Pilot adjustable balance valve

Abstract

A pilot adjustable balance valve relates to the technical field of hydraulic control. Comprising a valve body, a balance valve assembly, a damping one-way valve and a pilot adjusting screw. The pilot adjusting screw is fixedly arranged in the pilot oil hole in a rotatable adjusting mode, the remaining space of the pilot oil hole is changed by controlling the screwing-in depth of the pilot adjusting screw, and therefore force acting on the damping one-way valve is controlled. Pilot oil acts on the damping one-way valve through the pilot oil hole to drive the balance valve element to move, and the second load opening and the first oil inlet or the second oil inlet are communicated. When the pilot adjusting screw is screwed down, the gap between the pilot adjusting screw and the pilot oil hole is reduced, the pressure acting on the damping one-way valve is gradually reduced, and the pilot ratio is gradually reduced. According to the scheme, the flow circulation area of the pilot oil hole is changed, the pressure acting on the damping one-way valve is reduced, and therefore the pilot ratio is reduced, and a system operates more stably.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, in particular to a pilot control balancing valve. Background Art

[0002] At present, the pilot ratio of most balancing valves is fixed. Commonly used pilot ratios include 3:1, 4.5:1, and 8:1. When the pilot ratio is relatively large, the opening sensitivity of the balancing valve is high, and a relatively small control pressure can open the valve port. However, slight fluctuations in the control pressure will cause the balancing valve port to repeatedly open and close at a high frequency. The end effector is prone to jitter and has poor stability, affecting the safety of the main engine. When the pilot ratio is relatively small, a higher control pressure is required to open the valve port, and the system energy consumption is relatively high. In actual working conditions, the main engine needs to select an appropriate pilot ratio to balance system stability and energy consumption. However, in actual working conditions, changes require shutting down the machine to disassemble and replace accessories, which is relatively cumbersome. Therefore, how to quickly and conveniently change the pilot ratio has become a technical problem that needs to be solved in this field. Summary of the Invention

[0003] In response to the above technical problems, the present invention provides a balancing valve with an adjustable pilot and a working method, which can realize convenient and rapid adjustment of the pilot by adjusting the screw to improve the stability of system operation.

[0004] The technical solution of the present invention is:

[0005] Pilot-operated adjustable balancing valve, including:

[0006] The valve body has a main hole extending horizontally inward at one end and a pilot oil hole connected to the main hole at the other end; a load port 1, a load port 2, an oil inlet 1, an oil inlet 2 and an oil inlet 3 connected to the main hole are provided on the side of the valve body;

[0007] a balancing valve assembly, inserted into the main hole;

[0008] A one-way valve with damping, sleeved on the balancing valve assembly;

[0009] The pilot adjusting screw is rotatably adjusted and fixedly arranged in the pilot oil hole. By controlling the depth of the pilot adjusting screw being screwed in, the remaining space of the pilot oil hole is changed, thereby controlling the force acting on the damped one-way valve.

[0010] Specifically, the pilot adjusting screw is provided with a pilot adjusting nut adapted thereto, and the pilot adjusting screw is secured to the end of the valve body by locking the pilot adjusting nut.

[0011] Specifically, the valve body is provided with a pressure measuring port connected to the main hole.

[0012] Specifically, the front end of the pilot adjusting screw is in a frustum shape, the major diameter of the frustum is larger than the aperture of the pilot oil hole, and the minor diameter of the frustum is smaller than the aperture of the pilot oil hole.

[0013] Specifically, the balancing valve assembly includes:

[0014] The balancing valve sleeve is detachably sealed and fixedly arranged in the main hole, and a working chamber is provided in the middle; an adjusting screw is provided at the outer end of the balancing valve sleeve and extends into the working chamber;

[0015] A balancing valve core, the tail end of which is sealed and slides in the balancing valve sleeve, and the front end of which is sealed and slides in the first cavity in the main hole and is connected to the damped one-way valve;

[0016] A balancing valve spring seat is provided in the balancing valve sleeve, one end of which is adapted to the adjusting screw, and the other end of which is connected to the tail end of the balancing valve core through the balancing valve spring;

[0017] A one-way valve seat is sealingly and slidably disposed in the main hole, and its inner cavity is adapted to the valve core of the balancing valve;

[0018] The one-way valve spring seat is sleeved on the spool of the balance valve and is pressed into the third cavity of the main hole by the one-way valve spring.

[0019] Specifically, the adjusting screw is rotatably fixed on the valve sleeve of the balancing valve through a thread.

[0020] Specifically, the adjusting screw is provided with a detachable and fixed balancing valve adjusting nut.

[0021] Specifically, one end of the one-way valve spring is located in the limiting hole at the end of the one-way valve seat, and the other end is connected to the one-way valve spring seat.

[0022] The utility model includes a valve body, a balancing valve assembly, a damped one-way valve and a pilot adjusting screw; the pilot adjusting screw can be rotatably adjusted and fixedly set in the pilot oil hole. By controlling the depth of the pilot adjusting screw, the remaining space in the pilot oil hole is changed, thereby controlling the force acting on the damped one-way valve. The pilot oil acts on the damped one-way valve through the pilot oil hole, driving the movement of the balancing valve core, connecting load port two and oil inlet one or two; tightening the pilot adjusting screw, the gap between the pilot adjusting screw and the pilot oil hole becomes smaller, the pressure acting on the damped one-way valve gradually decreases, and the pilot ratio gradually decreases. This case reduces the pressure acting on the damped one-way valve by changing the flow flow area of ​​the pilot oil hole, thereby reducing the pilot ratio and making the system run more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the internal structure of the pilot-controlled balancing valve;

[0024] Figure 2 is Figure 1 The structure schematic diagram of the area magnification in the circle is shown in the figure.

[0025] Figure 3 The structure schematic diagram of the pilot adjusting screw is shown in the figure.

[0026] Figure 4 The structure schematic diagram of the working state is shown in the figure.

[0027] Figure 5 The structure schematic diagram of the pilot control balance valve is shown in the figure.

[0028] Figure 1 is a valve body, 11 is a main hole, 12 is an oil inlet one, 13 is an oil inlet two, 14 is an oil inlet three, 15 is a load port one, 16 is a pilot oil hole, 17 is a pressure measuring port, 18 is a load port two.

[0029] 2 is a balance valve assembly, 21 is an adjusting screw, 22 is a balance valve adjusting nut, 23 is a balance valve spring seat, 24 is a balance valve spring, 25 is a balance valve spool, 26 is a one-way valve seat, 27 is a one-way valve spring, 28 is a one-way valve spring seat, and 29 is a balance valve sleeve.

[0030] 3 is a pilot adjusting nut, 4 is a pilot adjusting screw, and 5 is a one-way valve with damping. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] As Figure 1-5 shown; the pilot adjustable balance valve comprises:

[0034] The valve body 1 has a main hole 11 extending horizontally inward at one end and a pilot oil hole 16 communicating with the main hole 11 at the other end. A load port 15, a load port 2 18, an oil inlet 12, an oil inlet 2 13, and an oil inlet 3 14 communicating with the main hole 11 are provided on the side of the valve body 1.

[0035] The valve body 1 is provided with a pressure measuring port 17 which is in communication with the main hole 11 .

[0036] The balancing valve assembly 2 is inserted into the main hole 11;

[0037] A damping check valve 5 is sleeved on the balancing valve assembly 2;

[0038] The pilot adjustment screw 4 is rotatably fixed within the pilot oil hole 16. By controlling the depth of the pilot adjustment screw 4, the remaining space in the pilot oil hole 16 is changed, thereby controlling the force acting on the damped check valve. In other words, by changing the flow area of ​​the pilot oil hole, the pressure acting on the damped check valve 5 is reduced, thereby lowering the pilot ratio and achieving more stable system operation.

[0039] The pilot adjusting screw 4 is provided with a pilot adjusting nut 3 adapted thereto. By tightening the pilot adjusting nut 3 , the pilot adjusting screw 4 is secured to the end of the valve body 1 .

[0040] The front end of the pilot adjusting screw 4 is in a frustum shape, the large diameter of the frustum is larger than the diameter of the pilot oil hole 16, and the small diameter of the frustum is smaller than the diameter of the pilot oil hole 16. The front end is inserted into the pilot oil hole 16 through a thread.

[0041] The balancing valve assembly is a conventional component in this field, mainly including:

[0042] The balancing valve sleeve 29 is detachably sealed and fixedly disposed in the main hole 11, with a working chamber provided in the middle thereof; an adjusting screw 21 extending into the working chamber is provided at the outer end of the balancing valve sleeve 29;

[0043] The adjusting screw 21 is rotatably fixed on the balancing valve sleeve 29 via a thread.

[0044] A balancing valve adjusting nut 22 is provided on the adjusting screw 21 and is detachably fixed thereto.

[0045] The balancing valve core 25 has a rear end that slides in a sealed manner within the balancing valve sleeve 29 and a front end that slides in a sealed manner within the first cavity in the main hole 11 and is connected to the damped check valve 5; in this case, the first cavity is connected to the pilot oil hole 16;

[0046] The balancing valve spring seat 23 is disposed in the balancing valve sleeve 29, with one end adapted to the adjusting screw 21 and the other end connected to the tail end of the balancing valve core 25 via the balancing valve spring 24;

[0047] One-way valve seat 26, sealing slidingly disposed in the main hole 11, its inner cavity is matched with the balance valve spool 25;

[0048] One-way valve spring seat 28, sleeved on the balance valve spool 25, pressed in the third hole cavity of the main hole 11 by one-way valve spring 27 Figure 1 The right side of the one-way valve spring seat 28 is called the second cavity, connecting the first hole cavity and the third hole cavity. One end of the one-way valve spring 27 is located in the limiting hole at the end of the one-way valve seat 26, and the other end is connected with the one-way valve spring seat 28.

[0049] The front end of the pilot adjusting screw 4 in the case ( Figure 3 The left side end is a circular truncated cone, which can control the size of the gap between the pilot oil hole 16 and the pilot adjusting screw 4 by the depth of screwing, thereby controlling the force acting on the damping one-way valve. The smaller the gap, the smaller the force, and the smaller the pilot ratio.

[0050] The working method of the pilot adjustable balance valve, the load port two 18 is connected with the working oil cylinder, the oil inlet one or two is connected with the hydraulic control valve, and the load port is connected with the pilot control valve or the working oil cylinder return cavity;

[0051] The following steps are taken:

[0052] 1) The pilot oil acts on the damping one-way valve 5 through the pilot oil hole, drives the balance valve spool to move, and connects the load port two 18 and the oil inlet one 12 or the oil inlet two 13.

[0053] 2) Tighten the pilot adjusting screw 4, the gap between the pilot adjusting screw 4 and the pilot oil hole 16 becomes smaller, the pressure acting on the damping one-way valve 5 gradually becomes smaller, the pilot ratio gradually decreases, and the system runs more stably.

[0054] The present application is not limited to the above embodiments, on the basis of the technical solutions disclosed in the present application, those skilled in the art can make some substitutions and modifications to some technical features according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the present application.

Claims

1. Pilot adjustable balancing valve, characterized by: include: The valve body (1) has a main hole (11) extending horizontally inward at one end and a pilot oil hole (16) communicating with the main hole (11) at the other end; a load port 1 (15), a load port 2 (18), an oil inlet 1 (12), an oil inlet 2 (13) and an oil inlet 3 (14) communicating with the main hole (11) are provided on the side of the valve body (1); A balancing valve assembly (2) is inserted into the main hole (11); A one-way valve (5) with damping, sleeved on the balancing valve assembly (2); The pilot adjustment screw (4) is rotatably adjusted and fixedly arranged in the pilot oil hole (16). By controlling the depth of the pilot adjustment screw (4) being screwed in, the remaining space in the pilot oil hole (16) is changed, thereby controlling the force acting on the damping check valve.

2. The pilot adjustable balancing valve according to claim 1, characterized in that: The pilot adjustment screw (4) is provided with a pilot adjustment nut (3) adapted thereto, and the pilot adjustment screw (4) is secured to the end of the valve body (1) by tightening the pilot adjustment nut (3).

3. The pilot adjustable balancing valve according to claim 1, characterized in that: The valve body (1) is provided with a pressure measuring port (17) communicating with the main hole (11).

4. The pilot adjustable balancing valve according to claim 1, characterized in that: The front end of the pilot adjustment screw (4) is in a frustum shape, the large diameter of the frustum is larger than the diameter of the pilot oil hole (16), and the small diameter of the frustum is smaller than the diameter of the pilot oil hole (16).

5. The pilot adjustable balancing valve according to claim 1, characterized in that: The balancing valve assembly comprises: A balancing valve sleeve (29) is detachably sealed and fixedly arranged in the main hole (11), and a working chamber is provided in the middle thereof; an adjusting screw (21) is provided at the outer end portion of the balancing valve sleeve (29) and extends into the working chamber; A balancing valve core (25) having a tail end sealingly sliding in the balancing valve sleeve (29) and a front end sealingly slidingly arranged in the first cavity in the main hole (11) and connected to the damping check valve (5); A balancing valve spring seat (23) is arranged in the balancing valve sleeve (29), one end of which is adapted to the adjusting screw (21), and the other end of which is connected to the tail end of the balancing valve core (25) via the balancing valve spring (24); A one-way valve seat (26) is sealingly and slidably disposed in the main hole (11), and its inner cavity is adapted to fit the balancing valve core (25); A one-way valve spring seat (28) is sleeved on the balancing valve core (25) and is pressed into the third cavity of the main hole (11) by the one-way valve spring (27).

6. The pilot adjustable balancing valve according to claim 5, characterized in that: The adjusting screw (21) is rotatably fixed on the balancing valve sleeve (29) via a thread.

7. The pilot adjustable balancing valve according to claim 6, characterized in that: The adjusting screw (21) is provided with a balancing valve adjusting nut (22) which is detachably fixed.

8. The pilot adjustable balancing valve according to claim 5, characterized in that: One end of the one-way valve spring (27) is located in a limiting hole at the end of the one-way valve seat (26), and the other end is connected to the one-way valve spring seat (28).

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