CN218935453U

CN218935453U - Pneumatic actuator

Info

Publication number: CN218935453U
Application number: CN202223319276.5U
Authority: CN
Inventors: 汪萍; 王乐
Original assignee: Faist Emission Controls Suzhou Co ltd
Current assignee: Faist Emission Controls Suzhou Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-04-28
Anticipated expiration: 2032-12-09

Abstract

The utility model relates to a pneumatic actuator, which comprises a shell, a transmission assembly, a push rod, an elastic diaphragm and an extension assembly, wherein the transmission assembly is arranged on the shell; the top end of the shell is provided with an air inlet pipe, the edge of the elastic diaphragm is connected with the inner side wall of the shell, the interior of the shell is divided into a first accommodating space and a second accommodating space, the first accommodating space is communicated with the air inlet pipe, and the transmission assembly is arranged in the second accommodating space; one end of the push rod penetrates through the bottom of the shell and is connected with the transmission assembly, and the other end of the push rod is connected with the extension assembly; the extension assembly comprises a nut and an extension sleeve rod, the nut is connected with the push rod through threads, and one end of the extension sleeve rod is sleeved at the lower end part of the push rod through threads and is fixed through the nut; the side wall of the extension sleeve rod is provided with an engagement part so that the extension sleeve rod is engaged with the push rod at the engagement part; the other end of the extension sleeve rod is provided with a through hole. The utility model can improve the stability of the connection between the extension component and the push rod, and ensure accurate and timely output power control after long-time operation.

Description

Pneumatic actuator

Technical Field

The utility model relates to the technical field of actuators, in particular to a pneumatic actuator.

Background

The existing turbocharger generally adopts a pneumatic actuator to ensure that the engine obtains sufficient air supply in a low-speed range and a medium-speed range, so that the air supply is suitable for the fuel supply increased by the turbocharger in a combustion chamber, the low-speed torque is increased, the fuel combustion utilization rate is improved, and the excessive combustion pressure in a cylinder caused by overspeed of a rotor of the turbocharger or excessive boost pressure is avoided through exhaust gas in a high-speed range, thereby exacerbating the mechanical load of the engine and the like. That is, the turbocharger adopts an exhaust gas release valve, and the important point is to improve the low-speed torque characteristic of the engine and simultaneously consider the performance index and the use reliability of the engine during high-speed operation.

The pneumatic actuator is opened and closed by the boost pressure, the boost pressure of the air compressor outlet is introduced into the closed pressure chamber of the air discharge valve regulator, when the boost pressure reaches or exceeds a specified value, the diaphragm of the air discharge valve regulator overcomes the spring force and moves together with the linkage push rod to push the rocker arm to rotate around the pin shaft, so that the air discharge valve is opened, the exhaust bypass is realized, and the rotation speed of the air discharge valve is controlled. The existing pneumatic actuator has the following problems: in the existing pneumatic actuator, most of linkage push rods are fixed in length and cannot be adjusted according to different turbochargers, the application range is limited, and the linkage push rods of the extension assemblies are partially added, so that the extension assemblies and the linkage push rods are easy to loosen under long-time operation, and the output moment is offset, so that the phenomenon of insufficient air supply of the turbochargers is caused. In view of the foregoing, it is desirable to develop a pneumatic actuator for solving the above-mentioned problems.

Disclosure of Invention

The utility model aims to solve the technical problems in the prior art and provide a pneumatic actuator which can adjust the length of a push rod according to different turbochargers, enlarge the application range, improve the stability of connection between an extension assembly and the push rod and ensure accurate and timely output power control after long-time operation.

According to the technical scheme provided by the utility model, the pneumatic actuator comprises a shell, a transmission assembly, a push rod, an elastic diaphragm and an extension assembly; the top end of the shell is provided with an air inlet pipe, the edge of the elastic diaphragm is connected with the inner side wall of the shell to divide the interior of the shell into a first accommodating space and a second accommodating space, the first accommodating space is communicated with the air inlet pipe, and the transmission assembly is arranged in the second accommodating space; one end of the push rod penetrates through the bottom of the shell and is connected with the transmission assembly, and the other end of the push rod is connected with the extension assembly;

the extension assembly comprises a nut and an extension sleeve rod, the nut is connected with the push rod through threads, and one end of the extension sleeve rod is sleeved at the lower end part of the push rod through threads and is fixed through the nut; the side wall of the extension sleeve rod is provided with an engagement part, so that the extension sleeve rod is engaged with the push rod at the engagement part; and the other end of the extension sleeve rod is provided with a through hole.

In one embodiment of the present utility model, the engagement portion is formed by punching, so that the extension rod is engaged with the push rod.

In one embodiment of the utility model, the device comprises two meshing parts which are symmetrically arranged at two sides of the axis of the extension sleeve rod.

In one embodiment of the utility model, the housing comprises a first housing and a second housing, wherein a bottom edge of the first housing is provided with a circle of first skirt part, and the first skirt part is integrally arranged with the first housing and extends outwards from the bottom of the first housing;

the top edge of the second shell is provided with a circle of second skirt part, the second skirt part is integrally arranged with the second shell and extends outwards from the top of the second shell, the outer side edge of the second skirt part is bent upwards and extends reversely, and the second skirt part covers the first skirt part.

In one embodiment of the utility model, the edge of the elastic membrane is embedded between the first skirt and the second skirt and is interference fit with the first skirt and the second skirt.

In one embodiment of the utility model, the elastic membrane is made of a flexible, dense material.

In one embodiment of the utility model, the thickness of the elastic membrane is gradually increased in a radial direction of the elastic membrane.

In one embodiment of the utility model, the transmission assembly comprises a first limiting cover, a second limiting cover and a spring, wherein the spring is abutted between the first limiting cover and the second limiting cover, the elastic diaphragm covers the first limiting cover, and the second limiting cover is positioned right below the first limiting cover.

In one embodiment of the present utility model, the outer peripheral edge of the second limiting cover is bent obliquely upward and then bent obliquely downward to sequentially form a spring limiting portion and a cover limiting portion, the bottom of the return spring is limited to the inner side of the spring limiting portion, and the cover limiting portion abuts against the side wall of the housing.

In one embodiment of the utility model, the device further comprises a sealing ring sleeved on the push rod, and the inner periphery and the outer periphery of the sealing ring are respectively abutted against the push rod and the second limiting cover.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

the utility model is provided with the extension component, so that the length of the push rod can be adjusted according to different turbochargers, and the application range is enlarged; the extension sleeve rod is meshed with the push rod, so that the stability of connection of the extension assembly and the push rod is improved, and accurate and timely output power control is ensured after long-time operation.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.

FIG. 1 is a three-dimensional block diagram of a pneumatic actuator of the present utility model;

FIG. 2 is a longitudinal cross-sectional view of the pneumatic actuator of the present utility model;

fig. 3 is an enlarged view of a portion of fig. 2a of the present utility model.

Description of the specification reference numerals: 1-a first housing; 2-a second housing; 3-an air inlet pipe; 4-an elastic membrane; 5-a first limiting cover; 6-a spring; 7-a second limiting cover; 8-a sealing ring; 9-a gasket; 10-positioning columns; 11-protecting sleeves; 12-pushing rod; 13-a nut; 14-extending the loop bar; 15-engagement; 16-through holes.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

Referring to fig. 1, in order to expand the range of use, improve the stability of connection of the extension assembly and the push rod 12, ensure accurate and timely output power control after long-time operation, the utility model comprises a housing, a transmission assembly, the push rod 12, an elastic diaphragm 4 and the extension assembly; the top end of the shell is provided with an air inlet pipe 3, the edge of the elastic diaphragm 4 is connected with the inner side wall of the shell to divide the interior of the shell into a first accommodating space and a second accommodating space, the first accommodating space is communicated with the air inlet pipe 3, and the transmission assembly is arranged in the second accommodating space; one end of the push rod 12 penetrates through the bottom of the shell and is connected with the transmission assembly, and the other end of the push rod is connected with the extension assembly;

the extension assembly comprises a nut 13 and an extension sleeve rod 14, the nut 13 is connected with the push rod 12 through threads, and one end of the extension sleeve rod 14 is sleeved at the lower end part of the push rod 12 through threads and is fixed through the nut 13; an engagement portion 15 is provided on a side wall of the extension rod 14 so that the extension rod 14 and the push rod 12 are engaged at the engagement portion 15; the other end of the extension pole 14 is provided with a through hole 16.

Specifically, when the pneumatic actuator works, air is introduced through the air inlet pipe 3, after entering the first accommodating space, the elastic diaphragm 4 is extruded downwards, the transmission component below the elastic diaphragm 4 is compressed accordingly, the push rod 12 in transmission connection with the transmission component realizes the required displacement, and the specific working principle and process are consistent with the prior art and are not repeated here. The pneumatic actuator is provided with the extension assembly, the length of the push rod 12 can be adjusted according to different turbochargers, the application range is enlarged, the extension assembly comprises the extension sleeve rod 14, the extension sleeve rod 14 is a hollow rod, threads are arranged in the hollow rod, the extension sleeve rod 14 is connected with the lower end part of the push rod 12 through the threads, the length of the connecting part of the extension sleeve rod 14 and the push rod 12 can be adjusted to adjust the whole length of the pneumatic actuator, and after the length is adjusted to a required length, the position of the extension sleeve is fixed through the nut 13. However, under the condition of long-time operation, the nut 13 is easy to loosen, the output torque is offset, and the phenomenon of insufficient air supply of the turbocharger is caused, and the like, so that after the extension sleeve is fixed by the nut 13, the extension sleeve 14 is meshed with the push rod 12 by using a meshing tool, and threads on the extension sleeve 14 and the push rod 12 at the meshing part 15 are extruded, so that the extension sleeve 14 and the push rod 12 are fixedly connected. The through hole 16 in the extension rod 14 is used for connecting with a rocker arm, and is in particular consistent with the prior art, and will not be described in detail here.

Further, the engagement portion may be formed by punching, so that the extension rod is engaged with the push rod.

Further, the telescopic rod comprises two meshing parts which are symmetrically arranged on two sides of the axis of the telescopic rod. In the concrete implementation, the meshing parts can be arranged at two sides of the axis of the extension sleeve rod in a staggered mode, and the specific positions and the number of the meshing parts can be selected according to actual needs so as to achieve the aim of fixedly connecting the extension sleeve rod and the push rod.

Further, as shown in fig. 2, the housing includes a first housing 1 and a second housing 2, wherein a bottom edge of the first housing 1 is provided with a first skirt portion, and the first skirt portion is integrally provided with the first housing 1 and extends from the bottom of the first housing 1 to the outside of the housing;

the top edge of the second shell 2 is provided with a circle of second skirt part, the second skirt part is integrally arranged with the second shell 2 and extends outwards from the top of the second shell 2, the outer side edge of the second skirt part is bent upwards and extends reversely, and the second skirt part covers the first skirt part.

The edge of the elastic membrane 4 is embedded between the first skirt and the second skirt and is in interference fit with the first skirt and the second skirt.

Specifically, a proper gap is kept between the first skirt and the second skirt, the bottom edge of the elastic diaphragm 4 is bent outwards to form a diaphragm skirt, and the diaphragm skirt is embedded into the gap and is in interference fit with the first skirt and the second skirt respectively, so that the diaphragm skirt keeps sealing with the first skirt and the second skirt continuously.

Further, the elastic diaphragm 4 is made of a flexible compact material, and the elastic diaphragm 4 may be made of any one of neoprene, nitrile rubber, and butyl rubber.

Further, the thickness of the elastic diaphragm 4 gradually increases in the radial direction of the elastic diaphragm 4.

Specifically, with the adoption of the structure, the integrity of the elastic diaphragm 4 is improved, and the diaphragm skirt can be pressed by the first skirt and the second skirt, and can still keep good sealing performance with the first skirt and the second skirt after being repeatedly and continuously pulled by air pressure, and meanwhile, the elastic diaphragm 4 can be prevented from getting out of the first skirt and the second skirt, so that the durability of the pneumatic actuator is improved.

Further, the transmission assembly comprises a first limiting cover 5, a second limiting cover 7 and a spring 6, wherein the spring 6 is abutted between the first limiting cover 5 and the second limiting cover 7, the elastic diaphragm 4 covers the first limiting cover 5, and the second limiting cover 7 is located under the first limiting cover 5.

The outer peripheral edge of the second limiting cover 7 is bent obliquely upwards and then bent obliquely downwards to sequentially form a spring 6 limiting part and a cover body limiting part, the bottom of the reset spring 6 is limited to the inner side of the spring 6 limiting part, and the cover body limiting part is abutted to the side wall of the shell.

The specific condition and the working principle of the transmission assembly are consistent with the prior art, and the detailed description is omitted here.

Further, the novel sealing device further comprises a sealing ring 8, the sealing ring 8 is sleeved on the push rod 12, and the inner periphery and the outer periphery of the sealing ring 8 are respectively kept sealed with the push rod 12 and the second limiting cover 7.

Further, a liner is arranged at the bottom of the shell, a protective sleeve 11 is connected to the liner, and the protective sleeve 11 is sleeved on the push rod 12. At least two positioning columns 10 extending vertically downwards are fixedly connected to the gasket.

Specifically, the protection sleeve 11 is used for preventing dust or larger sundries from entering the shell to damage the elastic diaphragm 4, the gasket 9 is connected between the shell and the positioning column 10, and the positioning column 10 is used for connecting the pneumatic actuator and the turbocharger.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims

1. A pneumatic actuator, characterized by: comprises a shell, a transmission component, a push rod, an elastic diaphragm and an extension component; the top end of the shell is provided with an air inlet pipe, the edge of the elastic diaphragm is connected with the inner side wall of the shell to divide the interior of the shell into a first accommodating space and a second accommodating space, the first accommodating space is communicated with the air inlet pipe, and the transmission assembly is arranged in the second accommodating space; one end of the push rod penetrates through the bottom of the shell and is connected with the transmission assembly, and the other end of the push rod is connected with the extension assembly;

2. The pneumatic actuator of claim 1, wherein: the engagement portion is formed by punching, so that the extension rod is engaged with the push rod.

3. The pneumatic actuator of claim 1, wherein: the two meshing parts are symmetrically arranged on two sides of the axis of the extension sleeve rod.

4. The pneumatic actuator of claim 1, wherein: the shell comprises a first shell and a second shell, wherein a circle of first skirt parts are arranged at the bottom edge of the first shell, are integrally arranged with the first shell and extend outwards from the bottom of the first shell;

5. The pneumatic actuator of claim 4, wherein: the edge of the elastic diaphragm is embedded between the first skirt part and the second skirt part and is in interference fit with the first skirt part and the second skirt part.

6. The pneumatic actuator of claim 1, wherein: the elastic diaphragm is made of a flexible dense material.

7. The pneumatic actuator of claim 1, wherein: the thickness of the elastic diaphragm gradually increases in the radial direction of the elastic diaphragm.

8. The pneumatic actuator of claim 1, wherein: the transmission assembly comprises a first limiting cover, a second limiting cover and a spring, wherein the spring is abutted between the first limiting cover and the second limiting cover, the elastic diaphragm covers the first limiting cover, and the second limiting cover is located under the first limiting cover.

9. The pneumatic actuator of claim 8, wherein: the outer peripheral edge of the second limiting cover is bent obliquely upwards and then bent obliquely downwards to sequentially form a spring limiting part and a cover limiting part, the bottom of the spring is limited to the inner side of the spring limiting part, and the cover limiting part is abutted to the side wall of the shell.

10. The pneumatic actuator of claim 8, wherein: the sealing ring is sleeved on the push rod, and the inner periphery and the outer periphery of the sealing ring are respectively abutted against the push rod and the second limiting cover.