CN2351420Y

CN2351420Y - Pneumatic screwdriver

Info

Publication number: CN2351420Y
Application number: CN 98251823
Authority: CN
Inventors: 许琇琳
Original assignee: MIJY-LAND INDUSTRIAL Co Ltd
Current assignee: MIJY-LAND INDUSTRIAL Co Ltd
Priority date: 1998-12-28
Filing date: 1998-12-28
Publication date: 1999-12-01
Anticipated expiration: 2008-12-28

Abstract

The utility model relates to a pneumatic screwdriver. A screwdriver set, a clutch set, a gear set and a motor set are arranged in a casing. A converting switch which can move in left and right, and control the pneumatic motor to rotate in a positive direction and a reverse direction is arranged on the casing. The surface of the casing surrounds with a plurality of grooves for slide prevention. The motor set is provided with a pneumatic motor. A plurality of pressure reducing zones are arranged between a cylinder and a rotor of the pneumatic motor, wherein two air exhaust holes are respectively arranged in two opposite pressure reducing zones which are close to the thinnest part of the cylinder wall. The positive rotation and the reverse rotation of the pneumatic motor are controlled by regulating the left displacement and the right displacement of the converting switch, and the relative air exhaust holes can be opened or masked; thus, the pneumatic motor can not generate the return pressure in the running process.

Description

Pneumatic screw driver

The utility model relates to a kind of Pneumatic screw driver, refers to a kind of Pneumatic screw driver short, little, light, that province's energy also can promote the air motor Practical Benefit effectively that has especially.

General existing Pneumatic screw driver all has air motor at interior arrangement, and as shown in Figure 1 and Figure 2, this air motor mainly utilizes high pressure air by import P ₁Enter,, be converted into the low-pressure air of a kind of assembly of continuous rotation after causing high pressure air to expand continuously, again from outlet P through parts such as cylinders, rotor, blade ₂And P ₃The place discharges.

So, as shown in Figure 1, when high pressure air when admission port enters nozzle and cylinder, density and air pressure maximum at regional A-A, but the sectional area minimum, the inertia that must flow toward low pressure according to mass conservation principle and high pressure, and by Bernoulli Jacob's gas continuity equation: P ₁ρ ₁A ₁=P ₂ρ ₂A ₂, mass flow rate G just ₁=mass flow rate G ₂(density of air and loss due to friction in the following formula are ignored).And work as air by import P ₁When entering regional A-A, B-B, by as can be known graphic, sectional area A ₂Become big gradually,, learnt air pressure P according to aforesaid equation because the quality of air flows does not subtract ₂Must diminish, may reach balance.Change speech, the sectional area of zone A-A, B-B, the C-C depressor area one by one of can saying so, and the rotor that is made air motor in view of the above produces inertia and rotates, when air reduces pressure and makes relative volume then become big along with the rotation of rotor always always, as the blade rotation of motor vertex (outlet P to depressor area ₂) time, the decompression action is promptly accused and is finished, and therefore, used low-pressure air is also discharged thus, but region D-D and E-E depressor area are still arranged in cylinder, so at outlet P ₃Still be provided with exhausr port, can allow and discharge smoothly with the low-pressure air of crossing.In like manner, as shown in Figure 1, when motor reversed, high pressure air was then from import P ₁Enter nozzle, through the sectional area of area E-E and D-D, again via outlet P ₂And P ₃Discharge.

Torsion and rotating speed when making the motor forward and backward are identical, so the essential design of primary air vents is at outlet P ₂On, the sectional area of region D-D is produced with calming the anger body (during counter-rotating, then at the sectional area place of zone C-C), so by the sectional area of region D-D as can be known shown in Figure 1 by greatly slowly dwindling, so air pressure must rise and produce cut-back pressure, moyor must reduce (this point also can be demonstrate,proved by aforesaid Bernoulli Jacob's gas mode know), and torque value and rotating speed are also inaccurate.

And having had the Pneumatic screw driver that can solve above-mentioned difficulties at present on the market, it adopts a kind of mode that directly cylinder volume is strengthened, to increase the torsion of motor; But just can increase the volume and the weight of whole Pneumatic screw driver thus, relative energy resource consumption also can increase, and simultaneously, except being unfavorable for gripping in the use, does not also meet short, little, light, as to economize energy product new trend.

Main purpose of the present utility model is to provide a kind of Pneumatic screw driver, and it is short, little, light and economize the energy, and adopts simple in structure and accurate torsion to adjust design outward, makes integral body more meet the human engineering design.

The purpose of this utility model is to realize like this, a kind of Pneumatic screw driver promptly is provided, have a shell, from bottom to top be provided with the clutch pack that a bottle opener group that the build-in screwdriver head is provided, a predeterminable torque value and escape control motor stop in it in regular turn, the gear cluster and of a transmission power provides the groups of motors in major impetus source; Wherein said motor has cylinder and is provided with an eccentric emptying aperture, and it is interior and be provided with rotor, and rotor peripheries is equipped with several equidistant blades, and the space between cylinder and the rotor is separated into several depressor areas; Described case surface place near to the upper end is provided with the change-over switch that is left and right displacement of a may command air motor forward and backward, and in the relative depressor area of the cylinder wall thinnest part of nearly air motor, respectively being provided with several deflation holes, the deflation holes in two depressor areas are switched switch simultaneously and control.

The advantage of the utility model device is, can make air motor in operation process, can not produce the situation of back pressure, and can improve the accurate torsion of air motor, and also has integrated anti-skidding design in shape, in addition, the soft outer shell base of the replaceable casing of bottle opener, front end then can install anti-skidding protecting cover etc. additional, can increase the utilization benefit of overall utility and diversification, to reach the effect that meets human engineering.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

Fig. 1 is the just commentaries on classics state of Pneumatic screw driver for the section action scheme drawing one of existing air motor.

Fig. 2 is the anti-state of Pneumatic screw driver for the section action scheme drawing two of existing air motor.

Fig. 3 is the whole section-drawing of the utility model Pneumatic screw driver.

Fig. 4 is the sectional schematic diagram one of air motor of the present utility model.

Fig. 5 is the sectional schematic diagram two of air motor of the present utility model.

Fig. 6 is the action scheme drawing one of the utility model Pneumatic screw driver.

Fig. 7 is the action scheme drawing two of the utility model Pneumatic screw driver.

Fig. 8 is the action scheme drawing three of the utility model Pneumatic screw driver.

Fig. 9 is the action scheme drawing four of the utility model Pneumatic screw driver.

Figure 10 is the action scheme drawing five of the utility model Pneumatic screw driver.

Figure 11 is the action scheme drawing six of the utility model Pneumatic screw driver.

Please refer to the utility model Pneumatic screw driver shown in Fig. 3,4,5, it mainly has the essential structure of general bottle opener, includes a shell 1 substantially, and in be provided with bottle opener group 2, clutch pack 3, gear cluster 4 and groups of motors 5; Wherein be provided with one and switch switch 10, and be equipped with several groove (not shown), to form anti-skidding effect in the middle section in appropriate location, shell 1 nearly upper end.This groove also can provide being embedded of a soft outer shell base 12; And bottle opener group 2 includes driver base 20, steel ball 21, axle sleeve 22, mainly is embedded for screwdriver head 23; Clutch pack 3 is located at bottle opener group 2 tops, further comprises upper and lower power-

transfer clutch

30,31, adapter shaft 32, torque spring 33 and hits cover members such as 34, sets with the torque value that bottle opener is provided, and stops by the escape control bottle opener motor of upper and lower power-transfer clutch 30; Gear cluster 4 is made of gear cylinder 40, inner gear sleeve 41, fluted disc 42 and gear 43, and its purpose is to make the kinetic force of groups of motors 5 to transfer to the bottle opener group 2 of below, has the effect of transmission power; Groups of motors 5 then is made up of an air motor 50 and a back shell block 51 haply, wherein, air motor 50 has a cylinder 52, this cylinder 52 is provided with the accentric perforation, and on thicker cylinder wall, be provided with the equity two nozzles 53, be provided with rotor 54 in the above-mentioned perforation, simultaneously, equidistantly be provided with several blades 55 at rotor 54 peripheries, so that the space between rotor 54 and the cylinder 52 is separated into A-A, B-B, C-C, D-D, five depressor areas 56 such as E-E, and provide the air motor 50 of high efficiency and accurate torsion to construct by this, because the thin portion of each part mentioned above member is all little with existing Pneumatic screw driver difference, and the also non-emphasis of the present utility model of these structures place is so no longer add to give unnecessary details.

Please in the lump with reference to shown in Fig. 4,5, principal character of the present utility model is: each design of the sectional area place of D-D in air motor 50 and C-C depressor area 56 has two deflation holes 57, and when making forward and backward and switch, can open or close the deflation hole 57 of this D-D and C-C depressor area 56 simultaneously by the change-over switch 10 that starts Pneumatic screw driver.Please cooperate again and consult shown in Fig. 6 to 8, when air motor 50 is just changeing, high pressure air enters from import P1, and along B-B, C-C depressor area 56 and successfully for the first time low-pressure air discharge by two deflation holes 57 of D-D depressor area 56, and low-pressure air also can be discharged from outlet P3 for the second time, thus, just has more two depressor areas 56 of D-D, E-E, the efficient of air motor 50 do not produce and do not have the back pressure situation, so can improve 20～30%; Please cooperate again and consult shown in Fig. 9 to 11, in like manner, when adjusting change-over switch 10, the user makes motor when counter-rotating, just simultaneously open position in two deflation holes 57 of C-C depressor area 56, high pressure gas are entered from E-E depressor area 56, along D-D, C-C depressor area 56 and for the first time low-pressure air is discharged, and by the B-B depressor area 56 places discharge low-pressure air second time, but in above-mentioned air motor 50 Umklapp processes, must simultaneously two deflation holes 57 of D-D depressor area 56 be closed, high pressure air just is not discharged from when expanding as yet.So the motor that can the make the utility model Pneumatic screw driver no matter efficient under the forward and backward state all can improve 20～30%.

In addition, integrated shell 1 surface of the utility model Pneumatic screw driver is equipped with several groove longitudinally, and has anti-skidding effectiveness and have aesthetic property concurrently; Simultaneously, this groove also can provide soft outer shell base 12 a build-ins location, and the gripping of user's hand when operation is easy, and has commutativity concurrently.

Claims

1. Pneumatic screw driver, have a shell, from bottom to top be provided with the clutch pack that a bottle opener group that the build-in screwdriver head is provided, a predeterminable torque value and escape control motor stop in it in regular turn, the gear cluster and of a transmission power provides the groups of motors in major impetus source; Wherein said motor has cylinder and is provided with an eccentric emptying aperture, and it is interior and be provided with rotor, and rotor peripheries is equipped with several equidistant blades, and the space between cylinder and the rotor is separated into several depressor areas; It is characterized in that, described case surface place near to the upper end is provided with the change-over switch that is left and right displacement of a may command air motor forward and backward, and in the relative depressor area of the cylinder wall thinnest part of nearly air motor, respectively being provided with several deflation holes, the deflation holes in two depressor areas are switched switch simultaneously and control.

2. Pneumatic screw driver as claimed in claim 1 is characterized in that described air motor is provided with cooresponding nozzle in the thickness of cylinder wall.

3. Pneumatic screw driver as claimed in claim 1 is characterized in that, the middle section surface periphery of described shell is equipped with several and has anti-skidding design-calculated groove, build-in one soft outer shell base in the described groove.