CN208503132U - Overflow valve - Google Patents

Abstract

The utility model provides a kind of overflow valve, the overflow valve includes overflow valve body, overflow inlet on overflow valve body, overflow outlet, set on the intracorporal overflow spool of the overflow valve, overflow valve spring, overflow piston, one end of the overflow spool connects the overflow valve spring, the other end of the overflow spool connects the overflow piston, channel between overflow inlet described in the overflow seal spool and overflow outlet, when the oil pressure in oil input channel is greater than certain value, it squeezes the overflow spool and opens the channel between the overflow inlet and overflow outlet, when the overflow spool is gradually opened the channel between the overflow inlet and overflow outlet, the overflow piston gradually seals the overflow inlet.The utility model can close overflow valve when fluid pressure is excessive.

Description

Overflow valve

Technical field

The utility model relates to a kind of overflow valve more particularly to a kind of overflow valves that the channel applied to hydraulic valve controls.

Background technique

This part intends to provides for the utility model embodiment stated in claim and its in specific embodiment Background or context, the content of description herein recognize it is the prior art not because not being included in this part.

A kind of hydraulic pressure control valve of overflow valve, mainly plays level pressure overflow, pressure stabilizing, system unloaded and peace in hydraulic device Full guard effect.Current overflow valve can be always maintained at the state of overflow valve opening, cause hydraulic when fluid pressure is excessive It is difficult to control.

Utility model content

In consideration of it, it is necessary to provide a kind of overflow valve, when fluid pressure is excessive, overflow valve can be closed.

The utility model provides a kind of overflow valve, and the overflow valve includes overflow valve body, the overflow on overflow valve body Import, is set to the intracorporal overflow spool of the overflow valve, overflow valve spring, overflow piston at overflow outlet, the overflow spool One end connects the overflow valve spring, and the other end of the overflow spool connects the overflow piston, the overflow seal spool Channel between the overflow inlet and overflow outlet squeezes described overflow when the oil pressure in oil input channel is greater than certain value Flow valve core and open the overflow inlet and the overflow outlet between channel, when the overflow spool be gradually opened it is described overflow When flowing into the channel between mouth and overflow outlet, the overflow piston gradually seals the overflow inlet.

Further, the overflow spool includes cone valve and spring fastenings, and the tapered end connection of the cone valve is described to overflow Piston is flowed, the bottom end of the cone valve connects the spring fastenings, and the spring fastenings connect the overflow valve spring.

Further, the overflow valve body have the first wasteway and the second wasteway, first wasteway with it is described The connection of second wasteway, the diameter of first wasteway are less than the diameter of second wasteway, and the overflow inlet is set to On the side wall of first wasteway, the overflow outlet is set on the side wall of second wasteway.

Further, the overflow valve body includes the first overflow part and the second overflow part, the outer diameter of first overflow part Less than the outer diameter of second overflow part, the overflow inlet is set in first overflow part, and the overflow outlet is set to institute On the side wall for stating the second overflow part.

Further, the overflow valve further includes spring adjustor, and the spring adjustor connects the overflow valve spring, For adjusting the pressing force of the overflow valve spring.

Further, the spring adjustor includes nut and adjusting screw, and the nut is fixed on the overflow valve On body, the end of the adjusting screw connects the overflow valve spring and connect with the nut thread.

Further, the spring adjustor further includes overflow sealing ring, and the overflow sealing ring connects the adjusting spiral shell The end of silk is simultaneously contacted with the bore seal of the overflow valve body, and the end of the overflow valve spring connects the overflow sealing Circle.

It compared to the prior art, can the utility model has the beneficial effects that the utility model is when fluid pressure is excessive Close overflow valve.

Detailed description of the invention

In order to illustrate more clearly of the utility model embodiment technical solution, will make below to required in embodiment description Attached drawing is briefly described, it should be appreciated that the accompanying drawings in the following description is some embodiments of the utility model, right For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings His attached drawing.

Fig. 1 is the decomposition diagram of hydraulic valve.

Fig. 2 is one of the structural schematic diagram of valve body and hydraulic tappet cooperation.

Fig. 3 is one of oil cylinder oil inlet status diagram.

Fig. 4 is the second structural representation of valve body and hydraulic tappet cooperation.

Fig. 5 is one of oil cylinder oil inlet status diagram.

Fig. 6 is the third structural representation of valve body and hydraulic tappet cooperation.

Fig. 7 is the structural schematic diagram of overflow valve.

Fig. 8 is the structural schematic diagram of operating-controlling mechanism.

Fig. 9 is enlarged drawing at the A of Fig. 8.

Figure 10 is the structural schematic diagram of resetting-mechanism.

Figure 11 is enlarged drawing at the A of Figure 10.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment is obtained, the protection scope of the utility model is belonged to.It is understood that attached drawing is provided solely for referring to With illustrate to use, not be used to the utility model is limited.The connection relationship shown in attached drawing is intended merely to facilitate clearly Description, does not limit connection type.

It should be noted that it can be directly to when a component is considered as " connection " another component Another component, or may be simultaneously present component placed in the middle.Unless otherwise defined, all technology and science used herein Term has the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs.It should also be noted that, removing Non- separately to have specific regulation and limit, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixed connect It connects, may be a detachable connection, or be integrally connected；It can be mechanical connection, be also possible to be electrically connected, can be two members Connection inside part.For the ordinary skill in the art, it can understand that above-mentioned term is practical new at this with concrete condition Concrete meaning in type.Terminology used in the description of the utility model herein is intended merely to describe specifically to implement The purpose of example, it is not intended that in limitation the utility model.

It should also be noted that, the utility model description in, it should be noted that term " center ", "upper", "lower", The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "inner", "outside" be orientation based on the figure or Positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or member of indication or suggestion meaning Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention. In addition, term " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

Referring to Fig. 1, Fig. 1 is the decomposition diagram of the hydraulic valve of an embodiment of the utility model.The hydraulic valve 100 include control device 10, hydraulic tappet 20, valve body 30 and resetting apparatus 40, and the control device 10 is fixed on the valve The side of body 30, the other side that the resetting apparatus 40 is fixed on the valve body 30 is opposite with the control device 10, in order to just In understanding, the side of the connection control device 10 of the valve body 30 is defined as upper end by the utility model, by the valve body The side of the 30 connection resetting apparatus 40 is defined as lower end.

It please refers to and is equipped with vertical slideway 31 corresponding with hydraulic tappet 20, the hydraulic tappet 20 in valve body 30 described in Fig. 2 It being placed in the slideway 31, the hydraulic tappet 20 can move up and down under the action of control device 10 along the slideway, Slideway 31 penetrates through the upper and lower ends of the valve body 30, and the upper end of the hydraulic tappet 20 connects the control device 10, institute The lower end for stating hydraulic tappet 20 connects the resetting apparatus 40.

Wherein, the control device 10 and hydraulic tappet 20 connect, and may make up the operating-controlling mechanism of the hydraulic valve 100, In, the hydraulic tappet 20 and the resetting apparatus 40 connect, and may make up the resetting-mechanism of the hydraulic valve 100.

Also referring to Fig. 1, the slideway 31 is equipped with the first oil outlet 311 and the second oil outlet 312 being spaced apart from each other, Also, first oil outlet 311 close to the slideway 31 upper end opening 313 and have with the upper end opening 313 certain Distance, second oil outlet 312 close to the slideway 31 lower ending opening 314 and have with the lower ending opening 314 certain Distance.

Wherein, as shown in figure 3, first oil outlet 311 and second oil outlet 312 can be respectively communicated with oil cylinder 200 Oil pocket A and B, when hydraulic oil enters in the oil pocket A of oil cylinder 200 from the first oil outlet 311, push oil cylinder 200 in work Plug moves downward, and when hydraulic oil enters in the oil pocket B of oil cylinder 200 from the second oil outlet 312, pushes the work in oil cylinder 200 Plug moves upwards.

It should be understood that the hydraulic valve 100 of the utility model can be a hydraulic valve, bigeminy hydraulic valve, even more Multi-joint hydraulic valve, wherein connection number represents the quantity of hydraulic valve actuator port, each each actuator port includes one first Oil outlet 311 and one second oil outlet 312 indicate actuator port there are two the bigeminy hydraulic valve tools when for bigeminy hydraulic valve, When for tetrad hydraulic valve, tetrad hydraulic valve tool is indicated there are four actuator port, Fig. 1 show tetrad hydraulic valve.

Please continue to refer to Fig. 1 and Fig. 2, it is equipped with oil input channel 32 in the valve body 30, oil inlet is equipped on the valve body 30 33, the oil inlet 33 is connected to oil input channel 32, and the hydraulic oil in fuel tank can be drained into the oil input channel 32 by the oil inlet 33 In, the oil input channel 32 can be connected to each every one first oil outlet 311 and every one second oil outlet 312, to make oil Hydraulic oil in case is drained into each each oil outlet 311 and every one second oil outlet 312, and then enters each institute In two oil pockets of the oil cylinder 200 of connection.

Wherein, the oil inlet 33 can be set multiple, and each oil inlet 33 can connect with the oil input channel 32 Logical, oil inlet 33 can be distributed in the different location of the different sides of the valve body 30, or can be distributed in same side Same position can facilitate oil inlet 33 to connect fuel tank, meet the needs of different situations, can select one of oil inlet 33 Fuel tank is connected, remaining oil inlet 33 can then be blocked by plug.

The oil input channel 32 forms triple channel 301 with slideway 31, and it is the triple channel 301 that oil input channel 32 and slideway, which connect 31 logical places, Import 302, wherein first oil outlet 311 is located at the upside of the import 302, and second oil outlet 312 is located at institute State the downside of import 302.

The upper and lower ends of the hydraulic tappet 20 are respectively arranged with first end piston 21 and second end piston 22, can design The height of the first end piston 21 and the height of the second end piston 22 are larger, thus make the hydraulic tappet 20 along When the slideway 31 slides up and down, the first end piston 21 is to seal the upper end opening 313 always, and the second end Piston 22 is to seal the lower ending opening 314 always, so that hydraulic oil be avoided to open from the upper end opening 313 and the lower end The 314 discharge valve bodies 30 of mouth.

First is equipped between the first end piston 21 and the second end piston 22 in the hydraulic tappet 20 Piston 23, wherein the first piston 23 is corresponding with the position of the triple channel 301, glides when on the hydraulic tappet 20 When dynamic, the first piston 23 can slide up and down in the slideway 31, to seal the different location of the cunning 31.

Fig. 2 and Fig. 3 are please referred to, when 20 slide downward of hydraulic tappet, the first piston 23 then seals the import 302 With the channel between second oil outlet 312, at this point, the hydraulic oil entered in valve body 30 from fuel tank is then discharged into first Hydraulic fluid port 311, and then be discharged into oil pocket A, piston moves downward for promotion, and hydraulic oil cannot enter in oil pocket B；Such as Fig. 4 and Fig. 5 Shown, when 20 upward sliding of hydraulic tappet, the first piston 23 seals import 302 and the institute of the triple channel 301 The channel between the first oil outlet 311 is stated, at this point, the hydraulic oil entered in valve body 30 from fuel tank is then discharged into the second oil outlet 312, into being discharged into oil pocket B, piston upwards are pushed, hydraulic oil cannot enter in oil pocket A.

It is understood that for convenience in hydraulic oil in the case where not entering oil pocket A and oil pocket B, it can be from described The convenience being discharged in valve body, oil return opening 34 can be arranged on valve body 30, oil return is arranged in valve body 30 as shown in figures 1 to 6 Channel 35, hydraulic oil can be from 34 exits valve body 30 of oil return opening.It can be realized for convenience in by a hydraulic tappet 20 Hydraulic oil is being discharged from first oil outlet 311 discharge, from second oil outlet 312 and is being discharged from the oil return opening 34 The control back and forth of three kinds of states can allow the drainback passage 34 to cross with the slideway 31, increase on the hydraulic tappet 20 Add piston, and controls whether each piston on hydraulic tappet 20 blocks river conjunction to realize the logical of opening/closing oil return opening and oil inlet Road.

In present embodiment, as shown in fig. 6, the drainback passage 35 includes that the first drainback passage 351 and the second oil return are logical Road 352, wherein the left side of the slideway 31 is arranged in first drainback passage 351, and both ends are connected to the oil inlet 33 and institute State slideway 31, second drainback passage 352 is arranged in the right side of the slideway 31, and both ends are connected to the slideway 31 and described Oil return opening 34, wherein first communication port 3511 and second drainback passage 352 of first drainback passage 351 with the slideway 31 It can be with the second communication port 3521 of the slideway 31 and to be staggered, in present embodiment, first communication port 3511 can position Slightly above in second communication port 3521.

It is understood that first communication port 3511 and second communication port 3521 not may be positioned only at described The lower section of two oil outlets 312, first communication port 3511 and second communication port 3521 can also be positioned at described first The top of oil outlet 311, present embodiment are located at described the with first communication port 3511 and second communication port 3521 Two oil outlets is illustrated for 312 lower section.

It is equipped at intervals with second piston 24 and third piston on the hydraulic tappet 20, wherein third piston and described second Holding piston 22 can be same piston, by designing the height of second end piston 22, second end piston 22 can be allowed both to have reached sealing The effect of lower ending opening 314, and realize and seal the slideway 31 and hydraulic oil is blocked to enter second drainback passage 352.Institute The lower section that second piston 24 is located at the top of the third piston 25 and is located at the first piston 23 is stated, according to the first oil outlet 311 at a distance from the first communication port 3511, the second oil outlet 312 is at a distance from the first communication port 3521, the first communication port 3511 At a distance from the second communication port 3521, height, the design first piston 23 and the institute of second piston 24 can be correspondingly designed The distance between second piston 24, design the distance between the first piston 23 and the third piston are stated, is come so that working as liquid It presses tappet 20 in sliding, adjusts the sealing situation of the slideway 31 everywhere.

Can be together refering to Fig. 2, Fig. 4, Fig. 6, when being in original state, hydraulic oil does not enter actuator port, and described first Piston 23 seals the oil input channel 32 and first oil outlet 311 and the channel between second oil outlet 312, the Two pistons 24 seal the channel between the oil inlet 33 and second oil outlet 312 always, thus from institute when avoiding oil return It states slideway 31 to enter in the second oil outlet 312, the first drainback passage 351 described in second piston 24 and third piston blow-by And the second channel between drainback passage 352 so that hydraulic oil can from the oil inlet 33 by the valve body 30 from described time Hydraulic fluid port 34 is expelled in fuel tank；When pushing the hydraulic tappet 20, the first piston 23 seals the oil input channel 32 and institute The channel between the second oil outlet 312 is stated, at this point, the second piston 24 seals the slideway 31 and block hydraulic oil simultaneously Enter second drainback passage 352 from first drainback passage 351, to avoid hydraulic oil from 34 exits valve body of oil return opening 30, guarantee that hydraulic oil enters in oil pocket A；When being lifted the hydraulic tappet 20, the first piston 23 seals the oil inlet Channel between road 32 and first oil outlet 311, at this point, the third piston 24 seals the slideway 31 and blocks hydraulic Oil enters second drainback passage 352 from first drainback passage 351, to avoid hydraulic oil from 34 dump valve of oil return opening Body 30 guarantees that hydraulic oil enters in oil pocket B.

As shown in fig. 6, the hydraulic valve 100 further includes check valve 60, the valve body 30 is equipped with unidirectional valve opening 39, described Check valve 60 is set in the unidirectional valve opening 39, and check valve 60 extends in oil input channel, and the check valve 60 includes check valve body 61, nonreturn valve core

62 and spring 63, the check valve body 61 be fixed in the unidirectional valve opening 61, the salable institute of check valve body 61 State unidirectional valve opening 61, hydraulic oil avoided to leak from unidirectional valve opening 61,63 both ends of spring connect the check valve body 61 with The nonreturn valve core 62, the nonreturn valve core 62 seal the oil input channel 32, when oil pressure is greater than certain value, the nonreturn valve core 62 open the oil input channel 32.

As shown in fig. 6, the first oil expulsion channel 36 and the second oil expulsion channel 37 are additionally provided in the valve body 30, first oil expulsion channel 36 can be connected on the slideway 31 with second oil expulsion channel 37, first oil expulsion channel 36 and 31 connectivity part of slideway For third connecting mouth 361, second oil expulsion channel 37 is the 4th communication port 371 with 31 connectivity parts of the sliding, and wherein third connects Port 361 is at the position of first oil outlet 311, such as can be the summary upper end in the first oil outlet 311 or summary Lower end or in side, the 4th communication port 371, such as can be fuel-displaced second at the position of second oil outlet 312 Mouthfuls 312 summary upper end or slightly lower end or in side.

It is described when the first piston 23 opens the channel between the oil input channel 32 and first oil outlet 311 First piston 23 opens simultaneously first oil expulsion channel 37, and excess enthalpy for not being entered oil pocket A by first oil expulsion channel 37 In hydraulic oil discharge, when the first piston 23 opens the channel between the oil input channel 32 and the second oil outlet 312, The second piston 24 opens simultaneously the channel between the second oil expulsion channel 37, second oil expulsion channel 37 be used for excess enthalpy and not The hydraulic oil discharge in oil pocket B is entered, hydraulic control is so convenient for.

It is understood that when the first oil outlet 311 misplaces with third connecting mouth 361 and/or the second oil outlet 312 with It, can be by designing the height of first end piston 21 and the height of second piston 24, Huo Zhe when 4th communication port 371 misplaces Piston is added on hydraulic tappet 20, hydraulic tappet 20 can be made in sliding, the first oil outlet of piston seal 311 while is close Third connecting mouth 361 is sealed, the 4th communication port 371 is sealed while the second oil outlet of piston seal 312.

In one embodiment, as shown in figures 1 to 6, the hydraulic valve 100 can also include overflow valve 50, described Overflow ducts 38 are additionally provided on valve body 30, the overflow valve 50 is set in the overflow ducts 38, and the overflow ducts 38 are connected to The oil inlet 33, wherein the overflow ducts 38 can be connected to fuel tank, when the oil pressure in oil input channel 32 is greater than certain value, energy The overflow valve 50 is enough opened, is flowed back into fuel tank so that hydraulic oil be made to be discharged out of valve body 30, well in regulation valve body 30 Oil pressure, guarantee oil pressure be in stationary value.

In present embodiment, as shown in fig. 7, the overflow valve 50 includes overflow valve body 51, on overflow valve body 51 Overflow inlet 511 and overflow outlet 512, overflow spool 52 and overflow valve spring 53, overflow valve body 51 is interior to have wasteway 501, The overflow spool 52 and the overflow valve spring 53 can be set in the wasteway 501, and the overflow inlet 512 can be set to institute It states and is connected at the end position of overflow valve body 51 with the wasteway 501, and overflow outlet 512 can be set to the overflow valve The middle position of body 51 is connected to the wasteway 501, and one end of the overflow spool 52 connects the overflow valve spring 53, Overflow valve spring 53 is attached in overflow valve body 51, oil pressure be less than certain value when, overflow spool 52 be located at the overflow into Between mouth 511 and overflow outlet 512, wasteway 501 is sealed, when oil pressure is greater than certain value, oil pressure gives overflow spool 52 certain pressure, force the overflow spool 52 to overcome the elastic force of overflow valve spring 53, and open overflow inlet 511 and described Wasteway 501 between overflow outlet 512, in this way, the wasteway 501 can be opened and closed when the overflow spool 52 moves.

The overflow valve 50 can also include overflow piston 53, and wherein overflow piston 53 is connected to the one of overflow spool 42 End can design the length of overflow spool 52 so that when the overflow spool 52 is gradually opened the overflow inlet 511 and described When overflow exports the channel between 512, the overflow piston 53 gradually seals the overflow inlet 511.

It is understood that the wasteway 501 include the first wasteway 5011 and with first wasteway 5011 Second wasteway 5012 of connection, wherein the diameter of first wasteway 5011 is less than the straight of second wasteway 5012 Diameter, the overflow inlet 511 are set on the side wall of first wasteway 501, and the overflow outlet 512 is set to described second and overflows On the side wall of runner 5012, wherein the overflow spool 52 can be cone valve, and cone valve seals the first wasteway 5011 and second The connector of wasteway 5012.

Wherein, the bottom end of the cone valve can connect a spring fastenings 55, and the tapered end of cone valve then connects the overflow Piston 54 can connect the overflow valve spring 53 by spring fastenings 55, preferably make overflow valve spring 53 compression and Stretching, extension consolidates.

For convenience in the overflow and fixation of overflow valve 50, the overflow valve body 51 can be divided for the first overflow part 510 and second overflow part 520, the outer diameter of first overflow part 510 is less than the outer diameter of second overflow part 520, in overflow The outer surface of valve body 51 forms ladder, and the overflow inlet 511 is set in first overflow part 510, the overflow outlet 512 On the side wall of second overflow part 520, when in use, overflow valve 50 can be inserted into the overflow ducts of the valve body 30 In 38, being contacted by cascaded surface with the valve body 30 is located in overflow valve body 51 in overflow ducts 38, also, described first The end of overflow part 510 can be plugged into the valve body 30, is convenient to overflow inlet 511 and is directly protruding into valve body 30, is convenient for Hydraulic oil enters in overflow valve body 51 from the overflow inlet 511.

For convenience in the pressing force for adjusting the overflow valve spring 53, the overflow valve can also include spring adjustor 56, wherein the spring adjustor 56 connects the overflow valve spring 53.

In the present embodiment, the spring adjustor 56 may include nut 561, adjusting screw 562, overflow sealing ring 563, wherein the nut 561 is fixed on the outer end position of the overflow valve body 51, and the adjusting screw 562 then passes through institute The end for stating overflow valve body 51 enters in the overflow valve body 51 and is threadedly coupled with the nut 5561, overflow sealing ring 563 are connected to that end of the adjusting screw 562 being located in the overflow valve body 51, and the connection of 53 end of overflow valve spring is overflow Sealing ring 563 is flowed, overflow sealing ring 563 is contacted with the bore seal of overflow valve body 51, the inner cavity of the overflow valve body 51 is sealed, Hydraulic oil is avoided to be discharged from the screw hole of end.

Multiple sealing rings 57 can be set in the outside of the overflow valve body 51, for being fixed on the valve when overflow valve 50 When on body 40, the gap sealed between overflow valve 50 and overflow ducts 38 in the present embodiment can be in the second overflow part The 520 multiple sealing rings 57 of setting are, it can be achieved that stabilized seal.

As shown in figure 8, Fig. 8 is the structural schematic diagram of the operating-controlling mechanism, including control device 10 and hydraulic tappet 20, institute Stating control device 10 includes L shape shell 11 and control lever 12, and there are two orthogonal and be connected to for the L shape shell 11 tool Connecting cavity 111, two ends of the L shape shell 11 are respectively provided with an insertion hole 112, and the end of the control lever 12 is from one The insertion hole 112 is inserted into the L shape shell 11, and the end of the hydraulic tappet 20 is inserted into from another insertion hole 112 It is rotatablely connected in the L shape shell 11 and with the control lever 12, the control lever 12 passes through one turn at the position of connection Axis 13 is rotatably mounted in the L shape shell 11, and the shaft 13 is vertical with the hydraulic tappet 20.

As shown in figure 8, driving the connection of the control lever 12 when the outer power drive control lever 12 rotates counterclockwise The end of the hydraulic tappet 20 rotates counterclockwise together, so that the hydraulic tappet 20 moves downward, when outer power drive When control lever 12 rotates clockwise, the end of the connection hydraulic tappet 20 of the control lever 12 is driven to turn clockwise together It is dynamic, so that the hydraulic tappet 20 moves upwards.

In such a way that control lever 12 extends to side, manipulation of the user to control lever 12 may not only facilitate, and can subtract Height shared by small control lever 12, convenient for the installation of hydraulic valve 100.

As shown in figure 9, for the ease of the rotation connection of control lever 12 and the end of the hydraulic tappet 20, it can be in the liquid It presses the end of tappet 20 that one accommodating chamber 201 is set, and the end of the control lever 12 is made to be configured to spherical structure 121, it will be described Spherical structure 121 accommodates in the accommodating chamber 201, and when rotating the control lever 12, the spherical structure 121 is then in the receipts It is rotated in cavity 201.

It is understood that the accommodating chamber 201 can extend in the length direction perpendicular to hydraulic tappet 20, it is elongated Accommodating chamber, the length of the elongated accommodating chamber are greater than the diameter of the spherical structure 121, in this way, when rotating the control lever 12, The spherical structure 121 can move in elongated accommodating chamber, it is ensured that when control lever 12 drives hydraulic tappet 20 to move up and down, liquid Pressure tappet 20 is vertical movement, and hydraulic tappet 20 is avoided to squeeze 31 side wall of slideway of the valve body 30.

It is understood that the control device 10 can also include dust cover 14, dust cover 14 connects the L shape shell 11 end and the control lever 12, in the case where not influencing the rotation of control lever 12, sealing insertion hole 112 avoids dust Enter in L shape shell 11 and influence the manipulation of control lever 12.

Fixed ring 15,15 sets of the fixed ring are fixed with being inserted into the insertion hole 112 of L shape shell 11 for hydraulic tappet 20 In outside the first end piston 21 of the hydraulic tappet 20, by the fixed ring 15, the hydraulic tappet 20 can be made more reliable Ground vertical shift in the L shape shell 11；The control device 10 further includes sealing ring 16, and the sealing ring 16 is placed on institute State outside first end piston 21, the gap between the salable L shape shell 11 of sealing ring 16 and the valve body 30, avoid dust from It is entered in gap in valve body 30 or L shape shell 11, it is to be understood that the sealing ring 16 not only can be set on institute It states in fixed ring 15, can also be the outside set on the insertion hole 112, such as the upper end opening of the slideway 31 can be set to In 313, herein with no restrictions.

As shown in Figure 10 and Figure 11, the resetting apparatus 40 includes pedestal 41, reset spring 42, the first spring fixed ring 43, second spring fixed ring 44, connecting screw 45, the lower end that the connecting screw 45 can directly with the hydraulic tappet 20 Connection is recessed downwards the groove 411 of formation wherein the pedestal 41 has from the upper surface of the pedestal 41, the reset spring 42, the first spring fixed ring 43, the second spring fixed ring 44 are set in the groove 411, and the second spring is solid To determine ring 44 to be fixed in the pedestal 41, the lower end surface of second spring fixed ring 44 can be contradicted with the bottom surface of the groove 411, In, the second spring fixed ring 44 can be to be fixed in the pedestal 41 by the pressing force of reset spring 42, It can be and be fixed by screws in the pedestal 41.

The hydraulic tappet 20 can also be connect by connector 46 with the connecting screw 45.

The end of the connecting screw 45 can be protruded into the pedestal 41 from the opening of the groove 411, and the first spring is solid Determine the end that ring 43 is fixed on the hydraulic tappet 20, the reset spring 42 is set to the first spring fixed ring 43 and institute It states between second spring fixed ring 44, the end of the connecting screw 45 is set in the second spring fixed ring 44, and institute Stating connecting screw 45/ and the connector 46 can slide in the second spring fixed ring 44, when passing through the control lever 12 When pushing the hydraulic tappet 20, the end of the hydraulic tappet 20 drives the first spring fixed ring 43 to compress the reset Spring 42, after external force is eliminated, reset spring 42 can force the first spring fixed ring 43 to be replied, to make hydraulic tappet 20 It replys.

Distance between the first spring fixed ring 43 and the second spring fixed ring 44, i.e., described 20 institute of hydraulic tappet The maximum distance that can be moved downward.

The resetting apparatus 40 is mounted on the end of hydraulic tappet 20, and reset spring 42 is mounted on outside valve body 30, and structure is more Adduction reason, improves the space utilization rate of valve body 30, and each channel of valve body 30 can more reasonable design.

It is limited for convenience in the cooperation of hydraulic tappet 20 and spring fixed ring 43 and 44 and the sliding of hydraulic tappet 20 System and reply, using following design, one end far from the second spring fixed ring 44 of the first spring fixed ring 43 Radially outwardly extending have the first stop collar 431, the first spring fixed ring 43 close to the one of the second spring fixed ring 44 End diameter is inwardly extended with the second stop collar 432, and 20 side of hydraulic tappet is equipped with hierarchic structure, and the hierarchic structure supports On first stop collar 431, the end of the hydraulic tappet 20 is supported on second stop collar 432, second bullet One end diameter close to the first spring fixed ring 43 of spring fixed ring 44 is inwardly extended with third stop collar 441, the connection Screw 45 is limited in the second spring fixed ring 44 by the third stop collar 441, therefore, 20 energy of hydraulic tappet The height of lifting is restricted, the maximum height that hydraulic tappet 20 can be lifted, that is, connecting screw 45 bottom face and institute State the distance of the bottom surface of groove 411.

The side that the pedestal 41 is located at the opening of the groove 411 is equipped with sealing 412, sets in the sealing 412 There is sealing ring 413, the sealing ring 413 is contacted with the side of the second end piston 22 of the hydraulic tappet 20, the sealing 412 can be inserted into the lower ending opening 314 of the valve body 30, be installed on the valve body 30 convenient for the pedestal 41, by described Sealing 412 and the sealing ring 413 avoid dust from entering the valve body 30 from the lower ending opening 314 of the valve body 30 It is interior, and dust is avoided to enter in the pedestal 41.

In the description and claims of this application, word "comprises/comprising" and word " have/including " and its become Shape, for the presence of specified stated feature, numerical value, step or component, but do not preclude the presence or addition of it is one or more its His feature, numerical value, step, component or their combination.

Some features of the utility model, it is clear to illustrate, it describes in various embodiments respectively, however, these are special Sign, which can also be incorporated into single embodiment, to be described.On the contrary, some features of the utility model, for simplicity, only single It is described in embodiment, however, these features can also be independent or be described in different embodiments in any suitable combination.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should all be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (7)

1. a kind of overflow valve, which is characterized in that the overflow valve include overflow valve body, the overflow inlet on overflow valve body, Overflow outlet is set to the intracorporal overflow spool of the overflow valve, overflow valve spring, overflow piston, one end of the overflow spool Connect the overflow valve spring, the other end of the overflow spool connects the overflow piston, described in the overflow seal spool Channel between overflow inlet and overflow outlet squeezes the overflow valve when the oil pressure in oil input channel is greater than certain value Core and open the overflow inlet and the overflow outlet between channel, when the overflow spool be gradually opened the overflow into Mouthful and the overflow outlet between channel when, the overflow piston gradually seals the overflow inlet.

2. overflow valve according to claim 1, which is characterized in that the overflow spool includes cone valve and spring connection Part, the tapered end of the cone valve connect the overflow piston, and the bottom end of the cone valve connects the spring fastenings, and the spring connects Fitting connects the overflow valve spring.

3. overflow valve according to claim 2, which is characterized in that there is the overflow valve body the first wasteway and second to overflow Runner, first wasteway are connected to second wasteway, and the diameter of first wasteway is less than second overflow The diameter in road, the overflow inlet are set on the side wall of first wasteway, and the overflow outlet is set to second overflow On the side wall in road.

4. overflow valve according to claim 1-3, which is characterized in that the overflow valve body includes the first overflow part With the second overflow part, the outer diameter of first overflow part is less than the outer diameter of second overflow part, and the overflow inlet is set to institute It states in the first overflow part, the overflow outlet is set on the side wall of second overflow part.

5. overflow valve according to claim 1-3, which is characterized in that the overflow valve further includes that spring is adjusted Part, the spring adjustor connects the overflow valve spring, for adjusting the pressing force of the overflow valve spring.

6. overflow valve according to claim 5, which is characterized in that the spring adjustor includes nut and adjusting spiral shell Silk, the nut is fixed on the overflow valve body, the end of the adjusting screw connect the overflow valve spring and with The nut thread connection.

7. overflow valve according to claim 6, which is characterized in that the spring adjustor further includes overflow sealing ring, institute Overflow sealing ring is stated to connect the end of the adjusting screw and contact with the bore seal of the overflow valve body, the overflow valve bullet The end of spring connects the overflow sealing ring.