阅读说明：本技术 大通径分段阀芯液控换向阀 (Large-diameter sectional valve core hydraulic control reversing valve ) 是由 唐旭 王力 颜若飞 苟辽 于 2020-12-08 设计创作，主要内容包括：本发明公开的一种大通径分段阀芯液控换向阀,动作灵敏,泄漏量小。本发明通过下述技术方案实现：滑阀套和阀芯被分段为在第一滑阀套和第二滑阀套阀腔中作直线运动的第一滑阀芯和第二滑阀芯,分段式阀套的上设有间隔排列的线阵环槽,每个阀芯上制有哑铃型结构的H形封油段,第二滑阀芯的哑铃阀芯台油段封油长度大于或等于第一滑阀套给定的封油长度值,两个哑铃阀芯台阀芯颈部的沉割槽宽度距离之和换向行程与换向距离基本相等；阀芯移动过程,第一滑阀芯对接第二滑阀芯分别在第一滑阀套对接第二滑阀套腔体中作直线运动,相邻两封油长度的其中一个减小,另一个增大,形成高低压腔的压力差,由流体力学可知,环形缝隙泄漏量与封油长度成反比。(The large-drift-diameter sectional valve core hydraulic control reversing valve disclosed by the invention is sensitive in action and small in leakage quantity. The invention is realized by the following technical scheme: the slide valve sleeve and the valve core are segmented into a first slide valve core and a second slide valve core which move linearly in the valve cavities of the first slide valve sleeve and the second slide valve sleeve, linear array ring grooves which are arranged at intervals are arranged on the segmented valve sleeve, each valve core is provided with an H-shaped oil sealing section with a dumbbell-shaped structure, the oil sealing length of the dumbbell valve core platform oil section of the second slide valve core is larger than or equal to the given oil sealing length value of the first slide valve sleeve, and the sum of the width distances of the undercut grooves at the neck parts of the two dumbbell valve core platform valve cores is basically equal to the reversing distance; in the moving process of the valve core, the first sliding valve core is in butt joint with the second sliding valve core and makes linear motion in the cavity of the first sliding valve sleeve in butt joint with the second sliding valve sleeve respectively, one of the lengths of the two adjacent oil seals is reduced, the other one of the lengths of the two adjacent oil seals is increased to form the pressure difference of the high-pressure cavity and the low-pressure cavity, and the leakage amount of the annular gap is inversely proportional to the length of the oil seals according to hydrodynamics.)

1. A large-bore sectional valve core hydraulic control reversing valve comprises: the assembly is at valve case (1) valve cavity and is the sliding valve cover and the case of axial displacement to the valve body to and the assembly at valve body section of thick bamboo afterbody with spring case plug (6) of the concentric termination of sliding valve cover, its characterized in that: the slide valve sleeve and the valve core are segmented into a first slide valve core (3) and a second slide valve core (4) which move linearly in the valve cavities of the first slide valve sleeve (2) and the second slide valve sleeve (5), linear array ring grooves which are separated and arranged by sealing rings are arranged on the circumference of the segmented valve sleeve, an H-shaped oil sealing section with two large ends and a small middle part similar to a connecting shaft of a dumbbell-shaped structure is manufactured on the segmented valve core, the oil sealing length of the dumbbell valve core platform oil section of the second slide valve core (4) is greater than or equal to the oil sealing length value given by the first slide valve sleeve (2), and the sum of the width distances of undercut grooves at the neck parts of the two dumbbell valve core platform valve cores is basically equal to the reversing distance; in the moving process of the valve core, the first slide valve core 3 is in butt joint with the second slide valve core (4) and respectively makes linear motion in the cavity of the first slide valve sleeve (2) in butt joint with the second slide valve sleeve (5), one of the lengths of two adjacent oil seals is reduced, the other length of the two adjacent oil seals is inevitably increased, the pressure difference of a high-pressure cavity and a low-pressure cavity is formed, and the leakage amount of the annular gap is inversely proportional to the length of the oil seals according to fluid mechanics.

2. The large-bore sectional valve core hydraulic control directional control valve according to claim 1, characterized in that: the spring seat barrel is provided with a reset spring (7) and is coupled with the first sliding valve core (3).

3. The large-bore sectional valve core hydraulic control directional control valve according to claim 1, characterized in that: the head ends of the first sliding valve sleeve (2) and the second sliding valve sleeve (5) are fixed in the valve cavity of the valve shell (1) by a spring barrel plug (6) and a valve core limiting end cover (8) on the tail end.

4. The large-bore sectional valve core hydraulic control directional control valve according to claim 1, characterized in that: the rod end retaining ring of the second slide valve core (4) is embedded into the radial opening retaining groove of the first slide valve core (3) and is embedded into a whole, and the second slide valve core (4) is installed into the valve cavity of the valve shell (1) from either end of the first slide valve sleeve (2) or the second slide valve sleeve (5).

Technical Field

The invention relates to a sectional type slide valve structure applied to a hydraulic control valve of a mechanical hydraulic control system.

Background

The hydraulic control valve is an important component which directly affects the working process and working characteristics of the hydraulic system, and is used for controlling the flowing direction of liquid in the hydraulic system and regulating the pressure and flow of the liquid. The pressure control valve comprises an overflow valve, a pressure reducing valve, a sequence valve and a pressure relay and is used for controlling the oil pressure in the hydraulic system or realizing control through a pressure signal. The pressure control valve controls the oil pressure by comparing the hydraulic acting force with the spring force. Adjusting the spring force is changing the amount of pre-compression of the spring, which is referred to as a pressure adjusting spring. The leakage oil of the spring cavity is led back to the oil tank from the valve inner pore channel to the outlet of the valve, if the outlet pressure of the valve is not zero, the back pressure acts on the upper end of the valve core, and the inlet pressure of the valve is increased. For a high-pressure high-flow pressure valve, the pressure regulating spring is required to have a large spring force, so that the regulating performance is poor, and the structure is difficult to realize.

The reversing valve is characterized in that the valve core moves relatively in the valve body hole, and the oil ports are controlled to be connected or disconnected, so that the oil circuit of the hydraulic system is changed to change the flowing direction of oil, and the actuating element is started, stopped and changed in moving direction. Thereby realizing the valve for starting, stopping or changing the movement direction of the hydraulic actuator and the driving mechanism thereof. The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. The valve realizes the communication, cut-off and reversal of hydraulic oil flow, pressure unloading and sequential action control. The variety of the reversing valve is various, and the reversing valve can be divided into the following parts according to the structural form: the slide valve type, rotary valve type, ball valve type, cone valve type, etc. can be divided into the following parts according to the main oil path number communicated by the valve body: the two-way valve, the three-way valve, the four-way valve … and the like are divided according to the working position of the valve core in the valve body and the different channel numbers: two, three, four, etc., the "bit" and "on" are important concepts of the directional valve, with different "bits" and "on" constituting different types of directional valves. Bit: the number of operating positions at which the valve spool can be moved relative to the valve body. The terms "two-position valve" and "three-position valve" refer to a reversing valve having a spool with two or three different operating positions. General: the number of main oil passage ports (excluding the control oil port and the leakage oil port) which are externally connected with the valve body. The terms "two-way valve", "three-way valve" and "four-way valve" mean that two, three or four main oil passage ports are arranged on a valve body of the reversing valve. According to different use requirements, the three-position reversing valve has different communication forms among the oil ports when the valve core is in the middle position, and the communication form in the middle position is called as a sliding valve function. The mode of operating the valve core to move can be divided into: manual, motorized, electro-magnetic, hydraulic, electro-hydraulic, etc. The valve core shoulder and the valve body undercut groove can be a two-shoulder three-undercut groove or a three-shoulder five-undercut groove. Of which the spool valve type is most used. The matching position of the valve core of the slide valve type reversing valve and the valve body hole is a shoulder, and an annular groove communicated with oil in the valve body hole is a cutting groove. The valve body is provided with an external connecting oil port at the position of the undercutting groove. The spool body is universal, differing only in the size and shape of the spool land. But requires the valve core to be concentric with the valve body and to have a sufficient oil seal length. In engineering applications, the main energy requirements for a diverter valve are: when the oil way is communicated, the pressure loss is small; when the oil way is disconnected, the leakage amount is small; the valve core is transposed, the operating force is small, and the reversing is stable. If the axes of the geometric errors are parallel and do not coincide, radial unbalanced force occurs. If the valve core with the inverted cone axis is not coincident in parallel: radial imbalance forces increase eccentricity. If the valve core belt is cone-shaped, the axes are not coincident in parallel: radial unbalance force makes the eccentricity reduce, restraines chucking, case surface and has the arch: the radial unbalanced force causes the convex part to push the hole wall to clamp the valve core and the valve hole to generate dry friction, and the movement is hard. In order to reduce the leakage amount of the sliding valve part as much as possible, the fit clearance of the excircle of the valve core needs to be as small as possible, the commonly adopted method is to use the valve core and the valve sleeve in a fit way, the valve core does not move in the valve sleeve directly, the radial clearance of the valve core and the valve sleeve needs to be ground and matched, and the fit clearance is ensured to be 0.005-0.008 mm, so that the leakage amount of the sliding valve part can be ensured to be small. If the valve core connecting device is unreasonable in structural design, the valve core is easy to contact with the valve sleeve when the valve core is driven by an external force to do axial movement, and further radial additional force is generated. When the oil paths communicated by the slide valve are more, the length of the oil sealing structures of the slide valve core and the valve sleeve such as a two-position five-way structure, a two-position six-way structure and the like is inevitably longer, the radial annular gap grinding matching quality of the valve core and the valve sleeve is very low due to high working pressure, and the sealing ring on the valve sleeve is damaged in the assembling process when the length of the valve sleeve is too long. The damage causes mainly come from two aspects, on one hand, the stroke of the sealing ring arranged on the valve sleeve is too long in the assembling process, and the sealing ring is easy to damage after passing through a plurality of oil holes; on the other hand, the valve sleeve is provided with a plurality of sealing rings, so that the resistance in the installation process is large, the valve sleeve needs to be installed by using large force, the force is not easy to control, the installation speed of the valve sleeve is too high, and the sealing rings are damaged. Therefore, the spool with long oil sealing length is easy to deform under various working conditions, the radial fit clearance between the spool and the valve sleeve is difficult to guarantee, abnormal leakage with large leakage amount is generated, the annular clearance is sealed, the working pressure is higher, the internal leakage is larger, in addition, the sealing ring is easy to damage during installation, the time and the labor are consumed, the repeated times are large, and a large amount of manpower and time are consumed.

Disclosure of Invention

The invention aims to provide a large-diameter sectional valve core hydraulic control reversing valve with sensitive action, reliable reset and small leakage amount aiming at the problems of overlong length of a slide valve, deformation conditions under various working conditions and influence on fit clearance, so as to solve the problem that a seal ring is easily damaged in the installation process.

The invention solves the technical problem and adopts the technical scheme that the large-diameter sectional valve core hydraulic control reversing valve comprises: the assembly is at the smooth valve barrel and the case that 1 valve pocket of valve casing is axial displacement relatively the valve body to and the assembly is at valve body section of thick bamboo afterbody with the concentric spring case plug 6 that terminates of smooth valve barrel, its characterized in that: the slide valve sleeve and the valve core are segmented into a first slide valve core 3 and a second slide valve core 4 which do linear motion in the valve cavities of a first slide valve sleeve 2 and a second slide valve sleeve 5, linear array ring grooves which are separated and arranged by sealing rings are arranged on the circumference of the segmented valve sleeve, an H-shaped oil sealing section with two large ends and a small middle part similar to a connecting shaft of a dumbbell-shaped structure is manufactured on the segmented valve core, the oil sealing length of the dumbbell valve core platform oil section of the second slide valve core 4 is larger than or equal to the given oil sealing length value of the first slide valve sleeve 2, and the sum of the width distances of undercut grooves at the neck parts of the two dumbbell valve core platform valve cores is basically equal to the reversing distance; in the moving process of the valve core, the first slide valve core 3 is butted with the second slide valve core 4 and respectively makes linear motion in the cavity of the first slide valve sleeve 2 butted with the second slide valve sleeve 5, one of the lengths of two adjacent oil seals is reduced, the other one is inevitably increased, the pressure difference of a high-pressure cavity and a low-pressure cavity is formed, and the leakage amount of the annular gap is inversely proportional to the length of the oil seals according to hydrodynamics.

Compared with the prior art, the invention has the following beneficial effects:

the action is sensitive, and the reset is reliable. The valve core and the valve sleeve which are originally integrated are split into two sections, and the two sections of valve sleeves can be respectively installed from two ends of the valve shell installation hole, so that the reversing stroke of the sealing ring on the valve sleeve in the installation process is greatly shortened. The linear array ring grooves which are arranged in a separated mode through the sealing rings are arranged on the circumference of the sectional type valve sleeve, and therefore the risk of damage to the sealing rings during installation of the valve sleeve is greatly reduced. The two sections of valve cores are respectively matched with the corresponding valve sleeves in a grinding way, and the length is reduced, so that the matching grinding quality is improved. When the length of the slide valve is too long, the sectional structure of the slide valve core and the valve sleeve can realize the same function as the whole valve core after the two sections of valve cores are nested together in a special nesting mode, and the nesting mode only ensures that the two sections of valve cores move together along the respective axial direction, has sensitive action, can not mutually transmit radial deflection force, and avoids the clamping stagnation while realizing the function. According to the sectional type slide valve structure, the assembly return spring 7 is arranged in the plug hole body of the spring barrel, and the valve core can be flexibly moved to a working position after a reversing signal is sent out; the valve core can reset automatically after the reversing signal is removed, and the resetting is reliable. And (3) commutation stationarity: the pressure impact is small during reversing.

The leakage amount is small. The two valve cores are nested, the sum of the opening amount of the two valve ports and the length of one oil seal is reduced by the axial length compared with the original valve, and the problems that the length of a slide valve is too long and a sealing ring is easy to damage in the installation process are solved. The two valve cores can move along respective axial directions together, radial deflection can not be mutually transmitted, the nesting mode can ensure that the first sliding valve core 3 can move smoothly along the axial direction in the cavity of the first sliding valve sleeve 2 and can not be influenced by radial deflection of the second sliding valve core 4, the nesting mode can also ensure that the second sliding valve core 4 can move smoothly along the axial direction in the cavity of the second sliding valve sleeve 5 and can not be influenced by radial deflection of the first sliding valve core 3, the fit clearance between the valve cores and the valve sleeves can be improved, the leakage amount is reduced, the assembly efficiency can be improved, and the problem that a sealing ring is damaged by a long valve sleeve in the installation process is solved. The sectional type valve core is provided with the H-shaped oil sealing section of the connecting shaft with two large ends and a small middle part similar to a dumbbell structure, so that the weight of the valve is reduced, the volume efficiency is improved, the resistance loss is inversely proportional to the square of the opening amount, and the pressure loss is small.

Drawings

FIG. 1 is a cross-sectional view of a large-bore sectional spool pilot operated directional control valve of the present invention.

FIG. 2 is a three-dimensional view of a nested interface for two-piece spool connections.

In the figure: the valve comprises a valve shell 1, a first sliding valve sleeve 2, a first sliding valve core 3, a second sliding valve core 4, a second sliding valve sleeve 5, a spring cylinder plug 6, a return spring 7 and a valve core limiting seat 8.

The invention is further illustrated with reference to the figures and examples, but the invention is not limited thereby within the scope of the examples described. All such concepts are intended to be within the scope of the present disclosure and the present invention.

Detailed Description

Refer to fig. 1 and 2. In a preferred embodiment described below, a large-bore segmented spool pilot operated directional control valve includes: the valve comprises a sliding valve sleeve and a valve core which are assembled in a valve cavity of a valve shell 1 and move axially relative to a valve body, and a spring barrel plug 6 which is assembled at the tail part of a valve barrel and is concentrically connected with the sliding valve sleeve, wherein: the slide valve sleeve and the valve core are segmented into a first slide valve core 3 and a second slide valve core 4 which do linear motion in the valve cavities of a first slide valve sleeve 2 and a second slide valve sleeve 5, linear array ring grooves which are separated and arranged by sealing rings are arranged on the circumference of the segmented valve sleeve, an H-shaped oil sealing section with two large ends and a small middle part similar to a connecting shaft of a dumbbell-shaped structure is manufactured on the segmented valve core, the oil sealing length of the dumbbell valve core platform oil section of the second slide valve core 4 is larger than or equal to the given oil sealing length value of the first slide valve sleeve 2, and the sum of the width distances of undercut grooves at the neck parts of the two dumbbell valve core platform valve cores is basically equal to the reversing distance; in the moving process of the valve core, the first slide valve core 3 is butted with the second slide valve core 4 and respectively makes linear motion in the cavity of the first slide valve sleeve 2 butted with the second slide valve sleeve 5, one of the lengths of two adjacent oil seals is reduced, the other one is inevitably increased, the pressure difference of a high-pressure cavity and a low-pressure cavity is formed, and the leakage amount of the annular gap is inversely proportional to the length of the oil seals according to hydrodynamics.

The head ends of the first slide valve sleeve 2 and the second slide valve sleeve 5 are fixed in the valve cavity of the valve shell 1 by a spring barrel plug 6 and a valve core limit end cover 8 on the tail end.

The second slide valve core 4 is embedded with a rod end retaining ring through a radial opening retaining groove on the first slide valve core 3, is nested into a whole and is arranged in the valve cavity of the valve shell 1 from either end of the first slide valve sleeve 2 or the second slide valve sleeve 5.

See fig. 2. When the valve is installed, the rod end retaining ring of the second slide valve core 4 is embedded into the valve cavity of the valve housing 1 from either end of the first slide valve sleeve 2 or the second slide valve sleeve 5 through the radial opening retaining groove on the first slide valve core 3 and is nested into a whole.

While the present technology has been described above with reference to the accompanying drawings and examples, it is to be understood that the present technology is not limited to the specific implementations described above. If the conception and the technical scheme of the invention are adopted for insubstantial improvement or are not improved, the conception and the technical scheme of the invention are directly applied to other occasions and are within the protection scope of the technology of the invention.