CN112240319A

CN112240319A - Efficient hydraulic servo valve

Info

Publication number: CN112240319A
Application number: CN202011100920.2A
Authority: CN
Inventors: 何泽兵
Original assignee: Individual
Current assignee: GUANGZHOU BAIYUN HYDRAULIC MACHINERY PLANT CO Ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-01-19
Anticipated expiration: 2040-10-15
Also published as: CN112240319B

Abstract

The invention discloses a high-efficiency hydraulic servo valve, which relates to the field of hydraulic servo valves and comprises a valve body of the hydraulic servo valve, and a feedback rod, a baffle, a nozzle and a filter which are arranged in the valve body, wherein a check valve is fixedly arranged on a liquid outlet of the nozzle, and the check valve can only supply high-pressure oil to be unidirectionally sprayed to the baffle from the liquid outlet of the nozzle. The check valve can prevent the possibility that eddy flow and cavitation are generated near the baffle and flow back into the liquid outlet pipe orifice of the nozzle again, so that the liquid outlet quantity supplied by the wheel of high-pressure oil is ensured, the error of the input quantity of the hydraulic servo valve is greatly reduced, and the powerful effect of continuously ensuring the precision of the input quantity can be achieved; the flow guide structure is helpful for reducing the disturbance frequency and amplitude of the baffle to a certain extent, so that the stability of the oil output pressure can be ensured.

Description

Efficient hydraulic servo valve

Technical Field

The invention relates to the field of hydraulic servo valves, in particular to a high-efficiency hydraulic servo valve.

Background

The hydraulic servo valve is a hydraulic control valve with output quantity and input quantity in a certain functional relation and can respond quickly, and is an important element of a hydraulic servo system. The existing hydraulic servo valve mainly comprises a torque motor component, a nozzle, a throttling baffle, a valve body, a valve core and the like.

After the high-pressure oil is sprayed out of the nozzle, vortex and cavitation can be generated near the baffle, when the relevant control signal for controlling the nozzle to discharge the liquid finishes the action of stopping liquid spraying, the vortex and cavitation generated near the baffle can flow back into the liquid outlet pipe orifice of the nozzle again, so that the liquid discharge amount supplied by the high-pressure oil cannot be ensured, and the condition of causing the input amount error of the hydraulic servo valve can be caused.

Disclosure of Invention

The present invention is directed to a high efficiency hydraulic servo valve to solve the above problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-efficiency hydraulic servo valve comprises a valve body of the hydraulic servo valve, a feedback rod, a baffle, a nozzle and a filter, wherein the feedback rod, the baffle, the nozzle and the filter are arranged in the valve body;

the position of the baffle is provided with a flow guide structure for reducing the degree of eddy and cavitation generated near the baffle when the nozzle sprays liquid;

the filter is detachably connected to the inner lower part of the valve body through a mounting piece.

As a further scheme of the invention: the water conservancy diversion structure includes the guide plate of the symmetry that the baffle both sides set up, and the lower part of guide plate is vertical plane, and the upper portion of guide plate is towards the crooked portion of bending that forms of the direction that corresponds the nozzle, and the top side of the portion of bending is a little higher than the outlet side of nozzle, and the inboard of the portion of bending forms the cambered surface that is used for exporting nozzle spun high pressure fluid downwards.

As a further scheme of the invention: the lower straight surface of the guide plate is connected to the corresponding surface of the baffle plate through a rubber pad in a hot-pressing manner.

As a further scheme of the invention: the one end of connecting the connecting rod is rotated at the middle part of bending of guide plate, and the other end of connecting rod rotates the one end of link connection slider, slider sliding connection is in the corresponding surface of baffle, and the middle part of slider is seted up and is supplied vertical slide shaft to run through gliding through-hole, and the both ends fixed connection of slide shaft is in the corresponding surface of fixed block, and the parallel fixed connection of two fixed block symmetries corresponds the surface at the baffle, the slider is established on the slide shaft with the both ends that still contradict buffer spring and cluster on the opposite face of the fixed block that is located the top simultaneously.

As a further scheme of the invention: the installed part includes the ghost cylinder, ghost cylinder fixed connection is in the valve body of the outside department of filter one end, the ghost cylinder is the hollow cylinder that both ends were sealed, but be provided with a lateral shifting's removal cone in the ghost cylinder, what remove the cone is the round platform form, and the heavy-calibre end shaping of round platform form is cylindric, and the global ejector pin one end that is provided with a plurality of edges and can remove the global gliding of cone that removes of cone is removed to the global of removing the cone, and the other end of ejector pin runs through and wraps up there is the elastic block from the perforation that ghost cylinder lateral wall was seted up.

As a further scheme of the invention: the middle part of the movable cone is provided with a second penetrating cavity for the screw rod shaft to penetrate through, the middle part of the second penetrating cavity is fixedly connected with a threaded block, the middle part of the threaded block is in threaded connection with the screw rod shaft, one end of the screw rod shaft is rotatably connected with the inner side surface of the hollow shell cylinder, the other end of the screw rod shaft penetrates through the other side surface of the hollow shell cylinder and is fixedly connected with a knob, the upper side and the lower side of the movable cone are further provided with first penetrating cavities for the slide rods to penetrate through, and the two ends of the slide rods are fixedly connected to the opposite side surfaces of the.

As a further scheme of the invention: and the large-caliber outer side edge of the movable cone is fixedly connected with an upper baffle plate used for preventing the corresponding ejector rod from sliding out of the movable cone.

As a further scheme of the invention: and the outer side edge of the small caliber of the movable cone is fixedly connected with a lower baffle sheet used for preventing the corresponding ejector rod from sliding out of the movable cone.

As a further scheme of the invention: the bottom end of the ejector rod is rotatably connected with a roller through a wheel shaft, and the roller is connected to the outer surface of the movable cone in a rolling mode.

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

1. the one-way valve is additionally arranged, so that after the high-pressure oil is sprayed out from the nozzle, vortex and cavitation can be generated near the baffle, when the action of stopping spraying liquid is finished by a related control signal for controlling the liquid outlet of the nozzle, the possibility that the vortex and the cavitation are generated near the baffle and flow back into the liquid outlet pipe orifice of the nozzle again can be prevented due to the existence of the one-way valve, the liquid outlet quantity supplied by the wheel of high-pressure oil is ensured, the error of the input quantity of the hydraulic servo valve is greatly reduced, and the powerful effect can be achieved by continuously ensuring the precision of the input quantity.

2. According to the invention, the cambered surface for guiding the high-pressure oil sprayed by the nozzle downwards is formed on the inner side of the bent part at the lower part of the guide plate, and when the cambered surface has the advantage compared with a plane, when the cambered surface is subjected to the high-pressure oil directly sprayed from the nozzle, the sputtering condition towards the periphery generated when the oil directly rushes to the plane can be relieved, and the impact oil is guided downwards in a gentle manner by virtue of the cambered surface, so that the degrees of eddy and cavitation generated near the baffle are reduced, the disturbance frequency and amplitude of the baffle are reduced to a certain extent, and the stability of the output pressure of the oil is ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is a schematic view of the construction of the mounting member of the present invention;

figure 4 is a partial schematic view of a mount according to the present invention.

In the figure: 1. a valve body; 2. a feedback lever; 3. a baffle plate; 4. a nozzle; 5. a filter; 6. a mounting member; 7. a one-way valve; 8. a baffle; 9. a rubber pad; 10. a bending part; 11. a fixed block; 12. a spring; 13. a slider; 14. a slide shaft; 15. a connecting rod; 16. a hollow shell cylinder; 17. a lower baffle sheet; 18. a thread block; 19. a first lumen; 20. perforating; 21. a second puncture cavity; 22. a screw shaft; 23. a knob; 24. a slide bar; 25. a blocking piece is arranged; 26. a top rod; 27. an elastic block; 28. a wheel axle; 29. a roller; 30. the cone is moved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, in the embodiment of the present invention, a high-efficiency hydraulic servo valve includes a valve body 1 of the hydraulic servo valve, and a feedback rod 2, a baffle 3, a nozzle 4 and a filter 5 which are arranged in the valve body 1, a check valve 7 is fixedly mounted on a liquid outlet of the nozzle 4, the check valve 7 can only allow high-pressure oil to be unidirectionally sprayed from the liquid outlet of the nozzle 4 to the baffle 3, the check valve 7 is additionally mounted to prevent the vortex and cavitation from being generated near the baffle 3 after the high-pressure oil is sprayed from the nozzle 4, when a related control signal for controlling the liquid outlet of the nozzle 4 finishes a liquid spraying action, and the existence of the check valve 7 can prevent the vortex and cavitation from being generated near the baffle 3 and flowing back into the nozzle 4 again, so as to ensure the liquid outlet amount of the high-pressure oil supply, and greatly reduce an error of an input amount of the hydraulic servo valve, therefore, the method can play a powerful effect in continuously ensuring the precision of the input quantity;

a flow guide structure for reducing the degree of eddy and cavitation generated near the baffle 3 when the nozzle 4 sprays liquid is arranged at the position of the baffle 3;

the filter 5 is detachably connected to the lower part in the valve body 1 through a mounting piece 6.

Further, the flow guide structure comprises symmetrical flow guide plates 8 arranged on two sides of the baffle 3, the lower parts of the flow guide plates 8 are vertical and planar, so that high-pressure oil can be guided down towards related oil passages in the valve body 1, the upper parts of the flow guide plates 8 are bent towards the direction corresponding to the nozzles 4 to form bending parts 10, the top sides of the bending parts 10 are slightly higher than the outlet sides of the nozzles 4, and the inner sides of the bending parts 10 form arc surfaces for guiding the high-pressure oil sprayed by the nozzles 4 downwards, when the arc surfaces are compared with the advantages of the planes, when the arc surfaces are subjected to the high-pressure oil directly sprayed by the nozzles 4, the sputtering condition towards the periphery generated when the oil directly rushes to the planes can be relieved, the impact oil can be guided downwards in a gentle mode by virtue of the arc surfaces, so that the vortex and the cavitation degree generated near the baffle 3 is reduced, and the disturbance frequency and, thereby ensuring the stability of the output pressure of the oil.

Furthermore, the lower straight surface of the guide plate 8 is connected with the corresponding surface of the baffle plate 3 through a rubber pad 9 in a hot-pressing manner, so that the guide plate 8 and the baffle plate 3 can be effectively fixed together, the complex procedure in production caused by a welding mode is avoided, and the difficulty in production and processing is simplified; and the rubber pad 9 can also undertake the buffering purpose to guide plate 8 of certain degree to can improve the cushioning effect when guide plate 8 receives high-pressure fluid and assaults.

Further, the middle part of the bending part 10 of the guide plate 8 is rotatably connected with one end of a connecting rod 15, the other end of the connecting rod 15 is rotatably connected with one end of a sliding block 13, the sliding block 13 is slidably connected with the corresponding surface of the baffle plate 3, a through hole for a vertical sliding shaft 14 to pass through and slide is formed in the middle part of the sliding block 13, two ends of the sliding shaft 14 are fixedly connected with the corresponding surfaces of the fixed blocks 11, the two fixed blocks 11 are symmetrically and parallelly and fixedly connected with the corresponding surface of the baffle plate 3, meanwhile, the opposite surfaces of the sliding block 13 and the fixed blocks 11 positioned above are also abutted against two ends of the buffer spring 12 and are serially connected on the sliding shaft 14, so that when the bending part 10 of the guide plate 8 is subjected to high-pressure oil directly ejected by the nozzle 4, the bending part 10 is subjected to a small displacement toward one side of the baffle plate 3 by impact force, meanwhile, the connecting rod 15 pushes the corresponding sliding, therefore, the buffering effect on the bent part 10 is realized in the process, the range and the strength during sputtering are further reduced, the disturbance frequency and the amplitude of the baffle 3 are further reduced, oil is reduced to be transmitted to the valve core, the displacement fluctuation condition of the valve core is reduced, and the stability of the oil output pressure is continuously ensured.

Further, the mounting member 6 includes a hollow cylinder 16, the hollow cylinder 16 is fixedly connected to the valve body 1 at the outer portion of one end of the filter 5, the hollow cylinder 16 is a hollow cylinder with two sealed ends, a movable cone 30 capable of moving transversely is disposed in the hollow cylinder 16, the movable cone 30 is in a circular truncated cone shape, the large-caliber end of the circular truncated cone shape is formed into a cylindrical shape, the circumferential surface of the movable cone 30 is provided with one end of a plurality of push rods 26 capable of sliding along the circumferential surface of the movable cone 30, and the other end of the push rods 26 penetrates through a through hole 20 formed in the side wall of the hollow cylinder 16 and is wrapped with an elastic block 27, so that the extension of the plurality of push rods 26 towards the outer side can be realized through the movable cone 30 capable of moving transversely until the push rods tightly abut against the inner circumferential portion of the filter 5, thereby quickly realizing the positioning and the dismounting of the filter 5 in the valve body 1 and facilitating the operation, and can satisfy the stability in the use process.

Further, a second through cavity 21 for the screw shaft 22 to penetrate through is formed in the middle of the movable cone 30, a threaded block 18 is fixedly connected to the middle of the second through cavity 21, the screw shaft 22 is in threaded connection with the middle of the threaded block 18, one end of the screw shaft 22 is rotatably connected to one inner side surface of the hollow shell cylinder 16, the other end of the screw shaft 22 penetrates through the other side surface of the hollow shell cylinder 16 and is fixedly connected with a knob 23, first through cavities 19 for the sliding rods 24 to penetrate through are further formed in the upper side and the lower side of the movable cone 30, two ends of the sliding rods 24 are fixedly connected to opposite side surfaces of the hollow shell cylinder 16, and therefore the purpose that the movable cone 30 transversely moves in the hollow shell cylinder 16 can be achieved by rotating the screw shaft 22.

Still further, the outer side of the large diameter of the movable cone 30 is fixedly connected with an upper baffle 25 for preventing the corresponding ejector rod 26 from slipping out of the movable cone 30, so that when the ejector rod 26 is located on the peripheral surface of the large diameter of the movable cone 30, the ejector rod 26 extends outwards to the maximum distance, and the filter 5 is assembled.

Still further, the lower stop 17 for preventing the corresponding push rod 26 from slipping out of the moving cone 30 is fixedly connected to the outer side of the small caliber of the moving cone 30, and when the push rod 26 is located on the circumference of the small caliber of the moving cone 30, the push rod 26 retracts into the hollow shell cylinder 16, so that the filter 5 is conveniently detached.

Still further, the bottom end of the top bar 26 is rotatably connected with a roller 29 through a wheel shaft 28, the roller 29 is connected to the outer surface of the movable cone 30 in a rolling manner, and the movable cone 30 can be converted into the vertical movement of the top bar 26 when moving transversely.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A high-efficiency hydraulic servo valve comprises a valve body (1) of the hydraulic servo valve, and a feedback rod (2), a baffle (3), a nozzle (4) and a filter (5) which are arranged in the valve body (1), and is characterized in that a check valve (7) is fixedly arranged on a liquid outlet of the nozzle (4), and the check valve (7) can only supply high-pressure oil to be unidirectionally sprayed to the baffle (3) from the liquid outlet of the nozzle (4);

a flow guide structure for reducing the degree of eddy and cavitation generated near the baffle (3) when the nozzle (4) sprays liquid is arranged at the position of the baffle (3);

the filter (5) is detachably connected to the inner lower part of the valve body (1) through a mounting piece (6).

2. The high-efficiency hydraulic servo valve as claimed in claim 1, wherein the flow guiding structure comprises symmetrical flow guiding plates (8) arranged on two sides of the baffle (3), the lower parts of the flow guiding plates (8) are vertical and planar, the upper parts of the flow guiding plates (8) are bent towards the corresponding nozzles (4) to form bending parts (10), the top sides of the bending parts (10) are slightly higher than the outlet sides of the nozzles (4), and the inner sides of the bending parts (10) form cambered surfaces for guiding high-pressure oil sprayed from the nozzles (4) downwards.

3. A high efficiency hydraulic servo valve as claimed in claim 2, wherein the lower straight face of the deflector (8) is hot pressed against the corresponding surface of the baffle (3) by means of a rubber pad (9).

4. The high-efficiency hydraulic servo valve as claimed in claim 2, wherein the middle of the bending part (10) of the guide plate (8) is rotatably connected with one end of a connecting rod (15), the other end of the connecting rod (15) is rotatably connected with one end of a sliding block (13), the sliding block (13) is slidably connected with the corresponding surface of the baffle (3), a through hole for the vertical sliding shaft (14) to slide through is formed in the middle of the sliding block (13), two ends of the sliding shaft (14) are fixedly connected with the corresponding surfaces of the fixed blocks (11), the two fixed blocks (11) are symmetrically, parallelly and fixedly connected with the corresponding surface of the baffle (3), and meanwhile, the sliding block (13) and the opposite surface of the fixed block (11) above are also abutted against two ends of the spring (12) and are serially connected with the sliding shaft (14).

5. The high-efficiency hydraulic servo valve as claimed in claim 1, wherein the mounting member (6) comprises a hollow cylinder (16), the hollow cylinder (16) is fixedly connected to the valve body (1) at the outer portion of one end of the filter (5), the hollow cylinder (16) is a hollow cylinder with two sealed ends, a movable cone (30) capable of moving transversely is arranged in the hollow cylinder (16), the movable cone (30) is in a circular truncated cone shape, the large-caliber end of the circular truncated cone shape is formed into a cylindrical shape, the circumferential surface of the movable cone (30) is provided with one end of a plurality of ejector rods (26) capable of sliding along the circumferential surface of the movable cone (30), and the other end of the ejector rod (26) penetrates through a through hole (20) formed in the side wall of the hollow cylinder (16) and is wrapped with an elastic block (27).

6. The high-efficiency hydraulic servo valve as claimed in claim 5, wherein a second through cavity (21) through which the screw shaft (22) penetrates is formed in the middle of the movable cone (30), a threaded block (18) is fixedly connected to the middle of the second through cavity (21), the screw shaft (22) is threadedly connected to the middle of the threaded block (18), one end of the screw shaft (22) is rotatably connected to one inner side surface of the hollow shell cylinder (16), the other end of the screw shaft (22) penetrates through the other side surface of the hollow shell cylinder (16) and is fixedly connected with a knob (23), first through cavities (19) through which the slide bars (24) slide are formed in the upper and lower sides of the movable cone (30), and two ends of the slide bars (24) are fixedly connected to opposite side surfaces of the hollow shell cylinder (16).

7. A high efficiency hydraulic servo valve as claimed in claim 5, wherein the large diameter outer side of the moving cone (30) is fixedly connected with a top stop (25) for preventing the corresponding carrier rod (26) from sliding out of the moving cone (30).

8. A high efficiency hydraulic servo valve as claimed in claim 5, wherein the small diameter outer side of the moving cone (30) is fixedly connected with a lower stop (17) for preventing the corresponding carrier rod (26) from sliding out of the moving cone (30).

9. A high efficiency hydraulic servo valve as claimed in claim 5 wherein the lower end of the ram (26) is rotatably connected to a roller (29) by a wheel shaft (28) and the roller (29) is rotatably connected to the outer surface of the moving cone (30).