An adjustable multi-outlet synchronous valve

Abstract

The present invention provides an adjustable multi-outlet synchronous valve. It is based on an adjustable synchronous valve with one inlet and two outlets as a basic unit, by setting at least one or two basic units, and adding an additional unit connected by a first spiral connecting rod to the valve core at the end of the basic unit; or setting an integral structure formed by connecting a second spiral connecting rod between any two adjacent basic units. It can significantly improve the synchronization accuracy, significantly increase the applicability, reduce the system back pressure, and increase the efficiency. It has changed the traditional concept, simplified the processing technology and processing difficulty, and can flexibly design the volume size according to the space required on site, effectively avoiding the problem of the installation space being limited by the quantity and volume. Compared with the existing similar functional elements, the invention is novel in conception, compact and reasonable in structure, low in cost and long in life, stable and reliable in performance, and has obvious advantages in various application indicators, and has substantial characteristics and significant progress.

Description

Technical Field

[0001] The invention relates to a hydraulic synchronous valve, in particular to a parallel hydraulic synchronous valve which can adapt to the change of inlet flow and has one inlet and multiple outlets. Background Art

[0002] According to market research and industry data, the structure of synchronization valves at home and abroad is a three-way structure with one inlet and two outlets. The synchronization valve of this structure can only be used to control two actuators. However, in the application field of hydraulic components, it is often encountered to control multiple (i.e. more than two) actuators, such as using synchronization valves to control the synchronization of multiple hydraulic cylinders or multiple hydraulic motors; for this, multiple synchronization valves are currently connected in series or in parallel. The series three-cylinder synchronization consists of a primary valve with a ratio of 2:1 and a secondary synchronization valve with a geometric ratio of 1:1; the four-cylinder synchronization consists of a geometric ratio primary valve and two geometric ratio secondary valves. The disadvantages of this series structure are:

[0003] 1. The accuracy requirement for a single synchronous valve is extremely high. Because it is a hierarchical series connection, the errors are superimposed. If the overall synchronization accuracy requirement of multiple actuators is 1%, the bidirectional synchronization accuracy requirement of a single valve flow distribution should be less than 0.5%, which is extremely difficult to achieve for an open-loop control synchronous valve.

[0004] 2. If the actuator is a cylinder, the back pressure is extremely large. Due to the inherent speed ratio of the cylinder itself, the flow rate on the rodless cavity side increases, which increases the hydraulic resistance of the synchronous valve itself. In addition, due to the combined influence of multi-stage series damping, the back pressure increases exponentially according to the number of series stages when the system is divided, and the back pressure under the flow collection condition reaches 2-4 times that of the flow. The cylinder often extends but cannot be retracted. This method results in low energy efficiency of the high-pressure system, and the medium and low-pressure systems consider power consumption requirements or adopt cost-increasing pressure reduction design or directly give up other methods.

[0005] 3. According to the hierarchical connection principle, it can only realize the synchronous control of 3 cylinders (divided into two stages), 4 cylinders (divided into two stages), and 8 cylinders (divided into three stages). When 5 or 6 cylinders need to be synchronized, it cannot be synchronized according to the hierarchy. Foreign products include one-inlet and three-outlet and four-outlet pressure-flow compound valves. The domestic market has seen products from Hawe Company, whose internal structure is still a combination of multiple synchronous valves in series, and this product can achieve synchronization of up to four actuators.

[0006] The parallel connection is used to achieve multi-way synchronization. This connection method uses the same number of valves as the series connection method, and it can only be achieved by using a proportional synchronization valve. Taking one inlet and four outlets as an example, the inlets of two synchronization valves are connected in parallel to form four outlets connected to the inlets of four oil cylinders. Outlets 1 and 4 of the four outlets of the valve are connected to the oil tank through the outlet of the oil cylinder, while outlets 2 and 3 of the four outlets of the valve are connected to the inlet of the third proportional synchronization valve located opposite through the outlet of the oil cylinder. In principle, this connection method attempts to control the synchronization of the entire four cylinders by indirectly controlling the synchronization of cylinders 2 and 3, and can reduce the back pressure to a certain extent. However, in actual applications, it is still affected by the accuracy of a single valve, and the oil cylinder on one side of the oil return port directly connected to the oil tank lags seriously when overloaded, but rushes forward when unloaded, and still loses synchronization control. Therefore, this connection method is rarely seen or not used at all in applications.

[0007] Moreover, the installation space of the synchronization valves connected in series and parallel is also limited by the quantity and volume. The more oil cylinders are used, the more synchronization valves and related pipelines are needed for motor synchronization, which takes up too much space. Therefore, a considerable number of engineering machinery equipment cannot be used due to space limitations. Summary of the invention

[0008] The purpose of the present invention is to provide an adjustable multi-outlet synchronous valve, which is mainly to solve the problems existing in the prior art of low synchronization accuracy, poor applicability, excessive system back pressure, low efficiency ratio, great processing difficulty, and installation space limited by quantity and volume.

[0009] The present invention will be implemented by taking the following technical measures: the present invention is based on an adjustable synchronous valve with one inlet and two outlets as a basic unit, by setting at least one or two basic units, and adding an additional unit connected by a first spiral connecting rod to the valve core at the end of the basic unit; or setting an integral body formed by connecting a second spiral connecting rod between any two adjacent basic units.

[0010] Compared with the prior art, the present invention has the following advantages and positive effects:

[0011] 1. The present invention adopts a modular single valve design of the basic unit and the additional unit in the valve body and can be processed and adjusted at one time, which can effectively avoid the dual effects of different precisions of different batches of products and the error superposition caused by series connection, thereby significantly improving the synchronization accuracy of the product.

[0012] 2. The semi-through-hole cone valve structure on the valve core can not only eliminate the geometric dimension processing error of the fixed throttle hole, but also adjust the size of the fixed throttle hole as needed when the system inlet flow changes, which significantly increases the applicability of the product.

[0013] 3. Since each chamber in the valve body is in parallel with one inlet and multiple outlets and the throttling hole area can be adjusted to the maximum pressure drop according to the theoretical threshold, no matter how many synchronous routes there are, the overall two-way flow back pressure is a fixed throttling hole and can reach the minimum pressure drop value of the hole. It fundamentally solves the problem of high back pressure and low efficiency ratio of the multi-cylinder synchronous system using synchronous valves that has troubled both at home and abroad for many years, making it a reality to use synchronous valve control for medium and low pressure hydraulic systems, especially low pressure multi-cylinder synchronous systems.

[0014] 4. The present invention adopts the organic coordination of the structure of the reversing sleeve and the pressure compensation sleeve and the valve core, and can utilize the relative covering effect of the hole groups between the two sleeves and the relative covering effect of the valve core and the reversing sleeve hole group to form a variable opening, thereby realizing the balanced adjustment of the pressure of each cavity; the traditional deep hole processing and cutting ring groove is transformed into a simple production of outer circle and through hole processing, which completely changes the traditional concept, greatly simplifies the processing technology and processing difficulty, and opens up a broader application path for the mass production of synchronous valves made of special materials such as harder carbon steel, high-hardness stainless steel, bearing steel, and easily deformed aluminum alloy.

[0015] 5. The present invention adopts a concentric rotary valve core, an arbitrary combination of basic units and a connection structure of a spiral connecting rod, so the volume can be flexibly designed according to the space required on site, effectively avoiding the problem of installation space being limited by quantity and volume.

[0016] 6. Compared with existing multi-way synchronous shunt motors, synchronous cylinders and other similar functional components, the present invention has novel inventive concept, compact and reasonable structure, high synchronization accuracy, simple processing technology, low cost and long life, stable and reliable performance, and obvious advantages in various application indicators, and has substantial characteristics and significant progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the one-in-three-out structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the load imbalance state of the outlet of the one-inlet and three-outlet device of the present invention;

[0019] Figure 3 It is a schematic diagram of the one-input and four-output structure of the present invention. DETAILED DESCRIPTION

[0020] Depend on Figure 1-Figure 3The adjustable multi-outlet synchronous valve of the present invention is a one-inlet and two-outlet adjustable synchronous valve as a basic unit, and the basic unit is mainly composed of a concentric rotary valve core 4 in the center hole of the valve body 1, a semi-through hole cone valve 3 symmetrically arranged in the channel of the valve core 4 and its corresponding two cavities A and B, and a pressure compensation sleeve 8, a reversing sleeve 5 and an installation sleeve 9 sequentially sleeved on the outside of the valve core 4. The valve core 4 is a cylindrical body with a recess in the middle part, and the reversing sleeve 5, the pressure compensation sleeve 8 and the installation sleeve 9 are all hollow cylindrical structures and are provided with corresponding hole groups, wherein the valve core 4, the reversing sleeve 5 and the pressure compensation sleeve 8 can slide relative to each other.

[0021] The present invention is divided into two different structural forms: when the number of multiple actuators is odd or even, at least one basic unit is provided, and of course, multiple basic units may be provided. An additional unit connected by a first spiral connecting rod 10 is provided on the valve core 4 at the end of one or more of the basic units. In addition to a cavity C having the same structure as the basic unit and a fixed throttling hole 12' and a semi-through hole cone valve 3' in the valve core 4' channel of the cavity, the additional unit has a reversing sleeve 5' sleeved on the outside of the valve core 4', and the reversing sleeve 5' is placed in the installation sleeve 9. The hole group on the installation sleeve 9 and the fixed throttling holes 12, 12' on the valve cores 4, 4' are communicated with the oil inlet 2 through the multi-way branch channel in the valve body 1. At the same time, the fixed throttling hole 12 on the valve core 4 is communicated with the pressure compensation sleeve hole group, and the pressure compensation sleeve hole group is also communicated with the reversing sleeve 5 with two rows of sub-flow hole groups. The outlet of the hole group of the installation sleeve 9 is also connected with the oil outlet of the valve body 1.

[0022] Figure 1 This is an example of a one-in-three-out structure with an additional unit when the number of actuators is an odd number of three. If the number of actuators is an odd number of five, an additional unit is added to two basic units, and the same applies to other odd number multi-outlet structures such as seven, nine, eleven, etc. When the number of actuators is an even number, at least two basic units must be set (such as Figure 3 ), of course, there can be more, at the same time, between two basic units or between any two adjacent basic units, the second screw connecting rod 10' is used to connect the two basic units or more than two basic units to form a whole. Figure 3 The example given is a one-input and four-output structure with four multi-actuators. When there are more than two basic units, the multi-actuators are six, eight, ten, etc., and so on. In this way, a synchronous structure design of one-input and N-output multi-actuators can be realized.

[0023] The following further describes the working state of the representative one-inlet-three-outlet and one-inlet-four-outlet synchronous valves of the present invention in conjunction with the accompanying drawings. Figure 1When the working state of the one-inlet-three-outlet structure synchronous valve shown is diversion, the pressure oil enters from the main oil inlet 2. At this time, the reversing valve sleeves 5 corresponding to the A and B chambers are separated to the left and right under the action of the inlet pressure, and the C chamber reversing valve sleeve 5' moves to the right, respectively closing their respective manifold groups 7, 7', and the pressure oil flows from their respective channels through the semi-through hole cone valves 3, 3' on the valve cores 4, 4' into the fixed throttle holes 12, 12', and enters the three chambers A, B, and C at the same time, and then flows out through the valve core hole group, the pressure compensation sleeve hole group, and the reversing valve sleeve diversion hole group 6, 6' through the valve body outlet T to drive the actuator. When the external load is equal, since the pressure of each chamber A, B, and C is the same, the area of ​​the fixed throttle holes 12, 12' where each chamber is located is also the same after being adjusted by the cone valves 3, 3', and the pressure difference of the fixed throttle holes through each chamber is also the same, so the power oil is evenly divided into three equal parts and flows out, driving the three actuators synchronously.

[0024] When any outlet load becomes larger (see Appendix Figure 2 , which is the position trend of the pressure of each component when the pressure on the outlet side of cavity A increases and forms a heavy load. Taking cavity A as an example, when the load increases, the pressure in cavity A increases (assuming that the outlets of cavities B and C are in the extreme working condition of empty load at this time), this pressure drives the pressure compensation sleeve 8 to move toward the low-pressure cavity B side, so that the opening of the diverter hole group 6 in cavity A becomes larger and the pressure decreases, and the opening of the diverter hole group 6 of the valve core in cavity B decreases, and the pressure increases. When the pressure is finally balanced with that in cavity A, the pressure compensation sleeve 8 stops moving and is in the pressure regulating servo state; during the movement of the pressure compensation sleeve 8, since there is also a load pressure difference between cavity A and cavity C, the valve core 4 and 4' will also be driven to move to the right side of cavity C at the same time, reducing the opening area of ​​the diverter hole group 6' in cavity C, so that the pressure in cavity C also increases to be consistent with that in cavity A and cavity B. During the movement of the valve core 4, its movement will affect the pressure change on the B chamber side, causing the pressure of the A and B chambers, which have been balanced, to change. However, with the pressure difference between the two chambers, the pressure compensation sleeve 8 will always move toward the low-pressure side, reduce the opening of the low-pressure side hole group, increase the pressure on the low-pressure side, and then make the pressure of the A and B chambers in a balanced state. This design allows the pressure of the A and B chambers to adjust the pressure balance of the two chambers through the servo movement of the pressure compensation sleeve 8. The movement of the valve core 4, 4' can also make the pressure of the A, B chamber and the C chamber reach dynamic equilibrium. Regardless of how the external load pressure changes, the pressure of the three chambers A, B, and C can always remain the same. Achieve equal flow output at each outlet. When the diversion state ends, the valve core 4, 4' and the pressure compensation sleeve 8 will return to the original state under the action of the springs 11, 11' at both ends of the valve body and the spring at the end of the pressure compensation sleeve 8, and prepare for the flow collection condition. When the load pressure of other outlets increases, the principle is the same as the A chamber condition. The flow direction is opposite during flow collection, and the principle is the same, which will not be repeated.

[0025] The operating principle of the one-inlet-four-outlet synchronous valve is the same as that of the one-inlet-three-outlet structure. The two basic units composed of cavities A, B and C, D first adjust the pressure on both sides of their cavities to be the same through their respective pressure compensation sleeves 8, and then adjust the pressure balance between the two basic units again through the movement of the concentric valve core 4; the logical order of adjusting the pressure difference of each cavity caused by the external load difference is: the A cavity and the B cavity are always adjusted to be the same, and the C cavity and the D cavity are always adjusted to be the same. When there is a difference in pressure between a single cavity of A, B and C, D, the valve core 4 starts to move and adjusts the pressure between the A, B and C, D cavities to be the same. The final result is that the pressure of each cavity of A, B, C, and D is balanced, and the flow returns to the four-equal state.

[0026] In addition to the above embodiments, any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An adjustable multi-outlet synchronous valve, characterized in that: A one-inlet and two-outlet adjustable synchronous valve is used as a basic unit, by providing at least one or two basic units, and adding an additional unit connected by a first spiral connecting rod (10) to the valve core (4) at the end of the basic unit; or providing an integral body connected by a second spiral connecting rod (10′) between any two adjacent basic units; The basic unit is mainly composed of a concentric rotary valve core (4) at the center of the valve body (1), a semi-through-hole cone valve (3) symmetrically arranged in the passage of the valve core (4) and its corresponding two cavities A and B, and a pressure compensation sleeve (8), a reversing sleeve (5) and a mounting sleeve (9) which are sequentially sleeved on the outside of the valve core (4); The additional unit comprises a cavity C, an additional valve core (4') located in the cavity C, and a fixed throttling hole (12') and a semi-through hole cone valve (3') located in a channel of the additional valve core (4'). The cavity C, the fixed throttling hole (12') and the semi-through hole cone valve (3') are identical to the corresponding structures in the basic unit. A reversing sleeve (5') is sleeved on the outside of the additional valve core (4'), and the reversing sleeve (5') is placed in the mounting sleeve (9). The valve core (4) in the basic unit is a cylindrical body with a recess in the middle, while the reversing sleeve (5), the pressure compensating sleeve (8) and the mounting sleeve (9) are all hollow cylindrical structures and are provided with corresponding hole groups, wherein the valve core (4), the reversing sleeve (5) and the pressure compensating sleeve (8) can slide relative to each other; The hole group on the installation sleeve (9) and the fixed throttle holes (12, 12') on the valve core (4) and the additional valve core (4') are connected to the oil inlet (2) through a multi-way branch channel in the valve body (1). At the same time, the fixed throttle hole (12) on the valve core (4) is connected to the pressure compensation sleeve hole group, and the pressure compensation sleeve hole group is connected to the reversing sleeve (5) with two rows of flow distribution hole groups. The outlet of the hole group of the installation sleeve (9) is also connected to the oil outlet of the valve body (1).

2. The adjustable multi-outlet synchronous valve according to claim 1, characterized in that: The first screw connecting rod (10) and the second screw connecting rod (10′) are connecting components with connecting threads at both ends.

3. The adjustable multi-outlet synchronous valve according to claim 1, characterized in that: The oil inlet (2) and the oil outlet are opened as required at radial positions of the valve body (1).

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