Valve bank and balance valve

Abstract

The utility model relates to the technical field of valves, in particular to a valve bank and a balance valve. The valve group comprises a valve block and a balance valve, at least two valve cavities are formed in the valve block, a communicating cavity is formed between the two valve cavities in a communicating mode, the valve block is further provided with an oil port communicating with the valve cavities, the balance valve is installed in at least one valve cavity and comprises a valve element and a first one-way valve assembly, and an oil passing channel is formed in the valve element; the oil passing channel can enable the oil port to be communicated with the communicating cavity, at least part of the first one-way valve assembly is installed in the oil passing channel, the first one-way valve assembly can enable the communicating cavity to be unidirectionally cut off from the oil port, a sliding valve element in the communicating cavity is omitted, the requirements for roughness and cylindricity of the inner wall of the communicating cavity in the valve block are lowered, and the machining difficulty of the communicating cavity is lowered.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve assembly and a balancing valve. Background Technology

[0002] In the hydraulic transmission systems of engineering machinery, construction machinery, and other mechanical equipment, balance valves are typically used for hydraulic locking to ensure that the boom can reliably stop at any position. Because the load on a hybrid boom aerial work platform undergoes positive and negative reversals during the boom lifting process as the luffing angle changes, a two-way balance valve is used to prevent cylinder stall or overspeed during rotation, resulting in smoother cylinder operation.

[0003] like Figure 1 As shown, in the prior art, valve assembly 100 ， Including valve block 10 ， and installed on valve block 10 ， Balance valve, valve block 10 ， It has channels and connecting cavities 12 ， , connecting cavity 12 ， Enables the balance valve to communicate with other valve components, communication chamber 12 ， It is equipped with a slide valve core 36 ， Valve assembly 100 ， Including the first working state, in the first working state, the spool valve 36 ， Capable of sealing the connecting cavity 12 ， The above-described flow path configuration for the channel presents the following problems:

[0004] 36 spool valve ， and connecting cavity 12 ， The inner walls are fitted with a clearance fit for the communicating cavity 12. ， The requirements for the roughness and cylindricity of the inner wall are very high, which makes the machining of the connecting cavity 12' very difficult.

[0005] Therefore, there is an urgent need for a valve assembly and a balancing valve to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a valve assembly and a balancing valve, which eliminates the spool valve core and the connecting cavity located inside the valve block, thereby reducing the processing difficulty of the connecting cavity.

[0007] To achieve the above objectives, the following technical solution is provided:

[0008] A valve assembly, comprising:

[0009] A valve block, wherein at least two valve chambers are provided inside the valve block, and a connecting chamber is provided between the two valve chambers; the valve block is also provided with an oil port communicating with the valve chambers.

[0010] A balancing valve is installed in at least one of the valve chambers. The balancing valve includes a valve core and a first one-way valve assembly. The valve core has an oil passage that allows the oil port and the connecting chamber to communicate. At least a portion of the first one-way valve assembly is installed in the oil passage and allows the connecting chamber to be closed in one direction to the oil port.

[0011] As an optional solution, the first one-way valve assembly includes:

[0012] A one-way valve seat, wherein the end of the oil passage near the communicating cavity is a large-diameter end, at least a portion of the one-way valve seat is installed on the large-diameter end, the one-way valve seat is threaded or snapped into the valve core, and the one-way valve seat is provided with a communicating oil passage.

[0013] A first one-way valve core is movably disposed in the communicating oil passage. The balance valve includes a first state in which the first one-way valve core abuts against the wall of the oil passage near the large-diameter end to block the communicating cavity to the oil port.

[0014] As an optional solution, the oil passage has a sealing wall extending from the oil port to the communicating cavity. The channel formed by the sealing wall is flared, and the first one-way valve core is spherical. In the first state, the first one-way valve core abuts against the sealing wall.

[0015] As an optional solution, the one-way valve seat is threadedly connected to the valve core, and the one-way valve seat has an installation cavity on the side facing the communicating cavity, the cross-section of the installation cavity being polygonal.

[0016] As an optional solution, a sealing part is also included, which is sleeved on one end of the valve core near the communicating cavity. Along the radial direction of the valve core, one side of the sealing part abuts against the wall of the valve cavity, and the other side of the sealing part abuts against the outer wall of the valve core.

[0017] Alternatively, the balancing valve includes a valve seat assembly, the valve seat assembly comprising:

[0018] The main valve seat is mounted on the valve block;

[0019] Pressure regulating elastic element;

[0020] A spring seat is disposed inside the main valve seat, one end of the pressure regulating elastic element abuts against the spring seat, and the other end abuts against the valve core.

[0021] Alternatively, the balancing valve includes a second check valve assembly, which includes:

[0022] The second one-way valve core is movably disposed in the valve cavity and sleeved on the outer periphery of the valve core. The second one-way valve core can abut against the main valve seat to form a valve port.

[0023] One-way valve elastic element;

[0024] A gasket is fitted around the outer periphery of the valve core and abuts against the stepped surface of the inner wall of the valve cavity. The one-way valve elastic element is fitted around the outer periphery of the valve core. One end of the one-way valve elastic element abuts against the second one-way valve core, and the other end abuts against the gasket.

[0025] The oil port includes a C1 oil port and a V1 oil port. The first one-way valve assembly is located between the C1 oil port and the communicating cavity, and the valve port is located between the C1 oil port and the V1 oil port.

[0026] As an optional solution, the valve chamber is provided with an oil port C connected to the oil cylinder, and the gasket is located on the side of the oil port C away from the communicating cavity.

[0027] A balancing valve includes a valve core and a first one-way valve assembly. The valve core has an oil passage, and at least a portion of the first one-way valve assembly is installed in the oil passage. The first one-way valve assembly can cause the oil passage to be closed in one direction.

[0028] Alternatively, the balancing valve may further include a valve seat assembly, the valve seat assembly comprising:

[0029] Main valve seat;

[0030] Pressure regulating elastic element;

[0031] A spring seat is disposed inside the main valve seat, one end of the pressure regulating elastic element abuts against the spring seat, and the other end abuts against the valve core.

[0032] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0033] The valve assembly provided by this utility model has at least a portion of the first one-way valve assembly installed in the oil passage. The first one-way valve assembly can cut off the connection between the cavity and the oil port in one direction. The first one-way valve assembly realizes the function of the slide valve core in the prior art. Therefore, the slide valve core can be eliminated in the connection cavity, reducing the requirements for the roughness and cylindricity of the inner wall of the connection cavity and reducing the processing difficulty of the connection cavity; and it can prevent leakage between the V1 oil port and the V2 oil port.

[0034] The balance valve provided by this utility model has at least a portion of the first one-way valve assembly installed in the oil passage. The first one-way valve assembly can cut off the connection from the connecting cavity to the oil port in one direction. The first one-way valve assembly realizes the function of the slide valve core in the prior art. Therefore, when installing this balance valve, there is no need to process the connecting cavity for installing the slide valve core, which reduces the processing difficulty. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0036] Figure 1 A cross-sectional view of a bidirectional balancing valve in the prior art;

[0037] Figure 2 This is a cross-sectional view of the valve assembly provided in Embodiment 1 of this utility model;

[0038] Figure 3 This is a cross-sectional view of the valve assembly structure provided in Embodiment 1 of this utility model;

[0039] Figure 4 A cross-sectional view of the first one-way valve assembly provided in Embodiment 1 of this utility model;

[0040] Figure 5 The hydraulic schematic diagram of the valve assembly provided in Embodiment 1 of this utility model.

[0041] Figure label:

[0042] 100 ， Valve assembly;

[0043] 10 ， 12 valve blocks; ， , connecting cavity; 36 ， , slide valve core;

[0044] 100. Valve assembly;

[0045] 10. Valve block; 11. Valve chamber; 12. Connecting chamber; 13. V1 oil port; 14. C1 oil port; 15. V2 oil port; 16. C2 oil port;

[0046] 20. First check valve assembly; 21. Check valve seat; 2101. Check valve chamber; 2102. Mounting chamber; 211. Spacing part; 2111. Communicating hole; 22. First check valve core;

[0047] 30. Valve seat assembly; 31. Valve core; 311. Oil passage; 32. Main valve seat; 321. First opening; 322. Second opening; 33. Pressure adjusting elastic element; 34. Spring seat; 35. Locking nut; 36. Adjusting rod;

[0048] 40. Second check valve assembly; 41. Second check valve core; 42. Check valve elastic element; 43. Gasket;

[0049] 50. Sealing section. Detailed Implementation

[0050] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0051] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0052] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0056] Example 1

[0057] like Figure 2 and Figure 3 As shown, this embodiment provides a valve assembly 100, which includes a valve block 10 and a balance valve. The valve block 10 has at least two valve chambers 11, and a connecting chamber 12 is provided between the two valve chambers 11. The valve block 10 is also provided with oil ports that communicate with the valve chambers 11. The balance valve is installed in at least one valve chamber 11. The oil ports include a V oil port for connecting to a system pipeline and a C oil port for connecting to a hydraulic cylinder. In this embodiment, the oil ports that communicate with the left valve chamber 11 are designated as V1 oil port 13 and C1 oil port 14, and the oil ports that communicate with the right valve chamber 11 are designated as V2 oil port 15 and C2 oil port 16.

[0058] It should be noted that the "left" and "right" mentioned in this embodiment do not refer to the spatial meaning of "left" and "right" in the actual application of the valve assembly 100; they are used only for reference. Figure 2 The view orientation is merely used to distinguish different features and should not be construed as a limitation on the technical solution of this application.

[0059] The balancing valve includes a valve seat assembly 30, which includes a main valve seat 32, a spring seat 34, a valve core 31, and a pressure regulating elastic element 33. The main valve seat 32 is mounted on the valve block 10, and at least a portion of the main valve seat 32 extends into the valve cavity 11. The spring seat 34 is disposed within the main valve seat 32. One end of the pressure regulating elastic element 33 abuts against the spring seat 34, and the other end abuts against the valve core 31. The valve core 31 has an oil passage 311 extending axially within it. The pressure regulating elastic element 33 can be a spring, which has a simple structure, low price, and low operating cost.

[0060] Optionally, the side of the spring seat 34 facing away from the pressure regulating elastic element 33 is an arc-shaped surface, so that the pressure regulating elastic element 33 can be self-centered and avoids whistling, shaking and other situations during operation.

[0061] The valve seat assembly 30 also includes an adjusting rod 36 and a locking nut 35. The adjusting rod 36 passes through the main valve seat 32, and one end of the adjusting rod 36 that passes through the main valve seat 32 abuts against the spring seat 34. The locking nut 35 is threaded to the adjusting rod 36 and abuts against the outer wall of the main valve seat 32. By adjusting how much the locking nut 35 is screwed into the adjusting rod 36, the preload of the pressure regulating elastic element 33 is adjusted. The adjustment method is simple and quick.

[0062] The balance valve also includes a second one-way valve assembly 40, which includes a second one-way valve core 41, a one-way valve elastic element 42, and a gasket 43. The second one-way valve core 41 is movably disposed within the valve cavity 11 and sleeved on the outer periphery of the valve core 31. The second one-way valve core 41 can abut against the main valve seat 32 to form a valve port, which is located between the C1 oil port 14 and the V1 oil port 13. The gasket 43 is sleeved on the outer periphery of the valve core 31 and abuts against the stepped surface of the inner wall of the valve cavity 11. The one-way valve elastic element 42 is sleeved on the outer periphery of the valve core 31, with one end abutting against the second one-way valve core 41 and the other end abutting against the gasket 43. The one-way valve elastic element 42 can be a spring, which has a simple structure and low operating cost.

[0063] Optionally, the gasket 43 is located on the side of port C away from the connecting cavity 12, meaning that port C will not be blocked by the one-way valve elastic element 42, in order to reduce the impact of additional pressure differential.

[0064] The main valve seat 32 has a first opening 321 and a second opening 322. The first opening 321 and the second opening 322 are respectively connected to the V oil port. The second one-way valve core 41 can selectively block the valve cavity 11 between the first opening 321 and the valve core 31. The second opening 322 is connected to the valve cavity 11 between the spring seat 34 and the valve core 31.

[0065] The valve assembly 100 also includes a first check valve assembly 20, which is located between the C1 port 14 and the connecting cavity 12. The oil passage 311 enables the port and the connecting cavity 12 to be connected. At least a portion of the first check valve assembly 20 is installed in the oil passage 311. The first check valve assembly 20 enables the connecting cavity 12 to be cut off from the port in one direction. The first check valve assembly 20 realizes the function of the spool valve in the prior art. Therefore, the spool valve can be eliminated in the connecting cavity 12, reducing the requirements for the roughness and cylindricity of the inner wall of the connecting cavity 12 and reducing the machining difficulty of the connecting cavity 12.

[0066] Specifically, such as Figures 2-4 As shown, the first one-way valve assembly 20 includes a one-way valve seat 21 and a first one-way valve core 22. The end of the oil passage 311 near the connecting cavity 12 is the large-diameter end. At least a portion of the one-way valve seat 21 is installed at the large-diameter end of the oil passage 311. The one-way valve seat 21 is threaded or snapped into the valve core 31. The one-way valve seat 21 is provided with a through oil passage. The first one-way valve core 22 is movably disposed in the through oil passage. The balance valve includes a first state in which the first one-way valve core 22 abuts against the wall of the oil passage 311 near the large-diameter end to block it. The medium flows from the connecting cavity 12 to the oil port. In the first state, the first check valve core 22 blocks the oil passage 311 under the impact of the medium. In the second state, the first check valve core 22 moves closer to the connecting cavity 12, allowing the medium to flow into the connecting cavity 12 through the connecting hole 2111. Thus, the first check valve core 22 can unidirectionally cut off the medium from the connecting cavity 12 to the oil port. The medium can be hydraulic oil.

[0067] Optionally, the connecting oil passage includes a one-way valve chamber 2101. The one-way valve seat 21 is recessed inward at one end axially away from the connecting chamber 12 to form the one-way valve chamber 2101. The first one-way valve core 22 is disposed in the one-way valve chamber 2101 to limit the first one-way valve core 22 and prevent the first one-way valve core 22 from moving under the impact of the medium.

[0068] In this embodiment, the one-way valve seat 21 and the valve core 31 are threaded together, providing a secure connection and facilitating assembly and disassembly. In other embodiments, the one-way valve seat 21 and the valve core 31 can also be connected by a plug-in or snap-fit ​​connection.

[0069] Furthermore, the connecting oil passage also includes a mounting cavity 2102. The end of the one-way valve seat 21 axially facing the connecting cavity 12 is recessed inward to form the mounting cavity 2102. The mounting cavity 2102 has a polygonal cross-section to facilitate the insertion of an installation tool into the mounting cavity 2102 to apply torque to the one-way valve seat 21 and screw the one-way valve seat 21 onto the valve core 31. In this embodiment, the mounting cavity 2102 has a regular hexagonal cross-section to facilitate the installation of the one-way valve seat 21 using a standard hex screwdriver, avoiding the need for separately machining installation tools and helping to reduce costs.

[0070] Optionally, a spacer 211 is provided between the mounting cavity 2102 and the check valve cavity 2101. The spacer 211 is provided with a connecting hole 2111 that connects the mounting cavity 2102 and the check valve cavity 2101. The mounting cavity 2102, the connecting hole 2111 and the check valve cavity 2101 together form the aforementioned connecting oil passage, and the spacer 211 separates the mounting cavity 2102 and the check valve cavity 2101.

[0071] Optionally, the oil passage 311 has a sealing wall extending from the oil port to the connecting cavity 12. The passage formed by the sealing wall is flared. In the first state, the first one-way valve core 22 abuts against the sealing wall. In the second state, the first one-way valve core 22 disengages from the sealing wall, so that the medium flows more smoothly from the mounting cavity 2102 to the connecting cavity 12, which helps to reduce turbulence.

[0072] Optionally, the first one-way valve core 22 is spherical, which has low resistance to the flow of the medium and good sealing between the first one-way valve core 22 and the valve core 31.

[0073] Optionally, the valve assembly 100 further includes a sealing portion 50, which is sleeved on the end of the valve core 31 near the communicating cavity 12. Along the radial direction of the valve core 31, one side of the sealing portion 50 abuts against the wall of the valve cavity 11, and the other side of the sealing portion 50 abuts against the outer wall of the valve core 31, so as to improve the sealing performance between the valve core 31 and the valve cavity 11. Specifically, the sealing portion 50 can be an O-ring.

[0074] For ease of understanding, combined with Figures 2-5 The working process of valve assembly 100 is explained as follows:

[0075] Taking the C2 port 16 connecting to the rod chamber of the cylinder and the C1 port 14 connecting to the rodless chamber of the cylinder as an example, when oil enters through the V1 port 13, the hydraulic oil is divided into two paths. One path of hydraulic oil enters the valve chamber 11 between the spring seat 34 and the valve core 31 through the second opening 322, and then enters the connecting chamber 12 through the oil passage 311, the one-way valve chamber 2101, the connecting hole 2111, and the mounting chamber 2102. Since the first one-way valve core 22 on the right side blocks the oil passage 311 on the right side, when the oil pressure reaches the set pressure, it overcomes the elastic force of the pressure regulating elastic element 33 on the right side and pushes the valve core 31 on the right side and the second one-way valve core 41 to move to the right together. When the second one-way valve core 41 on the right side abuts against the main valve seat 32 on the right side, the main valve seat 32 prevents the second one-way valve core 41 on the right side from moving to the right. As the valve core 41 continues to move to the right, and the oil pressure continues to rise, the valve core 31 on the right side continues to move to the right and separates from the valve core 31 and the second one-way valve core 41. At this time, the valve chamber 11 on the right side is connected to the first opening 321, so that the C2 oil port 16 and V2 oil port 15 on the right side are connected. Then, the hydraulic oil in the rod chamber of the cylinder enters the right valve chamber 11 through the C2 oil port 16 and flows out from the V2 oil port 15 through the first opening 321. Another path of hydraulic oil acts on the left end of the second one-way valve core 41 on the left side through the first opening 321, pushing the second one-way valve core 41 to move to the right and separate from the valve core 31 on the left side. Then, the V1 oil port 13 and the C1 oil port 14 are connected, and the hydraulic oil enters the rodless chamber of the cylinder through the C1 oil port 14.

[0076] Conversely, when oil enters through the V2 port 15, one path of hydraulic oil enters the valve chamber 11 between the right spring seat 34 and the valve core 31 through the right second opening 322. Then, it passes through the oil passage 311, the one-way valve chamber 2101, the connecting hole 2111, the mounting chamber 2102, and the connecting chamber 12, pushing the left valve core 31 to the left. This causes the valve core 31 in the left valve chamber 11 to disengage from the second one-way valve core 41, and the C1 port 14 and V1 port 13 become connected. As a result, the hydraulic oil in the rodless chamber of the cylinder flows out through the C1 port 14 and the V1 port 13. Another path of hydraulic oil passes through the right first opening 321 and directly pushes the right second one-way valve core 41 to the left. The C2 port 16 and V2 port 15 become connected, and the hydraulic oil enters the rod chamber of the cylinder through the C2 port.

[0077] This cycle repeats, allowing the piston rod of the hydraulic cylinder to move left and right or up and down to perform the required actions. When both oil ports V1 (13) and V2 (15) are simultaneously cut off, the hydraulic cylinder can be locked, keeping the load stable. By implementing linkage control between the two chambers of the hydraulic cylinder through the valve assembly 100, the oil inlet and outlet of the two chambers can always be kept in a balanced state, ensuring smooth operation of the actuator carried by the hydraulic cylinder.

[0078] Example 2

[0079] This embodiment provides a balancing valve installed in the valve assembly 100 provided in Embodiment 1. The valve assembly 100 has a connecting cavity 12 and an oil port. The oil port includes a V oil port for connection to a system pipeline, and the V oil port includes a V1 oil port 13 and a V2 oil port 15. The balancing valve includes a valve core 31 and a first one-way valve assembly 20. The valve core 31 has an oil passage 311 extending axially within it, which allows the oil port and the connecting cavity 12 to be connected. At least a portion of the first one-way valve assembly 20 is installed in the oil passage 311, and the first one-way valve assembly 20 can unidirectionally cut off the connection between the connecting cavity 12 and the oil port. The first one-way valve assembly realizes the function of the spool valve in the prior art, so the spool valve can be eliminated in the connecting cavity 12, reducing the requirements for the roughness and cylindricity of the inner wall of the connecting cavity, reducing the machining difficulty of the connecting cavity 12; and preventing leakage between the V1 oil port 13 and the V2 oil port 15.

[0080] The balancing valve also includes a valve seat assembly 30, which includes a main valve seat 32, a pressure regulating elastic element 33, and a spring seat 34. The main valve seat 32 is disposed within the valve assembly 100, and the spring seat 34 is disposed within the main valve seat 32. One end of the pressure regulating elastic element 33 abuts against the spring seat 34, and the other end abuts against the valve core 31. The pressure regulating elastic element 33 can be a spring, which has a simple structure, low price, and low operating cost.

[0081] The balancing valve also includes a second check valve assembly 40, which includes a second check valve core 41, a check valve elastic element 42, and a gasket 43. The second check valve core 41 is movably disposed within the valve cavity 11 and sleeved on the outer periphery of the valve core 31, and can abut against the main valve seat 32. The gasket 43 is sleeved on the outer periphery of the valve core 31 and abuts against the stepped surface of the inner wall of the valve cavity 11. The check valve elastic element 42 is sleeved on the outer periphery of the valve core 31, with one end abutting against the second check valve core 41 and the other end abutting against the gasket 43. The check valve elastic element 42 can be a spring, which has a simple structure and low operating cost.

[0082] Optionally, the oil port includes a C port for connection with the oil cylinder, and the gasket 43 is located on the side of the C port away from the connecting cavity 12, that is, the C port will not be blocked by the one-way valve elastic element 42, so as to reduce the influence of additional pressure difference.

[0083] The main valve seat 32 has a first opening 321 and a second opening 322. The first opening 321 and the second opening 322 are respectively connected to the V oil port. The second one-way valve core 41 can selectively block the valve cavity 11 between the first opening 321 and the valve core 31. The second opening 322 is connected to the valve cavity 11 between the spring seat 34 and the valve core 31.

[0084] The first one-way valve assembly 20 includes a one-way valve seat 21 and a first one-way valve core 22. The end of the oil passage 311 near the connecting cavity 12 is the large-diameter end. At least a portion of the one-way valve seat 21 is installed at the large-diameter end of the oil passage 311. The one-way valve seat 21 is threaded or snap-fitted to the valve core 31. The one-way valve seat 21 has a through-hole oil passage. The first one-way valve core 22 is movably disposed in the connecting oil passage. The balance valve includes a first state in which the first one-way valve core 22 abuts against the wall of the oil passage 311 near the large-diameter end to block the connection. From cavity 12 to the oil port, when the medium flows from the connecting cavity 12 to the oil passage 311, that is, in the first state of the balance valve, the first one-way valve core 22 blocks the oil passage 311 under the impact of the medium. When the medium flows from the oil passage 311 to the connecting cavity 12, that is, in the second state of the balance valve, the first one-way valve core 22 moves towards the connecting cavity 12, at which time the medium flows into the connecting cavity 12 through the connecting hole 2111; thus, the first one-way valve core 22 can make the medium flow from the connecting cavity 12 to the oil port in one direction only. The medium can be hydraulic oil.

[0085] Optionally, the connecting oil passage includes a one-way valve chamber 2101. The one-way valve seat 21 is recessed inward at one end axially away from the connecting chamber 12 to form the one-way valve chamber 2101. The first one-way valve core 22 is disposed in the one-way valve chamber 2101 to limit the first one-way valve core 22 and prevent the first one-way valve core 22 from moving under the impact of the medium.

[0086] In this embodiment, the one-way valve seat 21 and the valve core 31 are threaded together, providing a secure connection and facilitating assembly and disassembly. In other embodiments, the one-way valve seat 21 and the valve core 31 can also be connected by a plug-in or snap-fit ​​connection.

[0087] Optionally, the one-way valve seat 21 and the valve core 31 are threaded together, providing a secure connection and facilitating assembly and disassembly. In other embodiments, the one-way valve seat 21 and the valve core 31 can also be connected by a plug-in or snap-fit ​​connection.

[0088] Furthermore, the connecting oil passage also includes a mounting cavity 2102. The end of the one-way valve seat 21 axially facing the connecting cavity 12 is recessed inward to form the mounting cavity 2102. The mounting cavity 2102 has a polygonal cross-section to facilitate the insertion of an installation tool into the mounting cavity 2102 to apply torque to the one-way valve seat 21 and screw the one-way valve seat 21 onto the valve core 31. In this embodiment, the mounting cavity 2102 has a regular hexagonal cross-section to facilitate the installation of the one-way valve seat 21 using a standard hex screwdriver, avoiding the need for separately machining installation tools and helping to reduce costs.

[0089] Optionally, a spacer 211 is provided between the mounting cavity 2102 and the check valve cavity 2101. The spacer 211 is provided with a connecting hole 2111 that connects the mounting cavity 2102 and the check valve cavity 2101. The mounting cavity 2102, the connecting hole 2111 and the check valve cavity 2101 together form the aforementioned connecting oil passage, and the spacer 211 separates the mounting cavity 2102 and the check valve cavity 2101.

[0090] Optionally, the oil passage 311 has a sealing wall extending from the oil port to the connecting cavity 12. The passage formed by the sealing wall is flared. In the first state, the first one-way valve core 22 abuts against the sealing wall. In the second state, the first one-way valve core 22 disengages from the sealing wall, so that the medium flows more smoothly from the mounting cavity 2102 to the connecting cavity 12, which helps to reduce turbulence.

[0091] Optionally, the first one-way valve core 22 is spherical, which has low resistance to the flow of the medium and good sealing between the first one-way valve core 22 and the valve core 31.

[0092] Optionally, the balancing valve further includes a sealing part 50, which is sleeved on the end of the valve core 31 near the communicating cavity 12. Along the radial direction of the valve core 31, one side of the sealing part 50 abuts against the wall of the valve cavity 11, and the other side of the sealing part 50 abuts against the outer wall of the valve core 31, so as to improve the sealing performance between the valve core 31 and the valve cavity 11. Specifically, the sealing part 50 can be an O-ring.

[0093] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A valve block, characterized by, The application relates to a valve block (10) comprising at least two valve cavities (11) and a communication cavity (12) arranged between the two valve cavities (11), and an oil port communicated with the valve cavities (11); a balance valve installed in at least one of the valve cavities (11) and comprising a valve core (31) and a first one-way valve assembly (20), wherein the valve core (31) is provided with an oil passing channel (311) communicated with the oil port and the communication cavity (12), and the first one-way valve assembly (20) is installed in the oil passing channel (311) and can realize one-way cut-off of the communication cavity (12) to the oil port. The first one-way valve assembly (20) comprises a one-way valve seat (21) installed in a large-diameter end of the oil passing channel (311) near the communication cavity (12), and the one-way valve seat (21) is threadedly connected or clamped to the valve core (31) and is provided with a communication oil channel; and a first one-way valve core (22) movably arranged in the communication oil channel, wherein the balance valve comprises a first state, in which the first one-way valve core (22) abuts against a wall of the oil passing channel (311) near the large-diameter end to block the communication cavity (12) to the oil port. The oil passing channel (311) has a sealing wall, and the sealing wall forms an expanding channel from the oil port to the communication cavity (12), and the first one-way valve core (22) is spherical, and in the first state, the first one-way valve core (22) abuts against the sealing wall.

2. Valve group according to claim 1, characterized in that The one-way valve seat (21) is threadedly connected to the valve core (31), and the one-way valve seat (21) is provided with an installation cavity (2102) on a side facing the communication cavity (12), and the installation cavity (2102) has a polygonal cross section. The balance valve further comprises a sealing part (50) sleeved on an end of the valve core (31) near the communication cavity (12) and abutting against a wall of the valve cavity (11) on one side and abutting against an outer wall of the valve core (31) on the other side in the radial direction of the valve core (31). The balance valve comprises a valve seat assembly (30) comprising a main valve seat (32) arranged on the valve block (10), a pressure regulating elastic member (33), and a spring seat (34) arranged in the main valve seat (32) and abutting against one end of the pressure regulating elastic member (33) and the valve core (31) on the other end.

3. The valve group of claim 2, wherein, The balance valve further comprises a second one-way valve assembly (40) comprising a second one-way valve core (41) movably arranged in the valve cavity (11) and sleeved on an outer periphery of the valve core (31) and capable of abutting against the main valve seat (32) to form a valve port.

4. The valve group of claim 2, wherein ​ 5. Valve group according to any one of claims 1-4, characterized in that ​ 6. The valve group of claim 1, wherein ​ ​ ​ ​ 7. The valve group of claim 6, wherein ​ ​ The one-way valve elastic member (42); The gasket (43) is sleeved on the outer periphery of the valve core (31) and abuts against the stepped surface of the inner wall of the valve cavity (11), the one-way valve elastic member (42) is sleeved on the outer periphery of the valve core (31), one end of the one-way valve elastic member (42) abuts against the second one-way valve core (41), and the other end abuts against the gasket (43); The oil port comprises a C1 oil port (14) and a V1 oil port (13), the first one-way valve assembly (20) is located between the C1 oil port (14) and the communication cavity (12), and the valve port is located between the C1 oil port (14) and the V1 oil port (13).

8. The valve group of claim 7, wherein, The valve cavity (11) is provided with a C oil port connected with an oil cylinder, and the gasket (43) is arranged on the side, away from the communication cavity (12), of the C oil port.

9. A balanced valve characterized by The balance valve further comprises a valve core (31) and a first one-way valve assembly (20), the valve core (31) is provided with an oil passing channel (311) therein, at least part of the first one-way valve assembly (20) is mounted in the oil passing channel (311), and the first one-way valve assembly (20) can one-way cut off the oil passing channel (311).

10. Balanced valve according to claim 9, characterized in that The balance valve further comprises a valve seat assembly (30), the valve seat assembly (30) comprises: A main valve seat (32); A pressure regulating elastic member (33); A spring seat (34) is arranged in the main valve seat (32), one end of the pressure regulating elastic member (33) abuts against the spring seat (34), and the other end abuts against the valve core (31).

Images