CN112112727A

CN112112727A - Pneumatic actuator and turbocharger

Info

Publication number: CN112112727A
Application number: CN202010888709.5A
Authority: CN
Inventors: 李文军; 刘玉峰; 周峥; 封金虎; 许洪
Original assignee: Hunan Tianyan Machinery Co Ltd
Current assignee: Hunan Tianyan Machinery Co Ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2020-12-22

Abstract

The invention discloses a pneumatic actuator and a turbocharger, wherein the pneumatic actuator comprises a shell, a flexible diaphragm and an execution assembly, the flexible diaphragm is arranged in the shell and divides the space in the shell into a pressure cavity and a piston cavity, the shell is provided with an air tap communicated with the pressure cavity, the execution assembly is arranged in the piston cavity and matched with the flexible diaphragm, wherein: the actuating assembly comprises an inner piston shell, a connecting seat, a spring and a pull rope; the connecting seat is arranged on the inner piston shell, one end of the spring is abutted against the bottom of the shell, and the other end of the spring is abutted against the inner piston shell so as to press the inner piston shell against the flexible diaphragm; the bottom of the shell is provided with a through hole, one end of the stay cable is fixed on the connecting seat, and the other end of the stay cable penetrates out of the through hole to be connected with a gas discharge valve component of the turbocharger. The invention discloses a pneumatic actuator and a turbocharger, and aims to solve the technical problems that the existing actuator is limited in arrangement space and is not beneficial to the miniaturization of the volume of a supercharger assembly.

Description

Pneumatic actuator and turbocharger

Technical Field

The invention relates to the field of turbocharging, in particular to a pneumatic actuator and a turbocharger.

Background

The turbocharger drives a turbine to do work by using the energy of exhaust gas, and the turbine rotates at a high speed to drive a coaxial compressor impeller to work, so that the air inlet pressure is improved, and the air inlet amount is increased. When the engine is in low speed and large load, the work energy of the turbocharger is insufficient, and the air release valve is in a fully closed state; when the engine is in high speed and heavy load, the exhaust energy of the engine is sufficient, and the redundant exhaust energy generated by the work of the turbocharger needs to be discharged by opening the air release valve. The opening and closing of the exhaust valve of the turbocharger are controlled by a pneumatic actuator.

At present, an output end core rod assembly of a pneumatic actuator is a rigid piece, the actuator generally carries out reciprocating linear output through a shaft lever, and the rigid output mode leads the actuator to be only arranged in a circumferential plane of a rocker arm which is connected with and controls the opening degree of a deflation valve, so that the arrangement space is limited, and the miniaturization of the volume of a supercharger assembly is not facilitated. Moreover, because the actuator is arranged at the vortex end of the supercharger, the high cost is also required to be spent on the temperature-resistant protection material of the actuator.

In view of the above, it is necessary to provide a new pneumatic actuator and a new turbocharger to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a pneumatic actuator and a turbocharger, and aims to solve the technical problems that the existing actuator is limited in arrangement space and is not beneficial to the miniaturization of the volume of a supercharger assembly.

In order to achieve the purpose, the invention provides a pneumatic actuator, which comprises a shell, a flexible diaphragm and an actuating assembly, wherein the flexible diaphragm is arranged in the shell and divides the inner space of the shell into a pressure cavity and a piston cavity;

the actuating assembly comprises an inner piston shell, a connecting seat, a spring and a pull rope; the connecting seat is arranged on the inner piston shell, one end of the spring abuts against the bottom of the shell, and the other end of the spring abuts against the inner piston shell so as to press the inner piston shell against the flexible diaphragm; the bottom of the shell is provided with a through hole, one end of the stay cable is fixed on the connecting seat, and the other end of the stay cable penetrates out of the through hole to be connected with a gas discharge valve component of the turbocharger.

Preferably, the pneumatic actuator further comprises a base plate assembly and a spherical member, the base plate assembly is arranged between the spring and the bottom of the shell, a spherical hole opposite to the through hole is formed in the base plate assembly, the spherical member is in rotating fit with the spherical hole, and a limiting hole for the stay cable to pass through is formed in the spherical member.

Preferably, the backing plate component comprises a supporting plate and a sealing gasket arranged on the supporting plate, the supporting plate is fixed at the bottom of the shell, and the sealing gasket is made of rubber.

Preferably, the backing plate assembly further comprises a spring seat for fitting the spring, the spring seat being disposed between the sealing pad and the spring.

Preferably, the housing includes an upper shell and a lower shell, the flexible diaphragm is disposed between the upper shell and the lower shell, the upper shell and the flexible diaphragm enclose to form the pressure chamber, and the lower shell and the flexible diaphragm enclose to form the piston chamber.

Preferably, the air tap is riveted on the side wall of the upper shell.

Preferably, the top of the upper housing is recessed toward the flexible diaphragm.

Preferably, one end of the inhaul cable is provided with a T-shaped connecting part, and the connecting seat is provided with a T-shaped groove matched with the T-shaped connecting part.

Preferably, the T-shaped groove is further provided with a positioning pin hole, and the T-shaped connecting part is limited in the T-shaped groove through a pin.

In addition, the invention also provides a turbocharger which comprises a supercharger body and the pneumatic actuator, wherein the inhaul cable of the pneumatic actuator is connected with the air relief valve assembly of the supercharger body.

In the scheme of this application, pneumatic actuator includes casing, flexible diaphragm and executive component, and flexible diaphragm sets up in the casing and separates into pressure chamber and piston chamber with the casing inner space, and pressure gas passes through the air cock input pressure intracavity on the casing, thereby oppresses flexible diaphragm and produces deformation drive executive component towards the piston chamber. When the actuator works, gas input between the actuator shell and the flexible membrane overcomes the spring force of the spring to push the inner piston shell to move so as to drive the inhaul cable to output displacement, and the inhaul cable pulls the air discharge valve component to rotate, so that the air discharge valve of the turbocharger is controlled to be opened to a proper opening degree. Because the stay cable is a flexible part and can be bent at will in space, the actuator can be flexibly arranged according to the installation requirement and is not limited by the position requirement of the deflation valve component any more. The arrangement space of the turbocharger can be reduced, and the material cost of the actuator can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a pneumatic actuator according to an embodiment of the present invention;

FIG. 2 is a schematic view of a partial structure of a pneumatic actuator according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a housing of a pneumatic actuator according to an embodiment of the present invention;

FIG. 4 is a partial view of FIG. 2;

fig. 5 is a schematic cross-sectional view of a ball of a pneumatic actuator according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

The reference numbers illustrate:

100-housing, 110-pressure chamber, 120-piston chamber;

101-upper shell, 102-lower shell, 103-air nozzle and 104-through hole;

200-a flexible membrane;

310-inner piston shell, 320-connecting seat, 330-spring and 340-pull cable;

321-T-shaped groove, 322-positioning pin hole, 323-gasket;

400-a backing plate component, 410-a support plate, 420-a sealing gasket, 430-a spring seat;

500-ball-shaped piece.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 3, in order to achieve the above object, the present invention provides a pneumatic actuator, including a housing 100, a flexible diaphragm 200 and an actuating assembly, wherein the flexible diaphragm 200 is disposed in the housing 100 and divides a space in the housing 100 into a pressure chamber 110 and a piston chamber 120, the housing 100 is provided with an air nozzle 103 communicating with the pressure chamber 110, and the actuating assembly is disposed in the piston chamber 120 and cooperates with the flexible diaphragm 200, and is characterized in that:

the actuating assembly comprises an inner piston housing 310, a connecting seat 320, a spring 330 and a pull cable 340; the connecting seat 320 is disposed on the inner piston housing 310, one end of the spring 330 abuts against the bottom of the housing 100, and the other end of the spring 330 abuts against the inside of the inner piston housing 310, so as to press the inner piston housing 310 against the flexible diaphragm 200; the bottom of the housing 100 is formed with a through hole 104, one end of the cable 340 is fixed on the connecting seat 320, and the other end of the cable 340 penetrates out of the through hole 104 for connecting with a bleed valve assembly of the turbocharger.

Wherein, the pressure gas is input into the pressure chamber 110 through the gas nozzle 103 on the housing 100, and when the pressure in the pressure chamber 110 is too high, the flexible diaphragm 200 is pressed to deform toward the piston chamber 120. The deformed flexible diaphragm 200 drives the piston shell and the pull cable 340 to move downwards, and pulls the deflation valve assembly to rotate.

Wherein the spring 330 is used to press the piston housing against the flexible diaphragm 200, enabling the piston housing to follow the movement of the flexible diaphragm 200. When pressure in pressure chamber 110 is removed, spring 330 returns the piston housing.

Wherein, the connecting seat 320 is used for connecting the inner piston shell 310 and the pulling cable 340 into a whole. The pull cord 340 is preferably a steel cord that meets the stiffness and flexibility requirements for pulling the deflation valve assembly to rotate.

In the solution of the present application, the actuating component of the pneumatic actuator is a flexible cable 340, and when the actuator is in operation, the gas input between the actuator housing 100 and the flexible diaphragm 200 overcomes the force of the spring 330 to push the inner piston housing 310 to move, so as to drive the cable 340 to displace. The cable 340 pulls the bleed valve assembly to rotate, thereby controlling the turbocharger bleed valve to open by the proper amount. Because the cable 340 is a flexible member that can be bent at will, the actuator can be flexibly arranged according to installation requirements, and is not limited by the position requirement of the deflation valve assembly. The arrangement space of the turbocharger can be reduced, and the material cost of the actuator can be reduced.

It should be noted that the present invention is illustrated in the drawings by taking a positive pressure pneumatic actuator as an example, but the present invention is not limited thereto, and the actuator structure according to the present invention should fall within the scope of the present invention as long as the actuator structure can be used. Such as negative pressure pneumatic actuators and other types of actuators.

Referring to fig. 2, as an embodiment of the present invention, the pneumatic actuator further includes a pad assembly 400 and a ball 500, the pad assembly 400 is disposed between the spring 330 and the bottom of the housing 100, a ball hole facing the through hole 104 is formed in the pad assembly 400, the ball 500 is rotatably engaged with the ball hole, and a limiting hole for the cable 340 to pass through is formed in the ball 500. In this embodiment, after the actuator is replaced by the flexible cable 340, friction is generated between the cable 340 and the housing 100 during the actuation process. To avoid breakage of the traction cable 340 due to wear, a pad assembly 400 and a ball 500 may be provided. The pad assembly 400 is disposed between the spring 330 and the bottom of the housing 100, and is internally provided with a ball 500, through which the cable 340 passes. Since the ball 500 can rotate following the deformation of the cable 340, the friction between the cable 340 and the housing 100 is transferred to the friction between the ball 500 and the housing 100 and the pad assembly 400, thereby preventing the cable 340 from being worn. Referring to fig. 5, the spherical member 500 is preferably a steel ball structure, and both ends of the inner hole of the steel ball may be provided with smoothly transitional skirts to prevent the sharp edge from wearing the cable 340 during the operation of the cable 340.

Further, the backing plate assembly 400 includes a supporting plate 410 and a gasket 420 disposed on the supporting plate 410, wherein the supporting plate 410 is fixed to the bottom of the casing 100, and the gasket 420 is made of rubber. In this embodiment, the gasket 420 serves for dust prevention. The specific material of the supporting plate 410 is not limited, and the supporting plate 410 may be screwed to the bottom of the housing 100. The supporting plate 410 and the sealing pad 420 are respectively provided with a hemispherical hole, and a spherical hole is formed by enclosing. Further, the backing plate assembly 400 may further include a spring seat 430 for engaging the spring 330, the spring seat 430 being disposed between the gasket 420 and the spring 330 for making the spring 330 more stably installed.

Referring to fig. 3, as an embodiment of the present invention, the housing 100 may include an upper shell 101 and a lower shell 102, the flexible diaphragm 200 is disposed between the upper shell 101 and the lower shell 102, the upper shell 101 and the flexible diaphragm 200 enclose to form a pressure chamber 110, and the lower shell 102 and the flexible diaphragm 200 enclose to form a piston chamber 120. The upper shell 101 and the lower shell 102 are used for sealing the flexible membrane 200 after flanging and riveting. Wherein, air cock 103 is riveted on the side wall of upper shell 101 and is communicated with pressure chamber 110. Preferably, the top of the upper casing 101 is recessed toward the flexible membrane 200. So that the volume of the pressure chamber 110 becomes smaller and the flexible membrane 200 is deformed to a greater extent by the same volume of gas.

Referring to fig. 4, as a preferred embodiment of the present invention, one end of the pulling cable 340 may be provided with a T-shaped connecting portion, and the connecting seat 320 is provided with a T-shaped groove 321 engaged with the T-shaped connecting portion. The T-shaped connection portion of the cable 340 is inserted into the T-shaped groove 321 of the coupling seat 320. The connecting seat 320 may be fixed to the inner piston housing 310 by a spacer, and may be fixed to the inner piston housing 310 by a washer 323. Furthermore, the T-shaped groove 321 is further provided with a positioning pin hole 322, and the T-shaped connecting portion is limited in the T-shaped groove 321 through a pin, so that assembly is facilitated.

The utility model provides a turbo charger is owing to adopted pneumatic actuator as above, and pneumatic actuator includes casing, flexible diaphragm and executive component, and flexible diaphragm sets up in the casing and separates into pressure chamber and piston chamber with the casing inner space, and pressure gas passes through the air cock input pressure intracavity on the casing, oppresses flexible diaphragm thereby the drive executive component produces deformation towards the piston chamber. When the actuator works, gas input between the actuator shell and the flexible membrane overcomes the spring force of the spring to push the inner piston shell to move so as to drive the inhaul cable to output displacement, and the inhaul cable pulls the air discharge valve component to rotate, so that the air discharge valve of the turbocharger is controlled to be opened to a proper opening degree. Because the stay cable is a flexible part and can be bent at will in space, the actuator can be flexibly arranged according to the installation requirement and is not limited by the position requirement of the deflation valve component any more. The arrangement space of the turbocharger can be reduced, and the material cost of the actuator can be reduced.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a pneumatic actuator, includes casing, flexible diaphragm and executive component, flexible diaphragm set up in the casing and will pressure chamber and piston chamber are separated into to the casing inner space, be provided with the intercommunication on the casing the air cock of pressure chamber, executive component set up in the piston chamber and with the cooperation of flexible diaphragm, its characterized in that:

2. The pneumatic actuator according to claim 1, further comprising a pad plate assembly and a spherical member, wherein the pad plate assembly is disposed between the spring and the bottom of the housing, a spherical hole facing the through hole is formed in the pad plate assembly, the spherical member is rotatably engaged with the spherical hole, and a limit hole for the cable to pass through is formed in the spherical member.

3. The pneumatic actuator of claim 2, wherein the pad assembly comprises a support plate and a gasket disposed on the support plate, the support plate is fixed to the bottom of the housing, and the gasket is made of rubber.

4. The pneumatic actuator of claim 3, wherein the bolster assembly further includes a spring seat for engaging the spring, the spring seat disposed between the seal and the spring.

5. The pneumatic actuator of any one of claims 1 to 4, wherein the housing comprises an upper shell and a lower shell, the flexible diaphragm is disposed between the upper shell and the lower shell, the upper shell and the flexible diaphragm enclose the pressure chamber, and the lower shell and the flexible diaphragm enclose the piston chamber.

6. The pneumatic actuator of claim 5, wherein the air cap is riveted to the sidewall of the upper housing.

7. The pneumatic actuator of claim 5, wherein a top of the upper housing is recessed toward the flexible diaphragm.

8. The pneumatic actuator according to any one of claims 1 to 4, wherein one end of the pull cable is provided with a T-shaped connecting part, and the connecting seat is provided with a T-shaped groove matched with the T-shaped connecting part.

9. The pneumatic actuator according to claim 8, wherein the T-shaped groove is further provided with a positioning pin hole, and the T-shaped connecting part is limited in the T-shaped groove by a pin.

10. A turbocharger comprising a supercharger body and a pneumatic actuator as claimed in any one of claims 1 to 9, the cable of the pneumatic actuator being connected to a bleed valve assembly of the supercharger body.