CN208845833U - Valve rod driving structure and automatically controlled throttle valve - Google Patents

Abstract

The utility model discloses a kind of valve rod driving structures, including Electric Actuator, transmission nut, thrust bearing and connecting key；Transmission nut is connected by internal screw thread with the thread segment of valve rod upper section；The lateral surface of transmission nut has a support bulge loop in the medium position of short transverse, and support is mounted on the upper intersegmental part of valve deck with bulge loop upper and lower end face by thrust bearing；The upper end of transmission nut is connected by connecting key with the output shaft of Electric Actuator；It is characterized in that: further including lubrication system, lubrication system includes shoe cream room, oil filler point and grease nipple；The medial surface for the transmission nut that support is surrounded with bulge loop has been recessed shoe cream room；The oil filler point for being provided with and being connected to shoe cream room is extended radially through between the side of the valve deck of the lateral surface and radially adjoining of support bulge loop；Oil filler point outer end position in the radial direction is fixedly installed with grease nipple.The invention also discloses a kind of automatically controlled throttle valves using above-mentioned valve rod driving structure.

Description

Valve rod driving structure and automatically controlled throttle valve

Technical field

The utility model belongs to the valve field for land oil recovery (gas) tree, and in particular to a kind of valve rod driving structure and Automatically controlled throttle valve.

Background technique

Land oil recovery (gas) tree is to connect the production pipe from underground for being mounted at the well head of flowing well or machine-pumped oil well Road and flowline simultaneously are used to extract natural gas or petroleum, meanwhile, land oils recovery (gas) tree and oil well top and external environment every The important barrier opened absolutely.Land oil recovery (gas) tree include it is many can be used to adjust or prevent produced crude oil steam, natural gas and A variety of valves that liquid is gushed out out of well, throttle valve are one of a variety of valves, throttle valve by change throttling section or Chock length is to control fluid flow.

Currently, the prior art generallys use Electric Actuator (existing product, this will not be repeated here) to match with throttle valve To constitute automatically controlled throttle valve, wherein the basic function of Electric Actuator is open and close valve, and spool can also be allowed to be in standard-sized sheet and complete Any state between pass, general Electric Actuator have manually and automatically two ways, and wherein automated manner divides again and controls on the spot With long-range control.Electric Actuator can according to the needs of users and field management, security needs configure, and can also be locked with padlock Be scheduled on the spot/stop/long-range a certain state.On the spot when automatic position, by push-botton operation on the spot, remotely when control, by long-range Control button or procedure auto-control operation；When manual position, just it can be operated by one people of actuator handwheel.From the foregoing, it will be observed that automatically controlled section Stream valve has the advantages that use more convenient, it can be achieved that long-range quickly manipulation, can help the efficiency for improving valve manipulation.

But existing throttle valve is (for example, notification number is CN206708534U, a kind of disclosed " wedge-type of circular arc concave surface The technical solution of manual throttle valve ") there are still following shortcomings:

Mainly the bearing of rolling support transmission nut is lubricated in existing valve rod driving structure, is ignored to biography Lubrication between dynamic nut and the valve rod upper section of threaded connection, causes throttle valve after long-term use, and transmission nut and screw thread connect Lubricity between the valve rod connect reduces, and thus will increase the driving difficulty and driving force of valve rod.

Based on this, applicant considers that designing one kind has more lasting effective lubricant effect, preferably ensures throttle valve The valve rod driving structure of long term reliability.

Summary of the invention

In view of the above shortcomings of the prior art, the technical problem to be solved by the utility model is to how to provide a kind of tool There is more lasting effective lubricant effect, preferably ensures the valve rod driving structure of throttle valve long term reliability.It goes forward side by side One step provides a kind of automatically controlled throttle valve using the valve rod driving structure.

In order to solve the above-mentioned technical problem, the utility model uses the following technical solution:

Valve rod driving structure, including Electric Actuator, transmission nut, thrust bearing and connecting key；

The Electric Actuator is integrally attached to outside the upper end of valve deck；

The transmission nut generally band internal thread sleeve-like configuration, the transmission nut pass through internal screw thread and valve rod The thread segment of upper section is connected；In the medium position of short transverse, radially evagination is formed with one to the lateral surface of the transmission nut A support bulge loop, the support are rotatably fixed each by thrust bearing with bulge loop upper and lower end face and are mounted on the upper of valve deck Intersegmental part；

The upper end of the transmission nut is connected by the connecting key with the output shaft of the Electric Actuator；Its feature It is:

It further include lubrication system, the lubrication system includes shoe cream room, oil filler point and grease nipple；

The medial surface for the transmission nut that the support is surrounded with bulge loop has been recessed the shoe cream room；

It extends radially through and is provided between the side of the valve deck of the lateral surface and radially adjoining of support bulge loop The oil filler point being connected to the shoe cream room；The oil filler point outer end position in the radial direction is fixedly installed with the grease nipple.

In the technical scheme, by the way that above-mentioned shoe cream room is arranged on the inside of transmission nut, (also referred to as by oiling grease nipple " forced filling oil cup ") and oil filler point come give shoe cream room injection lubricating oil, in this way, through oil filler point inject lubricating oil during, profit Lubricating oil can not only gap between the support bulge loop through transmission nut and adjacent valve cover medial surface enter thrust bearing In the space of place；The valve rod upper section that lubricating oil comes pcrmanent lubrication transmission nut and threaded connection can have also been saved in shoe cream room, More lasting effective lubricant effect is obtained, preferably ensures throttle valve long term reliability.

Automatically controlled throttle valve, it is characterised in that: including valve rod driving structure described above.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the automatically controlled throttle valve of the utility model.

Fig. 2 is enlarged drawing at A in Fig. 1.

Fig. 3 is enlarged drawing at B in Fig. 1.

Fig. 4 is enlarged drawing at C in Fig. 1.

In the figure, it is marked as

100 valve bodies: 1001 main parts, 1002 by-passing parts, 1003 valve deck installation ends, 1004 shop bolts；

101 valve decks: 1011 stop screws, 1012 overlap joint bulge loops, 1013 locking nuts, 1014 pressure compensation openings；

102 valve rods: 1021 mounting cylinders, 1022 guide grooves；

103 spools；

104 wearing bush；

105 lock sleeves；

201 Electric Actuator；

202 transmission nuts: bulge loop is used in 2021 supports；

203 thrust bearings；

204 connecting keys；

205 shoe cream rooms；

206 oil filler points；

207 grease nipples；

208 terminal pads: 2081 compress with protrusion；

209 pressure caps；

210 bar sealing rings.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawing.

When specific implementation: as shown in Figures 1 to 4:

Automatically controlled throttle valve, including valve body 100, valve deck 101 and valve rod 102；

The valve body 100 has main part 1001 and by-passing part 1002, and the shape of the main part 1001 is vertical Column, the inside of the main part 1001 be equipped with along axially through channel, the lower end in the channel constitutes the input of valve body 100 End, upper end are valve deck installation end 1003；The shape of the by-passing part 1002 is to be fixed on the outside of the main part 1001 The column construction in face, the inside of the by-passing part 1002 are the hollow structure penetrated through with the channel, and the by-passing part End on 1002 far from the main part 1001 constitutes the output end of valve body 100；

The valve deck 101 is fixed on the upper end of the main part 1001 of the valve body 100, and the shape of the valve deck 101 is The lower section of column construction, the valve deck 101 is plugged on inside the valve deck installation end 1003 of valve body 100；The inside of the valve deck 101 The installation cavity for the valve rod 102 installation is provided with along axial line perforation；

The valve rod 102 is slidably inserted into the installation cavity, and the lower end of the valve rod 102 is fixed with spool 103, the lower intersegmental part of the main part 1001 of the valve body 100 has and can cooperate the valve seat realized and blocked with the spool 103；

The lower end surface middle part fovea superior of the valve rod 102 simultaneously makes the lower section of the valve rod 102 be formed with a mounting cylinder 1021, the upper end of the spool 103 is plugged and fixed in the mounting cylinder 1021；The lower end surface of the mounting cylinder 1021 constitutes limit End face, the overall diameter of the limit end face is greater than the largest outer diameter of the spool 103, and the limit end face can be with the valve seat Upper surface abut realize valve rod 102 lower dead center limit.

Compared with the existing technology compared with above-mentioned automatically controlled throttle valve has the advantage, that

1, structure is simple.Valve rod 102 only can be realized in the limit of lower dead center by increasing the overall diameter of mounting cylinder 1021.

2, it can persistently ensure that valve rod 102 obtains reliable limit in bottom of stroke: because of the lower end surface of mounting cylinder 1021 It is abutted with the upper surface of valve seat, in this way, not only having bigger contact area, can reduce unit stress, sustain more Big 102 driving force of valve rod, it is ensured that position limiting structure can be more lasting is reliable；Additionally it is possible to pass through mounting cylinder 1021 Just parallel with 102 driving force direction of valve rod structure is best to obtain for stress direction between lower end surface and valve seat upper surface Blocking limit effect so that valve rod 102 obtains reliable limit in bottom of stroke.

When implementation, is preferably extended radially through on spool 103 and be provided with perforation, the side setting of the mounting cylinder 1021 and institute The perforation perforative pilot hole of face is stated, by being inserted into perforation and pilot hole between the spool 103 and mounting cylinder 1021 Fixed pin, which is realized, to be fixed.So, spool 103 is not only aloowed reliably to be fixed in mounting cylinder 1021, additionally it is possible to The posture of spool 103 in the circumferential is effectively ensured, the reliable flow of realization adjusts and opening and closing function.

Wherein, the lower section inner wall in the channel of the main part 1001 of the valve body 100 lower than by-passing part 1002 is under The single-stage ring-shaped step and a locking two stage steps that interior diameter becomes larger successively are recessed to upper；

The valve seat includes wearing bush 104 and lock sleeve 105, and the lower section of the wearing bush 104 is inserted into the single-stage ring In shape step, the upper section lateral surface of the wearing bush 104 is connected with the medial surface male-female engagement of the lock sleeve 105, and institute The lateral surface for stating lock sleeve 105 is screwed on by screw thread is fixed in the locking two stage steps and realizes the lock of wearing bush 104 It fastens.

After structure using above-mentioned wearing bush 104, the antifraying force of valve body 100 can be increased by wearing bush 104, held Long ensures 100 reliability of structure of valve body.

The structure of wearing bush 104 is locked using above-mentioned lock sleeve 105, has structure simple, the advantages of being easily locked.

When implementation, along the circumferential direction uniform intervals are provided with multiple counterbores for turning for the upper surface of lock sleeve 105.This Sample, which is facilitated using tool, turns lock sleeve 105, improves assembly efficiency.

Wherein, the wearing bush 104 is be sequentially arranged two of short transverse of the main part 1001 along valve body 100, A underlying wearing bush 104 is in the single-stage ring-shaped step in two wearing bush 104, and one be located above is anti- Grinding set 104 is in the locking two stage steps and hardness is greater than the hardness of a underlying wearing bush 104.

Because the medial surface for a wearing bush 104 being located above need to be in contact to realize with the peripheral side of spool 103 Sealing can be promoted effectively close between spool 103 after a wearing bush 104 being located above has more preferably wearability The reliability of envelope, so that the turn-off function of valve is relatively reliable.

Wherein, radially evagination forms limited position column to the lower section medial surface of the valve deck 101, is on the valve rod 102 The lateral surface of length section in the lower section of the valve deck 101 is radially recessed the guiding being slidably inserted into for the limited post Slot 1022, and the guide groove 1022 is the strip axially extending along the valve rod 102.

After the structure matched using above-mentioned limited post and guide groove 1022, it can more preferably realize valve rod 102 in circumferencial direction Limit, and can preferably ensure that valve rod 102 can accurately be moved along axial direction, promote the precision of throttle valve regulating flow.

Wherein, the lower section lateral surface of the valve deck 101 is provided with the mounting hole extended radially through, the inner wall of the mounting hole One section close to 101 lateral surface of valve deck has screw thread, and is screwed in the mounting hole by screw thread and is fixed with a stop screw 1011, the stop screw 1011 inner end in the radial direction stretches out the mounting hole and constitutes the limited post.

The structure of limited post is constituted using above-mentioned stop screw 1011, has structure more simple, it is easier in valve deck The advantages of being assembled on 101.

Wherein, it is open end that the guide groove 1022, which is upper end,.

So, i.e., so that the upper end of guide groove 1022 passes through for limited post, so that 101 entirety of valve deck can be more It is easily assemblied on valve body 100, simplifies assembly manipulation and improves assembly efficiency.

Wherein, shape between the lower section lateral surface of the valve deck 101 and 1003 medial surface of valve deck installation end of the valve body 100 At there is the gap stayed for medium；The lower section of the valve deck 101 is provided with the pressure compensation opening 1014 extended radially through, described The gap is connected to by pressure compensation opening 1014 with the guide groove 1022.

Firstly, the structure of above-mentioned gap and pressure compensation opening 1014 is simple, it is easier to which machine-shaping is conducive to improve processing effect Rate.It and after adopting the above structure, can be when throttle valve be opened, so that the medium be connected in throttle valve is through above-mentioned gap and pressure Balance hole 1014 enters in guide groove 1022, balances pressure of the valve rod 102 on pressure compensation opening 1014 in down space, Neng Goubao Card valve rod 102 can reliably be driven.

Wherein, the adjacent contacting surface of the valve deck 101 above the pressure compensation opening 1014 and the valve body 100 it Between be equipped with O-ring seal；The adjacent contact of the valve rod 102 and the valve deck 101 below the pressure compensation opening 1014 O-ring seal is equipped between face.

O-ring seal has structure simple at above-mentioned two, can be realized between valve deck 101 and valve body 100 and valve rod While obtaining excellent sealing between 102 and valve deck 101；It will not interfere the patency of pressure compensation opening 1014, structure design It is more succinct reasonable.

Wherein, the medium position evagination of the 101 lateral surface short transverse of valve deck is formed with and the valve deck installation end The connected overlap joint bulge loop 1012 of 1003 end faces overlap joint；

It further include locking nut 1013,1013 entirety of locking nut is socketed in the valve body 100 and takes with described Connect 1012 junction of bulge loop, and on the inside of the lower section of the locking nut 1013 by screw thread and 100 lateral surface of valve body it Between be fixedly linked, the upper section medial surface of locking nut 1013 and it is described overlap joint bulge loop 1012 upper surface between contact phase Connect and realizes the locking to the valve deck 101.

Because land oil recovery (gas) tree is usually in outdoor installation, exposing to the weather is existing to fix valve deck using bolt is carried out 101 structure is easy to corrode after a certain time, causes bolt looseness or stuck phenomenon occur, is unfavorable for maintaining equipment The reliability used.

The technical program is locked the structure of valve deck 101 with nut 1013 using above-mentioned locking, can pass through locking nut 1013 come the good threaded connection place of hood guard, thus the reliability that more lasting maintenance equipment uses.

Wherein, between the lower end surface of the overlap joint bulge loop 1012 of the end face of the valve deck installation end 1003 and the valve deck 101 The position of face has been recessed a positioning chamber jointly, and a shop bolt 1004 is fitted in the positioning chamber to realize Location and installation between the valve deck 101 and the valve body 100.

After adopting the above structure, it can be achieved that the rapid alignment between valve deck 101 and valve body 100 positions and assembly, help to mention The accuracy and efficiency of height assembly.

When implementation, the lower end surface of the overlap joint bulge loop 1012 of the end face of the valve deck installation end 1003 and the valve deck 101 it Between corresponding position be recessed an annular chamber jointly, and be caught in the annular chamber be provided with an O-ring seal come it is real Existing radial seal.

In this way, it can be achieved that being sealed between overlap joint bulge loop 1012 and the end face of valve deck installation end 1003 of valve deck 101, further The leakproofness for promoting throttle valve, promotes the safety used.

When implementation, automatically controlled throttle valve further includes valve rod driving structure (as " the valve rod driving structure " of the utility model), The valve rod driving structure includes Electric Actuator 201, transmission nut 202, thrust bearing 203 and connecting key 204；

The Electric Actuator 201 is integrally attached to outside the upper end of valve deck 101；

The transmission nut 202 generally band internal thread sleeve-like configuration, the transmission nut 202 pass through internal screw thread It is connected with the thread segment of 102 upper section of valve rod；The lateral surface of the transmission nut 202 short transverse medium position radially Evagination is formed with a support bulge loop 2021, and 2021 upper and lower end face of support bulge loop can each by thrust bearing 203 Rotatably it is fixedly mounted on the upper intersegmental part of valve deck 101；

The upper end of the transmission nut 202 is connected by the connecting key 204 with the output shaft of the Electric Actuator 201 It connects；

It further include lubrication system, the lubrication system includes shoe cream room 205, oil filler point 206 and grease nipple 207；

The medial surface for the transmission nut 202 that the support is surrounded with bulge loop 2021 has been recessed the shoe cream room 205；

It is extended radially through between the side of the valve deck 101 of the support lateral surface of bulge loop 2021 and radially adjoining It is provided with the oil filler point 206 being connected to the shoe cream room 205；The oil filler point 206 outer end position in the radial direction is fixedly mounted There is the grease nipple 207.

Mainly the bearing of rolling support transmission nut 202 is lubricated in existing valve rod driving structure, is ignored To the lubrication between transmission nut 202 and 102 upper section of valve rod being threadedly coupled, cause throttle valve after long-term use, is driven spiral shell Lubricity between mother 202 and the valve rod 102 being threadedly coupled reduces, and thus will increase the driving difficulty and drive of valve rod 102 Power.

In the technical scheme, by the way that above-mentioned shoe cream room 205 is arranged on the inside of transmission nut 202, pass through oiling grease nipple 207(be also referred to as " forced filling oil cup ") and oil filler point 206 come give shoe cream room 205 injection lubricating oil, in this way, through 206 note of oil filler point During entering lubricating oil, lubricating oil can not only 101 inside of support bulge loop 2021 and adjacent valve cover through transmission nut 202 Gap between face enters in 203 place space of thrust bearing；Lubricating oil can have also been saved in shoe cream room 205 to come persistently Lubricating transmission nut 202 preferably ensures with 102 upper section of valve rod being threadedly coupled, the more lasting effective lubricant effect of acquisition Throttle valve long term reliability.

When implementation, the shoe cream room 205 is annular chamber.It may make shoe cream room 205 that there is bigger oil storage space in this way While, it can also obtain better rotary lubrication effect.

When implementation, the preferably described oil filler point 206 is the multiple of circumferentially spaced setting.So, can be improved through Oil filler point 206 injects the injection rate of lubricating oil into shoe cream room 205 and fills rate.

When implementation, the upper section of the shoe cream room 205 is up-small and down-big cone cylinder type inner cavity, and lower section is cylindrical cavity.

So, can by the upper section side of shoe cream room 205 come transmission nut 202 rotate when so that therein Lubricating oil can gather in the case where being centrifuged masterpiece to the axial line of valve rod 102, promote lubricating oil on the thread segment of valve rod 102 Degree of adhesion persistently and is obviously improved lubricant effect herein.

When implementation, the upper end of the valve deck 101 is solid by the shell of a terminal pad 208 and the Electric Actuator 201 Fixed to be connected, the terminal pad 208 generally disc-shaped structure and middle part is equipped with the relief hole passed through for transmission nut 202 is described Compression protrusion 2081, compression protrusion are convexly equipped under the lower end surface of the terminal pad 208 around relief hole lower end 2081 for compressing the thrust bearing 203 that the support is put off with 2021 upper surface of bulge loop；

101 upper end surface of valve deck described in the upper surface face of the terminal pad 208 is circumferentially spaced be provided with it is multiple Mounting hole, the upper surface of the valve deck 101 be provided with the one-to-one threaded hole of each mounting hole, each mounting hole with it is corresponding Threaded hole in be screwed with connection bolt and be fixedly linked；

The edge of the terminal pad 208 is arranged at intervals with multiple vertical perforative connecting holes, the Electric Actuator The lower end surface of 201 shell be equipped with the one-to-one threaded hole of each connecting hole, be screwed in each connecting hole and threaded hole Bolt is connected to be fixedly linked.

The structure of Electric Actuator 201 is fixedly mounted by above-mentioned terminal pad 208, has and has the advantages of simple structure and easy realization The advantages of, it can be effectively reduced the improvement cost to existing manual throttle valve, there is more preferably economic benefit.

When implementation, indent is provided with two-stage installation step to the upper section of the valve deck 101 from top to bottom, and wherein two-stage is installed It is filled out in underlying one, step equipped with bar sealing ring 210；

It further include a pressure cap 209, the pressure cap 209 is whole in the tubular covered outside 102 upper section of valve rod, the pressure cap 209 lower section lateral surface is connected by screw thread with two-stage installation with the underlying step side of step, and the pressure The lower end of cap 209 is abutted with the bar with the upper surface of sealing ring 210 to be connected；209 upper end of pressure cap evagination radially outside It is formed with limit bulge loop, which is overlapped on the step surface for the step that two-stage installation is located above with step with bulge loop；

The upper surface of the limit bulge loop constitutes the support put off for the 2021 lower section thrust bearing 203 of support bulge loop Face.

After adopting the above scheme, can make to obtain between valve rod 102 and valve deck 101 by bar sealing ring 210 more preferable Sealing, effectively avoid the loss of the lubricating oil in shoe cream room 205.

When implementation, the spool 103 is in a circumferential direction lozenges close to a half side-view of the by-passing part 1002.

In this way, above-mentioned spool 103 has better wearability, the big gas well of silt content, poppet can be preferably adapted to 103 service life of core；At the same time, lozenges also constitutes guide face, and the medium passed through herein is not easy to form whirlpool, it is ensured that The conducting efficiency of throttle valve.

The above is only the utility model preferred embodiments, it is noted that not taking off for those skilled in the art Under the premise of from the technical program, the technical solution for the several modifications and improvements made should equally be contemplated as falling within the claims Claimed range.

Claims (10)

1. valve rod driving structure, including Electric Actuator, transmission nut, thrust bearing and connecting key；

The Electric Actuator is integrally attached to outside the upper end of valve deck；

The transmission nut generally band internal thread sleeve-like configuration, the transmission nut pass through internal screw thread and valve rod upper section Thread segment be connected；In the medium position of short transverse, radially evagination is formed with a branch to the lateral surface of the transmission nut Support bulge loop, the support are rotatably fixed in the upper section for being mounted on valve deck with bulge loop upper and lower end face each by thrust bearing Portion；

The upper end of the transmission nut is connected by the connecting key with the output shaft of the Electric Actuator；Its feature exists In:

It further include lubrication system, the lubrication system includes shoe cream room, oil filler point and grease nipple；

The medial surface for the transmission nut that the support is surrounded with bulge loop has been recessed the shoe cream room；

It extends radially through and is provided with and institute between the side of the valve deck of the lateral surface and radially adjoining of support bulge loop State the oil filler point of shoe cream room connection；The oil filler point outer end position in the radial direction is fixedly installed with the grease nipple.

2. valve rod driving structure according to claim 1, it is characterised in that: the shoe cream room is annular chamber.

3. valve rod driving structure according to claim 2, it is characterised in that: the upper section of the shoe cream room is up-small and down-big Cone cylinder type inner cavity, lower section are cylindrical cavity.

4. valve rod driving structure according to claim 1, it is characterised in that: the upper end of the valve deck passes through a terminal pad It is fixedly linked with the shell of the Electric Actuator, the terminal pad generally disc-shaped structure and middle part are equipped with for transmission nut The relief hole passed through is convexly equipped with compression protrusion, the pressure under the lower end surface of the terminal pad around the relief hole lower end The tight thrust bearing put off for compressing the support with bulge loop upper surface with protrusion；

Valve deck upper end surface described in the upper surface face of the terminal pad is circumferentially spaced to be provided with multiple mounting holes, described The upper surface of valve deck be provided with the one-to-one threaded hole of each mounting hole, be screwed in each mounting hole and corresponding threaded hole There is connection bolt to be fixedly linked；

The edge of the terminal pad is arranged at intervals with multiple vertical perforative connecting holes, the shell of the Electric Actuator Lower end surface be equipped with the one-to-one threaded hole of each connecting hole, connection bolt is screwed in each connecting hole and threaded hole to consolidate It is fixed to be connected.

5. valve rod driving structure according to claim 1, it is characterised in that: the upper section of the valve deck is recessed in from top to bottom It is equipped with two-stage installation step, wherein two-stage installation is filled out in underlying one, step equipped with bar sealing ring；

It further include a pressure cap, the pressure cap is integrally in the tubular covered outside valve rod upper section, the lower section lateral surface of the pressure cap It is connected by screw thread with two-stage installation with the underlying step side of step, and the lower end of the pressure cap and the bar It is abutted and is connected with the upper surface of sealing ring；Evagination forms limited position bulge loop radially outside for the pressure cap upper end, which uses Bulge loop is overlapped on the step surface for the step that two-stage installation is located above with step；

The upper surface of limit bulge loop constitutes the supporting surface put off for support bulge loop lower section thrust bearing.

6. automatically controlled throttle valve, it is characterised in that: including valve rod driving structure described in any one of claims 1 to 5.

7. automatically controlled throttle valve according to claim 6, it is characterised in that: including valve body, valve deck and valve rod；

The valve body has main part and by-passing part, and the shape of the main part is column shape, the main part Inside be equipped with along axially through channel, the lower end in the channel constitutes the input terminal of valve body, and upper end is valve deck installation end；The side The shape of logical part is the column construction for being fixed on the lateral surface of the main part, the inside of the by-passing part be with it is described The hollow structure of channel perforation, and the end on the by-passing part far from the main part constitutes the output end of valve body；

The valve deck is fixed on the upper end of the main part of the valve body, and the shape of the valve deck is column construction, the valve deck Lower section be plugged on inside the valve deck installation end of valve body；The inside of the valve deck is provided with along axial line perforation pacifies for the valve rod The installation cavity of dress；

The valve rod is slidably inserted into the installation cavity, and the lower end of the valve rod is fixed with spool, the valve body Intersegmental part, which has, under main part to cooperate the valve seat realized and blocked with the spool.

8. automatically controlled throttle valve according to claim 7, it is characterised in that: the spool is in a circumferential direction close to the side One half side-view of logical part is lozenges.

9. automatically controlled throttle valve according to claim 7, it is characterised in that: the end face of the valve deck installation end and the valve deck Overlap joint bulge loop lower end surface between corresponding position be recessed an annular chamber jointly, and setting is caught in the annular chamber There is an O-ring seal to realize radial seal.

10. automatically controlled throttle valve according to claim 7, it is characterised in that: the end face of the valve deck installation end and the valve The position of face has been recessed a positioning chamber, and inserting in the positioning chamber jointly between the lower end surface of the overlap joint bulge loop of lid There is a shop bolt to realize the location and installation between the valve deck and the valve body.