CN205154794U - Overflow valve with pressure regulating and security function - Google Patents

Abstract

The utility model discloses an overflow valve with pressure regulating and safety functions, which relates to the technical field of hydraulic control valves. It includes a valve body, a main valve, a pilot valve and an emergency pin. The valve body has a flow channel, a drainage hole, a liquid inlet, a liquid outlet I and a liquid outlet II; one side of the main valve is connected to the liquid inlet , one side is connected to the pilot valve through the flow channel, the lower end is connected to the liquid outlet I, and the upper end is connected to the liquid outlet II through the drainage hole; the emergency pin is connected to the drainage hole. Effectively avoid the problem of resonance caused by the traditional double overflow valve; increase the stability of the main valve core; facilitate the centering of the main valve core and prevent the valve core from being stuck; the safety valve core uses the hydraulic pressure at both ends to achieve balance , the safety valve core can quickly open and release pressure; when the system is in an emergency, the safety pin can be rotated to open one end of the pressure limiting valve core and release pressure to ensure the safety and stability of the system pressure.

Description

An overflow valve with pressure regulating and safety functions

technical field

The utility model relates to the technical field of hydraulic control valves, in particular to an overflow valve with pressure regulating and safety functions.

Background technique

With the continuous development of industrial technology, the hydraulic system that drives the actuators of construction machinery tends to be high-pressure and high-flow, which puts forward higher requirements for the pressure control and flow control of the hydraulic system.

In a practical hydraulic system, the relief valve is one of the most important pressure control components in the hydraulic transmission system. Its basic working principle is that when the system pressure reaches or exceeds the set pressure of the relief valve, the valve port opens to allow The liquid overflows, so that the outlet pressure of the system drops to the pressure specified by the overflow valve. In the quantitative pump hydraulic system, the overflow valve mainly plays the role of shunting speed regulation and stabilizing the system pressure; in the variable pump hydraulic system, the overflow valve controls the maximum pressure of the system and plays a role of safety protection. In almost all practical hydraulic systems, relief valves are installed at the outlet of hydraulic pumps. It can be seen that relief valves are one of the essential components in hydraulic systems.

Due to factors such as load fluctuations, flow pulsations of hydraulic pumps, and reversing valves, there are large fluctuations in the pressure of the hydraulic system. Nowadays, double relief valves are often used in hydraulic systems, one for stabilizing the system pressure, that is, Pressure regulation and pressure regulation, one is used to control the maximum pressure of the system. As in a hydraulic system, due to the closeness between the adjusted pressure and the maximum pressure, the double relief valve is prone to resonance, which will cause the system to work abnormally and even damage the hydraulic components. If the double relief valve is arranged far away, resonance can be avoided, but the structural size of the hydraulic system will become larger, which will increase the difficulty of piping layout or valve block design.

Utility model content

Aiming at the deficiencies of the prior art, the utility model discloses a relief valve with pressure regulating and safety functions, which can solve the problem of resonance caused by the design of double relief valves or the problem of enlarged structural size of the hydraulic system.

In order to achieve the above object, the utility model is realized through the following technical solutions:

A relief valve with pressure regulating and safety functions, including a valve body, a main valve, a pilot valve and an emergency pin, the valve body has a flow channel, a drainage hole, a liquid inlet, a liquid outlet I and a liquid outlet II; one side of the main valve is connected to the liquid inlet, one side is connected to the pilot valve through the flow channel, the lower end is connected to the liquid outlet I, and the upper end is connected to the liquid outlet II through the drainage hole; the emergency pin is connected to the drainage hole connect.

Preferably, the main valve includes a main spring and a main valve core, the main spring is arranged around the main valve core, one end is connected to the valve body and the other end is connected to the main valve core.

Preferably, the main valve core has a damping hole I, a circumferential hole I, a central hole, a circumferential hole II and a circumferential hole III, and the damping hole I is arranged on the flanges on both sides of the main valve core. The center line is symmetrical; the circumferential hole I is set on the side wall of the cylinder in the middle of the main valve core, and is distributed in a ring; the said circumferential hole III is set on the upper end of the extension rod at the tail of the main valve core; the said circumferential hole II is set on the circumferential hole I and the circumferential Between the holes III; the central hole is set inside the extension rod at the tail of the main valve core, connecting the peripheral hole I, the peripheral hole II and the peripheral hole III.

Preferably, the pilot valve includes a pilot spring, an adjusting bolt and a pilot spool, and the adjusting bolt is connected to the pilot spool through the pilot spring.

Preferably, the emergency pin is provided with notches.

Preferably, a safety valve and a liquid outlet III are also included, one side of the safety valve communicates with the drainage hole, the other side communicates with the liquid outlet III, and the head communicates with the liquid inlet.

Preferably, the safety valve includes a safety adjusting bolt, a safety spring, a safety valve core and a damping hole II, and the safety adjusting bolt is connected to the safety valve core through a safety spring; the damping hole II is set on the safety valve core Inside.

Preferably, the liquid inlet includes a first liquid inlet and a second liquid inlet.

The utility model discloses an overflow valve with pressure regulating and safety functions, which establishes a coordination mechanism between the two functions of pressure regulating and pressure limiting. Compared with the combined use of traditional double overflow valves, it has five advantages: 1. The spool spring of safety pressure limiting is relatively soft, and the spool spring of overflow and pressure regulating function is relatively hard, which effectively avoids the technical problem of resonance caused by the close control pressure of traditional double relief valves; the second is the main valve with overflow and pressure regulating function The spool is multi-stage concentric, and the extension rod on the main spool is similar to the tail vertebra, which increases the stability of the main spool; the third is that when the pressure is adjusted by the main spool, there is a ring on the extension rod of the main spool. The arrangement of circumferential holes is beneficial to the centering of the main valve core and prevents the valve core from being clamped; the fourth is that the safety valve core uses the hydraulic pressure at both ends to achieve balance. Once the pressure is released at one end, the safety valve core can be quickly opened and released; When an emergency occurs in the system, the safety pin can be rotated to open one end of the pressure limiting spool and release the pressure, and overflow again on the original basis to ensure the safety and stability of the system pressure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the sectional structure schematic diagram of the utility model embodiment 1;

Fig. 2 is the sectional structure schematic diagram of the utility model embodiment 2;

Fig. 3 is the sectional structure schematic diagram of the utility model embodiment 3;

Fig. 4 is the sectional structure schematic diagram of main valve core in the utility model;

Fig. 5 is the three-dimensional structure schematic diagram of main valve core in the utility model;

Fig. 6 is a schematic diagram of the three-dimensional structure of the emergency pin in the utility model.

In the figure 1. valve body, 2. main spring, 3. main spool, 4. flow channel, 5. pilot spring, 6. adjusting bolt, 7. pilot spool, 8. emergency pin, 9. drainage hole, 10 , safety adjusting bolt, 11, safety spring, 12, safety valve core, 13, damping hole Ⅱ, 81, notch, a, damping hole Ⅰ, b, circumferential hole Ⅰ, c, center hole, d, circumferential hole Ⅱ, e. Circumferential hole III, P, liquid inlet, P ₁ , first liquid inlet, P ₂ , second liquid inlet, T ₁ , liquid outlet I, T ₂ , liquid outlet II, T ₃ , outlet Fluid port III.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

As shown in Fig. 1, Fig. 4, Fig. 5 and Fig. 6, a relief valve with pressure regulating and safety functions described in the embodiment of the utility model can be divided into three parts: a pressure stabilizing process, a safety process and an emergency process. a working process.

Pressure stabilization process: The fluid enters the main valve cavity from the liquid inlet P, enters the flow channel 4 on the upper side of the main valve core 3 through the damping hole Ia, and acts on the pilot valve core 7, and at the same time, the fluid flows into the center hole through the peripheral hole Ib In c, the drainage hole 9 acts on the emergency pin 8, at this time the notch 81 on the emergency pin 8 is closed, and the drainage hole 9 is not connected to the liquid outlet IIT ₂ . When the fluid pressure on the upper side of the main spool 3 is lower than the opening pressure of the pilot valve, the pilot spool 7 is closed, the inlet pressure is equal to the fluid pressure on the upper side of the main spool 3, and the main spool 3 closes the liquid outlet IT under the action of the main spring 2 ₁ ; When the fluid pressure on the upper side of the main valve core is greater than the opening pressure of the pilot valve but lower than the safety pressure, the pilot valve core 7 opens, the fluid in the flow channel 4 flows into the liquid outlet IIT ₂ through the pilot valve core 7, and the fluid on the upper side of the main valve core 3 The pressure decreases, forming a pressure difference with the inlet pressure, and the main valve core 3 will overcome the spring force to open under the action of the pressure difference, and the fluid will flow out from the liquid outlet IT ₁ to realize pressure regulation. At this time, the circumferential hole IIIe at the upper end of the extension rod at the tail of the main valve core 3 is not connected with the liquid outlet IIT ₂ . At this stage, no matter how the inlet pressure fluctuates, the main spool 3 can adjust the opening of the valve port through the pressure difference, thereby maintaining the stability of the outlet pressure.

Safety process: when the inlet pressure is greater than the safety pressure, the opening of the main valve core 3 is relatively large at this time, and the circumferential hole IIIe at the upper end of the extension rod at the tail of the main valve core 3 is connected to the liquid outlet IIT ₂ , and the fluid on the upper side of the main valve core 3 It will pass through the peripheral hole Ib and the central hole c and enter the liquid outlet IIT ₂ along the peripheral hole IIIe to be discharged. In this way, the fluid pressure on the upper side of the main spool 3 will decrease rapidly, and the pressure difference between the upper and lower sides of the main spool 3 will increase rapidly, so that the opening of the main spool 3 will be quickly opened to the maximum, and the fluid velocity at the liquid outlet IT ₁ will be increased. Spill quickly to achieve the function of safety protection.

Emergency process: When the system inlet pressure is too high or the peripheral hole Ⅲe at the upper end of the extension rod at the end of the main valve core 3 fails to work normally, rotate the emergency pin 8 and use the notch 81 to connect the drainage hole 9 with the liquid outlet ⅡT ₂ , so that the main valve core 3 The upper side fluid enters the liquid port IIT through the center hole c and the peripheral hole IId through the drainage hole 9, and ₂ flows out. As a result, the pressure difference on both sides of the main valve core 3 increases, the main valve core 3 opens, and the fluid flows out from the liquid outlet IT ₁ . It prevents the phenomenon that the system pressure continues to rise when the peripheral hole IIIe cannot work normally due to blockage or other reasons, thereby better protecting the safety and stability of the system fluid pressure.

Example 2

As shown in Figure 2, Figure 4, Figure 5 and Figure 6, a relief valve with pressure regulation and safety functions described in the embodiment of the utility model has a working process similar to that of embodiment 1, and the valve body 1 is added A safety valve is provided, and the safety valve core 12 is provided with a damping hole II13. In the safety process, compared with the first solution, the safety valve core 12 in the second solution will be opened, so that the fluid flows out from the liquid outlet IIIT ₃ , which increases the overflow volume and has reliable safety protection performance.

Example 3

As shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a relief valve with pressure regulation and safety functions described in the embodiment of the utility model has a working process similar to that of embodiment 1, and can be limited to two ways of execution The working state of the component. When the executive element controlled by port P _works normally, the executive element controlled by port P1 also works normally. When the system pressure controlled by port P exceeds the safety pressure, the spool 3 moves up to release the two control pressures at the same time.

To sum up, the utility model discloses a relief valve with pressure regulation and safety functions, which establishes a coordination mechanism between the two functions of pressure regulation and pressure limitation. Compared with the combination of traditional double relief valves, there are five One advantage: first, the spool spring of the safety limiting pressure is relatively soft, and the spool spring of the overflow and pressure regulating function is relatively hard, which effectively avoids the technical problem of resonance caused by the close control pressure of the traditional double relief valve; the second is the overflow and pressure regulation The main spool of the function is multi-stage concentric, and the extension rod on the main spool is similar to the tail vertebra, which increases the stability of the main spool; the third is that when the main spool is adjusted, the extension rod of the main spool There are circumferential holes arranged in a ring, which is conducive to the centering of the main valve core and prevents the valve core from being clamped; fourth, the safety valve core uses the hydraulic pressure at both ends to achieve balance. Once one end is released, the safety valve core can be quickly opened and released. Fifth, when an emergency occurs in the system, the safety pin can be rotated to open one end of the pressure limiting valve core and release the pressure, and overflow again on the original basis to ensure the safety and stability of the system pressure.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. any such actual relationship or order exists between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be applied to the foregoing implementations. Modifications to the technical solutions described in the examples, or equivalent replacement of some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (8)

1. A relief valve with pressure regulating and safety functions, comprising a valve body, a main valve, a pilot valve and an emergency pin, characterized in that: the valve body has a flow channel, a drainage hole, a liquid inlet, a liquid outlet port I and liquid outlet II; one side of the main valve is connected to the liquid inlet, one side is connected to the pilot valve through a flow channel, the lower end is connected to the liquid outlet I, and the upper end is connected to the liquid outlet II through the drainage hole; the said The emergency pin is connected to the drainage hole. 2. The relief valve with pressure regulating and safety functions as claimed in claim 1, characterized in that: said main valve comprises a main spring and a main valve core, said main spring is arranged around the main valve core, One end is connected with the valve body and the other end is connected with the main valve core. 3. The relief valve with pressure regulating and safety functions as claimed in claim 2, characterized in that: the main valve core has a damping hole I, a peripheral hole I, a central hole, a peripheral hole II and a peripheral hole III, The damping hole I is set on the flanges on both sides of the main valve core, which is symmetrical about the center line of the main valve core; the circumferential hole I is set on the side wall of the cylinder in the middle of the main valve core, and is distributed in a ring; the circumferential hole III is set At the upper end of the extension rod at the tail of the main valve core; the peripheral hole II is set between the peripheral hole I and the peripheral hole III; Hole III. 4. The overflow valve with pressure regulating and safety functions as claimed in claim 1, characterized in that: said pilot valve comprises a pilot spring, an adjusting bolt and a pilot spool, and said adjusting bolt passes through the pilot spring and the pilot Spool connection. 5. The relief valve with pressure regulating and safety functions as claimed in claim 1, characterized in that: said emergency pin is provided with a notch. 6. The overflow valve with pressure regulating and safety functions as claimed in claim 1, characterized in that it also includes a safety valve and a liquid outlet III, one side of the safety valve communicates with the drainage hole, and the other side communicates with the drainage hole. The liquid outlet III is connected, and the head is connected with the liquid inlet. 7. The overflow valve with pressure regulating and safety functions as claimed in claim 6, characterized in that: said safety valve includes a safety adjustment bolt, safety spring, safety valve core and damping hole II, said safety adjustment The bolt is connected with the safety valve core through a safety spring; the damping hole II is set in the safety valve core. 8. The overflow valve with pressure regulating and safety functions as claimed in claim 6, wherein said liquid inlet includes a first liquid inlet and a second liquid inlet.