CN201180638Y

CN201180638Y - Liquid controlled reversing device of CNG substation hydraulic compressor

Info

Publication number: CN201180638Y
Application number: CNU2008200631460U
Authority: CN
Inventors: 陈永华; 贺方平
Original assignee: ZIGONG DAYE HIGH PRESSURE CONTAINER CO Ltd
Current assignee: ZIGONG DAYE HIGH PRESSURE CONTAINER CO Ltd
Priority date: 2008-04-24
Filing date: 2008-04-24
Publication date: 2009-01-14
Anticipated expiration: 2018-04-24

Abstract

The utility model discloses a hydraulic-control reversing device of a CNG substation hydraulic-pressure compressor, which comprises an oil box, an oil pump, a retaining valve and a pilot overflow valve and is characterized in that a hydraulically operated direction control valve, a hydraulically operated direction control guiding valve and an electromagnetic valve arranged on the pilot overflow valve are also included, wherein, an oil inlet of the hydraulically operated direction control valve is connected with the retaining valve, two working oil ports thereof are respectively connected with oil ports at two ends of a hydraulic cylinder of the compressor, and an oil return port thereof is connected with the oil box; the oil inlet of the hydraulically operated direction control guiding valve is connected with the pilot overflow valve, the oil return port thereof is connected with the oil box, the two working oil ports thereof are respectively connected with reversing oil ports at two ends of the hydraulically operated direction control valve, and sequence valves are respectively arranged on an oil channel that connects one working oil port with the reversing oil port at the corresponding end. The hydraulic-control reversing device has the advantages of high sensitivity and reliability for reversing, and low price.

Description

The liquid controlled reversing device of CNG substation hydraulic pressure compressor

Technical field

The utility model relates to the liquid controlled reversing device of a kind of CNG of being used for substation hydraulic pressure compressor.

Background technique

The main frame of CNG substation hydraulic pressure compressor is made of a double-action oil hydraulic cylinder and two the identical cylinders and the piston assembly thereof that are installed on the oil hydraulic cylinder two ends respectively, the piston rod of cylinder-piston assembly is the prolongation of hydraulic cylinder piston rod, the stroke of oil hydraulic cylinder is the stroke of the piston assembly of cylinder, and the commutation of therefore effectively controlling the hydraulic cylinder piston assembly in hydraulic system promptly equals the commutation of effective control cylinder piston assembly; Existing C NG substation hydraulic pressure compressor adopts electromagnetic reversing arrangement mostly both at home and abroad at present, it comprises fuel tank, oil pump, one-way valve, the electro-hydraulic reversing valve that connects successively, between one-way valve and oil return circuit, also be provided with precursor overflow valve, wherein the return opening of precursor overflow valve and electro-hydraulic reversing valve all is connected with fuel tank, two actuator ports of electro-hydraulic reversing valve link to each other with the hydraulic fluid port at compressor oil hydraulic cylinder two ends respectively, on the piston assembly of compressor, touching lever is installed, on touching lever, is provided with sensitive switch; When piston assembly at stroke at the end, the electromagnet on the electro-hydraulic reversing valve in hydraulic system sends electric signal, in the effect of electromagnet its commutation of ordering; This device need possess two necessary conditions: one, reliable, sensitive touching lever and sensitive switch; Two, owing to the restriction of Environmental Conditions, electro-hydraulic reversing valve must use the flame proof grade; There is bigger difficult point in this reversing arrangement on making, the big problem of the action error that brings because of the insufficient sensitivity of touching lever and sensitive switch usually, thereby make the sensitivity and the reliability decrease of piston assembly commutation; Simultaneously, owing to must adopt the electro-hydraulic reversing valve of flame proof grade, so price is more expensive.

The model utility content

The purpose of this utility model is the above-mentioned deficiency at prior art, and the liquid controlled reversing device of a kind of CNG substation hydraulic pressure compressor is provided, and it has the sensitivity and the high advantage of reliability of commutation, and price is lower.

For achieving the above object, the liquid controlled reversing device of CNG of the present utility model substation hydraulic pressure compressor, comprise fuel tank, oil pump, one-way valve, precursor overflow valve, it is characterized in that also comprising a hydraulicchange-over valve, surge the commutation pilot valve, be installed on the solenoid valve on the precursor overflow valve, wherein the filler opening of hydraulicchange-over valve links to each other with one-way valve, its two actuator port links to each other with the hydraulic fluid port at compressor oil hydraulic cylinder two ends respectively, and its return opening links to each other with fuel tank; Surge the commutation pilot valve filler opening link to each other with precursor overflow valve, its return opening links to each other with fuel tank, its two actuator port links to each other with the commutation hydraulic fluid port at hydraulicchange-over valve two ends respectively, also is respectively equipped with a sequence valve on it connects the oil circuit of an actuator port and the commutation hydraulic fluid port of a corresponding end;

Reversing principle of the present utility model is: when piston in the compressor oil hydraulic cylinder moves when reaching the end to a side, because oil hydraulic cylinder buffering cavity diminishes suddenly, cause system pressure to raise, pilot pressure oil is opened sequence valve through the commutation pilot valve that surges, and pilot pressure oil commutates through the commutation hydraulic fluid port promotion spool of hydraulicchange-over valve correspondence; Because commutation process is finished by hydraulic element entirely, has the high advantage of sensitivity and reliability, the hydraulicchange-over valve and the commutation pilot valve that surges do not have electric elements, no flame proof requirement, and price is lower;

As optimization of the present utility model, on described sequence valve, also be provided with an one-way valve; The first pilot valve of commutation is in the moment of commutation owing to surge, and sequence valve can produce entrap phenomenon, can make the control oil of the moment of commutating be able to the low pressure off-load so one-way valve is set on sequence valve, thereby has guaranteed the steadily reliable of liquid controlled reversing;

As optimization of the present utility model, on surging the oil circuit of commutation filler opening of pilot valve and precursor overflow valve, connection also is provided with hand-operated direction valve; Consider in operating load the unexpected shutdown phenomenon that very likely occurs, hand-operated direction valve can be under different operating modes locked position;

As optimization of the present utility model, on surging the oil circuit of commutation filler opening of pilot valve and precursor overflow valve, connection also is provided with oil strainer; To guarantee the turbidity test of control oil, further improve the sensitivity and the reliability of commutation, prolong the working life of sequence valve;

As optimization of the present utility model, on the oil return circuit that connects hydraulicchange-over valve and fuel tank, be provided with oil cooler and oil strainer, can improve the turbidity test of pressure oil, the temperature of pilot pressure oil, stablize the operating mode of reversing arrangement;

In sum, the utlity model has the sensitivity and the high advantage of reliability of commutation, and price is lower.

Description of drawings

Fig. 1 is the utility model embodiment's a hydraulic schematic diagram;

Fig. 2 is the utility model embodiment's a plan view;

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As depicted in figs. 1 and 2, the liquid controlled reversing device of this embodiment's CNG substation hydraulic pressure compressor, comprise fuel tank 18, oil pump 1, one-way valve 2, hand-operated direction valve 7, oil strainer 6, precursor overflow valve 4, be installed on the solenoid valve 3 on the precursor overflow valve 4, one hydraulicchange-over valve 8, one surge the commutation pilot valve 9, oil cooler 16 and oil strainer 17, wherein the oil inlet P of hydraulicchange-over valve 8 links to each other with one-way valve 2, its two actuator port A links to each other with two oil hydraulic cylinders 14 of compressor and the hydraulic fluid port at 15 two ends respectively with B, its oil return inlet T links to each other with fuel tank 18, and oil cooler 16 is provided with on the oil return circuit that is connected hydraulicchange-over valve 8 and fuel tank 18 with oil strainer 17; Surge the commutation pilot valve 9 oil inlet P link to each other with precursor overflow valve 4, hand-operated direction valve 7 is arranged on the oil circuit that is connected surge commutation pilot valve 9 and precursor overflow valve 4 with oil strainer 6, its oil return inlet T links to each other with fuel tank 18, its two actuator port A links to each other with the commutation hydraulic fluid port at hydraulicchange-over valve 8 two ends respectively with B, on it connects the oil circuit of an actuator port A or B and the commutation hydraulic fluid port of a corresponding end, also be respectively equipped with a

sequence valve

10 or 11, and an one-

way valve

12 or 13 respectively are installed on

sequence valve

10 or 11;

This embodiment's working procedure is:

One, low pressure off-load when not having operating load (machine just started and), this moment oil pump 1 start, solenoid valve 3 energisings:

1, control oil channel: pressure oil → one-way valve 2 → precursor overflow valve 4 → solenoid valve 3 left side position → oil cooler 16 → oil strainer 17 → fuel tanks 18;

2, in-line: pressure oil → one-way valve 2 → precursor overflow valve 4 → oil cooler 16 → oil strainer 17 → fuel tank 18.

Two, during operating load, oil pump 1 startup this moment, solenoid valve 3 outages:

(1) oil hydraulic cylinder 14 pistons are to right lateral and oil hydraulic cylinder 15 pistons left lateral simultaneously:

1, control oil channel: position, the pressure oil → one-way valve 2 → precursor overflow valve 4 → oil strainer 6 → hand-operated direction valve 7 right positions → commutation of surging first pilot valve 9 right position → hydraulicchange-over valve 8 left side;

2, in-line: pressure oil → one-way valve 2 → hydraulicchange-over valve 8 left side P mouth → oil hydraulic cylinder positions, 14 left side and oil hydraulic cylinder 15 right positions;

3, oil circuit: oil hydraulic cylinder 14 right positions and oil hydraulic cylinder 15 left side position → hydraulicchange-over valves 8 left side T mouth → oil cooler 16 → oil strainer 17 → fuel tanks 18;

(2) oil hydraulic cylinder 14 pistons to left lateral and oil hydraulic cylinder 15 pistons to the while right lateral:

When oil hydraulic cylinder 14 pistons to right lateral simultaneously oil hydraulic cylinder 15 pistons when left lateral arrives the end, because two oil

hydraulic cylinders

14 and 15 buffering cavitys diminish suddenly, cause system pressure to raise, control-oil pressure also raises simultaneously; This moment, pilot pressure oil was opened sequence valve 10 through the first pilot valve of the commutation of surging 9 right positions, and the first pilot valve 9 of commutation that promotes to surge commutates to position, a left side; Meanwhile, hydraulic oil after hours directly returns fuel tank 18 through A mouth to the T mouth of the first pilot valve 9 of commutation that surges, at this moment:

1, control oil channel: the first pilot valve 9 left side position → hydraulicchange-over valves of the pressure oil → one-way valve 2 → precursor overflow valve 4 → oil strainer 6 → hand-operated direction valve 7 right positions → commutation of surging 8 right positions;

2, in-line: pressure oil → one-way valve 2 → hydraulicchange-over valve 8 right P mouth → oil hydraulic cylinders, 14 right positions and position, oil hydraulic cylinder 15 left side;

3, oil circuit: oil hydraulic cylinder position, 14 left side and oil hydraulic cylinder 15 right position → hydraulicchange-over valve 8 right T mouth → oil cooler 16 → oil strainer 17 → fuel tanks 18;

When oil hydraulic cylinder 14 pistons to left lateral simultaneously oil hydraulic cylinder 15 pistons when right lateral arrives the end, because two oil

hydraulic cylinders

14 and 15 buffering cavitys diminish suddenly, cause system pressure to raise, control-oil pressure also raises simultaneously; This moment, pilot pressure oil was opened sequence valve 11 through position, the commutation of surging first pilot valve 9 left side, and the first pilot valve 9 of commutation that promotes to surge commutates to right position, repeats (one) flow process in the operating load program;

(one) in the operating load program, (two) flow process are a circulation, two row main frame alternate runs;

Precursor overflow valve 4 is higher than the commutation pilot pressure of

sequence valve

10,11 for system security controls pressure, force value;

The commutation pilot pressure of

sequence valve

10,11 is higher than operating high workload induced pressure;

The leading type electromagnetic relief valve of being made up of precursor overflow valve 4 and solenoid valve 3 has two effects: the first, use as safety valve, and make hydraulic system in the safety pressure value scope of setting, work all the time; The second, non-loaded during unit starting; Can in time unload under the load condition;

Sequence valve the 10, the 11st, one of core parts of liquid controlled reversing device, thus selected highly sensitive cartridge valve for use, and be installed in the control point nearby; The

sequence valve

10,11 of the first pilot valve 9 of commutation after the work of the moment of commutation can produce entrap phenomenon owing to surge, so one-

way valve

12,13 is set respectively on

sequence valve

10,11, the control oil of moment is able to the low pressure off-load even commutate, thereby has guaranteed the steadily reliable of liquid controlled reversing;

The setting of oil strainer 6 can guarantee the turbidity test of control oil channel, guarantees the reliability and the sensitivity that commutate, and these measures can effectively raise the working life of

sequence valve

10,11;

In order to guarantee the stable operation of reversing arrangement, can select the first pilot valve 9 of commutation that surges of band mechanical positioning for use, the positional fluctuation of the commutation device being brought with hydraulic shock in the minimizing system as far as possible;

Consider in operating load the unexpected shutdown phenomenon that very likely occurs, specially be provided with hand-operated direction valve 7, this valve also is with mechanical positioner, can be under different operating modes locked position;

On the oil return circuit that connects hydraulicchange-over valve 8 and fuel tank 18, be provided with oil cooler 16 and oil strainer 17, can improve the turbidity test of pressure oil, the temperature of pilot pressure oil, stablize the operating mode of reversing arrangement.

Claims

1, the liquid controlled reversing device of a kind of CNG substation hydraulic pressure compressor, comprise fuel tank, oil pump, one-way valve, precursor overflow valve, it is characterized in that also comprising a hydraulicchange-over valve, surge the commutation pilot valve, be installed on the solenoid valve on the precursor overflow valve, wherein the filler opening of hydraulicchange-over valve links to each other with one-way valve, its two actuator port links to each other with the hydraulic fluid port at compressor oil hydraulic cylinder two ends respectively, and its return opening links to each other with fuel tank; Surge the commutation pilot valve filler opening link to each other with precursor overflow valve, its return opening links to each other with fuel tank, its two actuator port links to each other with the commutation hydraulic fluid port at hydraulicchange-over valve two ends respectively, also is respectively equipped with a sequence valve on it connects the oil circuit of an actuator port and the commutation hydraulic fluid port of a corresponding end.

2, the liquid controlled reversing device of CNG according to claim 1 substation hydraulic pressure compressor is characterized in that also being provided with an one-way valve on described sequence valve.

3, the liquid controlled reversing device of CNG according to claim 1 and 2 substation hydraulic pressure compressor is characterized in that also being provided with hand-operated direction valve on the oil circuit of the filler opening of commutation pilot valve and precursor overflow valve is surged in connection.

4, the liquid controlled reversing device of CNG according to claim 1 and 2 substation hydraulic pressure compressor is characterized in that also being provided with oil strainer on the oil circuit of the filler opening of commutation pilot valve and precursor overflow valve is surged in connection.

5, the liquid controlled reversing device of CNG according to claim 1 and 2 substation hydraulic pressure compressor is characterized in that being provided with oil cooler and oil strainer on the oil return circuit that connects hydraulicchange-over valve and fuel tank.