CN117685265A - Pressure reducing valve and hydraulic system - Google Patents

Abstract

Embodiments of the present disclosure provide pressure relief valves and hydraulic systems, the valves comprising: the sleeve comprises a first installation cavity and communicated outflow holes; the valve seat comprises a second installation cavity which is communicated with the first installation cavity through an inner hole of the valve seat; an inflow hole arranged on the valve seat; a plug piece corresponds to the inner hole of the valve seat; a blocking piece fixedly connected with the other end of the valve seat; the elastic component is propped between the plug and maintains the elastic force which drives the plug to move towards the position of the inner hole of the plug valve seat; the valve core is provided with a pressing part corresponding to the plug piece towards one end of the valve seat inner hole, and the flow passage is conducted/closed when the plug piece is pressed to be separated from/block the valve seat inner hole; the valve core driving assembly is abutted against the other end of the valve core, which is far away from the inner hole of the valve seat; an adjusting member drives the valve element. Maintaining the blockage of the inner hole of the valve seat by using a plug piece under the elasticity, and maintaining the blockage by matching with the fluid pressure; when the valve core pushes away the plug piece to conduct the flow passage, the sealing component prevents fluid from penetrating into the mounting cavity; the elastic force of the valve core driving assembly controls the valve to open/close, so that leakage is prevented.

Description

Pressure reducing valve and hydraulic system

Technical Field

The disclosure relates to the field of mechanical technology, and in particular to a pressure reducing valve and a hydraulic system.

Background

In the current hydraulic system, a valve core of a pressure reducing valve is in clearance fit with a body of the hydraulic system, so that liquid in the hydraulic system can be leaked, the hydraulic system can generate heat and the pressure is unstable, the running speed of an actuating mechanism is further influenced, and serious consequences such as control failure can be caused.

Disclosure of Invention

In view of the above-described drawbacks of the related art, an object of the present disclosure is to provide a pressure reducing valve and a hydraulic system that solve the problems in the related art.

A first aspect of the present disclosure provides a pressure reducing valve, comprising: a sleeve, comprising: a first mounting cavity located between opposite open ends of the sleeve; the outflow hole is arranged on the sleeve and communicated with the first installation cavity; a valve seat having one end fixedly connected to one end of the sleeve, comprising: the second installation cavity is communicated with the first installation cavity through an inner hole of the valve seat; the inflow hole is arranged on the valve seat and communicated with the second installation cavity; a plug member movably disposed in the second mounting chamber to a position to disengage from or block the valve seat inner bore to respectively pass through or seal the valve seat inner bore; the blocking piece is fixedly connected with the other end of the valve seat far away from the sleeve; the elastic component is propped between the plug and maintains the elastic force which drives the plug to move towards the position of blocking the inner hole of the valve seat; the valve core can be arranged in the first mounting cavity in a way of approaching or moving away from the inner hole of the valve seat; one end of the valve core, which faces the valve seat inner hole, is provided with a pressing part which is arranged in a protruding way corresponding to the valve seat inner hole, and the pressing part can move along with the valve core, which is close to the valve seat inner hole, so as to penetrate through the valve seat inner hole to press the plug; and a gap is kept between the valve core and the valve seat so as to communicate the valve seat inner hole with the outflow hole, so that when the pressing part presses the plug piece to be separated from/block the valve seat inner hole, a flow passage between the inflow hole and the valve seat inner hole to the outflow hole is conducted/closed; the valve core driving assembly is movably arranged in the first mounting cavity, is abutted against the other end of the valve core, which is far away from the inner hole of the valve seat, and maintains elastic force for driving the valve core to move towards the plug member; the adjusting piece is connected with the valve core driving assembly from the other end of the sleeve and used for receiving operation to apply force to the valve core driving assembly to drive the valve core to move towards the plug piece, and the elastic force of the valve core driving assembly can be adjusted.

In an embodiment of the first aspect, the spool drive assembly includes: the driving seat is arranged corresponding to the valve core in position; the stress seat is connected with the driving seat through a second elastic piece and can be drivingly connected with the adjusting piece; the elastic deformation amount of the second elastic member can be adjusted by the operation of the adjusting member.

In an embodiment of the first aspect, the pressure reducing valve comprises: the cover body is fixedly covered on the other end of the sleeve, and is provided with a screw hole communicated with the first mounting cavity; the adjusting member includes: the screw rod is in threaded connection with the threaded hole in a penetrating way and is abutted against the valve core driving assembly, and the screw rod is used for receiving rotation operation so as to conduct telescopic movement in the threaded hole.

In an embodiment of the first aspect, the screw sleeve is provided with a first tightening nut.

In an embodiment of the first aspect, a mating structure is formed between the valve core driving assembly and a contact surface of one end of the valve core; the mating structure includes: the ball head is rotatably combined with the groove.

In an embodiment of the first aspect, the stopper is provided with a guide cavity with an opening pointing towards the stopper, and the elastic component is arranged in the guide cavity; the elastic assembly includes: one end of the first elastic piece is abutted against the bottom wall of the guide cavity; the two opposite ends of the pressing piece are respectively abutted against the other end of the first elastic piece and the plug piece; wherein the contact surface between the pressing piece and the plug piece is matched with the shape of the surface.

In an embodiment of the first aspect, a first stop portion is disposed in the first installation cavity in a movement direction of the valve element away from the valve seat inner hole; and/or a second stop part is arranged in the first mounting cavity in the moving direction of the valve core driving assembly, which is close to the inner hole of the valve seat.

In an embodiment of the first aspect, the first stop portion and/or the second stop portion comprises a reducing step portion.

In an embodiment of the first aspect, the plug is spherical; and/or, the fixed connection comprises a threaded connection; and/or, the sleeve is circumferentially provided with external threads for being in threaded connection with the outside at the outer surface of one end connected with the valve seat, and the sleeve is also sleeved with a second tightening nut in threaded connection with the threads; a first sealing ring and a second sealing ring are arranged between a second tightening nut which is in threaded connection with the outside of the sleeve and the sleeve, and are respectively positioned at two ends of the second tightening nut in the axial direction; and/or the wall surface of the sleeve is provided with an exhaust hole communicated with the first installation cavity, the exhaust hole is provided with a groove part towards one outer end of the sleeve, and the groove part is used for sealing the sealing element; and/or the sleeve is circumferentially provided with an annular groove communicated with the exhaust hole, and the annular groove is filled with the sealing ring.

A second aspect of the present disclosure provides a hydraulic system comprising: the body is provided with a first liquid hole, a second liquid hole and a liquid cavity communicated with the first liquid hole and the second liquid hole; the liquid cavity forms a mounting cavity hole; the pressure reducing valve according to any one of the first aspect, wherein an end provided with a stopper is inserted into the liquid chamber from the mounting chamber hole to a predetermined position and fixed; and in the preset position, the valve seat is in sealing contact with the body so as to enable the first liquid hole to be communicated with the inflow hole, and the second liquid hole is communicated with the outflow hole.

As described above, in embodiments of the present disclosure there is provided a pressure reducing valve and a hydraulic system, the valve comprising: the sleeve comprises a first installation cavity and communicated outflow holes; the valve seat comprises a second installation cavity which is communicated with the first installation cavity through an inner hole of the valve seat; an inflow hole arranged on the valve seat; a plug piece corresponds to the inner hole of the valve seat; a blocking piece fixedly connected with the other end of the valve seat; the elastic component is propped between the plug and maintains the elastic force which drives the plug to move towards the position of the inner hole of the plug valve seat; the valve core is provided with a pressing part corresponding to the plug piece towards one end of the valve seat inner hole, and the flow passage is conducted/closed when the plug piece is pressed to be separated from/block the valve seat inner hole; the valve core driving assembly is abutted against the other end of the valve core, which is far away from the inner hole of the valve seat; an adjustment member drives the valve core. The elastic force of the elastic component is utilized to maintain the trend of blocking the inner hole of the valve seat, and the elastic component can be combined with the pressure of the inflow fluid; the valve core driving assembly controls the opening/closing of the valve; the seal assembly prevents fluid from penetrating into the mounting cavity, and prevents leakage of fluid in the valve open/closed state.

Drawings

Fig. 1 shows a schematic cross-sectional structure of a pressure reducing valve in an embodiment of the present disclosure.

Fig. 2 shows a schematic structural view of a relief valve in a hydraulic system in an embodiment of the present disclosure in an open state.

Fig. 3 shows a schematic structural view of a pressure reducing valve in a hydraulic system in an embodiment of the disclosure.

Detailed Description

Other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the following detailed description of the embodiments of the disclosure given by way of specific examples. The disclosure may be embodied or applied in other different specific forms, and details of the disclosure may be modified or changed from various points of view and application without departing from the spirit of the disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

The embodiments of the present disclosure will be described in detail below with reference to the attached drawings so that those skilled in the art to which the present disclosure pertains can easily implement the same. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

In the description of the present disclosure, references to the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or a group of embodiments or examples. Furthermore, various embodiments or examples, as well as features of various embodiments or examples, presented in this disclosure may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the representations of the present disclosure, "a set" means two or more, unless specifically defined otherwise.

For the purpose of clarity of the present disclosure, components that are not related to the description are omitted, and the same or similar components are given the same reference numerals throughout the specification.

Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" with other elements interposed therebetween. In addition, when a certain component is said to be "included" in a certain device, unless otherwise stated, other components are not excluded, but it means that other components may be included.

Although the terms first, second, etc. may be used herein to connote various elements in some examples, the elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, a first interface, a second interface, etc. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, modules, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, modules, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the language clearly indicates the contrary. The meaning of "comprising" in the specification is to specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of other features, regions, integers, steps, operations, elements, and/or components.

Although not differently defined, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The term append defined in commonly used dictionaries is interpreted as having a meaning that is consistent with the meaning of the relevant technical literature and the currently prompted message, and is not excessively interpreted as an ideal or very formulaic meaning, so long as no definition is made.

The hydraulic pressure reducing valve is a valve for controlling the pressure of a hydraulic system, and can control the pressure and the flow of the hydraulic system by adjusting the opening area or the opening and closing state of the valve. However, clearance fit is adopted between a valve core of the conventional pressure reducing valve and a body of the hydraulic system, the closing of the pressure reducing valve is completely dependent on the valve core, so that liquid in the hydraulic system is easy to leak, the hydraulic system heats and the pressure is unstable, the running speed of an actuating mechanism is further influenced, and serious consequences such as control failure can be even caused.

In view of this, a pressure reducing valve is provided in an embodiment of the present disclosure for solving the problem of liquid leakage in the related art. It should be noted that the pressure reducing valve is not limited to hydraulic systems, or in some examples, may be applied to pneumatic systems, not limited to hydraulic systems. Thus, in the description of the pressure relief valve embodiments below, a "fluid" is used instead of a "liquid".

As shown in fig. 1, a schematic cross-sectional structure of a pressure reducing valve in an embodiment of the present disclosure is shown.

In fig. 1, the pressure reducing valve includes: sleeve 5, disk seat 3, blanking member 1, elastic component 20, case 8, case drive assembly 16 and regulating member 13.

The sleeve 5 comprises a first mounting cavity 51. The first mounting cavity 51 is located between opposite open ends of the sleeve 5, which may be open ends, in communication with the first mounting cavity 51. As can be seen in fig. 1, the sleeve 5 is hollow, and the hollow area is the first mounting cavity 51. The sleeve 5 may extend in a central axis direction and the first mounting cavity 51 may also extend in the straight direction. Illustratively, the first mounting cavity 51 may be divided into two cavity sections, a first cavity section 511 on the left for setting the valve spool 8 and a second cavity section 512 on the right for setting the valve spool drive assembly 16. The diameters between the first chamber section 511 and the second chamber section 512 may be different, i.e. there is a variable diameter connection between the first chamber section 511 and the second chamber section 512.

The pressure relief valve may be, for example, a plug-in type. The sleeve 5 is provided with external threads 55 on a circumferential surface of one end connected with the valve seat 3 for being screwed with the outside, so that the sleeve is screwed with internal threads on the inner wall of a cavity to be installed when the pressure reducing valve is inserted into the installation cavity (such as a hydraulic system). Further exemplary, the sleeve 5 may be further sleeved with a second tightening nut 7 screwed with the external thread 55, and the second tightening nut 7 may be used to fasten the sleeve 5 to a surface of a mounting position (e.g., a hydraulic system body) of the sleeve 5, so as to prevent the screw connection of the outer surface of the sleeve 5 from loosening.

Illustratively, a sealing assembly may be provided between the second tightening nut 7 and the sleeve, such as a first sealing ring 71 at the front end of the second tightening nut 7 and a second sealing ring 72 at the rear end of the second tightening nut 7 as shown. The first sealing ring 71 is used for pressing to the surface of the mounting position along with the second tightening nut 7 so as to isolate the outside from the inner space of the sleeve 5 from the front end of the second tightening nut 7, and the second sealing ring 72 is used for isolating the outside from the inner space of the sleeve 5 from the rear end of the second tightening nut 7. The first seal ring 71 and the second seal ring 72 are also shown in fig. 2 and 3.

The sleeve 5 is provided with an outflow bore P2. Illustratively, the outflow bore P2 is closer to the end of the sleeve 5 to which the valve seat 3 is attached than the threads of the outer surface of the sleeve 5. That is, in the example of fig. 1, the outflow hole P2 is closer to the left end of the sleeve 5 than the external thread 55. Thus, when the relief valve is inserted into the installation cavity, the outlet hole P2 can be deeper into the installation cavity than the threaded connection of the external thread 55 so as to be in communication with the chamber in the installation cavity.

One end of the valve seat 3 is fixedly connected with one end of the sleeve 5. The fixed connection may be a threaded connection, for example, the sleeve 5 is provided with an internal thread on an inner wall of one end corresponding to the valve seat 3, and the outer surface of the corresponding portion of the valve seat 3 is provided with a matched external thread, etc. The valve seat 3 comprises a second installation cavity 31, the valve seat 3 is further provided with a valve seat inner hole 32, and the second installation cavity 31 is communicated with the first installation cavity 51 through the valve seat inner hole 32. Illustratively, the second mounting cavity 31 and the valve seat bore 32 may be disposed coaxially with the first mounting cavity 51.

The valve seat 3 is further provided with an inflow hole P1 communicating with the second installation cavity 31. It will be appreciated that the inlet port P1 extends through the second mounting chamber 31, the valve seat bore 32, the first mounting chamber 51 to the outlet port P2 to form a flow path for reduced pressure bleed flow. When the valve seat inner bore 32 is open, the flow passage is open; when the valve seat bore 32 is blocked, the flow passage is broken. In the example of fig. 1, the left front end of the valve seat 3 may be provided with a bevel for sealing contact with the outside. The inflow hole P1 may be provided at the left side of the inclined plane. The position of the inlet P1 may be changed according to actual requirements, so that the pressure reducing valve may be conveniently communicated with the outside and the valve seat inner hole 32 when the pressure reducing valve is inserted into the mounting cavity, and the present invention is not limited to the illustrated structure.

The plug 6 is movably disposed in the second mounting chamber 31, such as movable in the axial direction, to a position out of or blocking the valve seat bore 32 to respectively pass through or seal the valve seat bore 32. The plug 6 may be spherical, rolling and with little friction, for example. Further exemplary, the plug 6 may be a metal ball, such as a steel ball or the like. The plug 6 is sufficiently pressurized to seal against the valve seat bore 32 to form a hard seal with the valve seat bore 32. Alternatively, the plug 6 may have other shapes.

The blocking piece 1 is fixedly connected with the other end of the valve seat 3, which is far away from the sleeve 5. The fixed connection may be, for example, a threaded connection with internal and external screw threads. Illustratively, the plug 1 may be provided with a guide cavity 111 open to the plug 6, and the elastic member 20 is disposed in the guide cavity 111 to elastically expand and contract along the guide cavity 111. The guide chamber 111 may extend in the axial direction, and may be axially disposed with the first and second mounting chambers 51 and 31 and the valve seat inner hole 32. Of course, the coaxial arrangement can make the pressure reducing valve be integrally formed as a standard piece of a central symmetrical tubular body, and the pressure reducing valve is convenient to manufacture. Alternatively, in other embodiments, the pressure reducing valve may be changed according to actual needs, for example, the pressure reducing valve may be a non-standard special structure.

The elastic component 20 is abutted between the plug 1 and the plug 6, and maintains elastic force which drives the plug 6 to move towards the position of blocking the valve seat inner hole 32. Specifically, when the plug 6 blocks the valve seat inner hole 32, the elastic component 20 still has elastic deformation to form elastic force, and the elastic force presses the plug 6 to maintain the position of blocking the valve seat inner hole 32.

Illustratively, the elastic assembly 20 includes a first elastic member 2 and a pressing member 4. One end of the first elastic member 2 abuts against the bottom wall of the guide cavity 111, and the other end abuts against the pressing member 4. The first elastic member 2 may be illustratively a spring, and further alternatively may be a one-way spring. Opposite ends of the pressing piece 4 are respectively abutted against the other end of the first elastic piece 2 and the plug piece 6. Wherein the contact surface between the pressing piece 4 and the plug 6 is matched. For example, in fig. 1, the plug 6 is spherical, and the pressing member 4 may have a curved recess with a spherical crown shape adapted in size to support the plug 6. Illustratively, in fig. 1, the pressing member 4 may be a cylinder having a sidewall, and may cover the first elastic member 2. The guiding cavity 111 may also be a cylindrical cavity with an adapted diameter, and the pressing element 4 is cooperatively placed in the guiding cavity 111, and the side wall of the pressing element corresponds to the inner wall of the guiding cavity 111, so that the sliding stability of the elastic component 20 along the guiding cavity 111 is better. Alternatively, in other embodiments, the pressing member 4 may not have a sidewall, but may directly include a pressing head, where two end surfaces respectively press the first elastic member 2 and the plug member 6, so as to achieve both sliding stability and cost reduction due to omitting the sidewall.

The valve element 8 is arranged in the first mounting chamber 51 in a manner that it can move closer to or farther away from the valve seat inner bore 32. In the example of fig. 1, the spool 8 is slidable along the first mounting chamber 51.

One end of the valve core 8 facing the valve seat inner hole 32 is provided with a pressing part 81 which is arranged in a protruding way corresponding to the valve seat inner hole 32, and the pressing part can move along with the valve core 8 which is close to the valve seat inner hole 32 so as to penetrate through the valve seat inner hole 32 to press the plug 6. In the example of fig. 1, the valve element 8 is provided with the pressing portion 81 toward a center position of one end surface of the valve seat inner bore 32, and the pressing portion 81 may be a cylindrical portion. The end surface may take on a shape that gradually decreases from the abutment 81 to the periphery so that a gap 15 is maintained between the piston 6, said gap 15 being open to the valve seat bore 32.

The gap 15 may communicate the valve seat inner hole 32 with the outflow hole P2, so as to open/close the flow path between the inflow hole P1, the valve seat inner hole 32 and the outflow hole P2 when the pressing portion 81 presses the stopper 6 to disengage/block the valve seat inner hole 32. In particular, as can be seen in the example of fig. 1, the position of the outflow hole P2 is on the portion of the sleeve 5 between the opposite surfaces of the valve seat 3 and the valve body 8, and is not in the sliding stroke of the valve body 8, whereby communication with the gap 15 can be maintained. Since the pressing portion 81 is provided for passing through the valve seat inner hole 32 from one side to the stopper 6 pressed against the other side, the diameter of the pressing portion 81 is smaller than the diameter of the flow hole, so that a space is left between the pressing portion 81 and the valve seat inner hole 32 when penetrating into the valve seat inner hole 32, the gap 15 can be communicated between the pressing portion 81 and the valve seat inner hole 32 from the outflow hole P2, and when the stopper 6 is separated from the valve seat inner hole 32 under the pressure of the pressing portion 81, the inflow hole P1 can be conducted to the flow path of the outflow hole P2 through the gap 15. Conversely, if the pressing portion 81 does not push the plug 6 to separate from the valve seat inner hole 32, the flow path is closed, and the inlet port P1 cannot communicate with the outlet port P2.

In some embodiments, to prevent the spool 8 from moving beyond the second chamber section 512, the first chamber section 511 may be provided with a first stop 5111 in the direction of movement of the spool 8 away from the valve seat bore 32. Illustratively, the first stop 5111 includes a reducing step. As can be seen from fig. 1, the first stop 5111 can prevent the spool 8 from moving rightward.

The valve core 8 may further be provided with a sealing component in sealing engagement with the inner wall of the first mounting cavity 51 to isolate the second cavity section 512 from the fluid entering the first cavity section 511 and prevent the fluid from penetrating into the second cavity section 512. Illustratively, the seal assembly may include one or more seal rings of elastomeric material, such as the third seal ring 811 of FIG. 1. Further, for example, engine oil can be arranged between the sealing ring and the inner wall to lubricate, so that the valve core 8 can slide smoothly and stably.

The valve core driving assembly 16 is movably disposed in the first mounting cavity 51. In the example of fig. 1, the spool drive assembly 16 is slidably disposed in the axial direction in the second chamber section 512 of the first mounting chamber 51. One end of the valve core driving assembly 16 is abutted against the other end of the valve core 8 away from the valve seat inner hole 32, and the other end of the valve core driving assembly 16 is drivingly connected with the adjusting piece 13. The valve core driving assembly 16 can drive the valve core 8 to move towards the plug member 6 under the urging force of the adjusting member 13.

In some embodiments, a second stop 5121 is disposed in the first mounting chamber 51 in the direction of movement of the valve core drive assembly 16 adjacent the valve seat bore 32. In the example of fig. 1, the second stop 5121 may include a step portion with a reduced diameter, and may be specifically implemented as a step portion formed by reducing a diameter at a connection between the second cavity section 512 and the first cavity section 511. The second stop 5121 is configured to limit the valve element driving assembly 16 to the second cavity section 512, and limit the stroke of the valve element driving assembly 16 to push the valve element 8, that is, limit the valve element driving assembly 16 to push the valve element 8 to the left in fig. 1.

The valve core driving assembly 16 can maintain elastic force driving the valve core 8 to move towards the plug 6. By way of example, in fig. 1, the spool drive assembly 16 includes: a driving seat 10, a stress seat 12 and a second elastic member 9.

The drive seat 10 is provided in correspondence with the position of the valve element 8. The driving seat 10 is provided with the pressing portion 81 toward one end surface of the valve body 8. The force-receiving seat 12 can be drivingly connected to the adjustment member 13. The second elastic piece 9 is arranged between the driving seat 10 and the stress seat 12, and drives the driving seat 10 to move under the pushing of the stress seat 12. The second elastic member 9 may be exemplified by a spring, and may be compressed by different pressures to generate different elastic deformation amounts to provide elastic forces of different strengths to the valve element 8. The elastic deformation amount of the second elastic member 9 is determined by the interval between the driving seat 10 and the force receiving seat 12. The adjusting member 13 may push the force receiving seat 12 to adjust the distance between the force receiving seat and the driving seat 10, so that the elastic deformation amount of the second elastic member 9 may be adjusted by the operation of the adjusting member 13. The stroke of the driving seat 10 is limited at the first stop 5111, and the relative position of the stress seat 12 and the driving seat 10 is adjusted by the adjusting member 13, so as to obtain the elastic force of the second elastic member 9 with the required elastic force.

After the valve core 8 pushes the plug 6 to conduct the valve seat inner hole 32, the plug 6 is continuously subjected to the resilience force of the elastic component 20. When connecting, for example, a hydraulic or pneumatic system, the valve element 8 is in a state of pushing away the plug 6, and is subjected to a resultant force of the fluid pressure directed to the valve seat inner bore 32 and the elastic force of the first elastic member 2; when the spool 8 is pushed by the resultant force to separate from the plug 6, it is fluid pressure. Then, when the spool 8 pushes the plug 6 leftward, whether the spool 8 is pushed back rightward depends on the result of the reaction between the resultant force or the fluid pressure to which the spool 8 is subjected and the elastic force of the second elastic member 9, that is, the result of the comparison. Thereby, the elastic force of the second elastic member 9 can be adjusted by the adjusting member 13 to set the elastic force of the second elastic member 9 to be the same or similar value as the expected fluid pressure value as the "set value". Thus, when the fluid pressure or the resultant force related to the fluid pressure reaches the set value, the action of pushing the plug 6 and the valve core 8 back is triggered, so that the plug 6 blocks the valve seat inner hole 32 to close the flow passage.

The adjusting member 13 is connected to the valve element driving assembly 16 from the other end of the sleeve 5, and is operated to apply a force to the valve element driving assembly 16 to drive the valve element 8. In some embodiments, the pressure reducing valve may include a cover 11, where the cover 11 is fixedly covered on the other end of the sleeve 5, and a screw hole is provided to communicate with the first mounting cavity 51. As an example, in fig. 1 the cover 11 is arranged on the right side of the sleeve 5, both being screwed. Specifically, the center of the cover 11 may be provided with a through screw hole having an internal thread.

The adjusting member 13 may include a screw, which is screwed through the screw hole to abut against the valve core driving assembly 16, so as to receive a rotation operation to perform a telescopic motion in the screw hole. As an example, in fig. 1, the outer wall of the screw of the operating member has an external thread, the screw is screwed with the screw hole, and the relative position of the screw and the screw hole can be adjusted by rotating the screw, so that the deformation amount of the second elastic member 9 can also be adjusted. Illustratively, the screw may be sleeved with a first tightening nut 14. The first tightening nut 14 may be located on a portion of the screw exposed to the sleeve 5, and is used to lock the deformation of the second elastic member 9, so as to lock the pressure of the valve core driving assembly 16 on the valve core 8 to be a set pressure.

The structure for adjusting pressure by matching the screw and the screw hole is formed between the contact surface of the valve core driving assembly 16 and one end of the valve core 8 in some embodiments. The mating structure includes: a ball 101 and a groove 82, the ball 101 is rotatably combined with the groove 82. When the screw of the adjusting member 13 rotates relative to the screw hole to adjust the pressure, the ball 101 rotates in the groove 82, so that the valve core 8 is not driven to rotate, and the pressure adjusting moment can be saved.

In the example of fig. 1, the ball 101 may be disposed on an end surface of the valve element driving assembly 16 facing the valve element 8. Further exemplary, the ball 101 may be located at an end face of the driving socket 10, preferably at a central position. That is, the driving seat 10 may be a ball seat. The recess 82 may be provided at an end face of the spool 8 facing the spool drive assembly 16, preferably at a central location.

In some examples, as shown in fig. 1 to 3, the wall surface of the sleeve 5 may further be provided with an exhaust hole 52 communicating with the first installation cavity 51 for exhausting the first installation cavity 51. Specifically, the vent 52 may be in communication with the second chamber section 512 of the first mounting chamber 51. In a further example, the vent 52 may be provided with a groove 53 towards one end of the sleeve 5, said groove 53 may be plugged with a seal 54 for closing the vent 52. As an example, the groove 53 may be an annular groove, circumferentially disposed around the sleeve 5, and the seal 54 may be a sealing ring. The number of the exhaust holes 52 may be one or more.

The principle of operation of the relief valve is described in connection with a hydraulic system. Referring to fig. 2 and 3, fig. 2 is a schematic diagram showing a structure of a relief valve in a hydraulic system in an open state according to an embodiment of the disclosure. Fig. 3 shows a schematic structural view of a pressure reducing valve in a hydraulic system in an embodiment of the disclosure.

The hydraulic system comprises a body 17, wherein the body 17 is provided with a first liquid hole P, a second liquid hole P3 and a liquid cavity 18 communicated with the first liquid hole P and the second liquid hole P3, and the liquid cavity is provided with a mounting cavity hole 19. The second fluid port P3 may be connected to an actuator.

The hydraulic valve in the example of fig. 1, which is provided with a stopper 1, is inserted into the liquid chamber 18 from the installation chamber hole 19 to a preset position and fixed. As shown in the example of fig. 2, the hydraulic valve may be fastened to the hydraulic system by screwing the external thread 55 on the outer surface of the sleeve 5 with the internal thread on the inner wall of the mounting cavity 19 and pressing the second tightening nut 7 against the adjacent wall of the mounting cavity 19.

The hydraulic valve is mounted in the predetermined position so that the valve seat 3 is in sealing contact with the body 17. For example, in fig. 2 and 3, the peripheral portion of the valve seat 3 is fitted with a fitting opening on the wall surface of the body 17 in the mounting cavity 19 to form a seal, and it is exemplarily seen that a slope at the left end thereof is tightly engaged with a corresponding wall surface of the fitting opening to form a seal. In this state, the first passage 181 and the second passage 182 that are not communicated with each other can be formed in the liquid chamber 18. The sealing between the blocking piece 1 and the inner wall of the liquid cavity 18 is not formed, and the first liquid hole P is communicated with the inlet hole P1 of the valve seat 3 after passing over the blocking piece 1 through the first channel 181. The second liquid hole P3 communicates with the outflow hole P2 of the sleeve 5 through the second passage 182.

As shown in fig. 2, when the position of the regulator 13 is not adjusted, the hydraulic system is not closed with oil. Specifically, the first fluid hole P is filled with oil, the pressure oil reaches the inlet hole P1 through the fluid channel, the plug 6 is pressed against the valve seat inner hole 32, so that the pressure oil in the fluid channel between the inlet hole P1 and the outlet hole P2 is not communicated, and the pressure oil in the outlet hole P2 does not enter the second fluid hole P3 to reach the actuator.

As shown in fig. 3, when the adjusting member 13 is rotated to adjust the position, the adjusting member 13 is screwed in, the force generated by the adjusting member is acted on the second elastic member 9 by the force-bearing seat 12, the second elastic member 9 is pressed to generate elastic force, the elastic force is transmitted to the valve core 8 by the driving seat 10, the valve core 8 moves leftwards, the plug member 6 is pushed away from the valve seat inner hole 32, and the passages from the first liquid hole P, the inflow hole P1, the outflow hole P2 to the second liquid hole P3 are opened.

When the pressure at the second liquid hole P3 continuously rises, the fluid pressure born by the valve core 8 is greater than the elasticity of the second elastic piece 9, so that the valve core 8 moves rightwards; the stopper 6 is moved rightward by the elastic force of the elastic member 20 and the hydraulic pressure from the first fluid port P, so that the stopper 6 is hard-sealed with the valve seat inner hole 32, and returns to the state of fig. 2, thereby closing the flow passage from the inflow port P1 to the outflow port P2.

When the load pressure of the second liquid hole P3 is unchanged, the plug 6 is always pressed on the inner hole 32 of the valve seat by the resultant force, so that the flow passage from the inlet hole P1 to the outlet hole P2 can be kept at zero leakage, the pressure of the hydraulic system is continuously stable, and the safety of the hydraulic system is ensured. It will be appreciated that although a hydraulic system is used in this example, in other embodiments, for example, a pneumatic system, etc., may be used, and is not limited to this embodiment.

In summary, embodiments of the disclosure provide a pressure reducing valve and a hydraulic system, the valve including: the sleeve comprises a first installation cavity and communicated outflow holes; the valve seat comprises a second installation cavity which is communicated with the first installation cavity through an inner hole of the valve seat; an inflow hole arranged on the valve seat; a plug piece corresponds to the inner hole of the valve seat; a blocking piece fixedly connected with the other end of the valve seat; the elastic component is propped between the plug and maintains the elastic force which drives the plug to move towards the position of the inner hole of the plug valve seat; the valve core is provided with a pressing part corresponding to the plug piece towards one end of the valve seat inner hole, and the flow passage is conducted/closed when the plug piece is pressed to be separated from/block the valve seat inner hole; the valve core driving assembly is abutted against the other end of the valve core, which is far away from the inner hole of the valve seat; an adjustment member drives the valve core. The elastic force of the elastic component is utilized to maintain the trend of blocking the inner hole of the valve seat, and the elastic component can be combined with the pressure of the inflow fluid; the valve core driving assembly controls the opening/closing of the valve; the seal assembly prevents fluid from penetrating into the mounting cavity, and prevents leakage of fluid in the valve open/closed state.

The above embodiments are merely illustrative of the principles of the present disclosure and its efficacy, and are not intended to limit the disclosure. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present disclosure. Accordingly, it is intended that all equivalent modifications and variations which a person having ordinary skill in the art would accomplish without departing from the spirit and technical spirit of the present disclosure be covered by the claims of the present disclosure.

Claims (10)

1. A pressure relief valve, comprising:

a sleeve, comprising: a first mounting cavity located between opposite open ends of the sleeve; the outflow hole is arranged on the sleeve and communicated with the first installation cavity;

a valve seat having one end fixedly connected to one end of the sleeve, comprising: the second installation cavity is communicated with the first installation cavity through an inner hole of the valve seat; the inflow hole is arranged on the valve seat and communicated with the second installation cavity;

a plug member movably disposed in the second mounting chamber to a position to disengage from or block the valve seat inner bore to respectively pass through or seal the valve seat inner bore;

the blocking piece is fixedly connected with the other end of the valve seat far away from the sleeve;

the elastic component is propped between the plug and maintains the elastic force which drives the plug to move towards the position of blocking the inner hole of the valve seat;

the valve core can be arranged in the first mounting cavity in a way of approaching or moving away from the inner hole of the valve seat; one end of the valve core, which faces the valve seat inner hole, is provided with a pressing part which is arranged in a protruding way corresponding to the valve seat inner hole, and the pressing part can move along with the valve core, which is close to the valve seat inner hole, so as to penetrate through the valve seat inner hole to press the plug; and a gap is kept between the valve core and the valve seat so as to communicate the valve seat inner hole with the outflow hole, so that when the pressing part presses the plug piece to be separated from/block the valve seat inner hole, a flow passage between the inflow hole and the valve seat inner hole to the outflow hole is conducted/closed; the valve core is also provided with a sealing component which is in sealing fit with the inner wall of the first installation cavity;

the valve core driving assembly is movably arranged in the first mounting cavity, is abutted against the other end of the valve core, which is far away from the inner hole of the valve seat, and maintains elastic force for driving the valve core to move towards the plug member;

the adjusting piece is connected with the valve core driving assembly from the other end of the sleeve and used for receiving operation to apply force to the valve core driving assembly to drive the valve core to move towards the plug piece, and the elastic force of the valve core driving assembly can be adjusted.

2. The pressure relief valve of claim 1, wherein the spool drive assembly comprises:

the driving seat is arranged corresponding to the valve core in position;

the stress seat is connected with the driving seat through a second elastic piece and can be drivingly connected with the adjusting piece; the elastic deformation amount of the second elastic member can be adjusted by the operation of the adjusting member.

3. The pressure relief valve of claim 1, comprising:

the cover body is fixedly covered on the other end of the sleeve, and is provided with a screw hole communicated with the first mounting cavity;

the adjusting member includes: the screw rod is in threaded connection with the threaded hole in a penetrating way and is abutted against the valve core driving assembly, and the screw rod is used for receiving rotation operation so as to conduct telescopic movement in the threaded hole.

4. A pressure reducing valve according to claim 3, wherein the screw sleeve is provided with a first tightening nut.

5. A pressure reducing valve according to claim 1 or 3, wherein a mating structure is formed between the spool drive assembly and the spool end contact surface; the mating structure includes: the ball head is rotatably combined with the groove.

6. The pressure reducing valve according to claim 1, wherein the blocking member is provided with a guide chamber having an opening directed toward the blocking member, and the elastic member is provided in the guide chamber; the elastic assembly includes:

one end of the first elastic piece is abutted against the bottom wall of the guide cavity;

the two opposite ends of the pressing piece are respectively abutted against the other end of the first elastic piece and the plug piece;

wherein the contact surface between the pressing piece and the plug piece is matched with the shape of the surface.

7. The pressure reducing valve according to claim 1, wherein a first stopper is provided in the first installation chamber in a movement direction of the valve element away from the valve seat inner hole; and/or a second stop part is arranged in the first mounting cavity in the moving direction of the valve core driving assembly, which is close to the inner hole of the valve seat.

8. The pressure relief valve of claim 7, wherein the first stop and/or the second stop comprises a reducing step.

9. The pressure relief valve of claim 1, wherein the plug is spherical; and/or, the fixed connection comprises a threaded connection; and/or, the sleeve is circumferentially provided with external threads for being in threaded connection with the outside at the outer surface of one end connected with the valve seat, and the sleeve is also sleeved with a second tightening nut in threaded connection with the threads; and/or a first sealing ring and a second sealing ring are arranged between the second tightening nut which is in threaded connection with the outside of the sleeve and the sleeve, and are respectively positioned at two ends of the second tightening nut in the axial direction; and/or the wall surface of the sleeve is provided with an exhaust hole communicated with the first installation cavity, the exhaust hole is provided with a groove part towards one outer end of the sleeve, and the groove part is used for sealing the sealing element; and/or the sleeve is circumferentially provided with an annular groove communicated with the exhaust hole, and the annular groove is filled with the sealing ring.

10. A hydraulic system, comprising:

the body is provided with a first liquid hole, a second liquid hole and a liquid cavity communicated with the first liquid hole and the second liquid hole; the liquid cavity forms a mounting cavity hole;

the pressure reducing valve according to any one of claims 1 to 9, wherein an end provided with a stopper is inserted into the liquid chamber from the mounting chamber hole to a predetermined position and fixed; and in the preset position, the valve seat is in sealing contact with the body so as to enable the first liquid hole to be communicated with the inflow hole, and the second liquid hole is communicated with the outflow hole.