CN108343473B

CN108343473B - Double air inlet type pneumatic motor

Info

Publication number: CN108343473B
Application number: CN201710547151.2A
Authority: CN
Inventors: 吴裕仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-01-24
Filing date: 2017-07-06
Publication date: 2019-12-17
Anticipated expiration: 2037-07-06
Also published as: CN108343473A

Abstract

The utility model provides a two formula pneumatic motor that admit air, contains a cylinder and a rotor, this cylinder contains a cylinder body and a appearance room that is oval cylindricality is located this cylinder body, this cylinder body is equipped with two intake ducts, two exhaust passages, two exhaust holes and a preceding shaft hole that communicate this appearance room and external, this rotor contains a rotor and rotatably holds to establish in the appearance room of this cylinder, this body is located to a plurality of slots parallelly, a plurality of blades hold respectively to establish in each slot, and a preceding mandrel extends and passes this preceding shaft hole by this body of turning. Therefore, the double-air-inlet type pneumatic motor can reduce the friction force when the rotor rotates, improve the output power of the pneumatic motor and reduce the vibration when in use.

Description

Double air inlet type pneumatic motor

Technical Field

The invention relates to a pneumatic motor, in particular to a double-air-inlet type pneumatic motor.

Background

The pneumatic tool is a tool which utilizes compressed air to drive a pneumatic motor to output kinetic energy outwards, and the prior vane type pneumatic motor applied to the pneumatic tool is mainly characterized in that a rotor is pivoted in a cylinder chamber, a plurality of telescopic vanes are arranged on the periphery of a rotor body, and when high-pressure gas is introduced into a cylinder, the extending vanes can be pushed to drive the rotor to rotate, so that the rotary power required by external work is provided.

Currently, the products on the market mainly use single air inlet type pneumatic motors, but the vibration is large when in use, so that a double air inlet type pneumatic motor is developed in the industry, in order to improve the vibration problem and increase the output power, for example, US patent 6250399 discloses a double air inlet type pneumatic motor, as shown in fig. 9, air pressure chambers (19A, 19B) are located at two sides of a rotor (rotor)50 and are generally in a meniscus shape, due to the shape design of the two air pressure chambers 19A,19B, when the rotor 50 rotates, a vane (vane) 54 rapidly extends from a radial extending slot (52) and is rapidly retracted after being approximately maintained in the most extending state for a period of time, such stroke design is used for a long time, the vane 54 is not only worn by the slot wall of the radial slot (52), but also the rotational speed of the rotor 50 is reduced due to the friction force received by the vane 54, thereby affecting the output power of the pneumatic motor, and even cause vibration problems during use. Although the output power of the dual inlet pneumatic motor should be theoretically greater than that of the single inlet pneumatic motor and the vibration should be smaller, the difference seems not to be large in practice, and therefore, how to improve the vibration problem of the dual inlet pneumatic motor and increase the output power becomes a research and development issue in the field.

Disclosure of Invention

In view of the above-mentioned disadvantages, an object of the present invention is to provide a dual intake type air motor capable of reducing friction force when a rotor rotates, increasing output power of the air motor, and reducing vibration during use.

To achieve the above object, the present invention provides a dual air intake type pneumatic motor, comprising:

the cylinder body is provided with two air inlet channels, two air exhaust holes and a front shaft hole, wherein the two air inlet channels, the two air exhaust holes and the front shaft hole are communicated with the accommodating chamber and the outside; and

A rotor, which comprises a rotating body rotatably arranged in the chamber of the cylinder, a plurality of grooves arranged in parallel on the rotating body, a plurality of blades respectively arranged in each groove, and a front spindle extending from the rotating body and passing through the front shaft hole.

the cylinder body comprises a middle tube, a front cover arranged at the front end of the middle tube, and a rear cover arranged at the rear end of the middle tube, the front shaft hole is arranged in the front cover, the two exhaust holes are arranged in the middle tube, the rotating body is abutted against the front cover and the rear cover, the rear cover is provided with two air inlets, two exhaust ports, two rear air guide grooves arranged on the front wall of the rear cover and respectively connected with the two air inlets, and two rear exhaust guide grooves arranged on the front wall of the rear cover and respectively connected with the two exhaust ports, the rear end of the middle tube is provided with two rear air inlet grooves corresponding to the two air inlets and communicated with the containing chamber, and two rear exhaust grooves corresponding to the two exhaust ports and communicated with the containing chamber, each air inlet channel is respectively composed of each air inlet, each rear air guide groove, and each rear air inlet groove, each exhaust channel is respectively composed of each exhaust port, each rear exhaust guide groove, each exhaust channel, And each rear exhaust groove.

in the above-mentioned dual air intake pneumatic motor, the middle tube has two air intake channels passing through the middle tube along an axial direction of the cylinder body and respectively connected to the two rear air intake grooves, two air exhaust channels passing through the middle tube along the axial direction and respectively connected to the two rear air exhaust grooves, two front air intake grooves provided at a front end of the middle tube and respectively connected to the two air intake channels, and two front air exhaust grooves provided at a front end of the middle tube and respectively connected to the two air exhaust channels, the two front air inlet grooves and the two front exhaust grooves are communicated with the containing chamber, the front cover is provided with two front air guide grooves which are arranged on the rear wall of the front cover and communicated with the air inlet flow passage, and two front exhaust guide grooves which are arranged on the rear wall of the front cover and communicated with the exhaust flow passage, the air inlet channel further comprises an air inlet channel, an air inlet groove and an air inlet guide groove, and the air outlet channel further comprises an air exhaust channel, a front air exhaust groove and a front air exhaust guide groove.

in the above-mentioned dual air inlet pneumatic motor, the front cover and the middle tube are integrally formed.

In the above-mentioned dual air inlet pneumatic motor, the rear cover and the middle tube are integrally formed.

In the above-mentioned dual air inlet pneumatic motor, the rotor has a rear spindle extending from the rotating body, and the rear cover has a rear axle hole for the rear spindle to extend into.

When high-pressure gas is introduced into the cylinder, on one hand, the blades can extend out of the grooves, on the other hand, the extended blades can be pushed to drive the rotor to rotate, and because the accommodating chamber in the cylinder body is in an elliptic cylindrical shape (namely, the section is in an elliptic shape), the conditions of rapid extension and rapid retraction of the blades can be relieved, so that the friction force between the blades and the grooves can be effectively reduced, the vibration during use can be reduced, and the output power can be improved.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a perspective view of a dual intake air motor in accordance with a first preferred embodiment of the present invention;

FIG. 2 is an exploded view of a dual inlet air motor according to a first preferred embodiment of the present invention;

FIG. 3 is a perspective view of the rear cover of the first preferred embodiment of the present invention;

FIGS. 4 to 5 are perspective views illustrating the combination of the middle tube and the rotor according to the first preferred embodiment of the present invention;

FIG. 6 is a front view of the middle tube of the first preferred embodiment of the present invention;

FIG. 7 is a perspective view of a front cover according to a first preferred embodiment of the present invention;

Fig. 8 to 10 are schematic views illustrating the rotation of the rotor according to the first preferred embodiment of the present invention.

wherein the reference numerals

1 rear end of double air inlet type pneumatic motor 40b

2-cylinder 41 intake runner

20 cylinder 42 rear air inlet groove

22 chamber 43 exhaust channel

24 inlet duct 44 rear exhaust groove

26 exhaust passage 46 front air inlet groove

28 exhaust hole 48 front exhaust groove

29 front axle hole 50 front cover

3 rotor 56 front air guide groove

Front exhaust guide groove of 30-rotor 58

32 groove 60 back cover

34 vanes 62 air inlet

34a vane 64 exhaust port

34b rear air guide groove of vane 66

34c vane 68 rear exhaust duct

36 front spindle 69 rear spindle hole

38 rear spindle X axial direction

40 pipe C1 chamber

40a front end C2 chamber

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

Referring to fig. 1 and 2, a first preferred embodiment of the present invention provides a dual air intake type pneumatic motor 1 (hereinafter referred to as a motor 1), the motor 1 includes an air cylinder 2 and a rotor 3, and the motor 1 can be applied to various pneumatic tools, such as a pneumatic wrench, a pneumatic grinder, a pneumatic screwdriver, etc. In the following description, it is defined that the right side of the views of fig. 1 and 2 is the rear side of the motor 1, and the left side is the front side of the motor 1.

The cylinder 2 includes a cylinder body 20, and an elliptic cylindrical accommodation chamber 22 located in the cylinder body 20, that is, the cross section of the accommodation chamber 22 is elliptic (refer to fig. 6), the cylinder body 20 is provided with two air inlets 24, two air outlets 26, four air vents 28, and a front shaft hole 29 for communicating the accommodation chamber 22 with the outside, which is a place outside the motor 1, more specifically, the cylinder body 20 includes a middle tube 40, a front cover 50 located at a front end 40a of the middle tube 40, and a rear cover 60 located at a rear end 40b of the middle tube 40, the front shaft hole 29 is located at the front cover 50, the four air vents 28 are respectively located at an upper side and a lower side of the middle tube 40, and in other possible embodiments, the number of the air vents 28 is only two or more.

Referring to fig. 3, the rear cover 60 has two air inlets 62 spaced apart by 180 °, two air outlets 64 spaced apart by 180 °, two rear air inlet guide slots 66 disposed on the front wall of the rear cover 60 and respectively connected to the two air inlets 62, two rear air outlet guide slots 68 disposed on the front wall of the rear cover 60 and respectively connected to the two air outlets 64, and a rear shaft hole 69. In other possible embodiments, the rear cover 60 may be integrally formed with the middle tube 40.

Referring to fig. 4 and 5, the rear end 40b of the middle tube 40 has two rear air inlet grooves 42 corresponding to the two air inlets 62 and communicating with the chamber 22, and two rear exhaust grooves 44 corresponding to the two exhaust ports 64 and communicating with the chamber 22, the middle tube 40 further has two air inlet channels 41 penetrating through the middle tube 40 along an axial direction X of the cylinder 20 and respectively connected to the two rear air inlet grooves 42, two exhaust channels 43 penetrating through the middle tube 40 along the axial direction X and respectively connected to the two rear exhaust grooves 44, two front air inlet grooves 46 provided at the front end 40a of the middle tube 40 and respectively connected to the two air inlet channels 41, and two front exhaust grooves 48 provided at the front end 40a of the middle tube 40 and respectively connected to the two exhaust channels 43, the two front air inlet grooves 46 and the two front exhaust grooves 48 both communicating with the chamber 22.

Referring to fig. 7, the front cover 50 has two front air inlet guide slots 56 disposed on the rear wall of the front cover 50 and communicated with the air inlet channel 41, and two front air outlet guide slots 58 disposed on the rear wall of the front cover 50 and communicated with the air outlet channel 43, each air inlet channel 24 is composed of an air inlet 62, a rear air inlet guide slot 66, a rear air outlet slot 42, an air inlet channel 41, a front air outlet slot 46, and a front air outlet guide slot 56, and each air outlet channel 26 is composed of an air outlet 64, a rear air outlet guide slot 68, a rear air outlet slot 44, an air outlet channel 43, a front air outlet slot 48, and a front air outlet guide slot 58. In other possible embodiments, the front cover 50 may be integrally formed with the middle tube 40.

The rotor 3 includes a rotating body 30 rotatably received in the receiving chamber 22 of the cylinder 2, eight grooves 32 parallelly received in the rotating body 30, eight blades 34 received in each groove 32, a front spindle 36 extending forward from the rotating body 30 and passing through the front spindle hole 29, and a rear spindle 38 extending rearward from the rotating body 30 and extending into the rear spindle hole 69, the rotating body 30 abutting against the front cover 50 and the rear cover 60. In other embodiments, the number of the grooves 32 may vary according to requirements, and the number of the blades 34 may also vary corresponding to the grooves 32; the rear axle hole 69 may not extend through the rear cover 60, and the rear axle 38 may extend into the rear axle hole 69 for the purpose of more firmly connecting the rotator 30 and the rear cover 60, and in fact, the rear axle 38 may be omitted, in which case, the rear axle hole 69 may also be omitted.

When a pneumatic tool such as a pneumatic wrench (not shown) having the motor 1 is used, a user may set the pneumatic motor to rotate forward or backward, when high-pressure gas (greater than 1 atmosphere) is introduced into the cylinder 2, the gas enters the chamber 22 through the two inlet channels 24, more specifically, the gas passes through the two inlet ports 62 and then is divided into three paths, a portion of the gas flows into the chamber 22 through the two rear inlet grooves 42 (hereinafter, referred to as flow direction a), a portion of the gas enters the two rear inlet guide grooves 66 and then flows into the chamber 22 (hereinafter, referred to as flow direction B), the remaining portion of the gas flows into the two inlet channels 41 (hereinafter, referred to as flow direction C), and the gas flowing to C passes through the two inlet channels 41 and then is divided into two paths, and a portion of the gas flows into the chamber 22 through the two front inlet grooves 46 (hereinafter, referred to as flow direction D), A part of the remaining gas enters the two front gas inlet channels 56 and then flows into the chamber 22 (hereinafter, referred to as flow direction E); after entering the chamber 22, the gas flowing in the direction B and the gas flowing in the direction E blow the blades 34, so that the blades 34 can move outwards from the grooves 32 and abut against the inner wall of the chamber 22, and at this time, the gas flowing in the direction a and the gas flowing in the direction D push the extended blades 34, thereby driving the rotor 3 to rotate in the chamber 22.

Taking the forward rotation shown in fig. 8 as an example, defining the chamber 22 sandwiched between one blade 34a and the adjacent blade 34B as a chamber C1, and the chamber 22 sandwiched between the blade 34B and the adjacent blade 34C as a chamber C2, when the high-pressure gas enters the chamber 22 through the two inlet channels 24, the blade 34a is firstly pushed out of the groove 32 by the gas flowing to B and abuts against the inner wall of the chamber 22, and meanwhile, the blade 34a is blown by the gas flowing through the rear air inlet groove 42 (i.e., flowing to a) so that the rotor 3 starts to rotate clockwise, at this time, the blade 34B does not pass through the air outlet hole 28, and the blade 34C does not reach the rear air outlet groove 44; referring to fig. 9 and 10, as the rotor 3 rotates, after the blade 34b passes through the exhaust hole 28, the gas in the chamber C1 can be exhausted through the exhaust hole 28 for the first exhaust, at this time, the blade 34C reaches the rear exhaust groove 44, the gas in the chamber C2 can be exhausted through the rear exhaust groove 44 for the second exhaust, and the blade 34C retracts to push the gas into the rear exhaust guide groove 68 from the groove 32, in other words, the gas can leave the chamber 22 through the two exhaust passages 26, wherein the intake and exhaust steps are performed twice for each rotation of the rotor 3.

In fact, the detailed flow of the gas exiting the chamber 22 through the two exhaust channels 26 is as follows, first, a portion of the gas is first exhausted through the exhaust holes 28, then a portion of the gas directly enters the rear exhaust groove 44 and is exhausted through the exhaust port 64, a portion of the gas enters the rear exhaust guide groove 68 and is exhausted through the exhaust port 64, and the other portion of the gas enters the exhaust channel 43 through the front exhaust groove 48 and the front exhaust guide groove 58 and is exhausted through the exhaust port 64, thereby completing the second exhaust.

It should be noted that when the user sets the pneumatic tool to reverse, the air can enter the chamber 22 from the outside through the two exhaust channels 26 and can be exhausted from the chamber 22 to the outside through the two inlet channels 24, that is, the functions of the two inlet channels 24 and the two exhaust channels 26 can be interchanged according to the user's requirement.

Because the chamber 22 is in an elliptic cylinder shape (i.e. the cross section is in an elliptic shape), when the vanes 34 extend or retract from the groove 32, the speed is relatively uniformly extended, and when the vanes reach the top, the speed is relatively uniformly retracted, the extending and retracting stroke of the vanes 34 is smooth, the reciprocating speed is relatively uniform, and different from the stroke of the conventional structure in which the vanes rapidly extend and rapidly stop, and are approximately maintained at the top for a period of time, and then rapidly retract into the groove, the vanes 34 in the conventional structure are relatively rapidly accelerated and rapidly decelerated, in other words, by changing the shape design of the chamber, the stroke characteristic when the vanes extend and retract or the speed-time curve when the vanes move back and forth is adjusted, so that the movement of the vanes 34 is smooth, the friction between the vanes 34 and the wall surface of the groove 32 can be reduced, and the rotational friction of the rotor 3 can be further reduced, the output power of the motor 1 is increased, and the smooth interaction among the elements also reduces the vibration of the motor during operation, thereby achieving the purpose of the invention. In addition, due to the improvement of the efficiency of the motor 1, manufacturers can manufacture a pneumatic motor with the same volume and weight as the existing structure but with a larger output torque, or a pneumatic motor with the same torque output as the existing structure but with a smaller volume and a lighter weight, which has great market potential.

In other possible embodiments, the design of the two inlet ducts 24 and the two outlet ducts 26 may be varied, for example, the two inlet ducts 24 and the two outlet ducts 26 may be disposed on the peripheral wall of the middle tube 40 without passing through the front cover 50 or the rear cover 60, as long as high-pressure gas can be introduced into the chamber 22 to push the rotor 3 to rotate and the gas pushing the blades 34 can be exhausted from the chamber 22. Also, if each air inlet channel 24 is composed of only one air inlet 62, one rear air guiding groove 66 and one rear air guiding groove 42, but does not include the air inlet channel 41, the front air guiding groove 46 and the front air guiding groove 56, the purpose of driving the air motor to rotate can be achieved. Alternatively, each exhaust passage 26 may be composed of only one exhaust port 64, one rear exhaust channel 68, and one rear exhaust groove 44, without including the exhaust channel 43, the front exhaust groove 48, and the front exhaust channel 58.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A dual intake air pneumatic motor, comprising:

A rotor, which comprises a rotating body rotatably accommodated in the accommodating chamber of the cylinder, a plurality of grooves arranged in parallel on the rotating body, a plurality of blades respectively accommodated in each groove, and a front spindle extending from the rotating body and penetrating through the front shaft hole;

wherein the cylinder body comprises a middle pipe, a front cover arranged at the front end of the middle pipe, and a rear cover arranged at the rear end of the middle pipe, the front axle hole is arranged on the front cover, the two exhaust holes are arranged on the middle tube, the rotating body is abutted against the front cover and the rear cover, the rear cover is provided with two air inlets, two air outlets, two rear air inlet guide grooves which are arranged on the front wall of the rear cover and are respectively connected with the two air inlets, and two rear air outlet guide grooves which are arranged on the front wall of the rear cover and are respectively connected with the two air outlets, the rear end of the middle pipe is provided with two rear air inlet grooves which correspond to the two air inlets and are communicated with the containing chamber, and two rear exhaust grooves which correspond to the two air outlets and are communicated with the containing chamber, each air inlet channel is respectively composed of each air inlet, each rear air inlet guide groove and each rear air inlet groove, and each exhaust channel is respectively composed of each air outlet, each rear exhaust guide groove and each rear exhaust groove.

2. the dual intake type pneumatic motor as claimed in claim 1, wherein the middle tube has two intake channels passing through the middle tube in an axial direction of the cylinder and respectively connected to the two rear intake grooves, two exhaust channels passing through the middle tube in the axial direction and respectively connected to the two rear exhaust grooves, two front intake grooves formed at a front end of the middle tube and respectively connected to the two intake channels, and two front exhaust grooves formed at a front end of the middle tube and respectively connected to the two exhaust channels, the two front intake grooves and the two front exhaust grooves both communicating with the chamber, the front cover having two front exhaust guide grooves formed at a rear wall of the front cover and communicating with the intake channels, and two front exhaust guide grooves formed at a rear wall of the front cover and communicating with the exhaust channels, the intake channels further comprising the intake channels, the front exhaust grooves and the front exhaust channels, the exhaust channels further comprising the exhaust channels, the exhaust channels, The front exhaust groove and the front exhaust guide groove.

3. The dual intake air motor of claim 1 or 2, wherein the front cover is integrally formed with the center tube.

4. The dual intake air motor of claim 1 or 2, wherein the rear cover is integrally formed with the center tube.

5. The dual intake air motor of claim 1, wherein the rotor has a rear spindle extending from the rotor, and the rear cover has a rear shaft hole into which the rear spindle extends.