A valve post-compensating system with pressure limiting function

Abstract

The application relates to the technical field of valve post compensation principles, in particular to a valve post compensation system with pressure limiting function, which comprises a damping one, a damping two, a hydraulic control reversing valve, a main valve core, a check valve, a compensation valve core, a pressure limiting signal generator one, a pressure limiting signal generator two and a damping three, the hydraulic control reversing valve controls the oil inlet of the main valve core, the hydraulic control port is connected with the pressure limiting signal generator and T, the reversing of the hydraulic control reversing valve is controlled by the pressure limiting signal generator, the main valve core is connected with the hydraulic control reversing valve, the compensation valve core, the check valve, A / B working oil ports and an oil return channel T, controls the oil inlet and return of the A / B working ports, the pressure limiting signal generator one and the pressure limiting signal generator two are respectively connected with the damping three, the damping one, the hydraulic control reversing valve and the damping two, the application controls the on-off of the oil inlet channel of the single-connection working piece through a mechanical structure, uses small flow to limit pressure, and the excess flow can also be used in other connection work, so that a more green and energy-saving working mode is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valve post compensation principles, in particular to a valve post compensation system with pressure limiting function. BACKGROUND

[0002] In the system of the valve post compensation principle, due to the structure limitation of the valve post compensation working piece, it is difficult to take the single working oil port signal oil, if the small flow pressure limiting function is added to the existing structure, in most cases, the single working oil port direct unloading or direct overflow principle is adopted, oil liquid to the working port is directly discharged to the oil return channel T, the direct discharge scheme has large energy loss and is not conducive to the future development direction.

[0003] In view of the above, the application provides a valve post compensation system with pressure limiting function to solve the above problems. SUMMARY

[0004] The application aims to provide a valve post compensation system with pressure limiting function to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0006] A valve post compensation system with pressure limiting function comprises a damping one, a damping two, a hydraulic control reversing valve, a main valve core, a check valve, a compensation valve core, a pressure limiting signal generator one, a pressure limiting signal generator two and a damping three, the hydraulic control reversing valve controls the oil inlet of the main valve core, the reversing of the hydraulic control reversing valve is controlled by the pressure limiting signal generator, the main valve core is connected with the hydraulic control reversing valve, the compensation valve core, the check valve, A / B working oil ports and an oil return channel T, and controls the oil inlet and return of the A / B working ports, the pressure limiting signal generator one and the pressure limiting signal generator two are connected with the damping three, the damping one, the hydraulic control reversing valve and the damping two respectively.

[0007] As a preferred scheme of the application, the compensation valve core is connected with an LS oil channel, the main valve core and the check valve.

[0008] As a preferred scheme of the application, the check valve is connected with the compensation valve core and the main valve core, and the damping two is connected with the oil return channel T.

[0009] As a preferred scheme of the application, the pressure limiting signal generator one, the pressure limiting signal generator two and the pressure limiting signal generator adopt but are not limited to plugs, overflow valves, electromagnetic valves, logic valves and sequence valves.

[0010] Compared with the prior art, the application has the following advantages:

[0011] 1. In the present application, a valve after compensation system with pressure limiting function is designed, the mechanical structure in the system is used to control the on-off of single connection oil inlet channel, small flow is used for pressure limiting, and excess flow can also work in other connections, so as to realize the function of increasing small flow pressure limiting, thus a more green and energy-saving working mode is realized, so it is more suitable for wide range of popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the hydraulic system principle structure of the present application.

[0013] In the figure: 1, damping one; 2, damping two; 3, hydraulic control reversing valve; 4, main valve core; 5, check valve; 6, compensation valve core; 7, pressure limiting signal generator one; 8, pressure limiting signal generator two; 9, damping three. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0015] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings, and several embodiments of the present application are given. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0016] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0018] Embodiment, please refer to Figure 1 The present application provides a technical solution:

[0019] A valve after compensation system with pressure limiting function, including damping one 1, damping two 2, liquid control reversing valve 3, main valve core 4, check valve 5, compensation valve core 6, pressure limiting signal generator one 7, pressure limiting signal generator two 8 and damping three 9, liquid control reversing valve 3 controls the oil inlet of main valve core 4, and the reversing of liquid control reversing valve 3 is controlled by pressure limiting signal generator, main valve core 4 is connected with liquid control reversing valve 3, compensation valve core 6, check valve 5, A / B working oil port and oil return channel T, and the oil inlet and return of A / B working port are controlled, compensation valve core 6 is connected with LS oil channel, main valve core 4 and check valve 5, check valve 5 is connected with compensation valve core 6 and main valve core 4, pressure limiting signal generator one 7 and pressure limiting signal generator two 8 are connected with damping three 9, damping one 1, liquid control reversing valve 3 and damping two 2 respectively, and damping two 2 is connected with oil return channel T.

[0020] As a preferred scheme of the application, the pressure limiting signal generator one 7, the pressure limiting signal generator two 8 and the pressure limiting signal generator adopt but are not limited to plugs, overflow valves, electromagnetic valves, logic valves and sequence valves.

[0021] Implementation case

[0022] On the basis of the principle and structure of the existing electro-hydraulic proportional valve, a mechanical structure including multiple components is added, the mechanical structure including: a liquid control reversing valve, two pressure limiting signal generators and multiple dampings, wherein the pressure limiting signal generators can use multiple modules with different structures, including but not limited to plugs, overflow valves, electromagnetic valves, logic valves and sequence valves, since a single oil port corresponds to a single pressure limiting signal generator, two different pressure limiting modules can be actually set in different ways, the pressure limiting signal generators can be controlled by multiple signals such as working port pressure signals, electrical signals and mechanical signals to give signal oil, the liquid control reversing valve is used to control the on-off of the oil inlet channel of the main valve core, the control oil of the liquid control reversing valve is controlled by the pressure limiting signal generator, and the damping functions as a flow limiting and stabilizing;

[0023] As Figure 1 , specifically, the patent working piece can be used in cooperation with standard first piece and tail piece, can be replaced by standard working piece, and can also be used in cooperation with standard working piece, the working piece is based on the principle of standard valve after compensation working piece, and a mechanical structure including multiple components is added, the liquid control reversing valve 3 in the working piece controls the oil inlet of the main valve core 4, and the reversing of the liquid control reversing valve 3 is controlled by the pressure limiting signal generator.

[0024] Main valve core 4 connects hydraulic control reversing valve 3, compensation valve core 6, one-way valve 5, A / B working oil port and oil return channel T, responsible for controlling the oil inlet and return of A / B working port, compensation valve core 6 connects LS oil channel, main valve core 4, one-way valve 5, responsible for the highest pressure transmission and excess pressure consumption; one-way valve 5 connects compensation valve core 6, main valve core 4, prevents working port pressure from being reversed, protects the pump, and dampens three 9, dampens one 1, respectively connects working port and pressure limiting signal generator one 7, pressure limiting signal generator two 8, damping effect, pressure limiting signal generator one 7, pressure limiting signal generator two 8 are replaceable modules, various modules are freely switched and used, the same module can be selected, the different modules can be selected, and the pressure limiting signal generator one 7, pressure limiting signal generator two 8 are connected with the damping three 9, damping one 1, connecting the hydraulic control reversing valve 3 and the damping two 2, providing signal oil for the hydraulic control reversing valve 3, and the damping two 2 is connected with the oil return channel T, and is unloaded.

[0025] Work flow: when used as a conventional valve after compensation principle, main valve core 4 reverses, P oil channel oil enters working port A / B through hydraulic control reversing valve 3, main valve core 4, compensation valve core 6, one-way valve 5, single action and composite action principle has no special difference with general valve after compensation principle;

[0026] When the pressure limiting function starts, i.e. the pressure limiting signal generator starts to work, the signal oil is pushed by the damping through the signal generator to drive the hydraulic control reversing valve 3 to reverse, and the P port channel is throttled; the P port enters the working oil, and the oil is reduced, only a small amount of oil is allowed to pass; the oil will return to the oil return channel T from the damping 2; the small amount of oil allowed to pass is to maintain the continuous reversing of the hydraulic control reversing valve 3, and after the pressure limiting signal generator does not provide signal oil, due to the lack of oil supplement, the oil in the control cavity of the hydraulic control reversing valve 3 will be unloaded from the damping two 2, so that the hydraulic control reversing valve 3 resets;

[0027] This technology is applied to the valve after compensation principle. (The valve after compensation system (Flow Sharing System) refers to that the pressure compensation valve is arranged between the main valve and the actuator, and when working, the pressure oil first passes through the throttle hole of the main valve, and then passes through the compensator, so that the inlet pressure of the main valve core is the system working pressure, i.e. the P port pressure PP, and the outlet pressure of the main valve core is the maximum load pressure, i.e. the Ls port pressure PLs.△P is controlled by a three-way flow valve, which can be understood as a fixed value, i.e.△P=PP-PLs. According to the flow formula:

[0028]

[0029] Wherein: ad is flow coefficient, generally take 0.6-0.7, Q is through flow, A is valve core opening area, ΔP is the pressure difference before and after the main valve core, ρ is medium density, we can realize the change of output flow Q by controlling the main valve core opening area A. The patent realizes the use of small flow pressure limiting under certain conditions, making the whole system more green and energy-saving through a mechanical structure.

[0030] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A valve post-compensation system with pressure limiting function, comprising damping one (1), damping two (2), hydraulic directional valve (3), main valve core (4), check valve (5), compensation valve core (6), pressure limiting signal generator one (7), pressure limiting signal generator two (8), and damping three (9), characterized in that: The hydraulic control directional valve (3) controls the oil inlet of the main valve core (4). The hydraulic control port of the hydraulic control directional valve (3) is connected to the pressure limiting signal generator one (7), the pressure limiting signal generator two (8), and the return oil channel T. The pressure limiting signal generator one (7) or the pressure limiting signal generator two (8) controls the switching of the hydraulic control directional valve (3). The main valve core (4) is connected to the hydraulic control directional valve (3), the compensation valve core (6), the check valve (5), the A / B working oil port, and the return oil channel T. It controls the oil inlet and return of the A / B working port. One end of the pressure limiting signal generator one (7) is connected to the damper one (1), and the other end is connected to the hydraulic control directional valve (3), the damper two (2), and the pressure limiting signal generator two (8). One end of the pressure limiting signal generator two (8) is connected to the damper three (9), and the other end is connected to the hydraulic control directional valve (3), the damper two (2), and the pressure limiting signal generator one (7).

2. The valve downstream compensation system with pressure limiting function according to claim 1, characterized in that: The compensation valve core (6) is connected to the LS oil passage, the main valve core (4), and the check valve (5).

3. The valve downstream compensation system with pressure limiting function according to claim 1, characterized in that: The one-way valve (5) is connected to the compensation valve core (6) and the main valve core (4), and the damping valve (2) is connected to the return oil channel T.

4. The valve downstream compensation system with pressure limiting function according to claim 1, characterized in that: The pressure limiting signal generator one (7) and pressure limiting signal generator two (8) are in the form of plugs, overflow valves, solenoid valves, logic valves and sequence valves.

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