Bidirectional stop reversing valve and pressure relief structure thereof

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a two-way stop reversing valve and a pressure relief structure thereof. The pressure relief structure comprises a first valve sleeve and a second valve sleeve, wherein a first valve port, a second valve port and a liquid drainage port are formed in the first valve sleeve; the main valve element and the pilot valve element are movably arranged in the first valve sleeve, and a first liquid channel connected with the first valve port and the second valve port is formed in the main valve element; a pressure relief channel communicated with the first liquid channel is formed in the second valve sleeve, the pilot valve element is in sliding connection with the second valve sleeve, and the pilot valve element slides along the second valve sleeve to achieve communication or cut-off of the liquid drainage opening and the pressure relief channel. The two-way cut-off reversing valve comprises the pressure relief structure and a driving part used for driving the pilot valve element to move in the second valve sleeve. The technical problems that in the prior art, a pilot valve element is closed in the moving space between a valve sleeve and a main valve element, hydraulic impact in a two-way stop reversing valve is difficult to effectively buffer or release, and switching is stuck or response is slow are solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a bidirectional shut-off reversing valve and its pressure relief structure. Background Technology

[0002] Directional control valves are core control components in the hydraulic systems of engineering machinery, used to precisely switch the direction or open / close of oil circuits to drive actuators (such as cylinders and motors) to complete complex actions. Currently, the pilot valve core of most bidirectional shut-off directional control valves on the market has a relatively enclosed space between the valve sleeve and the main valve core. When the hydraulic system frequently switches directions, the rapid opening and closing of the main valve core can instantly cut off or change the high-speed flow of the fluid. The enormous kinetic energy contained within this fluid cannot be effectively buffered or released in the confined space, resulting in severe pressure pulsations, or hydraulic shocks. These shocks repeatedly act on the inside of the bidirectional shut-off directional control valve, connecting pipelines, and other precision components within the system (such as pumps, cylinders, and seals), thereby reducing the service life and reliability of components within the hydraulic system. Furthermore, under the influence of complex oil pressure and mechanical friction, uneven force on the main valve core may occur, leading to switching jamming or slow response, affecting the system's dynamic performance and control accuracy. Utility Model Content

[0003] To address the technical problem in existing technologies where the pilot valve core's movement space between the valve sleeve and the main valve core is closed, resulting in difficulty in effectively buffering or releasing hydraulic shocks within the bidirectional shut-off directional valve, leading to switching jamming or slow response, this utility model provides a pressure relief structure and a bidirectional shut-off directional valve, thus solving the aforementioned technical problems.

[0004] To solve the above-mentioned technical problems, this utility model provides a bidirectional shut-off reversing valve pressure relief structure, comprising: a first valve sleeve having a first valve port, a second valve port, and a drain port formed thereon; a main valve core and a pilot valve core movably disposed within the first valve sleeve, the main valve core having a first liquid passage connected to the first valve port and the second valve port respectively; a second valve sleeve disposed between the main valve core and the pilot valve core, the second valve sleeve having a pressure relief channel communicating with the first liquid passage, the pilot valve core being slidably connected to the second valve sleeve, the pilot valve core sliding along the second valve sleeve to realize the connection or shut-off of the drain port and the pressure relief channel.

[0005] According to one embodiment of the present invention, the first liquid channel includes a first liquid port connected to the first valve port, a second liquid port connected to the second valve port, and a third liquid port connected to the first liquid port and the second liquid port. The connection points of the first liquid port, the second liquid port and the third liquid port are respectively provided with a first ball and a second ball. A retaining ring is also provided in the third liquid port for limiting the first ball and the second ball. The side of the third liquid port away from the connection point is connected to the pressure relief channel.

[0006] According to one embodiment of the present invention, the pressure relief channel includes a fourth liquid port, a first liquid chamber and a fifth liquid port that are connected. The fourth liquid port is connected to the first liquid channel. The first liquid chamber is provided with a sixth liquid port connected to the fourth liquid port and a seventh liquid port that is wedge-shaped and cooperates with the pilot valve core at both ends. The fifth liquid port is connected to the drain port.

[0007] According to one embodiment of the present invention, the second valve sleeve is further provided with a liquid passage groove connected to the fourth liquid port, wherein the liquid inlet cross-sectional dimension of the liquid passage groove is larger than the cross-sectional dimension of the fourth liquid port.

[0008] According to one embodiment of the present invention, the main valve core is a conical valve core, the first valve port and the second valve port are connected through a conical surface inside the first valve sleeve, and a reset member is installed on the second valve sleeve. The reset member is used to provide a reset force for the conical valve core so that the conical valve core abuts against the conical surface.

[0009] According to one embodiment of the present invention, a sealing member is provided inside the second valve sleeve, and the sealing member is provided with a groove suitable for the pilot valve core to extend into. The pilot valve core is also provided with a second liquid channel. One side of the second liquid channel is connected to the drain port, and the other side of the second liquid channel is connected to the groove. A sealing ring is provided between the groove and the second valve sleeve.

[0010] This utility model also provides a bidirectional shut-off reversing valve, including: a bidirectional shut-off reversing valve pressure relief structure as described above and a driving member disposed on the first valve sleeve, wherein the driving member is used to drive the pilot valve core to slide within the second valve sleeve, so that the pilot valve core and the second valve sleeve are in clearance fit or tight fit.

[0011] According to one embodiment of the present invention, the driving component includes a magnetic core tube assembly mounted on the first valve sleeve and an electromagnetic coil sleeved on the magnetic core tube assembly. The magnetic core tube assembly is provided with an armature and an elastic element. One end of the armature is connected to the pilot valve core, and the other end of the armature is connected to the elastic element, so that the armature moves along the slidable direction of the pilot valve core through the elastic element.

[0012] According to one embodiment of the present invention, the armature has a hollow structure, and the armature and the pilot valve core are movably connected through a groove between them, so that the third liquid cavity formed between the armature and the magnetic core tube assembly is connected to the drain port.

[0013] According to one embodiment of the present invention, the magnetic core tube assembly includes a core tube seat, a sleeve, and a magnetic plug connected in sequence. The outer end face of the core tube seat is connected to the first valve sleeve, and the inner end face of the core tube seat is connected to the second valve sleeve. The electromagnetic coil is sleeved on the sleeve, and the end of the elastic member away from the armature abuts against the magnetic plug.

[0014] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0015] The pressure relief structure of the bidirectional shut-off directional valve of this utility model is achieved by setting a drain port in the first valve sleeve and setting a pressure relief channel in the second valve sleeve that communicates with the first liquid passage in the main valve core. The pilot valve core slides along the second valve sleeve to achieve connection or shut-off between the drain port and the pressure relief channel. This can help to quickly release or establish the pressure between the pilot valve core, valve sleeve and main valve core when the bidirectional shut-off directional valve is switched, ensuring the service life and reliability of the components in the hydraulic system, improving the system stability and response speed, and ensuring the dynamic performance and control accuracy of the system.

[0016] By setting a liquid inlet cross-sectional area larger than the inlet of the pressure relief channel (i.e., the fourth liquid port) in the second valve sleeve, a liquid passage groove with a cross-sectional area larger than the inlet of the pressure relief channel can be set up to prevent the main valve core from being difficult to separate after it comes into contact with the second valve sleeve when it moves in the first valve sleeve. This avoids the main valve core resetting slowly and the micro-movement of the actuator after the liquid supply is cut off or the power is cut off. When the main valve core is not in contact with the second valve sleeve, the structural design of the liquid passage groove and the fourth liquid port can create a large pressure difference between the pressure relief channel and the first or second valve port, thereby enabling the main valve core to move quickly and come into contact with the second valve sleeve, directly connecting the first liquid passage and the pressure relief channel to achieve a large flow rate.

[0017] By setting a first ball and a second ball at the connection between the first liquid port, the second liquid port and the third liquid port of the first liquid channel, and setting a retaining ring at the third liquid port to limit the ball, the liquid entering the third liquid port will not flow out through the first liquid port or the second liquid port, thereby achieving the function of bidirectional cut-off. The structure is simple, the design is ingenious, the installation is convenient, and the manufacturing and maintenance costs are low.

[0018] The pilot valve core is also provided with a second liquid passage that communicates with the drain port and the groove in the sealing component, so that the liquid can play a role in lubrication and pressure balance between the second valve sleeve and the pilot valve core, and can avoid pressure concentration in the groove, which would cause the pilot valve core to move uncontrollably.

[0019] The bidirectional shut-off valve of this invention features a hollow armature that is movably connected to the pilot valve core via a groove between them. This allows the third liquid chamber formed between the armature and the magnetic core tube assembly to communicate with the drain port. When the electromagnetic coil is energized, the armature can quickly pull the pilot valve core. When the electromagnetic coil is de-energized, the armature can quickly reset the pilot valve core, thereby improving the response time of the bidirectional shut-off valve. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the pressure relief structure of the bidirectional shut-off reversing valve of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the first valve sleeve;

[0022] Figure 3 A cross-sectional view of the main valve core;

[0023] Figure 4 This is a schematic diagram of the second valve sleeve.

[0024] Figure 5 This is a schematic diagram of the pilot valve core.

[0025] Figure 6 This is a cross-sectional view of the bidirectional shut-off reversing valve of this utility model;

[0026] Figure 7 This is a schematic diagram of the bidirectional shut-off reversing valve of this utility model;

[0027] Figure 8 This is a cross-sectional view of the magnetic core tube assembly of this utility model;

[0028] Figure 9 for Figure 6 The diagram shows the functional principle of the bidirectional shut-off reversing valve.

[0029] In the diagram: 1-First valve sleeve; 11-First valve port; 12-Second valve port; 13-Drain port; 14-Second liquid chamber; 15-Conical surface; 2-Main valve core; 21-First liquid port; 22-Second liquid port; 23-Third liquid port; 24-First ball bearing; 25-Second ball bearing; 26-Retaining ring; 27-Gap; 3-Pilot valve core; 31-Second liquid passage; 311-Eighth liquid port; 312-Ninth liquid port; 4-Second valve sleeve; 41-Fourth liquid port; 42 - First liquid chamber; 43- Fifth liquid port; 44- Sixth liquid port; 45- Seventh liquid port; 46- Liquid passage groove; 5- Sealing element; 51- O-ring; 52- Limiting retaining ring; 6- Blocking element; 61- Groove; 7- Sealing ring; 8- Reset element; 9- Driving element; 91- Magnetic core tube assembly; 911- Core tube seat; 912- Sleeve; 913- Magnetic plug; 914- Nut; 92- Electromagnetic coil; 93- Armature; 94- Elastic element; 95- Third liquid chamber. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a bidirectional shut-off reversing valve pressure relief structure, including: a first valve sleeve 1, a main valve core 2, a pilot valve core 3, and a second valve sleeve 4. The first valve sleeve 1 has a first valve port 11, a second valve port 12, and a drain port 13. The main valve core 2 and the pilot valve core 3 are movably disposed within the first valve sleeve 1. The main valve core 2 has a first liquid passage connected to the first valve port 11 and the second valve port 12, respectively. The second valve sleeve 4 is disposed between the main valve core 2 and the pilot valve core 3. The second valve sleeve 4 has a pressure relief channel communicating with the first liquid passage. The pilot valve core 3 is slidably connected to the second valve sleeve 4. The pilot valve core 3 slides along the second valve sleeve 4 to achieve communication or shut-off between the drain port 13 and the pressure relief channel.

[0037] It is understandable that, due to the sliding connection between the pilot valve core 3 and the second valve sleeve 4, the pilot valve core 3 slides along the second valve sleeve 4 to connect or disconnect the drain port 13 from the pressure relief channel. Specifically, when the pilot valve core 3 and the second valve sleeve 4 are in clearance fit, the drain port 13 is connected to the pressure relief channel. This allows the hydraulic system to buffer and release the hydraulic shock formed between the pilot valve core 3, the valve sleeve, and the main valve core 2 by the liquid entering the bidirectional shut-off valve from the first valve port 11 or the second valve port 12 during reversal, through the connected pressure relief channel and drain port 13, thus ensuring the service life and reliability of the components in the hydraulic system. When the pilot valve core 3 is in sliding reset and tightly fitted with the second valve sleeve 4, the drain port 13 is disconnected from the pressure relief channel, thereby quickly establishing the pressure between the pilot valve core 3, the valve sleeve, and the main valve core 2, improving system stability and response speed, and ensuring the dynamic performance and control accuracy of the system.

[0038] like Figure 1 and Figure 3 As shown, in one embodiment of this utility model, the first liquid channel may include a first liquid port 21 connected to the first valve port 11, a second liquid port 22 connected to the second valve port 12, and a third liquid port 23 connected to the first liquid port 21 and the second liquid port 22. A first ball bearing 24 and a second ball bearing 25 are respectively provided at the connection points of the first liquid port 21, the second liquid port 22, and the third liquid port 23. A retaining ring 26 is also provided inside the third liquid port 23 to limit the movement of the first ball bearing 24 and the second ball bearing 25. The side of the third liquid port 23 away from the connection point is connected to a pressure relief channel. The first ball bearing 24 and the second ball bearing 25 can be steel balls, and the retaining ring 26 can be a wire retaining ring for holes, etc., and this embodiment does not impose any limitations.

[0039] Since the first liquid port 21, the second liquid port 22 and the third liquid port 23 are respectively provided with the first ball 24 and the second ball 25, and the third liquid port 23 is also provided with the retaining ring 26 to limit the first ball 24 and the second ball 25, the liquid entering the third liquid port 23 will not flow out through the first liquid port 21 or the second liquid port 22, thus achieving the function of bidirectional cutoff. The structure is simple, the design is ingenious, the installation is convenient, and the manufacturing and maintenance costs are low.

[0040] As a preferred embodiment, the pressure relief channel includes a fourth liquid port 41, a first liquid chamber 42, and a fifth liquid port 43. The fourth liquid port 41 is connected to the first liquid channel. The first liquid chamber 42 has a sixth liquid port 44 connected to the fourth liquid port 41 and a seventh liquid port 45 suitable for wedge-shaped engagement with the pilot valve core 3 at both ends. The fifth liquid port 43 is connected to the drain port 13. There can be multiple fourth liquid ports 41, evenly distributed within the second valve sleeve 4. There can also be multiple sixth liquid ports 44, each corresponding to one fourth liquid port 41, to improve pressure relief efficiency and stability. The diameter of the first liquid chamber 42 formed between the multiple sixth liquid ports 44 and the seventh liquid port 45 is greater than or equal to the minimum diameter of the seventh liquid port 45, so that the first liquid chamber 42 has a certain liquid storage capacity, reducing the impact on the pilot valve core 3 when liquid enters rapidly. This embodiment does not limit the diameter difference between the two, as long as the multiple fourth liquid ports 41 can connect to the first liquid chamber 42.

[0041] like Figure 1 and Figure 4 As shown, as a preferred technical solution of this embodiment, the second valve sleeve 4 may also be provided with a liquid passage groove 46 connected to the fourth liquid port 41. The liquid inlet cross-sectional dimension of the liquid passage groove 46 is larger than the cross-sectional dimension of the fourth liquid port 41. This can prevent the main valve core 2 from being difficult to separate after it is in contact with the second valve sleeve 4 when it moves in the first valve sleeve 1, and avoid the main valve core 2 from resetting slowly, resulting in the micro-motion of the actuator after the liquid supply is cut off or the power is cut off. When the main valve core 2 is not in contact with the second valve sleeve 4, the structural design of the liquid passage groove 46 and the fourth liquid port 41 can make there a large pressure difference between the pressure relief channel and the first valve port 11 or the second valve port 12, so that the main valve core 2 moves quickly, so that the main valve core 2 is in contact with the second valve sleeve 4, and the first liquid passage and the pressure relief channel are directly connected to achieve a large flow rate.

[0042] As a preferred embodiment, the first liquid channel and the pressure relief channel are connected through the second liquid chamber 14. A sealing element 5 is provided between the second valve sleeve 4 and the first valve sleeve 1. The sealing element 5 is located between the second liquid chamber 14 and the drain port 13 to prevent liquid from leaking out of the drain port 13 from the gap between the second valve sleeve 4 and the first valve sleeve 1 when the drain port 13 is closed to the pressure relief channel. The sealing element 5 may include an O-ring 51 sleeved on the second valve sleeve 4 and a retaining ring 52 for cooperating with the second valve sleeve 4 to limit the position of the O-ring 51.

[0043] like Figure 1 and Figure 5As shown, in a preferred embodiment, the second valve sleeve 4 is provided with a sealing member 6, and the sealing member 6 is provided with a groove 61 suitable for the pilot valve core 3 to extend into. The pilot valve core 3 is also provided with a second liquid passage 31. The eighth liquid port 311 of the second liquid passage 31 is connected to the drain port 13, and the ninth liquid port 312 of the second liquid passage 31 is connected to the groove 61, so that the liquid can play a role in lubrication and pressure balance between the second valve sleeve 4 and the pilot valve core 3. A sealing ring 7 can be provided between the groove 61 and the second valve sleeve 4 to prevent the groove 61 and the second liquid passage 31 from being directly connected through the sliding gap between the pilot valve core 3 and the second valve sleeve 4. Since the second liquid passage 31 in the pilot valve core 3 is connected to the drain port 13 and the groove 61 respectively, pressure concentration in the groove 61 can be avoided, which would cause the pilot valve core 3 to move uncontrollably.

[0044] As a preferred embodiment, the main valve core 2 can be a conical valve core. The first valve port 11 and the second valve port 12 are connected by a conical surface 15 inside the first valve sleeve 1. A reset member 8 is installed on the second valve sleeve 4. The reset member 8 is used to provide a reset force for the conical valve core so that the conical valve core abuts against the conical surface 15. Since the distance between the conical valve core and the second valve sleeve 4 is the stroke of the conical valve core, and the stroke is relatively large, it is beneficial for the bidirectional shut-off reversing valve to achieve a large flow rate. The reset member 8 can be a spring. One end of the spring can be sleeved on a fixing member installed on the second valve sleeve 4, such as on the sealing member 6 or on the protrusion on the second valve sleeve 4, and the other end of the spring abuts against the conical valve core.

[0045] like Figure 6 and Figure 7 As shown, this embodiment also provides a bidirectional shut-off reversing valve, including the aforementioned bidirectional shut-off reversing valve pressure relief structure and a driving member 9 disposed on one side of the first valve sleeve 1. The driving member 9 is used to drive the pilot valve core 3 to slide within the second valve sleeve 4, so that the pilot valve core 3 and the second valve sleeve 4 are in clearance fit or tight fit. The bidirectional shut-off reversing valve according to this embodiment of the present invention, due to including the aforementioned bidirectional shut-off reversing valve pressure relief structure, also possesses the aforementioned beneficial effects.

[0046] As a preferred technical solution of this embodiment, the driving component 9 may include a magnetic core tube assembly 91 mounted on the first valve sleeve 1, an electromagnetic coil 92 sleeved on the magnetic core tube assembly 91, an armature 93 and an elastic element 94. The magnetic core tube assembly 91 is provided with an armature 93 and an elastic element 94. One end of the armature 93 is connected to the pilot valve core 3, and the other end of the armature 93 is connected to the elastic element 94, so that the armature 93 moves along the sliding direction of the pilot valve core 3 through the elastic element 94.

[0047] In one specific embodiment of this utility model, the elastic element 94 can be a spring, and the armature 93 can be a hollow structure, which is movably connected to the pilot valve core 3 through a groove between the two. This allows the third liquid chamber 95 formed between the armature 93 and the magnetic core tube assembly 91 to communicate with the drain port 13. When the electromagnetic coil 92 is energized, the armature 93 can quickly pull the pilot valve core 3; when the electromagnetic coil 92 is de-energized, the armature 93 can quickly drive the pilot valve core 3 to reset, improving the response time of the bidirectional shut-off reversing valve. The drain port 13 of the bidirectional shut-off reversing valve can be normally connected to an external oil tank, thus keeping the pressure in the third liquid chamber 95 formed between the magnetic core tube assembly 91 and the armature 93 relatively low.

[0048] like Figure 8 As shown, the magnetic core tube assembly 91 may include a core tube seat 911, a sleeve 912, a magnetic plug 913, and an optional nut 914 connected in sequence. The outer end face of the core tube seat 911 is connected to the first valve sleeve 1, and the inner end face of the core tube seat 911 is connected to the second valve sleeve 4. The sleeve 912 and the core tube seat 911 can be welded together, and the magnetic plug 913 and the sleeve 912 can also be welded together. An electromagnetic coil 92 is sleeved on the sleeve 912. The end of the elastic member 94 away from the armature 93 abuts against the magnetic plug 913. The nut 914 can be sleeved on the magnetic plug 913 to fix the electromagnetic coil 92.

[0049] like Figure 6 and Figure 9 The working principle of the bidirectional shut-off valve in the illustrated embodiment is as follows:

[0050] Electromagnetic coil 92 de-energized:

[0051] Operating Condition 1: Liquid enters the bidirectional shut-off valve from the first valve port 11, opens the first ball 24 at the connection between the first and third valve ports 23 through the first liquid port 21, enters the third liquid port 23, and then enters the first liquid chamber 42 through the fourth liquid port 41. Since the electromagnetic coil 92 is de-energized, the pilot valve core 3 will not slide under the drive of the armature 93, and the drain port 13 and the pressure relief channel are in a shut-off state. At the same time, the pressure acts on the second ball 25, preventing the liquid from flowing to the second valve port 12 through the second ball 25. Since the main valve core 2 is movably disposed in the first valve sleeve 1, the liquid may flow to the second valve port 12 through the gap 27 between the main valve core 2 and the first valve sleeve 1. That is, in Operating Condition 1, the first valve port 11 and the second valve port 12 are sealed by a spool valve, and only a very small amount of oil passes through.

[0052] Operating Condition 2: Liquid enters the bidirectional shut-off valve from the second valve port 12, opens the second ball 25 at the connection between the second and third liquid ports 22 through the second liquid port 22, enters the third liquid port 23, and then enters the first liquid chamber 42 through the fourth liquid port 41. Since the electromagnetic coil 92 is de-energized, the pilot valve core 3 will not slide under the drive of the armature 93, and the drain port 13 and the pressure relief channel are in a shut-off state. At the same time, the pressure acts on the first ball 24, causing the first valve port 11 to be ball-sealed, and the liquid entering from the second valve port 12 will not exit from the first valve port 11.

[0053] When the electromagnetic coil 92 is energized, the armature 93 moves toward the compression spring, i.e., the elastic element 94, which drives the pilot valve core 3 to move, thereby connecting the drain port 13 with the pressure relief channel.

[0054] Operating Condition 3: Liquid enters from the first valve port 11, opens the first ball bearing 24 at the connection between the first and third liquid ports 23 through the first liquid port 21, enters the third liquid port 23, and then enters the first liquid chamber 42 through the fourth liquid port 41. Since the pressure relief port is connected to the pressure relief channel, a pressure difference will be established at the first liquid port 21 when the liquid enters, making the pressure in the second liquid chamber 14 lower than the pressure at the first liquid port 21. Therefore, the main valve core 2 will move in the opposite direction to the reset force provided by the reset element 8 under the action of pressure, until it reaches the second liquid chamber 14. When the valve sleeves 4 abut against each other, the first valve port 11 and the second valve port 12 are directly connected, allowing liquid to flow in from the first valve port 11 and out from the second valve port 12. If the electromagnetic coil 92 is de-energized at this time, the armature 93 will drive the pilot valve core 3 to reset under the action of the elastic element 94, closing the connection between the drain port 13 and the pressure relief channel. The pressure difference between the second liquid chamber 14 and the first liquid port 21 will decrease, allowing the main valve core 2 to reset under the action of the reset force provided by the reset element 8, closing the connection between the first valve port 11 and the second valve port 12.

[0055] Operating Condition 4: Liquid enters from the second valve port 12, opens the second ball bearing 25 at the connection between the second and third liquid ports 22 through the second liquid port 22, enters the third liquid port 23, and then enters the first liquid chamber 42 through the fourth liquid port 41. Since the pressure relief port is connected to the pressure relief channel, a pressure difference will be established at the second liquid port 22 when the liquid enters, making the pressure in the second liquid chamber 14 lower than the pressure at the second liquid port 22. Therefore, the main valve core 2 will move in the opposite direction to the reset force provided by the reset element 8 under the action of pressure, until it reaches the second... When the valve sleeves 4 abut against each other, the first valve port 11 and the second valve port 12 are directly connected, allowing liquid to flow in from the second valve port 12 and out from the first valve port 11. If the electromagnetic coil 92 is de-energized at this time, the armature 93 will drive the pilot valve core 3 to reset under the action of the elastic element 94, closing the connection between the drain port 13 and the pressure relief channel. The pressure difference between the second liquid chamber 14 and the second liquid port 22 will decrease, allowing the main valve core 2 to reset under the action of the reset force provided by the reset element 8, closing the connection between the first valve port 11 and the second valve port 12.

[0056] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A bidirectional blocking commutated valve pressure relief structure, characterized by, include: The first valve sleeve (1) has a first valve port (11), a second valve port (12) and a drain port (13) formed thereon. A main valve core (2) and a pilot valve core (3) are movably disposed within the first valve sleeve (1). The main valve core (2) is provided with a first liquid passage that is connected to the first valve port (11) and the second valve port (12) respectively. The second valve sleeve (4) is disposed between the main valve core (2) and the pilot valve core (3). The second valve sleeve (4) has a pressure relief channel communicating with the first liquid channel. The pilot valve core (3) is slidably connected to the second valve sleeve (4). The pilot valve core (3) slides along the second valve sleeve (4) to realize the connection or cut-off of the drain port (13) and the pressure relief channel.

2. The bidirectional blocking commutated valve pressure relief structure of claim 1, wherein, The first liquid channel includes a first liquid port (21) connected to the first valve port (11), a second liquid port (22) connected to the second valve port (12), and a third liquid port (23) connected to the first liquid port (21) and the second liquid port (22). The connection points of the first liquid port (21), the second liquid port (22), and the third liquid port (23) are respectively provided with a first ball (24) and a second ball (25). The third liquid port (23) is also provided with a retaining ring (26) for limiting the first ball (24) and the second ball (25). The side of the third liquid port (23) away from the connection point is connected to the pressure relief channel.

3. The bidirectional blocking commutated valve pressure relief structure of claim 1, wherein, The pressure relief channel includes a fourth liquid port (41), a first liquid chamber (42), and a fifth liquid port (43) that are connected. The fourth liquid port (41) is connected to the first liquid channel. The first liquid chamber (42) has a sixth liquid port (44) connected to the fourth liquid port (41) and a seventh liquid port (45) that is wedge-shaped and fits with the pilot valve core (3) at both ends. The fifth liquid port (43) is connected to the drain port (13).

4. The bidirectional blocking commutated valve pressure relief structure of claim 3, wherein, The second valve sleeve (4) is also provided with a liquid passage groove (46) connected to the fourth liquid port (41), and the liquid inlet cross-sectional dimension of the liquid passage groove (46) is larger than the cross-sectional dimension of the fourth liquid port (41).

5. The bidirectional blocking commutated valve pressure relief structure of claim 1, wherein, The main valve core (2) is a cone valve core. The first valve port (11) and the second valve port (12) are connected by a conical surface (15) inside the first valve sleeve (1). A reset member (8) is installed on the second valve sleeve (4). The reset member (8) is used to provide a reset force for the cone valve core so that the cone valve core abuts against the conical surface (15).

6. The bidirectional blocking commutated valve pressure relief structure of claim 1, wherein, The second valve sleeve (4) is provided with a sealing element (6), and the sealing element (6) is provided with a groove (61) suitable for the pilot valve core (3) to extend into. The pilot valve core (3) is also provided with a second liquid channel (31). One side of the second liquid channel (31) is connected to the drain port (13), and the other side of the second liquid channel (31) is connected to the groove (61). A sealing ring (7) is provided between the groove (61) and the second valve sleeve (4).

7. A bidirectional blocking commutated valve characterized by include: The bidirectional shut-off reversing valve pressure relief structure according to any one of claims 1-6; The driving member (9) disposed on the first valve sleeve (1) is used to drive the pilot valve core (3) to slide in the second valve sleeve (4) so ​​that the pilot valve core (3) and the second valve sleeve (4) are in clearance fit or tight fit.

8. A bidirectional blocking commutated valve according to claim 7, characterized in that The drive unit (9) includes a magnetic core tube assembly (91) mounted on the first valve sleeve (1) and an electromagnetic coil (92) sleeved on the magnetic core tube assembly (91). The magnetic core tube assembly (91) is provided with an armature (93) and an elastic element (94). One end of the armature (93) is connected to the pilot valve core (3), and the other end of the armature (93) is connected to the elastic element (94), so that the armature (93) moves along the sliding direction of the pilot valve core (3) through the elastic element (94).

9. The bidirectional shut-off valve according to claim 8, characterized in that, The magnetic core tube assembly (91) includes a core tube seat (911), a sleeve (912), and a magnetic plug (913) connected in sequence. The outer end face of the core tube seat (911) is connected to the first valve sleeve (1), and the inner end face of the core tube seat (911) is connected to the second valve sleeve (4). The electromagnetic coil (92) is sleeved on the sleeve (912), and the end of the elastic member (94) away from the armature (93) abuts against the magnetic plug (913).

10. The bidirectional blocking commutated valve of claim 8, wherein, The armature (93) is a hollow structure. The armature (93) and the pilot valve core (3) are movably connected through the groove between them, and the third liquid cavity (95) formed between the armature (93) and the magnetic core tube assembly (91) is connected to the drain port (13).

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