CN108343473B - Dual intake air motor - Google Patents

Abstract

A double-intake air motor comprises a cylinder and a rotor. The cylinder comprises a cylinder body and an elliptical cylindrical chamber located in the cylinder body. The cylinder body is provided with two inlet passages, two exhaust passages, two exhaust holes and a front shaft hole connecting the chamber with the outside. The rotor 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. Thus, the double-intake air motor can reduce the friction force when the rotor rotates, improve the output power of the air motor, and reduce the vibration during use.

Description

Dual intake air motor

technical field

The invention relates to an air motor, in particular to a double air intake air motor.

Background technique

Pneumatic tools refer to a tool that uses compressed air to drive an air motor to output kinetic energy to the outside. The vane type air motor currently used in air tools mainly has a rotor in the center of a cylinder chamber. There are multiple retractable blades. When the high-pressure gas is introduced into the cylinder, these protruding blades can be pushed to drive the rotor to rotate, thereby providing the rotational power required for external work.

At present, the products on the market are mainly single-inlet air motors, but the vibration is relatively large when used. Therefore, the industry has developed a double-inlet air motor in an attempt to improve the vibration problem and increase the output power. For example, the US invention patent US 6250399 is Disclosed is a double-intake air motor. It can be seen from FIG. 9 that the pressure chambers (pressure chambers) 19A, 19B are located on both sides of the rotor (rotor) 50 and are generally in the shape of a meniscus. Due to the shape of the two pressure chambers 19A, 19B Because of the design, when the rotor 50 rotates, the blades (vanes) 54 will rapidly protrude from the radially extending slots 52, maintain the most protruding state for a period of time, and then retract rapidly. Such a stroke The design is used for a long time, the blade 54 will not only be worn by the groove wall of the radial groove 52, but also the rotating speed of the rotor 50 will be reduced due to the friction force on the blade 54, which will affect the output power of the air motor, and even cause damage during use. Vibration problem. Although theoretically the output power of the double-intake air motor should be greater than that of the single-intake air motor, and the vibration should be smaller, but in fact the difference does not seem to be large. Therefore, how to improve the vibration problem of the double-intake air motor and Increasing the output power has become an urgent research and development topic in the industry.

Contents of the invention

In view of the above shortcomings, the purpose of the present invention is to provide a dual air intake air motor, which can reduce the friction force when the rotor rotates, increase the output power of the air motor, and reduce the vibration during use.

In order to achieve the above purpose, the present invention provides a double intake air motor, which includes:

A cylinder, including a cylinder body and an elliptical cylindrical chamber located in the cylinder body, the cylinder body is provided with two inlet passages, two exhaust passages, two exhaust holes, and a front axle hole; and

A rotor comprising a rotor rotatably accommodated in the chamber of the cylinder, a plurality of grooves arranged in parallel to the rotor, a plurality of vanes respectively accommodated in each groove, and a front spindle formed by The swivel extends out and passes through the front axle hole.

The above-mentioned double-intake air motor, wherein the cylinder body includes a middle tube, a front cover is arranged on the front end of the middle tube, and a rear cover is arranged on the rear end of the middle tube, and the front shaft hole is arranged on the front Cover, the two exhaust holes are set on the middle tube, the swivel is attached to the front cover and the rear cover, the rear cover has two air inlets, two exhaust outlets, and two rear air intake guide grooves located on the rear The front wall of the cover is connected to the two air inlets respectively, and two rear exhaust guide grooves are arranged on the front wall of the rear cover and connected to the two air outlets respectively, and the rear end of the middle pipe has two rear air intake grooves The position corresponds to the two air inlets and communicates with the chamber, and the position of the two rear exhaust grooves corresponds to the two air outlets and communicates with the chamber. The rear air intake guide groove and each of the rear air intake grooves are formed, and each of the exhaust passages is respectively composed of each of the exhaust ports, each of the rear exhaust guide grooves, and each of the rear exhaust grooves.

The above-mentioned double-intake air motor, wherein the middle pipe has two intake air passages passing through the middle pipe along an axial direction of the cylinder and respectively connecting the two rear air intake grooves, and two exhaust flow passages along the axial direction. It runs through the middle pipe and is respectively connected to the two rear exhaust grooves, the two front air intake grooves are arranged on the front end of the middle pipe and respectively connected to the two intake runners, and the two front exhaust grooves are arranged on the front end of the middle pipe. The front end is respectively connected to the two exhaust flow channels, the two front air intake grooves and the two front exhaust grooves are all connected to the chamber, the front cover has two front air intake guide grooves arranged on the rear wall of the front cover and It is connected to the air intake channel, and two front exhaust guide grooves are arranged on the rear wall of the front cover and communicated with the exhaust channel. The air intake channel further includes the air intake channel, the front air intake groove and the The front air intake guide groove, the exhaust channel further includes the exhaust runner, the front exhaust groove and the front exhaust guide groove.

In the above-mentioned dual-intake air motor, the front cover and the middle tube are integrally formed.

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

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

When the high-pressure gas is introduced into the cylinder, on the one hand, the vanes can be protruded from the grooves, and on the other hand, the protruding vanes can be pushed to drive the rotor to rotate, because the chamber in the cylinder is an elliptical cylinder shape (that is, the section is elliptical), which can slow down the rapid extension and rapid retraction of these blades, not only can effectively reduce the friction between the blades and the grooves, but also reduce the vibration during use, and at the same time Increase output power.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the perspective view of the double intake type air motor of the first preferred embodiment of the present invention;

Fig. 2 is an exploded view of the double intake air motor of the first preferred embodiment of the present invention;

Figure 3 is a perspective view of the back cover of the first preferred embodiment of the present invention;

4 to 5 are combined perspective views of the middle tube and the rotor in the first preferred embodiment of the present invention;

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

Figure 7 is a perspective view of the front cover of the first preferred embodiment of the present invention;

8 to 10 are schematic diagrams of rotor rotation in the first preferred embodiment of the present invention.

Among them, reference signs

1 dual air intake air motor 40b rear end

2 cylinders 41 intake runners

20 cylinder block 42 rear intake groove

22 chamber 43 exhaust runner

24 Intake channel 44 Rear exhaust groove

26 Exhaust channel 46 Front intake groove

28 Exhaust holes 48 Front exhaust grooves

29 front axle hole 50 front cover

3 rotor 56 front air intake guide slot

30 swivel 58 front exhaust guide slot

32 groove 60 back cover

34 blades 62 air inlets

34a vane 64 exhaust port

34b blade 66 rear air intake guide slot

34c blade 68 rear exhaust guide slot

36 front axle 69 rear axle hole

38 rear spindle X axis

40 in tube C1 chamber

40a front C2 chamber

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

Please refer to Fig. 1 and Fig. 2, the double intake air motor 1 (hereinafter referred to as the motor 1) provided by the first preferred embodiment of the present invention, the motor 1 includes a cylinder 2 and a rotor 3, the motor 1 can be used in Various pneumatic tools, such as pneumatic wrench, pneumatic grinder, pneumatic screwdriver, etc. In the following description of the present invention, it is hereby defined that the right side of the viewing angle in FIGS. 1 and 2 is the rear of the motor 1 , and the left side is the front of the motor 1 .

This cylinder 2 comprises a cylinder block 20, and an elliptical column-shaped chamber 22 is located in the cylinder body 20, that is, the cross section of the chamber 22 is elliptical (can refer to Fig. 6 first), and the cylinder body 20 is set There are two intake passages 24, two exhaust passages 26, four exhaust holes 28, and a front shaft hole 29 connecting the chamber 22 with the outside world. The outside world refers to places other than the motor 1. More specifically, , the cylinder block 20 includes a middle tube 40, a front cover 50 is located at the front end 40a of the middle tube 40, and a rear cover 60 is located at the rear end 40b of the middle tube 40, the front shaft hole 29 is located at the In the front cover 50, the four exhaust holes 28 are respectively arranged on the upper side and the lower side of the middle pipe 40. In other possible embodiments, the number of the exhaust holes 28 only needs to be more than two.

Please refer to FIG. 3 , the rear cover 60 has two air inlets 62 separated by 180°, two exhaust ports 64 separated by 180°, and two rear air intake guide grooves 66 located on the front wall of the rear cover 60 and connected to the two air inlets respectively. The ports 62 are connected, two rear exhaust guide grooves 68 are arranged on the front wall of the rear cover 60 and are respectively connected with the two exhaust ports 64 , and a rear axle hole 69 . In other possible embodiments, the rear cover 60 can be integrally formed with the middle tube 40 .

Please refer to Fig. 4 and Fig. 5, the rear end 40b of the middle pipe 40 has two rear air intake grooves 42 whose positions correspond to the two air inlets 62 and communicate with the chamber 22, and two rear exhaust grooves 44 whose positions correspond to At the two exhaust ports 64 and connected to the chamber 22, the middle pipe 40 further has two intake air passages 41 passing through the middle pipe 40 along an axis X of the cylinder 20 and respectively connecting the two rear air intake grooves 42. Two exhaust channels 43 pass through the middle pipe 40 along the axial direction X and are respectively connected to the two rear exhaust grooves 44, and two front air intake grooves 46 are provided at the front end 40a of the middle pipe 40 and are respectively connected to the Two intake flow passages 41 and two front exhaust grooves 48 are arranged on the front end 40a of the middle pipe 40 and are respectively connected to the two exhaust flow passages 43, the two front air intake grooves 46 and the two front exhaust grooves. 48 are all connected to the chamber 22.

Please refer to FIG. 7 , the front cover 50 has two front air intake guide grooves 56 located on the rear wall of the front cover 50 and communicated with the intake air passage 41 , and two front exhaust guide slots 58 located on the rear wall of the front cover 50 And communicated with the exhaust flow channel 43, each of the air intake channels 24 is composed of the air inlet 62, the rear air intake guide groove 66, the rear air intake groove 42, and the intake air channel 41. , a front air intake groove 46, and a front air intake guide groove 56 are formed, and each exhaust passage 26 is composed of an exhaust port 64, a rear exhaust guide groove 68, a The rear exhaust groove 44 , the exhaust flow channel 43 , the front exhaust groove 48 , and the front exhaust guide groove 58 are formed. In other possible embodiments, the front cover 50 can be integrally formed with the middle tube 40 .

The rotor 3 includes a rotating body 30 rotatably accommodated in the chamber 22 of the cylinder 2, eight grooves 32 parallel to the rotating body 30, and eight blades 34 respectively accommodated in each groove 32, A front spindle 36 extends forward from the swivel 30 and passes through the front axle hole 29, and a rear spindle 38 extends backward from the swivel 30 and extends into the rear axle hole 69. The rotating body 30 is attached to the front cover 50 and the rear cover 60 . In other embodiments, the number of the grooves 32 can be changed as required, and the number of the blades 34 can also be changed corresponding to the grooves 32; the rear shaft hole 69 may not pass through the rear cover 60, the rear The purpose of the spindle 38 extending into the rear axle hole 69 is to connect the swivel body 30 and the rear cover 60 more firmly. In fact, the rear spindle 38 can also be omitted. In this case, The rear axle hole 69 can also be omitted.

When using an air tool with the motor 1 such as an air wrench (not shown), the user can set the air motor to rotate forward or reverse. When high-pressure gas (greater than 1 atmosphere) is introduced into the cylinder 2, the gas will pass through the The second air inlet 24 enters the chamber 22. In more detail, the gas first passes through the two air inlets 62, and then divides into three paths. A part of the gas flows into the chamber through the two rear air inlet grooves 42. 22 (hereinafter collectively referred to as flow direction A), a part of the gas enters the two rear intake guide grooves 66 and then flows into the chamber 22 (hereinafter collectively referred to as flow direction B), and the remaining part of the gas then enters the second air intake channel 41 (hereinafter collectively referred to as flow direction C), when the gas flowing to C passes through the two inlet flow passages 41, it is divided into two channels, and a part of the gas flows into the chamber 22 through the two inlet air grooves 46 (hereinafter collectively referred to as flow direction D), and the remaining A part of the gas enters the two forward air guide grooves 56 and then flows into the chamber 22 (hereinafter collectively referred to as flow direction E); wherein, the gas flowing toward B and toward E enters the chamber 22 and blows the blades 34, These vanes 34 can move outwards from the grooves 32 and stick against the inner wall of the chamber 22. At this time, the gas flowing to A and D will push the protruding vanes 34, and then drive the rotor 3 in the The chamber 22 rotates.

Taking the forward rotation shown in Figure 8 as an example, the chamber 22 sandwiched between one of the blades 34a and the adjacent blade 34b is defined as chamber C1, and the chamber 22 sandwiched between the blade 34b and the adjacent blade 34c 22 is the chamber C2. When the high-pressure gas enters the chamber 22 through the two inlets 24, the vane 34a will first be pushed out from the groove 32 by the gas flowing to B and stick to the chamber 22. At the same time, the vane 34a is blown by the gas flowing through the rear air intake groove 42 (that is, flowing to A) so that the rotor 3 starts to rotate clockwise, and the vane 34b has not yet passed through the exhaust hole 28 , the vane 34c has not reached the rear exhaust groove 44; please refer to Figures 9 and 10, as the rotor 3 rotates, when the vane 34b passes through the exhaust hole 28, the gas in the chamber C1 will It can be exhausted through the exhaust hole 28 for the first exhaust. At this time, the blade 34c just reaches the rear exhaust groove 44, and the gas in the chamber C2 can be discharged through the rear exhaust groove 44 for the second exhaust. Secondary exhaust, and when the blade 34c shrinks, the gas can be squeezed 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 channels 26, wherein the Every time the rotor 3 rotates one revolution, the above steps of air intake and exhaust are cycled twice.

In fact, the detailed process of the gas leaving the chamber 22 through the two exhaust channels 26 is as follows, first part of the gas passes through the exhaust holes 28 for the first exhaust, and then part of the gas directly enters the rear exhaust groove 44 is discharged from the exhaust port 64, part of the gas enters the rear exhaust guide groove 68 and is discharged from the exhaust port 64, and other part of the gas enters through the front exhaust groove 48 and the front exhaust guide groove 58 The exhaust flow channel 43 is discharged through the exhaust port 64 to complete the second exhaust.

It should be noted that when the user sets the pneumatic tool to reverse, the gas can enter the chamber 22 from the outside through the two exhaust passages 26, and can be discharged from the chamber 22 through the two inlet passages 24. To the outside world, that is to say, the functions of the two intake passages 24 and the two exhaust passages 26 can be interchanged according to user requirements.

Since the chamber 22 is in the shape of an ellipse (that is, the cross section is elliptical), when the blades 34 stretch out or retract from the groove 32, the speed is relatively uniform, and when reaching the peak, the speed is relatively high. Uniform retraction, the telescopic stroke of these blades 34 is relatively smooth, and the reciprocating speed is relatively uniform, which is different from that in the existing structure where the blades first stretch out rapidly, then stop suddenly and maintain at the top for a period of time, and then retract rapidly into the groove The strokes are different, and the blades 34 in the existing structure have relatively rapid acceleration and rapid deceleration. In other words, the present invention adjusts the stroke characteristics during the expansion and contraction of the blades or the speed-time curve during the reciprocating movement by changing the shape design of the chamber. Not only makes the movement of the vane 34 itself relatively smooth, but also reduces the friction between the vane 34 and the wall of the groove 32, and further reduces the rotational friction of the rotor 3 to increase the output power of the motor 1. At the same time, each component The smooth interaction between them also reduces the vibration when the motor is running, thus achieving the purpose of the present invention. In addition, due to the improvement of the efficiency of the motor 1, the industry can produce an air motor with the same volume and weight as the existing structure but with a higher output torque, or with the same torque output as the existing structure but with a smaller volume and lighter weight The air motor has great market potential.

In other possible embodiments, the design of the two intake channels 24 and the two exhaust channels 26 can be changed, for example, the two intake channels 24 and the two exhaust channels 26 can be arranged in the middle pipe 40 without passing through the front cover 50 or the rear cover 60, as long as the high-pressure gas can be introduced into the chamber 22 to drive the rotor 3 to rotate, and the gas behind the blades 34 can be discharged from the chamber 22. Another example is that each of the air inlets 24 can only be made up of the air inlet 62, the rear air intake guide groove 66, and the rear air intake groove 42, without including the air intake air passage 41, the The front air intake groove 46 and the front air intake guide slot 56 can also achieve the purpose of driving the air motor to rotate. Or, each of the exhaust passages 26 may only be composed of the exhaust port 64, the rear exhaust guide groove 68, and the rear exhaust groove 44, without including the exhaust flow passage 43, The front exhaust groove 48 and the front exhaust guide groove 58 .

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the appended claims of the present invention.

Claims (5)

1. A double intake air motor, characterized in that it comprises: A cylinder, including a cylinder body and an elliptical cylindrical chamber located in the cylinder body, the cylinder body is provided with two inlet passages, two exhaust passages, two exhaust holes, and a front axle hole; and A rotor comprising a rotor rotatably accommodated in the chamber of the cylinder, a plurality of grooves arranged in parallel to the rotor, a plurality of vanes respectively accommodated in each groove, and a front spindle formed by the swivel extends out and passes through the front axle hole; Wherein, the cylinder block includes a middle pipe, a front cover is arranged on the front end of the middle pipe, and a rear cover is arranged on the rear end of the middle pipe, the front axle hole is arranged on the front cover, and the two exhaust holes are arranged In the middle pipe, the swivel body is attached to the front cover and the rear cover. The rear cover has two air inlets, two exhaust ports, and two rear air intake guide grooves arranged on the front wall of the rear cover and respectively connected to the two The air inlet is connected, and two rear exhaust guide grooves are arranged on the front wall of the rear cover and are respectively connected with the two exhaust ports. The rear end of the middle pipe has two rear air intake grooves whose positions correspond to the two air inlets. and communicate with the chamber, and the positions of the two rear exhaust grooves correspond to the two exhaust ports and communicate with the chamber, each of the air inlets is respectively composed of each of the air inlets, each of the rear air intake guide grooves, and each of the The rear air intake grooves are formed, and each of the exhaust channels is respectively composed of each of the exhaust ports, each of the rear exhaust guide grooves, and each of the rear exhaust grooves. 2. The dual-inlet air motor according to claim 1, wherein the middle pipe has two air intake passages passing through the middle pipe along an axial direction of the cylinder and respectively connecting the two rear air intake grooves 1. Two exhaust flow passages run through the middle pipe along the axial direction and are respectively connected to the two rear exhaust grooves. Exhaust grooves are arranged at the front end of the middle pipe and are respectively connected to the two exhaust flow channels. The two front air intake grooves and the two front exhaust grooves are both connected to the chamber. A guide groove is arranged on the rear wall of the front cover and communicates with the air intake passage, and two front exhaust guide grooves are arranged on the rear wall of the front cover and communicates with the exhaust passage, and the air intake passage further includes the intake air passage channel, the front air intake groove and the front air intake guide groove, and the exhaust channel further includes the exhaust flow channel, the front exhaust groove and the front exhaust guide groove. 3. The dual-inlet air motor according to claim 1 or 2, wherein the front cover and the middle tube are integrally formed. 4. The double-inlet air motor according to claim 1 or 2, wherein the rear cover and the middle tube are integrally formed. 5. The dual air intake air motor according to claim 1, wherein the rotor has a rear spindle extending from the rotating body, and the rear cover has a rear shaft hole for the rear spindle to extend into .