CN201003525Y - Quick-speed lift oil pump - Google Patents

Abstract

The utility model relates to a high sped lifting oil pump, which comprises a pump pressure oil cylinder, a pump pressure piston rod, a lifting oil cylinder, a lifting piston rod, an oil tank, a valve and an oil tube. The utility model is characterized in that: the lifting piston rod is in a pole-shaped structure with the upper piston rod and the lower piston rod having different thickness in a one body with two sections manner. The lifting oil cylinder is divided into the upper oil cylinder and the lower oil cylinder, and the upper oil cylinder and the lower oil cylinder are communicated through at least one valve in a one-way manner. The utility model breaks away the thinking model that: the prior art adjusts the lifting speed of the lifting piston rod by depending on changing the working area of the hydraulic oil from the pump pressure piston rod, and the utility model is fit for changing of the hydraulic oil under different loading condition through the manner of changing receiving hydraulic oil vertical pushing force area for the lifting piston rod, thereby realizing the automatic adjusting of the hydraulic oil flow quantity in the oil pump, further realizing the rapid lifting or low speed lifting for the lifting piston rod in different working conditions. The manner can eliminate the bubble problem in the hydraulic system and rapidly improve the reliability of the oil pump for promoting.

Description

The fast lifting oil pump

Technical field

The utility model belongs to the fast lifting oil pump technology field, particularly a kind of piston rod construction of fast lifting oil pump.

Technical background

The fast lifting oil pump can be regulated the pressure and the flow of hydraulic oil automatically according to the load size, realizes the automatic change of lifting piston rod lifting speed, particularly is implemented in the purpose that the lifting piston rod is risen fast.The structural feature of fast lifting oil pump is by pump pressure piston rod in the change pump pressure oil cylinder work area of hydraulic oil to be realized the change of hydraulic fluid flow rate under the different oil pressure condition in the market, thereby changes the lifting speed of lifting piston rod in the elevating ram.Chinese patent 00223518.8 discloses a kind of speed oil pump, be characterized on the pump pressure piston rod, being equipped with a sucker, be provided with " fourth " font through hole at pump pressure piston rod front end, be connected with a magnet in the plunger lower end, sucker and magnet rely on the suction of magnet to connect, when pump pressure oil cylinder internal pressure greater than magnet during to the suction of sucker, plunger separates with the pump pressure piston rod, plunger does not move with the pump pressure piston rod, this moment the area of hydraulic working oil only is equivalent to the area of section of pump pressure piston rod; When pump pressure oil cylinder internal pressure less than magnet during to the suction of sucker, plunger combines with the pump pressure piston rod, plunger moves with the pump pressure piston rod and moves, this moment the area of hydraulic working oil is equivalent to the area of section sum of pump pressure piston rod and plunger, in this state, when the pump pressure piston rod was descending, the hydraulic fluid flow rate that the pump pressure oil cylinder injects in elevating ram was bigger, made lifting piston rod fast lifting.Though this design to pump pressure piston rod and piston structure can make such as simple Hydraulic power tools such as jack under the less situation of load fast lifting lifting piston rod to by lifting object place, but because the existence of cavity between pump pressure oil cylinder internal upper part plunger and cylinder body, air must penetrate into and form bubble in the hydraulic oil, and bubble can cause great negative effect to the reliability of hydraulic system.

Summary of the invention

To be solved in the utility model is that the fast lifting oil pump forms the problem that bubble causes Hydraulic System Reliability to descend in the hydraulic oil because of air enters.Purpose is to provide does not have the fast lifting of bubble oil pump in a kind of hydraulic oil, this fast lifting oil pump reliability is higher.

For achieving the above object, solution of the present utility model is: a kind of fast lifting oil pump, comprise pump pressure oil cylinder, pump pressure piston rod, elevating ram, lifting piston rod, fuel tank, valve and oil pipe etc., it is characterized in that: the lifting piston rod is the upper piston rod one two-part column structure different with the lower piston rod thickness, elevating ram is divided into upper cylinder and following oil cylinder, communicates by at least one valve is unidirectional between upper cylinder and the following oil cylinder.

The one two-part column lifting piston rod that aforementioned thickness is different can be made into up big and down small shape, and wherein upper piston rod is thicker, and lower piston rod is thinner, and upper piston rod and lower piston rod are in downward annular surface of the common formation of joining place.

Be matched in the structure of aforementioned up big and down small one two-part column lifting piston rod, between pump pressure oil cylinder and upper cylinder, be connected with corresponding oil circuit by an one-way valve that has Returnning spring, this one-way valve can only be opened to upper cylinder, promptly under the condition that does not have other external force to interfere, hydraulic oil only may flow into upper cylinder from the pump pressure oil cylinder; The one-way valve that has Returnning spring by two series connection between pump pressure oil cylinder and following oil cylinder is connected with corresponding oil circuit, these two one-way valves are oil cylinder unlatching downwards all, be that hydraulic oil only may flow into oil cylinder down from the pump pressure oil cylinder, and be significantly less than the close one-way valve Returnning spring power of oil cylinder down near the one-way valve Returnning spring power of pump pressure oil cylinder; Be connected with corresponding oil circuit by an one-way valve between upper cylinder and following oil cylinder, this one-way valve can only be opened to upper cylinder, and promptly hydraulic oil only may flow into upper cylinder from following oil cylinder; Be connected with corresponding oil circuit by an one-way valve that has Returnning spring between oil cylinder and the hydraulic oil container down, this one-way valve oil cylinder is downwards opened, and promptly hydraulic oil only may flow into oil cylinder down from hydraulic oil container; Be connected with corresponding oil circuit by an one-way valve between pump pressure oil cylinder and hydraulic oil container, this one-way valve can only be opened to the pump pressure oil cylinder, and promptly under the condition that does not have other external force to interfere, hydraulic oil only may be from hydraulic oil container inflow pump compressing cylinder.

For realizing the decline function of lifting piston rod, hydraulic system structure is simplified, the spool of the one-way valve between aforementioned pump pressure oil cylinder and the upper cylinder and the valve rod of the one-way valve between pump pressure oil cylinder and the hydraulic oil container, steel ball etc. are directly controlled by external force all can and produce interlock, realize the unlatching of these one-way valves under reverse oil press strip spare.

It is cylindric that aforementioned up big and down small one two-part column lifting piston rod is made into usually that the upper piston rod diameter is big, the lower piston rod diameter is less, and upper piston rod and lower piston rod form a downward circular surface in that joining place is common.

Compared with prior art, advantage of the present utility model is: accept the change that the mode of hydraulic oil longitudinal thrust area adapts to hydraulic fluid pressure under the different loads condition by changing the lifting piston rod, thereby the automatic adjusting of hydraulic fluid flow rate in the realization oil pump, and then realize that fast lifting or the overflow speed of lifting piston rod under different operating modes promotes.This mode can be eliminated the air bubble problem in the hydraulic system, and therefore the reliability of fast lifting oil pump is improved.

Description of drawings

Fig. 1 is the utility model hydraulic principle schematic representation.

Fig. 2 is the generalized section of a kind of one-way valve between upper cylinder and the following oil cylinder.

Fig. 3 comprises the utility model hydraulic principle schematic representation of a kind of one-way valve structures that links being analysed and observe expression.

In institute's drawings attached, the numbering of component is as follows: the 10-hand pump; 11-pump pressure oil cylinder; 12-pump pressure piston rod; 21-valve A; 22-valve B; 23-valve C; 24-valve D; 25-valve E; The 30-hydraulic oil container; The 41-upper cylinder; Oil cylinder under the 42-; The 43-upper piston rod; The 44-lower piston rod; The 211-valve rod; The 212-steel ball; The 221-spool; The 251-steel ball; The 252-lining; The 253-packing ring.

Embodiment

With reference to figure 1, can structural feature of the present utility model and working procedure be described successively according to three kinds of different working conditions.

First kind of working condition, when promptly under not having the less situation of load or load, promoting the lifting piston rod, in conjunction with Fig. 3 as can be known, pump pressure piston rod 12 in the hand pump 10 moves downward, hydraulic oil in the extrusion pump compressing cylinder 11 enters oil pipe and valve B22, valve B22 is an one-way valve that has Returnning spring, and hydraulic oil overcomes spring force and valve B22 backed down the upper half part that enters elevating ram--upper cylinder 41.Holding cylindric upper piston rod 43 in the upper cylinder 41.The diameter of upper piston rod 43 is greater than cylindric lower piston rod 44, the lifting piston rod that the upper piston rod 43 and the lower piston rod 44 of different-diameter forms a whole, and form a downward annulus surface in this lifting diameter of piston rod change place.Hydraulic oil acts on longitudinal pressure on this annulus surface, promotes the lifting piston rod and moves upward; At this moment, produce negative pressure in holding the following oil cylinder 42 of small piston rod 44, the faint elastic force that therefore hydraulic oil overcome valve D24 Returnning spring enters down oil cylinder 42.In engineering practice, there is difference can form a downward annulus surface of effectively accepting the hydraulic oil longitudinal pressure slightly as long as the diameter of upper piston rod 43 and lower piston rod 44 made, therefore pump pressure piston rod 12 needs only a small amount of hydraulic oil is pressed into upper cylinder 41 usually, get final product fast lifting upper piston rod 43, cause whole lifting piston rod fast lifting.Under this operating mode, when valve B22 opened, the valve C23 that Returnning spring power is bigger was not backed down as yet, so there is not hydraulic oil to enter down oil cylinder 42 by valve C23.Under this operating mode, the oil pressure in the upper cylinder 41 is more than or equal to the oil pressure in the following oil cylinder 42, and valve E25 seals.

Second kind of working condition, when promptly under the bigger situation of load, promoting the lifting piston rod, in conjunction with Fig. 3 as can be known, along with pump pressure piston rod 12 in the hand pump 10 moves downward, hydraulic oil flows into upper cylinder 41 by valve B22 on the one hand, back down valve C23 on the other hand and flow into oil cylinder 42 down, in upper cylinder 41 and following oil cylinder 42 under the common promotion of hydraulic oil, whole lifting piston rod begins or continues to overcome the bigger load lifting that makes progress.Because this moment, hydraulic oil needed simultaneously the bottom surface of aforementioned downward annulus surfaces that formed jointly by upper piston rod 43 and lower piston rod 44 and the lower piston rod 44 ability jack-up lifting piston rod of exerting pressure, so for the identical stroke of pump pressure piston rod 12 under not having the less working condition of load or load, the lifting action of lifting this moment piston rod is slower.

The third working condition, promptly when the lifting piston rod descends, in conjunction with the accompanying drawings 2 and accompanying drawing 3 shown in, under the direct effect of external force, the valve rod 211 of valve A21 backs down steel ball 212 and then the spool 221 of valve B22 is backed down, valve A21 and valve B22 realize interlock, and the reverse flow under the effect of load of the hydraulic oil in the upper cylinder 41 is got back to hydraulic oil container 35 through valve B22 and valve A21; Meanwhile, because the hydraulic oil oil pressure descends in the upper cylinder 41, in upper cylinder 41 and following oil cylinder 42 under the effect of oil pressure difference, hydraulic oil in the following oil cylinder 42 jack-up steel ball 251 that makes progress, by being formed on the valve opening in the lining 252, enter upper cylinder 41, flow back to hydraulic oil container 35 then, as shown in Figure 2, packing ring 253 can stop steel ball 251 dislocations.In this state, valve C23 and valve D24 close.

Claims (9)

1. fast lifting oil pump, comprise pump pressure oil cylinder, pump pressure piston rod, elevating ram, lifting piston rod, fuel tank, valve and oil pipe Sealing etc., it is characterized in that: the lifting piston rod is the upper piston rod one two-part column structure different with the lower piston rod thickness, elevating ram is divided into upper cylinder and following oil cylinder, communicates by at least one valve is unidirectional between upper cylinder and the following oil cylinder.

2. fast lifting oil pump as claimed in claim 1, it is characterized in that: the big up and small down shape of one two-part column lifting piston rod that described thickness is different, wherein upper piston rod is thicker, lower piston rod is thinner, and upper piston rod and lower piston rod are in downward annular surface of the common formation of joining place.

3. fast lifting oil pump as claimed in claim 2 is characterized in that: be connected with corresponding oil circuit by an one-way valve that has Returnning spring between pump pressure oil cylinder and upper cylinder, this one-way valve can only be opened to upper cylinder.

4. fast lifting oil pump as claimed in claim 2 is characterized in that: the one-way valve that has Returnning spring by two series connection between pump pressure oil cylinder and following oil cylinder is connected with corresponding oil circuit, and these two one-way valves are oil cylinder unlatching downwards all; One-way valve Returnning spring power near the pump pressure oil cylinder is significantly less than the close one-way valve Returnning spring power of oil cylinder down.

5. fast lifting oil pump as claimed in claim 2 is characterized in that: be connected with corresponding oil circuit by an one-way valve between upper cylinder and following oil cylinder, this one-way valve can only be opened to upper cylinder.

6. fast lifting oil pump as claimed in claim 2 is characterized in that: be connected with corresponding oil circuit by an one-way valve that has Returnning spring between oil cylinder and the hydraulic oil container down, this one-way valve oil cylinder is downwards opened.

7. fast lifting oil pump as claimed in claim 2 is characterized in that: be connected with corresponding oil circuit by an one-way valve between pump pressure oil cylinder and hydraulic oil container, this one-way valve can only be opened to the pump pressure oil cylinder.

8. fast lifting oil pump as claimed in claim 2 is characterized in that: between pump pressure oil cylinder and the upper cylinder between one-way valve and pump pressure oil cylinder and the hydraulic oil container one-way valve structurally link.

9. fast lifting oil pump as claimed in claim 2, it is characterized in that: up big and down small one two-part column lifting piston rod is presented cylindric that diameter of piston rod is big, the lower piston rod diameter is less, and upper piston rod and lower piston rod are on downward circular surface of the common formation of joining place.

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