CN1734900A - Linear actuator and pump device and compressor device therewith - Google Patents

Abstract

To provide a linear actuator that prevents a magnet from being separated even if a moving body is driven under severe conditions, that causes no abnormal noise, no deterioration of performance, and that prevents the separated magnet from contacting stacked cores to avoid damage to the moving body, and also provide a pump device and a compressor using the linear actuator. The linear actuator 1 comprises outer yokes 4 that form a first space 6 and a second space 7 between the inner yokes 3 and themselves, and a movable body 5 having magnets 9 inside the spaces 6, 7. The outer yokes 4 and the inner yokes 3 are arranged in plural number in the circumferential direction. The moving body 5 is provided with magnets 9 each arranged between the inner yokes 3 and the outer yokes 4 and has magnet-holding portions 52 of a resin that each hold a magnet 9 with its both ends embedded, between adjacent magnets 9. At the magnet-holding portions 52, the magnets 9 have a protruding portion 91 that overlaps the resin in the axial direction.

Description

Linear actuator, the pump unit that uses it and compressor set thereof

Technical field

The present invention relates to linear actuator, use its pump unit and compressor set thereof.

Background technology

In the past, piston carries out such pump unit of rectilinear motion and compressor set in cylinder, linear actuator by the body that forms cylinder, driven plunger constitutes, as drive division with linear actuator, do back and forth to drive and use linear motor (for example, with reference to patent documentation 1) at axis direction in order to make piston.

[patent documentation 1] Japan Patent spy opens the 2000-337725 communique

With the occasion of this linear actuator as the drive source of pump unit and compressor set, the ambient temperature when work rises under the environment about 80 ℃, and movable body is driven with amplitude 4～8mm, driving frequency 60～80Hz.This occasion, under harsh environment, the stress that direction of vibration is constantly arranged is in inserting on the fixing permanent magnet group 18 of shaping or bonding, so permanent magnet group 18 might be peeled off from resin bed.When permanent magnet group 18 when resin bed is peeled off, will produce abnormal sound and decreased performance, under the serious situation, the permanent magnet group 18 after peeling off contacts with la m laminated core 24 or outside layer laminated core 19, has the problem of movable body breakage.

Summary of the invention

Therefore, the objective of the invention is to, also can not peel off, can not produce abnormal sound, decreased performance from resin bed and can not contact the linear actuator that makes the movable body breakage, the pump unit that uses it and compressor set thereof with la m laminated core or outside layer laminated core driving movable body, magnet under the harsh condition because of the magnet after peeling off even provide a kind of.

In order to address the above problem, linear actuator of the present invention comprises: interior yoke; With with this in be formed on the 1st gap that axis direction separates and the 2nd gap between the outer peripheral face of yoke form be provided in yoke in this around outer yoke; By with described outer yoke, described the 1st gap, described in yoke, described the 2nd gap, and described outer yoke as magnetic circuit in described the 1st gap and the drive division that constitutes of the coil of described the 2nd gap generation alternating magnetic field; In described yoke and described outside have magnet between the yoke, and the movable body that is back and forth driven towards axis direction linkedly with described alternating magnetic field, it is characterized in that, described outer yoke and described interior yoke dispose a plurality of with opposite face separately in a circumferential direction, described movable body, has a plurality of described magnet that is configured in respectively between described interior yoke and the described outer yoke, and between adjacent described magnet, has the magnet maintaining part that constitutes by resin of the two ends of described magnet being buried underground maintenance, in described magnet maintaining part, described magnet has overlapping portion overlapping with described resin on axis direction.

In the present invention, described magnet maintaining part, preferably at least a portion enters between the adjacent described interior yoke, reaches between the adjacent described outer yoke.So structure can constitute the magnet maintaining part significantly, can guarantee rigidity.And, be wasted space between adjacent interior yoke and the adjacent outer yoke, so need not maximizing, linear actuator gets final product.

Among the present invention, described overlapping preferably is made of the protuberance of giving prominence to towards the direction of intersecting with axis direction.As long as protuberance is outstanding towards the direction of intersecting with axis direction, from the surface or the side vertical of thickness direction with thickness direction, and no matter can from where giving prominence to.

Among the present invention, described magnet is square thin plate, and described overlapping preferably is made of the protuberance outstanding from adjacent described magnet opposite face each other towards adjacent described magnet direction.So constitute, can constitute the good overlapping portion of balance from intensity and the aspect of saving the space.And, can use simple upper and lower mould as the mould that forms magnet.

Among the present invention, described overlapping portion also can be made of the intercommunicating pore of 2 faces of the thickness direction that is communicated with described magnet.

As described above, the two ends of magnet are being buried underground in the magnet maintaining part of maintenance, magnet has overlapping portion overlapping with resin on axis direction.Therefore, be overlapping portion overlapping on the axis direction by direction of vibration with resin at movable body, can bear the stress of direction of vibration.Magnet like this, except the cohesive force of magnet and resin, physically also bears the stress of direction of vibration, so even drive movable body under harsh condition, can not peeled off from resin bed yet.Therefore, can prevent the generation, performance decrease of abnormal sound and contact the problem that makes the movable body breakage with interior yoke or outer yoke because of the magnet after peeling off.

Description of drawings

Fig. 1 (A), (B) represent to have used the longitudinal sectional view and the X-Y transverse sectional view of the major part of linear actuator of the present invention respectively.

The part that Fig. 2 (A), (B) represent to have used linear actuator of the present invention is respectively dissectd the stereogram seen from oblique upper the back, and the part of movable body is dissectd the stereogram that the back is seen from oblique below.

Fig. 3 is the longitudinal sectional view after major part that linear actuator of the present invention has been used in expression is amplified.

Coil rack, coil rack and the outer yoke that uses in the linear actuator of the present invention, the key diagram that reaches the holding section of coil rack and outer yoke have been used in Fig. 4 (A), (B), (C) expression.

The exploded perspective view of each member of Fig. 5 is the application seen from oblique upper formation linear actuator of the present invention.

Fig. 6 (A), (B) represent the key diagram of the action of this linear actuator respectively.

Fig. 7 (A), (B) are the vertical views that other magnet that use in the linear actuator of the present invention have been used in expression.

Fig. 8 is the cutaway view that air pump device of the present invention has been used in expression.

Embodiment

Below, describe having used linear actuator of the present invention with reference to accompanying drawing.

(overall structure)

Fig. 1 (A), (B) represent to have used the longitudinal sectional view and the X-Y transverse sectional view of the major part of linear actuator of the present invention respectively.Fig. 2 (A), (B) represent to have used the part of linear actuator of the present invention respectively and dissect the stereogram that the back is seen from oblique upper, and the part of movable body is dissectd the stereogram that the back is seen from oblique below.Fig. 3 is the longitudinal sectional view after major part that linear actuator of the present invention has been used in expression is amplified.

In Fig. 1 (A), (B) and Fig. 2 (A), the linear actuator 1 of this form is used to supply with pump unit that various fluids use or compressor set etc., by having drive division 87 from the framework 2 of axis direction clamping stator side, can constituting along the movable body 5 that axis L moves back and forth with respect to this drive division 87.

As shown in Figure 1, in drive division 87, in the support 22 of framework 2, form cylindrical portion 16, one ends cylindraceous and be fixed on the upper end that interior yoke 3 on the maintenance body 17 that forms ring-type is fixed in this cylindrical portion 16.Interior yoke 3 is the state after the equal angles compartment of terrain has disposed 8 in a circumferential direction.Interior yoke 3 has tabular, all becomes the plane with opposite face (outside) and the back side (inboard) thereof of outer yoke 4 described later.

Between the pair of brackets 21,22 as framework 2, yoke 4 is installed 8 at circumferencial direction by equal angles compartment of terrain, gap 86 (with reference to Fig. 1 (B)) outside the bulk that constitutes the configuration of 6,7 ground, the 1st and the 2nd gap on axis direction on the position that the opposite face by interior yoke 3 separates.Here, outer yoke 4 becomes the plane with the opposite face of interior yoke 3.Interior yoke 3 roughly separates 3mm and parallel formation with the plane opposite face that forms mutually of outer yoke 4.

Outer yoke 4 is that 2 the outer yoke member 41,42 up and down of U font constitutes by the longitudinal cross-section.Outside each in yoke 41,42, side becomes by the 1st and the 2nd relative relative part 410,420 of the 1st and the 2nd gap 6,7 and interior yoke 3 towards the part of axis direction bending within it. End 419 and 429 butts in its outside towards the part of axis direction bending.2 outer yoke members 41,42 all are with the multi-disc magnetic sheet so that the stacked blocks that makes under the situation that its end face erects towards the form of the direction of interior yoke 3.Therefore, has the less advantage of eddy current losses in the outer yoke 4.

In addition, outside in the yoke 4, the coil 8 with flat shape of ring-type is wound on the coil rack 80 and is configured in the space that constitutes between 2 outer yoke members 41,42.The outside of coil 8 is covered by resinous cover plate 89.Here, coil 8 is the shared coils of reeling with the form that covers 8 outer yoke 4 integral body.Towards the axis direction bending, front becomes above-mentioned relative portion 410,420 to outer yoke member 41,42 from the part of the outer circumferential side that is positioned at each coil 8 all within it sides of both ends of the surface by the axis direction of coil 8.

With respect to the drive division 87 of formation like this, in this form, dispose the movable body 5 of Fig. 2, cup-shaped shown in Figure 5.This movable body 5 is a resin molded part, shown in Fig. 2 (B), comprising: the bottom 51 of positive 8 dihedrals, the elongated magnet maintaining part 52 that erects towards axis direction from the angle part of this bottom 51, the side wall portion 55 that the side of adjacent magnet maintaining part 52 is sealed.The occasion of this form, the side of all magnet maintaining parts 52 constitutes tubular by side wall portion 55 sealings.

Side wall portion 55,51 sides are along open distolateral from the bottom, make resin wall 53, magnet 9, resin wall 54 integrally formed.That is, movable body 5 forms magnet 9 and inserts the resin molded part that forms.And magnet maintaining part 52 adds up to formation 8 places, and 8 magnet 9 keep the equal angles compartment of terrain in a circumferential direction.Magnet 9 is the roughly tabular of 2mm of thickness, and two faces of thickness direction become the plane and expose towards the outside, becomes with the opposite face (outside) of outer yoke 4, reaches and the opposite face (inboard) of interior yoke 3.Two opposite faces that the interior outside of resin wall 53 and resin wall 54 forms with magnet 9 become same plane respectively.

Here, magnet 9 is rare earth element magnets of Nd-Fe-B system, or resin magnet, and the surface and the back side excitation respectively are the opposite utmost point, and its flat shape forms rectangle.Be the flat board that 2 faces of thickness direction form parallel plane, on adjacent magnet 9 opposite face each other, respectively form 4 protuberances 91 towards the overlapping portion of conduct that adjacent magnet 9 directions form highlightedly.

In addition, shown in Fig. 1 (B), magnet maintaining part 52 is the flat shape of general triangular when axis direction is seen, the part wedge-like ground that is equivalent to vertex of a triangle embeds between the adjacent interior yoke 3, and the part suitable with leg-of-mutton base enters between the adjacent outer yoke 4.

Shown in Fig. 1 (A), be configured in drive division 87 sides by the movable body 5 that will so constitute, 8 magnet 9 are laid respectively in the 1st and the 2nd gap 6,7 of interior yoke 3 and outer yoke 4.The occasion of this form, 8 magnet 9 in being provided between yoke 3 and the outer yoke 4 are all than outer yoke 4 more approaching interior yoke 3 ground configurations.That is, the opposite face of interior yoke 3 and the magnet 9 relative with yoke 3 in this be set to 0.4mm apart from d (with reference to Fig. 3), and the distance D (with reference to Fig. 3) of the opposite face of outer yoke 4 and the magnet 9 relative with this outer yoke 4 is set to 0.6mm.

(snap-in structure of coil rack and outer yoke)

Coil rack, coil rack and the outer yoke that uses in the linear actuator of the present invention, the key diagram that reaches the holding section of coil rack and outer yoke have been used in Fig. 4 (A), (B), (C) expression.

In the linear actuator 1 of this form, coil rack 80 is made of the tube portion 81 of tubular, the flange part 85 that extends towards foreign side radially from the two ends of tube portion 81, guarantees coil 8 and the 1st relative part 410 of outer yoke 4 and the insulation of the 2nd relative part 420 by tube portion 81.In addition, guarantee the insulation of coil 8 and the outer yoke 4 of the both ends of the surface of axis direction by this coil 8 by flange part 85.

Shown in Fig. 3, Fig. 4 (A), (B), (C), on the inner peripheral surface of tube portion 81, formation as the holding section towards the outstanding engaging protrusion 82 of interior yoke 3, the both sides of relative part 410 with the 1st in this holding section and the 2nd relative part 420 engaging prevents that the 1st and the 2nd relative part 410,420 from being attracted and displacement by magnet 9.

Here, shown in Fig. 4 (C), engaging protrusion 82 is by outstanding towards axis direction and form towards the projection 823,824 of the recess 821,822 of axis direction opening with the inner peripheral surface of tube portion 81; Constitute from central authorities' yoke 3 outstanding kicks 825 inwardly of the axis direction of this projection 823,824.

Relative therewith, the fore-end of the fore-end of the 1st relative part 410 and the 2nd relative part 420 forms interior all lateral processes 411,421 respectively; Outer circumferential side projection 412,422, between these projections 411,412, and projection 421,422 between form recess 413,423 respectively towards the axis direction opening.

Therefore, the the 1st and the 2nd outer yoke member 41,42 both sides from axis direction are overlapped on the coil rack 80, outer circumferential side at coil 8, when 419,429 butts of the end of yoke member outside the 1st and the 2nd 41,42, then in interior all sides of coil, the outer circumferential side projection 412,422 of the 1st and the 2nd outer yoke member 41,42 embeds the recess 821,822 of engaging protrusion 82, and the projection 823,824 of the recess 413,423 of the 1st and the 2nd outer yoke member 41,42 and engaging protrusion 82 is chimeric simultaneously.And, the front end of interior all lateral processes 411,421 of the 1st and the 2nd outer yoke member 41,42 and kick 825 butts of engaging protrusion 82.

Here, on the circumferencial direction of coil rack 80, form 8 such engaging protrusion 82.That is, engaging protrusion 82 is provided in full week with the form of yoke 3 in surrounding.Therefore, even the attraction that the 1st relative part 410 and the 2nd relative part 420 are subjected to magnet 9 is also kept by coil rack 80, so radially can displacement.

(assembling sequence of linear actuator and the method for attachment of linear actuator)

The exploded perspective view of each member of Fig. 5 is the application seen from oblique upper formation linear actuator of the present invention.

In this form, coil 8 and outer yoke member 41,42 assembled in advance be assembly 10.This assembly 10 is behind coiling coil 8 on the coil rack 80, by yoke member 41,42 forms from the both sides of axis direction are overlapping outside the 1st and the 2nd making with the state that straddles coil rack 80 up and down.

Assemble the linear actuator 1 of this form according to following steps.That is, at first an end of interior yoke 3 is fixed on the upper end of the cylindrical portion 16 of support 22.After all interior yokes 3 are fixed, engage keeping body 17 to put into the other end with yoke 3.Then, 3 screws 23 are put into the screw 221 that is formed on the support 22, then, from screw 23, said modules 10 is put into, this assembly 10 is placed in the assigned position of support 22.

And, the top of support 21 from assembly 10 covered, then, the set bolt 90 and the hold-down nut 94 that set 3 places by circumferencial direction are fixing with support 21,22.At this moment, assembly 10 is to be fixed on the support 21,22 by the state of support 21,22 clampings.At last, movable body 5 is put into the gap of yoke 3 and outer yoke 4, finish linear actuator 1.

(action)

Fig. 6 (A), (B) are respectively the key diagrams of the action of this linear actuator of expression.

In the linear actuator 1 of this form, the face excitation in the inboard of magnet 9 is that the face excitation in the S utmost point, the outside is the occasion of the N utmost point, shown in Fig. 6 (A), (B), produces the arrow B 1 of solid line, the magnetic field shown in the B2.Under this state, when when coil 8 applies alternating current, shown in Fig. 6 (A), during the side flow of front, produce the magnetic field shown in the dotted arrow B3 at electric current from the opposite side of drawing, side in the 1st gap 6, identical from the magnetic field of magnet 9, and in the 2nd gap 7 sides with magnetic line of force direction from coil 8, opposite from the magnetic field of magnet 9 with direction from the magnetic line of force of coil 8.Its result is used for magnet 9 towards the masterpiece of the below (side in the 2nd gap 7) of axis direction.

Relative therewith, shown in Fig. 6 (B), at electric current from producing the magnetic field shown in the dotted arrow B4 between the front side direction opposite side flow periods of drawing, side in the 1st gap 6, opposite from the magnetic field of magnet 9 with magnetic line of force direction from coil 8, and in the 2nd gap 7 sides, identical from the magnetic field of magnet 9 with direction from the magnetic line of force of coil 8.Its result is used for magnet 9 towards the masterpiece of the top (side in the 1st gap 6) of axis direction.

Like this, the direction of the power of the axis direction that magnet 9 is applied, the direction of the alternating magnetic field that causes with coil 8 is replaced accordingly, thus vibrate on axis direction with the movable body 5 of its one, from being installed in piston 130 outputting reciprocating linear movements on the movable body 5.

(other examples)

In the above-mentioned example, outstanding 4 protuberances that form 91 constitute from adjacent magnet 9 opposite face each other towards adjacent magnet 9 directions in overlapping utilization, but the number of protuberance is not limited to 4.In addition, also adjacent magnet 9 opposite face each other can be made such tilted shape shown in Fig. 7 (A) and constitute protuberance 92 as overlapping portion, also can be shown in Fig. 7 (B), the intercommunicating pore 93 of 2 faces of the thickness direction of utilization connection magnet 9 is as overlapping portion.

In the above-mentioned example, the two ends of magnet 9 are embedded in the magnet maintaining part 52 by inserting to be shaped, but also can be bonded and fixed on the magnet maintaining part 52 by the two ends of binding material with magnet 9.

And in the above-mentioned example, magnet 9 is square flat board, and 2 faces of thickness direction form parallel plane, but also can make two faces of magnet 9 form parallel curved surface.For example, also can form the circular-arc of regulation radius of curvature.

(effect of this form)

More than explanation is such, in the linear actuator 1 of this form, comprising: interior yoke 3; With with the outer peripheral face of interior yoke 3 between be formed on the 1st gap 6 that axis direction separates and the 2nd gap 7 form be provided in yoke 3 around outer yoke 4; By with outer yoke the 4, the 1st gap 6, interior yoke the 3, the 2nd gap 7, and outer yoke 4 as magnetic circuit in the 1st gap 6 and the drive division 87 that constitutes of the coil 8 of the 2nd gap 7 generation alternating magnetic fields; Interior yoke 3 and outside have magnet 9 between the yoke 4, and the movable body 5 that is back and forth driven towards axis direction linkedly with alternating magnetic field, outer yoke 4 and in yoke 3 dispose a plurality of in a circumferential direction with the opposite face on plane separately, movable body 5, have a plurality of magnet 9 that are configured in respectively between interior yoke 3 and the outer yoke 4, and between adjacent magnet 9, have the magnet maintaining part 52 that is shaped maintenance with burying underground and is made of resin is inserted in the two ends utilization of magnet 9, in magnet maintaining part 52, magnet 9 has protuberance 91 overlapping with resin on axis direction, protuberance 92 or through hole 93.Therefore, by direction of vibration be these overlapping overlapping stress that can bear direction of vibration of resin of axis direction at movable body 5.Magnet 9 like this, except the cohesive force of magnet 9 and resin, physically also bears the stress of direction of vibration, so even drive movable body 5 under harsh condition, can not peeled off from resin bed yet.Therefore, can prevent generation, the performance decrease of abnormal sound and peel off after magnet 9 contact with interior yoke 3 or outer yoke 4 and make the unfavorable condition of movable body 5 breakages.

Magnet maintaining part 52 at least a portion enter between the adjacent interior yoke 3 and reach between the adjacent outer yoke 4.Event can be done the wall thickness of magnet maintaining part 52 thick, guarantees rigidity.And, be wasted space between adjacent interior yoke 3 and the adjacent outer yoke 4, so need not maximizing, linear actuator 1 gets final product.

And magnet 9 is square flat boards, on adjacent magnet 9 opposite face each other, protuberance 91,92 forms highlightedly towards adjacent magnet 9 directions.Therefore, by overlapping portion is made of such protuberance 91,92, can constitute the good overlapping portion of balance from the aspect of intensity and little spatialization.And, can use simple upper and lower mould as the mould that forms magnet 9.

(the loading example on pump unit and compressor set)

For having used linear actuator 1 of the present invention, illustrated with reference to Fig. 8, applicable to pump unit and compressor set.

Fig. 8 is the cutaway view that air pump device of the present invention has been used in expression.

In Fig. 8, in the air pump device 100 of this form, the base end side of working shaft 110 utilizes packing ring 152 and nut 153 to connect with respect to the movable body 5 of linear actuator 1, as shown in Figure 4, working shaft 110 be in connect maintain in the state of cylindrical portion 16 of framework 2 of yoke 3.

Body side body 170 with air suction inlet 171 and air outlet 172 is fixed on by screw 23 on the bottom of support 22 of drive division 87, and filter 174 is installed on air suction inlet 171.Be equipped with cylinder shell 120 in the inboard of housing 170, the part with air suction inlet 171 face-offs in the bottom of cylinder shell 120 is fixed with valve 141 by valve pressing piece 143, is fixed with valve 142 in the part with air outlet 172 face-offs by valve pressing piece 144.

The inside of cylinder shell 120, and be equipped with the piston 130 that constitutes cylinder chamber 122 between the bottom of cylinder shell 120, be equipped with in the side of this piston 130 in order to ensure the airtight pressure rings 135 of cylinder shell 120 with interior all sides.

The fore-end of working shaft 110 is fixing with respect to piston 130 by nut 139 by packing ring 137,138 and O shape ring 136, and by the vibration of working shaft 110, piston 130 is driven towards axis direction.Therefore, when working shaft 110 by linear actuator 1 towards the base end side (towards the drawing top) of axis direction when mobile, then air sucks in the cylinder chamber 122 from air suction inlet 171, when working shaft 110 by linear actuator 1 towards the front (towards the drawing below) of axis direction when mobile, then the air in the cylinder chamber 122 are discharged from air outlet 172.In addition, in this form, with respect to the vibration of working shaft 110, the resonance that has utilized not shown spring and the outer leaf spring of adorning etc. to cause even used the air pump device 100 of small-sized linear actuator 1, also can obtain good pump characteristics.

Claims (7)

1. a linear actuator comprises: interior yoke; With with this in be formed on the 1st gap that axis direction separates and the 2nd gap between the outer peripheral face of yoke form be provided in yoke in this around outer yoke; By with described outer yoke, described the 1st gap, described in yoke, described the 2nd gap, and described outer yoke as magnetic circuit in described the 1st gap and the drive division that constitutes of the coil of described the 2nd gap generation alternating magnetic field; In described yoke and described outside the movable body that has magnet and back and forth driven towards axis direction linkedly between the yoke with described alternating magnetic field, it is characterized in that,

Described outer yoke and described interior yoke dispose a plurality of separately in a circumferential direction with opposite face,

Described movable body has a plurality of described magnet that is configured in respectively between described interior yoke and the described outer yoke, and between adjacent described magnet, has the magnet maintaining part that constitutes by resin of the two ends of described magnet being buried underground maintenance, in described magnet maintaining part, described magnet has overlapping portion overlapping with described resin on axis direction.

2. linear actuator as claimed in claim 1 is characterized in that, described magnet maintaining part at least a portion enters between the adjacent described interior yoke, reaches between the adjacent described outer yoke.

3. linear actuator as claimed in claim 1 or 2 is characterized in that, described overlapping portion is made of the protuberance of giving prominence to towards the direction of intersecting with axis direction.

4. linear actuator as claimed in claim 3 is characterized in that, described magnet is square thin plate, and described overlapping portion is made of the protuberance outstanding from adjacent described magnet opposite face each other towards adjacent described magnet direction.

5. linear actuator as claimed in claim 1 is characterized in that, described overlapping portion is made of the intercommunicating pore of 2 faces of the thickness direction that is communicated with described magnet.

6. a pump unit is characterized in that, has used the linear actuator of any 1 defined in the claim 1 to 5.

7. a compressor set is characterized in that, has used the linear actuator of any 1 defined in the claim 1 to 5.

Images