CN109798363A - Motor-driven valve - Google Patents

Abstract

The present invention provides a kind of reduced motor-driven valve for being able to suppress action.At least one party in the external thread part (23) of pilot bushing (20) and the internal thread part (33) of valve shaft retainer (30) for constituting feed screw mechanism (28) is equipped with the longitudinally through slot (23t, 33t) throughout lifting direction (axes O direction) overall length.

Description

Motor-driven valve

Technical field

The present invention relates to a kind of to be assembled in the refrigeration cycle such as air conditioner, refrigeration machine and quilt as flow control valve etc. The motor-driven valve used, more particularly to the feed screw mechanism by being made of external thread part and internal thread part is by the rotation of motor The motor-driven valve of the dynamic type for being transformed to linear motion and going up and down spool of transhipment.

Background technique

For example, the motor-driven valve of motor driven type by the feed screw mechanism that is made of external thread part and internal thread part come The rotary motion of motor is transformed to move along a straight line, so that spool be made to go up and down relative to valve seat and carry out the opening and closing of valve (that is, logical Cross the flow control of the fluid (refrigerant) of valve port).

As this motor-driven valve, such as a kind of structure known, have: valve shaft, the valve shaft are equipped with spool in lower end；Guiding Bushing, the valve shaft insert in the pilot bushing can prolong axis direction relative movement and be capable of in the state of relative rotation；Valve Main body, the valve body have the seat portion (valve seat) for contacting, separating with the spool, and are mounted with the guiding lining Set；Valve shaft retainer, which has cylindrical portion and top, and links with the valve shaft and fix, the cylindrical portion For the pilot bushing interpolation, the top perforation is equipped with the insertion hole inserted for the upper end of the valve shaft；Force application part, should Force application part is plugged between the valve shaft and the valve shaft retainer, to exert a force to the spool to valve closing direction；It is electronic Machine, the motor have the rotor and stator for rotating the valve shaft retainer relative to the pilot bushing；Screw thread into To mechanism, the feed screw mechanism is by being formed in the fixed thread portion (external thread part) of the periphery of the pilot bushing and being formed in The movable threaded portion (internal thread part) of the inner circumferential of the valve shaft retainer is constituted, and is made for being driven according to the rotation of the rotor The spool of the valve shaft is gone up and down relative to the seat portion (valve seat)；And lower part stop mechanism, the lower part stop mechanism It is made of the fixed stop body for being set to lower part retainer and the movable stop-motion body for being set to the valve shaft retainer, described in progress The rotation of valve shaft retainer moves down limitation, and the lower part retainer has the fixed thread portion with the pilot bushing The internal thread part being spirally connected, when the spool is located at most down position, the shape between the spool and the seat portion (valve seat) At the gap for having prescribed level (for example, referring to patent document 1).

In the air conditioner using non-valve closing type motor-driven valve as described above, even if it is (logical to be located at most down position in spool It is often to become full-shut position) when, the gap of prescribed level is also formed between valve seat, therefore for example removed at dead of night In the case where wet operating, motor-driven valve can not be set as to full-shut position to reduce the operating of the state of refrigeration dose, can be pressed down Make the generation that sound is run as caused by the on/off of motor-driven valve.It is and common in addition, in motor-driven valve as described above The motor-driven valve of valve closing type is compared, and is also reliably prevented from spool to valve seat the advantages of biting.

In addition, as the feed screw mechanism for going up and down spool relative to valve seat, it is also known that using being formed in valve shaft Periphery external thread part and be formed in pilot bushing inner circumferential internal thread part mechanism (for example, referring to patent document 2).

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2016-217451 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2016-089870 bulletin

However, there is following worry in this motor-driven valve: when in the external thread part and interior spiral shell for constituting feed screw mechanism When being caught in foreign matter (between flank) between line portion, resistance to sliding increases and generates valve shaft to be difficult to mobile such movement bad.

In addition, in recent years, with cost effective, lightweight etc., to having the external thread part for constituting feed screw mechanism, interior The part of threaded portion using PPS etc. resin material the case where increase.In this case, consider to pass through good point of forming efficiency Pattern shapes to make the part with external thread part, internal thread part.But the case where using parting contour forming Under, parting line, weld line are generated (although the position generated is according to pouring in the sliding surface (flank) of external thread part, internal thread part Mouthful position and it is different, still, be that material is impinging one another in forming and the position or generation material swelled do not substantially arrive at The position of defect), this becomes the obstruction of sliding, there is the worry for generating the defects of action reduces.

Summary of the invention

The present invention is completed in view of aforementioned problems, and its purpose is to provide a kind of the electronic of reduction for being able to suppress action Valve.

In order to solve the above problems, motor-driven valve according to the present invention substantially has: valve shaft, is equipped with valve in the valve shaft Core；Pilot bushing, the valve shaft can relatively move in the axial direction and interior with the relative rotation can insert in the pilot bushing；Valve Main body, the valve body have the valve port with valve seat, and the spool is contacted with the valve seat, separated, and the valve body is equipped with institute State pilot bushing；Valve shaft retainer, the valve shaft retainer and the valve shaft link；Shell, the shell are fixed on the valve body； Motor, the motor have rotor and stator, this turn for rotating the valve shaft retainer relative to the pilot bushing It is sub to link with the valve shaft retainer；And feed screw mechanism, the feed screw mechanism are used for the rotation based on the rotor It drives go up and down the spool of the valve shaft relative to the valve seat of the valve body, has and be set to the guiding lining External thread part and internal thread part between set and the valve shaft retainer, the motor-driven valve is characterized in that, in the external screw thread At least one party in portion and the internal thread part is equipped with the longitudinally through slot throughout lifting direction overall length.

In preferred form, the longitudinally through slot spreads described equipped with the external thread part or the internal thread part The lifting direction of the wall surface of pilot bushing or the valve shaft retainer is endlong extended.

In other preferred forms, the longitudinally through slot is made of the concavity face for being set to the internal thread part.

In other preferred forms, the longitudinally through slot is cut by the concavity face or D for being set to the external thread part Face is constituted.

In other preferred forms, the longitudinally through slot along the external thread part or the internal thread part parting Line or weld line are formed.

In addition, motor-driven valve according to the present invention substantially has, valve shaft is equipped with spool in the valve shaft；Pilot bushing, institute It states and inserts in the pilot bushing in valve shaft；Valve body, the valve body have the valve port with valve seat, the spool contacts with the valve seat, Separation, and the valve body is equipped with the pilot bushing；Shell, the shell are set to the valve body；Motor, this is electronic Machine is for rotating the valve shaft relative to the pilot bushing and having rotor and stator；And feed screw mechanism, the spiral shell Line feed mechanism is used to make the spool of the valve shaft relative to the valve body based on the rotation of rotor driving Valve seat lifting, has external thread part and internal thread part, and the motor-driven valve is characterized in that, in the external thread part and described At least one party in internal thread part is equipped with the longitudinally through slot throughout lifting direction overall length.

Invention effect

According to the present invention, at least one party in the external thread part and internal thread part for constituting feed screw mechanism is equipped with and spreads The longitudinally through slot of direction overall length is gone up and down, therefore fluid (refrigerant) passes through throughout lifting direction overall length and external thread part and interior spiral shell The i.e. described longitudinally through slot in the out of mesh part in line portion (part that flank does not contact each other) and smoothly flow, can be via Foreign matter between intrusion external thread part and internal thread part (between flank) is energetically discharged the longitudinally through slot, therefore can subtract The small risk being caught in and the reduction for inhibiting action.

If in addition, even if also can in the case where being caught in foreign matter (between flank) between external thread part and internal thread part Make foreign matter mobile by the relative rotation of external thread part and internal thread part, do not engage from external thread part with internal thread part described in The foreign matter is discharged in longitudinally through slot, therefore can be reliably suppressed the reduction of action.

It is made of in addition, being formed along the parting line or weld line of external thread part or internal thread part concavity face, D cut surface Longitudinally through slot can more reliably inhibit the drop of action so that the sliding as caused by weld line, parting line hinders to disappear It is low.

Detailed description of the invention

Fig. 1 is the longitudinal section view for indicating the first embodiment of motor-driven valve according to the present invention.

Fig. 2 indicates valve shaft retainer shown in FIG. 1, and (A) is perspective view, and (B) is top view.

Fig. 3 be along Fig. 1 cross-sectional view from U-U to edge.

Fig. 4 is the cross-sectional view for indicating valve shaft retainer shown in FIG. 1 to edge along the V-V of Fig. 3.

Fig. 5 is the longitudinal section view for indicating the second embodiment of motor-driven valve according to the present invention.

Fig. 6 be along Fig. 5 cross-sectional view from U-U to edge.

Fig. 7 be along Fig. 6 expression valve shaft retainer shown in fig. 5 from V-V to edge cross-sectional view.

Fig. 8 is the longitudinal section view for indicating the third embodiment of motor-driven valve according to the present invention.

Fig. 9 be along Fig. 8 cross-sectional view from U-U to edge.

Figure 10 is the left side view for indicating pilot bushing shown in Fig. 8.

Figure 11 is the longitudinal section view for indicating the 4th embodiment of motor-driven valve according to the present invention.

Figure 12 be along Figure 11 cross-sectional view from U-U to edge.

Figure 13 is the left side view for indicating pilot bushing shown in Figure 11.

Symbol description

1 motor-driven valve (first embodiment)

2 motor-driven valves (second embodiment)

3 motor-driven valves (third embodiment)

4 motor-driven valves (the 4th embodiment)

10 valve shafts

14 spools

20 pilot bushings

21 cylindrical portions

22 extended portions

23 fixed thread portions (external thread part)

The longitudinally through slot of 23t (third, the 4th embodiment)

24 fixed stop bodies

25 lower part retainers

28 feed screw mechanisms

29 lower part stop mechanisms

30 valve shaft retainers

31 cylindrical portions

32 tops

33 movable threaded portions' (internal thread part)

The longitudinally through slot of 33t (the first, second embodiment)

34 movable stop-motion bodies

35 protrusions

40 valve bodies

40a valve chamber

41 first openings

The first conduit of 41a

42 second openings

The second conduit of 42a

43 insertion holes

44 embedded holes

45 base walls

46 valve ports

46a valve seat

47 flange shape plates

48 stop presser feets

50 stepper motors

51 rotors

52 stators

55 shells

60 compression helical springs

70 fixation members

71 fixed parts

72 flange parts

O axis

Specific embodiment

Hereinafter, the embodiments of the present invention will be described with reference to the drawings.

In addition, in the various figures, for easy understanding inventing and seeking the convenience of mapping, be formed in gap, portion between component Isolation distance etc. between part has the case where exaggeration is described.In addition, in the present specification, up and down, left and right etc. indicate position, direction It records on the basis of being shown by the direction arrow of Fig. 1 and Fig. 2, does not imply that position, the direction under real use state.

[first embodiment]

Fig. 1 is the longitudinal section view for indicating the first embodiment of motor-driven valve according to the present invention.

The motor-driven valve 1 of illustrated embodiment is the system such as be assembled into air conditioner, refrigeration machine as flow control valve etc. SAPMAC method and the motor-driven valve used, mainly have: valve shaft 10, pilot bushing 20, valve shaft retainer 30, valve equipped with spool 14 Main body 40, shell 55, the stepper motor 50 being made of rotor 51 and stator 52, compression helical spring (force application part) 60, conduct Fixation member 70, feed screw mechanism 28 and the lower part stop mechanism 29 of retainer.

The valve shaft 10 from upside with top small diameter portion 11, intermediate large-diameter portion 12 and lower part small diameter portion 13, under this The lower end of portion's small diameter portion 13 is integrally formed with for being controlled by flow to the fluid (refrigerant) for flowing through valve port 46 The spool 14 of the inverted cone-shaped with the level of system.

The pilot bushing 20 is, for example, resin, has cylindrical portion 21 and an extended portion 22, the valve shaft 10 ( Intermediate large-diameter portion 12) can relatively move (sliding) along axes O direction and can be inserted in the state of axes O relative rotation The cylindrical portion 21, which extends upwards from the upper end of the cylindrical portion 21 and internal diameter is bigger than the cylindrical portion 21, And interpolation has the upper end side of the intermediate large-diameter portion 12 of the valve shaft 10 and the lower end side of top small diameter portion 11.It is served as a contrast in the guiding The periphery of the cylindrical portion 21 of set 20 is formed with fixed thread portion (external thread part) 23, which, which is constituted, is based on rotor 51 Rotation driving come the feed screw mechanism 28 that goes up and down the spool 14 of the valve shaft 10 relative to the valve seat 46a of valve body 40 One side.In addition, the lower part (than fixed thread portion 23 close to the part of downside) of the cylindrical portion 21 is set as major diameter and is set as The fitting portion 27 being fitted into the embedded hole 44 of valve body 40.The fixed thread portion 23 (in it is more close than valve shaft retainer 30 Downside) it is bolted with lower part retainer 25, it is integrally arranged in the prominent part of fixed stop body 24 in the periphery of the lower part retainer 25, this is solid Determine stop-motion body 24 and constitutes the side for moving down the lower part stop mechanism 29 limited to the rotation of valve shaft retainer 30.This Outside, in this example, the upper surface 27a of fitting portion 27 is set as limiting (in other words, moving down for lower part retainer 25 Provide the position of the lower part retainer 25 under aftermentioned state of taking a seat) retainer.

In addition, in this example, outside the lower part retainer 25 for being installed on the pilot bushing 20 (fixed thread portion 23) Equipped with stop presser feet 48, by the stop presser feet 48, lower part retainer 25 is relative to pilot bushing 20 (fixed thread portion 23) Connection is that cannot rotate (in narration in detail later).

The valve shaft retainer 30 be, for example, resin system (preferably, it is contemplated that with the contact of fixation member 70 and utilize The high stainless steel of wearability, carbon fiber etc. strengthen after resin system), there is cylindrical portion 31 and top 32, in the cylindrical portion 31 It is inserted with the pilot bushing 20, the top 32 perforation is equipped with by the upper end of the valve shaft 10 (top small diameter portion 11) (with energy It is enough along the relative movement of axes O direction and can be around the state of axes O relative rotation) the insertion hole 32a of insert.It is protected in the valve shaft The inner circumferential lower part for holding the cylindrical portion 31 of frame 30 is formed with movable threaded portion (internal thread part) 33, which leads with described It is screwed togather to the fixed thread portion 23 of bushing 20 and constitutes the feed screw mechanism 28.In addition, the inner circumferential top of cylindrical portion 31 with The periphery of the cylindric extended portion 22 of the pilot bushing 20 abuts (sliding contact), as a result, the valve shaft retainer 30 An edge axes O direction (up and down direction) lifting is guided by pilot bushing 20 (periphery) on one side.In addition, in the cylindrical portion 31 Periphery lower end is integrally arranged in the prominent part of movable stop-motion body 34, which constitutes the another of the lower part stop mechanism 29 Side.

In addition, referring to FIG. 1 and FIG. 2 it is found that the top 32 of the valve shaft retainer 30 upper surface (with aftermentioned fixation The opposite opposite face of the flange part 72 of component 70) be integrally formed under vertical view and (looked up in axes O side) it is generally fan-shaped Two protrusions 35 of shape (being the fan shape that central angle is about 90 degree herein).Specifically, described two protrusions 35 around The insertion hole 32a (in other words, around the rotation axis O of valve shaft retainer 30) of the upper surface at top 32 and exist relative to axes O Opposite side (in other words, in the symmetrical position rotation axis O relative to valve shaft retainer 30) is provided projectingly upward, and is had It will (be in this example, the upper section of the end face 34a in the circumferential direction of the movable stop-motion body 34, that is, be included between them With the end face 34a in the circumferential direction of the movable stop-motion body 34 with the part of position when axes O side looks up) excision obtain Shape (notch 36 of generally fan-shaped shape (being herein the fan shape at about 90 degree of center angle) under vertical view).

By the protrusion 35, valve shaft retainer 30 is reduced relative to the contact area of fixation member 70, therefore such as valve Contact resistance (rotational slide resistance) when axis retainer 30 is abutted with fixation member 70 becomes smaller.

In addition, being shaped such as in the situation made of the formed products resin of valve shaft retainer 30 by making When formed weld line, parting line position be overlapped with the position of notch 36, that is, form weld line, parting line in forming Notch 36 is arranged in position, and so as to further decrease the contact resistance (rotational slide resistance), also, the valve shaft is kept The flatness of the sliding surface of frame 30 gets higher and can further suppress the axle offset of valve shaft 10.

For example, the opposite side setting of the movable stop-motion body 34 in valve shaft retainer 30 is used for the resin of injection molding In the case where cast gate, as previously mentioned, by the top of movable stop-motion body 34 (more specifically, the circumferential direction of movable stop-motion body 34 On an end face 34a upper section) setting notch 36, thus the protrusion 35 of the valve shaft retainer 30 there is no forming when Weld line, the parting line of formation, therefore the contact resistance (rotational slide resistance) can be further decreased, also, the valve The flatness of the sliding surface of axis retainer 30 gets higher and can further suppress the axle offset of valve shaft 10.

In addition, by the upper surface at the top of valve shaft retainer 30 32 by the protrusion 35 relative to valve shaft retainer 30 Rotation axis O symmetrically configure, to more effectively inhibit the axle offset of valve shaft 10, also, by dividing the protrusion 35 Multiple positions of the rotation axis O around valve shaft retainer 30 are configured at, scatteredly so as to make 30 (protrusion of valve shaft retainer 35) contact area relative to fixation member 70 is further reduced.

In addition, shape, number, the position of protrusion 35 etc. that are arranged in the upper surface at the top 32 of the valve shaft retainer 30 It is certainly not limited to illustrated example, the protrusion 35 also can be omitted.

In addition, step surface (the ladder between the top small diameter portion 11 for being formed in the valve shaft 10 and intermediate large-diameter portion 12 Portion) 15 and the valve shaft retainer 30 top 32 lower surface between, to clip the top for being configured at the valve shaft retainer 30 The mode of the disk-shaped pressing plate (washer) 61 of the lower face side in portion 32 and the top small diameter portion 11 for inserting in valve shaft 10 outside compresses dress Equipped with cylindric compression helical spring (force application part) 60, the compression helical spring 60 is to making the valve shaft 10 and the valve shaft The direction separate in lifting direction (axes O direction) of retainer 30 exerts a force, in other words, always to the valve shaft 10 (spool 14) (valve closing direction) exerts a force downwards.

The valve body 40 is constituted such as the made of metal cylinder by brass, stainless steel.Including the valve body 40 has Portion imports and exports the transverse direction of the valve chamber 40a, the first conduit 41a of fluid by soldering etc. with the side for being set to valve chamber 40a First opening 41 connection fix, insertion hole 43 and embedded hole 44 are formed at the top of valve chamber 40a, the insertion hole 43 is for institute Valve shaft 10 (intermediate large-diameter portion 12) is stated so that (sliding) can be relatively moved along axes O direction and can be around axes O relative rotation State insert, the embedded hole 44 is chimeric by the lower part (fitting portion 27) of the pilot bushing 20 and installs and fixes, the second conduit 42a is fixed by soldering etc. and longitudinal 42 connection of the second opening for the lower part for being set to valve chamber 40a.In addition, described Valve chamber 40a and it is described second opening 42 between base wall 45 be formed with valve port 46 with the level, the valve port 46 have with it is described The valve seat 46a of the contact of spool 14, separation.

In the upper end periphery of the valve body 40, it is fixed with circular flange shape plate 47 by riveting, being brazed etc., and And the stepped part in the periphery for being set to the flange shape plate 47, being sealingly engaged by jam weld etc. has the cylindrical shape with top The lower end of shell 55.

In addition, in this example, in the upper surface (surface of 55 side of shell) of the flange shape plate 47, configuration is fixed with stop Presser feet 48, the stop presser feet 48 engage with the lower part retainer 25 and prevent the lower part retainer 25 relative to pilot bushing 20 Relative rotation.

The stop presser feet 48 is, for example, to pass through circle made of punch process etc. the metal parts of brass, stainless steel etc. Plate-shaped member is constituted, and is formed with the insert opening for the lower part retainer 25 insert, and be adjacent to the insert opening and (change speech It, in the outer peripheral portion of insert opening) it erects to be equipped with and multiple (scheme to what the lower part retainer 25 (outer surface) was clamped Two therein are shown in 1) bearing claw 49 (detailed configuration is referring for example to above patent document 1).

The outer peripheral portion of the stop presser feet 48 abuts with flange shape plate 47 (upper surface) and by welding/deposition/bonding Deng and engage and fix, lower part retainer 25 is relative to pilot bushing 20 (fixed thread portion 23) connection to be unable to relative rotation.

In the inside of the shell 55 and the outside of the pilot bushing 20 and the valve shaft retainer 30, rotatably freely It is configured with to drive the rotor 51 to rotate by yoke 52a, coil configured with rotor 51 in the outside of the shell 55 The stator 52 of the compositions such as frame 52b, stator coil 52c and resin molded shell 52d.More leads are connected in stator coil 52c Terminal 52e, these lead terminals 52e are connect via substrate 52f with more lead 52g, pass through the energization to stator coil 52c Excitation and make the rotor 51 being configured in shell 55 around axes O rotate.

Be configured in shell 55 the rotor 51 engaging is supported on the valve shaft retainer 30, the valve shaft retainer 30 with The rotor 51 (integrally) rotates together.

Specifically, the rotor 51 is set as the double pipe knot being made of inner cylinder 51a, outer cylinder 51b and interconnecting piece 51c Structure, interconnecting piece 51c connects inner cylinder 51a and outer cylinder 51b in the defined angle position around axes O, inner cylinder 51a's Inner circumferential, (for example, around axes O with 120 degree of angle interval) are formed with the cannelure extended along axes O direction (up and down direction) 51d。

On the other hand, in the periphery (top half) of the valve shaft retainer 30, referring to Fig. 2 it is found that end is set on it There is the conical surface portion 30c being made of circular cone table top, in the downside of conical surface portion 30c, (for example, around axes O with 120 degree of angle Interval) it is arranged in the prominent part of the ridge 30a vertically extended, the bearing rotor is formed in the lower part two sides of ridge 30a 51 locking side 30b upward.

Like this, the cannelure 51d of the inner cylinder 51a of rotor 51 engages with the ridge 30a of valve shaft retainer 30, also, rotor The lower surface of 51 inner cylinder 51a is abutted with the locking side 30b of valve shaft retainer 30, so that rotor 51 is relative to valve shaft retainer 30 state supports positioned are fixed on its periphery, and described 30 one side of valve shaft retainer supports the rotor in the shell 55 51 one side rotate together with the rotor 51.

In addition, in this example, the rotor 51 is with the upper table of the upper surface of valve shaft retainer 30 and the inner cylinder 51a of rotor 51 The concordant or mode positioned at the slightly position of upside in face, which engages, is supported on the valve shaft retainer 30.

In the upside of the rotor 51 and valve shaft retainer 30, valve shaft retainer 30 and rotor 51 are in lifting side in order to prevent Upward relative movement (in other words, press rotor 51 downwards relative to valve shaft retainer 30 and anticreep is locking) and by valve Axis 10 and valve shaft retainer 30 link up and are configured with and are externally embedded to the upper end for being fixed on the valve shaft 10 (top small diameter portion 11) The fixation member 70 in portion.

The fixation member 70 is, for example, to pass through punch process, machining etc. by the metal parts of brass, stainless steel etc. And it is manufactured, there is fixed part 71 and disk-shaped flange part 72 with step cylindrical shape, the fixed part 71 is by outside embedded in described The upper end of valve shaft 10 (top small diameter portion 11) and the path top fixed by the engagement such as indentation, welding, deposition, bonding 71a and major diameter lower part 71b are constituted, the flange part 72 from the lower end of the fixed part 71 (major diameter lower part 71b) extend outwardly to Near the inner cylinder 51a of rotor 51.

The upper surface of the lower surface of the flange part 72 and the valve shaft retainer 30 and rotor 51 (inner cylinder 51a) it is upper Surface is opposite, and the 51 (inner cylinder of protrusion 35 (upper surface) and rotor with the upper surface for being set to the valve shaft retainer 30 The upper surface of 51a) docking.

As previously mentioned, the rotor 51 is held on the valve to be exerted a force upwards by the active force of compression helical spring 60 It is between axis retainer 30 and the fixation member 70 (outer peripheral portion of flange part 72) and locking by anticreep.

In addition, be fixed on the fixation member 70 of upper end of the valve shaft 10 (in fixed part 71 major diameter under Portion 71b), in movement, relative to pilot bushing 20, excessively movement leads to pilot bushing to valve shaft retainer 30 upwards in order to prevent 20 fixed thread portion 23 and the screwing togather for movable threaded portion 33 of valve shaft retainer 30 are threaded off outside equipped with return spring 75, this is multiple Former spring 75 is from constituting valve shaft retainer 30 to the helical spring that 20 side of pilot bushing exerts a force.

Also, in the motor-driven valve 1, such as the biting and ensure low discharge domain to valve seat 46a of spool 14 in order to prevent In controlling it is big that regulation is formed between spool 14 and valve seat 46a when spool 14 is in most down position (origin position) Small gap.

When the origin position (most down position) of assembling procedure, especially spool 14 to the motor-driven valve 1 determine process into When row is described in detail, firstly, by valve shaft 10, pilot bushing 20, lower part retainer 25, compression helical spring 60, valve shaft retainer 30, rotor 51, valve body 40, flange shape plate 47 etc. assemble.For example, flange shape plate 47 is brazed in valve body 40 and will be oriented to The indentation of bushing 20 is fixed to after valve body 40, and lower part retainer 25 is spirally connected to pilot bushing 20 (fixed thread portion 23) And they are assembled.At this point, lower part retainer 25 is screwed togather relative to pilot bushing 20 as can relative rotation.In addition, at this stage, Lower part retainer 25 can configure with abutting with the retainer 27a of pilot bushing 20, can also be spaced apart with retainer 27a Ground configuration.Then, until the spool 14 for being set to the lower end of valve shaft 10 is abutted and (taken a seat) in valve seat 46a, compression helical spring 60 are somewhat compressed, the movable stop-motion body 34 of valve shaft retainer 30 is abutted with the fixed stop body 24 of lower part retainer 25 and under Until portion's retainer 25 (lower surface) is abutted with the retainer 27a of pilot bushing 20, the fixation spiral shell by pilot bushing 20 is utilized The feed screw mechanism 28 that line portion 23 and the movable threaded portion 33 of valve shaft retainer 30 are constituted makes the valve shaft retainer 30, turns Son 51 and valve shaft 10 decline while rotating.Also, the state of most down position is configured in valve shaft retainer 30 like this Under, fixation member 70 is externally embedded to the upper end (state of taking a seat) for being fixed on valve shaft 10 by indentation, welding, deposition, bonding etc..

Then, make valve shaft 10, valve shaft retainer 30, rotor 51, fixation member 70 using the feed screw mechanism 28 Etc. after assembly made of one rises while rotating from above-mentioned state of taking a seat and disassembles from pilot bushing 20, make Stop presser feet 48 is fallen into from top outside loaded on lower part retainer 25 and being placed on valve body 40 and flange shape plate 47, makes lower part Retainer 25 and stop presser feet 48 are together relative to pilot bushing 20 to valve opening position (for example, for counterclockwise under vertical view) Rotation regulation rotation angle.Also, the engagement of stop presser feet 48 is being fixed on by valve body 40 by welding/deposition/bonding etc. Flange shape plate 47 and by lower part retainer 25 and pilot bushing 20 (fixed thread portion 23) connection be fixed as being unable to relative rotation And then the assembly is assembled into pilot bushing 20 by secondary utilization feed screw mechanism 28.As a result, due to lower part retainer Position change of the 25 fixed stop body 24 relative to pilot bushing 20, therefore, even the movable stop of valve shaft retainer 30 Body 34 is abutted with the fixed stop body 24 of lower part retainer 25 and when valve shaft retainer 30 is in most down position, also in spool 14 The gap of prescribed level is formed between valve seat 46a.

In addition it is also possible to making lower part retainer 25 relative to guiding before retainer 25 is installed to the lower part stop presser feet 48 Bushing 20 rotates regulation rotation angle to valve opening position, thereafter, lower part retainer 25 will be loaded on outside stop presser feet 48 and is engaged solid Due to the flange shape plate 47 of valve body 40.

In the motor-driven valve 1 of the structure, when by making rotor 51 to the energization excitation of stator 52 (stator coil 52c) When rotation, valve shaft retainer 30 and valve shaft 10 are integrally rotated with rotor 51.At this point, passing through the fixed thread by pilot bushing 20 The feed screw mechanism 28 that portion 23 and the movable threaded portion 33 of valve shaft retainer 30 are constituted goes up and down valve shaft 10 in company with spool 14, Gap between spool 14 and valve seat 46a (lift, valve opening) increase and decrease and adjust the fluids such as refrigerant pass through stream as a result, Amount.In addition, even the movable stop-motion body 34 of valve shaft retainer 30 and the lower part retainer 25 that is fixed on pilot bushing 20 are consolidated Determine that stop-motion body 24 abuts and spool 14 is also formed with gap, therefore when being in most down position between spool 14 and valve seat 46a Ensure specified amount passes through flow.

In addition to above structure takes following method in order to ensure action in the motor-driven valve 1 of present embodiment.

That is, referring to Fig.1, Fig. 3 and Fig. 4 it is found that the cylindrical portion 31 of valve shaft retainer 30 inner circumferential formed it is movable threaded Portion's (internal thread part) 33 is formed with the longitudinal direction being made of the concavity face being endlong extended throughout axes O direction (lifting direction) Through slot 33t.In this example, relative to axes O in opposite side (in other words, in the rotation axis O relative to valve shaft retainer 30 Symmetrical position) it sets there are two the longitudinally through slot 33t.

Like this, in the motor-driven valve of present embodiment 1, due in the valve shaft retainer 30 for constituting feed screw mechanism 28 Internal thread part 33 be equipped with the longitudinally through slot 33t throughout lifting direction (axes O direction) overall length, therefore stream (in shell 55) Body (refrigerant) passes through external thread part 23 and valve shaft retainer throughout lifting direction (axes O direction) overall length and pilot bushing 20 The i.e. described longitudinally through slot 33t in the 30 out of mesh part of internal thread part 33 (part that flank does not contact each other) and smoothly Flowing, can will invade between external thread part 23 and internal thread part 33 foreign matter (between flank) via the longitudinally through slot 33t It is energetically discharged, therefore the risk being caught in can be reduced and the reduction that inhibits action.

If in addition, even if between the external thread part 23 of pilot bushing 20 and the internal thread part 33 of valve shaft retainer 30 In the case that (between flank) is caught in foreign matter, also foreign matter can be made to move by the relative rotation of external thread part 23 and internal thread part 33 It is dynamic, the foreign matter is discharged from external thread part 23 with the longitudinally through slot 33t that internal thread part 33 does not engage, therefore can be reliable The reduction of ground inhibition action.

In addition, such as in the case where the valve shaft retainer 30 is situation made of the formed products resin, by make at The position of the weld line, parting line that are formed when shape is overlapped with the position of longitudinally through slot 33t, that is, is formed in along in forming The weld line of the internal thread part 33 of valve shaft retainer 30, parting line form longitudinally through slot 33t, thus by weld line, parting Sliding caused by line hinders to disappear, and can more reliably inhibit the reduction of action.

For example, the opposite side setting of the movable stop-motion body 34 in valve shaft retainer 30 is used for the resin of injection molding In the case where cast gate, as previously mentioned, by the inside of movable stop-motion body 34 (more specifically, the circumferential direction of movable stop-motion body 34 On an end face 34a inside) the longitudinally through slot 33t of setting, so that the internal thread part 33 in the valve shaft retainer 30 is not deposited Weld line, the parting line formed in forming, therefore as previously mentioned, can more reliably inhibit the reduction of action.

[second embodiment]

Fig. 5 is the longitudinal section view for indicating the second embodiment of motor-driven valve according to the present invention.

Motor-driven valve 1 primarily longitudinal perforation of the motor-driven valve 2 of this second embodiment relative to above-mentioned first embodiment The shape of slot 33t is different, and other structures are roughly the same.Therefore, additional in part corresponding with each section of first embodiment Common symbol simultaneously omits repeated explanation, hereinafter, stressing to difference.

In the motor-driven valve 2 of present embodiment, referring to Fig. 5, Fig. 6 and Fig. 7 it is found that the longitudinally through slot 33t (changes speech It, concavity face) it is extended the upside of internal thread part 33, throughout the inner circumferential (inner wall) of the cylindrical portion 31 of valve shaft retainer 30 Axes O direction (lifting direction) endlong formed.

Like this, in the motor-driven valve of present embodiment 2, the longitudinally through slot 33t spreads the circle of valve shaft retainer 30 The axes O direction (lifting direction) of the inner circumferential (inner wall) of canister portion 31 is endlong extended, and is prolonged in the upside of internal thread part 33 Setting is stretched to the part for abutting (sliding contact) with the periphery of the extended portion 22 of pilot bushing 20, therefore in addition to external thread part Between 23 and internal thread part 33 (between flank) except, also be easy will invade valve shaft retainer 30 cylindrical portion 31 and pilot bushing Foreign matter between 20 extended portion 22 (between sliding surface) is discharged from the longitudinally through slot 33t, can more reliably inhibit dynamic The reduction for the property made.

In addition, such as in the case where the valve shaft retainer 30 is situation made of the formed products resin, by along Weld line, the parting line that the inner circumferential (inner wall) of valve shaft retainer 30 is formed in when forming form longitudinally through slot 33t, thus by Sliding caused by weld line, parting line hinders to disappear, and can more reliably inhibit the reduction of action.

For example, the opposite side setting of the movable stop-motion body 34 in valve shaft retainer 30 is used for the resin of injection molding In the case where cast gate, as previously mentioned, by the inside of movable stop-motion body 34 (more specifically, the circumferential direction of movable stop-motion body 34 On an end face 34a inside) be arranged (throughout axes O direction overall length) longitudinally through slot 33t, thus the valve shaft keep The inner circumferential (inner wall) (internal thread part 33 and the part abutted with the periphery of the extended portion 22 of pilot bushing 20) of frame 30 is no Weld line, the parting line formed when in the presence of forming, therefore as previously mentioned, can more reliably inhibit the reduction of action.

[third embodiment]

Fig. 8 is the longitudinal section view for indicating the third embodiment of motor-driven valve according to the present invention.

Motor-driven valve 1 primarily longitudinal perforation of the motor-driven valve 3 of this third embodiment relative to above-mentioned first embodiment The forming position of slot 33t is different, and other structures are roughly the same.Therefore, in part corresponding with each section of first embodiment It adds common symbol and omits repeated explanation, hereinafter, being stressed to difference.

In the motor-driven valve 3 of present embodiment, referring to Fig. 8, Fig. 9 and Figure 10 it is found that being substituted in the interior of valve shaft retainer 30 The longitudinally through slot 33t that threaded portion 33 is formed, and in the fixed thread portion of the periphery for the cylindrical portion 21 for being formed in pilot bushing 20 (external thread part) 23 is formed with to be passed through by the longitudinal direction that the concavity face being endlong extended throughout axes O direction (lifting direction) is constituted Through slot 23t.

Like this, in the motor-driven valve of present embodiment 3, due to constituting the pilot bushing 20 of feed screw mechanism 28 External thread part 23 be equipped with throughout lifting direction (axes O direction) overall length longitudinally through slot 23t, therefore with above-mentioned first embodiment party Formula is identical, and (in shell 55) fluid (refrigerant) passes through throughout lifting direction (axes O direction) overall length and pilot bushing 20 The out of mesh part of internal thread part 33 (part that flank does not contact each other) the i.e. institute of external thread part 23 and valve shaft retainer 30 It states longitudinally through slot 23t and smoothly flows, can will invade external thread part 23 and internal thread part via the longitudinally through slot 23t Foreign matter between 33 (between flank) is energetically discharged, therefore can reduce the risk being caught in and the reduction that inhibits action.

If in addition, even if between the external thread part 23 of pilot bushing 20 and the internal thread part 33 of valve shaft retainer 30 In the case that (between flank) is caught in foreign matter, also foreign matter can be made to move by the relative rotation of external thread part 23 and internal thread part 33 It is dynamic, the foreign matter is discharged from external thread part 23 with the longitudinally through slot 23t that internal thread part 33 does not engage, therefore can be reliable The reduction of ground inhibition action.

In addition, being shaped such as in the case where the pilot bushing 20 is situation made of the formed products resin by making When formed weld line, parting line position be overlapped with the position of longitudinally through slot 23t, that is, along forming when be formed in guiding Weld line, the parting line of the external thread part 23 of bushing 20 form longitudinally through slot 23t, thus in the outer spiral shell of the pilot bushing 20 There is no the weld line, the parting lines that are formed when forming in line portion 23, therefore the sliding as caused by weld line, parting line hinders to disappear, The reduction of action can more reliably be inhibited.

[the 4th embodiment]

Figure 11 is the longitudinal section view for indicating the 4th embodiment of motor-driven valve according to the present invention.

Motor-driven valve 3 primarily longitudinal perforation of the motor-driven valve 4 of this 4th embodiment relative to above-mentioned third embodiment The shape of slot 23t is different, and other structures are roughly the same.Therefore, additional in part corresponding with each section of third embodiment Common symbol simultaneously omits repeated explanation, hereinafter, stressing to difference.

In the motor-driven valve 4 of present embodiment, referring to Fig.1 1, Figure 12 and Figure 13 it is found that the longitudinally through slot 23t by It is formed in the D cut surface composition that the external thread part 23 of the periphery of pilot bushing 20 is arranged, and the longitudinally through slot 23t (changes speech It, D cut surface) it is extended the upside (22 side of extended portion) of external thread part 23, and spread the circle of pilot bushing 20 The axes O direction (lifting direction) of the periphery (outside wall surface) of canister portion 21 and extended portion 22 is endlong formed.In this example, phase Axes O is set in opposite side (in other words, in the symmetrical position of axes O relative to pilot bushing 20) there are two the longitudinal direction Through slot 23t.

Like this, in the motor-driven valve of present embodiment 4, the longitudinally through slot 23t spreads the cylinder of pilot bushing 20 The axes O direction (lifting direction) of the periphery (outside wall surface) of portion 21 and extended portion 22 is endlong extended, in external screw thread The upside in portion 23, which is extended, abuts the part of (sliding contact) with the inner circumferential of the cylindrical portion 31 of valve shaft retainer 30, therefore removes Except the function and effect of above-mentioned third embodiment, effect effect identical with above-mentioned second embodiment certainly can be also obtained Fruit.

In addition, in the above-described embodiment, by the external thread part (fixed thread for being formed in pilot bushing 20 (periphery) Portion) it 23 and is formed in the internal thread part (movable threaded portion) 33 of valve shaft retainer 30 (inner circumferential) and constitutes for keeping spool 14 opposite In the feed screw mechanism 28 of valve seat 46a lifting, but without more speeches, fixed thread portion side can also be set as to internal thread part and will Movable threaded portion side is set as external thread part (for example, referring to above patent document 2).

In addition, in above-mentioned first and second embodiment, the internal thread part for being formed in valve shaft retainer 30 (inner circumferential) (can Dynamic threaded portion) 32 it is formed with longitudinally through slot 33t, it is in the above-described 3rd embodiment, (outer being formed in pilot bushing 20 Week) external thread part (fixed thread portion) 23 be formed with longitudinally through slot 23t, but as long as not hindering the elevating movement of valve shaft 10, It then can this be two rectangular at longitudinally through slot in internal thread part (movable threaded portion) and external thread part (fixed thread portion), it is not necessary in detail It is thin to describe.

In addition, in the above-described embodiment, being made with the resin system of PPS etc. with the outer spiral shell for being constituted feed screw mechanism 28 Line portion 23, the pilot bushing 20 of internal thread part 33, valve shaft retainer 30, but without more speeches, such as can also be with stainless steel, brass Deng metal be made.

In addition, in the above-described embodiment, to when spool 14 is in most down position (usually becoming full-shut position) The non-valve closing type in the gap (that is, spool 14 is not seated at valve seat 46a) of prescribed level is formed between spool 14 and valve seat 46a Motor-driven valve is illustrated, but for example in spool into the motor-driven valve for the type that valve seat is taken a seat, can also obtain with it is described identical Function and effect, it is not necessary in detail describe.

Claims (6)

1. a kind of motor-driven valve, has:

Valve shaft is equipped with spool in the valve shaft；

Pilot bushing, the valve shaft can relatively move in the axial direction and interior with the relative rotation can insert in the pilot bushing；

Valve body, the valve body have the valve port with valve seat, and the spool is contacted with the valve seat, separated, and the valve body Equipped with the pilot bushing；

Valve shaft retainer, the valve shaft retainer and the valve shaft link；

Shell, the shell are fixed on the valve body；

Motor, the motor are used to that the valve shaft retainer to be made to rotate relative to the pilot bushing, have rotor and stator, The rotor and the valve shaft retainer link；And

Feed screw mechanism, the feed screw mechanism are used to make based on the rotation driving of the rotor valve of the valve shaft Core is gone up and down relative to the valve seat of the valve body, is had and is set between the pilot bushing and the valve shaft retainer External thread part and internal thread part, the motor-driven valve be characterized in that,

At least one party in the external thread part and the internal thread part is equipped with the longitudinally through slot throughout lifting direction overall length.

2. motor-driven valve according to claim 1, which is characterized in that

The longitudinally through slot spreads the pilot bushing or the valve shaft equipped with the external thread part or the internal thread part The lifting direction of the wall surface of retainer is endlong extended.

3. motor-driven valve according to claim 1 or 2, which is characterized in that

The longitudinally through slot is made of the concavity face for being set to the internal thread part.

4. motor-driven valve described in any one of claim 1 to 3, which is characterized in that

The longitudinally through slot is made of the concavity face or D cut surface for being set to the external thread part.

5. motor-driven valve according to any one of claims 1 to 4, which is characterized in that

The longitudinally through slot is formed along the parting line or weld line of the external thread part or the internal thread part.

6. a kind of motor-driven valve, has:

Valve shaft is equipped with spool in the valve shaft；

Pilot bushing inserts in the pilot bushing in the valve shaft；

Valve body, the valve body have the valve port with valve seat, and the spool is contacted with the valve seat, separated, and the valve body Equipped with the pilot bushing；

Shell, the shell are set to the valve body；

Motor, which has rotor and stator, for rotating the valve shaft relative to the pilot bushing；And

Feed screw mechanism, the feed screw mechanism are used to make based on the rotation driving of the rotor valve of the valve shaft Core is gone up and down relative to the valve seat of the valve body, has external thread part and internal thread part, and the motor-driven valve is characterized in that,

At least one party in the external thread part and the internal thread part is equipped with the longitudinally through slot throughout lifting direction overall length.