Rubber solenoid valve

Abstract

To provide a valve rubber type solenoid valve which is excellent in durability.SOLUTION: A valve rubber type solenoid valve comprises: a body part having a valve rubber seating face into which at least one fluid flow passage opens; valve rubber arranged so as to seat on the valve rubber seating face of the body part; a movable core for holding the valve rubber; and an electromagnetic force action part for making an electromagnetic force act on the movable core and moving the valve rubber relative to the valve rubber seating face by moving the movable core relative to the valve rubber seating face of the body part. The valve rubber has an opening closing face part, a cylindrical part extending from the opening closing face part to the movable core side, and a flange part annularly extending outwardly from an end part of the cylindrical part at the movable core side. A region of the flange part at an external peripheral side is fixed to the body part. The opening closing face part is fixed to the movable core, whereas the cylindrical part is not fixed to the movable core and deformable relative to the movable core by expansion and contraction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rubber solenoid valve used to control the flow / cut-off of a fluid, such as printing ink. [Background technology]

[0002] Conventionally, rubber valve type solenoid valves have been used to control the flow / shutoff of fluids.

[0003] For example, as shown in FIG. 11, a conventional diaphragm type solenoid valve (an example of a rubber valve type solenoid valve) comprises a main body 110 having a diaphragm seating surface 112 to which flow paths 110a and 110b open, a diaphragm 123 arranged to seat on the diaphragm seating surface 112 of the main body 110, a diaphragm boss 122 that holds the diaphragm 123, a moving core (not shown in FIG. 11) that holds the diaphragm boss 122, and an electromagnetic force application unit (not shown in FIG. 11) that applies an electromagnetic force to the moving core and moves the moving core in a direction away from the diaphragm seating surface 112 of the main body 110, thereby moving the diaphragm 123 away from the diaphragm seating surface 112.

[0004] More specifically, the diaphragm boss 122 has a large-diameter surrounded main body portion 122m surrounded by the diaphragm 123, and a small-diameter portion 122e extending upward from the center of the surrounded main body portion 122m, and the diaphragm 123 has a diaphragm boss surrounding portion 123c surrounding the lower region of the surrounded main body portion 122m and the small-diameter portion 122e, a thin-walled portion 123b extending annularly outside the diaphragm boss surrounding portion 123c, and a thick-walled outer peripheral portion 123a extending annularly further outside the thin-walled portion 123b.

[0005] The surrounded main body portion 122m and the lower region of the small diameter portion 122e of the diaphragm boss 122 and the diaphragm boss surrounding portion 123c of the diaphragm 123 are adapted to be engaged (and removed) manually by an operator, utilizing the elastic deformation of the diaphragm boss surrounding portion 123c.

[0006] In the conventional diaphragm type solenoid valve shown in FIG. 11, the diaphragm 123 is elastically deformed by utilizing the thin portion 123b, but the durability of the thin portion 123b can become an issue.

[0007] The applicant has also developed a diaphragm-type solenoid valve in which the diaphragm boss does not fall off the diaphragm when the moving core rises. Specifically, the applicant has developed a technology for integrating the diaphragm with the diaphragm boss by baking it (Patent Document 1). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Publication No. 2020-076437 Summary of the Invention [Problem to be solved by the invention]

[0009] In a conventional diaphragm type solenoid valve, the deformation of the diaphragm 123 is borne by the thin-walled portion 123b that extends annularly outside the diaphragm boss surrounding portion 123c.

[0010] While considering the development of a small rubber valve type solenoid valve, the inventors of the present invention discovered that a rubber valve type solenoid valve with excellent durability could be realized by making the area responsible for the deformation of the rubber valve a cylindrical area extending in the height direction, instead of an annular area having a thin-walled portion in the height direction (see thin-walled portion 123b in Figure 11).

[0011] The present invention has been made based on the above findings, and an object of the present invention is to provide a new configuration for a rubber valve type solenoid valve that is excellent in durability. [Means for solving the problem]

[0012] The present invention is a rubber valve type solenoid valve comprising: a main body portion having a valve rubber seating surface on which at least one flow path opens; a valve rubber arranged to seat on the valve rubber seating surface of the main body portion; a movable core that holds the valve rubber; and an electromagnetic force application portion that applies an electromagnetic force to the moving core and moves the moving core relative to the valve rubber seating surface of the main body portion, thereby moving the valve rubber relative to the valve rubber seating surface, wherein the valve rubber has an opening closing surface portion, a cylindrical portion extending from the opening closing surface portion toward the moving core, and a flange portion extending annularly outward from the end of the cylindrical portion on the moving core side, and the outer peripheral region of the flange portion is fixed to the main body portion, and the opening closing surface portion is fixed to the moving core, while the cylindrical portion is not fixed to the moving core and is capable of expanding and contracting deformation relative to the moving core.

[0013] According to the present invention, the elastic deformation of the valve rubber is achieved by utilizing the expansion and contraction deformation of the tubular portion, so there is no need to provide a thin-walled portion, which fundamentally solves the durability problem caused by the existence of a thin-walled portion.

[0014] Specifically, the flange does not need to have a so-called thin portion. From the viewpoint of durability, it is preferable that the flange has a thickness of 0.8 mm or more at any position, and preferably a thickness of about 1 mm.

[0015] Furthermore, it is preferable that the movable core has a truncated cone-shaped portion at the end portion on the opening closing surface side, and that the opening closing surface portion of the valve rubber is fixed to the truncated cone-shaped portion so as to cover the truncated cone-shaped portion of the movable core.

[0016] When such a configuration is adopted, undesired detachment between the moving core and the opening closing surface of the valve rubber is prevented.

[0017] In general, the electromagnetic force application unit applies an electromagnetic force to the moving core, causing the moving core to move in one direction (for example, away from) the valve rubber seating surface of the main body, thereby moving the valve rubber in one direction (for example, away from) the valve rubber seating surface. Further, a biasing member (for example, an elastic member such as a coil spring) is provided which applies a biasing force (for example, elastic force) to the moving core when the electromagnetic force application unit is not applying an electromagnetic force to the moving core, causing the moving core to move in the other direction (for example, toward) the valve rubber seating surface of the main body, thereby moving the valve rubber in the other direction (for example, toward) the valve rubber seating surface.

[0018] In this case, it is preferable that when the electromagnetic force or the biasing force moves the movable core in a direction approaching the valve rubber seating surface of the main body, the cylindrical portion of the valve rubber becomes extended, the valve rubber seats on the valve rubber seating surface, and the opening closing surface closes the opening, and when the biasing force or the electromagnetic force moves the movable core in a direction away from the valve rubber seating surface of the main body, the cylindrical portion of the valve rubber becomes shortened, the valve rubber moves further away from the valve rubber seating surface, and the opening closing surface further opens the opening.

[0019] According to this, the unloaded state (natural state) of the tubular portion does not correspond to either a state in which the opening-closing surface closes the opening or a state in which the opening-closing surface is furthest from the opening, but rather corresponds to a state between the two (preferably an intermediate state). Therefore, although the deformation of the tubular portion includes both elongation and contraction, the maximum deformation values ​​(also called amplitudes) of each are kept smaller than when only elongation occurs (the natural state corresponds to the maximum open state) or when only contraction occurs (the natural state corresponds to the closed state). (If an intermediate position is selected, the maximum deformation values ​​for elongation and contraction are equal, i.e., half of each other.) This suppresses the occurrence of strain due to deformation, further improving the durability of the valve rubber.

[0020] Here, it is most preferable that the ratio between the closing stroke of the cylindrical portion from its unloaded state to its extended state where the valve rubber seats on the valve rubber seating surface and the opening closing surface closes the opening, and the opening stroke of the cylindrical portion from its unloaded state to its contracted state where the valve rubber further moves away from the valve rubber seating surface and the opening closing surface further opens the opening, is 1:1 (in this case, the maximum deformation is equal for the extension deformation and the contraction deformation, being 1 / 2 for each), but the effects of the present invention can be expected if the ratio is within the range of 2:1 to 1:2 (preferably within the range of 3:2 to 2:3).

[0021] The present invention also provides a valve comprising: a main body having a valve rubber seating surface on which at least one flow path opens; a valve rubber provided to seat on the valve rubber seating surface of the main body; a movable core for holding the valve rubber; an electromagnetic force application unit that applies an electromagnetic force to the moving core, thereby moving the moving core in one direction relative to the valve rubber seating surface of the main body, thereby moving the valve rubber in one direction relative to the valve rubber seating surface; and a biasing member that applies a biasing force to the moving core when the electromagnetic force application unit is not applying an electromagnetic force to the moving core, thereby moving the moving core in the other direction relative to the valve rubber seating surface of the main body, thereby moving the valve rubber in the other direction relative to the valve rubber seating surface. This is a rubber-type solenoid valve, wherein a portion of the valve rubber is fixed to the main body, and when the electromagnetic force or the biasing force causes the moving core to move toward the valve rubber seating surface of the main body, the valve rubber elastically deforms in the direction toward the valve rubber seating surface, causing the valve rubber to seat on the valve rubber seating surface and close the opening; and when the biasing force or the electromagnetic force causes the moving core to move away from the valve rubber seating surface of the main body, the valve rubber elastically deforms in the direction away from the valve rubber seating surface, causing the valve rubber to move further away from the valve rubber seating surface and further open the opening.

[0022] According to the present invention, the unloaded state (natural state) of the valve rubber does not correspond to either the state in which the opening is closed or the state in which it is furthest from the opening, but corresponds to a state between the two (preferably an intermediate state). Therefore, although the deformation of the valve rubber includes both elastic deformation toward the valve rubber seating surface and elastic deformation away from the valve rubber seating surface, the maximum deformation values ​​(also called amplitudes) of each are kept smaller than when only elastic deformation occurs toward the valve rubber seating surface or when only elastic deformation occurs away from the valve rubber seating surface (if an intermediate position is selected, the maximum deformation values ​​for the elastic deformation toward the valve rubber seating surface and the elastic deformation away from the valve rubber seating surface are equal, i.e., 1 / 2). This suppresses the occurrence of strain due to deformation, further improving the durability of the valve rubber.

[0023] Here, it is most preferable that the ratio of the closing stroke of the valve rubber, from its unloaded state until it elastically deforms in a direction toward the valve rubber seating surface and seats on the valve rubber seating surface to close the opening, to the opening stroke of the valve rubber, from its unloaded state until it elastically deforms in a direction away from the valve rubber seating surface and further moves away from the valve rubber seating surface to further open the opening, is 1:1 (in this case, the maximum deformation values ​​for extension deformation and contraction deformation are equal, being 1 / 2 for each), but the effects of the present invention can be expected if the ratio is within the range of 2:1 to 1:2 (preferably within the range of 3:2 to 2:3). [Effects of the Invention]

[0024] According to one aspect of the present invention, the elastic deformation of the valve rubber is achieved by utilizing the expansion and contraction deformation of the tubular portion, eliminating the need for a thin-walled portion, thereby fundamentally eliminating the durability problem caused by the existence of the thin-walled portion.

[0025] According to another aspect of the present invention, the unloaded state of the valve rubber does not correspond to either the state in which the opening is closed or the state in which it is furthest from the opening, but corresponds to any state between the two. Therefore, although the deformation of the valve rubber includes both elongation and contraction, the maximum value of each deformation is kept smaller than when only elongation or contraction occurs. This suppresses the occurrence of strain due to deformation, further improving the durability of the valve rubber. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic vertical cross-sectional view of a rubber valve type solenoid valve according to an embodiment of the present invention; [Figure 2] FIG. 2 is a longitudinal cross-sectional view of a valve rubber of the valve rubber type solenoid valve of FIG. 1. [Figure 3] FIG. 2 is a front view of a moving core of the rubber valve type solenoid valve of FIG. 1. [Figure 4] FIG. 2 is a longitudinal sectional view of a main body of the rubber valve type solenoid valve of FIG. 1. [Figure 5] FIG. 2 is a perspective view of a valve rubber seating surface of the valve rubber type solenoid valve of FIG. 1. [Figure 6] 2 is a schematic diagram of the rubber valve type solenoid valve of FIG. 1 in a valve closed state. FIG. [Figure 7] 2 is a schematic diagram of the rubber valve type solenoid valve of FIG. 1 in a maximum valve opening state. [Figure 8] FIG. 10 is a schematic vertical cross-sectional view of a rubber valve type solenoid valve according to another embodiment of the present invention. [Figure 9] 9 is a schematic diagram of the rubber valve type solenoid valve of FIG. 8 in a valve closed state. [Figure 10] 9 is a schematic diagram of the rubber valve type solenoid valve of FIG. 8 in a valve maximum open state. [Figure 11] FIG. 1 is a schematic cross-sectional view of a conventional rubber valve type solenoid valve. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0028] (composition) FIG. 1 is a schematic longitudinal cross-sectional view of a rubber valve type solenoid valve according to one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a valve rubber of the rubber valve type solenoid valve of FIG. 1, FIG. 3 is a front view of a moving core of the rubber valve type solenoid valve of FIG. 1, FIG. 4 is a longitudinal cross-sectional view of the main body of the rubber valve type solenoid valve of FIG. 1, and FIG. 5 is a perspective view of the valve rubber seating surface of the rubber valve type solenoid valve of FIG. 1.

[0029] As shown in Figure 1, the valve rubber type solenoid valve 1 of this embodiment comprises a main body 10 having a valve rubber seating surface 12 with one opening 10a, a valve rubber 23 arranged to seat on the valve rubber seating surface 12 of the main body 10, and a moving core 21 that holds the valve rubber 23.

[0030] The movable core 21 is provided so as to be movable in the axial direction relative to the fixed core 52 via a coil spring 51 (an example of a biasing member).

[0031] The coil spring 51 exerts an elastic force (an example of a biasing force) on the movable core 21, thereby biasing the movable core 21 against the valve rubber seating surface 12 of the main body portion 10, and causing the opening closing surface portion 23a of the valve rubber 23 to abut (seat) against the valve rubber seating surface 12 (the tubular portion 23b is stretched and deformed: see Figure 6).

[0032] The rubber valve type solenoid valve 1 of this embodiment further includes an electromagnetic force application unit 40 (specifically, for example, an electromagnetic coil) that applies an electromagnetic force to the moving core 21, moving the moving core 21 relative to the valve rubber seating surface 12 of the main body 10, and thereby moving the valve rubber 23 relative to the valve rubber seating surface 12. As shown in FIG. 1 , the electromagnetic force application unit 40, the fixed core 52, and the upper end of the main body 10 are covered with a cover 53.

[0033] The electromagnetic force acting portion 40 of this embodiment applies an electromagnetic force to the moving core 21, moving the moving core 21 in a direction away from the valve rubber seating surface 12 of the main body portion 10, thereby moving the valve rubber 23 away from the valve rubber seating surface 12 (the tubular portion 23b is shortened and deformed: see Figure 7).

[0034] However, at the time of filing this application, the present invention does not exclude a pattern in which the valve rubber 23 is subjected to an elastic force and is separated from the valve rubber seating surface 12 before an electromagnetic force is applied to the moving core 21, and the valve rubber 23 abuts (seats) against the valve rubber seating surface 12 (the tubular portion 23b is stretched and deformed) when an electromagnetic force is applied to the moving core 21.

[0035] 2, the valve rubber 23 of this embodiment has an opening closing surface portion 23a, a cylindrical portion 23b extending from the opening closing surface portion 23a toward the moving core 21, and a flange portion 23c extending annularly outward from the end of the cylindrical portion 23b on the moving core 21 side. The valve rubber 23 of this embodiment is made of EPDM (ethylene propylene diene rubber) and has a hardness of, for example, A70±5.

[0036] 3, the moving core 21 has a truncated cone-shaped portion 21a at the end on the opening closing surface portion 23a side. As shown in FIG. 1, the opening closing surface portion 23a of the valve rubber 23 is fixed to the truncated cone-shaped portion 21a of the moving core 21 so as to cover the truncated cone-shaped portion 21a. The moving core 21 of this embodiment is made of magnetic stainless steel (K-M31).

[0037] As shown in Figures 1 and 3, the movable core 21 has a fourth cylindrical portion 21e on the fixed core 52 side, a third cylindrical portion 21d that forms a step portion 21s between itself and the fourth cylindrical portion 21e, a second cylindrical portion 21c that penetrates the tubular portion 23b of the valve rubber 23, and a first cylindrical portion 21b that connects the second cylindrical portion 21c and the truncated cone-shaped portion 21a.

[0038] To give an example of dimensions, the fourth cylindrical portion 21e is 5 mm in length and 3.9 mm in diameter, the third cylindrical portion 21d is 8.1 mm in length and 5.0 mm in diameter, the second cylindrical portion 21c is 4.1 mm in length and 1.8 mm in diameter, the first cylindrical portion 21b is 0.4 mm in length and 1.0 mm in diameter, and the truncated cone-shaped portion 21a is 0.9 mm in length, has a maximum diameter of 1.8 mm, and has an apex angle of approximately 60°.

[0039] The coil spring 51 has a natural length of 7.7 mm and is inserted in a compressed state between the step portion 21s and the fixed core 52 (in the opening closed state (see FIG. 6), the coil spring length is 5.3 mm). The spring constant of the coil spring 51 is 0.9 N / mm.

[0040] Returning to FIG. 2, the opening closing surface portion 23a of the valve rubber 23 is a cylindrical portion with a diameter of 3 mm and a height of 1.5 mm, and a truncated conical recess 23r is provided in the upper center portion to engage with the truncated conical portion 21a of the moving core 21. The truncated conical recess 23r has an apex angle of approximately 60°, a bottom diameter (maximum diameter) of 1.8 mm (designated R0.1), and an upper end portion with R0.2. The height of the opening closing surface 23a to the upper surface of this R0.2 region is 1.5 mm, and the depth of the truncated conical recess 23r to the upper surface of the R0.2 region is 1.0 mm. The R0.2 region is designed to engage with the first cylindrical portion 21b of the moving core 21.

[0041] The tubular portion 23b of the valve rubber 23 is a cylindrical portion with an inner diameter of 2.0 mm, an outer diameter of 3.0 mm, and a length of 3.0 mm, and extends from the upper surface of the opening closing surface portion 23a toward the moving core 21. The upper surface of the opening closing surface portion 23a and the inner surface of the tubular portion 23b are smoothly connected (by being rounded) (for example, R0.2). The inner surface of the tubular portion 23b and the upper surface of the tubular portion 23b are also smoothly connected (by being rounded) (for example, R0.3).

[0042] The flange portion 23c of the valve rubber 23 extends annularly outward from the end of the cylindrical portion 23b on the moving core 21 side. The flange portion 23c of this embodiment has an outer diameter of 8.0 mm and a uniform thickness of 1.0 mm. That is, the flange portion 23c of this embodiment does not have a thin-walled portion. Meanwhile, the lower surface of the outer peripheral region of the flange portion 23c is provided with a semicircular annular protrusion 23p with a cross section of R0.5 for fixing to the main body 10. In addition, the outer surface of the cylindrical portion 23b and the lower surface of the flange portion 23c are smoothly connected (by being rounded) (for example, R0.5). The lower surface of the flange portion 23c and the protrusion 23p are also smoothly connected (by being rounded) (for example, R0.3).

[0043] 4, the main body 10 of this embodiment is provided with a large diameter hole 10d in which the flange portion 23c of the valve rubber 23 is placed. The large diameter hole 10d is a cylindrical hole with a diameter of 8.1 mm and a height of 3.2 mm.

[0044] 1, the flange portion 23c placed in the large diameter hole 10d is fixed to the main body 10 in a state compressed from above via an annular pressing part (also called an adapter) 42 and an electromagnetic force application part 40. Specifically, the height of the annular pressing part 42 is 3.6 mm, and the flange portion 23c is fixed in a state where the annular raised part 23p is compressed by 0.3 mm.

[0045] A small-diameter hole 10c is provided coaxially below the large-diameter hole 10d. The small-diameter hole 10c is a cylindrical hole with a diameter of 5.0 mm and a height of 3.8 mm. The cylindrical portion 23b and the opening-closing surface portion 23a are inserted into the small-diameter hole 10c.

[0046] Here, a feature of this embodiment is that when neither electromagnetic force nor elastic force is acting, i.e., when the valve rubber 23 is in an unloaded state, the opening closing surface portion 23a (its bottom surface) is positioned at a height half the maximum opening height from the valve rubber seating surface 12.

[0047] The area of ​​the main body 10 on the valve rubber seating surface 12 side is formed as a cylindrical protrusion from the bottom surface of the small diameter hole 10c. The cylindrical protrusion has an outer diameter of 2.0 mm and a height of 0.5 mm.

[0048] An opening 10a (diameter 0.8 mm) is provided coaxially with the large diameter hole 10d and the small diameter hole 10c in the valve rubber seating surface 12. Another opening 10b (diameter 1.2 mm) is provided in the bottom surface of the small diameter hole 10c at a position away from the cylindrically raised area (which provides the valve rubber seating surface 12) (see Figure 5).

[0049] The flow paths leading to the openings 10a and 10b extend downward in the main body 10, and then extend away from each other symmetrically. The diameter of the horizontally extending portion of each flow path is, for example, The depth of the flow path to the axis of this portion is, for example, about 2.0 mm with the bottom surface of the small diameter hole 10c as the reference, and this portion is continuous with a screw hole for connecting piping.

[0050] The main body 10 of this embodiment, including the valve rubber seating surface 12, is formed by injection molding from PPS resin. However, PBT resin may be used instead of PPS resin. Furthermore, the area providing the valve rubber seating surface 12 and the area below it may be configured as separate bodies made of different materials.

[0051] (action) When the electromagnetic force application unit 40 is not applying an electromagnetic force to the moving core 21, the elastic force of the coil spring 51 urges the moving core 21 in a direction approaching the valve rubber seating surface 12 of the main body 10. As a result, as shown in Fig. 6, the cylindrical portion 23b of the valve rubber 23 is in an extended state, and the valve rubber 23 is seated on the valve rubber seating surface 12, with the opening closing surface portion 23a closing the opening 10a.

[0052] Based on a control command from a control device (not shown), the electromagnetic force application unit 40 applies an electromagnetic force to the moving core 21. This causes the moving core 21 to move in a direction away from the valve rubber seating surface 12 of the main body 10, and accordingly the valve rubber 23 moves in a direction away from the valve rubber seating surface 12. As a result, as shown in Figure 7, the tubular portion 23b of the valve rubber 23 becomes contracted, and the valve rubber 23 moves away from the valve rubber seating surface 12, opening the opening 10a.

[0053] In this embodiment, the closing stroke of the cylindrical portion 23b from the unloaded state of the cylindrical portion 23b to the state in which the cylindrical portion 23b is extended, the valve rubber 23 seats on the valve rubber seating surface 12, and the opening closing surface portion 23a closes the opening 10a is approximately 0.15 mm.

[0054] In addition, in this embodiment, the opening stroke of the cylindrical portion 23b from the unloaded state of the cylindrical portion 23b to the state in which the cylindrical portion 23b is contracted, the valve rubber 23 moves further away from the valve rubber seating surface 12, and the opening closing surface portion 23a further opens the opening 10a is approximately 0.15 mm.

[0055] That is, in this embodiment, the ratio of the closing stroke of the cylindrical portion 23b to the opening stroke of the cylindrical portion 23b is approximately 1:1.

[0056] (effect) According to the rubber valve type solenoid valve 1 of this embodiment configured as described above, the elastic deformation of the valve rubber 23 is achieved by utilizing the expansion and contraction deformation of the cylindrical portion 23b, so there is no need to provide a thin-walled portion. This makes it possible to fundamentally solve the durability problem caused by the existence of a thin-walled portion.

[0057] Specifically, the flange portion 23c of this embodiment does not have a so-called thin portion, and has a thickness of 1.0 mm or more at any position, thereby achieving extremely high durability.

[0058] Furthermore, according to this embodiment, the moving core 21 has a truncated cone-shaped portion 21a at the end on the opening closing surface portion 23a side, and the opening closing surface portion 23a of the valve rubber 23 is fixed to the truncated cone-shaped portion 21a so as to cover the truncated cone-shaped portion 21a of the moving core 21. This effectively prevents undesired detachment between the moving core 21 and the opening closing surface portion 23a of the valve rubber 23.

[0059] Furthermore, according to this embodiment, the electromagnetic force acting unit 40 applies an electromagnetic force to the moving core 21, moving the moving core 21 in a direction away from the valve rubber seating surface 12 of the main body 10, thereby moving the valve rubber 23 in a direction away from the valve rubber seating surface 12; when the electromagnetic force acting unit 40 is not applying an electromagnetic force to the moving core 21, the coil spring 51 applies an elastic force to the moving core 21, moving the moving core 21 in a direction approaching the valve rubber seating surface 12 of the main body 10, thereby moving the valve rubber 23 in a direction approaching the valve rubber seating surface 12.

[0060] When only elastic force is acting (when electromagnetic force is not acting), the cylindrical portion 23b of the valve rubber 23 is in an extended state, and the valve rubber 23 is seated on the valve rubber seating surface 12, so that the opening closing surface portion 23a closes the opening 10a.When electromagnetic force is acting (elastic force is also acting, but the electromagnetic force exceeds the elastic force), the cylindrical portion 23b of the valve rubber 23 is in a contracted state, and the valve rubber 23 moves further away from the valve rubber seating surface 12, so that the opening closing surface portion 23a further opens the opening 10a.

[0061] That is, in the rubber valve type solenoid valve 1 of this embodiment, the no-load state (natural state) of the tubular portion 23b does not correspond to either a state in which the opening closing surface 23a closes the opening 10a or a state in which the opening closing surface 23a is furthest from the opening 10a, but corresponds to an intermediate state between the two. Therefore, although the deformation of the tubular portion 23b includes both elongation and contraction, the maximum value of each of these deformations is kept smaller than when only elongation occurs (the natural state corresponds to the maximum open state) or when only contraction occurs (the natural state corresponds to the closed state). This suppresses the occurrence of strain due to deformation, further improving the durability of the valve rubber 23.

[0062] In this embodiment, the ratio of the closing stroke of the cylindrical portion 23b to the opening stroke of the cylindrical portion 23b is 1:1, but the effects of the present invention can be expected if the ratio is within the range of 2:1 to 1:2 (preferably within the range of 3:2 to 2:3).

[0063] Furthermore, the rubber valve type solenoid valve 1 of this embodiment is designed to maintain the open / closed state by the elastic force of the coil spring 51. Therefore, no power consumption is required in the open / closed state, resulting in a high energy saving effect.

[0064] Specifically, the inventors of the present invention confirmed that when ink from a commercial printer is applied as the fluid to the rubber valve solenoid valve 1 of this embodiment and the pressure range applied to the IN side flow path is set to -70 to 420 kPa, the flow / blocking of the ink can be smoothly controlled and the control performance can be made to have a long life.

[0065] In the embodiment described above, only one opening 10a is provided on the valve rubber seating surface 12, and another opening 10b is provided on the bottom surface of the small diameter hole 10c, but this is not limited to this form, and a type in which two openings are provided on the valve rubber seating surface 12 may also be adopted.

[0066] Furthermore, in the embodiment described above, the coil spring 51, which is an elastic member, is used as the biasing means, but instead, a mechanism or configuration that applies air pressure or liquid pressure to the moving core 21 may be used.

[0067] Furthermore, the feature that the no-load state (natural state) of the valve rubber does not correspond to either the state in which the opening is closed or the state in which it is furthest from the opening, but corresponds to a state intermediate between the two, is also effective in other types of solenoid valves different from the embodiments described above.

[0068] As such an example, a rubber valve type solenoid valve according to another embodiment of the present invention will be described with reference to FIGS.

[0069] FIG. 8 is a schematic longitudinal cross-sectional view of a rubber valve type solenoid valve according to another embodiment of the present invention, FIG. 9 is a schematic view of the rubber valve type solenoid valve in a valve closed state, and FIG. 10 is a schematic view of the rubber valve type solenoid valve in a valve maximum open state.

[0070] (composition) As shown in Figure 8, the valve rubber type solenoid valve 201 of this embodiment includes a main body 210 having a valve rubber seating surface 212 with one opening 210a, a valve rubber 223 arranged to seat on the valve rubber seating surface 212 of the main body 210, and a movable core 221 that holds the valve rubber 223.

[0071] Unlike the rubber valve type solenoid valve 1 described with reference to FIGS. 1 to 7, the rubber valve 223 in the rubber valve type solenoid valve 201 of this embodiment is in the form of a conventionally known diaphragm valve (see FIG. 11).

[0072] On the other hand, similarly to the rubber valve type solenoid valve 1 described with reference to Figures 1 to 7, the movable core 221 is arranged to be movable in the axial direction relative to the fixed core 252 via a coil spring 251 (an example of a biasing member).

[0073] The coil spring 251 exerts an elastic force (an example of a biasing force) on the movable core 221, thereby biasing the movable core 221 against the valve rubber seating surface 212 of the main body 210 and causing the valve rubber 223 to abut (seat) against the valve rubber seating surface 212 (see Figure 9).

[0074] 1 to 7, the rubber valve type solenoid valve 201 of this embodiment further includes an electromagnetic force application unit 240 (specifically, for example, an electromagnetic coil) that applies an electromagnetic force to the moving core 221 and moves the moving core 221 relative to the valve rubber seating surface 212 of the main body 210, thereby moving the valve rubber 223 relative to the valve rubber seating surface 212. As shown in FIG. 8, the electromagnetic force application unit 240, the fixed core 252, and the upper end of the main body 210 are covered with a cover 253.

[0075] The electromagnetic force acting portion 240 of this embodiment applies an electromagnetic force to the moving core 221, moving the moving core 221 in a direction away from the valve rubber seating surface 212 of the main body portion 210, thereby moving the valve rubber 223 away from the valve rubber seating surface 212 (see Figure 10).

[0076] However, at the time of filing this application, the present invention does not exclude a pattern in which the valve rubber 223 is subjected to an elastic force and is separated from the valve rubber seating surface 212 before an electromagnetic force is applied to the moving core 221, and the valve rubber 223 abuts (seats) against the valve rubber seating surface 212 when an electromagnetic force is applied to the moving core 221.

[0077] Moreover, the valve rubber 223 of this embodiment is made of EPDM (ethylene propylene diene rubber) and has a hardness of, for example, A70±5.

[0078] 8, the moving core 221 has a truncated cone-shaped portion at the end on the opening closing surface side. As shown in Fig. 8, the opening closing surface of the valve rubber 223 is fixed to the truncated cone-shaped portion so as to cover the truncated cone-shaped portion of the moving core 221. The moving core 221 of this embodiment is made of magnetic stainless steel (K-M31).

[0079] Coil spring 251 has a natural length of 7.7 mm and is inserted in a compressed state between the step portion and fixed core 252 (in the opening closed state (see FIG. 9), the coil spring length is 5.3 mm). The spring constant of coil spring 251 is 0.9 N / mm.

[0080] As shown in FIG. 8, the main body 210 of this embodiment is provided with a large diameter hole in which the flange of the valve rubber 223 is placed.

[0081] As shown in FIG. 8, the flange portion of the valve rubber 223 placed in the large diameter hole is fixed to the main body portion 210 in a compressed state from above via an annular pressing part (also called an adapter) 242 and an electromagnetic force application part 240.

[0082] A small diameter hole is provided coaxially below the large diameter hole, and the area of ​​the main body 210 on the valve rubber seating surface 212 side is formed as a cylindrical protruding area from the bottom surface of the small diameter hole.

[0083] Here, a feature of this embodiment is that when neither electromagnetic force nor elastic force is acting, i.e., when the valve rubber 223 is in an unloaded state, the opening closing surface (bottom surface) of the valve rubber 223 is located at a height half the maximum opening height from the valve rubber seating surface 212 (see Figure 8).

[0084] Other configurations of the rubber valve type solenoid valve 201 of this embodiment are substantially the same as those of the rubber valve type solenoid valve 1 described with reference to FIGS.

[0085] (action) When the electromagnetic force application unit 240 is not applying an electromagnetic force to the moving core 21, the elastic force of the coil spring 251 urges the moving core 221 in a direction approaching the valve rubber seating surface 212 of the main body unit 210. As a result, as shown in Fig. 9, the valve rubber 223 is in an elastically deformed state, and the valve rubber 223 seats on the valve rubber seating surface 212, causing the opening closing surface to close the opening 210a.

[0086] Based on a control command from a control device (not shown), the electromagnetic force application unit 240 applies an electromagnetic force to the moving core 221. As a result, the moving core 221 is moved in a direction away from the valve rubber seating surface 212 of the main body 210, and accordingly the valve rubber 223 is moved in a direction away from the valve rubber seating surface 212. As a result, as shown in Figure 10, the valve rubber 223 is elastically deformed in the opposite direction, and the valve rubber 223 moves away from the valve rubber seating surface 212, opening the opening 210a.

[0087] In this embodiment, the closing stroke of the valve rubber 223 from the no-load state of the valve rubber 223 to the state where the valve rubber 223 is elastically deformed and the valve rubber 223 is seated on the valve rubber seating surface 212 and the opening closing surface portion closes the opening 210a is approximately 0.15 mm.

[0088] In addition, in this embodiment, the opening stroke of the valve rubber 223 from the no-load state to the state in which the valve rubber 223 elastically deforms in the opposite direction, further separating from the valve rubber seating surface 212 and causing the opening closing surface portion to further open the opening 210a, is approximately 0.15 mm.

[0089] That is, in this embodiment, the ratio of the closing stroke of the valve rubber 223 to the opening stroke of the valve rubber 223 is approximately 1:1.

[0090] (effect) According to this embodiment, the electromagnetic force application unit 240 applies an electromagnetic force to the moving core 221, moving the moving core 221 in a direction away from the valve rubber seating surface 212 of the main body portion 210, thereby moving the valve rubber 223 in a direction away from the valve rubber seating surface 212. When the electromagnetic force application unit 240 is not applying an electromagnetic force to the moving core 221, the coil spring 251 applies an elastic force to the moving core 221, moving the moving core 221 in a direction approaching the valve rubber seating surface 212 of the main body portion 210, thereby moving the valve rubber 223 in a direction approaching the valve rubber seating surface 212.

[0091] When only elastic force is acting (when electromagnetic force is not acting), the valve rubber 223 is in an elastically deformed state, and the valve rubber 223 sits on the valve rubber seating surface 212, causing the opening closing surface to close the opening 210a, and when electromagnetic force is acting (elastic force is also acting, but the electromagnetic force exceeds the elastic force), the valve rubber 223 is in an elastically deformed state in the opposite direction, and the valve rubber 223 moves further away from the valve rubber seating surface 212, causing the opening closing surface to further open the opening 210a.

[0092] That is, in the rubber valve type solenoid valve 201 of this embodiment, the no-load state (natural state) of the rubber valve 223 does not correspond to either a state in which the opening closing surface closes the opening 210a or a state in which the opening closing surface is furthest from the opening 210a, but corresponds to an intermediate state between the two. Therefore, although the elastic deformation of the rubber valve 223 includes both downward elastic deformation and upward elastic deformation, the maximum value of each of these deformations is kept smaller than when only downward elastic deformation occurs (the natural state corresponds to the maximum open state) or when only upward elastic deformation occurs (the natural state corresponds to the closed state). This suppresses the occurrence of strain due to deformation, improving the durability of the rubber valve 223.

[0093] In this embodiment, the ratio of the closing stroke of the valve rubber 223 to the opening stroke of the valve rubber 223 is 1:1, but the effects of the present invention can be expected if the ratio is within the range of 2:1 to 1:2 (preferably within the range of 3:2 to 2:3). [Explanation of symbols]

[0094] 1 rubber solenoid valve 10 Main body 10a opening 10b opening 10c small diameter hole 10d large diameter hole 12 Valve rubber seating surface 21 Mobile Core 21a truncated cone-shaped portion 21b First cylindrical part 21c Second cylindrical section 21d Third cylindrical section 21e Fourth cylindrical section 21s Step 23 Valve rubber 23a Opening closing surface part 23b Cylindrical part 23c Flange 23p ridge 23r truncated cone recess 40 Electromagnetic force acting part 42 Clamping parts 51 Coil spring 52 fixed core 53 Cover 110 Main body 110a First flow path 110b Second flow path 110w partition wall 112 Diaphragm seating surface 122 Diaphragm boss 122e Small diameter section 122m Surrounded body part 123 Diaphragm 123a Thick outer periphery 123b Thin wall part 123c Diaphragm boss enclosure 201 Rubber solenoid valve 210 Main body 210a aperture 212 Valve rubber seating surface 221 Mobile Core 223 Valve rubber 240 Electromagnetic force acting part 251 Coil spring 252 fixed core 253 Cover

Claims

1. a main body having a valve rubber seating surface on which at least one flow path opens; a valve rubber provided to be seated on the valve rubber seating surface of the main body; a moving core that holds the valve rubber; an electromagnetic force application unit that applies an electromagnetic force to the moving core to move the moving core relative to the valve rubber seating surface of the main body, thereby moving the valve rubber relative to the valve rubber seating surface; A rubber valve type solenoid valve comprising: the valve rubber has an opening closing surface portion, a cylindrical portion extending from the opening closing surface portion toward the moving core, and a flange portion extending annularly outward from an end portion of the cylindrical portion facing the moving core, an outer peripheral region of the flange portion is fixed to the main body portion; The opening closing surface portion is fixed to the moving core, while the cylindrical portion is not fixed to the moving core and is capable of expanding and contracting relative to the moving core. A rubber valve type solenoid valve.

2. The flange portion has a thickness of 0.8 mm or more at any position.

2. The rubber valve type solenoid valve according to claim 1.

3. The moving core has a truncated cone-shaped portion at an end portion on the opening closing surface portion side, The opening closing surface portion of the valve rubber is fixed to the truncated cone-shaped portion of the moving core so as to cover the truncated cone-shaped portion.

3. The rubber valve type solenoid valve according to claim 1 or 2.

4. the electromagnetic force application unit applies an electromagnetic force to the moving core, and moves the moving core in one direction relative to the valve rubber seating surface of the main body unit, thereby moving the valve rubber in one direction relative to the valve rubber seating surface, a biasing member is further provided that, when the electromagnetic force application unit is not applying an electromagnetic force to the moving core, applies a biasing force to the moving core, moving the moving core in another direction relative to the valve rubber seating surface of the main body portion, thereby moving the valve rubber in the other direction relative to the valve rubber seating surface, when the movable core is moved in a direction approaching the valve rubber seating surface of the main body portion by the electromagnetic force or the biasing force, the cylindrical portion of the valve rubber is in an elongated state, the valve rubber is seated on the valve rubber seating surface, and the opening closing surface portion closes the opening, When the moving core is moved in a direction away from the valve rubber seating surface of the main body portion by the biasing force or the electromagnetic force, the cylindrical portion of the valve rubber is contracted, causing the valve rubber to further move away from the valve rubber seating surface, and the opening closing surface portion further opens the opening.

4. The rubber valve type solenoid valve according to claim 1.

5. a closing stroke of the cylindrical portion from an unloaded state of the cylindrical portion to a state in which the cylindrical portion is in an elongated state, the valve rubber is seated on the valve rubber seating surface, and the opening closing surface portion closes the opening; The opening stroke of the cylindrical portion from the no-load state of the cylindrical portion to the state where the cylindrical portion is contracted, the valve rubber further moves away from the valve rubber seating surface, and the opening closing surface further opens the opening is defined as: It is within the range of 2:1 to 1:2 5. The rubber valve type solenoid valve according to claim 4.

6. The closing stroke and the opening stroke are: It is within the range of 3:2 to 2:

3.

6. The rubber valve type solenoid valve according to claim 5.

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