Baffle and feedback rod integrated assembly for nozzle baffle type electro-hydraulic servo valve

Abstract

The utility model discloses a baffle and feedback rod integrated assembly for a nozzle baffle type electro-hydraulic servo valve, which comprises an overall cylindrical baffle and an overall conical feedback rod, the large end of the feedback rod is connected with the first end of the two ends of the baffle, the baffle and the feedback rod are integrally formed, and the feedback rod is connected with the baffle. Open grooves are formed in the outer walls of the two opposite sides of the baffle correspondingly, elastic pieces are formed, the ends, close to the feedback rod, of the open grooves and the two sides of the open grooves are open, and the ends, away from the feedback rod, of the open grooves are closed. According to the utility model, the baffle plate and the feedback rod adopt an integrated structure, so that the processing difficulty is obviously reduced, the production efficiency is improved, and the problem of oil leakage between the baffle plate and the feedback rod is completely eradicated; the open grooves are formed in the baffle to form the elastic pieces, so that the valve element and the valve sleeve have the flutter effect, the static friction force and the dynamic friction force between the valve element and the valve sleeve are reduced, the resolution ratio of the electro-hydraulic servo valve is improved, the hysteresis performance is improved, and the control precision is improved.

Description

Technical Field

[0001] The utility model relates to a component of a nozzle baffle type electro-hydraulic servo valve, in particular to an integrated baffle feedback rod assembly for the nozzle baffle type electro-hydraulic servo valve. Background Art

[0002] The electro-hydraulic servo valve is an important control element in the electro-hydraulic servo control system, and plays the role of electro-hydraulic conversion and power amplification in the system. Specifically, when the system is working, the electro-hydraulic servo valve directly receives the electrical signal transmitted by the system, and converts the electrical signal into a proportional signal with corresponding polarity that can control the load flow or load pressure of the electro-hydraulic servo valve, so that the system can output a larger hydraulic power to drive the corresponding actuator. The performance and reliability of the electro-hydraulic servo valve will directly affect the performance and reliability of the system, and it is a key component that attracts attention in the electro-hydraulic servo control system. The electro-hydraulic servo valve has the advantages of fast dynamic response, high control accuracy, and long service life. It has been widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, ships, metallurgy, and chemical industry.

[0003] Electro-hydraulic servo valves mainly include nozzle flapper type, jet tube type, and direct drive type. Among them, nozzle flapper type electro-hydraulic servo valve is the most widely used electro-hydraulic servo valve. The flapper and feedback rod are important components of the nozzle flapper type electro-hydraulic servo valve. The two are connected to each other and work together to control the amount of oil sprayed from the nozzle.

[0004] like Figure 1-Figure 3 As shown, the independent baffle 3 and the independent feedback rod 1 of the traditional nozzle baffle type electro-hydraulic servo valve are two independent precision parts. After being independently processed and formed, the large end of the conical independent feedback rod 1 is pressed into the inner hole of the cylindrical independent baffle 2 by interference contact to form an integral control component. The ball at the small end of the independent feedback rod 1 cooperates with the valve core of the electro-hydraulic servo valve (not shown in the figure) to transmit the feedback torque to the independent baffle 3. A section of the surface of the outer wall on the opposite sides of the cylindrical independent baffle 3 close to the independent feedback rod 1 is a baffle plane 2 used to cooperate with the inner wall of the nozzle (not shown in the figure) of the electro-hydraulic servo valve to realize the oil injection function.

[0005] The above-mentioned traditional nozzle baffle type electro-hydraulic servo valve has the following defects: First, the independent baffle 3 and the independent feedback rod 1 are independently processed and formed and then press-fitted and assembled. It is necessary to accurately control the dimensional error of the mating surface between the two to be extremely small (within 0.005), the roundness and cylindricity errors are extremely small (both within 0.001), and the roughness is extremely small (less than 0.4). The processing difficulty is very large and the processing time is also long. The interference between the two also needs to be controlled. If the interference is small, it is easy to loosen and fall off after press-fitting, and the reliability is low. If the interference is large, it may cause surface deformation of the independent baffle 3 after press-fitting or the independent feedback rod 1 to be bent. In actual processing, it is difficult to achieve the above-mentioned high-precision processing and assembly between the independent baffle 3 and the independent feedback rod 1, so there is often a problem of oil leakage between the independent baffle 3 and the independent feedback rod 1, that is, under high pressure environment, a small amount of hydraulic oil will still enter the independent feedback rod 1. The gap between the feed rod 3 and the independent baffle 1 and even through the gap affects the normal function of the independent baffle 3 and reduces the control accuracy of the electro-hydraulic servo valve; secondly, the independent baffle 3 of the traditional nozzle baffle type electro-hydraulic servo valve is a high-strength fixed structure without a flutter function. The valve core and the valve sleeve of the electro-hydraulic servo valve have no flutter effect. The static friction and dynamic friction between the valve core and the valve sleeve are large, resulting in the resolution of the electro-hydraulic servo valve being not high enough and the hysteresis performance being not ideal, which reduces the control accuracy of the electro-hydraulic servo valve to a certain extent. The traditional independent baffle 3 is a cylindrical structure with an inner hole and cannot be provided with an elastic sheet. If an elastic sheet is provided, the strength of the independent baffle 3 will be significantly reduced, resulting in a significant reduction in the reliability of its connection with the independent feedback rod 1, which cannot meet the normal working requirements. Therefore, it is impossible to improve the resolution of the electro-hydraulic servo valve and improve the hysteresis performance by providing an elastic sheet on the independent baffle 3. Utility Model Content

[0006] The purpose of the utility model is to solve the above problems and provide a baffle feedback rod integrated component for a nozzle baffle type electro-hydraulic servo valve which has high strength and elasticity and is integrally formed.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A baffle feedback rod integrated assembly for a nozzle baffle type electro-hydraulic servo valve, comprising an overall cylindrical baffle and an overall conical feedback rod, wherein the large end of the feedback rod is connected to the first end of the two ends of the baffle, the baffle and the feedback rod are integrally formed, and the outer walls on the opposite sides of the baffle are respectively provided with open grooves and form elastic sheets, and the end and both sides of the open groove close to the feedback rod are open and the end away from the feedback rod is closed.

[0009] Preferably, in order to cooperate with the inner wall of the nozzle of the electro-hydraulic servo valve to realize the oil injection function, the outer surfaces of the two elastic sheets are both provided with concave planes and the two concave planes are parallel to each other.

[0010] Preferably, in order to achieve a better vibration effect, an "L"-shaped step is formed at one end of the concave plane away from the feedback rod, and the closed end of the open groove is located between the "L"-shaped step and the second end of the baffle and close to the second end of the baffle.

[0011] Preferably, in order to achieve a better flutter effect, the distance between the inner concave plane and the corresponding opening groove is not greater than the thickness of the opening groove.

[0012] The beneficial effects of the utility model are:

[0013] The utility model adopts an integrally formed structure for the baffle plate and the feedback rod, and there is no need to consider the problem of precise matching between the baffle plate and the feedback rod and the problem of interference fit connection, thereby significantly reducing the difficulty of processing, improving production efficiency, and completely eliminating the problem of oil leakage between the baffle plate and the feedback rod; at the same time, the integrated structure between the baffle plate and the feedback rod makes it possible to process the elastic sheet on the baffle plate, and the elastic sheet is formed by arranging an open groove on the baffle plate, which will not affect the strength between the entire baffle plate and the feedback rod, and the elastic sheet will generate high-frequency flutter during operation, which is transmitted by the feedback rod so that the valve core and the valve sleeve of the electro-hydraulic servo valve have a flutter effect, the static friction and dynamic friction between the valve core and the valve sleeve are reduced, the resolution of the electro-hydraulic servo valve is improved, the hysteresis performance is improved, and the control accuracy of the electro-hydraulic servo valve is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of the connection between the independent flapper and the independent feedback rod of the traditional nozzle flapper type electro-hydraulic servo valve;

[0015] Figure 2 This is the front view of the traditional nozzle-flapper type electro-hydraulic servo valve after the independent flapper and the independent feedback rod are connected;

[0016] Figure 3 yes Figure 2 AA section view in;

[0017] Figure 4 It is a stereoscopic diagram of the integrated assembly of the flapper feedback rod for the nozzle flapper type electro-hydraulic servo valve of the utility model;

[0018] Figure 5 It is a front view of the integrated assembly of the flapper feedback rod for the nozzle flapper type electro-hydraulic servo valve of the utility model;

[0019] Figure 6 yes Figure 5 BB section view in. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] like Figure 4-Figure 6 As shown, the baffle feedback rod integrated assembly for the nozzle baffle type electro-hydraulic servo valve described in the utility model includes an overall cylindrical baffle 9 and an overall conical feedback rod 4, the large end of the feedback rod 4 is connected to the first end of the two ends of the baffle 9, the baffle 9 and the feedback rod 4 are formed as one piece, and the outer walls on the opposite sides of the baffle 9 are respectively provided with opening grooves 6 and elastic sheets 5 are formed, and the end and both sides of the opening groove 6 close to the feedback rod 4 are open, and the end away from the feedback rod 4 is closed.

[0022] Preferably, in order to cooperate with the inner wall of the nozzle of the electro-hydraulic servo valve (not shown in the figure) to realize the oil injection function, the outer surfaces of the two elastic sheets 5 are provided with an inner concave plane 7 and the two inner concave planes 7 are parallel to each other; in order to achieve a better vibration effect, an "L"-shaped step 8 is formed at one end of the inner concave plane 7 away from the feedback rod 4, and the closed end of the opening groove 6 is located between the "L"-shaped step 8 and the second end of the baffle 9 and close to the second end of the baffle 9; the distance between the inner concave plane 7 and the corresponding opening groove 6 is not greater than the thickness of the opening groove 6.

[0023] like Figure 4-Figure 6 As shown, when used, the baffle feedback rod integrated assembly of the utility model is connected to other components of the nozzle baffle type electro-hydraulic servo valve, and the connection method is the same as that of the traditional nozzle baffle type electro-hydraulic servo valve, which will not be repeated here; when working, there is no gap between the baffle 9 and the feedback rod 4, so the problem of oil leakage is completely eliminated; the elastic sheet 5 will produce high-frequency flutter during operation, and the valve core and valve sleeve (not shown in the figure) of the electro-hydraulic servo valve will have a flutter effect through the transmission of the feedback rod 4, and the static friction and dynamic friction between the valve core and the valve sleeve are reduced, thereby improving the resolution of the electro-hydraulic servo valve and improving the hysteresis performance, thereby improving the control accuracy of the electro-hydraulic servo valve.

[0024] Note: The above-mentioned baffle 9, feedback rod 4, and concave plane 7 correspond one-to-one with the independent baffle 3, independent feedback rod 1, and baffle plane 2 in the background technology content and have the same functions, but because the connection structure has changed, each component will change accordingly, so different component names and marking numbers are used.

[0025] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A baffle feedback rod integrated assembly for a nozzle baffle type electro-hydraulic servo valve, comprising an overall cylindrical baffle and an overall conical feedback rod, wherein the large end of the feedback rod is connected to the first end of the two ends of the baffle, and characterized in that: The baffle plate and the feedback rod are integrally formed, and the outer walls on opposite sides of the baffle plate are respectively provided with opening grooves and elastic sheets. The opening groove is open at one end close to the feedback rod and at both sides, and is closed at one end away from the feedback rod.

2. The integrated baffle feedback rod assembly for a nozzle baffle type electro-hydraulic servo valve according to claim 1, characterized in that: The outer side surfaces of the two elastic sheets are both provided with a concave plane, and the two concave planes are parallel to each other.

3. The integrated baffle feedback rod assembly for a nozzle baffle type electro-hydraulic servo valve according to claim 2, characterized in that: An "L"-shaped step is formed at one end of the concave plane away from the feedback rod, and the closed end of the open groove is located between the "L"-shaped step and the second end of the baffle and close to the second end of the baffle.

4. The integrated baffle feedback rod assembly for a nozzle baffle type electro-hydraulic servo valve according to claim 2 or 3, characterized in that: The distance between the inner concave plane and the corresponding opening groove is not greater than the thickness of the opening groove.

Images