Small-size high-frequency high-linearity jet flow deflection plate type electro-hydraulic servo valve

Abstract

The utility model discloses a small-size high-frequency high-linearity jet flow deflection plate type electro-hydraulic servo valve, and relates to the technical field of electro-hydraulic servo valves. The electromagnetic valve comprises a shell, a primary seat assembly, a coil assembly, a valve element and an armature assembly, an upper horizontal cavity and a lower horizontal cavity are formed in the shell, and the valve element is located in the lower horizontal cavity; the valve core comprises a valve core shaft, a left valve core floating sleeve and a right valve core floating sleeve; an annular groove is formed in the middle of the valve element shaft, a second left annular boss and a first left annular boss are sequentially arranged on the valve element shaft from the left end to the middle, and a second right annular boss and a first right annular boss are sequentially arranged on the valve element shaft from the right end to the middle. The valve core is divided into the valve core shaft and the valve core floating sleeve, and the pressure difference of the control cavity directly acts on the valve core floating sleeve and then is transmitted to the valve core shaft through the valve core floating sleeve, so that the valve core generates displacement; the shearing force of the valve core is improved by 1.8 times, and the shearing force, the reliability and the stability of the servo valve are improved to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of electro-hydraulic servo valves, and more specifically to a small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve. Background Art

[0002] With the advancement of science and technology, hydraulic servo systems are being used more and more widely, and the electro-hydraulic servo valve is an indispensable and very important component of the hydraulic servo system. Its static and dynamic performance directly affects the performance of the hydraulic servo system.

[0003] Since the successful research and application of the nozzle flapper electro-hydraulic servo valve in industrial, military and other fields, the stability of the hydraulic servo system has been greatly improved. However, the valve has very high requirements on the cleanliness of the working medium. If the working medium is slightly contaminated or the filtration accuracy is not high, the valve will be blocked and lose its working ability.

[0004] At the same time, the jet tube electro-hydraulic servo valve uses electric feedback, which increases the size of the valve and is not suitable for harsh environments such as humid environments. Although a small number of models use a force feedback structure (Servo Valve Department of Shanghai 704 Research Institute Hengtuo Industrial Development Co., Ltd., Special Lecture on Jet Tube Electro-hydraulic Servo Valve [J]. Hydraulics and Pneumatics, 2009 (11): 86-88.), its feedback rod is a single rod type, which is subjected to unbalanced force and affects the movement of the jet tube.

[0005] In summary, the following problems exist in the field of electro-hydraulic servo valves:

[0006] 1) The working medium has high requirements, the servo valve is easily blocked and has a short service life;

[0007] 2) The servo valve is large in size and weight, and has a narrow scope of use;

[0008] 3) Slow dynamic response and poor linearity;

[0009] 4) The shear force of the servo valve is small.

[0010] Therefore, it is necessary to develop a small-volume, high-frequency, and high-linearity jet deflection plate electro-hydraulic servo valve. Utility Model Content

[0011] The purpose of the utility model is to overcome the deficiencies of the above-mentioned background technology and to provide a small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve.

[0012] To achieve the above objectives, the technical solution of the present utility model is as follows: a small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve, comprising a housing, a first-stage seat assembly located on the housing, a coil assembly located on the first-stage seat assembly, a valve core, and an armature assembly; an upper horizontal cavity and a lower horizontal cavity are provided within the housing; a first jet hole, a first left receiving hole, a first right receiving hole, and a first center hole are provided on the upper surface of the housing; a first working oil hole, an oil return hole, a second working oil hole, and an oil supply hole are provided in the middle portion of the lower surface of the housing from left to right;

[0013] An oil filter and an oil filter plug located at the left end of the oil filter are provided in the upper horizontal cavity;

[0014] The valve core is located in the lower horizontal cavity;

[0015] The armature assembly includes a deflection plate feedback rod, an armature, and a spring tube. The armature is located at the top of the spring tube, and the deflection plate feedback rod is located at the bottom of the spring tube. The deflection plate feedback rod passes through the second center hole and the first center hole in sequence and is connected to the middle of the valve core.

[0016] The armature is located within the coil assembly;

[0017] The feature is that the valve core includes a valve core shaft, a left valve core floating sleeve arranged at the left end of the valve core shaft, and a left valve core floating sleeve arranged at the left end of the valve core shaft;

[0018] An annular groove is provided in the middle of the valve core shaft, and the valve core shaft is provided with two left annular bosses and a left annular boss in sequence from the left end to the middle, and the valve core shaft is provided with two right annular bosses and a right annular boss in sequence from the right end to the middle;

[0019] A left end surface control chamber is formed between the left valve core floating sleeve and the left end of the lower horizontal cavity, a left working chamber is formed between the left valve core floating sleeve and the left second annular boss, a left oil return chamber is formed between the left second annular boss and the left first annular boss, a central chamber is formed between the left first annular boss and the bottom of the right first annular boss, a right oil return chamber is formed between the right second annular boss and the right first annular boss, a right working chamber is formed between the right valve core floating sleeve and the right second annular boss, and a right end surface control chamber is formed between the right valve core floating sleeve and the right end of the lower horizontal cavity;

[0020] The diameters of the left second annular boss, the left first annular boss, the right second annular boss and the right first annular boss are equal; the diameters of the left valve core floating sleeve and the right valve core floating sleeve are equal, and the diameter of the left valve core floating sleeve is larger than the diameter of the left second annular boss;

[0021] The bottom of the deflection plate feedback rod is embedded in the annular groove.

[0022] In the above technical solution, the valve core shaft is 1 / 2-4 / 5 times the diameter of the left second annular boss.

[0023] In the above technical solution, the left valve core floating sleeve and the right valve core floating sleeve have an interference fit with the valve core shaft, and the interference is 0.002-0.004mm; the center line of the valve core shaft, the center line of the left valve core floating sleeve, the center line of the right valve core floating sleeve and the center line of the lower horizontal cavity are all on the same axis.

[0024] In the above technical solution, the diameter D1 of the left second annular boss is 6-9 mm, and the diameter D2 of the left valve core floating sleeve is 11 mm.

[0025] In the above technical solution, an upper left horizontal cavity is formed between the left end of the upper horizontal cavity and the oil filter plug, and an upper right horizontal cavity is formed between the oil filter plug and the right end of the upper horizontal cavity.

[0026] In the above technical solution, a left oblique oil passage and a right oblique oil passage are provided in the housing. One end of the left oblique oil passage is connected to the left end surface control cavity, and the other end is connected to the first left receiving hole through the upper right horizontal cavity; one end of the right oblique oil passage is connected to the right end surface control cavity, and the other end is connected to the first right receiving hole through the upper right horizontal cavity.

[0027] A left straight oil passage and a right straight oil passage are provided in the housing. One end of the left straight oil passage is communicated with the left working chamber, and the other end is communicated with the upper left horizontal chamber through the main straight oil passage. One end of the right straight oil passage is communicated with the right working chamber, and the other end is communicated with the upper left horizontal chamber through the main straight oil passage. The upper left horizontal chamber is communicated with the first jet hole.

[0028] In the above technical solution, the first-stage seat assembly includes a jet plate, a first-stage seat, an upper pressure block, a positioning pin, and a lower pressure block; the jet plate is provided with a second jet hole matching the first jet hole, a second left receiving hole matching the first left receiving hole, a second right receiving hole matching the first right receiving hole, and a second center hole matching the first center hole;

[0029] The jet sheet is located between the upper pressing block and the lower pressing block. The jet sheet, the upper pressing block and the lower pressing block are concentrically arranged. The positioning pins sequentially fix the upper pressing block, the jet sheet and the lower pressing block to the center of the first-level seat.

[0030] In the above technical solution, the left second annular boss, the left first annular boss, the right second annular boss and the right first annular boss each have a pressure equalizing groove, and the left valve core floating sleeve and the right valve core floating sleeve each have two pressure equalizing grooves.

[0031] In the above technical solution, a small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve has a volume no greater than 41.5 mm × 42.5 mm × 48.5 mm and a mass no greater than 260 g.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1) The utility model has the characteristics of long life, strong anti-pollution ability, high frequency response, high shear force, small size, light weight, high reliability, good stability, high linearity, low maintenance cost and reduced total cost.

[0034] 2) In the present invention, since the volume of the servo valve is too small, the valve sleeve has been integrated, and there is no extra space to thicken the valve core as a whole without increasing the overall volume. Therefore, the valve core is divided into a valve core shaft and a valve core floating sleeve. The control chamber pressure difference acts directly on the valve core floating sleeve, and then is transmitted to the valve core shaft through the valve core floating sleeve to cause the valve core to move. Compared with the traditional servo valve, the control chamber pressure difference acts directly on both ends of the valve core shaft. The shear force of the valve core of the present invention is increased by 1.8 times, which greatly improves the shear force, reliability and stability of the servo valve.

[0035] 3) In the present invention, the valve core and the housing are directly coupled, and the displacement of the valve core generates a feedback torque through the deflection plate feedback rod to return the deflection plate to zero position. The feedback force acts on the jet deflection plate. The valve sleeve is omitted in the structure, and all flow channels are integrated in the housing, which reduces the volume and weight, and effectively expands the scope of use of the present invention.

[0036] 4) The feedback lever of the jet deflector in the utility model adopts a double-arm shape, which overcomes the defect of uneven force of a single feedback lever and has high reliability and long service life.

[0037] 5) The valve core in the present invention is equipped with multiple control chambers, and multiple pressure-equalizing grooves are also opened on the boss. The diameter of the valve core itself is small, and the valve core shaft is 1 / 2-4 / 5 times the diameter of the left two annular bosses, which effectively reduces the weight, reduces the motion inertia, and improves the frequency response of the valve.

[0038] 6) The pressure oil of the utility model adjusts the flow direction of the oil circuit. The pressure oil is first filtered by the oil filter and then enters the armature assembly, the first-stage seat assembly, the housing, the valve core shaft and the valve core floating sleeve, thereby avoiding the stagnation and blockage at the jet plate and the contaminants from entering the movement gap between the valve core and the housing, thereby effectively improving the anti-pollution ability of the servo valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of the present utility model.

[0040] Figure 2 Schematic diagram of the structure of the jet sheet.

[0041] Figure 3 Schematic diagram of the structure of the upper horizontal cavity and the lower horizontal cavity.

[0042] Figure 4 A top view of the shell.

[0043] Figure 5It is a structural diagram of the valve core.

[0044] Figure 6 This is a structural diagram of the first-level seat.

[0045] Figure 7 It is a structural schematic diagram of the present invention when the armature of the armature assembly generates a clockwise force.

[0046] Figure 8 It is a structural schematic diagram of the present invention when the armature of the armature assembly generates a counterclockwise force.

[0047] Among them, 100-shell, 110-upper horizontal cavity, 111-oil filter, 112-oil filter plug, 113-upper left horizontal cavity, 114-upper right horizontal cavity, 120-lower horizontal cavity, 121-lower left horizontal cavity, 122-lower middle horizontal cavity, 123-lower right horizontal cavity, 131-first jet hole, 132-first left receiving hole, 133-first right receiving hole, 134-first center hole , 141-first working oil hole, 142-return oil hole, 143-second working oil hole, 144-oil supply hole, 151-left oblique oil channel, 152-right oblique oil channel, 153-left straight oil channel, 154-right straight oil channel, 155-main straight oil channel, 200-first stage seat assembly, 210-jet sheet, 211-second jet hole, 212-second left receiving hole, 213-second right receiving hole, 214- Second center hole, 220-first stage seat, 230-upper pressure block, 240-positioning pin, 250-lower pressure block, 300-coil assembly, 310-magnetic conductor, 400-valve core, 410-valve core shaft, 411-annular groove, 412-left second annular boss, 413-left first annular boss, 415-right first annular boss, 416-right second annular boss, 420-left valve core floating sleeve, 430-right Valve core floating sleeve, 450-threaded hole, 440-pressure equalizing groove, 500-armature assembly, 510-deflection plate feedback rod, 511-deflection plate, 512-small ball, 520-armature, 530-spring tube, 610-left end face control chamber, 620-left working chamber, 630-left oil return chamber, 640-center chamber, 650-right oil return chamber, 660-right working chamber, 670-right end face control chamber. DETAILED DESCRIPTION

[0048] The following detailed description of the implementation of the present invention is provided in conjunction with the accompanying drawings, which do not limit the present invention and are merely examples. The advantages of the present invention will become clearer and easier to understand through the description.

[0049] Referring to the accompanying drawings, a small-volume, high-frequency, high-linearity jet deflection plate electro-hydraulic servo valve is shown, comprising a housing 100, a first-stage seat assembly 200 located on the housing 100, a coil assembly 300 located on the first-stage seat assembly 200, a valve core 400, and an armature assembly 500. An upper horizontal cavity 110 and a lower horizontal cavity 120 are provided within the housing 100. A first jet orifice 131, a first left receiving orifice 132, a first right receiving orifice 133, and a first center orifice 134 are provided on the upper surface of the housing 100. A first working oil orifice 141, an oil return orifice 142, a second working oil orifice 143, and an oil supply orifice 144 are provided in the middle portion of the lower surface of the housing 100, sequentially from left to right.

[0050] The upper horizontal cavity 110 is provided with an oil filter 111 and an oil filter plug 112 located at the left end of the oil filter 111;

[0051] The valve core 400 is located in the lower horizontal cavity 120;

[0052] The armature assembly 500 includes a deflection plate feedback rod 510, an armature 520, and a spring tube 530. The armature 520 is located at the top of the spring tube 530, and the deflection plate feedback rod 510 is located at the bottom of the spring tube 530. The deflection plate feedback rod 510 passes through the second center hole 214 and the first center hole 134 in sequence to connect to the middle of the valve core 400.

[0053] The armature 520 is located inside the coil assembly 300;

[0054] The valve core 400 includes a valve core shaft 410, a left valve core floating sleeve 410 provided at the left end of the valve core shaft 410, and a left valve core floating sleeve 430 provided at the left end of the valve core shaft 410;

[0055] The valve core shaft 410 has an annular groove 411 in the middle, and the valve core shaft 410 has two left annular bosses 412 and a left annular boss 413 in sequence from the left end to the middle, and two right annular bosses 414 and a right annular boss 414 in sequence from the right end to the middle.

[0056] A left end surface control chamber 610 is formed between the left valve core floating sleeve 410 and the left end of the lower horizontal cavity 120, a left working chamber 620 is formed between the left valve core floating sleeve 410 and the left second annular boss 412, a left oil return chamber 630 is formed between the left second annular boss 412 and the left first annular boss 413, a central chamber 640 is formed between the left first annular boss 413 and the bottom of the right first annular boss 414, a right oil return chamber 650 is formed between the right second annular boss 414 and the right first annular boss 414, a right working chamber 660 is formed between the right valve core floating sleeve 430 and the right second annular boss 414, and a right end surface control chamber 670 is formed between the right valve core floating sleeve 43 and the right end of the lower horizontal cavity 120;

[0057] The first working oil hole 141 is coupled with the left working chamber 620 and the left return oil chamber 630, the return oil hole 142 is communicated with the central chamber 640, the second working oil hole 143 is coupled with the right return oil chamber 650 and the right working chamber 660, and the oil supply hole 144 is communicated with the left working chamber 620 and the right working chamber 660.

[0058] The diameters of the left second annular boss 412, the left first annular boss 413, the right second annular boss 414 and the right first annular boss 414 are equal; the diameters of the left valve core floating sleeve 420 and the right valve core floating sleeve 430 are equal, and the diameter of the left valve core floating sleeve 420 is larger than the diameter of the left second annular boss 412;

[0059] The bottom of the deflector plate feedback rod 510 is embedded in the annular groove 411 .

[0060] The valve core shaft 410 is 1 / 2-4 / 5 times the diameter of the left second annular boss 422.

[0061] The left valve core floating sleeve 420 and the right valve core floating sleeve 430 are interference fit with the valve core shaft 410, and the interference is 0.002-0.004mm; the center line of the valve core shaft 410, the center line of the left valve core floating sleeve 420, the center line of the right valve core floating sleeve 430 and the center line of the lower horizontal cavity 120 are all on the same axis.

[0062] The diameter D1 of the left second annular boss 412 is 6-8 mm, and the diameter D2 of the left valve core floating sleeve 420 is 11 mm.

[0063] An upper left horizontal cavity 113 is formed between the left end of the upper horizontal cavity 110 and the oil filter plug 112 , and an upper right horizontal cavity 114 is formed between the oil filter plug 112 and the right end of the upper horizontal cavity 11 .

[0064] The housing 100 includes a left oblique oil passage 151 and a right oblique oil passage 152. One end of the left oblique oil passage 151 communicates with the left end surface control chamber 610, and the other end communicates with the first left receiving hole 132 via the upper right horizontal chamber 114. The right oblique oil passage 152 communicates with the right end surface control chamber 670 at one end, and the other end communicates with the first right receiving hole 133 via the upper right horizontal chamber 114.

[0065] A left straight oil passage 153 and a right straight oil passage 154 are provided in the housing 100. One end of the left straight oil passage 153 is connected to the left working chamber 620, and the other end is connected to the upper left horizontal chamber 113 through the main straight oil passage 155. One end of the right straight oil passage 154 is connected to the right working chamber 66, and the other end is connected to the upper left horizontal chamber 113 through the main straight oil passage 155. The upper left horizontal chamber 113 is connected to the first jet hole 131.

[0066] The first-stage seat assembly 200 includes a jet plate 210, a first-stage seat 220, an upper pressing block 230, a positioning pin 240, and a lower pressing block 250. The jet plate 210 is provided with a second jet hole 211 matching the first jet hole 131, a second left receiving hole 212 matching the first left receiving hole 132, a second right receiving hole 213 matching the first right receiving hole 133, and a second center hole 214 matching the first center hole 134.

[0067] The jet sheet 210 is located between the upper pressing block 230 and the lower pressing block 250. The jet sheet 210, the upper pressing block 220 and the lower pressing block 250 are concentrically arranged. The positioning pin 240 fixes the upper pressing block 220, the jet sheet 210 and the lower pressing block 250 to the center of the first-stage seat 220 in sequence.

[0068] The left second annular boss 412 , the left first annular boss 413 , the right second annular boss 415 and the right first annular boss 414 each have a pressure equalizing groove 440 , and the left valve core floating sleeve 420 and the right valve core floating sleeve 430 each have two pressure equalizing grooves 440 .

[0069] A small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve has a volume no greater than 41.5 mm × 42.5 mm × 48.5 mm and a mass no greater than 260 g.

[0070] In actual use, the lower horizontal cavity 120 includes a lower left horizontal cavity 121, a lower middle horizontal cavity 122 and a lower right horizontal cavity 123 from left to right; the diameter D3 of the lower left horizontal cavity 121 is the same as the nominal size of the diameter of the left valve core floating sleeve 420, the diameter D4 of the lower middle horizontal cavity 122 is the same as the nominal size of the diameter of the left second annular boss 412, and the diameter D5 of the lower right horizontal cavity 123 is the same as the nominal size of the right valve core floating sleeve 430; the diameter of the lower left horizontal cavity 121 and the diameter of the lower right horizontal cavity 123 are larger than the diameter of the lower middle horizontal cavity 122.

[0071] There is a small ball 512 at the bottom end of the deflection plate feedback rod 510; the material of the small ball 512 is a high-elastic alloy, the surface of the small ball 512 is nitrided, and the coating thickness is 0.02-0.03mm; the nozzle of the deflection plate 511 is V-shaped, the large mouth of the V-shaped nozzle corresponds to the oil inlet hole of the servo valve, and the small mouth corresponds to the oil return hole. The material is a soft magnetic high-elastic alloy.

[0072] The width of the annular groove 411 is 0-0.01 mm larger than the diameter of the ball 512 , and the depth of the annular groove 411 is 0.6-1 times the diameter of the ball 512 .

[0073] Threaded holes 450 are provided on both the left valve core floating sleeve 420 and the right valve core floating sleeve 430 .

[0074] The armature 520 is perpendicular to the top of the spring tube 530 , and the two arms of the armature 520 are symmetrically located on both sides of the spring tube 530 .

[0075] The left working chamber 620 , the left oil return chamber 630 , the right working chamber 660 , and the right oil return chamber 650 are all symmetrically located on both sides of the central chamber 640 .

[0076] After the pressure oil in the upper horizontal cavity 110 is filtered by the oil filter 111, the oil path is divided into three directions. The first direction is connected to the first jet hole 131 of the housing 100. The pressure oil passes through the first jet hole 131 to the second jet hole 211 of the jet plate 210, and then passes through the nozzle of the deflector plate 511 to the second left receiving hole 212 and the second right receiving hole 213 of the jet plate 210. The second left receiving hole 212 and the second right receiving hole 213 are respectively connected to the first left receiving hole 132 and the first right receiving hole 133. The first left receiving hole 132 of the housing is connected to the left end surface control chamber 610, and the first right receiving hole 133 is connected to the right end surface control chamber 670.

[0077] The second direction communicates with the left working chamber 620 ; the third direction communicates with the right working chamber 660 .

[0078] like Figure 1 As shown, when the armature of the armature assembly 500 is not under force, the deflector plate 511 at the top of the deflector plate feedback rod 510 is in the middle position of the jet plate 210, and the pressurized oil ejected from the nozzle of the deflector plate 511 is evenly received by the second left receiving hole 212 and the second right receiving hole 213 of the jet plate 210, so that the pressures generated in the left end face control chamber 610 and the right end face control chamber 670 are equal. At this time, the valve core 400 is in the zero position, the first working oil hole 141 is blocked by the second left annular boss 422, and the second working oil hole 143 is blocked by the second right annular boss 426. The left working chamber 620, the first working oil hole 141, the oil return hole 142, the second working oil hole 143 and the right working chamber 660 are not connected to each other, and no oil is output;

[0079] like Figure 7As shown, when the armature of the armature assembly 500 generates a clockwise force, the deflection plate 511 on the top of the deflection plate feedback rod 510 deflects to the left at a small angle proportional to the force, and the nozzle of the deflection plate 511 ejects pressure oil toward the second left receiving hole 212 and the second right receiving hole 213. The second left receiving hole 212 receives more pressure oil than the second right receiving hole 213, so that the pressure generated by the left end face control chamber 610 is greater than the pressure generated by the right end face control chamber 670. The pressure difference between the left end face control chamber 610 and the right end face control chamber 670 pushes the valve core shaft 410 to move axially to the right; at this time, the left working chamber 620 is connected with the first working oil hole 141, the first working oil hole 141 is connected with the second working oil hole 143, and the second working oil hole 143 is connected with the return oil hole 142; the valve core shaft 420 moves axially to the right. The rightward movement causes the deflection plate feedback rod 510 to deform, which is fed back to the armature of the armature assembly 500 in the form of torque, balancing the electromagnetic torque generated by the armature. At this time, the deflection plate 511 returns to the zero position to the right, and the pressure difference between the left end face control chamber 610 and the end face control chamber 670 and the force of deformation of the deflection plate feedback rod 510 are balanced, so that the valve core shaft 410 and the output window hole form a stable opening, and the corresponding flow is output to generate a feedback torque that drives the deflection plate 511 to return to the zero position. The deflection plate 511 deflects to the right and returns to the zero position, making the flow rate of pressure oil entering the second left receiving hole 212 and the second right receiving hole 213 equal, and the pressure acting on the left end face control chamber 610 and the right end face control chamber 670 equal. At this time, the valve core shaft 410 is in a balanced position, and the pressure oil of corresponding flow rate and pressure is output to the outside.

[0080] like Figure 8As shown, when the armature of the armature assembly 500 generates a counterclockwise force, the deflection plate 511 on the top of the deflection plate feedback rod 510 deflects to the right by a small angle proportional to the force, and the nozzle of the deflection plate 511 ejects pressure oil toward the second left receiving hole 212 and the second right receiving hole 213. The pressure oil received by the second right receiving hole 213 is more than the pressure oil received by the second left receiving hole 212, so that the pressure of the right end face control chamber 670 is greater than the pressure of the left end face control chamber 610. The pressure difference between the right end face control chamber 670 and the left end face control chamber 610 pushes the valve core shaft 410 to move axially to the left; at this time, the left working chamber 620 is connected with the second working oil hole 143, the second working oil hole 143 is connected with the first working oil hole 141, and the first working oil hole 141 is connected with the return oil hole 142; the valve core shaft 420 moves axially to The left movement causes the deflection plate feedback rod 510 to deform, which is fed back to the armature of the armature assembly 500 in the form of torque, and is balanced with the electromagnetic torque generated by the armature. At this time, the deflection plate 511 returns to the zero position to the left, and the pressure difference between the right end face control chamber 670 and the left end face control chamber 610 is balanced with the force of deformation of the deflection plate feedback rod 510, so that the valve core shaft 410 and the output window hole form a stable opening, and the corresponding flow is output to generate a feedback torque that drives the deflection plate 511 to return to the zero position. The deflection plate 511 deflects to the left and returns to the zero position, so that the pressure oil flow entering the second left receiving hole 212 and the second right receiving hole 213 is equal, and the pressure acting on the left end face control chamber 610 and the right end face control chamber 670 are equal. At this time, the valve core shaft 410 is in a balanced position, and the pressure oil of corresponding flow and pressure is output to the outside.

[0081] The coil assembly 300 is composed of enameled wire and a bobbin. A magnet and a magnetic conductor 310 are mounted on the coil assembly 300. The magnet is made of an aluminum-nickel-cobalt permanent magnet alloy; the magnetic conductor 310 is made of an iron-nickel soft magnetic alloy. The housing 100 is made of high-carbon chromium stainless steel bearing steel; the valve core shaft 410 is also made of high-carbon chromium stainless steel bearing steel; and the left and right valve core floating sleeves are also made of high-carbon chromium stainless steel bearing steel.

[0082] In the present invention, the diameter D1 of the left second annular boss 412 is 6-8 mm, the diameter D2 of the left valve core floating sleeve 420 is 11 mm, and the driving force of the valve core 400 is calculated as:

[0083] F=△P·πD2 2 / 4

[0084] The traditional servo valve control chamber pressure difference acts directly on both ends of the valve core shaft, and its valve core 400 driving force F1=△P·πD1 2 / 4=50.24△P

[0085] The pressure difference of the control chamber of the utility model acts on both ends of the valve core floating sleeve, and the valve core 400 driving force F2=△P·πD2 2 / 4=94.985△P;

[0086] Where △P is the pressure difference in the control chamber.

[0087] From the above, it can be seen that by controlling the chamber pressure to act on the valve core floating sleeve and then on the valve core shaft 410, the shear force of the valve core 400 is increased by 1.8 times, which greatly improves the shear force, reliability and stability of the servo valve.

[0088] Other parts not described belong to the prior art.

Claims

1. A small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve, comprising a housing (100), a first-stage seat assembly (200) located on the housing (100), a coil assembly (300) located on the first-stage seat assembly (200), a valve core (400), and an armature assembly (500); an upper horizontal cavity (110) and a lower horizontal cavity (120) are provided in the housing (100); a first jet hole (131), a first left receiving hole (132), a first right receiving hole (133), and a first center hole (134) are provided on the upper surface of the housing (100); and a first working oil hole (141), an oil return hole (142), a second working oil hole (143), and an oil supply hole (144) are provided in sequence from left to right on the middle portion of the lower surface of the housing (100); An oil filter (111) and an oil filter plug (112) located at the left end of the oil filter (111) are provided in the upper horizontal cavity (110); The valve core (400) is located in the lower horizontal cavity (120); The armature assembly (500) comprises a deflection plate feedback rod (510), an armature (520) and a spring tube (530), wherein the armature (520) is located at the top end of the spring tube (530) and the deflection plate feedback rod (510) is located at the bottom end of the spring tube (530); the deflection plate feedback rod (510) passes through the second center hole (214) and the first center hole (134) in sequence and is connected to the middle of the valve core (400); The armature (520) is located in the coil assembly (300); Its characteristics are: The valve core (400) includes a valve core shaft (410), a left valve core floating sleeve (420) arranged at the left end of the valve core shaft (410), and a right valve core floating sleeve (430) arranged at the right end of the valve core shaft (410); The valve core shaft (410) is provided with an annular groove (411) in the middle, and the valve core shaft (410) is provided with two left annular bosses (412) and a left annular boss (413) in sequence from the left end to the middle, and the valve core shaft (410) is provided with two right annular bosses (415) and a right annular boss (414) in sequence from the right end to the middle; A left end face control chamber (610) is formed between the left valve core floating sleeve (420) and the left end of the lower horizontal cavity (120); a left working chamber (620) is formed between the left valve core floating sleeve (420) and the left second annular boss (412); a left oil return chamber (630) is formed between the left second annular boss (412) and the left first annular boss (413); a central chamber (640) is formed between the left first annular boss (413) and the bottom of the right first annular boss (414); a right oil return chamber (650) is formed between the right second annular boss (415) and the right first annular boss (414); a right working chamber (660) is formed between the right valve core floating sleeve (430) and the right second annular boss (415); and a right end face control chamber (670) is formed between the right valve core floating sleeve (430) and the right end of the lower horizontal cavity (120); The diameters of the left second annular boss (412), the left first annular boss (413), the right second annular boss (415) and the right first annular boss (414) are equal; the diameters of the left valve core floating sleeve (420) and the right valve core floating sleeve (430) are equal, and the diameter of the left valve core floating sleeve (420) is larger than the diameter of the left second annular boss (412); The bottom of the deflection plate feedback rod (510) is embedded in the annular groove (411).

2. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 1, characterized in that: The valve core shaft (410) is 1 / 2-4 / 5 times the diameter of the left second annular boss (412).

3. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 2, characterized in that: The left valve core floating sleeve (420) and the right valve core floating sleeve (430) are interference fit with the valve core shaft (410), and the interference is 0.002-0.004mm; the center line of the valve core shaft (410), the center line of the left valve core floating sleeve (420), the center line of the right valve core floating sleeve (430) and the center line of the lower horizontal cavity (120) are all on the same axis.

4. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 3, characterized in that: The diameter D1 of the left second annular boss (412) is 6-8 mm, and the diameter D2 of the left valve core floating sleeve (420) is 11 mm.

5. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 4, characterized in that: An upper left horizontal cavity (113) is formed between the left end of the upper horizontal cavity (110) and the oil filter plug (112), and an upper right horizontal cavity (114) is formed between the oil filter plug (112) and the right end of the upper horizontal cavity (110).

6. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 5, characterized in that: A left oblique oil passage (151) and a right oblique oil passage (152) are provided in the housing (100); one end of the left oblique oil passage (151) is communicated with the left end surface control chamber (610), and the other end is communicated with the first left receiving hole (132) through the upper right horizontal chamber (114); one end of the right oblique oil passage (152) is communicated with the right end surface control chamber (670), and the other end is communicated with the first right receiving hole (133) through the upper right horizontal chamber (114); A left straight oil passage (153) and a right straight oil passage (154) are provided in the housing (100). One end of the left straight oil passage (153) is communicated with the left working chamber (620), and the other end is communicated with the upper left horizontal chamber (113) through the main straight oil passage (155). One end of the right straight oil passage (154) is communicated with the right working chamber (660), and the other end is communicated with the upper left horizontal chamber (113) through the main straight oil passage (155). The upper left horizontal chamber (113) is communicated with the first jet hole (131).

7. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 6, characterized in that: The first-stage seat assembly (200) comprises a jet plate (210), a first-stage seat (220), an upper pressing block (230), a positioning pin (240), and a lower pressing block (250); the jet plate (210) is provided with a second jet hole (211) matching the first jet hole (131), a second left receiving hole (212) matching the first left receiving hole (132), a second right receiving hole (213) matching the first right receiving hole (133), and a second center hole (214) matching the first center hole (134); The jet sheet (210) is located between the upper pressing block (230) and the lower pressing block (250). The jet sheet (210), the upper pressing block (230) and the lower pressing block (250) are concentrically arranged. The positioning pin (240) sequentially fixes the upper pressing block (230), the jet sheet (210) and the lower pressing block (250) to the center of the first-stage seat (220).

8. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 7, characterized in that: The left second annular boss (412), the left first annular boss (413), the right second annular boss (415) and the right first annular boss (414) are each provided with a pressure equalizing groove (440), and the left valve core floating sleeve (420) and the right valve core floating sleeve (430) are each provided with two pressure equalizing grooves (440).

9. The small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve according to claim 8, characterized in that: A small-volume, high-frequency, high-linearity jet deflection plate type electro-hydraulic servo valve has a volume no greater than 41.5 mm × 42.5 mm × 48.5 mm and a mass no greater than 260 g.

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