阅读说明：本技术 一种新型减压溢流阀 (Novel pressure reducing overflow valve ) 是由 李志周 于 2019-10-30 设计创作，主要内容包括：本发明创造提供了一种新型减压溢流阀,包括先导阀阀体、主阀体、阀座；先导阀阀体设置在主阀体的上表面,阀座设置在主阀体的下表面；主阀体包括先导油通道、油口、主阀体阀芯部、卸油通道,油口分为油口一、油口二,主阀体阀芯部包括外壁、主阀芯、弹簧；本发明创造所述的减压溢流阀具备溢流保护功能,当减压溢流阀控制的液压回路中,由于外力原因,产生超过减压溢流阀设定的压力时,减压溢流阀快速做出响应,将超过设定值的压力泄走,保持压力稳定。(The invention provides a novel pressure-reducing overflow valve, which comprises a pilot valve body, a main valve body and a valve seat, wherein the pilot valve body is provided with a valve seat; the pilot valve body is arranged on the upper surface of the main valve body, and the valve seat is arranged on the lower surface of the main valve body; the main valve body comprises a pilot oil channel, an oil port, a main valve body valve core part and an oil discharge channel, wherein the oil port is divided into a first oil port and a second oil port; the pressure-reducing overflow valve has an overflow protection function, and when the pressure in a hydraulic circuit controlled by the pressure-reducing overflow valve exceeds the set pressure of the pressure-reducing overflow valve due to external force, the pressure-reducing overflow valve responds quickly to release the pressure exceeding the set value, so that the pressure is kept stable.)

1. The utility model provides a novel decompression overflow valve which characterized in that: comprises a pilot valve body, a main valve body and a valve seat;

the pilot valve body is arranged on the upper surface of the main valve body, and the valve seat is arranged on the lower surface of the main valve body;

the main valve body comprises a pilot oil channel, an oil port, a main valve body valve core part and an oil discharge channel, wherein the oil port is divided into a first oil port, a second oil port and a third oil port;

an oil delivery channel is arranged in a pilot valve body, a spherical non-return device is arranged at the joint of the oil delivery channel and the pilot oil channel, a pilot valve spherical valve core is arranged in the oil delivery channel and is far away from one side of the pilot oil channel, a spring is arranged on the other side of the pilot valve spherical valve core, the spring is arranged in a pilot valve spring cavity, the spring applies thrust to the spherical valve core, and three through holes, namely a fifth through hole, a sixth through hole and a seventh through hole, are arranged on the wall of the pilot valve;

the main valve core is close to the baffle ring, the oil port two-way is communicated with the oil port one through a through hole three, a through hole one and a corresponding through hole on the main valve core, the oil port one is communicated with the pilot oil channel, the through hole two and the through hole four are positioned above the corresponding hole on the main valve core, the through hole two and the through hole four are communicated with the oil port three, the through hole five is communicated with the pilot oil channel and the oil delivery channel, the through hole six is communicated with the oil delivery channel and the main valve body spring cavity, and the through hole seven is communicated with the pilot valve spring cavity and the.

2. The novel pressure reducing overflow valve of claim 1, characterized in that: the pilot valve body further comprises a damping hole: the damping hole has two, and one sets up spherical non return ware and is close to pilot valve spherical case one side in the oil transportation passageway, and main valve body spring chamber and pilot valve spherical case of UNICOM, another sets up in the through-hole six.

3. The novel pressure reducing overflow valve of claim 1, characterized in that: the main valve body further comprises a plug screw and an orifice, the orifice is arranged at the position where the first oil port is communicated with the pilot oil channel, and the plug screw is arranged on one side, far away from the first oil port, of the orifice.

4. The novel pressure reducing overflow valve of claim 1, characterized in that: the valve seat comprises four oil ports which are respectively communicated with the main valve seat, the first oil port, the second oil port, the third oil port and the oil discharge channel, and the valve seat is also provided with a fixing hole connected with other devices.

5. The novel pressure reducing overflow valve of claim 1, characterized in that: the pilot valve body further comprises a locking nut and an adjusting handle, the adjusting handle can change the position of the spring cavity of the pilot valve, and the locking nut fixes the position.

Technical Field

The invention belongs to the field of mechanical elements, and particularly relates to a novel pressure reduction overflow valve.

Background

In modern industrial production, hydraulic equipment is more and more, and the control of many mechanical equipment is not separated from a hydraulic control system, so that a stable and reliable hydraulic system is a necessary condition for normal operation and control of the equipment.

In many large hydraulic systems, the hydraulic station often provides only a fixed system pressure, but because of the many devices controlled by the hydraulic system, many actuators require a lower pressure than the fixed system pressure provided by the hydraulic station, and the system pressure needs to be reduced to the appropriate pressure required by the actuators. Many hydraulic equipment are in the actual work in-process, because the reason of special operating mode, often still need carry out safety protection to the hydraulic circuit after the decompression, for example when actuating mechanism receives the exogenic action, when initiating pipeline internal pressure and rise, just need an overflow valve to overflow to guarantee the stability of this pipeline internal pressure. Many hydraulic systems requiring pressure reduction and overflow protection often use a pressure reducing valve and an overflow valve to satisfy the working condition, but because the two valves need to be adjusted separately, there is often a large error, for example, the pressure reducing valve reduces the pressure to 5 mpa, and at this time, when the overflow valve is adjusted, the protection pressure is often above 5.5 mpa, so that the result is that the overflow protection is started after the pressure exceeds 5.5 mpa set by the overflow valve, and the pressure fluctuation range is often large.

Disclosure of Invention

In view of the above, the present invention provides a novel pressure relief valve to simplify the components of the valve body and improve the sensitivity.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a novel pressure-reducing overflow valve comprises a pilot valve body, a main valve body and a valve seat;

the pilot valve body is arranged on the upper surface of the main valve body, and the valve seat is arranged on the lower surface of the main valve body;

the main valve body comprises a pilot oil channel, an oil port, a main valve body valve core part and an oil discharge channel, wherein the oil port is divided into a first oil port, a second oil port and a third oil port;

an oil delivery channel is arranged in a pilot valve body, a spherical non-return device is arranged at the joint of the oil delivery channel and the pilot oil channel, a pilot valve spherical valve core is arranged in the oil delivery channel and is far away from one side of the pilot oil channel, a spring is arranged on the other side of the pilot valve spherical valve core, the spring is arranged in a pilot valve spring cavity, the spring applies thrust to the spherical valve core, and three through holes, namely a fifth through hole, a sixth through hole and a seventh through hole, are arranged on the wall of the pilot valve;

the main valve core is close to the baffle ring, the oil port two-way is communicated with the oil port one through a through hole three and a corresponding through hole on the main valve core, the through hole two and the through hole four are positioned above the corresponding hole of the main valve core, the through hole one, the through hole two and the through hole four are communicated with the oil port three, the through hole five is communicated with the pilot oil channel and the oil delivery channel, the through hole six is communicated with the oil delivery channel and the main valve body spring cavity, and the through hole seven is communicated with the pilot valve spring cavity and the oil unloading channel.

Further, the pilot valve body still includes the damping hole: the spherical non-return device is arranged in the oil delivery channel and close to one side of the spherical valve core of the pilot valve, one damping hole is communicated with the spring cavity of the main valve body and the spherical valve core of the pilot valve, and the other damping hole is arranged in the sixth through hole;

furthermore, the main valve body further comprises a plug screw and an orifice, the orifice is arranged at the position where the first oil port is communicated with the pilot oil channel, and the plug screw is arranged on one side, far away from the first oil port, of the orifice.

Further, the valve seat comprises four oil ports which are respectively communicated with the main valve seat, the first oil port, the second oil port, the third oil port and the oil unloading channel, and a fixing hole connected with other devices is further formed in the valve seat.

Furthermore, the pilot valve body further comprises a locking nut and an adjusting handle, the adjusting handle can change the position of the spring cavity of the pilot valve, and the locking nut fixes the position.

Compared with the prior art, the invention has the following advantages:

1. the pressure-reducing overflow valve has a pressure-reducing function, and an individual hydraulic control loop is required to be reduced in the existing hydraulic system so as to meet the requirement of an actuating element on pressure.

2. The pressure reducing overflow valve has an overflow protection function, and when pressure exceeding the set pressure of the pressure reducing overflow valve is generated in a hydraulic circuit controlled by the pressure reducing overflow valve due to external force, the pressure reducing overflow valve quickly responds to release the pressure exceeding the set value, so that the pressure is kept stable.

3. In the design of an original hydraulic control loop, a pressure reducing valve and an overflow valve are generally combined to form a pressure reducing overflow function in a loop requiring the pressure reducing function and the overflow function, the design has the defects of more valve pieces, more complex designed oil path block, high cost and larger pressure fluctuation, and the pressure reducing overflow valve of the invention has the advantages of small pressure fluctuation, more sensitive reaction, simple design of the oil path block and lower cost because the same pilot part is used.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

fig. 1 is a top view of the overall structure according to the inventive embodiment.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a cross-sectional view taken along line Z-Z of fig. 1.

Description of reference numerals:

1. a plug screw; 2. an orifice; 3. a pilot oil passage; 4. a main valve element; 5. a main spool spring cavity; 6. a spherical backstop; 7. a first damping hole; 8. a pilot valve body; 9. a second damping hole; 10. a spherical valve core of the pilot valve; 11. a pilot valve spring cavity; 12. locking the nut; 13. an adjusting handle; 14. a main valve body; 15. a main spool spring; 16. an oil discharge channel; 17. a first oil port; 18. a second oil port; 19. a third oil port; 20. an oil delivery passage; 21. a first through hole; 22. a second through hole; 23. a third through hole; 24. a fourth through hole; 25. a fifth through hole; 26. a sixth through hole; 27. a seventh through hole; 28. a valve seat.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

As shown in fig. 1, 2 and 3, the novel pressure reducing overflow valve comprises a pilot valve body 8, a main valve body 14 and a valve seat 28;

the pilot valve body 8 is arranged on the upper surface of the main valve body 14, and the valve seat 28 is arranged on the lower surface of the main valve body 14;

the main valve body 14 comprises a pilot oil channel 3, an oil port, a valve core part of the main valve body 14 and an oil discharge channel 16, wherein the oil port is divided into a first oil port 17, a second oil port 18 and a third oil port 19, the valve core part of the main valve body 14 comprises an outer wall, a main valve core 4 and a spring, the outer wall is of a hollow cylindrical structure, a baffle ring is arranged at the lower end of the inner end face of the outer wall, four through holes are respectively a first through hole 21, a second through hole 22, a third through hole 23 and a fourth through hole 24 on the circumferential end face, the first through hole 21 and the third through hole 23 are communicated with the second oil port 18, the second through hole 22 and the fourth through hole 24 are communicated with the third oil port 19, the main valve core 4 is of a hollow cylindrical structure, a baffle plate is arranged at the position close to the top end, the four;

an oil delivery channel 20 is arranged in the pilot valve body 8, the spherical non-return device 6 is arranged at the joint of the oil delivery channel 20 and the pilot oil channel 3, the pilot valve spherical valve core 10 is arranged in the oil delivery channel 20 and is far away from one side of the pilot oil channel 3, a spring is arranged on the other side of the pilot valve spherical valve core 10 and is arranged in a pilot valve spring cavity 11, the spring applies thrust to the spherical valve core, and three through holes, namely a through hole five 25, a through hole six 26 and a through hole seven 27, are arranged on the wall of the pilot valve;

the main valve core 4 is close to the baffle ring, the oil port II 18 is communicated with the oil port I17 through a through hole III 23, a through hole I21 and a corresponding through hole on the main valve core 4, the oil port I17 is communicated with the pilot oil channel 3, the through hole II 22 and the through hole IV 24 are positioned above the corresponding hole on the main valve core 4, the through hole II 22 and the through hole IV 24 are communicated with the oil port III 19, the through hole V25 is communicated with the pilot oil channel 3 and the oil delivery channel 20, the through hole VI 26 is communicated with the oil delivery channel 20 and the main valve body 14 spring cavity, and the through hole VII 27 is communicated with the pilot valve spring cavity 11 and the oil discharge.

The pilot valve body 8 further comprises a damping hole: two damping holes are provided, one damping hole is arranged at one side, close to the pilot valve spherical valve core 10, of the spherical backstop 6 in the oil delivery channel 20 and is communicated with the spring cavity of the main valve body 14 and the pilot valve spherical valve core 10, and the other damping hole is arranged in a through hole six 26;

the main valve body 14 further comprises a plug screw 1 and an orifice 2, the orifice 2 is arranged at the position where the first oil port 17 is communicated with the pilot oil channel 3, and the plug screw 1 is arranged on one side, far away from the first oil port 17, of the orifice 2.

The valve seat 28 comprises four oil ports which are respectively communicated with the main valve seat 28, the first oil port 17, the second oil port 18, the third oil port 19 and the oil discharge channel 16, and a fixing hole connected with other devices is further formed in the valve seat 28.

The pilot valve body 8 further comprises a locking nut 12 and an adjusting handle 13, the adjusting handle 13 can change the position of the pilot valve spring cavity 11, and the locking nut 12 fixes the position.

And (3) a pressure reduction function: when the first oil port 17 has no pressure, the main valve core 4 is completely lowered to the lowest point under the action of the main valve core spring 15, at this time, the first oil port 17 and the second oil port 18 are communicated with each other, and high-pressure hydraulic oil can freely flow from the second oil port 18 to the first oil port 17. When the hydraulic oil flows from the second oil port 18 to the first oil port 17, the high-pressure oil acts on the pilot valve ball valve core 10 through the throttle hole 2, the pilot oil passage 3 and the first orifice 7, flows into the spring chamber 5 of the main valve core through the second orifice 9, and exerts a downward force on the main valve core 4 together with the spring. When the pressure of the first oil port 17 continues to rise and reaches the pressure set by the pilot valve 13, the spherical valve core 10 of the pilot valve is opened, a pressure difference is formed between the upper part and the lower part of the main valve core at the moment, the main valve core moves upwards under the pushing of the pressure difference, hydraulic oil in the main valve spring cavity 5 enters the spring cavity 11 of the pilot valve through the second damping hole 9 and returns to the oil tank through the channel 15 without pressure, and due to the upward movement of the main valve core 4, the opening of the second oil port 18 leading to the first oil port 17 is gradually reduced until the pressure is balanced, so that the pressure is reduced to maintain the pressure of the first oil port 17.

And (4) an overflow function: when the pressure of the first oil port 17 reaches the set pressure, the system is in a stable state, when the pressure of the first oil port 17 suddenly rises due to external force and is greater than the set pressure, the main valve core 4 is pushed by pressure oil, the main valve core continues to move upwards, at the moment, the opening of the second oil port 18 leading to the first oil port 17 is completely closed, oil liquid in the two cavities is in an isolated state, the first oil port 17 leading to the oil discharge channel 16 is opened due to the upward movement of the valve core, and therefore the pressure oil exceeding the set value is discharged to the oil discharge channel 16, and the effect of overflow pressure stabilization is achieved. When the pressure of the first oil port 17 is reduced to be lower than the set pressure, the main valve core moves downwards under the action of pressure difference, the first oil port 17 is closed to be communicated with the oil unloading channel 16, the second oil port 18 is opened to be communicated with the channel of the first oil port 17, so that the pressure of the first oil port 17 is recovered to a set value, and the main valve core performs different up-and-down reciprocating motions under different working conditions to achieve the double functions of pressure reduction and overflow.

The screw plug 1 is connected with a pilot oil channel 3; the ball check 6 can prevent the hydraulic oil from flowing back; the position of the spring cavity of the pilot valve can be adjusted by the adjusting handle 13, the contact area between the pressure of the spring and the through hole seven 27 and the spring cavity is changed, and the position can be fixed by tightening the lock nut 12; the pilot valve spring chamber 11 is used to house a spring.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.