CN118274131A - Electric drive throttle valve - Google Patents

Abstract

The invention provides an electrically-driven throttle valve, which comprises a valve body with a three-way structure, wherein the valve body comprises an outlet end of the valve body, an inlet end of the valve body for receiving fluid, and an adjusting end of the valve body, an execution unit arranged at the adjusting end of the valve body, and the execution unit comprises a driving mechanism and an actuating mechanism, wherein the driving mechanism comprises a push rod, a transmission piece sleeved outside the push rod, a driving ring sleeved outside the transmission piece, and a valve core arranged in the valve body and fixedly connected with the push rod, the actuating mechanism is configured to enable the driving ring to move in the circumferential direction, and the transmission piece is configured to enable the push rod to move in the axial direction under the action of the driving ring so as to enable the valve core to adjust the opening degree of the outlet end of the valve body. The invention can ensure that the push rod has stable working environment in the axial direction and can realize accurate adjustment of the position of the valve core.

Description

Electric drive throttle valve

Technical Field

The invention relates to the technical field of petroleum drilling, in particular to an electrically driven throttle valve.

Background

Pressure controlled drilling is an adaptive drilling process for precisely controlling the entire borehole annulus pressure profile, the purpose of which is to determine the limits of the downhole pressure environment and thereby control the borehole annulus fluid column pressure profile. A throttle valve is a critical component in controlling pressure in the operation of pressure controlled drilling.

There are various control methods of the throttle valve. Such as manual control, hydraulic control, pneumatic control, and electric control. Wherein manual control is difficult to achieve with precise adjustment and thus cannot be used to make real-time and accurate adjustments to the borehole annulus pressure profile. Although hydraulic control is generally performed by a hydraulic actuator, viscosity of hydraulic oil in the hydraulic actuator is extremely liable to be adversely affected by a change in temperature, and thus accurate adjustment is not possible. Pneumatic control is difficult to achieve because it is driven by compressed air in the pneumatic actuator. In addition, pneumatic actuators are extremely prone to frost in low temperature environments, and thus can have a significant impact on the regulation of wellbore annulus pressure profiles.

Currently, electric control is the best choice for a throttle valve. The electric actuator in electric control has the advantages of compact structure, high adjustment precision, long transmission signal distance, strong deviation resistance and the like, so that unbalanced force of a medium can be overcome more easily, and accurate control of relevant technological parameters is ensured.

CN111720609a discloses an electrically controlled orifice plate type throttle valve for fine pressure control well drilling, which comprises a multi-rotation electric actuator, a supporting frame, a connecting piece and an orifice plate type throttle valve. The multi-rotation electric actuator consists of a hand wheel, a clutch, a worm, a turbine, a coupling mechanism, a low inertia high torque motor, a drive bevel gear, an output shaft, a driven bevel gear, a feedback shaft, a valve position absolute encoder, an on-site display window, a manual/electric knob and the like. The device can realize the basic function of the throttle valve. However, the worm and gear structure in the device is extremely easy to cause tooth surface abrasion when frequently working underground, so that the main shaft is moved, and the position of the valve core cannot be accurately adjusted. In addition, no other device capable of keeping the valve core in a stable working position exists in the device.

Accordingly, it is desirable in the art to provide an electrically driven throttle that solves the above-described problems.

Disclosure of Invention

The invention aims to provide an electrically-driven throttle valve, which can ensure that a push rod has a stable working environment in the axial direction and can realize accurate adjustment of the position of a valve core. The driving mechanism, the actuating mechanism and the feedback braking mechanism are all arranged coaxially and sequentially along the axial direction, so that the electrically driven throttle valve has the advantages of compact integral structure, large transmission torque, high response speed and the like, and the push rod can move stably in the axial direction and can accurately adjust the position of the valve core. In addition, the invention also adopts an absolute encoder, so that the transmission position of the push rod can be accurately and permanently recorded, and the opening degree of the outlet end of the valve body can be accurately adjusted more easily.

According to the present invention there is provided an electrically driven throttle valve comprising a valve body configured to have a three-way configuration including a valve body outlet end, a valve body inlet end disposed radially along the valve body for receiving a fluid, and a valve body adjustment end axially opposite the valve body outlet end,

An execution unit arranged at the adjusting end of the valve body and comprising a driving mechanism and an actuating mechanism arranged at the upstream of the driving mechanism, wherein the driving mechanism comprises a push rod arranged at the center, a transmission piece sleeved outside the push rod, a driving ring sleeved outside the transmission piece and connected with the actuating mechanism, and

A valve core arranged in the valve body and fixedly connected with the downstream end of the push rod,

Wherein the actuating mechanism is configured to enable the driving ring to move in the circumferential direction, and the transmission piece is configured to enable the push rod to move in the axial direction under the action of the driving ring so as to enable the valve core to adjust the opening degree of the outlet end of the valve body.

In one embodiment, the actuation mechanism is a brushless motor, the drive mechanism further comprising a decelerator disposed between a rotor in the brushless motor and the drive ring, the decelerator being configured in the form of a hollow sleeve, thereby allowing the pushrod to move axially into the decelerator.

In one embodiment, the transmission member is a planetary roller screw, and the driving mechanism further comprises a plurality of rollers arranged outside the planetary roller screw, and a screw nut sleeved outside the rollers, and the screw nut is matched with the driving ring in a key groove mode.

In one embodiment, the drive mechanism further comprises a first bearing disposed radially outward of the drive ring, a first compression ring disposed radially inward of the drive ring for limiting an axial position of the lead screw nut, and a second compression ring disposed radially outward of the drive ring and downstream of the first bearing, wherein the second compression ring is in axial abutment with an inner wall of the first bearing.

In one embodiment, the electrically driven throttle valve further comprises a shell sleeved outside the driving mechanism, a compression conical surface for axially abutting against the compression cap is formed at the downstream end of the shell,

The drive mechanism further includes a valve cap including a first valve cap portion, a second valve cap portion extending radially outwardly from the first valve cap portion and fixedly connected to the housing, and a third valve cap portion extending axially upwardly from the second valve cap portion and axially abutting an outer wall of the first bearing, wherein the first valve cap portion is configured to extend into the valve body adjustment end to permit the pushrod to move axially partially within the valve cap into the valve body.

In one embodiment, the pushrod includes a first pushrod portion configured as a lead screw, a second pushrod portion disposed downstream of the first pushrod portion, and a pin disposed between the first pushrod portion and the second pushrod portion, wherein a first prism is formed at a junction of the second pushrod portion and the first valve cap portion for limiting rotation of the pushrod.

In one embodiment, a radially outwardly extending step is provided on the inner wall of the first valve cover portion,

The drive mechanism further includes a seal bushing disposed on the step for closing an annulus between the second pushrod portion and the first valve cap portion.

In one embodiment, the actuator unit further comprises a feedback brake mechanism arranged upstream of the actuator mechanism, comprising an encoder shaft connected to the rotor, an encoder sleeved outside the encoder shaft for registering the transmission position of the push rod, and a brake sleeved outside the encoder shaft and upstream of the encoder, wherein the brake is configured to maintain the encoder shaft in a fixed attitude by means of a brake disc, and a second prism is provided at the free end of the encoder shaft for connection with an external tool to allow manual adjustment of the electrically driven throttle valve.

In one embodiment, the electrically driven throttle valve further includes a protective sleeve disposed within the valve body and axially abutting the first valve cover portion, the valve core being configured to be initially disposed within the protective sleeve.

In one embodiment, the first prism of the pushrod is configured to divide the interior cavity of the drive mechanism into an upper space and a lower space,

The electrically driven throttle valve further includes an automatic lubrication mechanism including a first passage extending through the housing and the drive ring and communicating with the upper space, a grease nipple disposed outside the housing for blocking the first passage, and a second passage communicating a portion of the upper space with the lower space,

Wherein the push rod is configured to cause the lubricant within the inner cavity to circulate within the upper space and the lower space through the first passage and the second passage.

Compared with the prior art, the invention has the advantages that: the invention can ensure that the push rod has stable working environment in the axial direction and can realize accurate adjustment of the position of the valve core. The driving mechanism, the actuating mechanism and the feedback braking mechanism are all arranged coaxially and sequentially along the axial direction, so that the electrically driven throttle valve has the advantages of compact integral structure, large transmission torque, high response speed and the like, and the push rod can move stably in the axial direction and can accurately adjust the position of the valve core. In addition, the invention also adopts an absolute encoder, so that the transmission position of the push rod can be accurately and permanently recorded, and the opening degree of the outlet end of the valve body can be accurately adjusted more easily.

Drawings

The invention will be described in detail below with reference to the attached drawing figures, wherein:

fig. 1 schematically shows the structure of an electrically driven throttle valve according to the present invention;

fig. 2 is a schematic structural view of an actuator unit in the electrically driven throttle valve according to the present invention.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Detailed Description

In order to make the technical solution and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present invention and are not exhaustive of all embodiments. And embodiments of the invention and features of the embodiments may be combined with each other without conflict.

The directional term "upstream" or the like refers to a direction closer to the wellhead, i.e., the top direction in fig. 1. The directional term "downstream" or the like refers to a direction away from the wellhead, i.e., the bottom end direction in fig. 1.

Fig. 1 schematically shows the structure of an electrically driven throttle valve 100 according to the present invention.

As shown in fig. 1, the electrically driven throttle valve 100 according to the present invention mainly includes a valve body 1 constructed in a three-way structure. The valve body 1 comprises a valve body outlet end 11, a valve body inlet end 12 and a valve body regulating end 13, respectively. Wherein the valve body outlet end 11 is arranged axially opposite the valve body adjustment end 13. The valve body inlet end 12 is disposed to extend radially of the valve body 1 and is configured to receive and direct fluid flow toward the valve body outlet end 11.

According to the invention, as shown in fig. 1, the electrically driven throttle valve 100 further comprises an execution unit 2. The actuator unit 2 is arranged at the valve body adjustment end 13 and is capable of selectively blocking the valve body outlet end 11 by controlling the axial movement of a valve spool 4 (described below) within the valve body 1.

Fig. 2 is a schematic structural view of the actuator unit 2 in the electrically driven throttle valve 100 according to the present invention. According to the invention, as shown in fig. 2, the execution unit 2 comprises a drive mechanism 3, and an actuating mechanism 5 arranged upstream of the drive mechanism 3. Wherein the driving mechanism 3 is connected with the valve core 4. The actuating mechanism 5 is configured to be able to cause the valve spool 4 to move axially within the valve body 1 by controlling the drive mechanism 3 so that the valve spool 4 adjusts the opening of the valve body outlet port 11. The contents of which are described below. It will be readily appreciated that the valve element 4 may also extend into the outlet end 11 of the valve body for the purpose of sealing.

In one embodiment, as shown in fig. 2, the actuating mechanism 5 is preferably a brushless motor, and includes a stator 51 disposed radially outward, a rotor 52 disposed radially inward, and a plurality of permanent magnets (not shown) disposed within the rotor 52. Wherein the rotor 52 is connected to the drive mechanism 3. A plurality of coil windings 53 are provided in the stator 51, and the coil windings 53 can communicate with an external power source.

In accordance with one embodiment of the present invention, the coil winding 53 is configured to generate a rotating magnetic field upon energization. The permanent magnet is configured to be capable of driving the rotor 52 to rotate in the circumferential direction under the action of the above-described rotating magnetic field, thereby further driving the driving mechanism 3 to move. The contents of which are described below.

In one embodiment, as shown in FIG. 2, electrically driven throttle 100 further includes motor housing 8 that is sleeved outside of actuation mechanism 5. Preferably, one end of the coil winding 53 protrudes out of the motor casing 8 to communicate with an external power source, thereby achieving electric driving of the electrically driven throttle valve 100.

According to the invention, as shown in fig. 2, the drive mechanism 3 comprises a centrally arranged push rod 31, a transmission member which is sleeved outside the push rod 31, and a drive ring 33. Wherein the downstream end of the push rod 31 is fixedly connected with the valve core 4. The drive ring 33 is sleeved outside the transmission member and connected with a rotor 52 in the actuating mechanism 5, so that the drive ring 33 can rotate in the circumferential direction under the action of the rotor 52. Preferably, the drive ring 33 is rigidly connected to the rotor 52.

In one embodiment, the transmission is preferably a planetary roller screw 32. Therefore, the circumferential movement of the drive ring 33 can be more easily converted into the axial movement of the push rod 31 by the planetary roller screw 32, thereby driving the valve element 4 to move in the axial direction to adjust the opening degree of the valve body outlet end 11. The working process of the planetary roller screw 32 is well known to those skilled in the art and will not be described in detail.

Currently, the throttle valve in the prior art generally uses a worm gear as a main driving tool. However, after the worm gear works with high strength for a long time, the tooth surface of the worm gear is severely worn, so that the main shaft can move along multiple directions, and the position adjusting precision of the valve core 4 is seriously affected. Compared with the prior art, the invention converts the circumferential motion of the driving ring 33 into the axial motion of the push rod 31 through the planetary roller screw 32, thereby being capable of realizing the accurate regulation and control of the valve core 4 more easily. In addition, the transmission structure is simple, the transmission times are small, and therefore the rapid and effective regulation and control can be effectively achieved.

In one embodiment, as shown in fig. 2, the drive mechanism 3 further comprises a decelerator 34. The decelerator 34 is disposed between the rotor 52 and the driving ring 33. The speed reducer 34 is rigidly connected with the rotor 52 and the driving ring 33, so that the sensitivity of the action response of the electrically-driven throttle valve 100 can be remarkably improved, and the opening degree of the outlet end 11 of the valve body can be rapidly adjusted, so that the stability and reliability of the valve operation can be ensured.

Preferably, the speed reducer 34 includes, but is not limited to, a harmonic gear speed reducer or a planetary gear speed reducer. Which can be based on motor torque, rotational speed, and throttle specification matching, as is well known to those skilled in the art.

According to one embodiment of the present invention, as shown in fig. 2, the pushrod 31 includes a first pushrod portion 311 and a second pushrod portion 312 disposed downstream of the first pushrod portion 311. Wherein the first push rod portion 311 is configured in the form of a screw so as to be able to be fully contacted with a roller 322 (described below) as a part of the planetary roller screw 32, thereby greatly improving the conversion capability of the circumferential movement of the drive ring 33 into the axial movement of the push rod 31. The second push rod portion 312 is configured in a stepped cylindrical structure and is fixedly connected to the first push rod portion 311 by a pin 314, thereby ensuring that the push rod 31 always has a stable state during axial movement.

In one embodiment, the decelerator 34 is configured in the form of a hollow sleeve. Thus, the decelerator 34 can provide a sufficient moving space for the pushrod 31 during the axial movement of the pushrod 31. That is, the first push rod portion 311 can be moved to the inside of the decelerator 34 more easily, thereby effectively shortening the overall length of the electrically driven throttle valve 100, and thus, can satisfy different applications.

According to one embodiment of the present invention, both the rotor 52 and the drive ring 33 are constructed as hollow sleeve structures. In this way, the rotor 52, the driving ring 33 and the speed reducer 34 can provide enough movement space for the axial movement of the push rod 31, so that the overall length of the electrically-driven throttle valve 100 can be effectively reduced to adapt to different application scenarios.

In one embodiment, as shown in fig. 2, the driving mechanism 3 further includes a plurality of rollers 33 disposed outside the planetary roller screw 32 and a screw nut 321 sleeved outside the rollers 33. The planetary roller screw 32 is configured to form a key groove fit with the driving ring 33 through the screw nut 321, thereby ensuring the consistency of rotation of the driving ring 33 and the planetary roller screw 32 and the tightness of connection, and further effectively improving the accuracy, consistency and agility of adjustment of the valve core 4.

Compared with the prior art, the invention has the advantages that the layout relations among all the components are compact, and the main driving components are rigidly connected, so that the overall transmission torque and response speed can be effectively improved. Therefore, the electric drive throttle valve 100 can effectively improve the stability of the valve core 4 in the adjusting process, thereby ensuring the accuracy of adjusting the valve core 4.

In one embodiment, as shown in fig. 2, the drive mechanism 3 further comprises a first bearing 331. Wherein the first bearing 331 is disposed radially outside the drive ring 33. The first bearing 331 is configured to be able to locate the circumferential rotation of the drive ring 33 and also to withstand bidirectional axial forces, thereby ensuring the operating state of the drive ring 33. Preferably, the first bearing 331 is an angular contact ball bearing.

In one embodiment, as shown in fig. 2, the drive mechanism 3 further includes a first pressure ring 332 and a second pressure ring 333. Wherein, the first pressing ring 332 is disposed radially inside the driving ring 33 for restricting the axial position of the lead screw nut 321, thereby ensuring stability between the lead screw nut 321 and the driving ring 33. The second pressure ring 333 is disposed radially outward of the drive ring 33 and downstream of the first bearing 331. Thereby, the position restriction of the drive ring 33 can be more easily achieved by the cooperation of the first pressing ring 332 and the second pressing ring 333. Preferably, the first pressing ring 332 and the second pressing ring 333 are fixedly connected with the driving ring 33 through threads.

In a preferred embodiment, the second pressure ring 333 is in axial abutment with the inner wall of the first bearing 331, so that the axial position of the first bearing 331 can be effectively restricted.

In one embodiment, as shown in fig. 2, the electrically driven throttle 100 further includes a housing 6 that is sleeved outside the drive mechanism 3. A pressing tapered surface 61 for axial abutment with a press cap 21 (described later) is formed at the downstream end of the housing 6. Therefore, the actuator 2 can be firmly mounted on the outlet end 11 of the valve body under the action of the pressing cap 21 and the pressing conical surface 61, and the actuator 2 can be positioned. In addition, the downstream end of the motor housing 8 extends into the housing 6 to form a fixed connection. The housing 6 and the motor housing 8 can effectively protect the drive mechanism 3 and the actuator mechanism 5, respectively.

Compared with the prior art, the invention can fully protect and seal the electric drive throttle valve 100 through the shell 6, the motor shell 8 and the encoder shell 9 (described below), thereby reducing the influence of the severe environment of the well site on the electric drive throttle valve 100, prolonging the service life of the whole device and being more suitable for drilling operation.

In one embodiment, as shown in FIG. 2, the electrically driven throttle valve 100 further includes a pressure cap 21. The press cap 21 is sleeved outside the shell 6, so that the driving mechanism 3 and the valve body 1 can be tightly connected, and the tightness of the valve body adjusting end 13 is ensured. Furthermore, a positioning pin 22 is provided between the second valve cap portion 352 (described below) and the valve body adjustment end 13, so as to ensure that the actuator unit 2 and the valve body 4 are always in the correct relative installation position.

According to the present invention, as shown in fig. 2, the driving mechanism 3 includes a valve cover 35 sealingly connected to the downstream end of the housing 6. The valve cover 35 includes a first valve cover portion 351, a second valve cover portion 352 extending radially outwardly from the first valve cover portion 351, and a third valve cover portion 354 extending axially upwardly from the second valve cover portion 352. Wherein the interior of the first valve cap portion 352 has a shape that is adapted to the first prism 313 (described below). The outer peripheral surface of the second valve cap portion 352 forms a sealed connection with the inner peripheral surface of the housing 6, thereby ensuring sealing of the valve body adjustment end 13. The third valve cover portion 354 abuts the outer wall of the first bearing 331 in the axial direction, thereby restricting the axial position of the first bearing 331.

According to one embodiment of the invention, the first cap portion 351 is configured to extend into the valve body adjustment end 13, thereby allowing the second push rod portion 312 to move axially partially into the valve body 1 within the cap 35 to adjust the opening of the valve body adjustment end 13. The valve element 4 can also close the valve body outlet 11 if necessary.

According to one embodiment of the present invention, as shown in fig. 2, a first prism 313 is formed at the junction of the second pushrod portion 312 and the first valve cap portion 351 to cooperate with the second valve cap portion 352 to limit the rotation of the pushrod 31. In addition, since the pushrod 31 has a good rigid structure, the pushrod 31 can more easily meet the output requirement of a large thrust force, and the service life of the pushrod 31 is also prolonged to some extent. Preferably, the first prism 313 is a hexagonal prism so as to be able to adapt to the structure in the first valve cap portion 351 to ensure that the push rod 31 can only move axially in the valve body 1.

In one embodiment, as shown in FIG. 2, a radially outwardly extending step 353 is provided on the inner wall of the first valve cover portion 351. In this way, the sealing liner 36 can be placed in the annulus between the second pushrod portion 312 and the first valve cap portion 351. Accordingly, the sealability between the second push rod portion 312 and the first valve cover portion 351 can be ensured by the seal bush 36.

In one embodiment, as shown in FIG. 2, a stem seal 37 is also provided downstream of the seal bushing 36. Preferably, the stem seal 37 is a flood seal. Thus, the second pushrod portion 312 can pass through the center of the rod seal 37 and the fluid within the valve body 1 does not enter the annulus outside the pushrod 31 under the influence of the rod seal 37, thereby ensuring the safety of the use of the actuator unit 2.

In one embodiment, as shown in FIG. 2, a third compression ring 38 is also provided downstream of the stem seal 37 to axially compress the stem seal 37 and the seal bushing 36 to provide a good seal against the valve body adjustment end 13.

According to the invention, as shown in fig. 2, the execution unit 2 further comprises a feedback brake mechanism 7 arranged upstream of the actuation mechanism 5. The feedback brake mechanism 7 includes an encoder shaft 71, a brake 73 fitted over the encoder shaft 71, and a brake disk 731 connected to the brake 73. Preferably, the downstream end of the encoder shaft 71 is flexibly connected to the upstream end of the rotor 52 by a quincuncial coupling 75 so as to be able to follow the rotor 52 in a circumferential direction. Meanwhile, the connection mode can effectively reduce the machining precision requirement of parts and the assembly difficulty of the whole machine, so that the working efficiency of the electrically-driven throttle valve 100 is improved.

In one embodiment, brake 73 is configured to enable encoder shaft 71 to maintain a fixed attitude by brake disc 731. Preferably, the brake 73 is braked in a power-off mode.

According to one embodiment of the present invention, the yoke on brake 73 generates a magnetic field when energized, the armature is attracted away from the friction plate, no friction between the friction plate and brake disk 731, and encoder shaft 71 is free to rotate.

According to one embodiment of the present invention, the magnetic field generated by the yoke on brake 73 is removed when the power is off, the spring compresses the armature, and thus the friction plate, against brake disk 731, which generates a static friction force, and encoder shaft 71 stops rotating.

It is to be noted that the brake 73 is in the above-described power-off state when the power supply is abnormal, and the encoder shaft 71 stops rotating and is in a fixed posture. In this way, the valve element 4 can be always in a fixed position in the axial direction, so that the opening degree of the valve body outlet end 11 can be ensured. It is easy to understand that the drilling fluid pressure in this state does not fluctuate due to the valve position change, so that the safety of the drilling operation can be ensured.

According to the invention, the feedback brake mechanism 7 also comprises an encoder 72, which is sleeved outside the encoder shaft 71 and downstream of the brake 73, as shown in fig. 2. Preferably, the encoder 72 is an absolute encoder so that the transmission position of the rotor 52 can be accurately and permanently recorded, and thus the opening degree of the valve body outlet end 11 can be more easily and accurately adjusted. It will be readily appreciated that after a system power-off restart, the electrically driven throttle valve 100 is able to register the opening position, and therefore no further readjustment of the position of the spool 4 is required.

In one embodiment, a second prism 711 is provided at the free end of the encoder shaft 71 for connection with an external tool. Preferably, the second prisms 711 include, but are not limited to, tetragonal prisms and hexagonal prisms.

According to the invention, as shown in fig. 2, the electrically driven throttle 100 further comprises an encoder housing 9 that is sleeved outside the feedback brake mechanism 7. The downstream end of the encoder housing 9 extends into the motor housing 8 to form a fixed connection. The second prism 711 of the encoder shaft 71 protrudes from the inside of the encoder housing 9 so as to be connectable with an external tool. Therefore, the position of the valve core 4 can be manually adjusted in an active manner by an external tool, so that the electrically driven throttle 100 can be suitable for different emergency situations.

In one embodiment, an emergency situation is, for example, the entire electrically driven throttle 100 is powered down. A backup power supply (not shown) is required to energize the actuator mechanism 5, whereupon an external tool can be fixedly connected to the second prism 711, thereby enabling manual adjustment of the axial position of the valve element 4 by rotating the external tool to adjust the opening of the valve body outlet end 11.

In one embodiment, as shown in fig. 2, the encoder shaft 71 is located at the center of the encoder housing 9, and a second bearing 74 is provided radially outside the encoder shaft 71, thereby ensuring that the encoder shaft 71 can stably rotate in the encoder housing 9.

According to the present invention, as shown in fig. 2, the electrically driven throttle valve 100 further includes a top cover 91 and a top cap 92. Wherein the top cover 91 is sealingly connected to the upstream end of the encoder housing 9, and the top cap 92 is detachably mounted on the top cover 91, thereby effectively protecting the second prisms 711.

In one embodiment, as shown in FIG. 1, the electrically driven throttle valve 100 further includes a protective sheath 41. The protective sleeve 41 is disposed within the valve body 1 and axially abuts the first cap portion 351. The side wall of the protective cover 41 is fixedly connected with the inner wall of the valve body adjusting end 13, so that the valve core 4 in the initial state can be well protected in the protective cover 41. It will be readily appreciated that the protective sheath 41 serves two purposes. One is to reduce the vibrations of the valve element 4 during operation. And secondly, the top end of the valve core 4 is protected from fluid erosion.

In a preferred embodiment, the protective sheath 41 is made of erosion resistant material. For example, cemented carbide or quenched stainless steel. The protective sheath 41 may also be treated by erosion resistance. For example, the surface of the base alloy steel is plated with chromium or with stellite.

In one embodiment, as shown in FIG. 1, the electrically driven throttle 100 also includes a connecting rod 42. The spool 4 is configured to be threadably coupled to the second pushrod portion 312 by a connecting rod 42.

In one embodiment, the second pushrod portion 312 has internal threads in the downstream end and the end is round-milled flat so that a secure connection can be more easily made with the connecting rod 42.

Preferably, the valve core 4 has a symmetrical structure. In other words, the upstream end and the downstream end of the spool 4 are identical in structure. Therefore, when one end of the valve core 4 fails due to erosion, the valve core can directly turn the direction on the connecting rod 42 and continue to operate with the other end, so that the operating efficiency of the electrically driven throttle valve 100 is significantly improved.

In one embodiment according to the present invention, as shown in fig. 1, the electrically driven throttle valve 100 further includes a valve seat 14 and a corrosion resistant sleeve 15 that are adapted to the valve element 4. Wherein a valve seat 14 is provided in said valve body outlet end 11 for forming a sealing connection with the valve cartridge 4. A corrosion resistant sleeve 15 is provided downstream of the valve seat 14 for ensuring the safety of the valve body 1.

Preferably, the valve seat 14 is of a symmetrical structure, and when one end fails due to erosion, the valve seat 14 can be turned around and continue to operate with the other end, so that the operating efficiency of the electrically driven throttle valve 100 is significantly improved.

According to one embodiment of the invention, all the parts of the driving mechanism 3, the actuating mechanism 5 and the feedback braking mechanism 7 are all arranged coaxially and coaxially of the revolution body and are sequentially distributed along the axial direction. Therefore, the electrically driven throttle valve 100 has the advantages of compact overall structure, large transmission torque, high response speed and the like.

In one embodiment, the first prism 313 of the push rod 31 is configured to divide the inner cavity of the driving mechanism 3 into an upper space 101 and a lower space 102, and the upper space 101 and the lower space 102 are filled with lubricating oil for lubrication and cooling, which will be described below.

According to the present invention, as shown in fig. 1 and 2, the electrically driven throttle valve 100 also includes an automatic lubrication mechanism. The automatic lubrication mechanism includes a first channel 103 and a grease nipple 104. Wherein the first channel 103 in turn extends through the housing 6 and the drive ring 33 in communication with the upper space 101. A nipple 104 is provided outside the housing 6 and serves to close off the first channel 103. Further, the upper space 101 may be replenished with lubricating oil through the oil nozzle 104 to ensure that the driving mechanism 3 can be sufficiently lubricated and cooled.

In one embodiment, the self-lubricating mechanism further comprises a second channel 105 communicating the upper space 101 with the lower space 102. Accordingly, when the pushrod 31 moves downward, the lubricating oil in the lower space 102 flows into the upper space 101 through the second passage 105 and the first passage 103 by the first prism 313 of the pushrod 31. When the push rod 31 moves upstream, the lubricating oil in the upper space 101 flows into the lower space 102 through the first channel 103 and the second channel 105 under the action of the first prism 313 of the push rod 31, so as to ensure that the oil can penetrate through the whole driving mechanism 3, thereby achieving the purpose of fully lubricating and cooling, and further effectively prolonging the service life of the electrically-driven throttle valve 100.

It will be readily appreciated that, as can be seen from fig. 2, the upper space 101 refers generally to the chamber between the first pushrod portion 311 and the planetary roller screw 32, as well as the chamber within the first bearing 311. The lower space 102 generally refers to the annulus between the first valve cover portion 351 and the second pushrod portion 312.

As can be easily understood, as shown in fig. 2, the inner cavities of the first bearing 331, the planetary roller screw 32, the speed reducer 34 and other parts are penetrated by the oil passage holes of the valve cover 35 and the driving ring 33, so that a closed oil passage is realized in the housing 3 to sufficiently lubricate and cool the parts in the driving mechanism 3, and the working efficiency of the electrically driven throttle valve 100 can be effectively improved.

In another embodiment of the invention, the electrically driven throttle 100 can eliminate the speed reducer 34, thereby directly connecting the rotor 52 with the drive ring 33. In this way, the overall length of the electrically driven throttle valve 100 can be effectively reduced, so as to adapt to different application scenarios (for example, situations requiring low output force of the pushrod 31, high response speed for adjusting the valve element, and limited installation space).

In another embodiment of the present invention, the electrically driven throttle 100 is capable of integrating the actuating mechanism 5 with the driving mechanism 3. Specifically, the rotor 52 is designed to be hollow, and the first bearings 331 are provided at both ends of the screw nut 321, so that it can be adapted to different application scenarios (for example, a case where a small installation space is required)

The invention provides an electrically driven throttle valve which can ensure that a push rod 31 has a stable working environment in the axial direction and can realize accurate adjustment of the position of a valve core 4. All parts of the driving mechanism 3, the actuating mechanism 5 and the feedback braking mechanism 7 are arranged coaxially and sequentially along the axial direction, so that the electrically driven throttle valve 100 has the advantages of compact overall structure, large transmission torque, high response speed and the like, and the push rod 31 can move stably along the axial direction and can accurately adjust the position of the valve core 4. In addition, the invention also adopts an absolute encoder, so that the transmission position of the push rod 31 can be accurately and permanently recorded, and the opening degree of the outlet end 11 of the valve body can be accurately adjusted more easily.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. Modifications and variations may readily be made by those skilled in the art within the scope of the present disclosure, and such modifications and variations are intended to be included within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. An electrically driven throttle valve comprising:

A valve body (1) configured to have a three-way structure, comprising a valve body outlet end (11), a valve body inlet end (12) arranged to extend radially along the valve body (1) and for receiving a fluid, and a valve body adjustment end (13) axially opposite the valve body outlet end (11),

An actuator unit (2) arranged at the valve body adjusting end (13) and comprising a driving mechanism (3) and an actuating mechanism (5) arranged upstream of the driving mechanism (3), wherein the driving mechanism (3) comprises a centrally arranged push rod (31), a transmission piece sleeved outside the push rod (31), and a driving ring (33) sleeved outside the transmission piece and connected with the actuating mechanism (5), and

A valve core (4) which is arranged in the valve body (1) and fixedly connected with the downstream end of the push rod (31),

Wherein the actuating mechanism (5) is configured to enable the driving ring (33) to move circumferentially, and the transmission member is configured to enable the push rod (31) to move axially under the action of the driving ring (33) so as to enable the valve core (4) to adjust the opening degree of the outlet end (11) of the valve body.

2. Electrically driven throttle valve according to claim 1, characterized in that the actuating mechanism (5) is a brushless motor, the drive mechanism (3) further comprising a decelerator (34) arranged between a rotor (52) in the brushless motor and the drive ring (33), the decelerator (34) being configured in the form of a hollow sleeve allowing the pushrod (31) to move axially into the decelerator (34).

3. Electrically driven throttle as claimed in claim 2, characterized in that the transmission is a planetary roller screw (32), the drive mechanism (3) further comprising a number of rollers (322) arranged outside the planetary roller screw (32), and a screw nut (321) sleeved outside the rollers (322), the screw nut (321) forming a splined fit with the drive ring (33).

4. An electrically driven throttle valve according to claim 3, characterized in that the drive mechanism (3) further comprises a first bearing (331) arranged radially outside the drive ring (33), a first pressure ring (332) arranged radially inside the drive ring (33) for limiting the axial position of the lead screw nut (321), and a second pressure ring (333) arranged radially outside the drive ring (33) and downstream of the first bearing (331), wherein the second pressure ring (333) is in axial abutment with the inner wall of the first bearing (331).

5. The electrically driven throttle valve as claimed in claim 4, further comprising a housing (6) sleeved outside the driving mechanism (3), a pressing conical surface (61) formed at a downstream end of the housing (6) for axial abutment with a pressing cap (21),

The drive mechanism (3) further comprises a valve cover (35) comprising a first valve cover part (351), a second valve cover part (352) extending radially outwards from the first valve cover part (351) and fixedly connected with the housing (6), and a third valve cover part (354) extending axially upwards from the second valve cover part (352) and axially abutting against the outer wall of the first bearing (331), wherein the first valve cover part (351) is configured to be able to extend into the valve body adjusting end (13) so as to allow the push rod (31) to move axially partly into the valve body (1) in the valve cover (35).

6. The electrically driven throttle valve as claimed in claim 5, characterized in that the pushrod (31) comprises a first pushrod portion (311) configured as a threaded rod, a second pushrod portion (312) disposed downstream of the first pushrod portion (311), and a pin shaft (314) disposed between the first pushrod portion (311) and the second pushrod portion (312), wherein a first prism (313) for restricting rotation of the pushrod (31) is formed at a junction of the second pushrod portion (312) and the first valve cap portion (351).

7. An electrically driven throttle valve as claimed in claim 6, characterized in that a step (353) extending radially outwardly is provided on an inner wall of the first valve cover portion (351),

The drive mechanism (3) further comprises a sealing bushing (36) arranged on the step (353) for closing an annulus between the second pushrod portion (312) and the first valve cap portion (351).

8. Electrically driven throttle valve according to claim 7, characterized in that the actuator unit (2) further comprises a feedback brake mechanism (7) arranged upstream of the actuator mechanism (5), comprising an encoder shaft (71) connected to the rotor (52), an encoder (72) sleeved outside the encoder shaft (71) for registering the transmission position of the push rod (31), and a brake (73) sleeved outside the encoder shaft (71) and upstream of the encoder (72), wherein the brake (73) is configured to keep the encoder shaft (71) in a fixed position by means of a brake disc (731), a second prism (711) being provided at the free end of the encoder shaft (71) for connection with an external tool for allowing manual adjustment of the electrically driven throttle valve.

9. The electrically driven throttle valve according to claim 8, characterized in that the electrically driven throttle valve further comprises a protective sleeve (41) provided in the valve body (1) and axially abutting the first valve cover portion (351), the valve spool (4) being configured to be able to be in the protective sleeve (41) in an initial state.

10. Electrically driven throttle as claimed in claim 9, characterized in that the first prism (313) of the push rod (31) is configured to divide the interior space of the drive mechanism (3) into an upper space (101) and a lower space (102),

The electrically driven throttle valve further comprises an automatic lubrication mechanism comprising a first channel (103) extending through the housing (6) and the drive ring (33) and communicating with the upper space (101), a grease nipple (104) arranged outside the housing (6) and used for blocking the first channel (103), and a second channel (105) communicating part of the upper space (101) with the lower space (102), wherein the push rod (31) is configured to enable lubricating oil in the inner cavity to circulate in the upper space (101) and the lower space (102) through the first channel (103) and the second channel (105).