Speed regulating valve with reversing function

Abstract

The speed regulating valve with the reversing function comprises a valve body, an oil port P, an oil port A, an oil port B and an oil port T are formed in the valve body, the oil port P is arranged to be an oil inlet, the oil port A and the oil port B are connected with a system execution element, the oil port T is arranged to be an oil return port and is externally connected with an oil tank, and an oil channel is formed in the valve body. A fixed differential pressure reducing valve core and a reversing valve throttling valve core are mounted in the oil duct; when a throttling valve element of the reversing valve is located on the left side or the right side, the magnitude of current of the electromagnetic controller can be adjusted to change the magnitude of electromagnetic force pushing the valve element to move, and therefore the displacement distance of the valve element and the area of a throttling opening are adjusted, and the functions of liquid flow reversing and speed adjusting can be achieved; therefore, it is guaranteed that the speed of an execution element is stable, loop energy loss can be effectively reduced, loop efficiency is improved, hydraulic impact is reduced, and working stability and reliability of a hydraulic system are improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a speed regulating valve with a reversing function. Background Art

[0002] The flow control valve is an important control element in the hydraulic system. It is mainly used to control the flow in the hydraulic system and thus control the speed of the actuator. The flow control valve includes a simple throttle valve and a speed regulating valve. The transmission speed regulating valve is generally composed of a differential pressure reducing valve and a throttle valve in series. Among them, the differential pressure reducing valve can automatically compensate for the influence of load changes, so that the pressure difference before and after the throttle valve is a constant value, eliminating the influence of load changes on the flow, and realizing precise control of the speed of the actuator. In the application of hydraulic systems, some actuators need to work at multiple speeds, and some machine tools require two feed speeds in the working stroke. Generally, the first feed speed is greater than the second feed speed. In order to achieve two working speeds, two speed regulating valves are often connected in series or in parallel in the circuit, and switched by a reversing valve.

[0003] The following problems exist: the traditional two-way speed switching circuit connects two speed control valves in series or in parallel. Due to the limitations of the structure and working principle of the traditional speed control valve, it is inevitable to produce large energy losses or sudden forward surges of the working parts, affecting the hydraulic system's sensitive response and stable and reliable working requirements. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A speed regulating valve with a reversing function comprises a valve body, wherein the valve body is provided with an oil port P, an oil port A, an oil port B and an oil port T, the oil port P is arranged as an oil inlet, the oil port A and the oil port B are connected to a system actuator, the oil port T is arranged as an oil return port and is externally connected to an oil tank, an oil passage is arranged inside the valve body, and a slidable differential pressure reducing valve core and a reversing valve throttle valve core are installed inside the oil passage, the internal space of the oil passage in the valve body is interconnected with the oil port P, the oil port A, the oil port B and the oil port T, a throttling structure is arranged in the reversing valve throttle valve core, and the throttling structure can block the oil port A and the oil port B.

[0007] As a further description of the above technical solution:

[0008] By adjusting the position of the throttle valve core (3) of the reversing valve, the flow rate can be adjusted through the throttling structure. The flow rate calculation formula obtained by the system actuator is Q = KAT Dp m , where K is the flow system, A T is the throttle area, and Dp is the pressure difference before and after the throttle.

[0009] As a further description of the above technical solution:

[0010] A rodless cavity is opened on one side of the valve core of the differential pressure reducing valve, and a spring is connected to one end of the inner wall of the rodless cavity. Electromagnetic controllers are installed at both ends of the valve body. Both ends of the throttle valve core of the reversing valve extend into the interior of the electromagnetic controller. The oil passage of the throttle valve core of the reversing valve is connected to the oil port A, the oil port B and the oil port, and the oil passage of the valve core of the differential pressure reducing valve is connected to the oil port P and the rodless cavity.

[0011] As a further description of the above technical solution:

[0012] The throttle valve core of the reversing valve is composed of a valve stem and two groups of throttling structures, and the two groups of throttling structures are fixed at both ends of the valve stem. The outer wall of the throttling structure in the throttle valve core of the reversing valve can slide closely against the inner wall of the oil channel where the throttle valve core of the reversing valve is placed, and there is a gap between the outer wall of the valve stem in the throttle valve core of the reversing valve and the inner wall of the oil channel where the throttle valve core of the reversing valve is placed.

[0013] As a further description of the above technical solution:

[0014] When one group of the electromagnetic controllers is energized, the throttle valve core of the reversing valve will move toward the direction of the other group of electromagnetic controllers under the action of electromagnetic force. When the other group of the electromagnetic controllers is energized, the throttle valve core of the reversing valve will move toward the direction of one group of electromagnetic controllers.

[0015] As a further description of the above technical solution:

[0016] The differential pressure-reducing valve core is composed of a large square valve body, a rectangular valve body, a valve stem and a small square valve body. One side of the large square valve body in the differential pressure-reducing valve core is fixedly connected to the movable end of the spring, the other side of the large square valve body in the differential pressure-reducing valve core is fixedly connected to one side of the rectangular valve body in the differential pressure-reducing valve core, the other side of the rectangular valve body in the differential pressure-reducing valve core is fixedly connected to one end face of the valve stem in the differential pressure-reducing valve core, and the other end face of the valve stem in the differential pressure-reducing valve core is fixedly connected to one side of the small square valve body in the differential pressure-reducing valve core.

[0017] As a further description of the above technical solution:

[0018] The outer walls of the rectangular valve body and the small square valve body in the differential pressure reducing valve core can slide closely against the inner wall of the oil passage where the differential pressure reducing valve core is placed.

[0019] As a further description of the above technical solution:

[0020] There is a gap between the valve stem in the differential pressure reducing valve core and the inner wall of the oil passage where the differential pressure reducing valve core is placed, and the gap is configured as an oil port C.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: when the throttle valve core of the reversing valve is on the left or right side, the current of the electromagnetic controller can be adjusted to change the electromagnetic force that pushes the valve core to move, thereby adjusting the displacement distance of the valve core and the throttling port area, and realizing the functions of liquid flow reversing and speed regulation. If the load fluctuates, the pressure in the oil chamber on the left side of the differential pressure reducing valve core will fluctuate accordingly, thereby ensuring the stability of the actuator speed, effectively reducing the circuit energy loss, improving the circuit efficiency, reducing hydraulic shock, and improving the stability and reliability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 A top view of the present invention;

[0024] Figure 3 It is a schematic diagram of the throttle valve core of the reversing valve in the present invention being in the middle position;

[0025] Figure 4 It is a schematic diagram of the throttle valve core of the reversing valve in the present invention being in the left position;

[0026] Figure 5 It is a schematic diagram of the throttle valve core of the reversing valve in the present invention being in the right position;

[0027] Figure 6 It is a structural diagram of the oil channel of the oil return port in the present invention;

[0028] Figure 7 It is a traditional two-inlet speed regulating valve series circuit.

[0029] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0030] 1. Solenoid controller; 2. Valve body; 3. Throttle valve core of reversing valve; 4. Spring; 5. Valve core of differential pressure reducing valve. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it an embodiment that is separate or selectively mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0034] Reference Figure 1 , Figure 2 and Figure 3 , which is a structural schematic diagram, a top view and a schematic diagram of a reversing valve throttle core in the middle position of a speed regulating valve with a reversing function disclosed in the present invention, including a valve body 2, and the valve body 2 is provided with oil ports P, A, B and T, the oil port P is set as an oil inlet, the oil port A and the oil port B are connected to the system actuator, the oil port T is set as an oil return port and is externally connected to the oil tank, an oil channel is opened inside the valve body 2, and a differential pressure reducing valve core 5 and a reversing valve throttle core 3 are installed inside the oil channel, the oil flows from the oil port P through the differential pressure reducing valve core 5 and the reversing valve throttle core 3 to the actuator, a rodless cavity is opened on one side of the differential pressure reducing valve core 5, and one end of the inner wall of the rodless cavity is connected to the spring 4, and an electromagnetic controller 1 is installed at both ends of the valve body 2.

[0035] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 , which is a structural diagram of the oil channel of a speed regulating valve with a reversing function disclosed in the present invention and a schematic diagram of the throttle valve core of the reversing valve in different positions. When one group of electromagnetic controllers 1 is energized, the throttle valve core 3 of the reversing valve will move toward the direction of the other group of electromagnetic controllers 1 under the action of electromagnetic force; similarly, when the other group of electromagnetic controllers 1 is energized, the throttle valve core 3 of the reversing valve will move toward the direction of the one group of electromagnetic controllers 1.

[0036] The throttle valve core 3 of the reversing valve is provided with a throttling structure. Under the action of different electromagnetic forces, the displacement distance of the throttle valve core 3 of the reversing valve is different, so the throttle port area formed by the throttle valve core 3 of the reversing valve and the valve body 2 is different. Flow rate of the input actuator

[0037] Q=KA T Dp m ①

[0038] Among them, K is the flow system, A Tis the throttle area, and Dp is the pressure difference before and after the throttle.

[0039] Reference Figure 3 , which is a structural schematic diagram, front view and front sectional view of a speed regulating valve with a reversing function disclosed in the present invention. When the electromagnetic controllers 1 on both sides are not energized, the throttle valve core 3 of the reversing valve of the speed regulating valve is in the middle position, and the oil ports of the valve body 2 are not connected to each other.

[0040] Reference Figure 4 and Figure 6 It is a structural schematic diagram, front view and front sectional view of a speed regulating valve with a reversing function disclosed in the present invention. When the right electromagnetic controller 1 is energized and the left electromagnetic controller 1 is not energized, the throttle valve core 3 of the reversing valve will move to the left, the oil inlet P is connected with the oil outlet A, and the high-pressure oil flows into the rodless chamber of the hydraulic cylinder; the oil port T is connected with the oil outlet B, and the return oil of the rod chamber flows through the oil port B and returns to the oil tank through the oil port T.

[0041] Reference Figure 5 and Figure 6 It is a structural schematic diagram, front view and front sectional view of a speed regulating valve with a reversing function disclosed in the present invention. When the left electromagnetic controller 1 is energized and the right electromagnetic controller 1 is not energized, the throttle valve core 3 of the reversing valve will move to the right, the oil inlet P is connected with the oil outlet B, and the high-pressure oil flows into the rod chamber of the hydraulic cylinder; the oil port T is connected with the oil port A, and the return oil of the rodless chamber flows through the oil port A and returns to the oil tank through the oil port T.

[0042] If the load fluctuates, the pressure in the oil chamber on the left side of the differential pressure reducing valve core 5 will fluctuate accordingly. For example, when the load increases, the pressure on the right side of the differential pressure reducing valve core 5, that is, P A Increase, so that the differential pressure reducing valve core 5 moves to the left, the oil port C opening increases, the valve port fluid resistance decreases, such as Figure 4 The P shown m As it increases, the pressure difference DpP before and after the throttle m -P A Therefore, the pressure difference before and after the throttle port remains basically unchanged. Conversely, when the load becomes smaller, the above actions are reversed, and similarly, the pressure difference before and after the throttle port remains unchanged.

[0043] As shown in formula ①, the speed control valve works within the set throttling area to complete the speed control function. The current of the electromagnetic controller 1 is adjusted to adjust different throttling areas and change different working speeds at the same time. When the load fluctuates, the proposed speed control valve can automatically adjust the pressure changes caused by load changes to ensure the stability of the actuator speed.

[0044] When the throttle valve core 3 of the reversing valve is on the left or right side, the current of the electromagnetic controller 1 can be adjusted to change the electromagnetic force that pushes the valve core to move, thereby adjusting the displacement distance of the valve core and the throttle port area, thereby changing the flow entering the actuator, as shown in formula ①, to achieve the speed regulation function of the actuator.

[0045] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A speed regulating valve with a reversing function, comprising a valve body (2), characterized in that: The valve body (2) is provided with an oil port P, an oil port A, an oil port B and an oil port T, the oil port P is configured as an oil inlet, the oil port A and the oil port B are connected to the system actuator, the oil port T is configured as an oil return port and is externally connected to an oil tank, an oil passage is provided inside the valve body (2), and a slidable differential pressure reducing valve core (5) and a reversing valve throttle core (3) are installed inside the oil passage, the internal space of the oil passage in the valve body (2) is interconnected with the oil port P, the oil port A, the oil port B and the oil port T, and a throttle structure is provided in the reversing valve throttle core (3), and the throttle structure can block the oil port A and the oil port B.

2. The speed regulating valve with reversing function according to claim 1, characterized in that: By adjusting the position of the throttle valve core (3) of the reversing valve, the flow rate can be adjusted through the throttling structure. The flow rate calculation formula obtained by the system actuator is Q = KA T Dp m , where K is the flow system, A T is the throttle area, and Dp is the pressure difference before and after the throttle.

3. The speed regulating valve with reversing function according to claim 1, characterized in that: A rodless cavity is provided on one side of the differential pressure reducing valve core (5), and a spring (4) is connected to one end of the inner wall of the rodless cavity. Electromagnetic controllers (1) are installed at both ends of the valve body (2). Both ends of the throttle valve core (3) of the reversing valve extend into the interior of the electromagnetic controller (1). The oil passage of the throttle valve core (3) of the reversing valve is connected to the oil port A, the oil port B and the oil port, and the oil passage of the differential pressure reducing valve core (5) is connected to the oil port P and the rodless cavity.

4. The speed regulating valve with reversing function according to claim 1, characterized in that: The reversing valve throttle valve core (3) is composed of a valve stem and two groups of throttle structures, and the two groups of throttle structures are fixed at both ends of the valve stem. The outer wall of the throttle structure in the reversing valve throttle valve core (3) can slide closely against the inner wall of the oil passage where the reversing valve throttle valve core (3) is placed, and there is a gap between the outer wall of the valve stem in the reversing valve throttle valve core (3) and the inner wall of the oil passage where the reversing valve throttle valve core (3) is placed.

5. The speed regulating valve with reversing function according to claim 1, characterized in that: When one set of the electromagnetic controllers (1) is energized, the throttle valve core (3) of the reversing valve will move in the direction of the other set of electromagnetic controllers (1) under the action of the electromagnetic force; and when the other set of the electromagnetic controllers (1) is energized, the throttle valve core (3) of the reversing valve will move in the direction of the one set of electromagnetic controllers (1).

6. The speed regulating valve with reversing function according to claim 1, characterized in that: The differential pressure reducing valve core (5) is composed of a large square valve body, a rectangular valve body, a valve stem and a small square valve body; one side of the large square valve body in the differential pressure reducing valve core (5) is fixedly connected to the movable end of the spring (4); the other side of the large square valve body in the differential pressure reducing valve core (5) is fixedly connected to one side of the rectangular valve body in the differential pressure reducing valve core (5); the other side of the rectangular valve body in the differential pressure reducing valve core (5) is fixedly connected to one end face of the valve stem in the differential pressure reducing valve core (5); and the other end face of the valve stem in the differential pressure reducing valve core (5) is fixedly connected to one side of the small square valve body in the differential pressure reducing valve core (5).

7. The speed regulating valve with reversing function according to claim 1, characterized in that: The outer walls of the rectangular valve body and the small square valve body in the differential pressure reducing valve core (5) can slide closely against the inner wall of the oil passage where the differential pressure reducing valve core (5) is placed.

8. The speed regulating valve with reversing function according to claim 1, characterized in that: There is a gap between the valve stem in the differential pressure reducing valve core (5) and the inner wall of the oil passage where the differential pressure reducing valve core (5) is placed, and the gap is configured as an oil port C.

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