CN210033619U

CN210033619U - Pneumatic actuator

Info

Publication number: CN210033619U
Application number: CN201920926539.8U
Authority: CN
Inventors: 郭伟
Original assignee: Fiesta Emission Control Equipment Suzhou Co Ltd
Current assignee: Fiesta Emission Control Equipment Suzhou Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-02-07
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a pneumatic actuator, include: a lower case opened at an upper portion thereof to form an opening; an upper housing shaped and sized to fit over the open top of the lower housing to form a seal and form a closed containment space therebetween; the transmission assembly is arranged in the closed accommodating space, a transmission connecting rod is connected in the transmission assembly in a transmission mode, a pressing diaphragm is arranged in the closed accommodating space, and the periphery of the pressing diaphragm is connected with the side wall of the closed accommodating space in a sealing mode. The transmission connecting rod vertically extends downwards until penetrating out of the bottom of the lower shell. According to the utility model discloses, it has improved pneumatic actuator's leakproofness when simplifying pneumatic actuator assembly structure, has reduced reset spring's the spacing clearance of installation, guarantees that pneumatic actuator has accurate, timely power take off control.

Description

Pneumatic actuator

Technical Field

The utility model relates to an executor field, in particular to pneumatic actuator.

Background

The existing turbocharger generally adopts a pneumatic actuator to ensure that the engine obtains sufficient air supply in low and medium speed ranges, so that the engine can adapt to 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, the mechanical load of the engine and the like caused by the overspeed of a supercharger rotor or the overhigh supercharging pressure in a high-speed range are avoided through exhaust and air release. That is, the turbocharger adopts the exhaust bleed valve, and the emphasis is to improve the low-speed torque characteristic of the engine and simultaneously give consideration to the performance index and the use reliability of the engine during high-speed running.

The opening and closing of the pneumatic actuator is automatically controlled by the boost pressure, the boost pressure at the outlet of the compressor is introduced into a closed pressure chamber of the air bleeding valve regulator, when the boost pressure reaches or exceeds a specified value, the diaphragm 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 bleeding valve is opened, the air bleeding of the exhaust bypass is realized, and the increase of the rotating speed of the supercharger is controlled.

The existing pneumatic actuator has the following problems: firstly, the existing pneumatic actuator has poor shell sealing performance, and is easy to break the seal when being in a high-temperature operation environment for a long time, so that the power transmission of the pneumatic actuator has a hysteresis phenomenon; secondly, in the conventional pneumatic actuator, the mounting limit clearance of the return spring is large, and after long-time operation, the output torque deviation caused by the position dislocation of the return spring is easy to occur, so that the phenomenon of insufficient supply of the air supply quantity of the turbocharger is caused.

In view of the above, it is necessary to develop a pneumatic actuator to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The weak point that exists among the prior art, the utility model aims at providing a pneumatic actuator, it is when simplifying pneumatic actuator assembly structure, has still improved pneumatic actuator's leakproofness, in addition, has still reduced reset spring's the spacing clearance of installation, can guarantee that pneumatic actuator still has accurate, timely power take off control after long-time work.

In order to achieve the above objects and other advantages in accordance with the present invention, there is provided a pneumatic actuator including:

a lower case opened at an upper portion thereof to form an opening;

an upper housing shaped and sized to fit over the open top of the lower housing to form a seal and form a closed containment space therebetween;

the transmission assembly is arranged in the closed accommodating space and is in transmission connection with a transmission connecting rod,

wherein, be equipped with down and press the diaphragm in the airtight accommodation space, press down the diaphragm the periphery with airtight accommodation space's lateral wall sealing connection in order will airtight accommodation space cuts apart into accommodation space and lower accommodation space down, drive assembly locates among the lower accommodation space, the vertical downwardly extending of drive connecting rod is worn out until the bottom from casing down.

Preferably, the upper housing is communicatively provided with an intake duct leading to the upper accommodation space.

Preferably, the push down membrane is made of a flexible dense material.

Preferably, the outer periphery of the upper case is formed with an upper skirt portion integrally joined to the upper case at a bottom edge of the upper case and extending outwardly from the outer periphery of the upper case.

Preferably, the outer periphery of the lower case is formed with a ring of lower skirt integrally joined thereto at a top edge thereof and extending horizontally outward from the outer periphery of the lower case, wherein an outer edge of the lower skirt is bent upward and extended reversely to form an extension section in which the upper skirt is wrapped.

Preferably, the upper skirt portion and the lower skirt portion maintain a proper gap, the bottom edge of the pressing diaphragm is bent outwards to form a diaphragm skirt portion, and the diaphragm skirt portion is embedded into the gap and maintains interference fit with the upper skirt portion and the lower skirt portion respectively, so that the diaphragm skirt portion maintains continuous sealing with the upper skirt portion and the lower skirt portion.

Preferably, the thickness of the diaphragm skirt is gradually increased from the inside to the outside in the radial direction thereof.

Preferably, the transmission assembly includes:

an upper limit cap that is open at its bottom and is located directly below the lower pressure diaphragm;

the lower limit cover and the upper limit cover are arranged at intervals and are positioned right below the upper limit cover; and

and the reset spring is arranged between the upper limit cover and the lower limit cover, and the upper end and the lower end of the reset spring are respectively kept in continuous contact with the upper limit cover and the lower limit cover.

Preferably, the return spring penetrates from the bottom of the upper limit cover until abutting against the top wall of the upper limit cover, the central area of the lower limit cover bulges upwards to form a bottom sealing space below the lower surface of the lower limit cover, the transmission connecting rod is fixedly connected with the top wall of the upper limit cover, and the transmission connecting rod penetrates from the bottom sealing space and then penetrates out from the bottom of the lower shell.

Preferably, be equipped with the cover in the bottom seal space and locate the bottom sealing washer of transmission connecting rod, the interior periphery of bottom sealing washer respectively with transmission connecting rod reaches spacing cover keeps sealed down, the neighboring of spacing cover is buckled to the slope after upwards buckling to the slope earlier in order to form spacing portion of spring and the spacing portion of the cover body in proper order down, reset spring's bottom by the restriction in the inboard of the spacing portion of spring, the periphery of the spacing portion of the cover body with the lateral wall of spacing cover keeps in contact down.

Compared with the prior art, the utility model, its beneficial effect is: the pneumatic actuator assembly structure is simplified, meanwhile, the sealing performance of the pneumatic actuator is improved, in addition, the installation limiting gap of the reset spring is reduced, and the pneumatic limiter can be guaranteed to have accurate and timely power output control after long-time work.

Drawings

Fig. 1 is a three-dimensional structural view of a pneumatic actuator according to the present invention;

fig. 2 is a longitudinal cross-sectional view of a pneumatic actuator according to the present invention;

fig. 3 is a longitudinal cross-sectional view of a drive assembly in a pneumatic actuator according to the present invention;

fig. 4 is a longitudinal sectional view of a lower limit guard in a pneumatic actuator according to the present invention.

Detailed Description

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a more detailed description of the present invention, which will enable those skilled in the art to make and use the present invention. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

Referring to fig. 1 to 4, the pneumatic actuator 1 includes:

a lower case 12, the lower case 12 being opened at an upper portion thereof to form an opening;

an upper case 11, the upper case 11 being shaped and sized to fit into the open top of the lower case 12 to form a seal, and forming a closed receiving space therebetween;

a transmission component 16, wherein the transmission component 16 is arranged in the closed accommodating space, and a transmission connecting rod 14 is connected in the transmission component 16 in a transmission way,

the closed accommodating space is internally provided with a downward pressing diaphragm 15, the periphery of the downward pressing diaphragm 15 is hermetically connected with the side wall of the closed accommodating space so as to divide the closed accommodating space into an upper accommodating space and a lower accommodating space, the transmission assembly 16 is arranged in the lower accommodating space, and the transmission connecting rod 14 vertically extends downwards until penetrating out of the bottom of the lower shell 12.

Further, the upper case 11 is communicatively provided with an intake pipe 13 leading to the upper accommodation space.

Further, the lower pressing diaphragm 15 is made of a flexible dense material. In a preferred embodiment, the lower pressure membrane 15 is made of any one of neoprene, nitrile rubber, and butyl rubber.

Referring to fig. 2, the outer circumference of the upper case 11 is formed with a ring of upper skirt 111, and the upper skirt 111 is integrally coupled to the upper case 11 at a bottom edge of the upper case 11 and extends outward from the outer circumference of the upper case 11.

Further, the outer circumference of the lower case 12 is formed with a ring of lower skirt 121, the lower skirt 121 is integrally joined to the lower case 12 at the top edge of the lower case 12 and extends horizontally outward from the outer circumference of the lower case 12, wherein the outer edge of the lower skirt 121 is bent upward and extended reversely to form an extension 1211 enclosing the upper skirt 111 therein.

Further, the upper skirt portion 111 and the lower skirt portion 121 maintain a proper gap, the bottom edge of the lower pressing membrane 15 is bent outward to form a membrane skirt portion 151, and the membrane skirt portion 151 is inserted into the gap and maintains an interference fit with the upper skirt portion 111 and the lower skirt portion 121, respectively, so that the membrane skirt portion 151 maintains a continuous seal with the upper skirt portion 111 and the lower skirt portion 121.

In a preferred embodiment, the thickness of the diaphragm skirt 151 gradually increases from inside to outside in the radial direction, and with this structure, while the integrity of the push-down diaphragm 15 is increased, the diaphragm skirt 151 can be pressed by the upper skirt 111 and the lower skirt 121, and after repeated and continuous pulling of the air pressure, the diaphragm skirt can still maintain good sealing performance with the upper skirt 111 and the lower skirt, and the push-down diaphragm 15 can be prevented from breaking loose from the upper skirt 111 and the lower skirt 121, thereby improving the durability of the pneumatic actuator 1.

Referring to fig. 3, the transmission assembly 16 includes:

an upper limit cap 163, the upper limit cap 161 being open at its bottom and located directly below the lower pressing diaphragm 15;

the lower limit cover 162 is arranged at an interval with the upper limit cover 161 and is positioned right below the upper limit cover 161; and

and a return spring 161, wherein the return spring 161 is disposed between the upper limit cover 163 and the lower limit cover 162, and upper and lower ends of the return spring 161 are respectively kept in continuous contact with the upper limit cover 163 and the lower limit cover 162.

Further, the return spring 161 penetrates from the bottom of the upper limit cover 163 until abutting against the top wall of the upper limit cover 163, the central area of the lower limit cover 162 bulges upward to form a bottom sealing space 1621 below the lower surface thereof, the transmission link 14 is fixedly connected with the top wall of the upper limit cover 163, and the transmission link 14 penetrates from the bottom of the lower housing 12 after penetrating through the bottom sealing space 1621.

Referring to fig. 4, a bottom sealing ring 164 sleeved on the transmission connecting rod 14 is arranged in the bottom sealing space 1621, the inner periphery of the bottom sealing ring 164 is respectively sealed with the transmission connecting rod 14 and the lower limiting cover 162, the peripheral edge of the lower limiting cover 162 is bent obliquely upwards and then obliquely downwards to form a spring limiting portion 1622 and a cover limiting portion 1623 in sequence, the bottom of the return spring 161 is limited to the inner side of the spring limiting portion 1622, and the periphery of the cover limiting portion 1623 is in contact with the side wall of the lower limiting cover 162. By adopting the structure, the transmission connecting rod 14 can still ensure better verticality after long-time operation, prevent the deflection of the output force direction thereof to generate deflection torque, and further reduce the damage to the turbocharger.

Further, the included angle between the spring limiting part 1622 and the horizontal plane is an angle α, the included angle between the cover limiting part 1623 and the spring limiting part 1622 is an angle β, the angle α is equal to or larger than 115 degrees and equal to or smaller than α degrees and equal to or smaller than 135 degrees, and the angle β is equal to or larger than 45 degrees and equal to or larger than β degrees and equal to or smaller than 75 degrees.

Referring to fig. 2, an upper liner 123 lined below the lower limit cover 162 is disposed on the upper surface of the bottom wall of the lower housing 12, a lower liner 124 is disposed on the lower surface of the bottom wall of the lower housing 12, a protective sleeve 141 sleeved on the transmission link 14 is connected to the lower liner 124, and at least two positioning pillars 122 extending vertically and downwardly are fixedly connected to the lower liner 124.

The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application suitable for this invention, and further modifications may be readily made by those skilled in the art, and the invention is therefore not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A pneumatic actuator, comprising:

a lower case (12), the lower case (12) being open at an upper portion thereof to form an opening;

an upper housing (11), the upper housing (11) shaped and sized to fit into the open top of the lower housing (12) to form a seal and form a closed containment space therebetween;

the transmission assembly (16) is arranged in the closed accommodating space, and a transmission connecting rod (14) is connected in the transmission assembly (16) in a transmission manner;

wherein, be equipped with in the airtight accommodation space and push down diaphragm (15), push down the periphery of diaphragm (15) with airtight accommodation space's lateral wall sealing connection in order will airtight accommodation space cuts apart into accommodation space and lower accommodation space, drive assembly (16) are located under among the accommodation space, vertical downwardly extending of transmission connecting rod (14) is until following the bottom of casing (12) is worn out down.

2. The pneumatic actuator according to claim 1, wherein the upper housing (11) is communicatively provided with an intake pipe (13) leading to the upper accommodation space.

3. Pneumatic actuator according to claim 1, wherein the lower pressure membrane (15) is made of a flexible dense material.

4. The pneumatic actuator according to claim 1, wherein the outer periphery of the upper housing (11) is formed with an upper skirt (111), the upper skirt (111) integrally joining the upper housing (11) at a bottom edge of the upper housing (11) and extending outward from the outer periphery of the upper housing (11).

5. The pneumatic actuator according to claim 4, wherein the outer periphery of the lower case (12) is formed with a ring of lower skirt (121), the lower skirt (121) integrally joined to the lower case (12) at a top edge of the lower case (12) and extending horizontally outward from the outer periphery of the lower case (12), wherein outer edges of the lower skirt (121) are bent upward and extended reversely to form an extension section (1211) enclosing the upper skirt (111) therein.

6. The pneumatic actuator of claim 5, wherein the upper skirt (111) and the lower skirt (121) maintain a suitable gap, and the bottom edge of the lower diaphragm (15) is bent outward to form a diaphragm skirt (151), the diaphragm skirt (151) fitting into the gap and maintaining an interference fit with the upper skirt (111) and the lower skirt (121), respectively, such that the diaphragm skirt (151) maintains a continuous seal with the upper skirt (111) and the lower skirt (121).

7. Pneumatic actuator according to claim 6, wherein the thickness of the diaphragm skirt (151) is at a potential of increasing thickness from the inside to the outside in its radial direction.

8. The pneumatic actuator according to claim 1, wherein the transmission assembly (16) comprises:

an upper limit shield (163), the upper limit shield (161) being open at its bottom and located directly below the lower pressure membrane (15);

the lower limit cover (162) and the upper limit cover (161) are arranged at intervals and are positioned right below the upper limit cover (161); and

the return spring (161) is arranged between the upper limit cover (163) and the lower limit cover (162), and the upper end and the lower end of the return spring (161) are respectively kept in continuous contact with the upper limit cover (163) and the lower limit cover (162).

9. The pneumatic actuator according to claim 8, wherein the return spring (161) penetrates from the bottom of the upper limit housing (163) until abutting against the top wall of the upper limit housing (163), the central region of the lower limit housing (162) is bulged upward to form a bottom sealed space (1621) below the lower surface thereof, the transmission link (14) is fixedly connected to the top wall of the upper limit housing (163), and the transmission link (14) penetrates from the bottom of the lower housing (12) after penetrating through the bottom sealed space (1621).

10. The pneumatic actuator according to claim 9, wherein a bottom sealing ring (164) sleeved on the transmission link (14) is disposed in the bottom sealing space (1621), inner and outer peripheries of the bottom sealing ring (164) are respectively sealed with the transmission link (14) and the lower limiting cover (162), an outer peripheral edge of the lower limiting cover (162) is bent obliquely upward and then bent obliquely downward to sequentially form a spring limiting portion (1622) and a cover limiting portion (1623), a bottom of the return spring (161) is limited to an inner side of the spring limiting portion (1622), and an outer periphery of the cover limiting portion (1623) is in contact with a side wall of the lower limiting cover (162).