Low-temperature hydraulic combined valve terminal

Abstract

The invention relates to a hydraulic combination valve terminal. The hydraulic combination valve terminal comprises a first valve body and a second valve body, wherein the middle of the first valve body is provided with a first cavity in the horizontal direction, a first control rod is installed in the first cavity, first springs are arranged between the end faces of the two sides of the first control rod and the end faces of the two sides of the first cavity, a first oil inlet channel is arranged between the bottom and the top of the first valve body, the first oil inlet channel communicates with the first cavity, and a second oil inlet channel is arranged between the bottom and the top of the second valve body. According to the hydraulic combination valve terminal disclosed by the invention, the first valve body, the second valve body and a third valve body of the three parts are assembled into the combined hydraulic combined valve terminal, the structure of the combined hydraulic combined valve terminal is reliable, and the accuracy and the stability of the pressure value of a hydraulic valve can be ensured.

Description

technical field [0001] The invention relates to a low-temperature hydraulic valve, in particular to a hydraulic combined valve island. Background technique [0002] Hydraulic valve islands essentially belong to a new class of electro-hydraulic integrated control components. Common hydraulic valve island materials include titanium alloy (TC4), aluminum alloy (AlSi10Mg), stainless steel (316L), die steel (1.2709), etc. However, based on product density, the best choice is to use lightweight aluminum alloy. The aluminum alloy hydraulic valve island used as a small hydraulic integrated system is especially suitable for military equipment transmission systems that need to reduce weight, thereby providing a stable source of hydraulic pressure. With the large demand for lightweight low-temperature valve islands in various industries and military industries, it is necessary to provide hydraulic valve island products with stable quality and reliable structure under low temperature c...

AI Technical Summary

Problems solved by technology

However, the current aluminum alloy hydraulic valve still has some difficulties in meeting the extreme working performance, especially in low temperature conditions (when the ambient temperature is lower than -20°C or even lower than -40°C).

[0003] Specifically, the current aluminum alloy hydraulic valve island has the following defects: slow response when working in a low temperature environment (usually refers to the ambient temperature below -20°C) (for example, the response is sluggish after being powered on at low temperature, and the delay after starting the motor is 2- The pressure starts to rise and become unstable in about 3s); the valve island is prone to leakage (at this time, the elasticity of the seal decreases, for example, ordinary nitrile rubber NBR generally has a low temperature resistance limit of -20°C); the flow rate measured by the flow sensor in a low temperature environment The error is large (the reaction of coil electrification is lagging); the oil thickens at low temperature, which makes the pumped flow rate low, resulting in unstable set pressure

In addition, because hydraulic valves need to withstand high and low temperature conversion, thermal expansion and contraction can cause deformation of the components themselves, such as changes in the size of the valve body and spool parts, which can easily lead to interrelated dimensions between parts (such as fit gaps) It will also change, which affects the performance of the entire hydraulic component (such as leakage, spool stuck, etc.)

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