KR910008348Y1 - Solenoid - Google Patents

Abstract

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Description

Solenoid

1 is a longitudinal sectional view of a solenoid showing an embodiment of the present invention.

2 is a front view of the same.

3 is a plan view of the same.

4 is a side (partially cut out) view along the line A-A of FIG.

5 is a cross-sectional view taken along the line B-B in FIG.

6 is a connection diagram.

7 is a longitudinal sectional view of a solenoid showing another embodiment of the present invention.

8 is a front view.

9 is a plan view of the same.

FIG. 10 is a side (partially cutaway) view taken along line C-C of FIG.

FIG. 11 is a cross-sectional view taken along the line C-D of FIG.

* Explanation of symbols for main parts of the drawings

1 bobbin 2 through hole

2a: one end 2b: the other end

3: coil 3a: suction coil

3b: Retention Coil 4: Fittings

8: fixed iron core 9: sealing material

100: plunger 10a: plunger body

10b: Rod 13: Ring

17: protruding end 30: housing

31: Lost 32a: End wall

35: 0-ring 36: sealing

55: variable volume chamber 56: hole

57: diaphragm 58: viscous liquid

60: solenoid 70: solenoid

71: air chamber 72: synthetic resin plate

73: hole

The present invention relates to a solenoid.

In general, the solenoid has a high impact sound when the plunger collides with the fixed iron core during adsorption of the plunger. Especially, when the solenoid is used in a device used in a house such as a fully automatic washing machine, the impact sound is unpleasant. It is hoped.

Conventionally, in order to reduce this collision sound, a piston rod penetrating the bottom of the fixed iron core is provided at the front end of the movable core of the solenoid, for example, as Japanese laboratory 55-52649. It is proposed to fix a linear air air damper piston ring attached to the piston rod.

However, since the air damper operates only during the suction operation of the movable core, the conventional configuration described above reduces the impact sound on the fixed core of the movable core, but the controlled member connected to the plunger when the coil is disconnected and the movable core protrudes. The collision sound of the side is not reduced at all.

In addition, the movable core is applied to the front end of the elongated thin piston rod as a form in which the damping force of the air damper opposes the suction force acting on the movable core, so that the movable core easily vibrates from side to side during braking, which is why Abrasion of bobbin which generate | occur | produced and the sliding joint of a movable iron core was also severe.

In addition, DC solenoids generally rectify AC and use it as a power source, but the suction force of the moving core is severely pulsated according to this rectified waveform, so that the moving core is connected to a controlled member (for a fully automatic washing machine: The brake lever, the valve entity of the drain valve, and the connecting rod connecting the plunger) vibrate with the movable core to generate a large buzzer sound, which is generated continuously during the suction operation time. As a result, when the suction operation time was prolonged, the buzzer sound became extremely uncomfortable, and it could hardly be provided as a solenoid used in the house.

The present invention is to solve the above-mentioned problems, and to provide a solenoid capable of achieving a reduction in the operation noise during suction operation and protrusion operation.

The solenoid of the first proposal of the present application includes a bobbin having a through hole wound around the coil, a fitting surrounding the electric bobbin, and a part inserted into the through hole electricly transmitted from one end of the through hole. The housing, which uses the middle part of the plunger, and has an oil chamber opened toward the through hole, is attached to the electric fitting, and the plunger is connected to the end wall of the electric housing through which the electric plunger passes. In addition to the sealing installation for sliding, a variable volume chamber for attaching a sealing material for sealing the through hole is attached to the other end of the above-mentioned through hole, and in the housing to communicate with the oil chamber. And a viscous liquid is filled in the lost oil and the electrical through hole.

In addition, the second proposal of the present application is that the solenoid has a bobbin having a through-hole wound around the coil, a fitting surrounding the electric bobbin, and a part of the through-hole from one end of the through-hole. In a solenoid having an inserted plunger, the housing which receives the intermediate part of the plunger and holds the oil chamber opened toward the through hole which has been inserted, is attached to the electric fitting, and the end of the electric housing through which the electric plunger penetrates. A sealing ring is provided for sliding to the plunger, which is attached to the wall, and the other end of the through hole and the sealing material for sealing the through hole are attached. The housing is placed above the oil chamber. An air chamber communicating with the oil chamber is provided, and the solenoid is filled with a viscous liquid in the oil chamber and the through hole. It's id.

In the solenoid of the present invention, during the suction operation of the plunger, the viscous liquid in the through hole of the bobbin flows out of the gap between the through hole and the plunger into the oil chamber, and the viscosity is generated in the through hole according to the flow resistance. Liquid pressure is applied to the front end of the plunger to brake the plunger.

In the plunger protruding operation, the viscous liquid in the oil chamber flows into the through hole from the gap between the through hole and the plunger, and the plunger is caused by the negative pressure of the viscous liquid generated in the through hole depending on the flow resistance. Is braked.

Since the braking force to the plunger is applied to the front end of the plunger, the yellow vibration of the plunger is small, and further, the yellow vibration is suppressed by the viscous liquid between the plunger and the through hole.

In addition, even if the suction force of the plunger is pulsated by the waveform of the voltage applied to the coil, since the end of the plunger is also suppressed by the viscous liquid, the occurrence of the buzzer is suppressed in a small amount in the control member material connected to the plunger.

With the suction and protrusion operation of the plunger, the effective volume obtained by subtracting the volume of the plunger from the total volume of the loss and through-holes varies, but in the first draft, the amount of viscous oil accompanying this fluctuation flows into the variable volume chamber. The plunger is smoothly reciprocated without being locked, since it is supplied (in the plunger suction operation) or supplied from the variable volume chamber into the oil chamber (in the plunger protruding operation).

In the second draft, the viscous liquid, which is excluded by the plunger entering the oil chamber during the plunger suction operation, flows into the air chamber while compressing the air in the air chamber, and flows into the electrical chamber during the plunger protrusion operation. Since one viscous liquid is supplied into the oil chamber on the contrary, the plunger is smoothly reciprocated without being locked.

In addition, the pressure increase in the air chamber accompanied by the aforementioned compression can be suppressed in small amounts by setting the air volume of the air chamber large with respect to the plunge volume (section area x stroke) of the portion entering and exiting the oil chamber. In addition, it can have little effect on the operation of the plunger.

On the contrary, since it is supplied into the oil chamber, the plunger is smoothly reciprocated without being locked.

The increase in pressure in the air chamber accompanied by the aforementioned compression can be suppressed in small amounts by setting the air volume of the air chamber large with respect to the plunger volume (section area x stroke) of the portion entering and exiting the oil chamber. It can also have little effect on the operation of the plunger.

An embodiment of the first draft will be described below with reference to FIGS. 1 to 6.

In the figure, reference numeral 1 denotes a bobbin having a through hole 2, in which a coil 3 made of a suction coil 3a and a holding coil 3b connected in series therewith is wound on the outside.

(4) is a fitting surrounding the coil (3), the frame (4a) is formed of a magnetic material plate bent to the shape of?] And the magnetic is fixed to the frame (4a) by a caulking joint (5) It consists of the cover 4b of material board.

Between the fitting 4 and the outer circumferential portion of the bobbin 1 on which the coil 3 is wound, a mold resin group is injected and solidified to form the resin layer 6.

(7) is a 0-ring provided between the lid 4b and the flange portion of the bobbin 1, and is for sealing between the lid 4b and the bobbin 1, but the seal of the resin layer 6 If the surname is sufficient, it may be omitted.

(8) is inserted into the through hole (2) is a fixed iron core protrudingly attached to the frame (4a), (9) is a zero ring sealing between the through hole (2) and the fixed iron core (8) It is a seal system.

Part 10 is inserted into the through-hole 2 from one end portion 2a of the through-hole 2, and the insertion-side end portion 11 joins the fixed core 8 and is free to fall off. For example, the plunger main body 10a to be fitted with a slight gap (for example, 0.3 mm on one side) in the through hole 2 and the rod 10b connected to the plunger main body 10a by the pin 12. )

13 is a ring made of a magnetic material, which is inserted into a small diameter portion 14 of the plunger body 10a, and the pin 12 and the shoulder portion 15 of the plunger body 10a. The gap between the ring 13 and the lid 4b was formed during adsorption of the plunger.

(16) is a uniaxial connection body with a collar attached by a pin (18) to the protruding end (17) of the plunger (10), the collar portion being a disk-shaped pressing plate ( 19).

Reference numeral 20 denotes a hole drilled in the connecting member 16, which is a hole for connecting a controlled member (not shown) driven by the plunger 10. As shown in FIG.

In addition, 21 is a plastic cover which coat | covered the fitting 4.

On the other hand, (30) is made of a plastic and the housing, by covering the cover 33 to the housing body 32 having the oil chamber 31, which is a cylindrical space.

The housing body 32 is attached to the leg portion 4c of the fitting 4 by fastening with a screw 34, and the oil chamber 31 is opened toward the through hole 2 of the bobbin 1, It communicates with the through-hole 2.

The outer circumference of the ring 13 fixed to the plunger 10 is fitted to the inner wall surface of the oil chamber 31 with a slight gap (for example, 0.5 mm).

Reference numeral 35 is a 0-ring that seals between the lid 4b and the housing body 32.

Reference numeral 36 is a seal ring made of an oil seal, and is attached to the end wall 32a of the housing body 32 through which the rod 10b passes.

The cover 33 is fastened with a screw 37 to be attached to the housing main body 32, and the cavity 33, 38, 39 between the cover 33 and the housing main body 32 are provided. ) Is formed.

40 is a two-piece support piece made of an elastic metal fixed to the housing body 32, and a movable contact 41 is fixed to the front end thereof, and the proximal end thereof is a cavity port 39. It is connected to the lead wire 42 inside.

In addition, reference numeral 43 denotes a holding plate made of a metal plate fixed to the housing main body 32, and fixed fixing members 44 are fixed to the movable contacts 41 described above, and these contacts 41, 44 are fixed. ) Is formed in the switching contact 45.

This switching contact 45 is connected in parallel to the coil 3b, as shown in FIG.

A lead wire 46 is connected to the holding plate 43, and the lead wire 46 and the lead wire 42 on the movable contact 41 side are fixed to the bobbin 1, and the holding coil 3b of It is connected to each terminal 47 and 48 connected to both ends, respectively.

In addition, 49 and 50 are terminals connected to the ends of the suction coils 3a and the coil 3b, and are fixed to the bobbin 1.

In addition, 51 is a pressurized bar made of a stepped uniaxial insulating material, one end of which is opposed to the pressing plate 19 and the other of which is opposite to the middle of the support piece 40, and the housing body 32. The sliding motion is freely fitted into the stepped through-hole 52 drilled through the cover 33.

At the front-end | tip of the large diameter part of the press bar 51, it is provided in the protrusion 53 with a small diameter, and this protrusion is fitted in the small hole drilled in the support piece 40. As shown in FIG.

Reference numeral 55 denotes a variable volume chamber provided in the housing main body 32. An opening is formed in a short cylindrical upper space communicating with the oil chamber 31 via a hole 56, and a diaphragm made of an elastic material such as rubber. (57) is covered with a seal.

Reference numeral 58 is a viscous liquid such as silicone oil, and is filled in the oil chamber 31 and the through-hole 2 and a part of the variable volume chamber 55.

The residual air 59 in the variable red chamber 55 is preferably small. However, the residual air 59 is a quantity such that air does not enter the through hole 2 due to reciprocation of the plunger 10. 58) may exist.

In the solenoid 60 of the above-described configuration, the plunger 10 is in the position shown in the case of coil disconnection, and the pressing plate 19 is in a position away from the cover 33 together with the rod 10b. The changeover welding point 45 is closed.

When power is supplied from the DC power supply rectified to the terminals 49 and 50, the holding coil 3b is short-circuited at the switching contact 45, so that a large current flows into the suction coil 3a. The plunger body 10a is sucked in the direction of the arrow X and enters the through hole 2.

With this entry, the plunger body 10a receives the braking force by the viscous liquid 58 in the through hole 2, and furthermore, the ring 13 also receives the braking force by the viscous liquid 58 in the oil chamber 31. The plunger 10 impinges on the fixed core 8 at a relatively low speed.

The seal member 9 prevents oil leakage at the other end portion 2b of the through hole 2.

At the end of the suction stroke of the plunger 10, the pressing plate 19 presses the pressure bar 51, thereby opening to the switching welding point 45, which is connected in series with the suction coil 3a. A small current flows to the holding coil 3b to switch to the holding state.

On the other hand, since the gap between the ring 13 and the lid 4b is also small at the end of the suction stroke, the ring 13 is sucked hard by the lid 4b, and the plunger 10 is held in the holding state by the addition of the suction force. Is kept exactly at the adsorption position.

Although the plunger 10 which cuts off the coil 3 is driven in the protruding direction by the tension force from the controlled member, the viscous liquid 58 must flow into the through hole 2 with this protruding operation. Since the plunger body 10a is braked by the viscous liquid 58 and is also braked by the viscous liquid 58 in the ring 13 and the oil chamber 31, the plunger 10 protrudes at a relatively low speed and is avoided. The collision sound on the control member side is small.

The seal ring 36 prevents oil leakage at the rod through portion of the end wall 32a.

In response to the protruding of the plunger 10, the switching welding point 45 returns to the closed state due to the elastic force of the support piece 40 in the opposite operation.

The buzzer sound during operation of the plunger 10 is also reduced by the viscous force of the viscous liquid 57.

In the plunger suction operation described above, the viscous liquid 58 corresponding to the volume (rod cross-sectional area X stroke) of the rod 10b entering the oil chamber 31 flows into the variable volume chamber 55 through the hole 56. At this time, the diaphragm 57 is elastically deformed outward to increase the volume of the variable volume chamber 55 to accommodate the inflow and outflow.

In the plunger protruding operation, the inflow liquid is sucked back into the oil chamber 31 and the diaphragm 57 is elastically deformed inward to reduce the volume of the variable volume chamber 55.

By the volume change action of the variable volume chamber 55, the plunger 10 is smoothly reciprocated without being locked.

The solenoid 60 having the above-described configuration (however, the plunger stroke = 15 mm) is installed in the fully automatic washing machine, and when the silicone oil is used as the viscous liquid 58, this silicone oil is contained in the oil chamber 31 and the through hole (2). The operation test was conducted by repeating the energization disconnection of the coil 3 for both of the cases where the diaphragm 57 was removed and the diaphragm 57 was removed. In the former case, the suction and protrusion operation times were 0.6 seconds and the noise was In the latter case, the suction and protrusion operating times were 0.04 seconds and the noise was 72 phones at maximum.

Next, an embodiment of the second draft will be described with reference to FIGS. 7 to 11.

In these drawings, the same reference numerals as those in FIGS. 1 to 6 or the same parts as those in FIGS. In this embodiment, the point where the air chamber 71 is provided instead of the variable volume chamber 55 mentioned above differs from the embodiment mentioned above.

In other words, an upper portion of the oil chamber 31 of the housing main body 32 is sealed with a synthetic resin plate 72 to close the opening of the short cylindrical space, and a sealed air chamber 71 in which air is sealed is provided.

The synthetic resin plate 72 is ultrasonically welded to the stepped portion 32b of the housing body 32 around the entire circumference of the peripheral portion, and its flexibility in the vertical direction is small.

In addition, the air chamber 71 communicates with the oil chamber 31 by a hole 73 provided at the bottom thereof, and at least a viscous liquid 58 such that the hole 73 is not exposed when the plunger 10 protrudes. ) Is filled in a part of the air chamber 71.

As shown in FIG. 7, the cover 33 is enlarged to cover the lead wires 42 and 46 connected to the terminals 47 and 48 protruding forward of the bobbin 1. In addition to accommodating the inside of the cover 33, the guide 74 is fixedly installed.

Then, the connector 16 and the plunger are fitted into the guide plate 74a, which is formed by drilling the pin 75 protruded and fixed to the pressing plate 19 of the connector 16 and installed in the guide 74. 10) was stopped.

Furthermore, as shown in FIG. 10 and FIG. 11, the cavity part 38 provided between the housing main body 32 and the cover 33 is installed in the up-down direction to the side of the plunger 10, and this cavity part 38 is shown. The cavity 39 is provided below, and the support piece 40 is arranged in the vertical direction, and the movable contact 41 and the fixed contact 44 are provided above the center of the plunger 10.

Reference numeral 76 denotes a support block for holding the base of the support piece 40, and is fixed to the housing main body 32 and integrated with the housing main body.

Reference numeral 77 denotes a cover inserted into the contact portion checking window 78.

Besides, there are some modifications in the shape of the cover 21, the shape of the frame 4a attaching leg, and the like, and the configuration of the coil 3 is the same as that in FIG.

Also in the solenoid 70 of the above-described configuration, the plunger (during the suction operation and the protruding operation) is subjected to the same braking force as in the embodiment described above by the viscous liquid 58 filled in the oil chamber 31 and the through hole 2. The collision sound and the buzzer sound of 10) are reduced.

In the plunger suction operation, the viscous liquid 58 corresponding to the volume (rod cross-sectional area X stroke) of the rod 10b entering the oil chamber 31 is removed from the oil chamber 31 and passes through the air chamber 73 through the hole 73. It flows in into 71, and the air in this air chamber 71 is compressed.

In the plunger protruding operation, the introduced viscous liquid 58 returns into the oil chamber 31.

Due to the volume change of the air in the air chamber 71, the plunger 10 is smoothly reciprocated without being locked.

In addition, the synthetic resin plate 72 is slightly deformed up and down in accordance with the pressure change of the air in the air chamber 71.

In this embodiment, since the movable contact 41 and the stationary contact 44 are provided at a position above the center of the plunger 10, the movable contact 41 and the fixed contact 44 are soaked out from the sealing ring 36 of the plunger 10 and fall out to the outside. (58) has the advantage that there is no fear of causing poor conduction adhered to these contact portions.

The present invention is not limited to each of the above-described embodiments. For example, the plunger 10 may be integrated without being divided into two, and the variable volume chamber 55 may be replaced by a spring instead of the diaphragm 57. An elastically supported reciprocating piston may be inserted into the opening of the variable volume chamber 55.

Instead of the synthetic resin board 72, the air chamber 71 may be sealed and sealed with a hard and high rigid material.

In each of the above embodiments, the ring 13 attached to the plunger 10 is fitted to the inner wall surface of the housing main body 32 with a slight gap, and the resistance of the viscous liquid 58 acting on the ring 13. Since the braking force is used for braking of the FIG. The clearance gap with may be enlarged.

In addition, as the opening and closing mechanism of the switching welding point 45, it is possible to use other than the above. Moreover, the present invention is widely used for various solenoids such as solenoids without coil switching or solenoids without using the ring 13 for increasing the holding force. It applies.

As described above, according to the present invention, both the impact sound and the buzzer sound are simultaneously reduced in both the suction operation and the projecting operation of the plunger, and a useful solenoid that can achieve low noise and also reduce the accompanying wear of the plunger. Is obtained.

Claims (3)

The bobbin 1 which holds the through-hole 2 in which the coil 3 was submerged, the fitting 4 surrounding the bobbin 1 which were mentioned, and the one end part 2a of the through-hole 2 mentioned above. A solenoid having a plunger 10 having a portion inserted into the through hole 2, which is inserted from the through hole 2), wherein the lost portion accommodates the intermediate portion of the plunger 10 that is described above and opens toward the through hole 2. To the plunger 10 which is attached to the fitting 4 which attached the housing | casing 30 which hold | maintains 31, and to the end wall part 32a of the electrical housing 30 which the said plunger 10 penetrates. The sealing ring 36 for sliding is provided, and the sealing material 9 for sealing the through hole 2 is attached to the other end portion 2b of the through hole 2 described above, and the housing is provided. The variable volume chamber 55 communicating with the oil chamber 31 is provided in the 30, and the viscous liquid 58 is filled in the oil chamber 31 and the through-holes 2, which are described above. The solenoid. The variable volume chamber 55 communicating with the oil chamber 31 described above is disposed above the oil chamber 31, and is an air chamber 71 in communication with the oil chamber 31. Solenoid. The magnetic material ring 13 of claim 1 or 2 is attached to the inner wall surface of the housing 30, which has been inserted in the middle portion of the plunger 10, with a slight gap therebetween, and the plunger 10 A solenoid, characterized in that the ring (13) provided at the time of adsorption is opposed to the fitting (4) with a small gap therebetween.