CN107237913A

CN107237913A - Motor-driven valve and its assemble method

Info

Publication number: CN107237913A
Application number: CN201710100047.9A
Authority: CN
Inventors: 矢泽将志; 吉田龙也
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2016-03-28
Filing date: 2017-02-23
Publication date: 2017-10-10
Anticipated expiration: 2037-02-23
Also published as: JP6676432B2; CN111396618B; JP2017180525A; CN107237913B; KR102418034B1; KR102355654B1; CN111396618A; KR20220010759A; KR20170113208A

Abstract

A kind of motor-driven valve and its assemble method are provided, the changes in flow rate that the change of the flow direction of the adjoint fluid (refrigerant) when valve element is located at most down position can be suppressed and produced.When valve element (14) is located at most down position, at least a portion in the straight portion (14s) of valve element (14) side is overlapped with least a portion in the straight portion (46s) of seat portion (46a) side on lifting direction.

Description

Motor-driven valve and its assemble method

Technical field

Used the present invention relates to the kind of refrigeration cycle that air conditioner, refrigeration machine etc. are installed on as flow control valve etc. Motor-driven valve, more particularly to valve element be located at most down position (typically as full closing state) when, in valve element and seat portion Between formed prescribed level gap non-valve closing type motor-driven valve and its assemble method.

Background technology

As this motor-driven valve, such as a kind of known structure, it possesses：Valve shaft；With the interior cylindrical portion for being inserted with the valve shaft Guide rod；Keep and be fixed on the bottom of the valve shaft and the interior cylindric valve retainer for inserting in the guide rod；Valve element, should Valve element to insert in the valve retainer in the state that can relatively move and rotate against in axial direction relative to the valve shaft, and And the helical spring between valve element and the valve shaft is installed on by compression and exerted a force downwards, and pass through the valve retainer Carry out anticreep locking；Valve body, the valve body has the seat portion being separate with the valve element, and is mounted with described lead Bar；It is engaged in the housing of the valve body；It is configured at the rotor of the inner circumferential of the housing；Rotor retainer, the rotor retainer via The bonded block of the outer upper end for being fixed on the valve shaft links the rotor and the valve shaft；In order to be arranged at it is described The holding section of rotor engages and is formed at the recess of the rotor retainer；It is configured at for rotor described in rotation driving described The stator of the periphery of housing；It is configured at the interior threaded part of the cylindrical portion inner circumferential side of the guide rod；Feed screw mechanism, the screw thread Feed mechanism is formed from the fixation threaded portion of the inner circumferential of the interior threaded part and is formed at the movable spiral shell of the periphery of the valve shaft Line portion is constituted, and for separateing the valve element and the seat portion；And be configured at the guide rod cylindrical portion it is outer The rotation of week and the limitation rotor and the stop mechanism moved up and down, the stop mechanism is by with upside engaging portion and downside The spiral helicine fixed stop and ring-type of engaging portion or spiral helicine sliding part are constituted, and the ring-type or spiral helicine sliding part are set It is equipped with the first abutting part being abutting and locking with the upside engaging portion and be abutting and locking with the downside engaging portion second Abutting part, and the sliding part is assembled in the spiral part of the fixed stop, when the rotor rotates, by being arranged at this The pushing part of rotor promotes first abutting part, and the sliding part moved up and down until first abutting part in rotation Abutted with the upside engaging portion or second abutting part is abutted with the downside engaging portion, the second of the sliding part The origin position that abutting part is abutted and is stopped with the downside engaging portion, is formed between the valve element and the seat portion The gap of defined size (for example, referring to patent document 1).

In using the motor-driven valve with foregoing structure, even if valve element is located at most down position and (typically turned into Full closing state) when, the gap of prescribed level is also formed between valve element and seat portion, thus it is electronic with common valve closing type Valve is compared, and reliably valve element can be prevented to be engaged to seat portion, and with the case where the motor-driven valve is used in into air conditioner Prevent from operating not good advantage by what the burning of compressor was glued and produced.

Prior art literature

Patent document

Patent document 1：No. 5164579 publications of Japanese Patent Publication No.

Invent problem to be solved

But in the motor-driven valve of foregoing conventional non-valve closing type, the side of the valve chamber of refrigerant discrepancy valve body Second conduit of the bottom of the first conduit and refrigerant the discrepancy valve chamber in portion is linked by soldering etc. respectively to be fixed, fluid (refrigerant) is from the first conduit via a direction (positive direction) for valve chamber the second conduit of direction and from the second conduit via valve chamber court Flowed to other direction (opposite direction) of the first conduit the two directions, but (screw thread feeding machine is constituted in feed screw mechanism Between the fixation threaded portion and movable threaded portion of structure) backlash (thread pitch) is certainly existed, therefore when the stream of fluid (refrigerant) Dynamic direction from positive direction towards opposite direction or from opposite direction towards positive direction change when, by the pressure of the fluid to valve element force, The valve element is caused to be moved up and down (reference picture 7 (A), (B)) with the backlash (thread pitch) degree relative to seat portion.

Also, in above-mentioned conventional motor-driven valve, typically, control flows through the valve by flow of the fluid of valve port throttle orifice Core is made up of inverted cone table top or the rounding conical surface (conical surface).Therefore, following problem is produced：Due to the stream of fluid as described above Move the change in direction and cause valve element to be moved up and down relative to seat portion, then (be also referred to as most lower when valve element is located at origin position Decrease puts, for position that the umber of pulse that motor is supplied is 0 pulse) when, cause before and after the flow direction change of the fluid, Flow through valve port throttle orifice fluid by flow (also referred to as 0 pulse flow) change (reference picture 8).

Also, in above-mentioned conventional motor-driven valve, typically, in assembling during the origin position alignment of valve element, make valve element The conical surface abuts with seat portion and forms reference position, and makes valve element rise to enter relative to seat portion since the reference position The origin position alignment of row valve element.That is, the conical surface of valve element is the reference plane of the origin position alignment of valve element (referring in particular to patent text Offer 1 etc.).Therefore, the dimensional accuracy in the gap between the valve element and seat portion at origin position depends on the conical surface of valve element Parts precision (machining accuracy), all in all, the dimensional discrepancy in gap increase and discharge characteristic in centre (for example, open The flex point of flow under degree) there is the possibility for producing deviation.

The content of the invention

The present invention is made in view of the above problems, and its object is to provide a kind of motor-driven valve and its assemble method, energy The flow for enough suppressing the change of the flow direction of the adjoint fluid (refrigerant) when valve element is located at most down position and producing becomes Change.

Also, another object of the present invention is to provide a kind of motor-driven valve and its assemble method, it can suppress in origin position The dimensional discrepancy in the gap being formed between valve element and seat portion at the place of putting, and then the deviation of discharge characteristic can be suppressed.

Means for solving the problems

In order to solve above-mentioned problem, motor-driven valve involved in the present invention possesses：Valve shaft, the valve shaft is provided with valve element；Valve master Body, the valve body is provided with valve port throttle orifice and is formed with valve chamber, and the valve port throttle orifice has to be separate with the valve element Or close to remote seat portion, fluid is imported into the export valve chamber；Motor, the motor has what is linked with the valve shaft Rotor and the stator for rotating the rotor；Feed screw mechanism, the feed screw mechanism is by being arranged at the valve body The fixation threaded portion of side and the movable threaded portion composition for being arranged at the valve shaft side, and the feed screw mechanism is for according to described The rotation driving of rotor makes the valve element of the valve shaft be lifted relative to the seat portion of the valve body；And bottom Stop mechanism, the bottom stop mechanism, which is used to decline the rotation of the valve shaft, to be limited, when the valve element is by under described Portion's stop mechanism and during positioned at most down position, be formed with gap between the valve element and the seat portion, also, fluid from Positive direction of the valve chamber to the valve port throttle orifice and opposite direction the two sides from the valve port throttle orifice to the valve chamber To flowing, wherein, the valve element is provided with the straight portion in valve element side, the external diameter in the straight portion in valve element side is constant on lifting direction, The seat portion is provided with the straight portion in valve seat side, and the internal diameter in the straight portion in valve seat side is constant on lifting direction, also, the chi of each part Very little shape is set as follows：When the valve element be located at most down position when, at least a portion in the straight portion in valve element side with At least a portion in the straight portion in valve seat side is overlapped on lifting direction.

In preferred mode, the size shape of each part is set as follows：Decrease is most descended when the valve element is located at Put and the fluid to the opposite direction flow when, the weight of the straight portion in valve element side and the straight portion in valve seat side on lifting direction Resultant is 0, when the valve element, which is located at most down position and the fluid, flow to the positive direction, the straight portion in valve element side and Coincidence amount of the straight portion in valve seat side on lifting direction is the fixation threaded portion and movable threaded portion of the feed screw mechanism Between backlash degree.

In other preferred modes, the upside in the straight portion in valve element side of the valve element is provided with valve element side abutting Portion, the valve element side abutting part has the face vertical relative to lifting direction, when the valve element is compared under the most down position During drop, the valve element side abutting part of the valve element is abutted with the valve body.

In further preferred mode, valve element side abutting part is made up of the plane vertical relative to lifting direction, The valve body side abutting part abutted in planar fashion with valve element side abutting part is provided with the valve body.

Preferably, the seat portion and the valve port throttle orifice are formed in a part for the valve body.

Preferably, the seat portion and the valve port throttle orifice are formed at valve base part, and the valve base part interpolation is consolidated It is scheduled on the slotting embedding hole for the part for being formed at the valve body.

The assemble method of motor-driven valve involved in the present invention possesses：Valve shaft, the valve shaft is provided with valve element；Pilot bushing, should Pilot bushing has a cylindrical portion, and the valve shaft in the state that can relatively move and can rotate against in the axial direction to insert in The cylindrical portion；Valve body, the valve body is provided with valve port throttle orifice and is formed with valve chamber, and the valve port throttle orifice has and institute State valve element to separate or close to remote seat portion, fluid is imported into the export valve chamber, and the pilot bushing is installed It is fixed on the valve body；Valve shaft retainer, the valve shaft retainer has cylindrical portion and top, and links admittedly with the valve shaft Fixed, the cylindrical portion interpolation has the pilot bushing, and the top insertion is provided with inserting by the upper end insert of the valve shaft Through hole；Force application part, the force application part is clipped between the valve shaft and the valve shaft retainer, with to the valve element to valve closing Direction exerts a force；Motor, the motor has with the rotor of valve shaft retainer link and for making rotor rotation Stator, so that the valve shaft retainer rotates relative to the pilot bushing；Feed screw mechanism, the feed screw mechanism is by shape The fixation threaded portion of pilot bushing periphery described in Cheng Yu and the movable threaded portion composition for being formed at the valve shaft retainer inner circumferential, and The feed screw mechanism is used to make the valve element of the valve shaft relative to the valve master according to the rotation driving of the rotor The seat portion lifting of body；And bottom stop mechanism, the bottom stop mechanism stops by the fixation for being arranged at bottom retainer Kinetoplast and the movable stop-motion body composition for being arranged at the valve shaft retainer, are declined, institute with the rotation for limiting the valve shaft retainer The female threaded portion that there is bottom retainer the fixed threaded portion with the pilot bushing to be spirally connected is stated, when the valve element passes through institute When stating bottom stop mechanism and being located at most down position, gap, also, stream are formed between the valve element and the seat portion Body from the valve chamber to the positive direction of the valve port throttle orifice with from the valve port throttle orifice to the opposite direction of the valve chamber this Both direction flows, and in the assemble method of the motor-driven valve, the valve element of the motor-driven valve is provided with the straight portion in valve element side, should The external diameter in the straight portion in valve element side is constant on lifting direction, and the seat portion is provided with the straight portion in valve seat side, the straight portion in valve seat side Internal diameter is constant on lifting direction, also, is provided with valve element side abutting part on the upside of the straight portion in valve element side of the valve element, The valve element side abutting part has the face vertical relative to lifting direction, and the assemble method is included：The valve shaft not with it is described In the state of the link of valve shaft retainer is fixed, the bottom retainer can be screwed to the pilot bushing with the relative rotation and matched somebody with somebody Put in assigned position, be located at the valve shaft retainer by the bottom stop mechanism and most move down position, and make The process that the valve element declines compared to the most down position and makes valve element side abutting part be abutted with the valve body；Will The valve shaft links fixed process with the valve shaft retainer；And when the valve element is located at the most down position, with The mode that at least a portion in the straight portion in valve element side is overlapped with least a portion in the straight portion in valve seat side on lifting direction, The position that valve element side abutting part is abutted with the valve body makes positioned at the bottom of the assigned position as benchmark Retainer serves as a contrast the bottom retainer and the guiding to the valve opening position rotation regulation anglec of rotation relative to the pilot bushing The process that set links to rotate against.

Invention effect

According to the present invention, when valve element is located at most down position, each part is sized to, and is arranged at the valve of valve element At least a portion in valve seat side straight portion of at least a portion in the straight portion in core side with being arranged at seat portion is overlapped on lifting direction.More Specifically, when valve element is located at most down position and valve element farthest from seat portion (when being flowed in fluid to opposite direction), valve element At least a portion in the straight portion in side is overlapped with least a portion in the straight portion in valve seat side on lifting direction.Therefore, when valve element is located at most During down position, cause valve element to be moved up and down relative to seat portion even from the change of the flow direction of fluid, flow through valve Also continuously being changed by flow (0 pulse flow) for the fluid of mouth throttle orifice, the stream of valve port throttle orifice is flowed through with such as control The conventional motor-driven valve that the valve element by flow of body (refrigerant) is made up of the conical surface is compared, and can be reliably suppressed valve element and is located at The changes in flow rate of the flow direction change of adjoint fluid (refrigerant) during most down position.

Also, in the upside in the straight portion in valve element side of valve element, valve element side abutting part is provided with, the valve element side abutting part has phase For the vertical face in lifting direction, working as during the origin position alignment of the valve element in assembling makes the valve element most lower compared to described When decrease puts decline, the abutting part of the valve element is abutted with valve body.That is, the upside for being arranged at the straight portion in valve element side of valve element is supported Socket part (relative to the vertical face in lifting direction) constitutes the reference plane at the origin position alignment of valve element, the valve element of origin position with The dimensional accuracy in the gap between seat portion relies basically on the parts precision (machining accuracy) of the abutting part of valve element.Therefore, The conventional motor-driven valve of reference plane with being for example directed at the origin position of the conical surface of valve element as valve element is compared, can more added with Effect ground suppresses the dimensional discrepancy in the gap, and then can more efficiently suppress discharge characteristic (for example, under middle valve opening Flow flex point) deviation.Also, the straight portion in valve element side (length on lifting direction) is with abutting part (reference plane) Benchmark is determined, it is accordingly possible to ensure the dimensional accuracy in the straight portion in valve element side, also can be more efficiently for this point Suppress the deviation of discharge characteristic (for example, flex point of the flow under middle valve opening).

Brief description of the drawings

Fig. 1 represents the longitudinal section of an embodiment of motor-driven valve involved in the present invention.

Fig. 2 is that the pith of the pith enlarged representation of the motor-driven valve shown in Fig. 1 is amplified into longitudinal section, Fig. 2 (A) It is the figure for representing positive direction flow regime, Fig. 2 (B) is the figure for representing opposite direction flow regime.

Fig. 3 is the figure of one of the discharge characteristic for representing the motor-driven valve shown in Fig. 1.

Fig. 4 is other figure of the discharge characteristic for representing the motor-driven valve shown in Fig. 1.

Fig. 5 is to regard the pith amplification vertical profile of other pith enlarged representation of the motor-driven valve shown in Fig. 1 Figure.

Fig. 6 is to provide in the assembling procedure of the motor-driven valve shown in Fig. 1, is aligned in the origin position (most down position) of valve element In process, bottom retainer is set to be regarded relative to the top view and partial enlargement vertical profile of the explanation for the process that pilot bushing rotates Figure.

Fig. 7 is that the pith of the pith enlarged representation of conventional motor-driven valve is amplified into longitudinal section, and Fig. 7 (A) is The figure of positive direction flow regime is represented, Fig. 7 (B) is the figure for representing opposite direction flow regime.

Fig. 8 is the figure for the discharge characteristic for representing conventional motor-driven valve.

Symbol description

1 motor-driven valve

10 valve shafts

14 valve elements

14f ring-types tabular surface (valve element side abutting part)

The straight portion in 14s valve elements side

20 pilot bushings

21 cylindrical portions

23 fix threaded portion (male threaded portion)

28 feed screw mechanisms

29 bottom stop mechanisms

30 valve shaft retainers

33 movable threaded portions (female threaded portion)

40 valve bodies

40a valve chambers

41 first openings

The conduits of 41a first

42 second openings

The conduits of 42a second

45 base walls

45f ring-types tabular surface (main body side abutting part)

46 valve port throttle orifices

46a seat portions

The straight portion in 46s valve seats side

47 flanges

48 valve base parts

50 stepper motors

51 rotors

52 stators

55 housings

60 compression helical springs

70 anticreep locking member

O axis

Embodiment

Hereinafter, the embodiment referring to the drawings to motor-driven valve and its assemble method involved in the present invention is said It is bright.In addition, in order that the understanding to invention becomes easy and considers the convenience in drawing, in the various figures, the shape between part Into gap, the isolation distance between part have the situation that exaggeration is drawn.Also, in this manual, above and below expression, left and right equipotential Put, the description in direction is on the basis of direction arrow is represented in Fig. 1, without referring to position, direction under real use state.

Also, in this manual, by from the first conduit via valve chamber and valve port throttle orifice towards the direction of the second conduit As " positive direction ", using from the second conduit via valve port throttle orifice and valve chamber towards the direction of the first conduit as " opposite direction ", The side of first conduit and the valve chamber in valve body links, and the valve port throttle orifice is towards longitudinal direction and is formed at the valve chamber Bottom, the lower section of second conduit and valve chamber links.

(structure of motor-driven valve and action)

Fig. 1 is the longitudinal section for the embodiment for representing motor-driven valve involved in the present invention.

The motor-driven valve 1 of illustrated embodiment mainly possesses：Valve shaft 10；Pilot bushing 20；Valve shaft retainer 30；Valve body 40；Housing 55；The stepper motor 50 being made up of rotor 51 and stator 52；Compression helical spring (force application part) 60；Anticreep is locking Part 70；Feed screw mechanism 28；And bottom stop mechanism 29.

The valve shaft 10 since upside with top minor diameter part 11, middle large-diameter portion 12, bottom minor diameter part 13, and The bottom of its underpart minor diameter part 13 is integrally formed with valve element 14, and the valve element 14 is used to control to flow through valve port throttle orifice 46 Fluid (refrigerant) passes through flow.

It is well understood referring concurrently to Fig. 1 and Fig. 2, the valve element 14 has straight since upside (valve chamber 40a sides) Portion (the straight portion in valve element side) 14s, upside conical surface portion 14t, downside conical surface portion 14u, straight portion (the straight portion in the valve element side) 14s is by than valve shaft The slightly smaller barrel surface of 10 diameter of bottom minor diameter part 13 (being fixed in lifting direction top external diameter) is constituted, the upside conical surface portion 14t Be made up of inverted cone table top, the downside conical surface portion 14u by compared to upside conical surface portion 14t pilot angles (and with valve element 14 The angle of the crossing of the parallel line of heart axes O) big inverted cone table top constitutes.

Length on the lifting direction (above-below direction) of the straight portion 14s is designed to be more than (the structure of feed screw mechanism 28 Into between the fixation threaded portion 23 and movable threaded portion 33 of feed screw mechanism 28) backlash (thread pitch) degree (detailed feelings Condition is aftermentioned).

Also, the upside (being connected with the straight portion 14s) of the straight portion 14s in valve element 14, is provided with ring-type tabular surface (level Face) (valve element side abutting part) 14f, the bottom minor diameter part 13 and valve element 14 that ring-type tabular surface 14f is formed from valve shaft 10 be (straight Portion 14s) between step surface constitute.Ring-type tabular surface 14f is the face vertical relative to lifting direction, and is somebody's turn to do in assembling During origin position (most down position) alignment of the valve element 14 during motor-driven valve 1, when the valve element 14 declines compared to most down position With valve body 40 (specifically, be formed at the base wall 45 of valve body 40 upper surface as valve body side abutting part Ring-type tabular surface 45f) abut reference plane (details is aftermentioned).

The pilot bushing 20 has cylindrical portion 21 and an extension 22, and the valve shaft 10 (in the middle of large-diameter portion 12) is can The cylindrical portion 21 is inserted in in the state of (slip) is relatively moved on axes O direction and can be rotated against around axes O, this prolongs Extending portion 22 extends upward from the upper end of the cylindrical portion 21, and internal diameter is big compared to the internal diameter of the cylindrical portion 21, and interior is inserted with The upper end side of the middle large-diameter portion 12 of the valve shaft 10 and the lower end side of top minor diameter part 11.In the cylinder of the pilot bushing 20 The periphery in portion 21 is formed with fixed threaded portion (male threaded portion) 23, and the fixation threaded portion 23 constitutes the rotation driving according to rotor 51 To make a side of the valve element 14 relative to the seat portion 46a of valve body 40 feed screw mechanisms 28 lifted of the valve shaft 10.And And, the bottom (than the part of the fixed lower side of threaded portion 23) of the cylindrical portion 21 is mutually chimeric with the embedded hole 44 of valve body 40 Big footpath fitting portion 27.In the fixed threaded portion 23 (in than the lower side of valve shaft retainer 30), the spiral shell of bottom retainer 25 Fastening be set to the upper surface 27a of fitting portion 27 vacate as defined in gap h, and integratedly dashed forward in the periphery of the bottom retainer 25 Go out to be provided with fixed stop body 24, the fixed stop body 24 is constituted (that is, to be linked to valve shaft retainer 30 with valve shaft retainer 30 Valve shaft 10) rotation decline the side of bottom stop mechanism 29 limited.In addition, as will be described later, in this embodiment party In formula, the upper surface 27a of fitting portion 27 is that the decline to bottom retainer 25 is limited (in other words, regulation bottom retainer 25 decline limit positions most move down position) retainer.

The valve shaft retainer 30 has cylindrical portion 31 and top 32, and the interpolation of cylindrical portion 31 has the pilot bushing 20, The insertion of top 32 is provided with by the inserting hole 32a of the upper end insert of the valve shaft 10 (top minor diameter part 11).Described The inner circumferential of the cylindrical portion 31 of valve shaft retainer 30 is formed with movable threaded portion (female threaded portion) 33, the movable threaded portion 33 with it is described The fixation threaded portion 23 of pilot bushing 20 screws togather and constitutes the feed screw mechanism 28, and in the valve shaft retainer 30 The periphery lower end of cylindrical portion 31 has integratedly been provided projectingly movable stop-motion body 34, and the movable stop-motion body 34 constitutes the bottom stop The opposing party of mechanism 29.

Also, the step surface being formed between the top minor diameter part 11 of the valve shaft 10 and middle large-diameter portion 12 with it is described The mode for the top minor diameter part 11 for being inserted in valve shaft 10 beyond between the lower surface at the top 32 of valve shaft retainer 30, which is compressed, to be equipped with Compression helical spring (force application part) 60, the compression helical spring 60 is being risen to making the valve shaft 10 and the valve shaft retainer 30 Direction force remote on direction (axes O direction), in other words, 60 pairs of compression helical spring valve shaft 10 (valve element 14) drop Always (valve closing direction) exerts a force downwards.

The valve body 40 is made up of the metal rounding cylinder such as brass, SUS.The valve body 40 has valve chamber 40a, Fluid is imported and exported in valve chamber 40a inside, the first conduit 41a passes through the modes such as soldering and the sidepiece for being arranged at valve chamber 40a Laterally first opening 41 link fix, inserting hole 43 and embedded hole 44, the valve shaft are formed with the top of valve chamber 40a 10 (in the middle of large-diameter portions 12) on axes O direction can relatively move (slip) and the shape that can be rotated against around axes O The inserting hole 43 is inserted through under state, is fitted together in the embedded hole 44 and is mounted with the bottom (fitting portion of the pilot bushing 20 27), the second conduit 42a is linked by the opening of longitudinal direction second 42 of the modes such as soldering and the bottom for being arranged at valve chamber 40a and fixed. Also, it is formed with the valve of substantially circular cone shape in the base wall 45 being arranged between the valve chamber 40a and second opening 42 Mouth throttle orifice 46, the valve port throttle orifice 46, which has, to be separate with the valve element 14 or close to remote seat portion 46a, and Seat portion 46a is provided with straight portion (the straight portion in valve seat side) 46s (reference picture 2).

The straight portion 46s (internal diameter) is more slightly larger than the straight portion 14s of the valve element 14 diameter, also, the straight portion 46s quilts It is designed as smaller than the diameter of the bottom minor diameter part 13 of the valve shaft 10.

Also, it is ring-type around the valve port throttle orifice 46 (seat portion 46a) of the upper surface of the bottom wall part 45 of valve body 40 Tabular surface (horizontal plane) (valve body side abutting part) 45f, ring-type tabular surface 45f is the valve element 14 when assembling the motor-driven valve 1 Origin position (most down position) alignment when the bearing surface (reference plane) that is abutted with the ring-type tabular surface 14f planes of the side of valve element 14 (details is aftermentioned).

In addition, being fixed with flange shape plate 47 by riveting etc. in the upper end of the valve body 40, and it is being arranged at this The stage portion of the periphery of flange shape plate 47 is sealingly engaged the bottom of the cylindric housing 55 with top by jam weld.

In the outside of the inner side of the housing 55 and the pilot bushing 20 and the valve shaft retainer 30, rotate freely Ground is configured with rotor 51, in the outside of the housing 55, is configured with the stator 52 of rotor 51 described in rotation driving, the stator 52 by Yoke 52a, bobbin 52b, stator coil 52c and resin molded shell 52d etc. are constituted.It is connected with stator coil 52c many Individual binding post 52e, multiple wiring 52g are connected with these binding posts 52e via substrate 52f, be thus configured to by Stator coil 52c energizations excitation makes the rotor 51 being configured in housing 55 be rotated around axes O.

The engaging of the rotor 51 being configured in housing 55 is supported on the valve shaft retainer 30, and the valve shaft retainer 30 It is configured to (integratedly) rotate together with the rotor 51.

More specifically, the rotor 51 is the double tubular construction being made up of inner cylinder 51a, outer barrel 51b, connecting portion 51c, should Connecting portion 51c around the connection of the defined angle position of axes O inner cylinder 51a and outer barrel 51b, inner cylinder 51a inner circumferential (for example, Around axes O with 120 ° of angle interval) it is formed with the pod 51d extended along axes O direction (above-below direction).

In addition, in the periphery (top half) of the valve shaft retainer 30, (for example, around axes O between hexagonal angle degree Every) the ridge 30a that extends along above-below direction is provided projectingly, it is formed with that supporting is described to be turned in ridge 30a bottom both sides The locking side (not shown) upward of son 51.

The inner cylinder 51a of rotor 51 pod 51d and valve shaft retainer 30 ridge 30a engagings, also, pass through rotor 51 Inner cylinder 51a lower surface is abutted with the locking side of valve shaft retainer 30, so that rotor 51 is positioned relative to valve shaft retainer 30 In the state of be supported by fix.Described one side of valve shaft retainer 30 supporting rotor 51 in the housing 55, while with this Rotor 51 rotates together.

Anticreep locking member 70 is configured with the upside of the rotor 51 and valve shaft retainer 30, the anticreep locking member 70 are made up of pushing nut 71 with rotor pressing component 72, the pushing nut 71 by press-in, welding etc. it is outer be fixed on it is described The upper end of valve shaft 10 (top minor diameter part 11), to prevent the relative shifting of valve shaft retainer 30 and rotor 51 on lifting direction Dynamic (in other words, rotor 51 is pressed downwards relative to valve shaft retainer 30) simultaneously links valve shaft 10 and valve shaft retainer 30, should Rotor pressing component 72 is between the pushing nut 71 and rotor 51, by forming what is inserted for the upper end of valve shaft 10 in center Inserting hole 72a disk-like member is constituted.That is, described rotor 51 be clamped in by the force of compression helical spring 60 by Between the valve shaft retainer 30 and the rotor pressing component 72 of top force.In addition, from the upper end of valve shaft retainer 30 to card (above-below direction) untill determining face is highly identical highly with the inner cylinder 51a of rotor 51 (above-below direction), valve shaft retainer The upper surface at 30 (tops 32) is abutted with the lower surface (tabular surface) of the rotor pressing component 72.

Also, it is outer equipped with by valve shaft retainer 30 in the pushing nut 71 for being fixed on the upper end of the valve shaft 10 The recovery spring 75 that the helical spring exerted a force to the side of pilot bushing 20 is constituted, the recovery spring 75 prevents that valve shaft is kept in action Frame 30 relative to pilot bushing 20 upward excessive movement and cause the fixation threaded portion 23 of pilot bushing 20 and valve shaft retainer 30 movable threaded portion 33 screws togather dropout.

Also, in the motor-driven valve 1, when valve element 14 is located at most down position (origin position), in valve element 14 and valve seat The gap of prescribed level is formed between portion 46a to prevent that for example valve element 14 bites to seat portion 46a, and ensure in low flow volume region Controlling.In this example, between the straight portion 46s of the base wall 45 of the straight portion 14s of valve element 14 and valve body 40, and with straight portion Between the ring-type tabular surface 14f of 14s connections and the ring-type tabular surface 45f being connected with straight portion 46s, the gap of prescribed level is formed.

In the motor-driven valve 1 of the structure, when by revolving rotor 51 to stator 52 (stator coil 52c) energization excitation When turning, rotated with the valve shaft retainer 30 and valve shaft 10 of the one of rotor 51.Now, the fixation screw thread by pilot bushing 20 is passed through Feed screw mechanism 28 that the movable threaded portion 33 of portion 23 and valve shaft retainer 30 is constituted makes valve shaft 10 be lifted in company with valve element 14, Thus, increase and decrease the gap (lift, valve opening) between valve element 14 and seat portion 46a, so as to adjust the fluids such as refrigerant Pass through flow.Even if also, when valve shaft retainer 30 movable stop-motion body 34 and be fixed on the bottom retainer of pilot bushing 20 25 fixed stop body 24 is abutted, when valve element 14 is located at most down position, between being formed between valve element 14 and seat portion 46a Gap (requires lift) during valve closing, can also ensure that ormal weight by flow (reference picture 3).

However, in the motor-driven valve 1 of present embodiment, fluid (refrigerant) flows to twocouese, specifically, fluid from First conduit 41a (the first opening 41) is via valve chamber 40a and valve port throttle orifice 46 to the second conduit 42a's (the second opening 42) Direction (that is, horizontal → lower direction) (following, the state is referred to as positive direction flow regime) and from the second conduit 42a (the second openings 42) via valve port throttle orifice 46 and valve chamber 40a to the direction (that is, under → transverse direction) of the first conduit 41a (the first opening 41) (following, the state is referred to as opposite direction state) the two directions flowing, according to the pressure of the fluid, in positive direction flowing Under state, valve element 14 is exerted a force downwards, and under the opposite direction flow regime, valve element 14 is exerted a force upward.Also, make In the feed screw mechanism 28 that valve element 14 is lifted relative to seat portion 46a, kept in the valve shaft linked with valve element 14 (valve shaft 10) Between the movable threaded portion 33 of frame 30 and the fixation threaded portion 23 of pilot bushing 20 for linking fixation with valve body 40, there is backlash (thread pitch).Therefore, under the positive direction flow regime, valve element 14 is (until the movable threaded portion 33 of valve shaft retainer 30 Lower face side contacted with the upper surface side of the fixation threaded portion 23 of pilot bushing 20 untill) move (Fig. 2 (A) institute table downwards The state shown), under the opposite direction flow regime, valve element 14 is (until the upper table in the movable threaded portion 33 of valve shaft retainer 30 Untill surface side is contacted with the lower face side of the fixation threaded portion 23 of pilot bushing 20) it is moved upward (the shape represented by Fig. 2 (B) State).That is, opposite direction is turned to or during from changing inversely to positive direction when the flow direction of fluid (refrigerant) becomes from positive direction, Valve element 14 is moved up and down relative to seat portion 46a with the degree of the backlash.

Here, in the present embodiment, the size shape of each part is set in such a way：When valve element 14 is positioned at most lower When decrease is put, the straight portion 14s of the side of valve element 14 at least a portion and the straight portion 46s of seat portion 46a sides at least a portion are rising Drop and overlap (overlapping) on direction (above-below direction).More specifically, length quilts of the straight portion 14s in lifting direction (above-below direction) It is designed as the tooth of feed screw mechanism 28 (between the fixation threaded portion 23 and movable threaded portion 33 that constitute feed screw mechanism 28) It is more than gap degree, (opposite direction flow regime), valve when valve element 14 is located at most down position and valve element 14 farthest from seat portion 46a The straight portion 14s of the side of core 14 lower portion is only overlapped with the straight portion 46s of seat portion 46a sides upper portion on lifting direction Coincidence amount (lap) Lmin (state shown in Fig. 2 (B)).

And in this case, under positive direction flow regime, the straight portion 14s and seat portion 46a sides of the side of valve element 14 it is straight Coincidence amount Lmaxs of the portion 46s on lifting direction turns into the coincidence amount Lmin plus the backlash degree of feed screw mechanism 28 Measure (state shown in Fig. 2 (A)).

Therefore, as shown in figure 3, when valve element 14 is located at most down position, even if the flow direction of fluid is from positive direction court Cause valve element 14 to be moved up and down relative to seat portion 46a to opposite direction or from opposite direction towards positive direction change, flow through valve port Also continuously being changed by flow (0 pulse flow) for the fluid of throttle orifice 46, the stream of valve port throttle orifice is flowed through with such as control The conventional motor-driven valve that the valve element by flow of body (refrigerant) is made up of the conical surface is compared, when valve element 14 is located at most down position When, the changes in flow rate changed with the flow direction of fluid (refrigerant) can be reliably suppressed.

Also, in the present embodiment, it is provided with ring-type tabular surface on the upside of the straight portion 14s of valve element 14 (valve element side is supported Socket part) 14f, ring-type tabular surface 14f has relative to the vertical face in lifting direction, also, in the base wall 45 of valve body 40 Upper surface valve port throttle orifice 46 (seat portion 46a) around be provided with ring-type tabular surface (valve body side abutting part) 45f, at this During origin position (most down position) alignment of the valve element 14 when motor-driven valve 1 is assembled, when making the valve element 14 compared to most declining When position declines, the ring-type tabular surface 14f of the side of valve element 14 is abutted with the ring-type tabular surface 45f of the side of valve body 40.That is, it is arranged at valve The ring-type tabular surface 45f of ring-type tabular surface 14f and valve body 40 on the upside of the straight portion 14s of core 14 constitute the origin position of valve element 14 The dimensional accuracy for putting the gap between the valve element 14 at the reference plane of alignment, origin position and seat portion 46a is relied basically on The ring-type tabular surface 14f of valve element 14 parts precision (machining accuracy) (details is aftermentioned).Therefore, with for example by the cone of valve element The conventional motor-driven valve for the reference plane that face is aligned as the origin position of valve element is compared, and can more efficiently suppress the gap Dimensional discrepancy, and then can more efficiently suppress discharge characteristic (for example, flex point of the flow under middle valve opening) Deviation.Also, length of the straight portion 14s of the side of valve element 14 on lifting direction is with ring-type tabular surface 14f (reference plane) for base Standard is determined, it is accordingly possible to ensure the straight portion 14s of the side of the valve element 14 dimensional accuracy, also can be more for this point Effectively suppress the deviation of discharge characteristic (for example, flex point of the flow under middle valve opening).

In addition, in the example shown in Fig. 3, under the opposite direction flow regime that valve element 14 is exerted a force upward, valve element 14 The straight portion 14s of side lower portion only overlaps as regulation with the straight portion 46s of seat portion 46a sides upper portion on lifting direction Coincidence amount Lmin, but for example shown in Fig. 4, under the opposite direction flow regime, the size shape of each several part can also be set It is set to, the straight portion 14s of the side of valve element 14 bottom is consistent (that is, in lifting side with the straight portion 46s of seat portion 46a sides upper end 0) upward coincidence amount Lmin is.In this case, in the state of positive direction flowing, the straight portion 14s and seat portion 46a of the side of valve element 14 Straight portion 46s lifting direction on coincidence amount Lmax turn into feed screw mechanism 28 backlash degree.

Also, in the above-described embodiment, the ring-type tabular surface 14f of the side of valve element 14 and the ring-type tabular surface of the side of valve body 40 45f is configured to plane abutting, but can also be configured to the abutment beyond plane, for example, it is also possible to by the side of valve element 14 The ring-type tabular surface 14f and ring-type tabular surface 45f of the side of valve body 40 side or two sides is configured to section overshooting shape.

Also, valve port throttle orifice 46 in the above-described embodiment, is formed with the base wall 45 of valve body 40, the valve port section Discharge orifice 46 has the seat portion 46a for being provided with straight portion 46s, but can also for example shown in Fig. 5, be made by machining etc. Valve base part 48, the valve base part 48 is formed with valve port throttle orifice 46, and the valve port throttle orifice 46 has the valve for being provided with straight portion 46s Portions 46a, the interpolation of valve base part 48 is fixed on the slotting embedding hole 49 for the base wall 45 for being arranged at valve body 40.In this case, It is ring-type tabular surface (horizontal plane) (valve body side around the valve port throttle orifice 46 (seat portion 46a) of the upper surface of valve base part 48 Abutting part) 48f, with valve element 14 when the origin position (most down position) of the valve element 14 when being formed in the motor-driven valve 1 assembling is aligned The bearing surface (reference plane) that the ring-type tabular surface 14f planes of side are abutted.

As shown in figure 5, by using the part valve base part 48 with the split of valve body 40, improving the part of valve base part 48 Precision, particularly improves straight portion 46s, ring-type tabular surface 48f dimensional accuracy etc., special so as to more efficiently suppress flow The deviation of property.

(assemble method of motor-driven valve)

As one side reference picture 1 and Fig. 2 while one of assembling procedure to said electric valve 1, particularly to valve element 14 One of origin position (most down position) alignment process when carrying out general description, first have to valve shaft 10, pilot bushing 20, Bottom retainer 25, compression helical spring 60, valve shaft retainer 30, rotor 51, valve body 40 etc. are installed.Now, under making Portion's retainer 25 screws togather to rotate against relative to pilot bushing 20.In addition, in the stage, bottom retainer 25 can be with leading Configuration is abutted to the retainer 27a of bushing 20, can also be with retainer 27a configurations spaced apart.Then, it is arranged at valve shaft 10 The valve element 14 of bottom abut that (that is, the ring-type of the ring-type tabular surface 14f and valve body 40 of valve element 14 are flat with seat portion 46a Face 45f is abutted), compression helical spring 60 somewhat compresses, movable stop-motion body 34 and the bottom retainer 25 of valve shaft retainer 30 Fixed stop body 24 is abutted, also, is until bottom retainer 25 (lower surface) is abutted with the retainer 27a of pilot bushing 20 Only, the screw thread constituted using the movable threaded portion 33 by the fixation threaded portion 23 of pilot bushing 20 and valve shaft retainer 30 feeds machine Structure 28 makes the valve shaft retainer 30, rotor 51 and the valve shaft 10 rotate while declining.Also, protected in this valve shaft Hold frame 30 and be located at and most move down position, and valve element 14 declines and its ring-type tabular surface 14f and valve compared to most down position In the state of the ring-type tabular surface 45f of main body 40 is abutted, rotor pressing component 72 is embedded in the upper end of valve shaft 10 and is passed through The outer fixed pushing nut 71 such as press-in, welding.

Then, since above-mentioned state, using the feed screw mechanism make valve shaft 10, valve shaft retainer 30, rotor 51, The assembly of the one such as anticreep locking member 70 (push nut 71 and rotor pressing component 72) rotate while rise and from After pilot bushing 20 is removed, make bottom retainer 25 relative to pilot bushing 20 to valve opening position (be in master in example illustrated Rotate counterclockwise in view) the rotation regulation anglec of rotation.Then, the bottom retainer 25 is being passed through into welding, deposition, bonding etc. Link with pilot bushing 20 (fixation threaded portion 23) and be fixed as after can not rotating against, reusing feed screw mechanism 28 will The assembly is installed to pilot bushing 20.Accordingly, because the fixed stop body 24 of bottom retainer 25 is oppositely oriented bushing 20 Position change, so being supported even in the movable stop-motion body 34 of valve shaft retainer 30 with the fixed stop body 24 of bottom retainer 25 Connect, valve shaft retainer 30 is located at when most moving down position (that is, when valve element 14 is located at most down position), also in valve element 14 and valve Gap (gap that size is H on lifting direction under positive direction flow regime) (reference of prescribed level is formed between portions 46a Fig. 2 (A)).Now, overlap amount Lmaxs of the straight portion 14s of the side of valve element 14 with the straight portion 46s of seat portion 46a sides in lifting direction is The backlash degree of such as feed screw mechanism 28.In addition, though to making the assembly rise and be removed from pilot bushing 20 Afterwards, bottom retainer 25 is made only to rotate the regulation anglec of rotation to valve opening position relative to pilot bushing 20, and by the bottom stop Part 25 links the process for being fixed as rotating against by welding, deposition, bonding etc. and pilot bushing 20 and is illustrated, but It is, if the gap of following degree can be formed：The assembly is only set to increase relative to pilot bushing 20, it becomes possible to stop bottom Moving part 25 only rotates the regulation anglec of rotation to valve opening position relative to pilot bushing 20 and can pass through bottom retainer 25 Welding, deposition, bonding etc. link with pilot bushing 20 to be fixed as rotating against, then need not be served as a contrast the assembly from guiding Set 20 is removed.

In addition, being adopted in the fixation threaded portion (male threaded portion) 23 of the female threaded portion 26 of bottom retainer 25, pilot bushing 20 In the case of with the threaded portion without backlash type, chi of the gap between valve element 14 and seat portion 46a on lifting direction is formed at Very little H and bottom retainer 25 (lower surface) are consistent or substantially uniform with the retainer 27a of pilot bushing 20 gap h.But, In general, being provided with backlash (clearance or gap) in threaded portion.Therefore, as embodiment described above, bottom retainer is made After 25 abut and are tightened with the retainer 27a of pilot bushing 20, rotated (release) to valve opening position making bottom retainer 25 And in the case of carrying out the origin position alignment of valve element 14, the bottom retainer 25 is kept with being oriented in the initial period of rotation State (that is, the not rising) rotation that the retainer 27a of bushing 20 is abutted, therefore the size H and gap h not necessarily one Cause.

Reference picture 6 is to be more clearly understood from, specifically, is served as a contrast by the female threaded portion 26 of bottom retainer 25 with being oriented to The anglec of rotation of backlash degree between the fixation threaded portion 23 of set 20 is set to θ b [°] (in the example in the figures, about 180 °) In the case of, in above-mentioned origin position alignment process, abutted from bottom retainer 25 is made with the retainer 27a of pilot bushing 20 And state (in a state, the upper surface side of female threaded portion 26 of bottom retainer 25 and the consolidating for pilot bushing 20 being tightened Determine the lower face side contact of threaded portion 23) start, when making the bottom retainer 25 rotate (release) to valve opening position, in backlash In the range of the anglec of rotation θ b [°] of degree, due to deadweight, the stop of bottom retainer 25 (lower surface) and pilot bushing 20 Portion 27a is constantly abutted (Fig. 6 (1)~(3)).But, bottom retainer 25 itself rotation, thus it is arranged at the bottom stop The rotation position of the fixed stop body 24 of part 25 changes.

If, bottom retainer 25 is fixed on pilot bushing in the range of the anglec of rotation θ b [°] of the backlash degree 20, rotate valve shaft retainer 30 using feed screw mechanism 28 while declining, when making the movable of valve shaft retainer 30 When stop-motion body 34 is abutted with the fixed stop body 24 of bottom retainer 25, valve shaft retainer 30 most moves down position under The rotation amount of portion's retainer 25 is gradually increasing.For example, the female threaded portion 26 of bottom retainer 25 ridge away from (between thread Interval) when being p, p × θ is defined as in the offset ascending amount Hb for most moving down position of the valve shaft retainer 30 of time point of backlash B/360 (Fig. 6 (3)).

After backlash offsets (anglec of rotation of bottom retainer 25 reaches the anglec of rotation θ b [°] of backlash degree afterwards) ( In the state, the lower face side of the female threaded portion 26 of bottom retainer 25 and the upper surface of the fixation threaded portion 23 of pilot bushing 20 Side contacts), when making bottom retainer 25 further be rotated to valve opening position, bottom retainer 25 is rotated on while starting Rise, and the formation gap h between bottom retainer 25 and the retainer 27a of pilot bushing 20.

Finally, since being made bottom retainer 25 and the state that the retainer 27a of pilot bushing 20 is abutted and is tightened, when When making bottom retainer 25 to valve opening position only rotation angles degree θ b [°] and being fixed on pilot bushing 20, valve shaft retainer 30 The position that most moves down only rise the ascending amount H for being defined as p × θ b/360, therefore most descend decrease when valve shaft retainer 30 is located at When putting (that is, when valve element 14 is located at most down position), formed between valve element 14 and seat portion 46a in (positive direction flow regime Under) given size H gap (reference picture 2 (A)) is formed with lifting direction.On the other hand, in bottom retainer 25 with leading The gap h after backlash degree is subtracted from the ascending amount H to being formed between the retainer 27a of bushing 20, that is, formed by p × (θ-θ b)/gap h as defined in 360.

In addition, in the illustrated embodiment, by making the rotation of bottom retainer 25 more than the anglec of rotation θ of backlash degree B [°] and gap h is formed between bottom retainer 25 and the retainer 27a of pilot bushing 20, but due to being formed at valve element 14 In the case that gap between seat portion 46a is sized to above-mentioned below Hb on lifting direction, bottom retainer If 25 rotate in the range of the anglec of rotation θ b [°] of backlash, therefore in bottom retainer 25 and pilot bushing 20 Gap is not formed between retainer 27a, bottom retainer 25 (lower surface) keeps abutting with the retainer 27a of pilot bushing 20 State.

Also, bottom retainer 25 in the above-described embodiment, will be made to be abutted with the retainer 27a of pilot bushing 20 and by The normal condition that the state tightened rotates as bottom retainer 25 to valve opening position, it may be evident, however, that under the normal condition The tightening state of bottom retainer 25, position in the vertical direction are not limited to the present embodiment of diagram.For example, bottom is stopped Moving part 25 can also regard the free position in the rotation angle range of the backlash degree shown in Fig. 6 (1)~(3) as base Quasi- state.Also, the bottom retainer 25 is not necessarily to abut with the retainer 27a of pilot bushing 20 under its normal condition, For example as shown in Fig. 6 (4), the optional position on bushing 20 (fixation threaded portion 23) can be directed to as normal condition. In addition, being used as the benchmark shape in the state that bottom retainer 25 is separated with the retainer 27a of pilot bushing 20 and (do not abutted) In the case of state, above-mentioned backlash is not present, and after finishing assembly, the gap being formed between valve element 14 and seat portion 46a exists Size H on lifting direction becomes smaller than the gap h of bottom retainer 25 (lower surface) and the retainer 27a of pilot bushing 20 (in other words, gap hs of the retainer 27a of bottom retainer 25 and pilot bushing 20 on lifting direction becomes than the size H Greatly).

In the motor-driven valve 1 assembled by the assemble method, as described above, when by (the stator coil of stator 52 52c) energization excitation when rotating rotor 51, rotates valve shaft retainer 30 and valve shaft 10 with the one of rotor 51.Now, The feed screw mechanism being made up of the movable threaded portion 33 by the fixation threaded portion 23 of pilot bushing 20 and valve shaft retainer 30 28 make valve shaft 10 be lifted in company with valve element 14, thus, make the gap (lift, valve opening) between valve element 14 and seat portion 46a Increase and decrease, thus adjust the fluids such as refrigerant by flow.Even if also, when the movable stop-motion body 34 of valve shaft retainer 30 is with consolidating Fixed stop body 24 due to the bottom retainer 25 of pilot bushing 20 is abutted, when valve element 14 is located at most down position, due to valve Gap (lift is required during valve closing) is formed between core 14 and seat portion 46a, (joining by flow for ormal weight is can also ensure that According to Fig. 3).

In the motor-driven valve 1 of present embodiment, with ridge, the bottom retainer 25 of the female threaded portion 26 away from p is being oriented to The assigned position of bushing 20 is screwed togather as that can rotate against, because of bottom stop mechanism 29 so as to which valve shaft retainer 30 is located at most to moving down Dynamic position, also, valve element 14 is declined compared to most down position so that the ring-type tabular surface 14f and valve body 40 of valve element 14 Ring-type tabular surface 45f abut, thereafter, the ring-type tabular surface 14f of valve element 14 is abutted with the ring-type tabular surface 45f of valve body 40 Position as benchmark, the bottom retainer 25 positioned at the assigned position is only revolved to valve opening position relative to pilot bushing 20 Turn predetermined angular θ and link to rotate against with the pilot bushing 20, then because of bottom stop mechanism 29 so as to which valve shaft is protected Hold frame 30 to be located at when most moving down position, (specifically, ring-type tabular surface 14f and ring between valve element 14 and seat portion 46a Between shape tabular surface 45f), the gaps as defined in p × θ/360 of the size H under positive direction flow regime on lifting direction are formed, Also, the straight portion 14s of valve element 14 at least a portion and seat portion 46a straight portion 46s at least a portion are on lifting direction Overlap.That is, by making bottom stop after bottom retainer 25 is rotated relative to pilot bushing 20 to valve opening position Part 25 links to rotate against with the pilot bushing 20, to provide the most decline of the valve element 14 under positive direction flow regime Position, in other words, come provide when valve element 14 be located at most down position when valve element 14 and seat portion 46a between lifting direction on Gap.That is, the dimensional accuracy in the gap between the valve element 14 and seat portion 46a of origin position relies basically on composition bottom and stopped The dimensional accuracy of the female threaded portion 26 of the bottom retainer 25 of motivation structure 29 and the fixation threaded portion 23 of pilot bushing 20, therefore energy Enough suppress the dimensional discrepancy in the gap, additionally it is possible to improve the controlling of fluid (refrigerant) flow of low flow volume region.In addition, Made by the ring-type tabular surface 14f of the upside of the straight portion 14s by valve element 14 is arranged at and the ring-type tabular surface 45f of valve body 40 The reference plane of origin position alignment when being assembled for valve element 14, gap between the valve element 14 and seat portion 46a of origin position Dimensional accuracy relies basically on the ring-type tabular surface 14f of valve element 14 parts precision (machining accuracy), so as to effectively Suppress the dimensional discrepancy in the gap, and then can more efficiently suppress discharge characteristic (for example, the stream under middle valve opening The flex point of amount) deviation.

Claims

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

Valve shaft, the valve shaft is provided with valve element；

Valve body, the valve body is provided with valve port throttle orifice and is formed with valve chamber, and the valve port throttle orifice has and the valve element It separate or close to remote seat portion, fluid is imported into the export valve chamber；

Motor, the motor has with the rotor of valve shaft link and the stator for rotating the rotor；

Feed screw mechanism, the feed screw mechanism is by being arranged at the fixation threaded portion of the valve body side and being arranged at the valve The movable threaded portion of axle side is constituted, and the feed screw mechanism is used to make the valve shaft according to the rotation driving of the rotor The valve element is lifted relative to the seat portion of the valve body；And

Bottom stop mechanism, the rotation that the bottom stop mechanism is used for the valve shaft, which declines, to be limited,

When the valve element is located at most down position by the bottom stop mechanism, between the valve element and the seat portion Be formed with gap, also, fluid from the valve chamber to the positive direction of the valve port throttle orifice with from the valve port throttle orifice to The two directions of the opposite direction of the valve chamber are flowed, and the motor-driven valve is characterised by,

The valve element is provided with the straight portion in valve element side, the external diameter in the straight portion in valve element side is constant on lifting direction, in the valve seat Portion is provided with the straight portion in valve seat side, and the internal diameter in the straight portion in valve seat side is constant on lifting direction,

Also, the size shape of each part is set as follows：When the valve element is located at most down position, the valve element side The straight at least a portion in portion is overlapped with least a portion in the straight portion in valve seat side on lifting direction.

2. motor-driven valve according to claim 1, it is characterised in that

The size shape of each part is set as follows：

When the valve element, which is located at most down position and the fluid, to be flowed to the opposite direction, the straight portion in valve element side with it is described Coincidence amount of the straight portion in valve seat side on lifting direction is 0,

When the valve element, which is located at most down position and the fluid, to be flowed to the positive direction, the straight portion in valve element side with it is described Coincidence amount of the straight portion in valve seat side on lifting direction is between the fixation threaded portion and movable threaded portion of the feed screw mechanism Backlash degree.

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

Upside in the straight portion in valve element side of the valve element, is provided with valve element side abutting part, and the valve element side abutting part has phase For the vertical face in lifting direction,

When the valve element declines compared to the most down position, the valve element side abutting part of the valve element and the valve master Body is abutted.

4. motor-driven valve according to claim 3, it is characterised in that

Valve element side abutting part is made up of the plane vertical relative to lifting direction,

The valve body side abutting part abutted in planar fashion with valve element side abutting part is provided with the valve body.

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

The seat portion and the valve port throttle orifice are formed at a part for the valve body.

6. according to motor-driven valve according to any one of claims 1 to 4, it is characterised in that

The seat portion and the valve port throttle orifice are formed at valve base part, the valve base part interpolation be fixed on be formed at it is described The slotting embedding hole of a part for valve body.

7. a kind of assemble method of motor-driven valve, the motor-driven valve possesses：

Valve shaft, the valve shaft is provided with valve element；

Pilot bushing, the pilot bushing has a cylindrical portion, and the valve shaft can relatively move and can be relative in the axial direction The cylindrical portion is inserted in the state of rotation；

Valve body, the valve body is provided with valve port throttle orifice and is formed with valve chamber, and the valve port throttle orifice has and the valve element It separate or close to remote seat portion, fluid is imported into the export valve chamber, and the pilot bushing is mounted on The valve body；

Valve shaft retainer, the valve shaft retainer has cylindrical portion and top, and links fixation, the cylindrical portion with the valve shaft Interpolation has the pilot bushing, and the top insertion is provided with by the inserting hole of the upper end insert of the valve shaft；

Force application part, the force application part is clipped between the valve shaft and the valve shaft retainer, with to the valve element to valve closing Direction exerts a force；

Motor, the motor has with the rotor of valve shaft retainer link and the stator for rotating the rotor, So that the valve shaft retainer rotates relative to the pilot bushing；

Feed screw mechanism, the feed screw mechanism is formed from the fixation threaded portion of the pilot bushing periphery and is formed at institute The movable threaded portion for stating valve shaft retainer inner circumferential is constituted, and the feed screw mechanism be used for according to the rotation driving of the rotor come The valve element of the valve shaft is set to be lifted relative to the seat portion of the valve body；And

Bottom stop mechanism, the bottom stop mechanism is by being arranged at the fixed stop body of bottom retainer and being arranged at the valve shaft The movable stop-motion body of retainer is constituted, and is declined with the rotation for limiting the valve shaft retainer, the bottom retainer has and institute The female threaded portion that the fixed threaded portion of pilot bushing is spirally connected is stated,

When the valve element is located at most down position by the bottom stop mechanism, the valve element and the seat portion it Between be formed with gap, also, fluid from the valve chamber to the positive direction of the valve port throttle orifice with from the valve port throttle orifice Flowed to the two directions of the opposite direction of the valve chamber, the assemble method of the motor-driven valve is characterised by,

The valve element of the motor-driven valve is provided with the straight portion in valve element side, the external diameter in the straight portion in valve element side is permanent on lifting direction It is fixed, the seat portion is provided with the straight portion in valve seat side, the internal diameter in the straight portion in valve seat side is constant on lifting direction,

Also, valve element side abutting part is provided with the upside of the straight portion in valve element side of the valve element, the valve element side abutting part tool There is the face vertical relative to lifting direction,

The assemble method is included：

, can be with the relative rotation by the bottom retainer in the state of the valve shaft does not link with the valve shaft retainer and fixed It is screwed to the pilot bushing and configures in assigned position, is located at the valve shaft retainer by the bottom stop mechanism Position is most moved down, and the valve element is declined compared to the most down position and is made valve element side abutting part and institute The process for stating valve body abutting；

The valve shaft and the valve shaft retainer are linked into fixed process；And

It is straight with least a portion in the straight portion in valve element side and the valve seat side when the valve element is located at the most down position The mode that at least a portion in portion is overlapped on lifting direction, the position that valve element side abutting part is abutted with the valve body As benchmark, the bottom retainer positioned at the assigned position is rotated relative to the pilot bushing to valve opening position and advise Determine the anglec of rotation and the bottom retainer and the pilot bushing are linked to the process for that can not rotate against.