CN209294158U - A kind of check valve and hydraulic tool for hydraulic tool - Google Patents

Abstract

The utility model belongs to hydraulic tool technical field, refers in particular to a kind of check valve and hydraulic tool for hydraulic tool.This is used for the check valve of hydraulic tool, including the valve seat, valve body and the spool and spring being arranged between valve seat and valve body being fixed in valve opening, the valve seat opens up a through-hole, spring is connected between spool and valve body, under the elastic force effect of the spring, the plane of the spool upper end can lean with the valve seat lower end surface and form primary sealing area；The valve body bottom end is evenly equipped with several flowing holes, and when spool upper surface is separated with valve seat lower end surface, flowing hole is connected to through-hole, and the medium in the through-hole is flowed out by flowing hole.The shape by changing spool, uses flat seal between spool and valve body, in addition reduce sealing contact surface between the two so that its sealing performance greatly promotes, prevent during the work time check valve there is the appearance of the case where reversed oil return.

Description

A kind of check valve and hydraulic tool for hydraulic tool

Technical field

The utility model belongs to hydraulic tool technical field, refers in particular to a kind of check valve for hydraulic tool and hydraulic work Tool.

Background technique

Currently, a kind of dynamical element of the hydraulic tool as hydraulic system, including multiple types, wherein Electric hydraulic tool Motor, shoe cream room, hydraulic pump, hydraulic cylinder, switch block, control valve are generally comprised, is equipped with reset spring and work in hydraulic cylinder Stopper rod, Electric hydraulic tool drive hydraulic pump rotation at work, by motor, the pressure oil in shoe cream room are pressed into hydraulic In cylinder and hydraulic unit is pushed to be at the state of work, oil liquid is sucked from oil bag, then formed pressure oil and be then exhausted from, It works until sending to executive component；The core work position of hydraulic tool is the pump housing, and pump body offers valve opening, valve It will be installed check valve in hole, usually so as to unidirectional disengaging and transport of the oil liquid in valve opening.

As Chinese patent literature data discloses a kind of hydraulically-controlled one-way valve [application number: 201420357673.8 of proposition；Authorization Notification number: CN203948362U], including by ball support, steel ball, retaining ring composition, by by the diameter and ontology of spherical spool The mode that the diameter of section size of inner via hole matches to carry out spool radial limit, enables spool always along body shaft Line direction is mobile, although overcoming the deficiency that spool moves radially after leaving sealing surface, but will receive spool certainly Body gravity and the problem for leakproofness deficiency occur, occur spool often moved radially after leaving sealing surface and against On inner sidewall, spring pushes spool mobile to sealing surface direction, and at this moment spherical spool is when closed it is possible that leakage, makes The oil liquid reverse flow in check valve is obtained, causes working efficiency low, reliability substantially reduces.

Utility model content

The purpose of the utility model is to provide a kind of good seal performance, anti-loosening property is good, work efficiency is high, long service life Hydraulic tool check valve.

Purpose of the utility model is realized as follows: a kind of check valve for hydraulic tool, including it is fixed on valve opening Interior valve seat, valve body and the spool and spring being arranged between valve seat and valve body, the valve seat open up a through-hole, and spring supports It connects between spool and valve body, under the elastic force effect of the spring, the plane of the spool upper end can be with the valve seat lower end Face leans and forms primary sealing area；The valve body bottom end is evenly equipped with several flowing holes, when under spool upper surface and valve seat When end face separates, flowing hole is connected to through-hole, and the medium in the through-hole is flowed out by flowing hole.

Preferably, inner sidewall compatible with spool shape size is offered in the valve body, the inner sidewall is to spool It carries out radial limit and the spool is enable to move always along its axis direction.

Preferably, the plane of the spool lower end is convexly equipped with the guide post being installed in spring, offers in the valve body Mounting groove compatible with spring outer diameter size, the spring are connected in guide post and mounting groove.

Preferably, the valve body bottom surface is the first tapered surface, is installed on O-ring seal on first tapered surface.

Preferably, the valve seat upper end offers interior hexagonal and screws slot, is equipped on the outside of the valve seat for being fixed on valve opening The external screw thread of upper inner wall.

Preferably, the valve seat lower end surface is convexly equipped with a boss, the primary sealing area by the plane of spool upper end with The plane of boss abuts against to be formed.

Preferably, a kind of hydraulic tool, including the pump housing, the pump housing rear end are provided with the oil bag for storing hydraulic oil, The pump housing is interior to be equipped with the oil discharge passage for being connected to the oil inlet passage of oil bag and being connected to hydraulic cylinder, divides in oil inlet passage and oil discharge passage In line check valve and oil outlet one-way valve are not installed, in line check valve or/and oil outlet one-way valve are for the unidirectional of hydraulic tool The check valve installation end of valve, the oil inlet passage or oil discharge passage is equipped with tapped valve opening, and the valve seat of the check valve is logical It crosses and is threaded in the valve opening, when valve seat screws, the plane that the boss is connected to spool upper end forms sealing, described Valve opening bottom surface is equipped with the second tapered surface compatible with the first tapered surface of valve body, and under the action of valve seat, the valve body passes through O Type sealing ring is sealed on the second tapered surface；Working chamber is offered in the pump housing, oil inlet passage is connected to work with oil discharge passage Chamber, the working chamber is interior to be equipped with the pump core component moved back and forth；Be equipped with hydraulic cylinder in the pump housing, the hydraulic cylinder and oil bag it Between be equipped with drain path, drain path be equipped with a relief valve, the pump housing lower end is connected with for controlling relief valve and motor The regulation handle of opening and closing, the pump housing lower section are additionally provided with the pressing mechanism in the hydraulic oil indentation hydraulic cylinder in oil bag, pressurization Mechanism includes the motor that the pump core component being installed in working chamber and transfer tube core assembly pump.

Preferably, filter is provided between the in line check valve and oil bag.

Compared with the prior art, the utility model has prominent and beneficial technical effects that:

1. the shape by changing spool, uses flat seal, in addition reducing the two between spool and valve body Between sealing contact surface so that its sealing performance greatly promotes, prevent during the work time check valve there are the feelings of reversed oil return Condition occurs, so that its reliability greatly improves, in addition the weight of spool itself reduces, the lighter overall weight of check valve makes The fiting effect for obtaining spool and spring more optimizes, and improves its working efficiency in spool opening and closing.

2. hydraulically-controlled one-way valve is by matching the diameter of section size of the diameter of spool and ontology inner via hole Mode to carry out spool radial limit, and spool is moved along body axis direction always, ensure that spool movement Stability improves the stability of check valve, reduces vibration and noise, the recirculation hole there are six even layings on valve body end face, It neither influences to limit the radial direction of spool, and liquid medium can be made to pass through flow-conveying groove and quickly through overcurrent speed is fast.

3. the spool upper end increases preformed hole, can directly be gone down with 118 ° of drill bit brill for machining Straight forming, to guarantee bottom finish: simplifying processing technology, reduce difficulty of processing when manufacture.

4. compared with prior art, pervious valve body lower end is close to the mounting structure of fuel-displaced valve opening using plane adaptation Sealing uses the conical surface now, O-ring seal is added on the conical surface, so that leakproofness improves again, and in machine-building tolerance Play the role of a prevention, in general always it cannot be guaranteed that no error, always has several errors, setting is oblique O-ring seal on face is in order to overcome this inherently existing error, in order not to allow body base to be directly against hydraulic pump Close to bottom outlet face on, avoid under long-term work it is possible that abrasion, card resistance, be broken the problems such as, from the angle of long-time service From the point of view of the improvement of the sealing structure substantially increase service life, along with O-ring seal improves anti-loosening property and close simultaneously Sealing property.

5. what compared with prior art, the hydraulically-controlled one-way valve screw-fashion of former Electric hydraulic tool generallyd use is careless It opens one and screws slot, screwed now using interior hexagonal, got a promotion so that screwing power, after screwing power promotion, itself Leakproofness just gets a promotion, so that product is relatively reliable when in use.

6. the utility model proposes hydraulic tool it is compact-sized, be used cooperatively above-mentioned check valve, simplify processing technology, add Work is high-efficient, further decreases manufacturing cost.

Detailed description of the invention

Fig. 1 is the cross-sectional view of the utility model in line check valve；

Partial enlarged view at Fig. 2 Figure 1B；

Fig. 3 is the explosive view of the utility model in line check valve；

Fig. 4 is the structure diagram of the utility model in line check valve；

Fig. 5 is the partial sectional view of the utility model hydraulic tool；

Fig. 6 is the partial enlarged view at Fig. 5 A；

Fig. 7 is the cross-sectional view of the utility model oil outlet one-way valve；

Fig. 8 is the explosive view of the utility model oil outlet one-way valve；

Fig. 9 is the structure diagram of the utility model in line check valve.

In figure: 2- oil inlet passage；3- oil discharge passage；4- hydraulic cylinder；5- pressing mechanism；6- motor；The fuel-displaced valve body of 7-；8- goes out Oil valve seat；9- oil outlet；11- through-hole；12- working chamber；14- boss；15- flowing hole；17- valve opening；19- inner sidewall；20-O type Sealing ring；The 21- pump housing；23- valve seat；24- spool；25- spring；26- oil inlet valve body；27- primary sealing area；Hexagonal screwing in 28- Tight slot；29- hydraulic end；30- regulation handle；31- pump core component；32- oil bag；34- filter；35- mounting groove；36- is led Xiang Zhu；37- axial hole；The first tapered surface of 38-；The second tapered surface of 39-；40- piston rod；41- piston spring；42- centrifuging bearing Seat.

Specific embodiment

The utility model is described further with specific embodiment below.

Embodiment one: as shown in Figs 1-4, a kind of check valve, including be fixed in valve opening 17 valve seat 23, valve body 26, with And spool 24 and spring 25 between valve seat 23 and valve body 26 are set, the valve seat 23 opens up a through-hole 11, and spring 25 abuts Between spool 24 and valve body 26,23 lower end surface of valve seat is convexly equipped with a boss 14, under the elastic force effect of the spring 25, The plane of 24 upper end of spool can lean with the plane of the boss 14 and form primary sealing area 27, and the valve body 26 is opened Equipped with inner sidewall 19 compatible with 24 shape size of spool, its described inner sidewall 19 can carry out radial limit and be made to spool 24 The spool 24 can be moved along its axis direction always, and 23 bottom end of valve seat opens up a through-hole 11, and 26 bottom end of valve body is equal Several flowing holes 15 are furnished with, flowing hole 15 is connected to through-hole 11, and the hydraulic oil in the through-hole 11 is flowed out by flowing hole 15.

The spool 24 is changed instead of the ball support in background technique, steel ball, retaining ring, the structure of the spool 24 itself Become, the design of its structure reduces the self weight of spool in contrast；The design of the primary sealing area 27 is so that spool 24 and valve body Flat seal is formed under the action of the elastic force of above-mentioned spring 25 between 26, because the reason of flat seal, so as to spring bullet The requirement of power substantially reduces, in addition the weight of spool itself is reduced along with the structure of spool uses plane so that spool and Spring fiting effect more optimizes, because the frequency of the cooperative movement of the spring and spool of the check valve on hydraulic tool is very It is high, the design so that spool itself weight, its work can be naturally greatly improved when Open-close sealing Make efficiency.

This hydraulically-controlled one-way valve carries out diameter to spool in such a way that spool matches with clear size of opening in inlet valve body To limit, so that spool is only capable of moving along axis direction, without radial movement occurs in the use process of check valve, The movement of spool is relatively stable, sensitivity and high reliablity, is able to satisfy at present for check valve stability, sensitivity and reliability Requirement, also improve the stability that check valve uses, reduce vibration and noise；In order to preferably process and in setting spool 24 upper surfaces have also opened up a directional hole.

Preferably, 26 bottom surface of valve body is the first tapered surface 38, and 26 lower end surface of oil inlet valve body is equally also provided with into The compatible inclined-plane in 17 bottom surface of valve opening, 26 lower end surface of oil inlet valve body to take the form of inclined plane be equipped with sealing ring mounting groove, it is described into O-ring seal 20 and O-ring seal mounting groove are additionally provided with below oil valve body 26, O-ring seal 20 is installed on O-ring seal installation In slot, the oil inlet valve body 26 is extruded in the inlet valve on the conical surface of 17 inner wall of valve opening and to take the form of inclined plane by O-ring seal 20 Sealing is formed between 26 lower end surface of body.

By at this 26 lower end surface of oil inlet valve body and 17 bottom surface of valve opening be arranged to compatible inclined-plane, and one is added between O-ring seal 20, avoid under long-term work it is possible that abrasion, card resistance, fracture the problems such as, from the angle of long-time service come It sees, design substantially increases service life, and on its conical surface plus O-ring seal 20 improves leakproofness again, in valve seat 23 Under the action of, the valve body 26 is sealed on the second tapered surface 39 by O-ring seal 20, and is risen in machine-building tolerance The effect prevented to one, in general always it cannot be guaranteed that no error, always has several errors, setting is first O-ring seal 20 on tapered surface 38 is and to improve whole locking property to overcome this inherently existing error Energy and sealing performance.

Preferably, mounting groove 35 compatible with 25 outer diameter size of spring is offered in the valve body 26, under mounting groove 35 Side offers axial hole 37, and the plane of 24 lower end of spool is convexly equipped with the guide post 36 being installed in spring 25, the spring 25 are connected in guide post 36 and mounting groove 35, and the guide post 36 of the spool 24 is by overcoming the elastic force of spring 25 to be depressed into axis To at 37 position of hole, the design of the axial hole 37 can have the space of adaptation, improve to valve so that when guide post 36 is too long The adaptability of core design.

Preferably, 26 bottom end of oil inlet valve body is uniformly distributed there are six fuel-displaced flowing hole 15 is used for, and further includes being set to oil inlet The preset hole of the installation spring 25 of 26 bottom center of valve body, preset hole similarly can be used for fuel-displaced.

Preferably, interior hexagonal is offered on the oil inlet valve seat 23 and screw slot 28, screwed using interior hexagonal, so that rotation Clamp force gets a promotion, and after screwing power promotion, the leakproofness of itself just gets a promotion, so that product itself is more safe and reliable.

The working principle of in line check valve: oil liquid is entered in oil inlet valve seat 23 by valve opening 17, and spool 24 is opened, described Oil liquid in through-hole is flowed out by flowing hole 15.

A kind of hydraulic tool being equipped with above-mentioned check valve, as seen in figs. 5-6, including the pump housing 21, the pump housing 21 are plunger Pump, the oil discharge passage 3 pump housing 21 the interior oil inlet passage 2 for being equipped with connection oil bag 32 and be connected to hydraulic cylinder 4,2 He of oil inlet passage In line check valve and oil outlet one-way valve, the check valve of the oil inlet passage 2 or oil discharge passage 3 are separately installed in oil discharge passage 3 Installation end is equipped with tapped valve opening 17, and the valve seat 23 of the check valve is threadedly attached in the valve opening 17, in valve When seat 23 screws, the plane that the boss 14 is connected to 24 upper end of spool forms sealing, is equipped with check valve in valve opening 17, described Offer working chamber 12 in the pump housing 21, oil inlet passage 2 is connected to working chamber 12 with oil discharge passage 3, be equipped in the working chamber 12 by Regulation handle 30 drives the pump core component 31 to move back and forth, and pump core component 31 is connected to check valve；Tool in the pump housing 21 There is hydraulic cylinder 4,21 rear end of the pump housing is provided with the oil bag 32 for storing hydraulic oil, between the hydraulic cylinder 4 and oil bag 32 It is connected by oil circuit, drain path is equipped between the hydraulic cylinder 4 and oil bag 32, drain path is equipped with a relief valve, institute State 21 lower end of the pump housing and be connected with regulation handle 30 for controlling relief valve and motor opening and closing, be additionally provided with below the pump housing 21 by The pressing mechanism 5 in hydraulic oil indentation hydraulic cylinder 4 in oil bag 32, pressing mechanism 5 includes the pump core being installed in working chamber 12 The motor 6 that component 31 and transfer tube core assembly 31 pump, pump core component 31 include that piston rod 40 and setting exist The piston spring 41 of 40 top of piston rod has piston rod 40 always and moves up and down under the action of 41 elastic force of piston spring Trend, centrifuging bearing seat 42 is equipped with below the piston rod 40, when Electric hydraulic tool at work, drive regulation handle 30 The motor 6 of pressing mechanism 5 and power supply are connected, make 42 Work Promote piston rod 40 of centrifuging bearing seat, so that power oil is pressed into Into the cavity of hydraulic cylinder 4.

Offer working chamber 12 in the pump housing 21, the oil outlet of the oil inlet of above-mentioned oil inlet passage 2 and oil discharge passage 3 with Working chamber 12 is connected.

A kind of variable displacement plunger pump [application number disclosed in Chinese patent literature data can be used in plunger pump 201220146314.9；Authorization Notice No.: CN202612062U], other hydraulic pumps can also be used.

Preferably, the inlet end and an outlet end of the oil circuit all has check valve, makes hydraulic oil by oil bag by check valve 32 enter in the hydraulic cylinder 4.So that hydraulic oil is entered hydraulic cylinder 4 from oil bag 32 always by the way that check valve is arranged, prevents liquid Pressure oil reflux, strengthens pressure holding effect.

4 side of hydraulic cylinder is equipped with hydraulic end 29, and hydraulic end 29 is card pressure head, hydraulic end 29 and liquid The piston rod 40 of cylinder pressure 4 is fixedly connected with, and spring is equipped between the cylinder body and piston rod 40 of oil cylinder to be made under the effect of spring force Piston rod has the trend of past oil cylinder medial movement always.

Preferably, it is provided with filter 34 between the in line check valve and oil bag 32, is to prevent sundries foreign matter from entering pump Body 21 generates blocking.

Working principle: by regulation handle 30 press when, by motor 6 drive pump core component 31 work, pump core component 31 to On take up, sealed volume in working chamber 12 increases, and pressure reduces, and the hydraulic oil in oil bag 32 flows into oil inlet passage 2, and will be into Spool in the in line check valve of oil port opens, and oil liquid will by oil inlet passage 2 to working chamber 12, unclamping regulation handle 30 Pump core component 31 takes up downwards, and the sealed volume in working chamber 12 is reduced, and the oil liquid in working chamber 12 is squeezed pump core component 31 It depresses and collects to oil discharge passage 3, the spool in the oil outlet one-way valve of oil outlet is opened and enters oil outlet one-way valve by oil liquid Flow channel is flowed into hydraulic cylinder 4 along flowing hole, drives hydraulic end 29 to move by hydraulic cylinder 4.

Embodiment two: the present embodiment and embodiment one are almost the same, the difference lies in that as illustrated in figs. 5-7, the present embodiment In hydraulically-controlled one-way valve be used for pump core component 31 fuel-displaced place, the oil outlet one-way valve being set in oil discharge passage 3 include Oil valve body 7 and delivery valve seat 8, the delivery valve seat 8 is interior to be equipped with oil outlet 9, as shown in fig. 7,8 upper surface of the delivery valve seat is in Inclined surface, O-ring seal 20 is installed on inclined surface, and delivery valve seat 8 is extruded in fuel-displaced valve opening inner wall cone by O-ring seal 20 On face formed sealing, the sealing at this be in order to prevent oil liquid from oil outlet 9 pour generation leakage.The oil liquid passes through oil outlet 9 enter in delivery valve seat 8, and spool 24 is opened, and the oil liquid enters flow channel 18, flow out along flowing hole 15.

Above-described embodiment is only the preferred embodiment of the utility model, not limits the protection model of the utility model according to this It encloses, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by the protection of the utility model Within the scope of.

Claims (8)

1. a kind of check valve for hydraulic tool, it is characterised in that: including valve seat (23), the valve body being fixed in valve opening (17) (26) and spool (24) and spring (25) between valve seat (23) and valve body (26) is set, the valve seat (23) opens up one Through-hole (11), the spring (25) are connected between spool (24) and valve body (26), under the elastic force effect of the spring (25), The plane of spool (24) upper end can lean with the valve seat (23) lower end surface and form primary sealing area (27)；

Valve body (26) bottom end is evenly equipped with several flowing holes (15), when spool (24) upper surface and valve seat (23) lower end surface point From when, flowing hole (15) is connected to through-hole (11), the medium in the through-hole (11) pass through flowing hole (15) flow out.

2. a kind of check valve for hydraulic tool according to claim 1, it is characterised in that: opened in the valve body (26) Equipped with inner sidewall (19) compatible with spool (24) shape size, the inner sidewall (19) carries out radial limit to spool (24) It and move the spool (24) can along its axis direction always.

3. a kind of check valve for hydraulic tool according to claim 1, it is characterised in that: spool (24) lower end Plane be convexly equipped with the guide post (36) being installed in spring (25), offered in the valve body (26) big with spring (25) outer diameter Small compatible mounting groove (35), the spring (25) are connected in guide post (36) and mounting groove (35).

4. a kind of check valve for hydraulic tool according to claim 1 or 2 or 3, it is characterised in that: the valve body (26) bottom surface is the first tapered surface (38), is installed on O-ring seal (20) on first tapered surface (38).

5. a kind of check valve for hydraulic tool according to claim 4, it is characterised in that: valve seat (23) upper end It offers interior hexagonal to screw slot (28), the outer spiral shell for being fixed on valve opening (17) upper inner wall is equipped on the outside of the valve seat (23) Line.

6. a kind of check valve for hydraulic tool according to claim 5, it is characterised in that: valve seat (23) lower end Face is convexly equipped with a boss (14), and the primary sealing area (27) passes through the plane and the plane phase of boss (14) of spool (24) upper end It abuts and is formed.

7. a kind of hydraulic tool, including the pump housing (21), it is characterised in that: the pump housing (21) rear end is provided with hydraulic for storing The oil bag (32) of oil, be equipped in the pump housing (21) oil inlet passage (2) of connection oil bag (32) be connected to the fuel-displaced of hydraulic cylinder (4) In line check valve and oil outlet one-way valve, in line check valve are separately installed in channel (3), oil inlet passage (2) and oil discharge passage (3) Or/and oil outlet one-way valve is the check valve described in any one of claims 1-6 for hydraulic tool, the oil inlet passage (2) Or the check valve installation end of oil discharge passage (3) is equipped with tapped valve opening (17), the valve seat (23) of the check valve passes through spiral shell Line is connected in the valve opening (17), and when valve seat (23) screws, the plane that boss (14) is connected to spool (24) upper end is formed Sealing, valve opening (17) bottom surface are equipped with the first tapered surface (38) of valve body (26) compatible second tapered surface (39), Under the action of valve seat (23), the valve body (26) is sealed on the second tapered surface (39) by O-ring seal (20)；

It is offered working chamber (12) in the pump housing (21), oil inlet passage (2) is connected to working chamber (12), institute with oil discharge passage (3) State the pump core component (31) for being equipped with and moving back and forth in working chamber (12)；Hydraulic cylinder (4) are equipped in the pump housing (21), it is described hydraulic Drain path is equipped between cylinder (4) and oil bag (32), drain path is equipped with a relief valve, and the pump housing (21) lower end is connected with For controlling the regulation handle (30) of relief valve and motor opening and closing, it is additionally provided with below the pump housing (21) by the liquid in oil bag (32) Pressure oil is pressed into the pressing mechanism (5) in hydraulic cylinder (4), and pressing mechanism (5) includes the pump core component being installed in working chamber (12) (31) and the motor (6) that pumps of transfer tube core assembly (31).

8. a kind of hydraulic tool according to claim 7, it is characterised in that: between the in line check valve and oil bag (32) It is provided with filter (34).