CN110848446A

CN110848446A - Solderless brushless linear motor driven poppet valve

Info

Publication number: CN110848446A
Application number: CN201911374542.4A
Authority: CN
Inventors: 华美蓉
Original assignee: Wuxi Longsheng Technology Co Ltd
Current assignee: Wuxi Longsheng Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-02-28

Abstract

The invention discloses a solderless lifting valve driven by a brushless linear motor, which comprises a valve body, wherein the interior of the valve body is in a hollow cavity shape, and the bottom of the valve body is provided with an air inlet and an air outlet; the top end of the valve body is provided with a brushless linear motor, and the output shaft end of the brushless linear motor is connected with a central rod and a valve core riveted at the bottom end of the central rod through a transitional connection structure; the transition connection structure comprises a driving block fixed at the end of an output shaft of the brushless linear motor and a coupler assembled with the driving block and connected with the central rod in a riveting mode. The invention adopts the brushless linear motor as the power source of the actuator, thereby simplifying the design structure. The central rod and the valve core are riveted and fixed, and the coupler and the central rod are riveted and fixed, so that the risk of falling of a welding seam generated by welding is avoided; the output shaft of the brushless linear motor is connected with the central rod by the coupler and the driving block, and the brushless linear motor cannot be damaged in the assembling process.

Description

Solderless brushless linear motor driven poppet valve

Technical Field

The invention relates to the technical field of automobile parts.

Background

Most internal combustion engines have poppet valves, sometimes referred to as cone valves, poppet valves or poppet valves, as intake and exhaust valves, for controlling the flow of air into the combustion chambers of the engine and the flow of exhaust burned gases. Typically, poppet valves are operated by cams on a rotating camshaft. In large diesel engines, the residual pressure in the combustion chamber can reach 70 bar when the exhaust valve is opened. This requires a considerable force to be applied to the exhaust valve.

As emissions regulations are upgraded, control systems become increasingly complex, placing higher demands on the response speed, accuracy and size of the actuators. The actuator power source of the existing poppet valve mostly adopts a direct current brush motor, and the direct current brush motor is small in size, simple in structure and easy to control, and is the first choice of various actuator power sources. However, dc brushed motors have two disadvantages: firstly, the electric brush is abraded, and after the direct current brush motor is used for a period of time, the carbon brush is seriously abraded, so that the service life of a product is limited; secondly, size, ordinary motor all is rotary motion, all needs a set of structure, converts rotary motion into linear motion, needs to adopt the shifter, and this must bring the complexity of structure.

The central rod of the existing poppet valve is connected with the valve core or other parts in a welding mode, and after the poppet valve is used for a long time, the phenomenon of falling is easy to occur under the continuous impact of high-temperature gas, the interior of the poppet valve needs to be periodically overhauled, and the fallen parts are replaced.

In addition, when the motor output shaft and the central rod of the poppet valve are not coaxial after installation, the motor output shaft, the central rod or other components are easily damaged, and the interior of the poppet valve is easily damaged prematurely. For this reason, the central rod of the poppet valve requires a high degree of precision in its installation, which undoubtedly increases the labor intensity of the operator.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a lift valve driven by a non-welded brushless linear motor, which solves the problems that the service life of a product is limited and the structure is complicated because the existing lift valve adopts a direct current brush motor, the problem that a central rod and a valve core are easy to fall off, and the problem that the motor output shaft, the central rod or other parts are easy to damage when the motor output shaft and the central rod of the lift valve are not coaxial after being installed, so that the service life of the lift valve is prolonged, the internal structure of the lift valve is simplified, the central rod of the lift valve does not need to be installed with high accuracy, and the central rod of the lift valve is not damaged too early.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows.

A lift valve driven by a brushless linear motor without welding comprises a valve body with a hollow cavity inside, wherein the bottom of the valve body is provided with an air inlet and an air outlet; the top end of the valve body is provided with a brushless linear motor, the output shaft end of the brushless linear motor is connected with a central rod penetrating through the hollow cavity of the valve body and a valve core which is riveted at the bottom end of the central rod and is used for controlling the on-off between the air inlet and the air outlet under the driving of the brushless linear motor through a transitional connection structure; the transitional connection structure comprises a driving block fixed at the end of the output shaft of the brushless linear motor and a coupler which is assembled with the driving block and connected with the central rod in a riveting mode for avoiding the problem of premature damage of parts when the output shaft of the brushless linear motor is not coaxial with the central rod.

Further optimize technical scheme, well core rod sets up to the step shaft form, well core rod from last to setting gradually down to first step shaft, second step shaft, third step shaft and fourth step shaft, first step shaft and second step shaft juncture are provided with and are used for riveting the first pressure of support of riveting of being convenient for when being connected with the shaft coupling, and third step shaft and fourth step shaft juncture are provided with and are used for riveting the second pressure of support of riveting of being convenient for when being connected with the case.

According to the technical scheme, the outer wall of the driving block is provided with an annular bulge, and the coupler is provided with a connecting clamping groove matched with the annular bulge.

According to the technical scheme, the valve core is a flat cover plate, the outer diameter of the valve core is larger than the inner diameter of the air inlet, and the outer diameter of the valve core is smaller than the inner diameter of the air outlet.

Further optimize technical scheme, still be provided with downwards on the valve body that is located brushless linear electric motor under and be used for prescribing a limit to the position of drive block and shaft coupling in order to guarantee that brushless linear electric motor's output shaft can stretch out the spacing arch of certain length.

Further optimize technical scheme, set up the shoulder hole that is linked together with the air inlet in the valve body, the shoulder hole includes from the top down sets gradually first shoulder hole, second shoulder hole and third shoulder hole in the valve body, and the air inlet is linked together with the gas outlet.

According to the technical scheme, a return structure which can ensure that the central rod and the valve core can be restored to the original positions after the brushless linear motor fails to control is arranged in the first step hole; the return structure comprises a return spring which is sleeved on the periphery of the central rod, one end of the return spring is fixed with the bottom end of the coupler, and the other end of the return spring is fixed with the inner wall of the first stepped hole.

According to the technical scheme, the sealing guide structures which are used for playing a sealing role and guiding the center rod are arranged in the second step hole and the third step hole.

Further optimize technical scheme, sealed guide structure is including inlaying the sealing washer that is used for preventing that high-temperature gas from scurrying in the second step hole and being used for avoiding brushless linear electric motor to damage because of the high temperature and inlaying the uide bushing that is used for playing the guide effect to well core rod under the sealing washer of inlaying in the second step hole, well core rod passes the sealing washer and with the sealing washer slip sealing join in marriage, well core rod passes the uide bushing.

Further optimize technical scheme, the uide bushing is the echelonment, and the lower part setting of uide bushing is downthehole at the third ladder, and the bottom mounting of uide bushing is provided with and is used for cleaing away the scraper blade of attaching to soot particulate matter on well core rod in order to ensure that the poppet valve can not block dead when well core rod reciprocates, and the bottom of scraper blade is inwards buckled and has certain clearance with well core rod between.

Due to the adoption of the technical scheme, the technical progress of the invention is as follows.

The invention adopts the brushless linear motor which does not need any additional mechanism and directly outputs linear motion as the actuator power source, cancels the switching mechanism, simplifies the design structure, greatly reduces the cost, greatly simplifies the structural design difficulty and increases the reliability of the product. According to the invention, the center rod and the valve core are riveted and fixed, and the coupler and the center rod are riveted and fixed, so that the risk of welding seam falling caused by welding is avoided; the output shaft of the brushless linear motor is connected with the central rod by the coupler and the driving block, so that the assembly is simple, the brushless linear motor cannot be damaged in the assembly process, the problem of premature damage of the motor and parts caused by the fact that the brushless linear motor and the central rod are not coaxial is avoided, and the cost advantage is obvious; the mechanical limit of the coupling is realized through the arranged limit bulge, the initial working position of the brushless linear motor is reached, and the consistency is good.

The coupling has the function of a spring seat, and the return spring is arranged between the coupling and the valve body, so that the valve core can return to the initial position under the condition of abnormal power failure of the brushless linear motor.

The limiting bulge is used for limiting the positions of the driving block and the coupler, and the output shaft of the brushless linear motor can extend out for a certain length. Because brushless dc motors have characteristics: the moment of the initial position is very small, and the working moment can be achieved only by extending a certain distance. The brushless linear motor is extended by a certain length when being installed, and the brushless linear motor is enabled to be in the initial position through the arranged limiting protrusions, the top end face of the driving block and the top end face of the coupler are in contact with the limiting protrusions, the output shaft of the brushless linear motor is enabled to be extended by a certain length at the initial position, mechanical limitation is carried out on the initial position of the brushless linear motor, the initial working position of the brushless linear motor is accurately positioned, and the consistency of a poppet valve product is guaranteed.

The scraper is fixedly arranged on the guide sleeve, and due to the arrangement of the scraper, the scraping operation of the central rod can be realized in the use process of the lifting valve, particulate matters such as carbon smoke and the like attached to the central rod can be removed in time, so that the lifting valve is not blocked, and the service life of the lifting valve can be prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the brushless linear motor of the present invention when mounted with a driving block;

FIG. 3 is a schematic view of the structure of the present invention when the center rod and the valve core are installed;

FIG. 4 is a schematic structural view of the present invention with the stem, core, and coupling mounted to the valve body;

FIG. 5 is a schematic structural view of the present invention when the center pole is riveted with the coupling;

fig. 6 is a schematic structural diagram of the brushless linear motor of the present invention when the coupling drives the center rod to rotate.

Wherein: 1. brushless linear electric motor, 2, drive block, 21, cyclic annular arch, 3, shaft coupling, 31, connecting groove, 4, sealing washer, 5, uide bushing, 6, scraper blade, 7, case, 8, return spring, 9, valve body, 91, air inlet, 92, gas outlet, 93, shoulder hole, 10, well core rod, 101, first pressure rivet step, 102, second pressure rivet step, 11, spacing arch.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments.

A lift valve driven by a brushless linear motor without welding is shown in a combined mode in figures 1 to 6 and comprises a valve body 9, the brushless linear motor 1, a central rod 10, a valve core 7 and a transition connection structure.

The valve body 9 is hollow and has an air inlet 91 and an air outlet 92 at the bottom of the valve body 9.

Brushless linear electric motor 1 sets up on the top of valve body 9, and brushless linear electric motor 1's output shaft end is provided with well core rod 10 through the transition connection structural connection, and well cavity that well core rod 10 passed valve body 9. And the valve body 9 and the brushless linear motor 1 are both provided with positioning pin holes, and motor positioning pins are inserted into the positioning pin holes in the valve body 9 and the brushless linear motor 1 to realize the locking and positioning of the brushless linear motor 1.

The brushless linear motor 1 is an electromechanical integrated product, not only cancels a brush structure, but also directly outputs linear motion, is very suitable for the application occasion of a poppet valve, and has the characteristics of low cost, long service life, high reliability and the like. The brushless linear motor 1 in the invention adopts a KYAC 2000 type linear motor, and can also adopt other types of linear motors.

Well core rod 10 sets up to the step shaft form, well core rod 10 from last to setting gradually down to first step shaft, second step shaft, third step shaft and fourth step shaft, first step shaft and second step shaft juncture are provided with first pressure and rivet step 101, and first pressure is riveted step 101 and is used for pressing with shaft coupling 3 and is riveted the support of being convenient for when being connected. And a second press-riveting step 102 is arranged at the junction of the third stepped shaft and the fourth stepped shaft, and the second press-riveting step 102 is used for press-riveting the valve element 7 and is convenient for press-riveting support.

The valve core 7 is riveted at the bottom end of the central rod 10 and used for controlling the on-off between the air inlet 91 and the air outlet 92 under the driving of the brushless linear motor 1.

The valve core 7 is a flat cover plate, the outer diameter of the valve core 7 is larger than the inner diameter of the air inlet 91, and the outer diameter of the valve core 7 is smaller than the inner diameter of the air outlet 92.

The transition connection structure comprises a driving block 2 and a coupling 3. The driving block 2 is fixed with the output shaft end of the brushless linear motor 1. The shaft coupling 3 is assembled with the driving block 2 and is connected with the central rod 10 in a riveting mode, and the problem that parts are damaged prematurely when the output shaft of the brushless linear motor 1 is not coaxial with the central rod 10 is solved.

The outer wall of the driving block 2 is provided with an annular bulge 21, and the coupling 3 is provided with a connecting clamping groove 31 matched with the annular bulge 21.

And a limiting bulge 11 is further downwards arranged on the valve body 9 under the brushless linear motor 1, and the limiting bulge 11 is used for limiting the positions of the driving block 2 and the coupler 3 so as to ensure that the output shaft of the brushless linear motor 1 can extend out by a certain length. Because brushless dc motors have characteristics: the moment of the initial position is very small, and the working moment can be achieved only by extending a certain distance. When the brushless linear motor is installed, the brushless linear motor stretches out by a certain length, and the limiting protrusions 11 are arranged, so that the brushless linear motor is in the initial position, the top end faces of the driving block 2 and the shaft coupler 3 are in contact with the limiting protrusions 11, and the output shaft of the brushless linear motor can stretch out by a certain length in the initial position.

A stepped hole 93 communicated with the air inlet 91 is formed in the valve body 9, the stepped hole 93 comprises a first stepped hole, a second stepped hole and a third stepped hole which are sequentially formed in the valve body 9 from top to bottom, and the air inlet 91 is communicated with the air outlet 92.

A return structure is arranged in the first step hole and used for ensuring that the central rod 10 and the valve core 7 can be restored to the original position after the brushless linear motor 1 fails to control.

The return structure comprises a return spring 8, the return spring 8 is sleeved on the periphery of the central rod 10, one end of the return spring 8 is fixed with the bottom end of the coupler 3, and the other end of the return spring is fixed with the inner wall of the first stepped hole.

The return spring 8 is arranged to ensure that the spool 7 returns to the initial position when the electrical control fails.

Sealed guide structure is provided with in second step hole and the third step hole, and sealed guide structure is used for playing sealed effect, and leads to center rod 10.

The sealing guide structure comprises a sealing ring 4 and a guide sleeve 5. The sealing ring 4 is embedded in the second stepped hole and used for preventing high-temperature gas from flowing upwards so as to prevent the brushless linear motor 1 from being damaged due to overhigh temperature. The guide sleeve 5 is embedded in the second stepped hole and located right below the sealing ring 4 and used for guiding the central rod 10, and the guide sleeve 5 is used for ensuring that the central rod 10 can move in the vertical direction all the time. The central rod 10 passes through the sealing ring 4 and is in sliding sealing assembly with the sealing ring 4, and the central rod 10 passes through the guide sleeve 5.

The uide bushing 5 is the echelonment, and the lower part setting of uide bushing 5 is downthehole at the third echelonment, and the bottom mounting of uide bushing 5 is provided with scraper blade 6, and scraper blade 6 is used for cleaing away when well core rod 10 reciprocates and adheres to soot particulate matter on well core rod 10 to ensure that the poppet valve can not block and die, the bottom of scraper blade 6 inwards buckle and with have certain clearance between well core rod 10.

In addition, the invention is also provided with a position sensor for detecting the motion position of the output shaft of the brushless linear motor 1 and a control unit for receiving a position sensor signal and controlling the brushless linear motor 1, wherein the control unit adopts a 51 single chip microcomputer. The controlled end of the brushless linear motor 1 is connected to the output end of the control unit, and the output end of the position sensor is connected to the input end of the control unit.

The actual assembly process of the present invention is as follows.

First, the drive block 2 is mounted on the output shaft of the brushless linear motor 1, as shown in fig. 2. After the valve element 7 is fitted into the center rod 10, the center rod is press-riveted with the valve element as shown in fig. 3.

Next, the scraper 6, the guide sleeve 5, and the seal ring 4 are sequentially installed in the valve body 9. The center rod assembly is installed in the valve body 9, the return spring 8 is placed in the valve body, and the return spring 8 is fixed. And (3) installing the coupler 3, and performing riveting connection on the coupler 3 and the central rod 10. The center rod 10 is provided with a first press riveting step 101 for facilitating press riveting and supporting, as shown in fig. 5.

And finally, mounting the brushless linear motor 1 assembly, manually pulling out an output shaft of the brushless linear motor 1, mounting the driving block 2 into the coupler 3, inserting a motor positioning pin into the valve body 9 and a positioning pin hole in the brushless linear motor 1, locking a screw, and positioning the brushless linear motor 1 on the valve body 9.

When the valve is actually used, the output shaft of the brushless linear motor 1 drives the driving block 2, the coupler 3 and the central rod 10 to move up and down, so that the valve core 7 is driven to move up and down, and the on-off between the air inlet 91 and the air outlet 92 of the valve body 9 is controlled. The position sensor transmits a detection signal to the control unit while the output shaft of the brushless linear motor 1 moves up and down. During the up-and-down movement of the central rod 10, the scraping plate 6 can remove the particulate matters such as soot attached to the output shaft of the brushless linear motor 1, so that the valve body is prevented from being stuck.

The invention adopts the brushless linear motor 1 which directly outputs linear motion without any additional mechanism as the actuator power source, is very suitable for the application occasion of the lift valve, and has the characteristics of low cost, long service life, high reliability and the like. The advantages of the invention include: 1. the output shaft of the motor directly outputs linear motion, a conversion mechanism is eliminated, and the win-win cost and reliability are achieved; 2. the central rod 10 and the valve core 7 are riveted and fixed, so that the risk of falling off of a welding seam generated by welding is avoided; 3. the output shaft of the brushless linear motor 1 is connected with the central rod 10 by the coupler 3 and the driving block 2, so that the assembly is simple, the brushless linear motor 1 cannot be damaged in the assembly process, and the cost advantage is obvious; 4. the initial working position of the brushless linear motor 1 is reached through mechanical limiting, and the consistency is good.

Claims

1. A lift valve driven by a brushless linear motor without welding comprises a valve body (9) with a hollow cavity inside, wherein the bottom of the valve body (9) is provided with an air inlet (91) and an air outlet (92); the method is characterized in that: the top end of the valve body (9) is provided with a brushless linear motor (1), the output shaft end of the brushless linear motor (1) is connected with a central rod (10) penetrating through the hollow cavity of the valve body (9) and a valve core (7) which is riveted at the bottom end of the central rod (10) and is used for controlling the on-off of the air inlet (91) and the air outlet (92) under the driving of the brushless linear motor (1); the transitional connection structure comprises a driving block (2) fixed to the end of the output shaft of the brushless linear motor (1) and a coupler (3) which is assembled with the driving block (2) and connected with the central rod (10) in a riveting mode to avoid the problem that the output shaft of the brushless linear motor (1) and the central rod (10) are not coaxial and cause premature damage of parts.

2. A weldless brushless linear motor driven poppet valve as defined in claim 1, wherein: well core rod (10) set up to the step shaft form, well core rod (10) from last to setting gradually down to first step shaft, second step shaft, third step shaft and fourth step shaft, first step shaft and second step shaft juncture are provided with and are used for pressing with shaft coupling (3) and rivet the first pressure of support of riveting step (101) of being convenient for when being connected, and third step shaft and fourth step shaft juncture are provided with and are used for pressing with case (7) and rivet the second of support of being convenient for when being connected and rivet step (102) of riveting step of pressing.

3. A weldless brushless linear motor driven poppet valve as defined in claim 1, wherein: the outer wall of the driving block (2) is provided with an annular bulge (21), and the coupler (3) is provided with a connecting clamping groove (31) matched with the annular bulge (21).

4. A weldless brushless linear motor driven poppet valve as defined in claim 1, wherein: the valve core (7) is a flat cover plate, the outer diameter of the valve core (7) is larger than the inner diameter of the air inlet (91), and the outer diameter of the valve core (7) is smaller than the inner diameter of the air outlet (92).

5. A weldless brushless linear motor driven poppet valve as defined in claim 1, wherein: and a limiting bulge (11) which is used for limiting the positions of the driving block (2) and the shaft coupling (3) so as to ensure that the output shaft of the brushless linear motor (1) can extend out by a certain length is further downwards arranged on the valve body (9) which is positioned right below the brushless linear motor (1).

6. A weldless brushless linear motor driven poppet valve as defined in claim 1, wherein: the novel air valve is characterized in that a stepped hole (93) communicated with the air inlet (91) is formed in the valve body (9), the stepped hole (93) comprises a first stepped hole, a second stepped hole and a third stepped hole which are sequentially formed in the valve body (9) from top to bottom, and the air inlet (91) is communicated with the air outlet (92).

7. A weldless brushless linear motor driven poppet valve as defined in claim 6, wherein: a return structure which is used for ensuring that the central rod (10) and the valve core (7) can be restored to the original positions after the brushless linear motor (1) fails to control is arranged in the first step hole; the return structure comprises a return spring (8) which is sleeved on the periphery of the central rod (10), one end of the return spring is fixed to the bottom end of the coupler (3), and the other end of the return spring is fixed to the inner wall of the first stepped hole.

8. A weldless brushless linear motor driven poppet valve as defined in claim 6, wherein: and sealing guide structures which are used for playing a sealing role and guiding the central rod (10) are arranged in the second step hole and the third step hole.

9. A weldless brushless linear motor driven poppet valve as defined in claim 8, wherein: the sealing guide structure comprises a sealing ring (4) which is embedded in a second stepped hole and used for preventing high-temperature gas from channeling upwards to avoid damage of the brushless linear motor (1) due to overhigh temperature and a guide sleeve (5) which is embedded in the second stepped hole and located under the sealing ring (4) and used for guiding a central rod (10), the central rod (10) penetrates through the sealing ring (4) and is assembled with the sealing ring (4) in a sliding sealing mode, and the central rod (10) penetrates through the guide sleeve (5).

10. A weldless brushless linear motor driven poppet valve as defined in claim 9, wherein: the utility model discloses a lift valve, including uide bushing (5), uide bushing (5) and fixed bottom of uide bushing (5) are equipped with in the third ladder hole, the bottom mounting of uide bushing (5) is provided with and is used for driving away when well core rod (10) reciprocates and adheres to soot particulate matter on well core rod (10) in order to ensure that poppet valve can not block dead scraper blade (6), the bottom of scraper blade (6) inwards buckle and with have certain clearance between well core rod (10).