Hydraulic balance valve with adjustable flow and pressure compensation

Abstract

The utility model discloses a flow-adjustable hydraulic balance valve with a pressure compensation function. The flow-adjustable hydraulic balance valve comprises a valve body, a main valve element, a pressure adjusting spring, a pressure compensator, a flow adjuster and the like. One end of the pressure compensator is installed on the spring cavity assembly, the other end of the pressure compensator is inserted into the flow adjusting exhaust cylinder, and the opening pressure of the main valve element is ensured to be stable by counteracting the influence of oil return back pressure on the pressure adjusting spring. The flow regulator dynamically adjusts the rated flow of the balance valve by adjusting the initial distance between the exhaust cylinder end cover and the pressure compensator. The problems that the flow of a traditional balance valve cannot be adjusted and backpressure interference occurs are solved, and the stability and applicability of a hydraulic system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, in particular to a hydraulic balance valve with adjustable flow and pressure compensation. BACKGROUND

[0002] The rated flow of the conventional hydraulic balance valve is fixed and cannot be dynamically adjusted according to system requirements, resulting in insufficient system stability. In addition, the back pressure of the oil return will act on the pressure regulating spring through the spring cavity pressure relief oil way, interfering with the opening pressure of the main valve core and causing control deviation. Some industries use a balance valve and rely on fixed damping holes to adjust the flow, but cannot adapt to load changes. Some also use a double spring structure to offset the back pressure, but the structure is complex and the adjustment range is limited. That is, the prior art has the following problems:

[0003] 1) Flow cannot be adjusted - the flow of the balance valve is fixed and cannot match different working condition requirements;

[0004] 2) Back pressure interference - the back pressure of the oil return affects the set value of the pressure regulating spring, resulting in unstable opening pressure of the main valve core;

[0005] 3) Complex structure - existing compensation schemes require additional valve cores or oil ways, increasing the risk of failure and other defects.

[0006] Therefore, it is urgent to solve the problems of poor system stability and limited applicability caused by the flow of the conventional hydraulic balance valve being unadjustable and the back pressure of the oil return interfering. SUMMARY

[0007] The purpose of the present application is to provide a hydraulic balance valve with adjustable flow and pressure compensation, which can better solve the problems of unadjustable flow and back pressure interference of conventional balance valves, and significantly improve the stability and applicability of the hydraulic system.

[0008] The technical solution adopted by the present application is: a hydraulic balance valve with adjustable flow and pressure compensation for connecting an oil inlet and an oil outlet, wherein a one-way valve is arranged between the oil inlet and the oil outlet, the hydraulic balance valve comprises a valve body, a main valve core and a pressure regulating spring are arranged inside the valve body, and the hydraulic balance valve further comprises:

[0009] a spring cavity assembly connected with the pressure regulating spring and communicating with the oil inlet through a spring cavity pressure relief oil way;

[0010] a pressure compensator, one end of which is fixed to the spring cavity assembly and the other end of which is inserted into a flow regulating exhaust cylinder, the flow regulating exhaust cylinder is provided with a gas hole communicating with the atmosphere and has an exhaust cylinder end cover fixed inside, and the flow regulating exhaust cylinder is used to offset the force of the back pressure of the oil return on the pressure regulating spring;

[0011] a flow regulator movably connected with the exhaust cylinder end cover through threads.

[0012] and,

[0013] The pressure compensator has an initial spacing with the flow regulating exhaust cylinder to control the rated flow of the hydraulic balance valve.

[0014] The pressure compensator is coaxially arranged with the pressure regulating spring, both of which adjust the pre-tightening force through a pressure regulator, and a compensator seal is arranged between the pressure compensator and the spring cavity assembly.

[0015] The main valve core has a load cavity and a pilot cavity, and the opening of the main valve core is jointly acted by the hydraulic pressures of the load cavity and the pilot cavity, the load cavity is communicated with the oil outlet through a load acting oil channel, and the pilot cavity receives external pressure oil through a pilot oil channel.

[0016] The pre-tightening force of the pressure regulating spring is set through a pressure regulator, and the displacement amount of the pressure compensator real-time offsets the interference of the back pressure of the return oil on the pre-tightening force of the pressure regulating spring.

[0017] Compared with the prior art, the present application has the advantages that the problems of unadjustable flow and back pressure interference of the traditional balance valve can be better solved, and the stability and applicability of the hydraulic system can be significantly improved. The flow regulator of the flow adjustable and pressure compensating hydraulic balance valve of the present application realizes stepless adjustment of the rated flow through a mechanical structure, which can adapt to different system requirements. At the same time, the influence of back pressure on the pressure regulating spring is offset by using a pressure compensator, so as to ensure that the opening pressure of the main valve core is accurately controllable. In addition, the overall structure is compact and has high reliability, and can be applied to high back pressure complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and examples:

[0019] Figure 1 is the connection diagram of the flow adjustable and pressure compensating hydraulic balance valve of the embodiment of the present application.

[0020] In the drawings:

[0021] 1, oil inlet, 2, oil inlet channel, 3, pressure maintaining oil channel, 4, oil outlet, 5, load acting oil channel, 6, pilot oil channel, 7, spring cavity pressure relief oil channel, 8, load cavity, 9, pilot cavity, 10, spring cavity assembly, 11, flow regulating exhaust cylinder, 12, pressure regulator, 13, compensator seal, 14, pressure compensator, 15, pressure regulating spring, 16, exhaust cylinder end cover, 17, flow regulator, 18, valve body, 19, main valve core, 20, check valve. DETAILED DESCRIPTION

[0022] Embodiment, see Figure 1As shown: adjustable flow hydraulic balance valve with pressure compensation, for connecting the oil inlet 1 and oil outlet 4. The oil inlet 1 and oil outlet 4 is provided with a one-way valve 20. That is, the oil inlet 2 of the one-way valve 20 is connected to the oil inlet 1, and the pressure holding oil way 3 is connected to the oil outlet 4.

[0023] Specifically:

[0024] The adjustable flow hydraulic balance valve with pressure compensation includes a valve body 18. The valve body 18 is internally provided with a main valve core 19 and a pressure regulating spring 15. That is, the pressure regulating spring 15 sets the opening pressure of the valve through the pre-tightening force, and when the system pressure exceeds the spring set value, the valve opens to release the pressure, and when the pressure falls, the spring resets to keep the system pressure within a safe range.

[0025] Further:

[0026] The adjustable flow hydraulic balance valve with pressure compensation also includes a spring cavity assembly 10, a pressure compensator 14, a flow regulator 17 and other components.

[0027] Among them,

[0028] The spring cavity assembly 10 is connected with the pressure regulating spring 15. That is, the inner hole of the pressure regulating spring 15 is connected in series on the outer circle of the pressure compensator 14, one end of the pressure regulating spring 15 is blocked by the step of the pressure compensator 14, and the other end is pressed by a pressure regulator 12, the outer circle of the pressure regulator 12 is connected with the spring cavity assembly 10 by screw thread, the pressure compensator 14 is pressed on the main valve core 19 by the elastic force of the pressure regulating spring 15, forming a pre-tightening force, and communicating with the oil inlet 1 through a spring cavity pressure relief oil way 7.

[0029] One end of the pressure compensator 14 is fixed in the spring cavity assembly 10, and the other end is inserted into a flow regulating exhaust cylinder 11. The flow regulating exhaust cylinder 11 is provided with a gas hole communicating with the atmosphere and internally fixed with an exhaust cylinder end cover 16, and the flow regulating exhaust cylinder 11 is used to offset the force of the back pressure of the oil return to the pressure regulating spring 15.

[0030] The flow regulator 17 is movably connected with the exhaust cylinder end cover 16 by screw thread. That is, the flow regulator 17 adjusts the screw thread of the exhaust cylinder end cover 16 by rotating, changes the initial position of the flow regulator 17 in the regulating exhaust cylinder 11, and further adjusts the opening stroke of the main valve core 19.

[0031] Further:

[0032] The pressure compensator 14 and the flow regulating exhaust cylinder 11 have an initial spacing to control the rated flow of the hydraulic balance valve.

[0033] Optimized:

[0034] The pressure compensator 14 is coaxially arranged with the pressure regulating spring 15, and the two are adjusted by a pressure regulator 12 to pre-tighten, and a compensator seal 13 is arranged between the pressure compensator 14 and the spring cavity assembly 10.

[0035] Further optimization:

[0036] The main valve core 19 has a load cavity 8 and a pilot cavity 9, and the opening of the main valve core 19 is jointly acted by the hydraulic pressure of the load cavity 8 and the pilot cavity 9. The load cavity 8 is communicated with the oil outlet 4 through a load acting oil way 5, and the pilot cavity 9 receives external pressure oil through a pilot oil way 6.

[0037] The pre-tightening force of the pressure regulating spring 15 is set by the pressure regulator 12, and the displacement amount of the pressure compensator 14 is used to compensate the interference of the back pressure of the return oil on the pre-tightening force of the pressure regulating spring 15 in real time.

[0038] Among the above components:

[0039] The pressure compensator 14 compensates the effect of the back pressure of the return oil on the pressure regulating spring 15, and ensures that the opening pressure of the main valve core 19 is stable.

[0040] The flow regulator 17 adjusts the distance between the pressure compensator 14 and the exhaust cylinder end cover 16 through threads, dynamically changes the opening stroke of the main valve core 19, and realizes adjustable flow.

[0041] The spring cavity assembly 10 integrates the pressure regulating spring 15 and the compensator seal 13, and prevents oil leakage.

[0042] Working principle of the present application:

[0043] 1) Hydraulic oil enters the oil outlet 4 from the oil inlet 1 through the one-way valve 20, acts on the load cavity 8 through the load acting oil way 5, and pushes the main valve core 19 to overcome the pre-tightening force of the pressure regulating spring 15. When external pressure oil enters the pilot cavity 9 through the pilot oil way 6, the main valve core 19 is further opened, the oil outlet 4 and the oil inlet 1 are connected, and the hydraulic cylinder retraction speed is controlled.

[0044] When back pressure compensation is realized: if there is back pressure of return oil at the oil inlet 1, the back pressure acts on the pressure compensator 14 through the spring cavity pressure relief oil way 7, and the reaction force compensates the interference of the back pressure on the pressure regulating spring 15, so that the opening pressure of the main valve core 19 is consistent with the set value.

[0045] When flow regulation is realized, rotate the flow regulator 17 to drive the exhaust cylinder end cover 16 to move along the threads, change the initial distance between the pressure compensator 14 and the flow regulating exhaust cylinder 11, and when the distance increases, the opening stroke of the main valve core 19 increases, and the rated flow increases; otherwise, the flow decreases.

[0046] In order to achieve better effect, the following parameter optimization can be done through experiment verification:

[0047] The pre-tightening force range of the pressure regulating spring 15 is 5-20 MPa, which can be set by the pressure regulator 12.

[0048] The flow regulator 17 has a thread lead of 1 mm / turn, and the flow is adjusted by 10 L / min per turn.

[0049] The compensator seal 13 adopts fluorine rubber material, and the pressure resistance is 35 MPa.

[0050] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A flow-adjustable hydraulic balance valve with pressure compensation, used to connect an inlet (1) and an outlet (4), wherein a check valve (20) is provided between the inlet (1) and the outlet (4), the hydraulic balance valve comprising a valve body (18), wherein a main valve core (19) and a pressure regulating spring (15) are provided inside the valve body (18), characterized in that: The hydraulic balance valve further comprises: a spring cavity assembly (10) connected with the pressure regulating spring (15) and communicating with the oil inlet (1) through a spring cavity pressure relief oil passage (7); a pressure compensator (14) fixed at one end of the spring cavity assembly (10) and inserted into a flow regulating exhaust cylinder (11) at the other end, the flow regulating exhaust cylinder (11) being provided with air holes communicating with the atmosphere and having an exhaust cylinder end cover (16) fixed inside, and the flow regulating exhaust cylinder (11) being used to offset the force of the pressure regulating spring (15) caused by the back pressure of the oil return; a flow regulator (17) movably connected with the exhaust cylinder end cover (16) through screw threads; and the pressure compensator (14) and the flow regulating exhaust cylinder (11) have an initial spacing to control the rated flow of the hydraulic balance valve.

2. The flow adjustable, pressure compensated, hydraulic balance valve of claim 1, wherein: The pressure compensator (14) is coaxially arranged with the pressure regulating spring (15), and the pre-tightening force of the two is adjusted by a pressure regulator (12), and a compensator seal (13) is arranged between the pressure compensator (14) and the spring cavity assembly (10).

3. The flow adjustable, pressure compensated, hydraulic balance valve of claim 1, wherein: The main valve core (19) has a load cavity (8) and a pilot cavity (9), and the opening of the main valve core (19) is jointly acted by the hydraulic pressure of the load cavity (8) and the pilot cavity (9), the load cavity (8) communicates with the oil outlet (4) through a load acting oil passage (5), and the pilot cavity (9) receives external pressure oil through a pilot oil passage (6).

4. The flow adjustable, pressure compensated, hydraulic balance valve of claim 1, wherein: The pre-tightening force of the pressure regulating spring (15) is set by a pressure regulator (12), and the displacement of the pressure compensator (14) offsets the interference of the pre-tightening force of the pressure regulating spring (15) caused by the back pressure of the oil return in real time.

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