Hydraulic amplifier structure of servo valve

Abstract

The invention relates to the technical field of electro-hydraulic servo valves, in particular to a servo valve hydraulic amplifier structure which comprises an armature assembly and a first-stage seat, a through hole is formed in the middle of the first-stage seat, the armature assembly I is installed on the upper surface of the first-stage seat through a spring tube, and a cylindrical boss is arranged at the lower end of the spring tube and located in the round through hole in the middle of the first-stage seat. A belleville spring is placed below the cylindrical boss of the spring tube, the small end of the belleville spring is in contact with the end face of the cylindrical boss of the spring tube, an upper pressing block is arranged below the belleville spring in a contact mode, a jet piece is arranged below the upper pressing block in a contact mode, a lower pressing block is arranged below the jet piece in a contact mode, and the upper pressing block, the jet piece and the lower pressing block are connected and positioned through positioning pins. The armature assembly sequentially penetrates through the spring tube, the upper pressing block, the jet piece and the lower pressing block, the upper pressing block, the jet piece and the lower pressing block are arranged in the through hole from top to bottom, the sealing ring is arranged between a cylindrical boss at the lower end of the spring tube and the round through hole in the middle of the first-stage base, and the environment performance and the service performance of the jet amplifier can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of electro-hydraulic servo valves, and in particular to a servo valve hydraulic amplifier structure. Background Art

[0002] Servo valves are widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, navigation, etc. The common two-stage electro-hydraulic servo valve is mainly composed of a pilot stage and a slide valve stage. The jet deflection plate amplifier is a commonly used servo valve pilot stage structure. The jet amplifier provided in the invention patent CN107725519B "Small volume, high frequency, high linearity jet deflection plate electro-hydraulic servo valve and its use method" is composed of a conventional armature assembly and a first-stage seat assembly, wherein the conventional first-stage seat assembly includes an upper pressure block, a lower pressure block, a jet sheet, a locating pin, and a first-stage seat. Generally, the armature assembly is installed on the first-stage seat assembly, and the first-stage seat assembly is installed on the housing. During long-term use, it is found that due to high temperature deformation, vibration causing screw loosening and other working conditions, the performance of the jet amplifier of the above conventional structure will be extremely unstable, which seriously affects the performance of the servo valve. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a servo valve hydraulic amplifier structure, including a through hole set on the first-stage seat, a cylindrical boss set at the bottom of the spring tube, and the upper and lower pressure blocks and the jet plate are pressed together by designing a disc spring to improve the environmental performance and service performance of the jet amplifier.

[0004] In order to achieve the above-mentioned purpose, the servo valve amplifier structure provided by the present invention adopts the following technical solutions:

[0005] A servo valve hydraulic amplifier structure, comprising: an armature assembly, a primary seat, a sealing ring, a disc spring, an upper pressure block, a lower pressure block, a jet sheet, a first positioning pin, and a second positioning pin;

[0006] The first-stage seat is cylindrical, with a circular through hole in the middle and two threaded holes on the upper surface. The armature assembly is installed on the upper surface of the first-stage seat through two threaded clearance holes on the spring tube. A cylindrical boss is provided at the lower end of the spring tube and the cylindrical boss is in the circular through hole in the middle of the first-stage seat. A disc spring is placed below the cylindrical boss of the spring tube. The small end of the disc spring contacts the end surface of the cylindrical boss of the spring tube. An upper pressure block is placed below the disc spring. The upper pressure block is cylindrical and has a third pin hole and a sixth pin hole. A jet sheet is placed below the upper pressure block. The jet sheet is Cylindrical, provided with a second pin hole and a fifth pin hole, a lower pressing block is placed under the jet sheet, the lower pressing block is cylindrical, provided with a first pin hole and a fourth pin hole, the first locating pin passes through the first pin hole on the lower pressing block, the second pin hole on the jet sheet, and the third pin hole on the upper pressing block in sequence, the second locating pin passes through the fourth pin hole on the lower pressing block, the fifth pin hole on the jet sheet, and the sixth pin hole on the upper pressing block in sequence, the first locating pin and the second locating pin have the same structure and are in a conical shape, and the sealing ring is placed in the gap area formed between the cylindrical boss at the lower end of the spring tube and the circular through hole in the middle of the first-stage seat;

[0007] Furthermore, the outer circle of the upper pressing block and the inner hole of the first-stage seat have a clearance fit, and the clearance value is between 0.001mm and 0.002mm; the outer circle of the jet sheet and the inner hole of the first-stage seat have a clearance fit, and the clearance value is between 0.001mm and 0.002mm; the outer circle of the lower pressing block and the inner hole of the first-stage seat have an interference fit, and the interference value is between 0 and 0.002mm;

[0008] Furthermore, the first pin hole on the lower pressing block has the same size as the second pin hole on the jet sheet and the third pin hole on the upper pressing block, and they are completely coaxial; the fourth pin hole on the lower pressing block has the same size as the fifth pin hole on the jet sheet and the sixth pin hole on the upper pressing block, and they are completely coaxial;

[0009] Further, the large diameter end of the first locating pin has an interference fit with the first pin hole of the lower pressing block, the interference value is 0.001-0.003mm, the middle section of the first locating pin has a clearance fit with the second pin hole of the jet plate, the small diameter end of the first locating pin has a clearance fit with the third pin hole of the upper pressing block, the large diameter end of the second locating pin has an interference fit with the fourth pin hole of the lower pressing block, the interference value is 0.001-0.003mm, the middle section of the second locating pin has a clearance fit with the fifth pin hole of the jet plate, and the small diameter end of the second locating pin has a clearance fit with the sixth pin hole of the upper pressing block;

[0010] Furthermore, the sum of the height of the cylindrical boss at the lower end of the spring tube and the free height of the disc spring, the thickness of the upper pressure block, the thickness of the jet sheet, and the thickness of the lower pressure block is greater than the depth of the circular through hole in the middle of the first-stage seat, so as to ensure that the disc spring is always in a compressed state and the lower pressure block protrudes a certain distance from the lower surface of the first-stage seat;

[0011] Furthermore, the cylindrical boss at the lower end of the spring tube is coaxial with the circular through hole in the middle of the first-stage seat;

[0012] Compared with the existing servo valve hydraulic amplifier structure, the present invention has the following advantages:

[0013] (1) Increase the preload of the disc spring. In high temperature environment, when the spring tube screw is loose, the upper and lower pressure blocks and the jet plate can still be completely close together, and the lower pressure block can still protrude from the lower surface of the first-stage seat, ensuring that there will be no oil leakage between the oil inlet, oil return port and two load ports on the lower pressure block;

[0014] (2) The positioning pin adopts a conical structure, which can not only perform interference constraint positioning on the lower pressing block, but also ensure that the jet sheet will not be over-positioned, further improving the stability of the jet sheet jet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the amplifier structure;

[0016] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part B;

[0017] Figure 3 It is a schematic diagram of the ejector structure;

[0018] Figure 4 It is a schematic diagram of the spring tube structure;

[0019] Figure 5 This is a schematic diagram of the first-level seat structure. DETAILED DESCRIPTION

[0020] In order to more intuitively and clearly describe the structural principles and working methods in the examples of the present invention, the embodiments will be introduced in conjunction with relevant drawings. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] An embodiment of the present invention provides a servo valve hydraulic amplifier structure, which improves the spring tube in a conventional armature assembly and the first-stage seat, positioning pin and combination thereof in a first-stage seat assembly, including changing the first-stage seat into a through hole, adding a cylindrical boss to the bottom of the spring tube, and adding a disc spring to press the upper and lower pressure blocks and the jet plate, so as to improve the environmental performance and service performance of the jet amplifier.

[0022] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0023] A servo valve hydraulic amplifier structure, such as Figure 1 ,2 , 3, 4, including: armature assembly I, primary seat 3, sealing ring 2, disc spring 4, upper pressure block 5, lower pressure block 7, jet sheet 6, first positioning pin 8, second positioning pin 9;

[0024] The first-stage seat 3 is cylindrical, with a circular through hole 3.1 in the middle and two threaded holes 3.2 on the upper surface. The armature assembly I is installed on the upper surface of the first-stage seat 3 through two threaded clearance holes on the spring tube 1. A cylindrical boss 1.1 is provided at the lower end of the spring tube 1 and the cylindrical boss 1.1 is in the circular through hole 3.1 in the middle of the first-stage seat 3. A disc spring 4 is placed below the cylindrical boss 1.1 of the spring tube 1. The small end of the disc spring 4 contacts the end face of the cylindrical boss 1.1 of the spring tube 1. An upper pressing block 5 is placed below the disc spring 4. The upper pressing block 5 is cylindrical and has a third pin hole 5.1 and a sixth pin hole 5.2. A jet sheet 6 is placed below the upper pressing block 5. The jet sheet 6 is cylindrical. A second pin hole 6.1 and a fifth pin hole 6.2 are provided, and a lower pressing block 7 is placed under the jet sheet 6 in contact therewith. The lower pressing block 7 is cylindrical and is provided with a first pin hole 7.2 and a fourth pin hole 7.1. The first positioning pin 8 passes through the first pin hole 7.2 on the lower pressing block 7, the second pin hole 6.1 on the jet sheet 6, and the third pin hole 5.1 on the upper pressing block 5 in sequence. The second positioning pin 9 passes through the fourth pin hole 7.1 on the lower pressing block 7, the fifth pin 6.2 on the jet sheet 6, and the sixth pin hole 5.2 on the upper pressing block 5 in sequence. The first positioning pin 8 and the second positioning pin 9 have the same structure and are in a conical shape. The sealing ring 2 is placed in the gap area formed between the cylindrical boss 1.1 at the lower end of the spring tube 1 and the circular through hole 3.1 in the middle of the first-stage seat 3;

[0025] Furthermore, the outer circle of the upper pressing block 5 has a clearance fit with the circular through hole 3.1 in the middle of the first-stage seat 3, and the clearance value is between 0.001mm and 0.002mm; the outer circle of the jet sheet 6 has a clearance fit with the circular through hole 3.1 in the middle of the first-stage seat 3, and the clearance value is between 0.001mm and 0.002mm; the outer circle of the lower pressing block 7 has an interference fit with the circular through hole 3.1 in the middle of the first-stage seat 3, and the interference value is between 0 and 0.002mm;

[0026] Furthermore, the first pin hole 7.2 on the lower pressing block 7 has the same aperture size as the second pin hole 6.1 on the jet sheet 6 and the third pin hole 5.1 on the upper pressing block 5, and is completely coaxial; the fourth pin hole 7.1 on the lower pressing block 7 has the same aperture size as the fifth pin hole 6.2 on the jet sheet 6 and the sixth pin hole 5.2 on the upper pressing block 5, and is completely coaxial;

[0027] Further, the large diameter end of the first locating pin 8 has an interference fit with the first pin hole 7.2 of the lower pressing block 7, and the interference value is 0.001-0.003mm, the middle section of the first locating pin 8 has a clearance fit with the second pin hole 6.1 of the jet plate 6, and the small diameter end of the first locating pin 8 has a clearance fit with the third pin hole 5.1 of the upper pressing block 5, the large diameter end of the second locating pin 9 has an interference fit with the fourth pin hole 7.1 of the lower pressing block 7, and the interference value is 0.001-0.003mm, the middle section of the second locating pin 9 has a clearance fit with the fifth pin hole 6.2 of the jet plate 6, and the small diameter end of the second locating pin 9 has a clearance fit with the sixth pin hole 5.2 of the upper pressing block 5;

[0028] Furthermore, the sum of the height of the cylindrical boss 1.1 at the lower end of the spring tube 1 and the free height of the disc spring 4, the thickness of the upper pressure block 5, the thickness of the jet sheet 6, and the thickness of the lower pressure block 7 is greater than the depth of the circular through hole 3.1 in the middle of the first-stage seat 3, so as to ensure that the disc spring 4 is always in a compressed state and the lower pressure block 7 protrudes a certain distance from the surface of the first-stage seat 3;

[0029] Furthermore, the cylindrical boss 1.1 at the lower end of the spring tube 1 is coaxial with the circular through hole 3.1 in the middle of the first-stage seat 3;

[0030] Compared with the existing servo valve hydraulic amplifier structure, the present invention has the following advantages:

[0031] (1) Increase the preload of the disc spring. In high temperature environment, when the spring tube screw is loose, the upper and lower pressure blocks and the jet plate can still be completely close together, and the lower pressure block can still protrude from the lower surface of the first-stage seat, ensuring that there will be no oil leakage between the oil inlet, oil return port and two load ports on the lower pressure block;

[0032] (2) The positioning pin adopts a conical structure, which can not only perform interference constraint positioning on the lower pressing block, but also ensure that the jet sheet will not be over-positioned, further improving the stability of the jet sheet jet.

[0033] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A servo valve hydraulic amplifier structure, characterized in that: include: An armature assembly and a primary seat, wherein a through hole is provided in the middle of the primary seat, and the armature assembly I is installed on the upper surface of the primary seat through a spring tube, and a cylindrical boss is provided at the lower end of the spring tube and the cylindrical boss is in the circular through hole in the middle of the primary seat, and a disc spring is placed below the cylindrical boss of the spring tube, and the small end of the disc spring contacts with the end face of the cylindrical boss of the spring tube, and an upper pressure block is placed below the disc spring, a jet sheet is placed below the upper pressure block, and a lower pressure block is placed below the jet sheet, and the upper pressure block, the jet sheet and the lower pressure block are connected and positioned by locating pins, and the armature assembly passes through the spring tube and the upper pressure block, the jet sheet and the lower pressure block arranged in the through hole from top to bottom in sequence, and a sealing ring is arranged between the cylindrical boss at the lower end of the spring tube and the circular through hole in the middle of the primary seat.

2. A servo valve hydraulic amplifier structure according to claim 1, characterized in that: The first-stage seat is cylindrical and has two threaded holes on its upper surface. The armature assembly I is installed on the first-stage seat through two threaded clearance holes on the spring tube and the threaded holes on the first-stage seat. The upper pressure block is cylindrical and has a third pin hole and a sixth pin hole. The jet sheet is cylindrical and has a second pin hole and a fifth pin hole. The lower pressure block is cylindrical and has a first pin hole and a fourth pin hole. The first locating pin passes through the first pin hole on the lower pressure block, the second pin hole on the jet sheet, and the third pin hole on the upper pressure block in sequence. The second locating pin passes through the fourth pin hole on the lower pressure block, the fifth pin on the jet sheet, and the sixth pin hole on the upper pressure block in sequence.

3. A servo valve hydraulic amplifier structure according to claim 1, characterized in that: The first positioning pin and the second positioning pin have the same structure and are in a conical shape.

4. A servo valve hydraulic amplifier structure according to claim 1, characterized in that: The outer circle of the upper pressing block has a clearance fit with the through hole of the first-stage seat, and the clearance value is between 0.001mm and 0.002mm. The outer circle of the jet sheet has a clearance fit with the through hole of the first-stage seat, and the clearance value is between 0.001mm and 0.002mm. The outer circle of the lower pressing block has an interference fit with the through hole of the first-stage seat, and the interference value is between 0 and 0.002mm.

5. The servo valve hydraulic amplifier structure according to claim 1, characterized in that: The first pin hole on the lower pressing block has the same aperture size as the second pin hole on the jet plate and the third pin hole on the upper pressing block, and is completely coaxial. The fourth pin hole on the lower pressing block has the same aperture size as the fifth pin hole on the jet plate and the sixth pin hole on the upper pressing block, and is completely coaxial.

6. A servo valve hydraulic amplifier structure according to claim 3, characterized in that: The large diameter end of the first locating pin has an interference fit with the first pin hole of the lower pressure block, and the interference value is 0.001 to 0.003 mm. The middle section of the first locating pin has a clearance fit with the second pin hole of the jet plate. The small diameter end of the first locating pin has a clearance fit with the third pin hole of the upper pressure block. The large diameter end of the second locating pin has an interference fit with the fourth pin hole of the lower pressure block, and the interference value is 0.001 to 0.003 mm. The middle section of the second locating pin has a clearance fit with the fifth pin hole of the jet plate. The small diameter end of the second locating pin has a clearance fit with the sixth pin hole of the upper pressure block.

7. A servo valve hydraulic amplifier structure according to claim 2, characterized in that: The sum of the height of the cylindrical boss at the lower end of the spring tube, the free height of the disc spring, the thickness of the upper pressure block, the thickness of the jet sheet, and the thickness of the lower pressure block is greater than the depth of the circular through hole in the middle of the first-stage seat to ensure that the disc spring is always in a compressed state and the lower pressure block protrudes a certain distance from the lower surface of the first-stage seat.

8. The servo valve hydraulic amplifier structure according to claim 2, characterized in that: The cylindrical boss at the lower end of the spring tube is coaxial with the circular through hole in the middle of the first-stage seat.

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