CN1103703A

CN1103703A - Hydraulic automatic control high pressure reciprocating pump

Info

Publication number: CN1103703A
Application number: CN 94112446
Authority: CN
Inventors: 刘恩兆
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-23
Filing date: 1994-08-23
Publication date: 1995-06-14
Anticipated expiration: 2014-08-23
Also published as: CN1063834C

Abstract

Used for the output of gases and liquids, the said high-pressure reciprocating pump consists of oil cylinder, connector with oil cylinder, piston and piston rod, working cylinders on two sides and admission and exhaust valves. It features the valve body cavity in the connector and the outer valve body notch corresponding to oil port of the connector, which ensures reciprocating change-over. Unlike available reciprocating pumps, whose piston rod acts as valve rod and connector acts as valve body, the said one is easy to machine, long in life, flexible and reliable.

Description

Hydraulic automatic control high pressure reciprocating pump

The present invention relates to a kind of pump in the hydraulics field, especially a kind of reciprocating pump of in valve body, controlling commutation automatically.

In hydraulic system, the method for control reciprocating pump commutation operation mainly is to adopt automatically controlled mode, just utilizes solenoid valve commutation or induction commutation at present.These methods cause the equipment complexity inevitably, the manufacture cost height, and its fatal shortcoming is automatically controlled malfunctioning phenomenon very easily to occur, is difficult to search reason.This address the above problem, in the prior art, the partial design that will commutate is in the pump housing, denomination of invention as Patent Office of the People's Republic of China's one nine nine zero year authorization on February 21 bulletins is " a multipurpose fluid power moving piston pump ", authorization number is CN1006925, its structure is: the middle part is oil cylinder and piston, the piston both sides are connected to piston rod, piston rod is complementary with the connecting body that is fixed on the oil cylinder, the double as selector valve of piston rod valve rod own, connecting body double as change valve, though this structure is simplified, there are the following problems, because the quality of fit between valve rod and the valve body is had relatively high expectations, so add man-hour dimensional accuracy and surface roughness be difficult to reach designing requirement, after particularly using a period of time, the gap between the connecting body of the piston rod of double as valve rod and double as valve body is strengthened, and causes leakage, influence commutation effect, it is malfunctioning finally to cause commutating.This structure is because the own wt of piston and piston rod can produce the inclined to one side phenomenon of mill.In addition in piston motion when end points commutates, in system, also can produce pulsatile impact.

The purpose of this invention is to provide a kind of processing of being convenient to, the hydraulic automatic control high pressure reciprocating pump that during commutation and the gap between piston rod and the connecting body is irrelevant is to guarantee the commutation flexibility and reliability.

Technical solution of the present invention is: a kind of hydraulic automatic control high pressure reciprocating pump, it comprises oil cylinder 10, the piston 8 that is complementary with oil cylinder 10, the piston rod 11 that joins with piston 8 both sides, 23, piston rod 11 and connecting body 24, piston rod 23 is complementary with connecting body 5, the both sides of oil cylinder 10 and connecting

body

24,5 join, connecting body and clutch release slave cylinder 25, connecting body 5 joins with clutch release slave cylinder 4, it also comprises and clutch release slave cylinder 4, the liquid discharging valve 2 that 25 inner chambers communicate, 27 feed liquor valves 3,28, connecting body 5, be equipped with a cavity in 24, be provided with the valve rod 20 that control piston 8 puts in place and commutates in the cavity, 26.Be respectively equipped with

groove

29,30,31 on the cylindrical of valve rod 20, the hydraulic fluid port 36,37,38 that connecting body communicates when being provided with the commutation of described cavity, groove 29 is corresponding with hydraulic fluid port 38, groove 30 communicates with the center hole 33 of valve rod 20, the termination of valve rod 20 also is provided with the draining hole 39 that communicates with center hole 33, and oil cylinder 10 is provided with oil inlet and outlet 34,35.The structure of the valve rod 26 in the cavity on the connecting body 24 and connecting body 24 are all symmetrical with connecting body 5 and valve rod 20 with valve rod 26 corresponding hydraulic fluid ports.

Be equipped with the cavity that communicates with oil cylinder 10 inner chambers on the inwall of the lower

curtate connecting body

34,5 of described piston rod 11,23, and one-way valve 9,40 is housed.Cavity top is to lean on the outer surface of piston rod 11,23 to seal.

Described connecting body 5, also be provided with one in 24 and place valve rod 41,42 cavity, the cylindrical of valve rod 41 is provided with groove 43, during groove 43 commutation and hydraulic fluid port 44,45 correspondences, also be provided with passage 46 in the connecting body 5, passage 46 is communicated with the inner chamber of oil cylinder 5 with the cavity in the connecting body 5 is inner, hydraulic fluid port 47 on the connecting body 24,48, groove 50 on passage 49 and the valve rod 42 all with connecting body 5 one side symmetries, hydraulic fluid port 45,47,52 is the normal open oil circuit, connecting body 51 joins with oil cylinder 53, the piston 54 that is complementary with oil cylinder 53 is connected to piston rod 55, piston rod 55 is complementary with connecting body 51, clutch release slave cylinder 64 joins with connecting body 51, feed liquor valve 66, liquid discharging valve 65 is communicated with clutch release slave cylinder 64 inner chambers, also be provided with hydraulic fluid port 56 on the connecting

body

51,58, valve rod 57 cylindricals in connecting body 51 upper plenums are provided with and

hydraulic fluid port

52,58, corresponding groove 62 during 56 commutations, 60,67, valve rod 57 shaft axis places are provided with center hole 68.Groove 60 is communicated with center hole 68, valve rod 57 terminations also are provided with drain tap 63, oil cylinder 53 is provided with hydraulic fluid port 59, hydraulic fluid port 44,48 joins with the hydraulic control mouth of selector valve 69 respectively, the hydraulic fluid port of selector valve 69 joins with the hydraulic control mouth at the two ends of

hydraulic fluid port

58,72 and selector valve 70 respectively, hydraulic fluid port 59 on the hydraulic fluid port of selector valve 70 and the oil cylinder 53, hydraulic fluid port 52 and the fuel tank on the connecting body 51 join, and hydraulic fluid port 56 is connected to the scavenger valve 71 that joins with fuel tank, the left and right sides symmetry of piston 54.

The lower curtate connecting body 51 of described piston rod 55 is provided with cavity, and cavity is communicated with oil cylinder 53 inner chambers, and is provided with one-way valve, and cavity top is to lean on the cylindrical of piston rod 51 to seal the left and right sides symmetry of piston 54.

The present invention compared with prior art, owing in connecting body, be processed with a cavity, the employed valve rod that commutates places in the cavity, by the axial motion in cavity of piston motion collision valve rod, reach the purpose of commutation, owing to set cavity arranged, stem diameter is less, is far smaller than diameter of piston rod again, for the less part of size, when machining, be easy to reach designing requirement, changed piston rod double as valve rod in the prior art, the structure of connecting body double as valve body, so the present invention has processing simply, be easy to reach the requirement of machining accuracy, commutation flexibility and reliability durable in use has promptly reduced processing cost, has reduced the maintenance cost in the using process again.Because of being provided with the cavity that communicates with cylinder cavity between the lower curtate of piston rod and the connecting body, and be provided with one-way valve, can charge into high pressure oil during work, support piston is owing to there is the control of one-way valve, high pressure oil can't let out, therefore also solved because the inclined to one side phenomenon of mill that piston and piston rod deadweight cause, after the pump housing of two or more structural similarities is connected (as Fig. 2), join with selector valve again, promptly control one or more driven pump housings with active efflux, can solve the pulsatile impact in the hydraulic system effectively, reason is that the piston in the pump housing always arrives the end points commutation with different sequencings, promptly forms differential.

Below in conjunction with the drawings and the specific embodiments the present invention is further described:

Fig. 1 is the structure and the fundamental diagram of the specific embodiment of the invention;

Fig. 2 is in the specific embodiment of the invention, structure that principal and subordinate's pump housing joins and fundamental diagram.

As shown in Figure 1: 10 is oil cylinder, 8 is the piston that matches with oil cylinder 10, the both sides of piston 8 are provided with the piston rod 11 and 23 that is structure as a whole with piston 8, piston rod 11,23 and connecting

body

24,5 match, connecting

body

24,5 is connected with the two ends bolt of oil cylinder 10, is provided with seal ring between piston rod and the connecting body.The equal bolt in the end of connecting

body

24,5 connects clutch

release slave cylinder

25,4, and the clutch release slave cylinder termination also is connected with the cylinder head 1 of band

liquid discharging valve

2,27 and feed liquor valve 3,28 with bolt.Advance valve and valve and all adopt one-way valve in the hydraulic system, each one of feed liquor valve, liquid discharging valve just all is housed on each cylinder head.Also be provided with oil inlet and outlet 34,35(on the oil cylinder 10 referring to Fig. 1).

As shown in Figure 1: cavity that places valve rod 20 of processing on connecting body 5, also be processed with the hydraulic fluid port 36,37,38 that communicates with described cavity on the connecting body 5,

corresponding groove

31,30, the 29 when cylindrical of valve rod 20 is processed with hydraulic fluid port 36,37,38 commutations, groove 30 communicates with center hole 33 on the valve rod 20, and the termination of valve rod 20 also is provided with the draining hole 39 that communicates with center hole 33.

Between piston rod 23 lower curtates and connecting body 5, the cavity 32 that processing communicates with oil cylinder 10 inner chambers on the connecting body 5, and one-way valve 9 is housed, cavity 32 tops are the support piston of coming by the outer surface sealing of piston rod 23, to overcome the inclined to one side phenomenon of mill that causes because of piston and piston rod deadweight.

Its working procedure is: as shown in Figure 1: the hydraulic fluid port on the connecting

body

5,24 of bilateral symmetry structure and selector valve 13, relief valve 18,19 and high pressure oil pump 17 are joined, when motor 14 drives high pressure oil pump 17 work, high pressure oil is through hydraulic fluid port 36, groove 31, hydraulic fluid port 37 make the valve rod of selector valve 13 be in right position, high pressure oil enters the left side of oil cylinder 10 inner chamber pistons 8 through hydraulic fluid port 34 simultaneously, promoting piston moves to the right, make valve rod 26 move to left (as shown in Figure 1 position) because the high pressure oils in the hydraulic fluid port 37 charge in the valve rod 26 right-hand member cavitys in the connecting body 24 this moment.In this stroke, clutch release slave cylinder 4 inner chambers are owing to piston rod 23 moves to right, volume enlarges, feed liquor valve 3 is opened the suction medium, liquid discharging valve 2 is closed, and the inner chamber of clutch release slave cylinder 25 is because the moving to right of piston rod 11, and volume dwindles, liquid discharging valve 27 is opened, discharge medium, feed liquor valve 28 cuts out, during because of work, advance valve 3 and 28 all with always advance valve and join,

valve

2,27 join with total valve, so in this one stroke, finished a process of advancing to discharge medium, when piston 8 moves to right-hand member collision valve rod 26, valve rod 26 is moved to right, cause high pressure oil by the groove on the valve rod 26 the hydraulic fluid port P1 on the connecting body 24 to be communicated with Y, hydraulic fluid port 38 charges into high pressure oil on the connecting body 5, valve rod 20 moves to right under the high pressure oil effect, at this moment, selector valve 13 right-hand member hydraulic control mouths communicate with high pressure oil, and the valve rod of selector valve 13 is in position, a left side, left end hydraulic control mouth fluid is through hydraulic fluid port 37, groove 30, center hole 33, draining hole 39 communicates with the inner chamber of oil cylinder 10, and flows back to fuel tank through hydraulic fluid port 34.Simultaneously high pressure oil enters oil cylinder 10 inner chamber piston right sides from hydraulic fluid port 35, and promotes piston and move to left, and with these heavy clothes, reaches the purpose that sucks and discharge medium.Its working medium can be various gas, liquid.

As shown in Figure 2: the bottom is the active pump housing, top is the driven pump housing, promptly by upper and lower, two-part are formed a binary pump, as can be seen from Figure 2, the pump housing on top is identical with the above pump housing, and institute's difference is: connecting

body

5,24 also is provided with cavity and the passage 46,49 that places valve rod 41,42 on the active pump housing of bottom, and be provided with valve rod 41 cylindricals on groove 43 corresponding hydraulic fluid ports 44,45, corresponding hydraulic fluid port 47,48 during with groove 50 commutation on valve rod 42 cylindricals.Hydraulic fluid port 44,48 joins with the hydraulic control mouth of selector valve 69 respectively, the hydraulic fluid port of selector valve 69 joins with the hydraulic control mouth of fuel tank 16, selector valve 70 both sides,

hydraulic fluid port

56,58 on the connecting body 51 respectively, and the hydraulic fluid port of selector valve 70 joins (as shown in Figure 2) with hydraulic fluid port 59, the outlet of high pressure oil pump 17, fuel tank respectively.

Its working procedure is: as shown in Figure 2: the liquid discharging valve of the upper and lower pump housing is all joined with total valve, advance valve all with always advance valve and join.When motor 14 drives high-pressure service pump 17 work, the pump housing of bottom can be by above-mentioned described working procedure work, and the pump housing on top is by piston 8 collision valve rods 41,42 and connect selector valve 69, make top pump housing work by selector valve 69 control selector valves 70 again, promptly colliding valve rod 41 before piston 8 arrives the left end head is moved to the left, this moment, high pressure oil was by hydraulic fluid port 45, groove 43, hydraulic fluid port 44 makes selector valve 69 right-hand member hydraulic control mouths be in high pressure, and transposition is connected, selector valve 70 is worked by the selector valve 69 control transposition driving top pump housings, that is to say before the commutation of bottom pump housing piston, piston in the pump housing of top is just started working, guaranteed differentially, eliminated the pulsatile impact phenomenon in the hydraulic system.

The present invention is not only limited to above-mentioned mode of execution, and any possible mode all belongs to basic thought of the present invention.

Claims

1, a kind of hydraulic automatic control high pressure reciprocating pump, it comprises oil cylinder [10], the piston [8] that is complementary with oil cylinder [10], the piston rod [11] that joins with piston [8] both sides, [23], piston rod [11] and connecting body [24], piston rod [23] is complementary with connecting body [5], the both sides of oil cylinder [10] and connecting body [24], [5] join, connecting body [24] and clutch release slave cylinder [25], connecting body [5] joins with clutch release slave cylinder [4], it also comprises and clutch release slave cylinder [4], [25] liquid discharging valve [2] that communicates of inner chamber, [27] feed liquor valve [3], [28], it is characterized in that: connecting body [5], [24] be equipped with a cavity in, be provided with the valve rod [20] that control piston [8] puts in place and commutates in the cavity, [26], be respectively equipped with groove [29] on the cylindrical of valve rod [20], [30], [31], the hydraulic fluid port [36] that connecting body communicates when being provided with the commutation of described cavity, [37], [38], groove [29] is corresponding with hydraulic fluid port [38], groove [30] communicates with the center hole [33] of valve rod [20], the termination of valve rod [20] also is provided with the draining hole [39] that communicates with center hole [33], oil cylinder [10] is provided with oil inlet and outlet [34], [35], the structure of the valve rod [26] in the cavity on the connecting body [24] and connecting body [24] are all symmetrical with connecting body [5] and valve rod [20] with the corresponding hydraulic fluid port of valve rod [26].

2, hydraulic automatic control high pressure reciprocating pump according to claim 1, it is characterized in that: be equipped with the cavity that communicates with oil cylinder [10] inner chamber on the lower curtate connecting body [34] of described piston rod [11], [23], the inwall of [5], and one-way valve [9], [40] are housed, cavity top is to lean on the outer surface of piston rod [11], [23] to seal.

3, hydraulic automatic control high pressure reciprocating pump according to claim 1 and 2, it is characterized in that: described connecting body [5], [24] also be provided with one in and place valve rod [41], [42] cavity, the cylindrical of valve rod [41] is provided with groove [43], groove [43] commutation and hydraulic fluid port [44], [45] correspondence, also be provided with passage [46] in the connecting body [5], passage [46] is communicated with the inner chamber of oil cylinder [5] with the cavity in the connecting body [5] is inner, hydraulic fluid port [47] on the connecting body [24], [48], groove [50] on passage [49] and the valve rod [42] all with connecting body [5] one side symmetries, hydraulic fluid port [45], [47] with connecting body [51] on hydraulic fluid port [52] be the normal open oil circuit, connecting body [51] joins with oil cylinder [53], the piston [54] that is complementary with oil cylinder [53] is connected to piston rod [55], piston rod [55] is complementary with connecting body [51], clutch release slave cylinder [64] joins with connecting body [51], feed liquor valve [66], liquid discharging valve [65] is communicated with clutch release slave cylinder [64] inner chamber, also be provided with hydraulic fluid port [56] on the connecting body [51], [58], valve rod [57] cylindrical in connecting body [51] upper plenum is provided with and hydraulic fluid port [52], [58], corresponding groove [62] when [56] commutating, [60], [67], valve rod [57] shaft axis place is provided with center hole [68], groove [60] is communicated with center hole [68], valve rod [57] termination also is provided with drain tap [63], oil cylinder [53] is provided with hydraulic fluid port [59], hydraulic fluid port [44], [48] join with the hydraulic control mouth of selector valve [69] respectively, the hydraulic fluid port of selector valve [69] respectively with hydraulic fluid port [58], [72] the hydraulic control mouth with the two ends of selector valve [70] joins, hydraulic fluid port [59] on the hydraulic fluid port of selector valve [70] and the oil cylinder [53], hydraulic fluid port [52] and fuel tank on the connecting body [51] join, hydraulic fluid port [56] is connected to the scavenger valve [71] that joins with fuel tank, the left and right sides symmetry of piston [54].

4, hydraulic automatic control high pressure reciprocating pump according to claim 3, it is characterized in that: the lower curtate connecting body [51] of described piston rod [55] is provided with cavity, cavity is communicated with oil cylinder [53] inner chamber, and be provided with one-way valve, cavity top is to lean on the cylindrical of piston rod [51] to seal the left and right sides symmetry of piston [54].