CN1576663A

CN1576663A - Electric valve

Info

Publication number: CN1576663A
Application number: CNA200410031056XA
Authority: CN
Inventors: 原田贵雄; 菅沼威
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2003-07-25
Filing date: 2004-04-12
Publication date: 2005-02-09
Also published as: JP4445726B2; JP2005042891A; KR20050013057A

Abstract

This motor operated valve comprises a valve main body 20 for adjusting a passing flow rate by a valve element 23 kept into contact with and separated from a valve seat 22 in a valve chamber 22 by a valve shaft 24, a can 40 incorporating a rotor 30 fixed to the valve main body 20 for bringing the valve element 23 into contact with the valve seat 22 or separated therefrom, and a stator 50 externally fitted to the can 40 for rotating and driving the rotor 30. The valve shaft 40 is slidably mounted on the push nut 33 and the flat washer 60. Plating layers 33a, 60a having the lubricating property are formed on the push nut 33 and the flat washer 60. The plating layer 33a is composed of a material including polytetrafluoroethylene.

Description

Mortor operated valve

Technical field

The present invention relates to a kind of mortor operated valve that uses in air conditioner, the refrigerating machine etc. that is assemblied in, particularly a kind ofly seek to improve the fatigue resistance of slipping parts of the valve shaft that constitutes moving element and the mortor operated valve of lubricity.

Background technique

At present, this mortor operated valve that uses in air conditioner, the refrigerating machine etc. that is assemblied in has the function of the fluid flow of adjusting refrigerant etc., has usually: the valve body that comprises valve chamber and valve seat; Be fixed on the cylinder-like shell that the end is arranged on the top of valve body by flange shape portion, at the inboard built-in rotor of shell, its central authorities of embedding have the stator of through hole outside the outside of shell.

Fig. 3 has represented the longitudinal section of the mortor operated valve 10 of patent documentation 1 record.Mortor operated valve 10 has: the valve body 20 of adjusting the flow that passes through of refrigerant by the valve body 23 that contacts with valve seat 22 clutches in the valve chamber 21; The shell 40 of built-in rotor 30, this rotor clutch contact is fixed on the valve body 23 on the valve body 20; Be embedded in outward on the shell 40, rotation drives the stator 50 of rotor 30.Rotor 30 and stator 50 have constituted stepper motor.In addition, at the bottom and the sidepiece of valve body 20, connect the refrigerant inflow and outflow pipe 20a, the 20b that are communicated with valve chamber 21.

In valve body 20, form valve chamber 21, below valve chamber 21, form valve seat 22, form guideway 26 up.With engaging of shell 40, be to be undertaken by the stepped part of the end butt welding of shell 40 being received the flange shape plate 41 of riveted fixing on valve body 20.

Shell 40 is formed with the cylindric of the end, is fixed on the flange shape plate of fixing on the top of valve body 20 41 the inner airtight conditions that keeps.Stator 50 is made of the yoke 51 that utilizes magnetic material to make, the stator coil up and down 53,53 that is wrapped on this yoke 51 by coil carrier 52, the embedding hole 50a of embedding outside forming on shell 40.Stretch out a plurality of conductor terminals 54 that are connected with

stator coil

53,53 from stator 50, connector 56 is connected with this conductor terminal 54, connects a plurality of leads 55 on this connector 56.

The valve body 23 that is made of needle valve is formed on the lower end of valve shaft 24.Valve body 23 is made of: extend fixing and guideway 26 form retaining thread portion 25 in periphery to rotor 30 directions from valve body 20 lower member with the driving mechanism that valve seat 22 clutches contact; Valve shaft supporter 32 with mobile screw section 31 that the retaining thread portion 25 with this guideway 26 screws togather.Said fixing screw section 25 is made of the external screw thread of the periphery of guideway 26, and mobile screw section 31 is formed by the female thread in the interior week of valve shaft supporter 32.

Valve shaft supporter 32 is the cylindrical shapes of lower opening that are positioned at the outside of guideway 26, form mobile screw section 31 at internal surface, the top diameter reducing part 24b that stepped part 24a by valve shaft 24 forms is entrenched in the center of valve shaft supporter 32, connects by thrust nut 33.The valve shaft 24 that valve body 23 lower ends form, the center that can insert valve shaft supporter 32 up or down is below the compression helical spring of installing by compression in valve shaft supporter 32 34 is pushed to.And the underpart of above-mentioned compression helical spring 34 is supported in the shoulder of valve shaft 24, upper end portion 34a by plain cushion tinsel 60 be supported in valve shaft supporter 32 below.

In addition, valve shaft supporter 32 is connected by supporting ring 36 with rotor 30, and the last lug boss of valve shaft supporter 32 is entrenched in interior all holes portion of supporting ring 36, will be joined together the periphery riveted fixing of above-mentioned lug boss and rotor 30, supporting ring 36 and valve shaft supporter 32.

The following stop-motion body 27 that constitutes a stop mechanism is fixed on the guideway 26, gives prominence to that above following stop-motion body 27 tabular following locking plate 27a being set.In addition, stop-motion body 37 on fixing another stop mechanism of formation on the valve shaft supporter 32, tabular last locking plate 37a downwards can engage with the outstanding following locking plate 27a that is provided with.

In addition, following stop-motion body 27 is fixed on the spiral chute part 26a of the periphery that is formed on guideway 26, and last stop-motion body 37 is fixed on the spiral chute part 32b of the periphery that is formed on valve shaft supporter 32.In addition, on the side of guideway 26, the purpose for the space in valve chamber 21 and the shell 40 is all pressed is provided with balancing orifice 32a in the bottom of retaining thread portion 25, by this balancing orifice 32a, makes refrigerant circulate easily.

But, in described mortor operated valve, because described thrust nut 33 or plain cushion tinsel 60 slip with the valve shaft 24 that moves up and down, so, comprise in use under the situation of refrigerant of lubricating oil family difficulty, the worry of wearing and tearing is arranged, proposition should improve the problem of fatigue resistance.

On the other hand, put down in writing in the patent documentation 2 below, in mortor operated valve, caused by wearing and tearing reducing easily on the parts of fatigue resistance, formed the nickel metal cladding that comprises teflon.

But the nickel metal cladding of record in patent documentation 2 is arranged on the screw section that is meshing with each other of valve shaft supporter and guideway, for the fatigue resistance problem of thrust nut 33 or plain cushion tinsel 60 parts, does not solve.

Patent documentation 1 spy opens the 2003-172467 communique

Patent documentation 2 spies open flat 8-219317 communique

Summary of the invention

Therefore, the present invention makes invention in view of the above problems, and its purpose is, a kind of mortor operated valve is provided, and it improves the fatigue resistance of thrust nut or plain cushion tinsel part.

To achieve these goals, mortor operated valve of the present invention comprises: valve body, the flow that is passed through by the valve body adjustment that contacts with valve seat clutch in the valve chamber by valve shaft; Shell, the built-in rotor that valve body is contacted with the valve seat clutch that is fixed on; Stator, be embedded in rotation driving rotor on the shell outward, above-mentioned valve shaft is configured in thrust nut or the plain cushion tinsel slidably, and simultaneously, at least one and above-mentioned valve shaft slips the metal cladding that formation has lubricity on the face in thrust nut or the plain cushion tinsel.In addition, the invention is characterized in that on technique scheme, metal cladding is to be made of the material that comprises teflon in the nickel.

Then, mortor operated valve of the present invention comprises: valve body, the flow that is passed through by the valve body adjustment that contacts with valve seat clutch in the valve chamber by valve shaft; Shell, the built-in rotor that valve body is contacted with the valve seat clutch that is fixed on; Stator, be embedded in rotation driving rotor on the shell outward, it is characterized in that, above-mentioned valve shaft is configured in thrust nut or the plain cushion tinsel slidably, simultaneously, form the metal cladding that is made of the material that comprises teflon in the nickel on the above-mentioned thrust nut, above-mentioned plain cushion tinsel forms the coating that is made of fluororesin.

Mortor operated valve of the present invention according to above-mentioned formation, a side of thrust nut and plain cushion tinsel, perhaps on two sides, forms metal cladding, thereby can improve fatigue resistance.In addition, particularly, when the switching (valve shaft moves up and down) of valve body, can reduce the slip resistance of valve shaft and thrust nut and plain cushion tinsel, can slide swimmingly reliably.Particularly, not wishing in the refrigerant loop has in the lubricated environment of refrigerating machine wet goods in the refrigerant loop, also can prevent the aging of slide members such as thrust nut, plain cushion tinsel, valve shaft, improves fatigue resistance, prevents the inharmonious of mortor operated valve operation.

In addition, mortor operated valve of the present invention, comprise the metal cladding that the material of teflon constitutes on above-mentioned thrust nut, forming by nickel, on above-mentioned plain cushion tinsel, form the coating that constitutes by fluororesin, can improve the lubricity of thrust nut, improve the fatigue resistance of plain cushion tinsel simultaneously, improved the fatigue resistance of mortor operated valve.

Description of drawings

Fig. 1 is the longitudinal section of a mode of execution of mortor operated valve of the present invention.

Fig. 2 is the enlarged view of the X part of Fig. 1.

Fig. 3 is the longitudinal section of the mortor operated valve of prior art.

Symbol description: 10 mortor operated valves (conventional example); 10 ' mortor operated valve (the present invention); 20 valve bodies; 20a, 20b inflow and outflow pipe; 21 valve chambers; 22 valve seats; 23 valve bodies; 24 valve shafts; 24a stepped part 24b goes up diameter reducing part; 25 retaining thread portions; 26 guideways; 26a spiral slot part; 27 times stop-motion bodies; Locking plate under the 27a; 30 rotors 31 move the screw section; 32 valve shaft supporters; The 32a balancing orifice; 32b spiral slot part; 33 thrust nuts; The 33a metal cladding; 34 compression helical springs; The 34a end; 36 supporting rings; Stop-motion body on 37; The last locking plate of 37a; 40 shells; 41 flange shape plates; 50 stators; The 50a embedding hole; 51 yokes; 52 coil carriers; 53 stator coils; 54 conductor terminals; 55 leads; 56 connectors; 60 plain cushion tinsels; The 60a metal cladding.

Embodiment

Fig. 1 is the longitudinal section of a mode of execution of mortor operated valve 10 ' of the present invention, and Fig. 2 is the enlarged view of the X part of Fig. 1, illustrates based on these figure.Below, in the explanation that embodiments of the present invention are carried out,, with the identical component parts of mortor operated valve 10 in the known example shown in Figure 3, give identical symbol in 2 for Fig. 1, omit its explanation.

As the feature of present embodiment, nickel plating on the surface of above-mentioned thrust nut 33 (Ni) perhaps, utilizes nickel (Ni) plating that comprises polytetrafluoroethylene (PTFE) to come application surface as metal cladding 33a.In addition, for plain cushion tinsel 60, also surperficial the same with thrust nut 33 forms the metal cladding 60a that is made of identical materials in its surface.And these processing (metal cladding 33a, the formation of 60a) can be carried out on the whole surface of thrust nut 33 and plain cushion tinsel 60, also can realize purpose of the present invention at least waiting slipping on the face of other parts to carry out with valve shaft 24.

As above-mentioned, thrust nut 33 and the plain cushion tinsel 60 that slips with valve shaft 24 carried out above-mentioned such surface treatment, rotor 30 rotations, the screw thread conveyer of the retaining thread portion 25 by guideway 26 and the mobile screw section 31 of valve shaft supporter 32, rotor 30, valve shaft supporter 32 and valve shaft 24 are along endwisely slipping, but by as present embodiment, slide connecting part being carried out above-mentioned surface treatment, slide swimmingly with low friction factor, just formed the slide connecting part that fatigue resistance improves.

Above-mentioned electro-plating method is identical with common electroless plating nickel method.The metal cladding hardness height of above-mentioned NI+PTFE, excellent in sliding property, in addition, wear resistance is also high.Therefore, by forming above-mentioned

metal cladding

33a, 60a, in the mortor operated valve of the low refrigerant of control washability height or lubricity, valve shaft 24 also can often keep normal function, the performance of performance regulation.And metal cladding also can be formed on the relative valve shaft 24 except forming on thrust nut 33 and plain cushion tinsel 60.In addition, also can form metal cladding on both at thrust nut 33 and plain cushion tinsel 60 and valve shaft 24.

As mentioned above, the valve shaft 24 when reducing switching (moving up and down of valve shaft 24) and the slip resistance of thrust nut 33 and plain cushion tinsel 60 at valve body 23, as

metal cladding

33a, 60a, utilize and comprise teflon in the nickel, metal cladding has lubricity, even do not add oiling agent, also can guarantee the side in thrust nut 33 and the plain cushion tinsel 60, perhaps both sides' is lubricated, can improve fatigue resistance.

In addition, in the refrigerant loop, do not wish to have in the lubricated environment of refrigerating machine wet goods, for example, under the situation of using the carbonic-acide gas refrigerant, also can prevent the aging of slide members such as thrust nut 33, plain cushion tinsel 60, valve shaft 24, improve fatigue resistance, prevent the inharmonious of mortor operated valve operation.

And, in the above-described embodiment, forming metal cladding 33a on both at thrust nut 33 and

plain cushion tinsel

60,60a also can any one go up formation therein.In addition, as other example, on above-mentioned thrust nut 33, form the metal cladding 33a of the material formation that comprises teflon in the nickel, on above-mentioned plain cushion tinsel 60, form the coating that constitutes by fluororesin, can improve the lubricity of thrust nut 33, improve the fatigue resistance of plain cushion tinsel 60 simultaneously, improved the fatigue resistance of mortor operated valve.

Claims

1. mortor operated valve comprises: valve body, the flow that is passed through by the valve body adjustment that contacts with valve seat clutch in the valve chamber by valve shaft; Shell, the built-in rotor that valve body is contacted with the valve seat clutch that is fixed on; Stator, be embedded in rotation driving rotor on the shell outward, it is characterized in that above-mentioned valve shaft is configured in thrust nut or the plain cushion tinsel slidably, simultaneously, in thrust nut or the plain cushion tinsel at least one and above-mentioned valve shaft slip the metal cladding that formation has lubricity on the face.

2. mortor operated valve according to claim 1 is characterized in that, described metal cladding is to be made of the material that comprises teflon in the nickel.

3. mortor operated valve comprises: valve body, the flow that is passed through by the valve body adjustment that contacts with valve seat clutch in the valve chamber by valve shaft; Shell, the built-in rotor that valve body is contacted with the valve seat clutch that is fixed on; Stator, be embedded in rotation driving rotor on the shell outward, it is characterized in that, above-mentioned valve shaft is configured in thrust nut or the plain cushion tinsel slidably, simultaneously, form the metal cladding that is made of the material that comprises teflon in the nickel on the above-mentioned thrust nut, above-mentioned plain cushion tinsel forms the coating that is made of fluororesin.