CN2470569Y

CN2470569Y - Pneumatic hydraulic pump

Info

Publication number: CN2470569Y
Application number: CN 01205383
Authority: CN
Inventors: 唐坤瑞; 方福根; 徐勤业
Original assignee: DADA MACHINERY (HANGZHOU) PLANT Co Ltd
Current assignee: Ta Ta Technology (Ningguo) Co., Ltd.
Priority date: 2001-02-16
Filing date: 2001-02-16
Publication date: 2002-01-09
Anticipated expiration: 2011-02-16

Abstract

The utility model relates to a pneumatic hydraulic pump which comprises a cylinder, a piston, a piston rod and a spring for providing recovery force to the piston. The cylinder consists of a front end encloser, a back end encloser and a cylinder barrel. The utility model is characterized in that an air inlet threaded sleeve and an air inlet control valve are arranged on the front end encloser of the cylinder; an oil-pressure sprue and an oil inlet passage, an oil return nozzle and an oil return passage are arranged on the back end encloser of the cylinder; an air escape groove is opened on the inner wall of the cylinder barrel. The pneumatic hydraulic pump not only relieves hands and feet from work but also can be used in some places with worse working conditions; and the adoption of a muffler arranged in front of an air outlet helps reduce noises largely.

Description

A kind of air-driven hydraulic pump

The utility model relates to a kind of oil hydraulic pump, and relating in particular to a kind ofly increases the pump of oil pressure, appellation air-driven hydraulic pump with pressurized air as power source.

The power source commonly used of oil pressure pump has electronic and manpower (foot-operated or manual) at present, and comparatively rare as the oil pressure pump of power source with pressurized air, especially is used on the small-sized equipment (as jack) more rare.Even if having, the noise of its generation is very big according to reports, and practicability is very poor.Be used for the oil pressure pump on the mini-plants such as jack at present, its power generally all is manpower.The utility model purpose is exactly to make the oil pump supercharging with pressurized air as the manual labor that power source replaces trick, and takes measures to overcome the big drawback of noise technically.

For realizing above-mentioned model utility purpose, the utility model has adopted following technological scheme: air-driven hydraulic pump provides the spring of restoring force to be made up of cylinder, piston, piston rod and one to piston, cylinder by front cover, rear end cover, and cylinder barrel constitute, the front cover that is characterized in cylinder is provided with an air inlet Luo cover and an air intake control valve, air inlet Luo puts and has the vertical air inlet hole and be connected with the bottom of air intake control valve, the other end that air inlet Luo puts is provided with one in order to reduce the buffer of selector valve column impact power, and it is made up of buffer bar, cushion plugs and seal ring; The rear end cover of cylinder is provided with an oil pressure purt and chews with oil-feed oil circuit and an oil return and chew and oil return circuit; Cylinder barrel is provided with the air pressure check valve, has disappointing groove on the inwall of cylinder barrel; Piston is made up of gas piston, oily piston and selector valve, the gas piston links to each other by screw with oily piston, the phase scarf has a selector valve between gas piston and oily piston, this selector valve is made up of commutation valve rod, commutation valve plug and seal ring, the commutation valve rod is provided with the gap with cooperating of piston, the gas piston is provided with vent and bleeder port, is filled with the baffler made from fabric at the end of bleeder port;

Be provided with a needle in the middle of the valve body of described air intake control valve, non-return pad is passed in the lower end of needle and Returnning spring joins, and communicates with suction port, is provided with seal ring between needle and the valve body, and the other end of needle is emerging in outside the pump housing;

The stage casing diameter of described gas outside piston is inlaid with a seal ring less than the external diameter of piston respectively at the two ends of this piston;

Described piston rod, one end are made the concave spherical surface engagement of hemisphere and oily piston central authorities.

Above-mentioned air-driven hydraulic pump, as long as the place of air compressor source of the gas is arranged can be used, not only liberated the work of hand or pin, and can use in the relatively poor place of some working environment, liftoff shorter as the position that jack will push up through being everlasting, trick all is difficult to stretch the place that obtains, and at this moment only needs to follow pump to be dragged into compressed air hose and can make the jack proper functioning.Above-mentioned air-driven hydraulic pump is again because an end of its piston rod is made hemisphere is meshed with the concave spherical surface of oily piston central authorities, this structural design can guarantee the precision that the piston rod level is twitched, improved the functional reliability of oil hydraulic pump greatly, relatively reduced simultaneously the processing of parts in addition and the requirement of assembling, changed sentence and live to say it promptly is to have reduced cost.In addition because adopted silencing apparatus in the place ahead of relief opening, taked the measure of buffering damping at an end of selector valve, noise is reduced greatly.This just makes the present invention go on the practical stage.

Below in conjunction with embodiment and accompanying drawing the utility model is described in detail:

Longitudinal sectional view when Fig. 1 is the initial working state of air-driven hydraulic pump;

Longitudinal sectional view when Fig. 2 is the air-driven hydraulic pump terminal operating status;

As shown in Figure 1 and Figure 2: air-driven hydraulic pump provides the spring 26 of restoring force to be made up of cylinder, piston, piston rod 28 and one to piston, cylinder by front cover 12, rear end cover 31, and cylinder barrel 4 constitute, the front cover of cylinder is provided with air inlet Luo cover 13 and one air intake control valve 8, have the vertical air inlet hole on the air inlet Luo cover 13 and be connected with the bottom of air intake control valve, the other end that air inlet Luo puts is provided with a buffer in order to valve rod 18 impact forces that reduce to commutate, and it is made up of buffer bar 17, cushion plugs 15 and seal ring 16; The rear end cover of cylinder be provided with an oil pressure purt chew 27 and oil-feed oil circuit 29 and oil return chew 2 and oil return circuit 32; Cylinder barrel 4 is provided with air pressure check valve 3, has the groove 6 that loses heart on the inwall of cylinder barrel; Piston is made up of gas piston 23, oily piston 25 and selector valve, the gas piston links to each other by screw 33 with oily piston, the phase scarf has a selector valve between gas piston and oily piston, this selector valve is made up of commutation valve rod 18, commutation valve plug 20 and seal ring 21, the commutation valve rod is provided with the gap with cooperating of piston, the gas piston is provided with vent 5 and bleeder port 19, is filled with the baffler made from fabric 24 at the end of bleeder port; Be provided with a needle 7 in the middle of the valve body 8 of described air intake control valve, the lower end of needle is passed non-return pad 10 and is joined with Returnning spring 11, and communicates with suction port 14, is provided with seal ring 9 between needle 7 and the valve body 8, and the other end of needle is emerging in outside the pump housing; The stage casing diameter of described gas piston 23 cylindricals is inlaid with a seal ring 22 less than the external diameter of piston respectively at the two ends of this piston; Described piston rod 28, one end are made the concave spherical surface engagement of hemisphere and oily piston 25 central authorities

As can be known from Fig. 1 when the A place to pedal 1 applies a power, the needle 7 of air intake control valve 8 produces displacement downwards, and needle termination and non-return pad 10 are thrown off, and pressurized air is introduced into through air outlet hole 34 and enters air chamber a, promote piston to moving to left, make that the oil pressure in the b of grease chamber raises.When piston is pulled to as shown in Figure 2 the position, the effect of groove 6 owing to lose heart on cylinder barrel 4 inwalls, gas is introduced into vent 5 and enters air chamber c and promote selector valve and move right, its result makes the indoor pressurized air of a flow into bleeder port 19 through gap M and N, discharges through silencing apparatus 24 and check valve 3 again.The same barometric pressure of air chamber a internal air pressure this moment.Under the effect of Returnning spring 26, make piston begin to move right, till the buffer bar 17 of commutation valve rod 18 and buffer withstands.This moment, gap M was closed.So air intake control valve is opened the work of lifting again, a new circulation begins again.The to-and-fro motion that goes round and begins again constantly raises oil pressure.Guarantee that a end that the quick to-and-fro motion of piston rod has benefited from its piston rod 28 makes hemisphere and be meshed with the concave spherical surface of oily piston 25 central authorities, this structural design can guarantee piston rod 28 automatic centering, steady precision of twitching in to-and-fro motion, has improved the functional reliability of oil hydraulic pump greatly.The B end that when finishing a task, only needs at pedal 1 applies a power, just can make oil return chew 2 and open, and high pressure oil flow back into oil tank 35 through oil return circuit 32.

Claims

1, a kind of air-driven hydraulic pump is by cylinder, piston, piston rod (28) and spring (26) composition that restoring force is provided to piston, cylinder is by front cover (12), rear end cover (31), and cylinder barrel (4) constitutes, it is characterized in that: the front cover of cylinder (12) is provided with air inlet Luo cover (13) and an air intake control valve (8), have inlet hole on the air inlet Luo cover (13) and be connected with the bottom of air intake control valve (8), the other end on the air inlet Luo cover (13) is provided with a buffer in order to valve rod (18) impact force that reduces to commutate, it is by buffer bar (17), cushion plugs (15) and seal ring (16) are formed, and it and air inlet Luo cover (13) are assemblied in front cover (12) central authorities together; The rear end cover of cylinder (31) is provided with an oil pressure purt and chews (27) and oil-feed oil circuit (29) and an oil return and chew (2) and oil return circuit (32), and the oil pressure purt is chewed to chew by Luo line and rear end cover (31) with oil return and is tightly connected; Cylinder barrel (4) is provided with air pressure check valve (3), is tightly connected with cylinder barrel (4) Luo line, has disappointing groove (6) on the inwall of cylinder barrel (4); Piston is made up of gas piston (23), oily piston (25) and selector valve, gas piston (23) links to each other by screw (33) with oily piston (25), the phase scarf has a selector valve between gas piston and oily piston, this selector valve is made up of commutation valve rod (18), commutation valve plug (20) and seal ring (21), commutation valve rod (18) is provided with gap N with cooperating of gas piston (23), the gas piston is provided with vent (5) and bleeder port (19), is filled with the baffler made from fabric (24) at the end of bleeder port (19); One end of piston rod (28) is made hemisphere and is meshed with the concave spherical surface of oily piston (25) central authorities.

2, air-driven hydraulic pump according to claim 1, it is characterized in that: be provided with a needle (7) in the middle of the valve body of described air intake control valve (8), the lower end of needle is passed non-return pad (10) and is joined with Returnning spring (11), and communicate with suction port (14), be provided with seal ring (9) between needle (7) and the valve body (8), the other end of needle is emerging in outside the pump housing.

3, air-driven hydraulic pump according to claim 1 is characterized in that: the stage casing diameter d of described gas piston (23) cylindrical is inlaid with a seal ring (22) less than the outer diameter D of piston respectively at the two ends of this piston;