Flow valve

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a flow valve. A flow valve includes: a valve body; the valve element is assembled in the valve body in a sliding mode, and control cavities are formed in the two ends of the valve element respectively. The driver is used for controlling the oil inlet and outlet of the control cavity so as to control the position of the valve core; and the feedback rod is kept to abut against the valve element, and the position of the valve element is fed back to the driver through the feedback rod. According to one embodiment of the utility model, the driver is a can bus electro-hydraulic driver. The technical problems that in the prior art, a flow valve is low in adjusting precision, and the position of a valve element cannot be accurately controlled are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a flow valve. Background Art

[0002] In the prior art, most proportional flow valves are composed of a proportional electromagnet and a flow valve. The proportional electromagnet replaces the manual adjustment device of the throttle valve or the speed regulating valve, and changes the opening of the throttle valve by inputting an electrical signal, thereby adjusting the flow of the system. Under the action of the proportional electromagnet, the proportional flow valve can realize proportional control of the pressure, flow and other parameters of the hydraulic system. The so-called proportional control is to control the moving distance of the proportional valve core by changing the current value passed through the internal coil of the proportional electromagnet through the controller, thereby changing the opening amount of the proportional valve port to realize proportional control.

[0003] For example, the document with application number CN202123255497.6 discloses a proportional flow valve controlled by magnetostrictive direct drive, including a shell, an upper cover is installed on the upper end of the shell, two left-right symmetrical wiring terminals are installed on the upper end of the upper cover, coil wires are arranged on the upper ends of the wiring terminals, an initial adjustment screw is arranged on the upper end of the upper cover, connecting pipes are installed on the left and right parts of the outer surface of the shell, and a first installation cavity, a second installation cavity and a third installation cavity are arranged in sequence from top to bottom inside the shell, a coil assembly is arranged in the first installation cavity, a magnetostrictive rod is arranged in the second installation cavity, a sealing valve is installed at the output end of the magnetostrictive rod, the sealing valve is located in the third installation cavity, a sealing spring is commonly arranged between the lower end of the sealing valve and the lower wall of the third installation cavity, the lower end of the initial adjustment screw extends into the second installation cavity, and the lower end of the initial adjustment screw is in close contact with the upper end of the magnetostrictive rod.

[0004] The proportional flow valve in the above document adjusts the current passed into the coil assembly to generate a corresponding magnetic field strength, controls the extension distance of the magnetostrictive rod, and then controls the flow of the flow valve. Although it can control the flow, it cannot accurately control the position of the valve core and has low adjustment accuracy. Utility Model Content

[0005] In order to solve the technical problem that the flow valve in the prior art has low adjustment accuracy and cannot accurately control the position of the valve core, the utility model provides a flow valve to solve the above technical problem.

[0006] In order to solve the above technical problems, the utility model provides a flow valve, comprising:

[0007] Valve body;

[0008] A valve core, the valve core is slidably assembled in the valve body, and control cavities are formed at both ends of the valve core;

[0009] A driver, the driver controls the oil inflow and outflow of the control chamber to control the position of the valve core;

[0010] A feedback rod is kept against the valve core, and the position of the valve core is fed back to the driver through the feedback rod.

[0011] According to one embodiment of the utility model, the driver is a CAN bus electro-hydraulic driver.

[0012] According to one embodiment of the utility model, the control chambers at both ends of the valve core are control chamber a and control chamber b respectively, the control chamber b is arranged close to the driver, and the feedback rod abuts against the end of the valve core located in the control chamber b; the driver includes a switch valve a and a switch valve b, the switch valve a controls the oil in and out of the control chamber a; the switch valve b controls the oil in and out of the control chamber b.

[0013] According to an embodiment of the utility model, an elastic component is provided at the end of the valve core close to the control chamber a, and the elastic component provides a buffering force for the valve core.

[0014] According to one embodiment of the utility model, the elastic component includes a connecting rod assembled on the end of the valve core, and an elastic member and a spring seat are sleeved on the connecting rod. Both ends of the elastic member abut against the spring seat, and the spring seat can be limited by the inner surface of the control chamber a.

[0015] According to an embodiment of the utility model, it also includes an adjusting member, which is assembled in an adjustable position, and one end of the adjusting member extends into the control chamber a to adjust the position of the valve core by pushing a connecting rod.

[0016] According to an embodiment of the utility model, an oil passing groove is formed on the outer peripheral surface of the valve core, one axial end of the oil passing groove is transitioned through a control edge, and the other axial end of the oil passing groove is transitioned through b control edge.

[0017] According to an embodiment of the utility model, a weight-reducing groove is formed at the end of the valve core.

[0018] According to an embodiment of the utility model, an oil inlet and an oil outlet are formed on the valve body, and the valve core slides to control the flow from the oil inlet to the oil outlet.

[0019] According to one embodiment of the utility model, the valve body is provided with a driver oil supply port and a driver oil outlet, and the driver oil supply port and the driver oil outlet are connected with the control chamber under the control of the driver; the valve body is also provided with an overflow valve to control the oil supply pressure of the driver.

[0020] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0021] The flow valve of the utility model is provided with a driver to control the oil in and out of the control chambers at both ends of the valve core, and the valve core is slid to control the flow by oil pressure. The position of the valve core can also be fed back to the driver through the feedback rod. After the driver knows the position of the valve core, it can accurately adjust the position of the valve core, thus realizing closed-loop control with high control accuracy. The driver adopts a CAN bus electro-hydraulic driver with high accuracy, can realize stepless speed regulation, fast response and small hysteresis loop.

[0022] In the flow valve of the utility model, an elastic component is arranged at the end of the valve core, and the elastic component can provide a buffer force for the valve core during its sliding process; in addition, the connecting rod can also cooperate with the adjusting member, and when the CAN bus electro-hydraulic driver fails, the adjusting member can push the connecting rod by rotating the adjusting member, thereby adjusting the position of the valve core;

[0023] The flow valve of the utility model forms an oil groove on the valve core, and the two ends of the oil groove are respectively transitioned through the control edge a and the control edge b, so that the valve core can control the flow when it moves left and right, increasing redundancy and improving reliability; the valve core is also provided with a weight reduction groove, which can reduce the weight of the valve core and improve the response speed;

[0024] The flow valve of the utility model is provided with a driver oil supply port and a driver oil outlet on the valve body, so that the driver can control the oil inlet and outlet of the two control chambers, thereby controlling the position of the valve core; the setting of the overflow valve can be used to stabilize the driver oil supply pressure and protect the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the flow valve of the utility model;

[0026] Figure 2 It is a cross-sectional view of the flow valve;

[0027] Figure 3 It is a structural schematic diagram of the valve body;

[0028] Figure 4 It is a schematic diagram of the structure after the valve core and elastic component are assembled;

[0029] Figure 5 This is the hydraulic principle diagram of the flow valve;

[0030] Figure 6 This is the state diagram when the valve core moves to the left;

[0031] Figure 7 This is the state diagram when the valve core moves to the right;

[0032] In the figure: 1-valve body; 11-mounting hole; 12-first oil channel; 13-second oil channel; P-oil inlet; A-oil outlet; X-driver oil inlet; Y-driver oil outlet; 2-valve core; 21-oil groove; 211-a control edge; 212-b control edge; 22-weight reduction groove; 3-driver; 31-a switch valve; 32-b switch valve; 4-feedback rod; 5-elastic component; 51-connecting rod; 52-elastic member; 53-first spring seat; 54-second spring seat; 55-limiting member; 6-adjusting member; 7-overflow valve; 8-end cover; 81-a control chamber; 9-transition block; 91-b control chamber; 10-filter. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0036] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0039] like Figure 1-7 As shown, this embodiment provides a flow valve, including a valve body 1, a valve core 2 and a driver 3. The valve core 2 is slidably assembled in the valve body 1, and is used to control the flow from the oil inlet P to the oil outlet A; control chambers are respectively formed at both ends of the valve core 2, and the driver 3 controls the oil in and out of the two control chambers, so that the valve core 2 slides along the valve body 1 under the oil pressure of the control chambers at both ends.

[0040] The valve body 1 is block-shaped, and a mounting hole 11 is provided in the valve body 1 for slidingly assembling the valve core 2. An oil inlet P and an oil outlet A are formed on the valve body 1. The oil inlet P is connected to the mounting hole 11 through a first oil passage 12; the oil outlet A is connected to the mounting hole 11 through a second oil passage 13.

[0041] As a preferred technical solution of this embodiment, the mounting hole 11 passes through the valve body 1 and extends along the axis.

[0042] As a preferred technical solution of this embodiment, in order to realize the oil inlet and outlet of the control chamber, a driver oil inlet X and a driver oil outlet Y are also formed on the valve body 1, and the driver oil inlet X and the driver oil outlet Y are respectively connected to the driver through oil channels.

[0043] As a preferred technical solution of this embodiment, in order to set the control chambers at both ends of the valve core 2, an end cover 8 is fixed on one side of the valve body 1, and the end cover 8 is a hollow structure with an opening at one end. The end cover 8 is connected to one end of the mounting hole 11, and a control chamber a is formed in the end cover 8; a transition block 9 is fixed on the other side of the valve body 1, and an internal space with an opening connected to the other end of the mounting hole 11 is formed in the transition block 9, and the internal space cooperates with the connected part of the mounting hole 11 to form a control chamber b 91.

[0044] The valve core 2 is slidably assembled in the mounting hole 11 . The valve core 2 is a rod-shaped structure. An oil groove 21 is formed on the outer peripheral surface of the valve core 2 . The oil entering through the oil inlet P reaches the oil outlet A through the oil groove 21 .

[0045] As a preferred technical solution of this embodiment, one axial end of the oil groove 21 transitions through the a control edge 211, and the other axial end of the oil groove 21 transitions through the b control edge 212. The a control edge 211 and the b control edge 212 can be arcuate edges or beveled edges. In this embodiment, the a control edge 211 is set as an arcuate edge, and the b control edge 212 is set as a beveled edge.

[0046] As a preferred technical solution of this embodiment, in order to control the weight of the valve core 2, a weight reduction groove 91 is provided at the end of the valve core 2. The weight reduction groove 91 can be provided as an annular groove.

[0047] The driver 3 is assembled on the valve body 1 through the transition block 9, and the driver 3 is fixed on the other side of the transition block 9 away from the valve body 1. The driver 3 includes an a switch valve 31 and a b switch valve 32, which can be inserted into the transition block 9, and the driver oil inlet X and the driver oil outlet Y are both connected to the a switch valve 31 and the b switch valve 32, and the a switch valve 31 is connected to the a control chamber 81 through the oil passage in the transition block 9 and the valve body 1; the b switch valve 31 is connected to the b control chamber 91 through the oil passage in the transition block 9.

[0048] As a preferred technical solution of this embodiment, the driver 3 is a CAN bus electro-hydraulic driver. The a switch valve 31 and the b switch valve 32 are preferably high-speed switch valves.

[0049] As a preferred technical solution of this embodiment, the movement position of the valve core 2 is fed back to the driver 3 via the feedback rod 4. Specifically, one end of the feedback rod 4 can extend into the b control chamber 91 and elastically rest against the end of the valve core 2 located in the b control chamber 91; the other end of the feedback rod 4 can extend into the driver 3 to feed back the movement position of the valve core 2 to the driver 3.

[0050] An elastic component 5 is provided at one end of the valve core 2 close to the control chamber a 81. The elastic component 5 includes a connecting rod 51, an elastic member 52 and two spring seats. The connecting rod 51 can be coaxially assembled with the valve core 2. The elastic member 52 and the two spring seats are both slidably sleeved on the connecting rod 51. The elastic member 52 is located between the two spring seats. The two ends of the elastic member 52 act on the two spring seats respectively. The elastic member 52 can be selected from but not limited to a spring.

[0051] As a preferred technical solution of this embodiment, the connecting rod 51 can be set as a screw, and the threaded end of the screw can be threadedly assembled with the valve core 2, and there is a diameter difference between the screw and the valve core 2; the two spring seats are respectively the first spring seat 53 and the second spring seat 54. In the initial state, under the action of the elastic member 52, the first spring seat 53 can be against the head of the screw, and the second spring seat 54 can be against the end face of the valve core 2. During assembly, the elastic component 5 can be assembled in the control chamber a 81. When the valve core 2 slides, the first spring seat 53 can be pressed against the limit by the screw head or the inner bottom surface of the end cover 8, and the second spring seat 54 can be pressed against the limit by the valve core 2 or the valve body 1.

[0052] As a preferred technical solution of this embodiment, in order to limit the sliding range, a limit member 55 is further provided. The limit member 55 is sleeved on the connecting rod 51 and is located between the first spring seat 53 and the second spring seat 54. The limit member 55 can be axially connected to the first spring seat 53; or, the limit member 55 is axially connected to the second spring seat 54; or, the limit member 55 is not connected to either the first spring seat 53 or the second spring seat 54.

[0053] As a preferred technical solution of this embodiment, an adjusting member 6 is mounted on the end cover 8, and the adjusting member 6 can adjust the position of the valve core 2 by pushing the connecting rod 51. The adjusting member 6 can be set as a screw, which is threadedly connected to the end cover 8. The length of the screw extending into the a control chamber 81 can be adjusted by rotating the screw. When the CAN bus electro-hydraulic driver fails, the valve core 2 can be moved by rotating the screw. Preferably, a truncated cone is formed at one end of the adjusting member 6 located inside the a control chamber 81, which can achieve a limiting effect and prevent the adjusting member 6 from detaching from the end cover 8. After the adjusting member 6 is adjusted into place, it can be locked by a sealing nut.

[0054] In order to stabilize the oil supply pressure of the driver 3 and protect the driver 3 , a relief valve 7 may be provided on the valve body 1 , and the relief valve 7 may be a pressure reducing relief valve.

[0055] In order to improve the anti-pollution capability, a filter screen 10 is further provided. The filter screen 10 is assembled on the valve body 1 to filter the oil entering through the oil inlet X of the driver.

[0056] Based on the above structure, the working principle of the flow valve of this embodiment is:

[0057] When there is no signal from the CAN bus electro-hydraulic driver, neither the a switch valve 31 nor the b switch valve 32 discharges oil, the valve core 2 is in the middle position, and the oil at the oil inlet P flows to the oil outlet A through the valve core 2;

[0058] When the CAN bus electro-hydraulic driver has a signal and the a switch valve 31 discharges oil, the pressure oil reaches the a control chamber 81 through the oil channel, causing the valve core 2 to move to the right, and the oil at the oil inlet P flows to the oil outlet A through the a control edge 211 of the valve core 2. By adjusting the size of the signal, the valve core 2 can be operated at any position to achieve flow control;

[0059] When the CAN bus electro-hydraulic driver has a signal and the b switch valve 32 discharges oil, the pressure oil reaches the b control chamber 91 through the flow channel, causing the valve core 2 to move to the left, and the oil at the oil inlet P flows to the oil outlet A through the control edge b212 of the valve core 2. By adjusting the size of the signal, the valve core 2 can work at any position to achieve flow control;

[0060] When the CAN bus electro-hydraulic driver fails, the valve core 2 is moved to the right by rotating the adjusting member 6, and the oil at the oil inlet P flows to the oil outlet A through the control edge a 211 of the valve core 2, thereby realizing flow control.

[0061] The valve core 2 can be moved left and right to control the flow rate, thereby increasing redundancy and improving reliability. In addition, the position of the valve core 2 can be manually adjusted to control the flow rate.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A flow valve, characterized in that: include: Valve body (1); A valve core (2), the valve core (2) being slidably assembled in the valve body (1), and control cavities are respectively formed at two ends of the valve core (2); A driver (3), the driver (3) controlling the oil inlet and outlet of the control chamber to control the position of the valve core (2); A feedback rod (4), wherein the feedback rod (4) is kept in contact with the valve core (2), and the position of the valve core (2) is fed back to the driver (3) via the feedback rod (4).

2. A flow valve according to claim 1, characterized in that: The driver (3) is a CAN bus electro-hydraulic driver.

3. A flow valve according to claim 1, characterized in that: The control chambers at both ends of the valve core (2) are respectively an a control chamber (81) and a b control chamber (91); the b control chamber (91) is arranged close to the driver (3); the feedback rod (4) abuts against an end of the valve core (2) located in the b control chamber (91); the driver (3) comprises an a switch valve (31) and a b switch valve (32); the a switch valve (31) controls the inlet and outlet of oil of the a control chamber (81); and the b switch valve (32) controls the inlet and outlet of oil of the b control chamber (91).

4. A flow valve according to claim 3, characterized in that: An elastic component (5) is provided at the end of the valve core (2) close to the a control chamber (81), and the elastic component (5) provides a buffer force for the valve core (2).

5. A flow valve according to claim 4, characterized in that: The elastic component (5) comprises a connecting rod (51) mounted on the end of the valve core (2), an elastic member (52) and a spring seat being sleeved on the connecting rod (51), two ends of the elastic member (52) being in contact with the spring seat, and the spring seat can be limited by the inner surface of a control chamber (81).

6. A flow valve according to claim 5, characterized in that: It also comprises an adjusting member (6), wherein the adjusting member (6) is assembled in an adjustable position, and one end of the adjusting member (6) extends into the a control chamber (81) to adjust the position of the valve core (2) by pushing a connecting rod (51).

7. A flow valve according to claim 1, characterized in that: An oil passage groove (21) is formed on the outer peripheral surface of the valve core (2), one axial end of the oil passage groove (21) transitions through a control edge a (211), and the other axial end of the oil passage groove (21) transitions through a control edge b (212).

8. A flow valve according to claim 1, characterized in that: A weight-reducing groove (22) is formed at the end of the valve core (2).

9. A flow valve according to claim 1, characterized in that: An oil inlet (P) and an oil outlet (A) are formed on the valve body (1), and the valve core (2) slides to control the flow from the oil inlet (P) to the oil outlet (A).

10. A flow valve according to claim 1, characterized in that: The valve body (1) is provided with a driver oil supply port (X) and a driver oil outlet port (Y), and the driver oil supply port (X) and the driver oil outlet port (Y) are connected to the control chamber under the control of the driver (3); the valve body (1) is also provided with a relief valve (7) to control the oil supply pressure of the driver (3).

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