a fixed core 30 and a coil 20. The movable valve 65 valve-opens a flow passage 16 by moving in an opening direction, and valve-closes the flow passage 16 by moving in a closing direction. The movable core 60 is a magnetic body which moves in an opening/closing direction together with the movable valve 65. The fixed core 30 is a magnetic body fixed to the opening direction side rather than the movable core 60. The coil 20 moves the movable core 60 and the movable valve 65 in the opening direction by generating drive magnetic flux f2 for drawing the movable core 60 to the fixed core 30 when carried with electricity. A magnetism bypass part 53 is formed at the magnetic body. The magnetism bypass part 53 suppresses a magnetic flux amount of the drive magnetic flux f2 by increasing a magnetic flux amount of bypass magnetic flux f3 which is different from the drive magnetic flux f2 accompanied by the movement of the movable core 60 and the movable valve 65 in the opening direction.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a solenoid valve that opens a valve by generating magnetic flux by controlling energization.

  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 move up and down within a predetermined range. When the movable valve moves up, the flow path opens, and when it moves down, the flow path closes. The movable core is a magnetic body provided so as to move up and down together with the movable valve. The fixed core is a magnetic body fixed above the movable core. The coil, when energized, generates a magnetic flux to draw the movable core toward the fixed core and raise the movable core and the movable valve. Then, 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 drawn closer to the fixed core and comes closer to the fixed core. The pulling power increases. Therefore, the movable valve rises to the maximum within the above-mentioned predetermined range, and the collision speed when the movable core or the movable valve collides with the fixed core or the stopper increases. On the other hand, in order to suppress the collision speed by controlling the power supply to 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.

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

  The solenoid valve of the present invention has a movable valve, a movable core, a fixed core, and a coil. The movable valve is provided so as to be movable in the opening / closing direction within a predetermined range, and opens the fluid flow path by moving in the opening direction, which is one of the opening / closing directions, and in the 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 fixed to the opening direction side of the movable core. The coil, when energized, 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 includes a magnetic bypass portion. The magnetic bypass portion is formed of a magnetic material, and increases the magnetic flux amount of the bypass magnetic flux different from the drive magnetic flux with the movement of the movable core in the opening direction. The electromagnetic valve suppresses the magnetic flux amount of the drive magnetic flux by increasing the magnetic flux amount of the bypass magnetic flux by the magnetic bypass portion, as compared with the case where the magnetic flux is not increased.

  According to the present invention, the magnetic flux amount of the bypass magnetic flux is increased by increasing the magnetic flux amount of the bypass magnetic flux in accordance with the movement of the movable core in the opening direction, thereby suppressing the force that pulls the movable core in the opening direction. Therefore, it is possible to suppress the collision speed when the movable valve is displaced to the maximum in the opening direction within the predetermined range and the movable core, the movable valve, or the like collides with the fixed core, the stopper, or the like. Therefore, the collision can be softened, and the durability of the movable core or the movable valve, the fixed core, the stopper, or the like can be improved.

  Further, the suppression of the force pulling the movable core to the fixed core is not performed by controlling the energization of the coil, but by the magnetic bypass portion formed of a magnetic material, the bypass magnetic flux is generated as the movable core moves in the opening direction. This is done by increasing the amount of magnetic flux. Therefore, the collision speed can be suppressed without performing complicated energization control on the coil.

Sectional drawing which shows the engine of 1st Embodiment. Sectional view showing the solenoid valve of the engine Sectional drawing which shows the time of opening the 1st valve of a solenoid valve. Sectional drawing which shows the time of opening the 2nd valve of a solenoid valve. Sectional drawing which shows the mechanism which suppresses the valve opening speed of a 2nd valve. Sectional drawing which shows the solenoid valve of 2nd Embodiment. Sectional drawing which shows the time of opening the 1st valve of a solenoid valve. Sectional drawing which shows the time of opening the 2nd valve of a solenoid valve. Sectional drawing which shows the mechanism which suppresses the valve opening speed of a 2nd valve. Sectional drawing which shows the solenoid valve of this embodiment and the solenoid valve of a comparative example. Graph showing the time change of the 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 solenoid 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 may be appropriately modified and carried out without departing from the spirit of the invention.

[First Embodiment]
FIG. 1 is a cross-sectional view showing an electromagnetic valve 99a of the present embodiment and an internal combustion engine 90 equipped with the electromagnetic valve 99a. The internal combustion engine 90 includes a cylinder 93 and a piston 94 that is reciprocally installed inside the cylinder 93. An intake passage 91 and an exhaust passage 96 communicate with 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 99a is provided for the intake passage 91. The electromagnetic valve 99a 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 a gas fuel or a 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 in the lengthwise direction of the solenoid valve 99a will be referred to as "down" and the other side will be referred to as "upper" in accordance with the drawings. However, the solenoid valve 99a may be installed in any direction such that the length direction thereof is installed obliquely with respect to the vertical direction as shown in FIG. 1 or installed horizontally. You can The lower side in the present embodiment corresponds to the “closing direction” in the present invention, and the upper side in the present embodiment corresponds to the “opening direction” in the present invention.

  The electromagnetic valve 99a 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 tubular member, and an annular non-magnetic material portion 12 formed of a non-magnetic material is provided in the upper and lower intermediate portions. Parts of the housing 10 other than the non-magnetic part 12 are made of a magnetic material. A bottom member 13 is provided inside the lower end of the housing 10. The bottom surface member 13 is provided with a through-hole-shaped first flow path 14 and a second flow path 16. Below, the portion above the non-magnetic material portion 12 of the housing 10 is referred to as the “upper portion of the housing 10,” and the portion of the housing 10 below the non-magnetic material portion 12 is referred to as the “lower portion of the housing 10.

  The coil 20 is installed around the upper portion of the housing 10. A coil holding member 25 made of a magnetic material for holding the coil 20 in the housing 10 is provided around the coil 20. A fixed core 30 made of a magnetic material is installed inside the upper portion of the housing 10. The fixed core 30 is a tubular member, and the tubular hole 35 thereof constitutes a part of the fuel passage. A cylindrical fixing member 33 is attached to the cylindrical 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 also serves as a stopper that restricts the rising of the first core 40 and the second core 60 by contacting the upper end surface of the first core 40 and the upper end surface of 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 that constitutes a part of the fuel passage is provided inside the first valve 45. Further, 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 an annular magnetic body, and is fixed to the upper portion of the first valve 45 by being externally fitted. Therefore, the first core 40 and the first valve 45 move up and down together. The lower part of the first core 40 is thinner than the upper part, and constitutes a magnetic diaphragm 51 for generating magnetic saturation. The upper part of the first core 40 widens to the left and right as it goes upward, forming a magnetic detour 53.

  The fuel pressure applied to the first core 40 and the first valve 45 from the upper side 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 presses the first core 40 and the first valve 45 upward. Further, the predetermined magnetic flux (f1, f3) generated by the coil 20 also draws the first core 40 and the first valve 45 upward. Due to the change in these force balances, the first core 40 and the first valve 45 move up and down.

  The first valve 45 opens to open the first flow path 14, and lowers to close the first flow path 14. When the first valve 45 opens, the fuel supplied from the fuel supply pipe 98 causes the space between the cylindrical hole 35, the first hole 46, and 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 is injected into the intake passage 91.

  The second valve 65 is a tubular non-magnetic material, 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 a part of the fuel passage. A second seal 68 for closing the second flow path 16 is provided at the lower end of the second valve 65.

  The second core 60 is an annular magnetic body and is fitted onto the first core 40 so as to be able to move up and down. Therefore, the second core 60 is arranged beside 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 upper part 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 the upper side presses 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 the lower side presses the second core 60 and the second valve 65 upward. Further, the predetermined magnetic flux (f2) generated by the coil 20 also draws the second core 60 and the second valve 65 upward. Due to these changes in the force balance, the second core 60 and the second valve 65 move up and down.

  The second valve 65 opens to open the second flow path 16, and lowers to close the second flow path 16. When the second valve 65 is opened, the fuel supplied from the fuel supply pipe 98 causes the space between the cylindrical hole 35, the first hole 46, the outer peripheral surface of the first valve 45 and the inner peripheral surface of the second valve 65. , And is injected into the intake passage 91 through the second flow path 16.

  In a state where 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 higher than the upper end surface of the second core 60 and is fixed. Approaching the core 30. As a result, the first core 40 and the first valve 45 are raised and opened earlier than the second core 60 and the second valve 65. Further, in a state where both the first valve 45 and the second valve 65 are lowered and both are closed, the inner peripheral surface of the second core 60 is in sliding contact with the outer peripheral surface of the magnetic throttle portion 51, and the magnetic detour is performed. There is no sliding contact with the outer peripheral surface of the portion 53.

  FIG. 3 shows a case where the first valve 45 is opened. When opening the first valve 45, first, a predetermined amount of current is passed through the coil 20. The current causes a first magnetic flux f1 to be generated as shown in FIG. The first magnetic flux f1 forms a space 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 second core 60, the first core 40, and the first core 40 and the fixed core 30. It is an annular magnetic flux that flows through the fixed core 30 again. A force that pulls the first core 40 toward the fixed core 30 is generated by the first magnetic flux f1. Due to the force, the force pressing the first core 40 and the first valve 45 upward exceeds the force pressing downward. As a result, as shown in FIG. 3B, the first core 40 and the first valve 45 rise, and the first core 40 comes into contact with the fixed core 30.

  FIG. 4 shows a case where the second valve 65 is subsequently opened. When the second valve 65 is opened, 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 the magnetic diaphragm 51 of the first core 40 magnetically saturates. As a result, the second magnetic flux f2 is generated as shown in FIG. The second magnetic flux f2 is fixed again 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, and the space between the second core 60 and the fixed core 30. It is an annular magnetic flux flowing in 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 the force, the force of pressing the second core 60 and the second valve 65 upward exceeds the force of pressing downward. As a result, as shown in FIG. 4B, the second core 60 and the second valve 65 rise. With the increase, the gap (space) between the second core 60 and the fixed core 30 becomes smaller, and the upward pulling force with respect to the second core 60 increases.

  FIG. 5 shows a mechanism for suppressing the rising speed of the second valve 65 after that. As shown in FIG. 5A, when the second core 60 and the second valve 65 move up and the inner peripheral surface of the second core 60 slides into contact with the outer peripheral surface of the magnetic bypass portion 53 of the first core 40. As a part of the first magnetic flux f1 starts to flow directly to the magnetic bypass portion 53 without passing through the magnetic diaphragm 51, the magnetic flux amount of the first magnetic flux f1 starts to increase. Since the magnetic detour section 53 becomes wider in the left-right direction as it goes upward, the magnetic flux flowing through the magnetic detour section 53 increases as the second core 60 rises, and the amount of magnetic flux of the first magnetic flux f1 increases. . As a result, the magnetic flux amount of the second magnetic flux f2 is suppressed, and the rising speeds of the second core 60 and the second valve 65 are suppressed accordingly. In that state, as shown in FIG. 5B, the second core 60 contacts the fixed core 30.

  Next, by lowering the current passed through 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 are 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, the fuel 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 can be obtained. Since there is the first valve 45 and the second valve 65, the fuel injection amount can be controlled in two stages. Further, in the present embodiment, by energizing the coil 20, the first magnetic flux f1 is generated to raise the first core 40 and the first valve 45. After that, the magnetic saturation occurs in the magnetic diaphragm 51, so that the second magnetic flux f2 is generated. The second magnetic flux f2 raises the second core 60 and the second valve 65. Therefore, the first valve 45 and the second valve 65 can be sequentially opened with only one coil 20. Therefore, it is not necessary to separately provide a coil that drives the first valve 45 and a coil that drives the second valve 65, and the configuration of the electromagnetic valve 99a can be simplified.

  Further, when the second valve 65 is opened, the magnetic flux amount of the first magnetic flux f1 is increased with the rise of the second core 60. As a result, the magnetic flux amount of the second magnetic flux f2 is suppressed as compared with the case where it is not increased, and the force of pulling the second core 60 toward the fixed core 30 is suppressed. Therefore, the second valve 65 is maximally raised 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, the durability of the second core 60 and the fixed core 30 can be improved.

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

  Further, since the bypass magnetic flux (first magnetic flux f1) that suppresses the amount of magnetic flux 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. It is possible to increase the detour magnetic flux by utilizing the change of. Therefore, the structure for increasing the bypass magnetic flux can be simply put together.

[Second Embodiment]
Next, a second embodiment will be described. In the following, the same or corresponding members as those of the previous embodiment will be denoted by the same reference numerals, and only the points different from the predetermined embodiment will be described. However, the solenoid valves are given different reference numerals (99a to 99h) for each embodiment. Regarding the present embodiment, only the points 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 detour portion 53. Further, the inner portion of the first core 40 with respect to 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 both are closed, the inner peripheral surface of the second core 60 is slid only on a portion of the first core 40 below the non-magnetic portion 52. However, the magnetic detour portion 53 above the non-magnetic portion 52 does not slide.

  FIG. 7 shows the opening of the first valve 45. When opening the first valve 45, first, a predetermined amount of current is passed through the coil 20. 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 portion of the housing 10, the coil holding member 25, the lower portion of the housing 10, the second core 60, the lower side of the non-magnetic portion 52 of the first core 40, and the lateral direction (the magnetic throttle portion 51). ) Is an annular magnetic flux that flows through the space between the first core 40 and the fixed core 30 upward and again to the fixed core 30. The first core 40 is attracted to the fixed core 30 by the first magnetic flux f1, so that the first core 40 and the first valve 45 rise and the first core 40 is fixed, as shown in FIG. 7B. Contact the core 30.

  FIG. 8 shows a case where the second valve 65 is subsequently opened. When the second valve 65 is opened, the current flowing through the coil 20 is increased. Due to the increase in the current, the first magnetic flux f1 increases and the magnetic diaphragm 51 of the first core 40 magnetically saturates. As a result, the second magnetic flux f2 is generated as shown in FIG. As the second core 60 is attracted to the fixed core 30 by the second magnetic flux f2, the second core 60 and the second valve 65 rise as shown in FIG. 8B. With the rise, the gap (space) between the second core 60 and the fixed core 30 becomes smaller, and the upward pulling force with respect to the second core 60 increases.

  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 rise, and the inner peripheral surface of the second core 60 becomes the outer peripheral surface of the magnetic bypass portion 53 at the upper part of the first core 40. Upon sliding contact, a third magnetic flux f3 is generated. The third magnetic flux f3 passes 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 magnetic detour portion 53 on the upper portions of the second core 60 and the first core 40, and again the fixed core. It is an annular magnetic flux flowing in 30. The third magnetic flux f3 is separated from the first magnetic flux f1 by sandwiching the non-magnetic portion 52 in a 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 bypass 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 rising speeds of the second core 60 and the second valve 65 are suppressed accordingly. With the rising speed suppressed, as shown in FIG. 9B, the second core 60 contacts the fixed core 30.

  FIG. 10A is a cross-sectional view showing the solenoid valve 99b of this embodiment. On the other hand, FIG. 10B is a sectional view showing a solenoid valve 99r of a comparative example. The solenoid valve 99r of this comparative example is different from the solenoid valve 99b of the present embodiment in the following points. The non-magnetic portion 52 is not provided on the first core 40, and therefore the magnetic detour portion 53 is also not formed. Therefore, in this comparative example, the third magnetic flux f3 is not generated even if the second core 60 moves up. 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. The portion of the fixed core 30 outside the stopper 38 constitutes the magnetic diaphragm 51.

  FIG. 11 is a graph showing the time change of the ascending force applied to the second core 60 by the magnetic flux formed by the coil 20. The solid line shows this embodiment, and the broken line shows a comparative example. A point 7b in FIG. 11 indicates a time point immediately before the current in the coil 20 is increased, as shown in FIG. 7 (b).

  A point 8a in FIG. 11 indicates a time point at which the current in the coil 20 is started to increase and the second magnetic flux f2 is generated, as shown in FIG. 8 (a). As shown in FIG. 8B, the point 8b in FIG. 11 raises the second core 60 by the second magnetic flux f2, and as a result, the force by which the fixed core 30 pulls the second core 60 upward increases. It shows the time.

  A point 8c in FIG. 11 indicates a time point at which the inner peripheral surface of the second core 60 starts sliding contact with the outer peripheral surface of the magnetic bypass portion 53 and the third magnetic flux f3 starts 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. 9A. A point 9b in FIG. 11 indicates a time point after the second core 60 further rises and the second core 60 contacts the fixed core 30 as shown in FIG. 9B. Point 9c indicates the time when the reduction of the coil current is started.

  From FIG. 11, in the present embodiment (solid line), the rising force is suppressed from the point 8c at which the third magnetic flux f3 starts to be generated, compared to the comparative example (broken line) in which the third magnetic flux f3 is not generated. I understand.

  According to this embodiment, the following effects can be obtained. Since the bypass magnetic flux is the third magnetic flux f3 separated from the first magnetic flux f1, the bypass 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 higher than that in the case where the first magnetic flux f1 is used as the bypass magnetic flux as in the first embodiment, or the case where the bypass magnetic flux is generated along the first magnetic flux f1. Go up.

  Moreover, since the first core 40 is provided with the magnetic diaphragm 51 that generates the second magnetic flux f2 and the magnetic detour 53 that generates the third magnetic flux f3, only the structure of the first core 40 provides the second magnetic flux f2. And the 3rd magnetic flux f3 can be generated. 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 first core 40 with a thinned portion.

[Third Embodiment]
FIG. 12 is a sectional view showing the solenoid valve 99c of the third embodiment. Regarding the present embodiment, only the points different from the second embodiment will be described.

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

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

  The non-magnetic part 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 that of the second embodiment, and this portion constitutes the magnetic diaphragm 51. On the other hand, the length of the non-magnetic portion 52 in the left-right direction is shorter than that of the second embodiment. Therefore, the inner portion of the first core 40 with respect to the non-magnetic portion 52 is wider than that of the second embodiment, and this portion does not form the magnetic diaphragm 51. Also according to the present embodiment, it is possible to obtain substantially the same effect as that of the second embodiment.

[Fifth Embodiment]
FIG. 14 is a sectional view showing the solenoid valve 99e of the fifth embodiment. Regarding the present embodiment, only the points different from the fourth embodiment will be described. The non-magnetic portion 52 is formed of a non-magnetic material, not an air gap. According to the present embodiment, since the non-magnetic portion 52 is a non-magnetic material, it is easier to secure the strength of the first core 40 as compared with the case where it is an air gap.

[Sixth Embodiment]
FIG. 15 is a sectional view showing the solenoid valve 99f of the sixth embodiment. Regarding the present embodiment, only the points 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 the magnetic diaphragm 51. A portion of the second core 60 below the non-magnetic portion 52 constitutes a magnetic detour portion 53. In a state where 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 peripheral surface does not slide on the outer peripheral surface of the first core 40.

  As shown in FIG. 15B, the first magnetic flux f1 is generated by 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 the 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 again to the fixed core 30. The second magnetic flux f2 is generated 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 outside of the non-magnetic portion 52 of the second core 60, and the second core 60 and the fixed core 30. It is an annular magnetic flux that flows through the space and flows again to the fixed core 30.

  The third magnetic flux f3 passes 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 magnetic bypass portion 53 at the lower portion of the second core 60, the first core 40, and the fixed core 30 again. It is an annular magnetic flux that flows through. The third magnetic flux f3 is formed when the second core 60 rises and the inner peripheral surface of the magnetic bypass portion 53 located therebelow slides on 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 diaphragm 51 that generates the second magnetic flux f2 and the magnetic detour 53 that generates the third magnetic flux f3, the second magnetic flux f2 and the second magnetic flux f2 Three magnetic fluxes f3 can be generated. Therefore, the structure other than the second core 60 can be simplified.

[Seventh Embodiment]
FIG. 16 is a sectional view showing a solenoid valve 99g of the seventh embodiment. Regarding the present embodiment, only the points different from the sixth embodiment will be described. The non-magnetic portion 52 is formed of a non-magnetic material, not an air gap. According to the present embodiment, since the non-magnetic portion 52 is a non-magnetic material, it is easier to secure the strength of the second core 60 than when it is an air gap.

[Eighth Embodiment]
FIG. 17 is a sectional view showing a solenoid valve 99h of the eighth embodiment. Regarding the present embodiment, only the points 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. In the present embodiment, the second core 60 is simply referred to as “core 60”, and the second valve 65 is simply referred to as “valve body 65”. Further, only one flow passage 16 is provided on the bottom surface of the housing 10 instead of the first flow passage 14 and the second flow passage 16. Further, the valve body 65 has a bottomed tubular shape, and is configured to close the flow path 16 with the bottom surface portion when descending. At the center of the bottom of the fixed core 30, a magnetic detour 53 of a magnetic material protruding downward is attached. When the valve body 65 descends and closes the valve, the inner peripheral surface of the core 60 does not slide on the outer peripheral surface of the magnetic bypass 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 are raised as shown in FIG. 17 (b). Then, the third magnetic flux f3 is generated by the inner peripheral surface of the core 60 slidingly contacting the outer peripheral surface of the magnetic bypass portion 53. 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 bypass portion 53 to the fixed core 30 again.

  According to the present embodiment, in the solenoid valve 99h having only one core 60 and valve body 65, it is possible to prevent the core 60 from colliding violently with the fixed core 30.

[Other Embodiments]
Each embodiment can be modified and implemented as follows. For example, the magnetic fluxes f1, f2, and f3 may be generated in the direction opposite to the above, that is, in the direction opposite to the direction indicated by the arrow in the figure. Further, for example, the second core 60 hits the fixed core 30 so that the rising range of the second core 60 is limited, but the second core 60 or the second valve 65 hits a stopper different from the fixed core 30. Therefore, the rising range of the second core 60 may be limited. Further, for example, a clearance may be formed between the outer peripheral surface of the first core 40 and the inner peripheral surface of the second core 60. Further, for example, the coil that drives the first valve 45 and the coil that drives the second valve 65 may be separately provided. 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 the upper portion of the second core 60 above the non-magnetic portion 52 being the magnetic diaphragm portion 51, the upper portion above the non-magnetic portion 52 is made wider and non-magnetic. The outer side portion may be narrower than the portion 52, and the outer side portion may be the magnetic diaphragm 51.

  14 ... 1st flow path, 16 ... 2nd flow path, 20 ... Coil, 30 ... Fixed core, 40 ... 1st core, 45 ... 1st valve, 51 ... Magnetic throttle part, 52 ... Nonmagnetic part, 53 ... Magnetic Detour part, 60 ... 2nd core, 65 ... 2nd valve, 99a-99h ... Solenoid valve, f1 ... 1st magnetic flux, f2 ... 2nd magnetic flux, f3 ... 3rd magnetic flux.

Claims (7)

It is provided so as to be movable in the opening / closing direction within a predetermined range, and opens in the opening direction that is one of the opening / closing directions to open the flow path (16) of the fluid and close it in the opposite direction to the opening direction. A movable valve (65) for closing the flow path by moving in the direction,
A movable core (60) which is a magnetic body and is provided so as to move together with the movable valve in the opening / closing direction;
A fixed core (30) which is a magnetic body fixed to the opening direction side of the movable core;
A coil (20) for moving the movable core and the movable valve in the opening direction by generating a driving magnetic flux (f2) that attracts the movable core to the fixed core when energized.
In a solenoid valve (99a to 99h) having
The magnetic detour section (53) is formed of a magnetic material, and increases the magnetic flux amount of the detour magnetic flux (f1, f3) different from the driving magnetic flux with the movement of the movable core in the opening direction. ,
An electromagnetic valve in which the magnetic flux amount of the bypass magnetic flux is increased by increasing the magnetic flux amount of the bypass magnetic flux by the magnetic bypass unit, compared to a case where the magnetic flux is not increased. It is movably provided in the opening / closing direction, and by moving in the opening direction, a first channel (14), which is a channel different from the channel for fluid, is opened and moved in the closing direction. A first valve (45) for closing 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 and is provided so as to move together with the first valve in the opening / closing direction;
A second core (60) as the movable core,
The second core is arranged laterally of the first core, with the direction orthogonal to the opening / closing direction being lateral.
The coil moves the first core and the first valve in the opening direction by generating a first magnetic flux (f1) that attracts the first core to the fixed core by the energization, and then the The magnetic saturation occurs at a predetermined portion of the magnetic path of the first magnetic flux to generate the second magnetic flux (f2) as the driving magnetic flux, and the second magnetic flux causes the second core and the second valve to operate. The solenoid valve according to claim 1, which moves in the opening direction.   The solenoid valve according to claim 2, wherein the bypass magnetic flux is a magnetic flux flowing through the first core and the second core.   The solenoid valve according to claim 2 or 3, wherein the bypass magnetic flux is a third magnetic flux (f3) separated from the first magnetic flux in a predetermined section.   An air gap or a non-magnetic part (52) of a non-magnetic material is provided in the first core or the second core, and the first magnetic flux is formed on one side of both sides sandwiching the non-magnetic part, and the other. The solenoid valve according to claim 4, wherein the third magnetic flux is formed on the side. The non-magnetic portion is provided in an intermediate portion of the first core in the opening / closing direction,
A magnetic diaphragm 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 generated by the second core. And a magnetic flux flowing through the fixed core and the side closer to the closing direction than the non-magnetic portion in the first core,
The magnetic bypass portion is formed on the opening direction side of the non-magnetic portion of the first core, the second core moves in the opening direction, and the second core moves to the magnetic bypass portion. The solenoid valve according to claim 5, wherein the third magnetic flux is formed when coming to a side, and the third magnetic flux is a magnetic flux that flows through the second core, the magnetic bypass portion, and the fixed core. The non-magnetic portion is provided in an intermediate portion of the second core in the opening / closing direction,
A magnetic diaphragm portion (51) for generating the magnetic saturation is provided on the side or the opening direction side of the non-magnetic portion in the second core, and the first magnetic flux is the second core. Magnetic flux flowing through the side and the opening direction side of the non-magnetic portion in, the first core, and the fixed core,
The magnetic bypass portion is formed closer to the closing direction side of the non-magnetic portion in the second core, the second core moves in the opening direction, and the magnetic bypass portion is closer to the first core. The solenoid valve according to claim 5, wherein the third magnetic flux is formed when coming to a side, and the third magnetic flux is a magnetic flux that flows through the magnetic bypass portion, the first core, and the fixed core.

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