阅读说明：本技术 一种组合式阀芯结构以及比例减压阀 (Combined valve core structure and proportional pressure reducing valve ) 是由 张策 翁之旦 陈志勇 陈飞飞 于 2021-06-23 设计创作，主要内容包括：本发明提供了一种组合式阀芯结构,属于减压阀技术领域,包括：外阀芯,其沿轴向开设有第一阀孔,所述第一阀孔包括沿轴向依次连通的第一阀腔、第二阀腔、第三阀腔、第四阀腔、第五阀腔、第六阀腔以及第七阀腔；内阀芯,其可移动的设置在所述第一阀孔内。还提供了一种比例减压阀,包括组合式阀芯结构,还包括：阀体,其设置有第二阀孔,所述外阀芯可移动的设置在所述第二阀孔内,所述第二阀孔包括沿轴向依次连通的第八阀腔、回油腔、工作腔、进油腔以及第九阀腔。本发明的有益效果为：其通过组合式阀芯实现了先导阀控制的效果,其结构非常的紧凑巧妙,并且动作反应灵敏,能够在减压时实现伺服随动性的效果。(The invention provides a combined valve core structure, which belongs to the technical field of pressure reducing valves and comprises: the outer valve core is provided with a first valve hole along the axial direction, and the first valve hole comprises a first valve cavity, a second valve cavity, a third valve cavity, a fourth valve cavity, a fifth valve cavity, a sixth valve cavity and a seventh valve cavity which are sequentially communicated along the axial direction; an inner spool movably disposed within the first valve bore. Still provide a proportional pressure reducing valve, including combination formula case structure, still include: the valve body is provided with a second valve hole, the outer valve core is movably arranged in the second valve hole, and the second valve hole comprises an eighth valve cavity, an oil return cavity, a working cavity, an oil inlet cavity and a ninth valve cavity which are sequentially communicated along the axial direction. The invention has the beneficial effects that: the pilot valve control effect is realized through the combined valve core, the structure is very compact and ingenious, the action response is sensitive, and the servo following effect can be realized during pressure reduction.)

1. A modular valve cartridge structure, comprising:

the outer valve core is provided with a first valve hole along the axial direction, and the first valve hole comprises a first valve cavity, a second valve cavity, a third valve cavity, a fourth valve cavity, a fifth valve cavity, a sixth valve cavity and a seventh valve cavity which are sequentially communicated along the axial direction;

the inner valve core is movably arranged in the first valve hole, and two ends of the inner valve core are respectively positioned in the first valve cavity and the seventh valve cavity;

the peripheral surface of the inner valve core is sequentially provided with a first plugging part, a first annular groove, a second plugging part, a second annular groove, a third plugging part, a third annular groove and a fourth plugging part along the axial direction;

the first blocking part is blocked between the first valve cavity and the second valve cavity, the second valve cavity is communicated with the third valve cavity through the first annular groove, the second blocking part is blocked between the third valve cavity and the fourth valve cavity, the fourth valve cavity can be communicated with the fifth valve cavity through the second annular groove, the third blocking part can be blocked between the fourth valve cavity and the fifth valve cavity or can be blocked between the fifth valve cavity and the sixth valve cavity, the fifth valve cavity can be communicated with the sixth valve cavity through the third annular groove, and the fourth blocking part is blocked between the sixth valve cavity and the seventh valve cavity;

the inner valve core is provided with a first connecting hole and a second connecting hole, the first valve cavity is communicated with the third valve cavity through the first connecting hole, and the seventh valve cavity is communicated with the fifth valve cavity through the second connecting hole.

2. A modular valve cartridge structure according to claim 1, wherein: and a fifth plugging part, a fourth annular groove and a sixth plugging part are sequentially arranged on the circumferential surface of the outer valve core along the axial direction.

3. A modular valve cartridge structure according to claim 2, wherein: the outer valve core is provided with a third connecting hole, one end of the third connecting hole is located in the fifth blocking portion, and the other end of the third connecting hole is communicated with the second valve cavity.

4. A modular valve cartridge structure according to claim 3, wherein: and the outer valve core is also provided with a fourth connecting hole, one end of the fourth connecting hole is positioned at the sixth plugging part, and the other end of the fourth connecting hole is communicated with the fourth valve cavity.

5. A modular valve cartridge structure according to claim 4, wherein: the outer valve core is further provided with a fifth connecting hole, one end of the fifth connecting hole is communicated with the sixth valve cavity, and the other end of the fifth connecting hole is communicated with the third connecting hole.

6. A modular valve cartridge structure according to claim 5, wherein: and a first spring is arranged in the first valve cavity, a second spring is arranged in the seventh valve cavity, and the first spring and the second spring are respectively connected with two ends of the inner valve core in an abutting mode.

7. A proportional pressure reducing valve including the combination valve cartridge structure of any one of claims 1 to 6, further comprising:

the valve body is provided with a second valve hole, the outer valve core is movably arranged in the second valve hole, and the second valve hole comprises an eighth valve cavity, an oil return cavity, a working cavity, an oil inlet cavity and a ninth valve cavity which are sequentially communicated along the axial direction;

the fifth plugging portion is plugged between the eighth valve cavity and the oil return cavity, the sixth plugging portion is plugged between the ninth valve cavity and the oil inlet cavity, the oil return cavity can be communicated with the working cavity through the fourth annular groove, the working cavity can be communicated with the oil inlet cavity through the fourth annular groove, the fifth plugging portion can be plugged between the oil return cavity and the working cavity, and the sixth plugging portion can be plugged between the working cavity and the oil inlet cavity.

8. The proportional pressure reducing valve as set forth in claim 7, wherein: the oil return cavity is communicated with the second valve cavity through the third connecting hole, and the oil inlet cavity is communicated with the fourth valve cavity through the fourth connecting hole.

9. The proportional pressure reducing valve of claim 8, wherein: the outer valve core is further provided with a sixth connecting hole and a seventh connecting hole, one end of the sixth connecting hole is communicated with the fifth valve cavity, the other end of the sixth connecting hole is communicated with the eighth valve cavity, one end of the seventh connecting hole is communicated with the working cavity, and the other end of the seventh connecting hole is communicated with the ninth valve cavity.

10. The proportional pressure reducing valve of claim 9, wherein: and a third spring is arranged in the eighth valve cavity, a fourth spring is arranged in the ninth valve cavity, and the third spring and the fourth spring are respectively connected with two ends of the outer valve core in an abutting mode.

Technical Field

The invention belongs to the technical field of pressure reducing valves, and relates to a combined valve core structure and a proportional pressure reducing valve with the combined valve core structure.

Background

The pressure reducing valve is a common pressure control element in a hydraulic system, is a pressure regulating valve and is commonly used for stabilizing the working pressure of an oil way.

For example, a chinese patent with application number CN108662222A discloses a pilot-operated three-way proportional pressure reducing valve, which includes a main valve body, an oil return port is provided in the main valve body, the pilot-operated three-way proportional pressure reducing valve further includes a pilot valve, and the pilot valve includes: a pilot valve body; a proportional electromagnet; a maximum pressure protection mechanism; and a flow stabilizing mechanism.

However, the proportional pressure reducing valve is not compact in structure, adopts an integral valve core structure (i.e., adopts a complete valve core for control), is not sensitive enough in response during pressure adjustment, and cannot react quickly with pressure change, so that the proportional pressure reducing valve has no follow-up property (servo function) and has a certain improvement space.

Disclosure of Invention

The invention aims to provide a combined valve core structure and a proportional pressure reducing valve aiming at the problems in the prior art.

The purpose of the invention can be realized by the following technical scheme: a modular valve cartridge structure comprising:

the outer valve core is provided with a first valve hole along the axial direction, and the first valve hole comprises a first valve cavity, a second valve cavity, a third valve cavity, a fourth valve cavity, a fifth valve cavity, a sixth valve cavity and a seventh valve cavity which are sequentially communicated along the axial direction;

the inner valve core is movably arranged in the first valve hole, and two ends of the inner valve core are respectively positioned in the first valve cavity and the seventh valve cavity;

the peripheral surface of the inner valve core is sequentially provided with a first plugging part, a first annular groove, a second plugging part, a second annular groove, a third plugging part, a third annular groove and a fourth plugging part along the axial direction;

the first blocking part is blocked between the first valve cavity and the second valve cavity, the second valve cavity is communicated with the third valve cavity through the first annular groove, the second blocking part is blocked between the third valve cavity and the fourth valve cavity, the fourth valve cavity can be communicated with the fifth valve cavity through the second annular groove, the third blocking part can be blocked between the fourth valve cavity and the fifth valve cavity or can be blocked between the fifth valve cavity and the sixth valve cavity, the fifth valve cavity can be communicated with the sixth valve cavity through the third annular groove, and the fourth blocking part is blocked between the sixth valve cavity and the seventh valve cavity;

the inner valve core is provided with a first connecting hole and a second connecting hole, the first valve cavity is communicated with the third valve cavity through the first connecting hole, and the seventh valve cavity is communicated with the fifth valve cavity through the second connecting hole.

Preferably, a fifth blocking portion, a fourth annular groove and a sixth blocking portion are sequentially arranged on the circumferential surface of the outer valve element along the axial direction.

Preferably, the outer valve core is provided with a third connecting hole, one end of which is located at the fifth blocking portion and the other end of which is communicated with the second valve cavity.

Preferably, the outer valve core is further provided with a fourth connecting hole, one end of the fourth connecting hole is located at the sixth blocking portion, and the other end of the fourth connecting hole is communicated with the fourth valve cavity.

Preferably, the outer valve core is further provided with a fifth connecting hole, one end of the fifth connecting hole is communicated with the sixth valve cavity, and the other end of the fifth connecting hole is communicated with the third connecting hole.

Preferably, a first spring is arranged in the first valve cavity, a second spring is arranged in the seventh valve cavity, and the first spring and the second spring are respectively connected with two ends of the inner valve core in an abutting mode.

Secondly, provide a proportional pressure reducing valve, include combined valve core structure, still include:

the valve body is provided with a second valve hole, the outer valve core is movably arranged in the second valve hole, and the second valve hole comprises an eighth valve cavity, an oil return cavity, a working cavity, an oil inlet cavity and a ninth valve cavity which are sequentially communicated along the axial direction;

the fifth plugging portion is plugged between the eighth valve cavity and the oil return cavity, the sixth plugging portion is plugged between the ninth valve cavity and the oil inlet cavity, the oil return cavity can be communicated with the working cavity through the fourth annular groove, the working cavity can be communicated with the oil inlet cavity through the fourth annular groove, the fifth plugging portion can be plugged between the oil return cavity and the working cavity, and the sixth plugging portion can be plugged between the working cavity and the oil inlet cavity.

Preferably, the oil return cavity is communicated with the second valve cavity through the third connecting hole, and the oil inlet cavity is communicated with the fourth valve cavity through the fourth connecting hole.

Preferably, the outer valve core is further provided with a sixth connecting hole and a seventh connecting hole, one end of the sixth connecting hole is communicated with the fifth valve cavity and the other end is communicated with the eighth valve cavity, and one end of the seventh connecting hole is communicated with the working cavity and the other end is communicated with the ninth valve cavity.

Preferably, a third spring is arranged in the eighth valve cavity, a fourth spring is arranged in the ninth valve cavity, and the third spring and the fourth spring are respectively connected with two ends of the outer valve core in an abutting mode.

Compared with the prior art, the invention has the beneficial effects that:

1. the pilot valve control effect is realized through the combined valve core, the structure is very compact and ingenious, the action response is sensitive, and the servo following effect can be realized during pressure reduction.

2. Because the inner valve core and the outer valve core are both of floating structures, the inner valve core and the outer valve core can follow up according to the change of pressure, so that a servo effect is generated, and a pilot structure formed by the combined valve core has the advantage of large flow.

3. The pressure of the oil inlet cavity is transmitted to the fourth valve cavity and the fifth valve cavity through the fourth connecting hole, the pressure of the fifth valve cavity is transmitted to the seventh valve cavity through the second connecting hole, once the pressure of the oil inlet cavity is larger than the driving force applied by the ejector rod in the first valve cavity, the inner valve core can move towards the direction of the first valve cavity, the fifth valve cavity is communicated with the sixth valve cavity through the third annular groove, hydraulic medium can flow back into the oil return cavity from the fifth connecting hole and the third connecting hole, the pressure of the seventh valve cavity is reduced, namely the pressures at two ends of the inner valve core (the driving force of the ejector rod and the pressure of the seventh valve cavity) are balanced again, and the pressure of the eighth valve cavity and the pressure of the ninth valve cavity are balanced when the inner valve core is balanced, so that the actions of the inner valve core and the outer valve core are in dynamic balance.

4. During follow-up adjustment, when the pressure of the working chamber is smaller, the pressure of the ninth valve chamber is reduced, and the pressure of the eighth valve chamber is always equal to the driving force of the mandril, so that the inner valve core moves towards the ninth valve chamber, the opening amplitude of the sixth blocking part is increased, namely the opening between the oil inlet chamber and the working chamber is increased, so that more pressure oil enters the working chamber, and the pressure of the working chamber is increased until the pressure of the working chamber is the same as or proportional to the driving force of the mandril. When the pressure of the working cavity becomes large, the inner valve core moves towards the eighth valve cavity, the opening between the oil inlet cavity and the working cavity becomes small at the moment, and the working cavity is communicated with the oil return cavity to overflow, so that the pressure of the working cavity becomes small.

5. The fifth valve cavity is communicated with the seventh valve cavity through the second connecting hole, and the pressures of the two ends of the inner valve core are equal when the inner valve core is in a balanced state, namely the pressure of the seventh valve cavity is the same as or proportional to the acting force exerted by the proportional electromagnet mandril, so that the acting force exerted by the mandril determines the pressure of the eighth valve cavity, the pressure of the fifth valve cavity and the pressure of the seventh valve cavity.

Drawings

Fig. 1 is a schematic structural diagram of an outer valve core of the present invention.

Fig. 2 is a schematic structural view of the inner valve element of the present invention.

Fig. 3 is a schematic structural view of the valve body of the present invention.

Fig. 4 is a schematic structural diagram of the proportional pressure reducing valve of the present invention in a standby state.

FIG. 5 is a schematic view of the proportional pressure reducing valve of the present invention in a pressure reducing state.

Fig. 6 is a schematic structural view of the proportional pressure reducing valve of the present invention in a pressure maintaining state.

FIG. 7 is a schematic diagram of the proportional pressure reducing valve of the present invention in an overflow condition.

In the figure, 100, the outer valve core; 110. a fifth plugging portion; 120. a fourth annular groove; 130. a sixth sealing part; 140. a third connection hole; 150. a fourth connection hole; 160. a fifth connecting hole; 170. a sixth connection hole; 180. a seventh connection hole; 200. a first valve hole; 210. a first valve chamber; 220. a second valve cavity; 230. a third valve cavity; 240. a fourth valve cavity; 250. a fifth valve cavity; 260. a sixth valve cavity; 270. a seventh valve cavity; 280. a first spring; 290. a second spring; 300. an inner valve core; 310. a first blocking portion; 320. a first annular groove; 330. a second sealing part; 340. a second annular groove; 350. a third plugging portion; 360. a third annular groove; 370. a fourth blocking part; 380. a first connection hole; 390. A second connection hole; 400. a valve body; 500. a second valve hole; 510. an eighth valve cavity; 520. An oil return cavity; 530. a working chamber; 540. an oil inlet cavity; 550. a ninth valve cavity; 560. a third spring; 570. and a fourth spring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, and 4, a combined valve core structure includes: the outer valve core 100 can move, the inner valve core 300 can move in the outer valve core 100, the valve core assembly can be applied to a pressure reducing valve or other valves, the outer valve core 100 can move, the inner valve core 300 can move in the outer valve core 100, and the adjusting function is achieved through linkage action of the outer valve core 100 and the inner valve core 300.

The outer valve core 100 is provided with a first valve hole 200 along the axial direction, and the first valve hole 200 comprises a first valve cavity 210, a second valve cavity 220, a third valve cavity 230, a fourth valve cavity 240, a fifth valve cavity 250, a sixth valve cavity 260 and a seventh valve cavity 270 which are sequentially communicated along the axial direction.

Preferably, the outer valve core 100 has a stepped shaft structure, and a first valve hole 200 having a stepped hole structure is formed at the center thereof, and a transition cavity or a transition hole is formed between two adjacent valve cavities.

An inner valve core 300 movably disposed in the first valve hole 200, and both ends of the inner valve core 300 are located in the first valve chamber 210 and the seventh valve chamber 270, respectively; preferably, the inner valve core 300 has a stepped shaft structure, and the first valve cavity 210 and the seventh valve cavity 270 correspond to two ends of the inner valve core 300 respectively, and the plunger can push the inner valve core 300 and apply a force to the inner valve core 300.

A first blocking portion 310, a first annular groove 320, a second blocking portion 330, a second annular groove 340, a third blocking portion 350, a third annular groove 360 and a fourth blocking portion 370 are sequentially arranged on the circumferential surface of the inner valve element 300 along the axial direction; because the inner valve core 300 is in a stepped shaft structure, the blocking part is in an annular protruding structure, and only the blocking part can block the transition part between the adjacent valve cavities, the adjacent valve cavities can be communicated or isolated by moving along with the inner valve core 300.

The first blocking part 310 is blocked between the first valve chamber 210 and the second valve chamber 220, the second valve chamber 220 is communicated with the third valve chamber 230 through the first annular groove 320, the second blocking part 330 is blocked between the third valve chamber 230 and the fourth valve chamber 240, the fourth valve chamber 240 is communicated with the fifth valve chamber 250 through the second annular groove 340, the third blocking part 350 is blocked between the fourth valve chamber 240 and the fifth valve chamber 250 or between the fifth valve chamber 250 and the sixth valve chamber 260, the fifth valve chamber 250 is communicated with the sixth valve chamber 260 through the third annular groove 360, and the fourth blocking part 370 is blocked between the sixth valve chamber 260 and the seventh valve chamber 270.

Preferably, regardless of the motion of the inner spool 300, the first blocking portion 310 is always blocked between the first valve chamber 210 and the second valve chamber 220, while the second valve chamber 220 and the third valve chamber 230 are always communicated through the first annular groove 320, and the third valve chamber 230 and the fourth valve chamber 240 are always isolated through the second blocking portion 330.

The fourth valve chamber 240 and the fifth valve chamber 250 may be communicated or isolated, and the fourth valve chamber 240, the fifth valve chamber 250 and the sixth valve chamber 260 are linked through the inner valve core 300.

More specifically, when the pressure reducing valve is in the standby state, the third blocking portion 350 blocks between the fourth valve chamber 240 and the fifth valve chamber 250, and the fifth valve chamber 250 and the sixth valve chamber 260 communicate through the third annular groove 360.

When the pressure reducing valve is in a pressure reducing state, the fourth valve chamber 240 and the fifth valve chamber 250 communicate through the second annular groove 340, and the third blocking portion 350 blocks between the fifth valve chamber 250 and the sixth valve chamber 260.

When the pressure reducing valve is in the pressure maintaining state, the third blocking part 350 is located in the fifth valve chamber 250, and with the fine movement of the inner valve chamber, the fifth valve chamber 250 can be communicated with the fourth valve chamber 240 or the sixth valve chamber 260 according to the pressure change, when the fifth valve chamber 250 is communicated with the fourth valve chamber 240, the fifth valve chamber 250 is isolated from the sixth valve chamber 260, and when the fifth valve chamber 250 is communicated with the sixth valve chamber 260, the fifth valve chamber 250 is isolated from the fourth valve chamber 240.

The inner spool 300 is provided with a first connection hole 380 and a second connection hole 390, the first valve chamber 210 communicates with the third valve chamber 230 through the first connection hole 380, and the seventh valve chamber 270 communicates with the fifth valve chamber 250 through the second connection hole 390.

Preferably, the pressure of the third valve chamber 230 can be transmitted to the first valve chamber 210 through the first connection hole 380, and the pressure of the fifth valve chamber 250 can be transmitted to the seventh valve chamber 270 through the second connection hole 390.

That is, the pressure in first valve chamber 210 is equal to the pressure in third valve chamber 230 and the pressure in seventh valve chamber 270 is equal to the pressure in fifth valve chamber 250.

Simply put, it is ensured that first valve chamber 210 and third valve chamber 230 are at the same pressure and that fifth valve chamber 250 and seventh valve chamber 270 are at the same pressure. Once the pressure changes, the first valve chamber 210 or the seventh valve chamber 270 can push the inner valve spool 300.

The pilot valve control effect is realized through the combined valve core, the whole structure is very compact and ingenious, the action response is sensitive, and the servo following effect can be realized during pressure reduction.

As shown in fig. 1, 2, 3, and 4, in the above embodiment, the fifth blocking portion 110, the fourth annular groove 120, and the sixth blocking portion 130 are provided on the circumferential surface of the outer valve body 100 in this order in the axial direction.

Because the outer valve core 100 is of a stepped shaft structure and is provided with the fifth plugging portion 110 and the sixth plugging portion 130 which are in annular protruding structures, the fifth plugging portion 110, the fourth annular groove 120 and the sixth plugging portion 130 are used for controlling the communication or isolation of each cavity, the ejector rod of the proportional electromagnet can control the inner valve core 300, and the inner valve core 300 can control the outer valve core 100, so that the control effect is realized.

As shown in fig. 1, 2, 3, and 4, in addition to the above embodiment, the outer valve body 100 is provided with a third connection hole 140, and one end of the third connection hole 140 is located at the fifth blocking portion 110 and the other end thereof communicates with the second valve chamber 220.

Preferably, two openings of the third connection hole 140 are respectively located on the surface of the fifth blocking portion 110 and communicate with the second valve chamber 220. In practical structure, the pressure of the second valve chamber 220 can be relieved to the return oil chamber 520 through the third connecting hole 140, that is, the second valve chamber 220 is always in a state of zero pressure, and the pressure of the chamber body communicated with the second valve chamber 220 is also zero.

As shown in fig. 1, 2, 3, and 4, in addition to the above embodiment, the outer valve body 100 is further provided with a fourth connection hole 150, and one end of the fourth connection hole 150 is located in the sixth blocking portion 130 and the other end thereof communicates with the fourth valve chamber 240.

Preferably, two openings of the fourth connection hole 150 are respectively in communication with the surface of the sixth blocking portion 130 and the fourth valve chamber 240. In the actual structure, the fourth valve chamber 240 communicates with the oil inlet chamber 540 through the fourth connecting hole 150, so the pressure of the fourth valve chamber 240 is the pressure of the oil inlet chamber 540.

As shown in fig. 1, 2, 3 and 4, in addition to the above embodiment, the outer valve body 100 is further provided with a fifth connection hole 160, and one end of the fifth connection hole 160 is communicated with the sixth valve chamber 260 and the other end is communicated with the third connection hole 140.

Preferably, the sixth valve chamber 260 can communicate with the oil return chamber 520, so the pressure of the sixth valve chamber 260 is also zero, and when the fifth valve chamber 250 communicates with the sixth valve chamber 260, the fifth valve chamber 250 can be depressurized by the sixth valve chamber 260.

As shown in fig. 1, 2, 3, and 4, in addition to the above embodiments, a first spring 280 is disposed in the first valve chamber 210, a second spring 290 is disposed in the seventh valve chamber 270, and the first spring 280 and the second spring 290 are respectively connected to two ends of the inner valve core 300 in an abutting manner. Preferably, the first and second springs 280 and 290 can apply elastic force to both ends of the inner spool 300, thereby centering the inner spool 300 and maintaining a standby state without an external force.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, in addition to the above embodiments, a proportional pressure reducing valve includes the above-described combination type valve body structure, and further includes: the valve body 400, the outer valve core 100 is arranged in the valve body 400, the inner valve core 300 is arranged in the outer valve core 100, and the outer valve core 100 acts in the valve body 400 so as to realize the function of proportional pressure reduction.

The valve body 400 is provided with a second valve hole 500, the outer valve spool 100 is movably arranged in the second valve hole 500, and the second valve hole 500 comprises an eighth valve cavity 510, an oil return cavity 520, a working cavity 530, an oil inlet cavity 540 and a ninth valve cavity 550 which are sequentially communicated along the axial direction; preferably, the second valve hole 500 has a stepped hole structure, hydraulic oil enters into the oil inlet chamber 540, so the oil inlet chamber 540 is a pressure chamber, hydraulic oil can enter into the working chamber 530 when the oil inlet chamber 540 communicates with the working chamber 530, and the pressure of the working chamber 530 becomes greater when an opening between the oil inlet chamber 540 and the working chamber 530 increases, and the pressure of the working chamber 530 becomes smaller when the opening decreases; and the working chamber 530 pressure decreases when the openings of the working chamber 530 and the return chamber 520 are opened.

The fifth blocking portion 110 is blocked between the eighth valve chamber 510 and the oil return chamber 520, the sixth blocking portion 130 is blocked between the ninth valve chamber 550 and the oil inlet chamber 540, the oil return chamber 520 can be communicated with the working chamber 530 through the fourth annular groove 120, the working chamber 530 can be communicated with the oil inlet chamber 540 through the fourth annular groove 120, the fifth blocking portion 110 can be blocked between the oil return chamber 520 and the working chamber 530, and the sixth blocking portion 130 can be blocked between the working chamber 530 and the oil inlet chamber 540.

Preferably, the eighth valve chamber 510 can push the outer valve core 100 to move toward the ninth valve chamber 550, and the ninth valve chamber 550 can push the outer valve core 100 to move toward the eighth valve chamber 510.

When the pressure reducing valve is in a standby state, the working chamber 530 and the oil return chamber 520 communicate through the fourth annular groove 120, and the sixth blocking portion 130 blocks between the working chamber 530 and the oil inlet chamber 540, so that the pressure of the working chamber 530 can be relieved to zero pressure.

When the pressure reducing valve is in a pressure reducing state, the outer valve element 100 moves to a corresponding position, the fifth blocking part 110 is blocked between the oil return cavity 520 and the working cavity 530, the oil inlet cavity 540 is communicated with the working cavity 530 through the fourth annular groove 120, and the acting force applied to the inner valve element 300 by the ejector rod of the proportional electromagnet can control the size of the opening formed by the fourth annular groove 120, so that the pressure of the working cavity 530 is controlled.

When the pressure reducing valve is in the pressure maintaining state, the fifth blocking portion 110 just blocks between the oil return chamber 520 and the working chamber 530 and can be opened at any time, and the sixth blocking portion 130 just blocks between the working chamber 530 and the oil inlet chamber 540 and can be opened at any time, so that the working chamber 530 can be communicated with the oil return chamber 520 or the oil inlet chamber 540 once the outer valve core 100 slightly moves, and the working chamber 530 is maintained at the set pressure.

When the pressure reducing valve is in the relief state, the fifth blocking portion 110 is opened, and the working chamber 530 communicates with the oil return chamber 520 through the fourth annular groove 120, so that the pressure of the working chamber 530 is relieved through the oil return chamber 520, and the sixth blocking portion 130 is blocked between the oil inlet chamber 540 and the working chamber 530.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, in addition to the above embodiments, the oil return chamber 520 communicates with the second valve chamber 220 through the third connection hole 140, and the oil inlet chamber 540 communicates with the fourth valve chamber 240 through the fourth connection hole 150. Preferably, the second valve chamber 220 is in communication with the return chamber 520, so that the pressure in the second valve chamber 220 is zero; and the pressure in the fourth valve chamber 240 is the same as the pressure in the oil inlet chamber 540.

As shown in fig. 1, in addition to the above-described embodiment, the outer spool 100 is further provided with a sixth connection hole 170 and a seventh connection hole 180, one end of the sixth connection hole 170 communicates with the fifth valve chamber 250 and the other end communicates with the eighth valve chamber 510, and one end of the seventh connection hole 180 communicates with the working chamber 530 and the other end communicates with the ninth valve chamber 550.

Preferably, the pressure of the eighth valve chamber 510 is the same as that of the fifth valve chamber 250, that is, the pressure of the fifth valve chamber 250 can be transmitted to the eighth valve chamber 510, the pressure of the ninth valve chamber 550 is the same as that of the working chamber 530, that is, the pressure of the working chamber 530 can be transmitted to the ninth valve chamber 550, when the outer valve core 100 is in a balanced state, the pressure of the eighth valve chamber 510 is equal to that of the ninth valve chamber 550, once the pressure of the ninth valve chamber 550 increases or decreases, the outer valve core 100 and the inner valve core 300 can follow up, so as to adjust until the pressures of the eighth valve core and the ninth valve chamber 550 are equal and restore to balance again.

It should be noted that the first valve chamber 210, the seventh valve chamber 270, the eighth valve chamber 510 and the ninth valve chamber 550 are all closed cavity structures.

As shown in fig. 1, 2, 3, and 4, in addition to the above embodiments, a third spring 560 is disposed in the eighth valve chamber 510, a fourth spring 570 is disposed in the ninth valve chamber 550, and the third spring 560 and the fourth spring 570 are respectively connected to two ends of the outer valve core 100 in an abutting manner. Preferably, the third spring 560 can push the outer valve core 100 to move toward the ninth valve chamber 550, the fourth spring 570 can push the outer valve core 100 to move toward the eighth valve chamber 510, and the third spring 560 and the fourth spring 570 can apply elastic force to both ends of the outer valve core 100, so that the outer valve core 100 is centrally reset and maintained in a standby state without external force.

In view of the operation principle, as shown in fig. 1, 2, 3, 4, 5, 6, and 7, the oil inlet chamber 540 communicates with the fourth valve chamber 240 through the fourth connection hole 150, and when the inner valve body 300 is in the standby state in the center, the third blocking portion 350 blocks between the fourth valve chamber 240 and the fifth valve chamber 250.

In the decompression state, when the push rod pushes the inner valve core 300 to move towards the seventh valve cavity 270, the fourth valve cavity 240 is communicated with the fifth valve cavity 250 through the second annular groove 340, and the pressure of the fifth valve cavity 250 is the same as that of the oil inlet cavity 540.

Since the eighth valve chamber 510, the fifth valve chamber 250 and the seventh valve chamber 270 are communicated, the pressure in the eighth valve chamber 510, the fifth valve chamber 250 and the seventh valve chamber 270 is the same, once the pressure in the fifth valve chamber 250 exists, the eighth valve chamber 510 can push the outer valve core 100 to move towards the ninth valve chamber 550, at this time, the sixth blocking portion 130 is opened to communicate the oil inlet chamber 540 with the working chamber 530, and the fifth blocking portion 110 is blocked between the working chamber 530 and the oil return chamber 520.

It should be added that, since the fifth valve cavity 250 is communicated with the seventh valve cavity 270 through the second connection hole 390, and pressures at two ends of the inner valve core 300 are equal when the inner valve core 300 is in a balanced state, that is, the pressure of the seventh valve cavity 270 is the same as or proportional to the acting force exerted by the proportional electromagnet tappet, the acting force exerted by the tappet determines the pressure of the eighth valve cavity 510, the pressure of the fifth valve cavity 250, and the pressure of the seventh valve cavity 270.

Since the ninth valve chamber 550 is communicated with the working chamber 530 through the seventh connecting hole 180, the pressure of the ninth valve chamber 550 is the same as the pressure of the working chamber 530, the pressure of the eighth valve chamber 510 is the control pressure applied by the proportional solenoid rod, and the pressures of the eighth valve chamber 510 and the ninth valve chamber 550 are the same, if the pressures of the eighth valve chamber 510 and the ninth valve chamber 550 are different, the outer valve core 100 will move until the pressures of the eighth valve chamber 510 and the ninth valve chamber 550 are the same.

Since the ninth valve chamber 550 is communicated with the working chamber 530 through the seventh connecting hole 180, the pressure of the ninth valve chamber 550 is the same as that of the working chamber 530, and therefore the pressure of the working chamber 530 is the same as or proportional to the driving force applied by the ram.

More specifically, since the pressure of the oil inlet chamber 540 is transmitted to the fourth valve chamber 240 and the fifth valve chamber 250 through the fourth coupling hole 150, and the pressure in the fifth valve chamber 250 is transmitted to the seventh valve chamber 270 through the second connecting hole 390, once the pressure in the oil inlet chamber 540 is higher than the driving force applied by the top rod in the first valve chamber 210, the inner valve core 300 moves toward the first valve chamber 210, and the fifth valve chamber 250 communicates with the sixth valve chamber 260 through the third annular groove 360, the hydraulic medium can flow back into the oil return chamber 520 from the fifth connecting hole 160 and the third connecting hole 140, so that the pressure of the seventh valve chamber 270 is reduced, namely, the pressures at both ends of the inner spool 300 (the driving force of the plunger rod and the pressure of the seventh valve chamber 270) are balanced again, and the pressure of the eighth valve chamber 510 and the pressure of the ninth valve chamber 550 are balanced when the inner spool 300 is balanced, the motion of the inner spool 300 and the outer spool 100 are in dynamic balance.

In the servo-regulation process, when the pressure of the working chamber 530 becomes smaller, the pressure of the ninth valve chamber 550 decreases, and the pressure of the eighth valve chamber 510 is always equal to the driving force of the tappet, so the inner valve core 300 moves towards the ninth valve chamber 550, and at this time, the opening amplitude of the sixth blocking part 130 becomes larger, that is, the opening between the oil inlet chamber 540 and the working chamber 530 becomes larger, so more pressure oil enters the working chamber 530, and the pressure of the working chamber 530 increases until the pressure of the working chamber 530 is equal to or proportional to the driving force of the tappet.

In the relief state, when the pressure of the working chamber 530 becomes large, the inner spool 300 moves in the direction of the eighth valve chamber 510, the opening between the oil inlet chamber 540 and the working chamber 530 becomes small, and the working chamber 530 communicates with the return chamber 520 to relief, so that the pressure of the working chamber 530 becomes small.

In the pressure maintaining state, the fifth and sixth blocking portions 110 and 130 just close the working chamber 530 and maintain a state of being opened at any time, so that the inner spool 300 can maintain the working chamber 530 at a set pressure during fine adjustment.

Therefore, the pressure reducing valve with the structure skillfully balances the pressure at the two ends of the inner valve core 300, so that the pressure of the seventh valve cavity 270 is the same as the driving force of the mandril, and the pressure of the working cavity 530 is the same as or proportional to the pressure of the mandril through the movement of each valve cavity and the outer valve core 100, so that the whole structure is very skillful.

In addition, since the inner valve core 300 and the outer valve core 100 are both floating structures, they can follow up according to the pressure change, thereby generating a servo effect, and the pilot structure formed by the combined valve core has the advantage of large flow.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Moreover, descriptions of the present invention as relating to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.