Pre-stage performance testing device for electro-hydraulic servo valve

Abstract

The utility model belongs to the technical field of electro-hydraulic servo valves, and particularly discloses an electro-hydraulic servo valve prestage performance testing device which comprises a shell assembly, an oil filter assembly, an oil inlet throttling hole assembly, an oil return throttling hole assembly and a sensor assembly. The oil filter assemblies are symmetrically installed in the shell assembly, an oil inlet throttling hole assembly is arranged between the two oil filter assemblies, and two oil inlet channels are formed in the shell assembly and communicated with the two oil filter assemblies respectively. The shell assembly is further provided with an oil return channel and a test channel for installing the sensor assembly. The oil return throttling hole assembly is installed in the shell oil return channel and communicated with the pre-stage oil return cavity. The test channel is communicated with the two control cavities of the prestage; an oil outlet hole of the oil inlet throttling hole assembly is communicated with the pre-stage oil inlet cavity; and the flow is distributed by the prestage and then enters a test channel. The testing device provided by the utility model shortens the development period of products and reduces the development cost by testing pre-stage parameters in advance.

Description

Technical Field

[0001] The utility model belongs to the technical field of electro-hydraulic servo valves, in particular to a pre-stage performance testing device for electro-hydraulic servo valves. Background Art

[0002] The electro-hydraulic servo valve is a key control component in the electro-hydraulic servo system, performing electro-hydraulic conversion and power amplification within the system. It is widely used in defense and military applications such as aviation, aerospace, and shipbuilding. The pre-stage of the electro-hydraulic servo valve is the first stage of electro-hydraulic conversion and power amplification. It can be a jet deflector-type first-stage hydraulic amplifier or a nozzle-flapper-type first-stage hydraulic amplifier. The jet deflector-type first-stage hydraulic amplifier consists of a jet disc and a deflector. The jet disc is designed with a fixed nozzle orifice and two fixed receiving orifices. The outlet oil passages of the receiving orifices communicate with the two load chambers of the hydraulic test bench through two oil passages in the housing assembly. The first-stage hydraulic amplifier of the nozzle-flapper stage consists of a return oil throttle orifice, two fixed throttle orifices, and two variable throttle orifices in the nozzle-flapper. The outlet oil passages of the nozzle chamber communicate with the two load chambers of the hydraulic test bench through the housing assembly. Regarding the torque motor part, the two types of component structures are basically the same. The difference is that the armature assembly of the nozzle baffle type is designed as an integral part of the baffle, while the armature assembly of the jet deflector is designed as an integral part of the deflector. The movement of the armature assembly directly drives the movement of the baffle or the deflector.

[0003] Electro-hydraulic servo valves are currently widely used in servo systems. With short product development cycles, providing users with stable and reliable servo valves in a short timeframe is crucial. Simulation calculations can proactively identify issues in forward design, a common method for successful product development. However, the actual flow patterns in the servo valve's pre-stage are extremely complex, making accurate modeling and solving them nearly impossible. Therefore, it is necessary to design a test device to obtain the performance parameters of the electro-hydraulic servo valve's pre-stage. Utility Model Content

[0004] Purpose of the utility model: In order to solve the above problems, the purpose of the utility model is to provide an electro-hydraulic servo valve pre-stage performance testing device, which uses an external testing device to obtain the pressure and flow output parameters of the electro-hydraulic servo valve pre-stage.

[0005] In order to achieve the above object, the utility model provides a performance test device for the pre-stage of an electro-hydraulic servo valve, the test device comprising: a housing assembly, an oil filter assembly, an oil inlet throttle assembly, an oil return throttle assembly, and a sensor assembly;

[0006] The oil filter assemblies are symmetrically mounted in the housing assembly, an oil inlet throttle assembly is disposed between the two oil filter assemblies, and the housing assembly is provided with two oil inlet passages, each connected to the two oil filter assemblies; the housing assembly is also provided with an oil return passage and a test passage for installing a sensor assembly;

[0007] The oil return throttle hole assembly is installed in the oil return channel of the housing, and the oil return throttle hole assembly is communicated with the pre-stage oil return chamber;

[0008] The test channel is connected to the two control chambers of the pre-stage; the oil outlet of the oil inlet throttle hole assembly is connected to the oil inlet chamber of the pre-stage; and the oil enters the test channel after flow distribution through the pre-stage.

[0009] Furthermore, the two oil inlet channels on the housing assembly are symmetrically distributed in a V shape.

[0010] Furthermore, the oil inlet throttle hole assembly consists of an oil inlet throttle hole and a sealing ring. The oil inlet throttle hole includes two oil inlet ends and an oil outlet hole arranged in the middle; the sealing ring is arranged in a sealing groove opened at positions symmetrical to both sides of the oil outlet hole.

[0011] Furthermore, the oil return throttle hole assembly is composed of an oil return throttle hole, a sealing ring, and an oil filter seat; the oil return throttle hole is pressed into the inner cavity of the oil filter seat; and the sealing ring is installed in the outer sealing groove of the oil filter seat.

[0012] Furthermore, the oil filter assembly is fixed in the oil passage of the housing assembly through a certain number of rubber pads and plugs.

[0013] Furthermore, the test channel is also connected to a flow meter to collect the flow after distribution.

[0014] Working Principle: This test device housing assembly incorporates an oil filter with a specified filtration accuracy to protect the pre-stage. The oil inlet and return orifice assemblies are equipped with serialized orifices. By matching various parameters, the forward design optimizes the performance characteristics of the electro-hydraulic servo valve pre-stage.

[0015] When the control current signal is input into the coil assembly, the control magnetic flux formed between the coil assembly, the magnetizer, and the armature is coupled with the polarization magnetic flux formed between the magnets, forming an electromagnetic torque to control the armature assembly to rotate around the rotation center of the spring tube, thereby realizing the angular displacement output of the deflector plate or baffle, and further realizing the proportional relationship between the output pressure difference of the pre-stage and the input current signal.

[0016] The beneficial effects of the present invention are as follows: the present invention screens the matching of the pre-stage parameters of the electro-hydraulic servo valve, and adopts an auxiliary test device in advance to obtain the pre-stage characteristics: the curve relationship between the pre-stage pressure difference and the input signal current; the pre-stage pressure, the pre-stage flow; the pre-stage stability and reliability are ensured through screening, etc. This test device has extremely high application value for the forward design of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The main view of the structure of this utility model;

[0018] Figure 2 A side view of the structure of the utility model;

[0019] Figure 3 Rear view of the structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the throttle assembly of the utility model;

[0021] Among them, 1-prestage torque motor, 2-prestage first stage seat assembly, 3-oil filter assembly, 4-oil inlet throttle hole assembly, 5-sensor assembly, 6-oil return throttle hole assembly. DETAILED DESCRIPTION

[0022] In order to more intuitively and clearly describe the structural principles in the examples of the present invention, the embodiments will be introduced below 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.

[0023] like Figures 1 to 3 As shown, an embodiment of the present invention provides an electro-hydraulic servo valve pre-stage performance test device, comprising an oil filter assembly 3, an oil inlet orifice assembly 4, a sensor assembly 5, an oil return orifice assembly 6, and a housing assembly. The housing assembly serves as the mounting carrier for the entire test device and is provided with an oil inlet channel, an oil return channel, and a test channel for mounting the sensor assembly 5. Oil filter assemblies 3 are mounted on both sides of the oil inlet orifice assembly 4. The oil filter assemblies 3 communicate with the oil inlet channels of the housing assembly. Hydraulic oil entering the test device is filtered by the oil filter assembly 3 before entering the oil inlet orifice assembly 4 and then entering the pre-stage first seat assembly 2. The flow is distributed by a jet plate, and the distributed hydraulic oil enters the test channels of the housing assembly. The sensor assembly 5 in the test channel can collect the hydraulic oil pressure in real time and can also collect the distributed hydraulic oil flow rate through an external flowmeter. The oil return orifice assembly 6 is mounted in the housing oil return channel and communicates with the pre-stage oil return chamber.

[0024] During assembly, to better secure the oil filter assembly 3, one end of the oil filter assembly 3 is connected to the oil inlet orifice assembly 4, and the other end is secured via a plug and an end cap. Simultaneously, to better secure the oil return orifice assembly 6, one end of the oil return orifice assembly 6 is connected to the oil return hole of the housing assembly, and the other end is secured via a plug and an end cap.

[0025] like Figure 4 The figure shows a schematic diagram of the structure of an oil inlet throttle orifice assembly specifically designed by the present invention. The orifice is integrally formed, with both ends of the orifice connected to the oil filter assembly 3 via rubber pads. An annular groove is formed in the middle of the orifice, and a small oil outlet hole is formed within the groove to ensure that the throttled hydraulic oil passes through the pre-stage oil inlet chamber. Seal grooves for mounting sealing rings are also provided on both sides of the annular groove. In specific applications, the test device proposed by the present invention can be adapted to a series of orifice assemblies with different aperture sizes. By matching different parameters, the performance characteristics of the electro-hydraulic servo valve pre-stage can be optimized during forward design: the relationship between the pre-stage pressure difference and the input signal current; the pre-stage pressure; the pre-stage flow rate; and the stability and reliability of the pre-stage can be ensured through screening.

[0026] This utility model uses an auxiliary test device to pre-qualify the parameters of the electro-hydraulic servo valve's pre-stage, pre-testing the pre-stage characteristics. These include the curve relationship between the pre-stage pressure difference and the input signal current, the pre-stage pressure, and the pre-stage flow rate. This screening ensures the stability and reliability of the pre-stage. This test device is highly valuable for product forward design. By pre-testing the pre-stage parameters, the product development cycle is shortened and development costs are reduced.

[0027] The above specific implementation methods or cases are only used to explain the technical solutions of the utility model and are not intended to limit the present application. Any parts not described in detail are regarded as conventional technical means or common knowledge in the field. It can be understood by ordinary technicians in this field that: based on the design concept of the present application, it should be possible to adaptively modify the technical solutions recorded in the aforementioned implementation methods, or to replace some or all of the technical features therein by equivalents. These modifications, equivalent replacements, and adaptively improved technical solutions do not depart from the technical essence of the utility model and should all be covered by the protection scope of the present application.

Claims

1. A performance test device for the pre-stage of an electro-hydraulic servo valve, characterized in that: The testing device includes: a housing assembly, an oil filter assembly, an oil inlet throttle assembly, an oil return throttle assembly, and a sensor assembly; The oil filter assembly is symmetrically mounted in the housing assembly, and an oil inlet throttle hole assembly is provided between the two oil filter assemblies; The housing assembly is provided with two oil inlet channels, which are connected to the two oil filter assemblies respectively; the housing assembly is also provided with an oil return channel and a test channel for installing the sensor assembly; An oil return throttle hole assembly, the oil return throttle hole assembly being installed in the oil return passage of the housing and being in communication with the pre-stage oil return chamber; The test channel is connected to the two control chambers of the pre-stage; the oil outlet of the oil inlet throttle hole assembly is connected to the oil inlet chamber of the pre-stage; and the oil enters the test channel after flow distribution through the pre-stage.

2. The electro-hydraulic servo valve pre-stage performance test device according to claim 1, characterized in that: The two oil inlet channels on the housing assembly are symmetrically distributed in a V shape.

3. The electro-hydraulic servo valve pre-stage performance test device according to claim 1, characterized in that: The oil inlet throttle hole assembly consists of an oil inlet throttle hole and a sealing ring. The oil inlet throttle hole includes two oil inlet ends and an oil outlet hole arranged in the middle; the sealing ring is arranged in a sealing groove opened at positions symmetrical to both sides of the oil outlet hole.

4. The electro-hydraulic servo valve pre-stage performance test device according to claim 3, characterized in that: One end of the oil filter assembly is connected to the oil inlet throttle hole assembly, and the other end is fastened by a plug and an end cover.

5. The electro-hydraulic servo valve pre-stage performance test device according to claim 1, characterized in that: The oil return throttle hole assembly consists of an oil return throttle hole, a sealing ring, and an oil filter seat; the oil return throttle hole is pressed into the inner cavity of the oil filter seat; and the sealing ring is installed in the sealing groove on the periphery of the oil filter seat.

6. The electro-hydraulic servo valve pre-stage performance test device according to claim 5, characterized in that: One end of the oil return throttling hole assembly is connected to the oil return hole of the shell assembly, and the other end is fastened by a plug and an end cover.

7. The electro-hydraulic servo valve pre-stage performance test device according to claim 1, characterized in that: The oil filter assembly is fixed in the oil passage of the housing assembly through a certain number of rubber pads and plugs.

8. The electro-hydraulic servo valve pre-stage performance test device according to claim 1, characterized in that: The test channel is also connected to a flow meter for collecting the flow after the pre-stage distribution.

Images