Multi-way valve group throttling mechanism

Abstract

The utility model is applicable to the technical field of control valves, and provides a multi-way valve group throttling mechanism, which comprises a valve body, a movable valve core, an arc-shaped shaft shoulder, an effusion groove and a throttling groove, the valve core is provided with a driving connecting hole and a plurality of sealing shaft shoulders, the valve core is matched with a linear driving mechanism to realize accurate control, and a one-way valve and a plurality of throttling grooves are arranged in an oil cavity. According to the utility model, the height difference of the arc-shaped shaft shoulder is utilized to trigger and close the one-way valve for providing hydraulic pressure in the lifting joint, and the arc-shaped shaft shoulder and the effusion grooves at the two sides of the arc-shaped shaft shoulder are arranged to provide a buffer space for the backflow of the oil in the oil cavity, so that the flow speed of the oil can be adjusted conveniently, and the hydraulic cylinder sinking and the tool abrasion can be effectively reduced. The symmetrical throttling grooves are formed in the valve element and used for providing a buffer space for oil backflow when the valve element returns to the neutral position, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a throttling mechanism for a multi-way valve group. Background Art

[0002] Multi-way valve groups mostly adopt a unified modular design, which can provide reliable system solutions for manufacturers of engineering vehicles. Users can make different combinations of valve bodies according to functional requirements, which is simple and reliable. Therefore, multi-way valves are applied in fields such as excavators, small loaders, wheel loaders, drills, forklifts, mining machines, and agricultural machines.

[0003] In existing vehicles using hydraulic locks, corresponding throttling grooves are provided inside to regulate the flow rate inside the valve body. Movable tools such as plows connected to tractors are likely to cause wear to the tools and the valve group when falling at a relatively fast speed. Therefore, it is necessary to optimize the throttling device of the multi-way valve group.

[0004] Chinese Patent with application number 201020269236.2 discloses a spool rod for a multi-way valve, including a rod body, a right limit shoulder, a second sealing shoulder, a right oil passage groove, and a fourth protrusion on the rod body. A right unloading groove communicating with the right oil passage groove is provided on the second sealing shoulder, and a right oil inlet groove communicating with the right oil passage groove is provided on the fourth protrusion. Through a plurality of oil grooves, the stable change of control oil pressure and flow rate is achieved, the neutral pressure loss of the entire multi-way valve is reduced, and the efficiency of the multi-way valve is improved. For the multi-way valve spool, spool shoulder, total oil inlet chamber, load feedback chamber, first oil outlet chamber, and second oil outlet chamber, an oil inlet throttling orifice is provided on the spool step located in the total oil inlet chamber. The coordination of multiple actuators is improved through the throttling orifice. However, a throttling device is not provided on its valve body for cooperation and to improve the static settlement ability of the tool.

[0005] To sum up, the existing technology obviously has inconveniences and defects in actual use, so it is necessary to improve. A throttling mechanism for a multi-way valve group is proposed to solve the above problems. Content of the Utility Model

[0006] Aiming at the above defects, the purpose of the utility model is to provide a throttling mechanism for a multi-way valve group, which improves the operation coordination, stability, and safety of the hydraulic system, enhances the static settlement performance of static tools, and provides a throttling mechanism for a multi-way valve group by optimizing the distribution of throttling grooves and bleeding grooves.

[0007] To achieve the above purpose, the utility model provides a throttling mechanism for a multi-way valve group, including a valve body, and a movable spool is arranged inside the valve body.

[0008] A plurality of annular grooves cooperating with the oil chambers inside the valve body are provided on the spool, and a plurality of grooves for regulating the oil in the valve body are annularly arranged along the circumferential direction on the spool inside the annular grooves.

[0009] A throttle mechanism for a multi-way valve group according to the present utility model, wherein a first sealing shoulder, a first protrusion, a second protrusion, a third protrusion, a fourth protrusion and a second sealing shoulder are sequentially arranged on the valve core. The annular groove includes a first groove, a second groove and a third groove. The first groove is arranged between the first protrusion and the second protrusion. The second groove is arranged between the second protrusion and the fourth protrusion. The third groove is arranged between the fourth protrusion and the second sealing shoulder.

[0010] A throttle mechanism for a multi-way valve group according to the present utility model, wherein the groove body includes a first drain groove and a first throttle groove arranged on both sides of the second protrusion, a second throttle groove and a third throttle groove arranged on the fourth protrusion, and a second drain groove arranged on one side of the second sealing shoulder.

[0011] A throttle mechanism for a multi-way valve group according to the present utility model, wherein a plurality of sealing rings are arranged between the valve core and the valve body.

[0012] A throttle mechanism for a multi-way valve group according to the present utility model, wherein the sealing rings are all sleeved on the second protrusion.

[0013] A throttle mechanism for a multi-way valve group according to the present utility model, wherein an arc-shaped shoulder is arranged between the fourth protrusion and the second sealing shoulder.

[0014] A throttle mechanism for a multi-way valve group according to the present utility model, wherein the shape of the groove body is selected from a rectangular groove type, a triangular groove type or a trapezoidal groove type.

[0015] A throttle mechanism for a multi-way valve group according to the present utility model, wherein a driving connection port is arranged on the valve core.

[0016] A throttle mechanism for a multi-way valve group according to the present utility model, wherein the driving connection port on the valve core is connected to a linear driving mechanism.

[0017] The present utility model provides a throttle mechanism for a multi-way valve group, and its beneficial effects are as follows:

[0018] 1. The height difference of the arc-shaped shoulder on the valve core is used to trigger and close the one-way valve that provides hydraulic pressure in the lift union. The arc-shaped shoulder and the drain grooves on both sides of the arc-shaped shoulder are used to provide a buffer space for the oil in the oil cavity to flow back.

[0019] 2. Symmetrical throttle grooves are arranged on the valve core to provide a buffer space for the oil to flow back when the valve core returns to the neutral position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a schematic cross-sectional structure diagram at the valve body;

[0022] Figure 3 It is a schematic structural diagram at the valve core.

[0023] In the figure, 1 - valve body, 1a - valve core, 10 - first sealing shoulder, 11 - first protrusion, 110 - first annular groove, 111 - second annular groove, 112 - third annular groove, 12 - second protrusion, 121 - first drain groove, 122 - first throttle groove, 123 - sealing ring, 13 - third protrusion, 14 - fourth protrusion, 141 - second throttle groove, 142 - third throttle groove, 15 - second sealing shoulder, 151 - second drain groove, 16 - arc-shaped shoulder, 152 - drive connection hole, 21 - oil chamber P, 22 - oil chamber A, 220 - oil chamber inlet A, 23 - oil chamber B, 230 - oil chamber inlet B, 3 - end cover, 41 - oil return port T, 42 - oil inlet port P, 5 - linear drive mechanism, 6 - check valve. Specific embodiments

[0024] In order to make the purpose, technical solutions and advantages of the present utility model more clear and understandable, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0026] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] See Figures 1 to 3, the utility model provides a throttling mechanism for a multi-way valve group, including a valve body 1, a valve core is arranged in the valve body 1, and a plurality of annular grooves cooperating with the oil cavities in the valve body 1 (the oil cavities include oil cavity A22, oil cavity B23 and oil cavity P21) are arranged on the valve core. A plurality of groove bodies for regulating the oil in the valve body 1 are circumferentially arranged on the valve core in the annular grooves. The valve core is successively provided with a first sealing shoulder 10, a first protrusion 11, a second protrusion 12, a third protrusion 13, a fourth protrusion 14 and a second sealing shoulder 15. The annular grooves include a first groove, a second groove and a third groove. The first groove is arranged between the first protrusion 11 and the second protrusion 12, the second groove is arranged between the second protrusion 12 and the fourth protrusion 14, and the third groove is arranged between the fourth protrusion 14 and the second sealing shoulder 15. By moving the valve core, the first annular groove 110 is communicated with the oil cavity B23 or the second annular groove 111 is communicated with the oil cavity A22.

[0028] Further, the groove bodies include a first drain groove 121 and a first throttle groove 122 arranged on both sides of the second protrusion 12, a second throttle groove 141 and a third throttle groove 142 arranged on the fourth protrusion 14, and a second drain groove 151 arranged on one side of the second sealing shoulder 15.

[0029] Among them, the third protrusion 13 is arranged in the third annular groove 122.

[0030] A check valve 6 cooperating with the arc-shaped shoulder 16 is arranged on the arc-shaped shoulder 16. An oil cavity A22 and an oil cavity B23 cooperating with the valve core are arranged in the valve body 1. An oil cavity P21 is arranged between the two cavities of the oil cavity A22 and the oil cavity B23. An oil cavity inlet A220 and an oil cavity inlet B230 are arranged between the oil cavity A22 and the oil cavity B23 and the valve body 1. The oil cavity inlet A220 and the oil cavity inlet B230 are respectively connected to both ends of the hydraulic mechanism of the tractor tool. The oil cavity P21 is connected to the oil inlet of the fuel tank, and is used to convey the oil in the valve body 1 to the oil cavity A22 and the oil cavity B23 through the oil cavity P21. When the valve core is in the neutral position (the third protrusion 13 on the valve core is directly below the oil cavity P21), the oil in the valve body 1 is in a static locking state. When the valve core moves as a whole in the direction close to the linear driving mechanism 5 (see Figure 2 for the valve core moving towards the right), the oil in the valve body 1 flows from the oil cavity P21 to the oil cavity A22. Under the action of the third throttle groove 142 and the second drain groove 151, the oil flow buffers the oil pressure flowing into the oil cavity A22.

[0031] See Figure 2 and Figure 3, preferably, a drive connection hole 152 is provided on one side of the spool valve, the drive connection hole 152 is connected to a linear drive mechanism 5, a detachable end cap 3 coaxial with the spool valve is provided on the valve body 1, and the other side of the spool valve can abut against the end cap 3 when moving, and the end cap 3 plays a role in limiting the spool valve.

[0032] Furthermore, a second drain groove 151 is circumferentially provided along the side of the second sealing shoulder 15 close to the arc-shaped shoulder 16, and the second drain groove 151 provides a buffer space for the oil chamber A22 during the pressure relief operation of the oil chamber A22.

[0033] See Figure 2 and Figure 3 , specifically, a check valve 6 and a valve stem passing through the check valve 6 are provided in the oil chamber A22 of the present utility model. The check valve 6 can be triggered by lifting the valve stem under the movement of the arc-shaped shoulder 16 or closed in the falling state. The check valve 6 is triggered by the relative position of the arc-shaped shoulder 16 in the oil chamber A22. When the larger diameter part of the arc-shaped shoulder 16 is directly below the check valve 6, the check valve 6 is triggered. When the smaller diameter part of the arc-shaped shoulder 16 (see Figure 2 ) is directly below the check valve 6, the check valve 6 is in the closed state.

[0034] See Figure 2 , specifically, a first drain groove 121 is circumferentially provided at one end of the second protrusion 12 away from the third protrusion 13, a first throttle groove 122 is circumferentially provided at the other end of the second protrusion 12, a second throttle groove 141 is circumferentially provided at one end of the fourth protrusion 14 close to the middle and close to the shoulder, and a third throttle groove 142 is circumferentially provided at the other end of the fourth protrusion 14.

[0035] Preferably, the first throttle groove 122 and the second throttle groove 141 are symmetrically arranged with respect to the third protrusion 13. The first throttle groove 122 and the second throttle groove 141 are respectively provided in one of the numbers 2, 4, or 6. The first throttle groove 122 and the second throttle groove 141 are provided on both sides of the third protrusion 13 to balance the oil pressure in the balance body, support the spool valve and reduce sliding friction, and avoid the problem of the spool valve being stuck.

[0036] Preferably, the shape of the groove body is selected from a rectangular groove type, a triangular groove type, or a trapezoidal groove type.

[0037] Furthermore, the first throttle groove 122, the second throttle groove 141, and the third throttle groove 142 are rectangular groove type throttle ports, so that the effect of linear displacement of the spool valve is good.

[0038] Further, the multi-way valve group includes several multi-way unions and a lifting union. A valve core is disposed through the valve body 1 of the lifting union. The multi-way unions and the lifting union are both connected with a linear driving mechanism 5. The linear driving mechanism 5 is used to displace the valve cores in the multi-way unions and the lifting union in the horizontal direction, so that the valve cores in the multi-way unions and the lifting union can cooperate with different cavities in the valve bodies 1 of the multi-way unions and the lifting union to adjust the flow state of the oil fluid.

[0039] The specific implementation process of the present utility model is as follows:

[0040] An oil return pipe and an oil inlet pipe are respectively connected to the oil return port T41 and the oil inlet port P42. The linear driving mechanism 5 is started to drive the multi-way valve rod to move in the multi-way valve body 1.

[0041] When the hydraulic mechanism performs the lifting work, the oil cavity P21 is communicated with the oil cavity A22 (the communication channel between the oil cavity P21 and the oil cavity A22 is not shown in the figure). The oil fluid enters the oil cavity A22 from the oil cavity P21. The third throttling groove 142 plays a throttling role. The oil fluid in the oil cavity P21 pushes the check valve 6 and makes the check valve 6 conduct, so that the hydraulic oil in the oil cavity P21 can pass through the oil cavity A22. At this time, the oil cavity B23 is communicated with the fuel tank. The oil fluid in the oil cavity B23 returns to the fuel tank under the action of the oil pressure. The first bleed groove 121 plays a bleeding role, and the lifting function of the implement on the tractor is completed.

[0042] When the hydraulic mechanism performs the lowering work, the oil cavity P21 is communicated with the oil cavity B23. The oil fluid is conducted from the oil cavity P21 to the oil cavity B23 through the valve core movement, and the ejector rod of the check valve 6 is pushed open after passing through the arc shoulder 16. At this time, the oil fluid returns to the oil cavity T through the oil cavity A22 (the oil cavity T is connected to the oil return port of the fuel tank. The oil inlet port and the oil return port of the fuel tank are respectively connected to the oil inlet port P42 and the oil return port T41. The fuel tank and the oil cavity T are not shown in the figure). At this time, the oil cavity A22, the check valve 6 and the second bleed groove 151 play a pressure relief role. The oil fluid flows from the oil cavity P21 to the oil cavity B23, and the lowering function of the implement on the tractor is completed.

[0043] When the hydraulic mechanism is in a static state, the channels between the oil cavity P21 and the oil cavity A22 and between the oil cavity P21 and the oil cavity B23 are not communicated. The valve core moves to the neutral position (that is, the third protrusion 13 is directly below the oil cavity P21). When the valve core returns to the neutral position, the first throttling groove 122 and the third throttling groove 142 play a throttling role, and the hydraulic mechanism is in a static locking state at this time.

[0044] Certainly, the present utility model may also have other various embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A throttling mechanism for a multi-way valve group, characterized in that, It includes a valve body, and a movable valve core is arranged inside the valve body; A number of annular grooves cooperating with the oil cavities inside the valve body are provided on the valve core, and a number of groove bodies for regulating the oil liquid inside the valve body are annularly arranged along the circumferential direction on the valve core in the annular grooves.

2. The throttling mechanism of a multi-way valve group according to claim 1, characterized in that, A first sealing shoulder, a first protrusion, a second protrusion, a third protrusion, a fourth protrusion and a second sealing shoulder are successively arranged on the valve core. The annular grooves include a first groove, a second groove and a third groove. The first groove is arranged between the first protrusion and the second protrusion, the second groove is arranged between the second protrusion and the fourth protrusion, and the third groove is arranged between the fourth protrusion and the second sealing shoulder.

3. The throttle mechanism of a multi-way valve group according to claim 2, characterized in that, The groove bodies include a first drain groove and a first throttle groove arranged on both sides of the second protrusion, a second throttle groove and a third throttle groove arranged on the fourth protrusion, and a second drain groove arranged on one side of the second sealing shoulder.

4. The throttle mechanism of a multi-way valve block according to claim 3, characterized in that, A number of sealing rings are arranged between the valve core and the valve body.

5. A throttling mechanism for a multi-way valve group according to claim 4, characterized in that, The sealing rings are all sleeved on the second protrusion.

6. The throttle mechanism of a multi-way valve block according to claim 2, characterized in that An arc-shaped shoulder is arranged between the fourth protrusion and the second sealing shoulder.

7. The throttling mechanism of a multi-way valve block according to claim 1, characterized in that, The shape of the groove body is selected from a rectangular groove type, a triangular groove type or a trapezoidal groove type.

8. The throttle mechanism of a multi-way valve block according to claim 1, characterized in that A drive connection port is arranged on the valve core.

9. The throttling mechanism of a multi-way valve block according to claim 8, characterized in that, The drive connection port on the valve core is connected to a linear drive mechanism.

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