Balance valve

Abstract

The utility model discloses a balance valve, which relates to the technical field of hydraulic transmission and comprises a valve body, one end in the valve body is connected with an adjusting part, the other end in the valve body is connected with a valve sleeve, a main valve core corresponding to the adjusting part is movably arranged in the valve sleeve, and the valve body is connected with the adjusting part, the valve sleeve and the main valve core to form a control oil cavity I; a second control oil cavity used for controlling the main valve element to move is arranged between the main valve element and the valve sleeve, a one-way valve element is movably connected into the main valve element, a spring seat is fixedly connected to the end, extending to the first control oil cavity, of the one-way valve element, an auxiliary spring is arranged on the side close to the adjusting piece, and an auxiliary spring arranged on the one-way valve element in a sleeving mode is arranged between the spring seat and the main valve element. The other side of the one-way valve element extends out of the main valve element and is movably attached to the end face of the main valve element to form an oil inlet and outlet cavity, and the oil inlet and outlet cavity communicates with the first control oil cavity through an oil cavity between the valve sleeve and the main valve element. The functions of reverse overflow and flow balance can be achieved, the high-pressure reset rate of the balance valve is achieved, and the dynamic performance is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic transmission technical field, especially point to a balance valve. BACKGROUND

[0002] As an important element in the hydraulic system, the performance of the balance valve directly determines the stability of the system.

[0003] In the prior art, a kind of overflow type hydraulic balance valve with damping function is disclosed in Chinese patent with publication number CN 109611403 A and publication date April 12, 2019, including valve body, main valve core is slidably arranged in valve body, one-way valve core is slidably arranged at the center of main valve core, gap adjusting rod is installed on valve body, adjustable gap is arranged between gap adjusting rod and one-way valve core, control valve core is slidably arranged at the end of valve body away from oil inlet cavity.The patent can make the displacement of control valve core under the action of oil pressure in control oil cavity greater than the displacement of main valve core under the action of oil pressure in oil inlet cavity by adjusting the pre-tightening force of the two springs respectively under certain working conditions, so that the opening amount of improved balance valve is less than that of balance valve before improvement, and the "nodding" phenomenon is alleviated.Before the gap between gap adjusting rod and one-way valve core is zero, one-way valve core does not move relative to main valve core, and balance valve port will not be opened, so that the system is not disturbed by random transient interference to make load lose static state, and the occurrence of system vibration phenomenon is reduced.However, the balance valve still has the problems of poor reset rate and unadjustable spring reset rate. CONTENT OF UTILITY MODEL

[0004] In view of the deficiencies in the above background art, the utility model provides a kind of balance valve, solve the problem of poor reset rate of balance valve in prior art, cannot be adjusted.

[0005] The technical scheme of the utility model is realized as follows: a kind of balance valve, including valve body, one end of valve body is connected with adjusting piece, the other end in valve body is connected with valve sleeve, main valve core corresponding with adjusting piece is arranged in dynamic seal of valve sleeve, control oil cavity one is formed by the connection of valve body, adjusting piece, valve sleeve and main valve core, control oil cavity two for controlling the sliding of main valve core is arranged between main valve core and valve sleeve, one-way valve core is movably connected in main valve core, one-way valve core extends into control oil cavity one and is fixedly connected with spring seat, vice spring is arranged between spring seat and main valve core and sleeved on one-way valve core, one-way valve core extends out of the end surface of main valve core and is movably attached to form oil inlet and outlet cavity, oil cavity between valve sleeve and main valve core is communicated with control oil cavity one.

[0006] Further, the adjusting piece includes an adjusting rod, which is connected in dynamic seal to the valve body, a support block is movably connected to the adjusting rod to slide along the valve body, and a main spring is sleeved on the adjusting rod between the support block and the main valve core.

[0007] Further, the inner wall of the valve sleeve is provided with a plurality of limit grooves which are uniformly distributed in the circumferential direction.

[0008] Further, the adjusting rod is provided with a limiting ring matched with the valve body and a threaded part matched with the supporting block in a threaded mode.

[0009] Further, the supporting block is a square supporting block, four corners of the square supporting block correspond to the limit grooves, and the square supporting block is internally provided with a threaded hole matched with the threaded part in a threaded mode.

[0010] Further, the valve body is provided with a first oil inlet, the outer wall of the valve sleeve is provided with a groove one corresponding to the first oil inlet, the groove one is provided with a second oil inlet at the groove bottom, and the second oil inlet is communicated with a control oil cavity two.

[0011] Further, the valve sleeve and the valve body are provided with a sealing ring one, two sealing ring ones are located at two sides of the groove one, the valve sleeve and the main valve core are provided with a sealing ring two, a sealing ring three and a sealing ring four, the sealing ring two and the sealing ring four are located at two sides of the control oil cavity two, and the sealing ring three and the sealing ring four are located at two sides of the oil cavity.

[0012] Further, the valve sleeve is circumferentially provided with at least two oil inlet and outlet holes one, and the oil inlet and outlet holes one are communicated with the oil cavity.

[0013] Further, the main valve core is provided with a third oil inlet communicated with the control oil cavity one and an oil inlet and outlet hole two communicated with the oil cavity.

[0014] Further, the one-way valve core is a T-shaped rod, the maximum diameter d of the T-shaped rod is smaller than the inner diameter D of the valve sleeve, and the T-shaped rod is provided with a conical surface.

[0015] The utility model discloses the beneficial effects are: the utility model discloses in adjusting piece and control oil cavity one for control main valve core's removal, low friction resistance dynamic sealing structure between main valve core and valve sleeve, vice spring and spring seat cooperation for control one-way valve core's removal, and then realize control oil cavity whether can form the intercommunication tubular structure, realized balance valve high pressure reset rate, dynamic performance steady. Main valve core, one-way valve core valve port area gradient change design, can realize balance valve high-precision high stability, through the matching grinding technology processing, reduce valve seat leakage amount, high durability spring can guarantee the high life of balance valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0017] Figure 1 The structural schematic view of the present application is shown in the figure.

[0018] Figure 2 The hydraulic force acting relationship diagram of the main valve core of the present application is shown in the figure.

[0019] Figure 3 The application working condition schematic view of the present application is shown in the figure.

[0020] In the figure: 1, adjusting rod, 1-1, limiting ring, 1-2, threaded part, 2, supporting block, 2-1, threaded hole, 3, main spring, 4, valve body, 4-1, limiting groove, 4-2, first oil inlet, 5, valve sleeve, 5-1, second oil inlet, 5-2, groove one, 5-3, sealing ring three, 5-4, sealing ring four, 5-5, oil inlet and outlet hole one, 5-6, sealing ring one, 6, main valve core, 6-1, sealing ring two, 6-2, oil inlet and outlet hole two, 6-3, third oil inlet, 7, one-way valve core, 8, auxiliary spring, 9, spring seat. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in 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 the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0022] As Figure 1As shown in the embodiment 1, a balance valve includes a valve body 4, an adjusting member connected to one end of the valve body 4, a valve sleeve 5 connected to the other end of the valve body 4, a main valve core 6 movably arranged in the valve sleeve 5 and corresponding to the adjusting member, the adjusting member being capable of adjusting the reset of the main valve core 6, the valve body 4, the adjusting member, the valve sleeve 5 and the main valve core 6 being connected to form a control oil cavity I, a control oil cavity II being arranged between the main valve core 6 and the valve sleeve 5 and being used for controlling the movement of the main valve core 6, the control oil cavity II being communicated with the control oil cavity I through an oil cavity between the valve sleeve 5 and the main valve core 6, and the control oil cavity II being capable of pushing the main valve core 6 to move by oil to achieve the control effect, the main valve core 6 movably connecting a one-way valve core 7, the one-way valve core 7 extending to one end of the control oil cavity I and being fixedly connected with a spring seat 9, the spring seat 9 and the main valve core 6 being provided with a secondary spring 8 arranged on the one-way valve core 7, the secondary spring 8 being used for resetting the one-way valve core 7, the other side of the one-way valve core 7 extending out of the main valve core 6 and movably abutting against the end surface of the main valve core 6 to form an inlet and outlet oil cavity, the inlet and outlet oil cavity being communicated with the control oil cavity I through the oil cavity between the valve sleeve 5 and the main valve core 6, wherein the outlet of the inlet and outlet oil cavity is A port, the inlet of the oil cavity is B port, and the inlet of the control oil cavity I is C port, when the one-way valve core 7 abuts against the main valve core 6, the A port and the B port are in a communication state, and when the one-way valve core 7 abuts against the main valve core 6, the A port and the B port are in a closed state, the adjusting member and the control oil cavity I being used for controlling the movement of the main valve core 6, the secondary spring 8 and the spring seat 9 being used for controlling the movement of the one-way valve core 7, thereby realizing whether the inlet and outlet oil cavity can form a communication tubular structure, realizing the reverse overflow and flow balance effect, and realizing the high pressure reset rate and stable dynamic performance of the balance valve.

[0023] In the embodiment, the adjusting member includes an adjusting rod 1 movably connected to the valve body 4, the adjusting rod 1 movably connecting a support block 2 sliding along the valve body 4, the adjusting rod 1 being provided with a main spring 3 arranged between the support block 2 and the main valve core 6, the main spring 3 being a high durability spring and capable of ensuring the long service life of the balance valve, the inner wall of the valve sleeve 5 being provided with a plurality of limiting grooves 4-1 uniformly distributed in the circumferential direction, the adjusting rod 1 being provided with a limiting ring 1-1 matched with the valve body 4 and a threaded portion 1-2 threadedly matched with the support block 2, the support block 2 being a square support block 2, four corners of the square support block 2 corresponding to the limiting grooves 4-1, and the square support block 2 being provided with a threaded hole 2-1 threadedly matched with the threaded portion 1-2, and rotating the adjusting rod 1 can move the square support block 2 along the limiting grooves 4-1 to adjust the position of the square support block 2, thereby adjusting the spring force of the main spring 3, and the adjusting rod 1 and the square support block 2 are threadedly matched and self-locked through the threads.

[0024] As Figure 1As shown in the embodiment 2, the valve body 4 is provided with a first oil inlet 4-2, the outer wall of the valve sleeve 5 is provided with a groove I 5-2 corresponding to the first oil inlet 4-2, the groove bottom of the groove I 5-2 is provided with a second oil inlet 5-1, the groove I 5-2 is an annular groove, the first oil inlet 4-2 and the second oil inlet 5-1 are arranged in a staggered manner, and the second oil inlet 5-1 is in communication with the control oil chamber II. The first oil inlet 4-2 and the second oil inlet 5-1 form an oil inlet C of the control oil chamber II. When oil is supplied to the C port, the oil acts on the area A3 of the main valve core 6. When oil is supplied to the C port, the oil enters the control oil chamber II formed by the valve sleeve and the main valve core from the first oil inlet 4-2, the groove I 5-2 and the second oil inlet 5-1 under the groove I 5-2.

[0025] In this embodiment, the valve sleeve 5 and the valve body 4 are provided with a sealing ring I 5-6, and the two sealing ring I 5-6 are located on both sides of the groove I 5-2. The sealing ring I 5-6 is connected between the valve body 4 and the valve sleeve 5 to seal. The valve sleeve 5 and the main valve core 6 are provided with a sealing ring II 6-1, a sealing ring III 5-3 and a sealing ring IV 5-4. The sealing ring II 6-1 and the sealing ring IV 5-4 are located on both sides of the control oil chamber II, and the sealing ring III 5-3 and the sealing ring IV 5-4 are located on both sides of the oil chamber. The sealing ring I 5-6 and the sealing ring II 6-1 are both multiple sealing structures.

[0026] In this embodiment, the valve sleeve 5 is circumferentially provided with at least two oil inlet and outlet holes I 5-5, preferably four oil inlet and outlet holes I 5-5, which are circumferentially distributed at an angle of ninety degrees on the valve sleeve. The oil inlet and outlet hole I 5-5 is in communication with the oil chamber, and the oil inlet and outlet hole I 5-5 is in communication with the oil chamber to form an oil inlet B. The main valve core 6 is provided with a third oil inlet 6-3 in communication with the control oil chamber I and an oil inlet and outlet hole II 6-2 in communication with the oil chamber. The oil chamber is connected with the control oil chamber I, and oil is supplied from the B port. The oil enters the control oil chamber I through the oil chamber and the third oil inlet 6-3, and the oil acts on the main valve core 6 at this time. The area A2. When oil is supplied to the B port, the oil enters the oil chamber from the oil inlet and outlet hole I 5-5, and enters the control oil chamber I and the oil chamber through the third oil inlet 6-3 and the oil inlet and outlet hole II 6-2 in communication with the oil chamber, respectively.

[0027] In the embodiment, the one-way valve core 7 is a T-shaped rod, the maximum diameter d of the T-shaped rod is smaller than the inner diameter D of the valve sleeve 5, the distance between the maximum diameter d of the T-shaped rod and the inner diameter D of the valve sleeve 5 is 0.004-0.008 mm, and preferably the distance between D and d is 0.005 mm. A tapered surface is arranged on the T-shaped rod, and the inclination of the tapered surface on the T-shaped rod is smaller than the inclination of the end surface of the main valve core 6. When the one-way valve core 7 is tightly attached to the main valve core 6 under the action of the auxiliary spring 8, the outermost end surface of the one-way valve core 7 is located on the same plane as the end surface of the valve sleeve 5, at this time, the oil is passed from the rightmost A port, the area on which the oil acts on the T-shaped rod is A4, and the area on which the oil acts on the main valve core 6 is A1. When the oil is passed through the A port, the oil acts on the outer side of the sealing band of the main valve core from the gap between the main valve core and the one-way valve core.

[0028] The other structures are the same as those in Embodiment 1.

[0029] Specific working principle: When the oil is passed from the B port of the oil cavity, the oil is flowed out from the liquid outlet A port of the inlet and outlet oil cavity after reaching the opening pressure, thereby realizing the function of reverse overflow of the balance valve. After the oil is passed through the liquid inlet B port of the oil cavity, the oil enters the inlet and outlet oil cavity through the oil cavity, the pressure of the inlet and outlet oil cavity acts on the one-way valve core 7, and as the pressure in the oil cavity gradually increases, the one-way valve core 7 compresses the auxiliary spring 8 to move to the right, at this time the valve is opened, the oil is flowed out from the A port of the inlet and outlet oil cavity, thereby realizing the function of reverse overflow.

[0030] When the oil is passed from the A port and the C port, the oil is flowed out from the B port after reaching the opening pressure, if the pressure of the A port continuously increases, under the working condition of the heavy load, at this time the pressure of the C port decreases, the pressures of the A port and the C port reach a reverse restriction effect, at this time the flow of the B port keeps balance. The pressure of the A port acts on the valve seat end surface of the main valve core 6, and the pressure of the C port acts on the end surface of the main valve core 6, after reaching the opening pressure, the oil enters the inner cavity of the balance valve, and the pressure acts on the left end surface of the main valve core 6, in addition, the main spring 3 also receives the spring force and the liquid dynamic force, at this time the hydraulic pressure, the spring force and the liquid dynamic force reach a new balance relationship:

[0031]

[0032] wherein x is the function of the flow q. f The pre-compression amount of the main spring 3 is F y The liquid dynamic force is F.

[0033] According to the momentum theorem, x is the function of the flow q:

[0034]

[0035] wherein k is the stiffness coefficient of the main spring 3, and Cq is the flow coefficient, The flow area at the valve port. Different pressure P1 and P3 corresponds to different valve core stroke, different valve core stroke corresponds to different valve port opening, opening determines the size of the flow. When the valve is fully open, continue to increase the pressure P1 of A port, the valve port opening decreases, the flow area at the valve port decreases, at this time x decreases, according to the above formula, the flow q is basically unchanged, reaches the function of flow balance.

[0036] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A balancing valve, characterized in that, The valve body (4) is connected to an adjusting component at one end and to a valve sleeve (5) at the other end. A main valve core (6) corresponding to the adjusting component is dynamically sealed inside the valve sleeve (5). The valve body (4), adjusting component, valve sleeve (5) and main valve core (6) are connected to form a control oil chamber one. A control oil chamber two for controlling the sliding of the main valve core (6) is provided between the main valve core (6) and the valve sleeve (5). A one-way valve core (7) is movably connected inside the main valve core (6). The one-way valve core (7) extends into the control oil chamber one and is fixedly connected to a spring seat (9). A secondary spring (8) sleeved on the one-way valve core (7) is provided between the spring seat (9) and the main valve core (6). The one-way valve core (7) extends out of the main valve core (6) and movably contacts the end face of the main valve core (6) to form an inlet and outlet oil chamber. The inlet and outlet oil chamber is connected to the control oil chamber one through the oil chamber between the valve sleeve (5) and the main valve core (6).

2. The balancing valve according to claim 1, characterized in that, The adjusting component includes an adjusting rod (1), which is dynamically sealed to the valve body (4). A support block (2) that slides along the valve body (4) is movably connected to the adjusting rod (1), and a main spring (3) located between the support block (2) and the main valve core (6) is sleeved on the adjusting rod (1).

3. The balancing valve according to claim 2, characterized in that, The valve sleeve (5) has several circumferentially evenly distributed limiting grooves (4-1) on its inner wall.

4. The balancing valve according to claim 3, characterized in that, The adjusting rod (1) is provided with a limiting ring (1-1) that cooperates with the valve body (4) and a threaded part (1-2) that is threaded with the support block (2).

5. The balancing valve according to claim 4, characterized in that, The support block (2) is a square support block (2). The four corners of the square support block (2) correspond to the limiting groove (4-1). The square support block (2) is provided with a threaded hole (2-1) that is threaded to the threaded part (1-2).

6. The balancing valve according to any one of claims 2 to 5, characterized in that, The valve body (4) is provided with a first oil inlet (4-2), and the outer wall of the valve sleeve (5) is provided with a groove (5-2) corresponding to the first oil inlet (4-2). The bottom of the groove (5-2) is provided with a second oil inlet (5-1), and the second oil inlet (5-1) is connected to the control oil chamber.

7. The balancing valve according to claim 6, characterized in that, A sealing ring 1 (5-6) is provided between the valve sleeve (5) and the valve body (4). The two sealing rings 1 (5-6) are located on both sides of the groove 1 (5-2). A sealing ring 2 (6-1), a sealing ring 3 (5-3) and a sealing ring 4 (5-4) are provided between the valve sleeve (5) and the main valve core (6). The sealing ring 2 (6-1) and the sealing ring 4 (5-4) are located on both sides of the control oil chamber 2. The sealing ring 3 (5-3) and the sealing ring 4 (5-4) are located on both sides of the oil chamber.

8. The balancing valve according to claim 7, characterized in that, The valve sleeve (5) is provided with at least two oil inlet and outlet holes (5-5) in the circumferential direction, and the oil inlet and outlet holes (5-5) are connected to the oil cavity.

9. The balancing valve according to claim 8, characterized in that, The main valve core (6) is provided with a third oil inlet (6-3) that communicates with the first control oil chamber and an oil inlet / outlet hole (6-2) that communicates with the second inlet / outlet oil chamber.

10. The balancing valve according to any one of claims 7 to 9, characterized in that, The one-way valve core (7) is a T-shaped rod. The maximum diameter d of the T-shaped rod is smaller than the inner diameter D of the valve sleeve (5). The T-shaped rod has a tapered surface.

Images