JPH058151U - Solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] In a solenoid valve in which a fixed core is fixed to a casing made of a magnetic material while being fitted in a hole provided in the casing, generation of cutting chips is prevented and axial position is prevented. The fixed core can be fixed to the casing so as to securely hold the fixed core. [Structure] A locking recess 32 is provided on the outer surface of the fixed core 29, and a part of the inner surface of the hole 15 of the casing is pressed inward in the radial direction while the fixed core 29 is fitted. And is caulkedly engaged with the locking recess 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  According to the present invention, a casing made of a magnetic material is fitted into a hole provided in the casing. The present invention relates to a solenoid valve in which a fixed core is fixed in a combined state.

[0002]

[Prior art]

  Conventionally, in the above solenoid valve, a fixed core is press-fitted and fixed in a hole of a casing. Is common.

[0003]

[Problems to be solved by the device]

  However, if the fixed core is press-fitted into the casing as in the conventional case, The inner surface of the hole is scraped off to generate cutting chips, and the cutting chips remaining inside the solenoid valve It may not be possible to obtain a reliable closed state due to the interposition of the seats. Fixed core after press fitting The fixed core may move in the axial direction when an axial force is applied to the It may not be possible to reliably hold the axial position of the core.

[0004]   The present invention has been made in view of such circumstances, and it is possible to prevent the generation of chips. Both can secure the stationary core to the casing by ensuring that it retains its axial position. It is an object of the present invention to provide a solenoid valve having such a structure.

[0005]

[Means for Solving the Problems]

  To achieve the above object, according to a first aspect of the present invention, the outer surface of the fixed core is provided. Is provided with a locking recess, and a part of the inner surface of the hole of the casing fits the fixed core. In this state, it is caulkedly engaged with the locking recess according to the radially inward pressurization.

[0006]   According to a second feature of the present invention, a plurality of positions spaced in the circumferential direction of the casing are provided. Insert a jig that presses a part of the inner surface of the hole corresponding to the locking recess inward in the radial direction. A caulking recess is provided on the outer surface of the casing so that it can be inserted and the inner end is closed. It

[0007]

【Example】

  An embodiment of the present invention will be described below with reference to the drawings.

[0008]   FIG. 1 is a vertical cross-sectional view of a normally open solenoid valve to which the present invention is applied. 2 is an enlarged view of part 2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 1, and FIG. 4 is a vertical cross-sectional view showing a fixed core fixed, and FIG. 5 is a vertical sectional side view showing an air gap adjustment. 6 and 6 are enlarged cross-sectional views of the main parts of FIG.

[0009]   First, in FIG. 1, the casing C of the normally open solenoid valve is made of iron-based metal or the like. First case member 4 made of magnetic metal and second case member made of stainless steel or the like 5 and 5 are connected to each other. The first case member 4 is formed in a thick cylindrical shape. The first yoke portion 6 and the cylindrical shape that is coaxially connected to the outer periphery of the first yoke portion 6 via a step. The second yoke portion 7 is integrally provided, and the end portion of the second yoke portion 7 is provided with a thin portion 9 via a step portion 8. Is provided. The second case member 5 is formed in a cap shape, The outer peripheral edge of the second case member 5 is brought into contact with the step portion 8 of the second yoke portion 7. By caulking the thin portion 9 so as to cover the first and second case members 4, 5 Are joined together to form a casing C.

[0010]   At the central portion of the first yoke portion 6 of the first case member 4, the outer end in the axial direction is offset. The first hole 11 is provided in the shaft, and the diameter increases in order toward the inner side in the axial direction. In this way, the second hole 12, the third hole 13, the fourth hole 14, and the fifth hole 15 which are continuous with the first hole 11 And the sixth hole 16 is provided coaxially with a step between them. Thus, the first hole 11 Has a valve hole 17 coaxial with the first hole 11 and is basically formed in a cylindrical shape. The material 18 is press-fitted and fixed.

[0011]   In FIG. 2, the valve seat member 18 is provided with a tapered surface 18a on the outer peripheral portion on the tip side thereof. And the step portion 10 between the first hole 11 and the second hole 12 has a depth d. It is pressed into the first hole 11 by crushing it only. As a result, the chips generated on the inner surface of the first hole 11 when the valve seat member 18 is press-fitted into the first hole 11 are removed. , Stays in the annular chamber formed between the first hole 11 and the step portion 10 and the tapered surface 18a. It is possible to prevent the chips from entering the second hole 12 side.

[0012]   Between the first yoke portion 6 of the first case member 4 and the second case member 5, there is a first yoke member. The coil 24 wound around the bobbin 23 and configured in a cylindrical shape in order from the portion 6 side, and the iron. The third yoke portion 19 formed in a ring shape is sandwiched by a magnetic metal such as a group metal. . That is, the first and third yoke portions 6, 19 are arranged on both sides of the coil 24 in the axial direction. Thus, the coil 24 is surrounded by the second yoke portion 7.

[0013]   The first and third yoke portions 6 and 19 are coaxial with the second yoke portion 7 within the coil 24. It is connected via a plunger guide 25 arranged on one side. The nudger guide 25 is formed of a non-magnetic material such as stainless steel into a cylindrical shape. The non-magnetic cylindrical body 26 that is brazed to the first yoke portion 6 and is made of a magnetic material such as It is formed of electromagnetic soft iron into a cylindrical shape having the same inner and outer diameters as the non-magnetic cylindrical body 26, and 2 Cylindrical magnetic cylinder fitted in the third yoke portion 19 so as to be received by the case member 5 The body 27 is coaxially connected by brazing. Moreover, the non-magnetic cylinder 2 6 is formed so as to have a length extending over substantially the entire length along the axial direction of the coil 24. ing.

Referring also to FIG. 3, a fixed core 29 formed of a magnetic metal such as an iron-based metal in a cylindrical shape is fitted to the end portion of the plunger guide 25 on the first yoke portion 6 side. The fixed core 29 is fixed in a state in which it is fitted in the fifth hole 15 up to a position where a slight gap L ₁ is provided between the fixed core 29 and the step portion between the fourth hole 14 and the fifth hole 15 of the first yoke portion 6. To be done. That is, in the first yoke portion 6, a pair of caulking recesses 30 and 30 whose inner ends are closed at a plurality of positions spaced in the circumferential direction, for example, on one diameter line of a portion corresponding to the fifth hole 15. Are provided, and these caulking recesses 30, 30 are opened to annular grooves 31 provided on the outer periphery of the first yoke portion 6, respectively. On the other hand, the fixed core 29 is provided with a pair of locking recesses 32, 32 which are axially spaced at positions corresponding to the caulking recesses 30, 30 in an annular shape. Thus, the fixed core 29 is lightly press-fitted into the fifth hole 15, and the closed ends of the caulking recesses 30 and 30 are impacted and pressed inward, so that a part of the inner surface of the fifth hole 15 is covered. It will be crimped so that it may engage with the locking recesses 32, 32, whereby the fixed core 29 is fixed to the first yoke portion 6.

[0015]   A valve chamber 33 is formed in the first yoke portion 6 between the valve seat member 18 and the fixed core 29. The first yoke portion 6 in the valve chamber 33 has a ring coaxial with the fixed core 29. The guide member 34, which is shaped like a circle, is fixed. That is, the guide member 34 is of the first yoke portion 6. Lightly press-fitted into the fourth hole 14, and in that state, crimp the edge of the fourth hole 14 on the fifth hole 15 side. As a result, it is fixed to the first yoke portion 6. Therefore, the guide member 34 1 No chips are generated along with the fixing to the yoke portion 6.

[0016]   In addition, the guide member 34 has a hole 34a in order to avoid partitioning the inside of the valve chamber 33. Are drilled at a plurality of, for example, four locations spaced apart in the circumferential direction. Furthermore, the 1st yoke part 6 A communication passage 35 that communicates the valve chamber 33 with the annular groove 31 is formed in the.

[0017]   The end of the plunger guide 25 on the side of the second case member 5 contacts the inner surface of the magnetic cylinder 27. A stopper 37 having a bottomed cylindrical shape having a sealing member 36 on its outer surface is The stopper 37 is fitted so that the closed end is brought into contact with the second case member 5. A plurality of, for example, four grooves 38 are provided on the inner circumference so as to extend in the axial direction.

[0018]   Between the fixed core 29 and the stopper 37 in the plunger guide 25, a ferrous metal is used. A plunger 39 composed of a fixed core 29 and a plastic The plunger 39 is returned between the plungers 39 by urging the plunger 39 away from the fixed core 29. The spring 40 is contracted. In addition, between the plunger 39 and the stopper 37, a plastic The non-magnetic material for avoiding direct contact of the stopper 39 with the stopper 37 The ring-shaped spacer 41 is interposed.

[0019]   The plunger 39 has a valve shaft 42 with both ends thereof extending from both axial ends of the plunger 39. The valve shaft 42 is integrated so as to project, and the tip end portion (upper end portion in FIG. 1) of the valve shaft 42 is Slowly and coaxially penetrates the fixed core 29 and moves axially by the guide member 34. Is inserted into the valve chamber 33 in such a manner that the A spherical valve body 43 that can be seated on the seat member 18 and close the valve hole 17 is caulked and coupled. . The rear end of the valve shaft 42 is slidably fitted to the stopper 37. Moreover, the plan The jar 39 has a plurality of circulation holes 44 for circulating a fluid when it moves in the axial direction. It is drilled over the entire length in the axial direction.

[0020]   In such a normally open solenoid valve, the plunger 39 is demagnetized when the coil 24 is demagnetized. Is at a position separated from the fixed core 29 by the spring force of the return spring 40, and the valve body 43 Is in a valve open state in which the valve hole 17 is opened apart from the valve seat member 18. This valve open state When the coil 24 is excited by, the third yoke portion 19, the magnetic cylinder 27, the plunger 39, A magnetic flux passing through the fixed core 29, the first yoke portion 6 and the second yoke portion 7 is generated, and the plan The jar 39 is adsorbed to the fixed core 29 side, the valve body 43 is seated on the valve seat member 18, and the valve The hole 17 can be closed and a closed state can be obtained.

[0021]   In such a normally open solenoid valve, the fixed core 29 is attached to the first case member 4. The procedure for fixing in place will be described with reference to FIG.

[0022]   The plunger guide 25 is coupled to the first case member 4 and the guide member 3 4 is fixed, and between the plunger guide 25 and the second yoke portion 7, The coil 24 wound around the bin 23 and the third yoke portion 19 are fitted and inserted. So In the plunger guide 25, the fixed core 29, the ring-shaped temporary spacer 56, the tip A plunger 39 to which a valve shaft 42 having a valve body 43 at the end is coupled, a ring-shaped temporary The spacer 57, the spacer 41, and the stopper 37 are sequentially inserted, and the stopper 37 The second case member 5 is brought into contact with. In this way, the fixed core 29, the temporary spacer 5 6. Insert plunger 39, temporary spacer 57, spacer 41 and stopper 37. The front end of the first case member 4 in the closed state does not bend the thin portion 9 at the rear end. In this state, it is received by the fixed pedestal 60, and the pressing member 61 contacts the second case member 5. To be done.

[0023]   By the way, the temporary spacer 56 is used when the valve body 34 is seated on the valve seat member 18. Of the plunger 39 to avoid direct contact of the plunger 39 with the fixed core 29. And a thickness corresponding to the interval set between the fixed cores 29, The temporary spacer 57 has a valve closing position where the valve element 34 is seated on the valve seat member 18 and the valve element 34. The straw of the plunger 38 between the valve seat member 18 and the valve-opening position that is the farthest away from the valve seat member 18. The total thickness of the temporary spacers 56 and 57 is The fixed core 29 and the plastic in the valve open state in which the valve body 43 is separated from the valve seat member 18 It is equal to the air gap L between the injectors 39.

The pressing member 61 is pressed against the receiving table 60 side by a cylinder or the like (not shown). As a result, the second case member 5 presses the fixed core 29 via the stopper 37, the spacer 41, the temporary spacer 57, the plunger 39, and the temporary spacer 56, and the fixed core 29 causes the first yoke portion of the first case member 4 to move. Lightly press-fitted into the fifth hole 15 of No. 6. When the second case member 5 is pressed until it comes into contact with the step portion 8 at the rear end of the first case member 4, the pressing by the pressing member 61 is stopped and the pair of caulking recesses in the first case member 4 are pressed. A crimping jig 62 is inserted into each of 30, 30. The caulking jigs 62 are shock-pressed to the inner side of the first case member 4 so as to push the inner surface of the fifth hole 15 inward, and accordingly, the fifth hole 15 is pressed. A part of the inner surface of is fixed by caulking so as to engage with both locking recesses 32 and 32 provided in the fixed core 29, and the fixed core 29 is fixed to the first yoke portion 6. At this time, the stepped portion between the fourth hole 14 and the fifth hole 15 is formed so that a slight space L ₁ is formed between the fixed core 29 and the stepped portion between the fourth hole 14 and the fifth hole 15. The length to the end of the guide 25 and the axial total length of the fixed core 29, the temporary spacer 56, the plunger 39, the temporary spacer 56, the spacer 41, and the stopper 37 that are in contact with each other are set.

[0025]   After fixing the fixed core 29 to the first case member 4, the air gap L is adjusted to be constant. The work for adjustment is executed, and the procedure at that time is shown in FIG. 5 and FIG. This will be described with reference to FIG.

[0026]   In adjusting the air gap L to a constant value, the first case member 4 is fitted. The support block 45 for supporting and the second case member 5 on the step portion 8 of the first case member 4 The first and second case members 4 and 5 that are in a temporarily assembled state by abutting against each other are supported by the support block. A sandwiching member 46 for sandwiching between the lock 45 and the first case member 4, and a valve seat portion. When the press-fitting jig 47 for press-fitting the material 18 and the support block 45 are fitted, Is connected to the support block 45 so as to communicate with the communication passage 35 of the first case member 4. The vacuum pump 48 and the negative pressure change due to the stop of the fluid flow in the communication passage 35 should be detected. The vacuum pump 48 and the pressure detector 49 connected between the communication passage 35 are prepared. The holding member 46 is inserted into the holding member 46 and screwed into the support block 45. The plurality of bolts 65 are connected to the support block 45.

[0027]   On the outer surface of the first case member 4, a pair of annular grooves 31 are arranged so as to be located between them. The seal members 51 and 52 are fitted. On the other hand, the support block 45 has a first A stepped hole 53 is provided for fitting the base member 4 in a fixed axial position. And when the first case member 4 is fitted into the stepped hole 53, the first case member 4 Between the outer surface of the stepped hole 53 and the inner surface of the stepped hole 53. So that the annular passage 54 sealed by the ring members 51 and 52 communicates with the annular groove 31. Formed. Moreover, the support block 45 has a passage 55 communicating with the annular passage 54. A vacuum pump 48 and a pressure detector 49 are connected to the passage 55. It

[0028]   At this time, the plunger guide 25 is positioned at the fixed position of the first case member 4. The fixed core 29 that is fixed and the second case that is temporarily assembled to the first case member 4 The temporary spacer 56, the plunger 39, the temporary spacer 57, and the spacer The pacer 41 and the stopper 37 are interposed in this order.

[0029]   Here, the support block 45 is inserted coaxially with the first hole 11 of the first case member 4. A hole 64 is provided, and the press-fitting jig 47 pushes the insertion hole 64. The valve seat member 18 is then inserted. Moreover, one end of the press-fitting jig 47 is connected to the valve hole 17. A through hole 66, which is opened and the other end of which is made to pass through, is provided. A seal member 67 that is in sliding contact with the outer surface of the press-fitting jig 47 is fitted on the surface.

[0030]   By operating the vacuum pump 48, the flow hole 66 through the valve hole 17, the valve chamber 33, the communication passage 35, the annular groove 31, the annular passage 54 and the passage 55 to suck air. Meanwhile, the valve seat member 18 is press-fitted into the first hole 11 by the press-fitting jig 47. To be so Then, the flow of air is allowed until the valve body 43 is seated on the valve seat member 18. Therefore, the pressure detected by the pressure detector 49 does not change significantly, but the valve body 43 is When seated on 18, the flow of air is cut off and the pressure detected by the pressure detector 49 is detected. A big change occurs. Therefore, the press fitting of the valve seat member 18 by the press fitting jig 47 is stopped. By doing so, the valve seat member 18 is fixed to the first yoke portion 6 of the first case member 4. The fixed position is determined, and the axial position of the plunger 39 in the valve closed state is determined.

[0031]   Next, the bolt 65 is loosened to remove the holding member 46, and the first and second case members are removed. 4 and 5 are separated from each other, and the temporary spacer 56 and the plunge are removed from the plunger guide 25. The temporary spacer 39, the temporary spacer 57, the spacer 41 and the stopper 37, and After separating the spacers 56 and 57, the return spring 40, the plunger 39, the spacer 41 and And the stopper 37 are again inserted into the plunger guide 25, and the step of the first case member 4 is By bringing the second case member 5 into contact with the part 8 and caulking the thin part 9, Finally, the casing C is assembled by connecting the members 4 and 5 to each other, and the normally open solenoid The assembly of the valve is completed.

[0032]   In the normally open solenoid valve thus assembled, the coil 24 was demagnetized. In the valve open state, the air gap L between the fixed core 29 and the plunger 39 is The value corresponds to the total thickness of the pacers 56 and 57, and the air gap is always constant. Lp can be obtained.

[0033]   Next, the operation of this embodiment will be described. From the direction orthogonal to the axis in the lightly press-fitted state into the fifth hole 15 in the first yoke portion 6, The first yoke portion 6 is caulked and fixed to the first yoke portion 6, and the fixed core 29 is fixed. No chips are generated at a fixed time, and therefore when the normally open solenoid valve is closed. Does not exist between the valve body 43 and the valve seat member 18 and a reliable closed valve state is obtained. You can In addition, even if the axial pressure acts on the fixed core 29, the fixed core 29 The axial movement of the fixed core 29 is reliably prevented by reliably preventing it from moving in the axial direction. Can have.

[0034]   Further, a plurality of, for example, a pair of combs are provided on the first yoke portion 6 formed in a thick cylindrical shape. Providing the recesses 30, 30 for insertion, and inserting the caulking jig 62 into the recesses 30, 30. Since it has been crimped, the strength of the first yoke portion 60 is not greatly impaired, It is possible to crimp a part of the thick first yoke portion 6 inward in the radial direction. Become.

[0035]   In the above-mentioned embodiment, the locking recesses 32 are formed in an annular shape, but at positions spaced apart in the circumferential direction. The locking recess 32 may be provided in the. Further, the present invention is a normally open type of the above embodiment. Not only solenoid valves but also normally closed solenoid valves are applicable. Widely applicable to solenoid valves in which the fixed core is fixed to the single is there.

[0036]

[Effect of device]

  As described above, according to the first aspect of the present invention, the locking recess is provided on the outer surface of the fixed core. And a part of the inner surface of the hole of the casing has a radius with the fixed core fitted. As it is caulkedly engaged with the locking recess according to the inward pressure in the direction, the generation of chips is prevented. In addition to being prevented, the axial movement of the fixed core can be reliably prevented.

[0037]   According to a second feature of the present invention, a plurality of positions spaced in the circumferential direction of the casing are provided. Insert a jig that presses a part of the inner surface of the hole corresponding to the locking recess inward in the radial direction. A caulking recess is provided on the outer surface of the casing so that it can be inserted and the inner end is closed. Therefore, even if the portion of the casing that corresponds to the fixed core is thick, The caulking inward in the radial direction is possible without significantly impairing the degree.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a normally open solenoid valve taken along line 1-1 of FIG.

FIG. 2 is an enlarged view of part 2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a vertical cross-sectional view showing a fixed core fixed.

FIG. 5 is a vertical cross-sectional side view showing the time of adjusting the air gap.

6 is an enlarged cross-sectional view of a main part of FIG.

[Explanation of symbols]

15 ... hole 29 ... Fixed core 30 ... Recess for caulking 32 ... Locking recess 62 ... Jig C ・ ・ ・ ・ ・ ・ Casing

Claims (2)

[Scope of utility model registration request] 1. A casing (C) made of a magnetic material,
In a solenoid valve in which a fixed core (29) is fixed in a state of being fitted in a hole (15) provided in the casing (C), a locking recess (32) is provided on an outer surface of the fixed core (29), A part of the inner surface of the hole (15) of the casing (C) is caulked in the locking recess (32) in response to a pressure inward in the radial direction with the fixed core (29) fitted. Solenoid valve characterized by being combined. 2. Holes (1) corresponding to the locking recesses (32) are provided at a plurality of positions spaced apart in the circumferential direction of the casing (C).
A jig (6) for pressing a part of the inner surface of 5) inward in the radial direction.
2) can be inserted and the inner end is closed, and the caulking recess (3
2. The solenoid valve according to claim 1, wherein 0) is provided so as to open on the outer surface of the casing (C).