A cartridge valve with speed control function

Abstract

This invention discloses a cartridge valve with speed control function, including a body, a cover, and a valve core. The valve core is reciprocating along the body. The cover has an oil control chamber, and the end of the valve core extends into the oil control chamber. The valve core has a first speed control hole, a first oil guide channel, and an oil guide groove. The first oil guide channel extends through both sides of the valve core, and the first speed control hole extends through the end of the valve core. The first oil guide channel and the oil control chamber are connected through the first speed control hole. The oil guide groove is located above the first oil guide channel and at the connection between the first oil guide channel and the side wall of the valve core. The oil control chamber has a protruding section facing the side wall of the valve core. This invention has the advantages of preventing hydraulic shock and ensuring the switching response speed of the cartridge valve.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a cartridge valve with speed regulation function. Background Technology

[0002] Cartridge valves are commonly used in hydraulic systems to control the pressure, direction, and flow of hydraulic fluid. Specifically, existing cartridge valves typically include a body, a cover, and a valve core. The valve core is located within the body and can reciprocate relative to the body. This allows the valve core to either approach and block the supply and outlet ports of the body for a sealing effect, or move away from the supply and outlet ports for a connecting effect. The control channel inside the cover is connected to the valve core. By increasing the oil pressure in the control channel to exceed the oil pressure in the supply port, the valve core moves downward to block all oil passages; or by decreasing the oil pressure in the control channel to decrease the oil pressure in the supply port, the valve core moves upward to move away from the supply and outlet ports, thus achieving the opening and closing function of the cartridge valve.

[0003] If the valve core moves too fast, the oil state in the supply and outlet ports will suddenly change the instant the valve core blocks or leaves them, causing hydraulic shock and hindering stable system operation. Therefore, most oil control channels are equipped with throttling elements, which have narrow-diameter speed-regulating orifices to control the flow rate of oil in the control channel, thereby controlling the opening and closing speed of the valve core.

[0004] However, this structural design slows down the overall opening and closing process of the valve core, which in turn affects the opening and closing response speed of the cartridge valve, resulting in less smooth operation of the hydraulic system and limiting the production potential of the equipment. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a cartridge valve with speed regulation function, which can prevent the generation of hydraulic shock and ensure the opening and closing response speed of the cartridge valve.

[0006] To solve the above technical problems, embodiments of the present invention provide a cartridge valve with speed regulation function, including a body, a cover connected to the body, and a valve core located in the body. The valve core is reciprocating along the body, and the cover is provided with an oil control chamber. The end of the valve core extends into the oil control chamber.

[0007] The valve core is provided with a first speed regulating hole, a first oil guiding channel and an oil guiding groove. The first oil guiding channel passes through both sides of the valve core, the first speed regulating hole passes through the end of the valve core, and the first oil guiding channel and the oil control chamber are connected through the first speed regulating hole.

[0008] The oil guide groove is located at the upper part of the first oil guide channel, and the oil guide groove is located at the connection between the first oil guide channel and the valve core sidewall;

[0009] The oil control chamber has a protruding section facing the side wall of the valve core. As the valve core moves, the protruding section abuts against the side wall of the valve core and gradually approaches the oil guide groove. A buffer space is separated between the protruding section and the oil guide groove so that the oil guide groove can gradually connect with the oil control chamber, thereby allowing the first oil guide channel to gradually connect with the oil control chamber through the oil guide groove.

[0010] Preferably, both the oil guide groove and the protruding section are arranged along the circumference of the valve core, and the protruding section seals the opening of the oil guide groove, with the buffer space separating the protruding section from the bottom of the oil guide groove.

[0011] Preferably, the valve core is further provided with a second speed regulating hole and a second oil guiding channel. The second oil guiding channel runs through both sides of the valve core and is located below the first oil guiding channel. The second oil guiding channel and the first oil guiding channel are connected through the second speed regulating hole.

[0012] Another oil guide groove is located at the upper part of the second oil guide channel, and another oil guide groove is located at the connection between the second oil guide channel and the valve core sidewall.

[0013] Preferably, the diameter of the first speed regulating hole is smaller than the diameter of the first oil guide channel and the diameter of the second oil guide channel, and the diameter of the second speed regulating hole is smaller than the diameter of the first oil guide channel and the diameter of the second oil guide channel.

[0014] Preferably, the cartridge valve with speed regulation function further includes an elastic element, the end of the valve core is provided with a first mounting groove, one end of the elastic element is connected to the first mounting groove; and the oil control chamber is provided with a second mounting groove opposite to the first mounting groove, the other end of the elastic element is connected to the second mounting groove;

[0015] The first speed regulating hole penetrates the bottom of the first mounting groove.

[0016] Preferably, the body is provided with a valve groove, an oil outlet hole penetrating the side wall of the valve groove, and an oil supply hole penetrating the bottom of the valve groove. The valve core is provided with a sealing part located in the valve groove. The sealing part is located below the first oil guide channel, and the sealing part can move along the valve groove to block or avoid the oil outlet hole and the oil supply hole.

[0017] The width of the sealing part is greater than the length of the first oil guiding channel.

[0018] Preferably, the cartridge valve with speed regulation function further includes a valve cup, which is located in the valve groove and is sleeved on the sealing part. The valve cup is provided with a first through hole communicating with the oil outlet and a second through hole communicating with the oil supply hole.

[0019] The sealing part can reciprocate along the valve cup.

[0020] Preferably, the valve core is further provided with a sliding part, the sliding part extends into the oil control chamber, and the sliding part and the sealing part are detachably connected, the width of the sliding part is less than or equal to the width of the sealing part;

[0021] The first oil guide channel extends through both sides of the sliding part, the first speed regulating hole extends through the end of the sliding part, and the oil guide groove is located at the connection between the first oil guide channel and the side wall of the sliding part.

[0022] Preferably, the cartridge valve with speed regulation function further includes a valve sleeve, the cover is connected to the valve cup through the valve sleeve, and both the sliding part and the sealing part are partially located inside the valve sleeve.

[0023] Preferably, the cartridge valve with speed regulation function further includes a control valve, an oil control channel communicating with the oil control chamber inside the cover, and the control valve being connected to the oil control channel;

[0024] Alternatively, the valve sleeve may have an oil control channel that communicates with the first oil guide channel, and the control valve may be connected to the oil control channel.

[0025] Implementing the embodiments of the present invention has the following beneficial effects:

[0026] In this embodiment of the invention, an oil control chamber is provided inside the cover, and the end of the valve core extends into the oil control chamber. By increasing the oil pressure in the oil control chamber, the valve core is pressed down to achieve a sealing effect, or by decreasing the oil pressure in the oil control chamber, the valve core is raised to ensure oil flow.

[0027] The valve core is provided with a first speed regulating hole, a first oil guiding channel and an oil guiding groove. The first oil guiding channel passes through both sides of the valve core, the first speed regulating hole passes through the end of the valve core, and the first oil guiding channel and the oil control cavity are connected through the first speed regulating hole. The oil control cavity is provided with a protruding section facing the side wall of the valve core, which plays a sealing role.

[0028] When the cartridge valve is first opened, the valve core moves upward and the protruding section abuts against the side wall of the valve core. This allows the oil in the first oil guide channel to flow into the oil control chamber only through the smaller diameter first speed regulating hole. This increases the resistance to the movement of the valve core and reduces the movement speed of the valve core, so as to slowly pass oil through the oil outlet and oil supply holes when the valve is first opened. This controls the initial opening speed of the cartridge valve and prevents the generation of oil pressure shock when the valve is opened.

[0029] Furthermore, the oil guide groove is located at the upper part of the first oil guide channel, and the oil guide groove is located at the connection between the first oil guide channel and the valve core sidewall. The protruding section moves closer to the oil guide groove as the valve core moves upward, and gradually avoids the groove opening of the oil guide groove, so that the oil guide groove can gradually connect with the oil control cavity, so that the first oil guide channel gradually connects with the oil control cavity through the oil guide groove, thereby allowing the oil in the first oil guide channel to flow smoothly into the oil control cavity, thereby increasing the oil flow rate of the oil outlet and oil supply holes, and increasing the movement speed of the valve core.

[0030] Furthermore, the valve core may be provided with a second speed regulating hole and a second oil guiding channel. The second oil guiding channel runs through both sides of the valve core and is located below the first oil guiding channel. The second oil guiding channel and the first oil guiding channel are connected through the second speed regulating hole. When the protruding section leaves the first oil guiding channel, the oil pressure difference between the second oil guiding channel and the oil control chamber gradually increases, thereby reducing the valve core movement speed again, so that the valve core opens to the correct position, and further preventing the generation of hydraulic shock. Attached Figure Description

[0031] Figure 1 This is a structural diagram of a cartridge valve with speed regulation function according to an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A magnified view of a portion at point A shown;

[0033] Figure 3 This is a diagram showing the operating state of the cartridge valve with speed regulation function of the present invention when it is opened;

[0034] Figure 4 This is a diagram showing the operating state of the cartridge valve with speed regulation function of the present invention when it is closed;

[0035] Figure 5 This is a structural diagram of a cartridge valve with speed regulation function according to another embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0037] Combination Figures 1 to 5 The present invention provides a cartridge valve with speed regulation function, including a body 1, a cover 2 connected to the body 1, and a valve core 3 located inside the body 1, the valve core 3 being able to reciprocate along the body 1.

[0038] In this embodiment of the invention, an oil control chamber 21 is provided inside the cover 2. The end of the valve core 3 extends into the oil control chamber 21. By increasing the oil pressure in the oil control chamber 21, the valve core 3 is pressed down to block the oil outlet 111 and the oil supply port 112, thereby achieving a blocking effect. Alternatively, by decreasing the oil pressure in the oil control chamber 21, the valve core 3 is raised to ensure that the oil outlet 111 and the oil supply port 112 remain in a connected state, thereby ensuring the oil flow effect.

[0039] The valve core 3 is provided with a first speed regulating hole 31, a first oil guiding channel 32 and an oil guiding groove 33. The first oil guiding channel 32 passes through both sides of the valve core 3, and the first speed regulating hole 31 passes through the end of the valve core 3. The first oil guiding channel 32 and the oil control cavity 21 are connected through the first speed regulating hole 31. The oil control cavity 21 is provided with a protruding section 211 facing the side wall of the valve core 3, which serves as a sealing function.

[0040] When the cartridge valve is first opened, the valve core 3 moves upward, and the protruding section 211 abuts against the side wall of the valve core 3. This causes the oil in the first oil guide channel 32 to flow into the oil control chamber 21 only through the smaller diameter first speed regulating hole 31. This increases the resistance to the movement of the valve core 3 and reduces the movement speed of the valve core 3. This allows for the slow flow of oil through the oil outlet hole 111 and the oil supply hole 112 when the valve is first opened, thereby controlling the initial opening speed of the cartridge valve and preventing the generation of oil pressure shock when the valve is opened.

[0041] Furthermore, the oil guide groove 33 is located on the upper part of the first oil guide channel 32, and the oil guide groove 33 is located at the connection between the first oil guide channel 32 and the side wall of the valve core 3. The protruding section 211 moves closer to the oil guide groove 33 as the valve core 3 moves upward, and gradually avoids the groove opening of the oil guide groove 33, so that the oil guide groove 33 can gradually connect with the oil control chamber 21, so that the first oil guide channel 32 gradually connects with the oil control chamber 21 through the oil guide groove 33, thereby allowing the oil in the first oil guide channel 32 to flow smoothly into the oil control chamber 21, thereby increasing the oil flow rate of the oil outlet 111 and the oil supply hole 112 by increasing the moving speed of the valve core 3.

[0042] Furthermore, the valve core 3 is also provided with a second speed regulating hole 34 and a second oil guiding channel 35. The second oil guiding channel 35 runs through both sides of the valve core 3 and is located below the first oil guiding channel 32. The second oil guiding channel 35 and the first oil guiding channel 32 are connected through the second speed regulating hole 34. When the protruding section 211 leaves the first oil guiding channel 32, the oil pressure difference between the second oil guiding channel 35 and the oil control chamber 21 gradually increases, thereby reducing the valve core movement speed again, so that the valve core opens to the correct position, and further preventing the generation of hydraulic shock.

[0043] Conversely, when the cartridge valve just enters the closed state from the open state, the oil in the oil control chamber 21 flows from the first speed regulating hole 31 and the oil guide groove 33 to the first oil guide channel 32. The oil pressure difference between the first oil guide channel 32 and the oil control chamber 21 is small, which causes the valve core 3 to move downward quickly, ensuring the initial closing speed of the cartridge valve.

[0044] Furthermore, as the valve core 3 moves, the protruding section 211 gradually moves away from the oil guide groove 33 and gradually comes into contact with the side wall of the valve core 3 to block it. This allows the oil in the oil control chamber 21 to flow only through the smaller diameter first speed regulating hole 31 into the first oil guide channel 32, resulting in an oil pressure difference between the first oil guide channel 32 and the oil control chamber 21. This causes the moving speed of the valve core 3 to gradually slow down, thereby rapidly reducing the oil flow rate of the oil hole 111 and the oil supply hole 112. This prevents hydraulic shock when the valve is closed and ensures the opening and closing response speed of the cartridge valve.

[0045] It should be noted that the sidewalls of the valve core 3 located at the positions of the first oil guide channel 32 and the second oil guide channel 35 can combine with the inner wall of the oil control chamber 21 located below the raised section 211 to form a cavity structure. In this cartridge valve, the moving speed of the valve core 3 mainly depends on the exchange speed between the cavity structure and the oil control chamber 21 located above the raised section 211. When the valve core 3 moves, the volume of the cavity structure changes, and the oil in the changed volume is replenished and discharged in the oil control chamber 21 located above the raised section 211. Therefore, controlling the exchange speed between the oil in the cavity structure and the oil in the oil control chamber 21 located above the raised section 211 can control the moving speed of the valve core.

[0046] Furthermore, to ensure a sealing effect, both the oil guide groove 33 and the protruding section 211 are arranged along the circumference of the valve core 3;

[0047] Furthermore, to achieve the avoidance effect, the protruding section includes an abutment surface 213 and avoidance ramps 214 disposed on both sides of the abutment surface 213. The abutment surface 213 is connected to the inner side of the oil control chamber 21 through the avoidance ramps 214. The abutment surface 213 abuts against the side wall of the valve core 3 to play a sealing role, while the avoidance ramps 214 can gradually avoid the groove of the oil guide groove 33 as the valve core 3 moves, so as to ensure that the oil guide groove 33 can gradually connect with the oil control chamber 21, ensuring the moving speed of the valve core 3 while preventing the generation of hydraulic shock.

[0048] Preferably, combined with Figures 1 to 4 To achieve multi-stage adjustment of the movement speed of the valve core 3, the valve core 3 is also provided with a second speed regulating hole 34 and a second oil guiding channel 35. The second oil guiding channel 35 runs through both sides of the valve core 3 and is located at the lower part of the first oil guiding channel 32. The second oil guiding channel 35 and the first oil guiding channel 32 are connected through the second speed regulating hole 34.

[0049] As one embodiment, the cartridge valve has three operating states: A, B, and C when it is opened. A is the initial opening state, that is, when the cartridge valve just enters the opening state, the oil in the second oil guide channel 35 flows into the first oil guide channel 32 through the second speed regulating hole 34 and the other oil guide groove 33 located on the upper part of the second oil guide channel 35. However, the oil in the first oil guide channel 32 can only flow into the oil control chamber 21 through the first speed regulating hole 31, resulting in poor flow. This causes the oil pressure in the first oil guide channel 32 and the second oil guide channel 35 to be relatively high, which hinders the opening speed of the valve core 3, thereby slowing down the movement of the valve core 3 and achieving a slow opening effect.

[0050] In the variable speed opening state (B), the protruding section 211 gradually approaches the first oil guide channel 32 as the valve core 3 moves forward, so that the first oil guide channel 32 gradually connects with the oil control chamber 21 through the oil guide groove 33, thereby gradually increasing the moving speed of the valve core 3 and increasing the opening rate.

[0051] In the fully open state (C), the oil in the first oil guide channel 32 flows into the oil control chamber 21 through the first speed regulating hole 31 and the oil guide groove 33 located on the upper part of the first oil guide channel 32. However, the oil in the second oil guide channel 35 can only flow into the oil control chamber 21 through the second speed regulating hole 34, resulting in poor flow. This causes the oil pressure in the second oil guide channel 35 to be relatively high, which hinders the opening speed of the valve core 3. This further reduces the moving speed of the valve core 3, allowing the valve core 3 to open to the correct position and further preventing the generation of hydraulic shock.

[0052] It should be noted that during the entire opening process, the oil pressure in the oil control chamber 21 is always lower than the oil pressure in the oil supply port 112.

[0053] As another embodiment, this cartridge valve has three operating states: D, E, and F when closed. D is the initial closed state, that is, when this cartridge valve just enters the closed state, the oil in the control chamber 21 flows into the first oil guide channel 32 through the first speed regulating hole 31 and the oil guide groove 33 located on the upper part of the first oil guide channel 32. However, the oil in the first oil guide channel 32 can only flow into the second oil guide channel 35 through the second speed regulating hole 34, resulting in poor flow. This causes an oil pressure difference between the second oil guide channel 35 and the control chamber 21, which hinders the closing speed of the valve core 3, causing the valve core 3 to move downward slowly, thus achieving a slow closing effect.

[0054] In the variable speed closed state (E), the protruding section 211 gradually approaches the first oil guide channel 32 as the valve core 3 moves in the opposite direction, so that the second oil guide channel 35 gradually connects with the oil control chamber 21 through the oil guide groove 33, thereby gradually increasing the moving speed of the valve core 3, and thus rapidly reducing the oil flow rate of the oil hole 111 and the oil supply hole 112, thereby preventing hydraulic shock during closure and ensuring the opening and closing response speed of the cartridge valve.

[0055] It should be noted that even if the protruding section 211 is far away from and blocks each oil guide groove 33, the first oil guide channel 32 can still exchange oil through the first speed regulating hole 31. Similarly, the second oil guide channel 35 can also exchange oil through the second speed regulating hole 34.

[0056] When F is in the fully closed state, as the protruding section 211 moves further away from the oil guide groove 33 located above the first oil guide channel 32 with the further movement of the valve core 3, and abuts against the side wall of the valve core 3 located above the first oil guide channel 32, the oil in the oil control chamber 21 can only flow to the second oil guide channel 32 through the first speed regulating hole 31, resulting in poor flow. This causes an oil pressure difference between the first oil guide channel 35 and the oil control chamber 21, thereby reducing the moving speed of the valve core 3 and closing the valve core 3 in place, thus preventing the generation of oil pressure shock when closing.

[0057] It should be noted that during the entire closing process, the oil pressure in the oil control chamber 21 is greater than the oil pressure in the oil supply port 112.

[0058] It should be noted that the width of the oil guide groove 33 affects the moving speed of the valve core 3. When the width of the oil guide groove 33 is large, the valve core 3 moves faster, thus enabling the cartridge valve to open and close quickly. Conversely, when the width of the oil guide groove 33 is small, the valve core 3 moves slower, thus reducing the opening and closing speed of the cartridge valve.

[0059] Preferably, the diameter of the first speed regulating hole 31 is smaller than the diameter of the first oil guiding channel 32 and the diameter of the second oil guiding channel 35, and the diameter of the second speed regulating hole 34 is smaller than the diameter of the first oil guiding channel 32 and the diameter of the second oil guiding channel 35, so as to achieve the functions of flow limiting and speed reduction.

[0060] More preferably, in order to enable the valve core 3 to have a reset function, the cartridge valve with speed regulation function also includes an elastic element 4. The end of the valve core 3 is provided with a first mounting groove 36, and one end of the elastic element 4 is connected to the first mounting groove 36; and the oil control chamber 21 is provided with a second mounting groove 212 opposite to the first mounting groove 36, and the other end of the elastic element 4 is connected to the second mounting groove 212, so as to provide support force for the valve core 3, so that the valve core 3 can be pressed down again to reset after rising;

[0061] In one embodiment, when the oil pressure in the oil control chamber 21 is less than the oil pressure in the oil supply port 112, causing the valve core 3 to rise, the elastic element 4 is compressed and stores elastic potential energy. Therefore, when there is no pressure in the oil control chamber 21 and the oil supply port 112, or when the oil pressure on the valve core 3 is balanced, the elastic element 4 can provide a downward resetting force to the valve core 3, causing the valve core 3 to block the oil outlet port 111 and the oil supply port 112. The first speed regulating hole 31 penetrates the bottom of the first mounting groove 36 to communicate with the oil control chamber 21. It should be noted that the elastic element 4 can be a spring.

[0062] On the other hand, combining Figure 1 and Figure 2To enable the opening and closing function of the cartridge valve, the body 1 is provided with a valve groove 11, an oil outlet 111 penetrating the side wall of the valve groove 11, and an oil supply hole 112 penetrating the bottom of the valve groove 11. The valve core 3 is provided with a sealing part 37 located in the valve groove 11. The sealing part 37 is located below the first oil guide channel 32, so that the sealing part 37 can move along the valve groove 11 as the oil pressure in the oil control chamber 21 changes, and block or avoid the oil outlet 111 and the oil supply hole 112.

[0063] Preferably, the diameter of the sealing part 37 is larger than the length of the first oil guide channel 32 to achieve a sealing effect. More preferably, to ensure stable installation, the cartridge valve with speed regulation function further includes a valve cup 5, which is located in the valve groove 11 and is fitted onto the sealing part 37. The valve cup 5 has a first through hole 51 communicating with the oil outlet 111 and a second through hole 52 communicating with the oil supply hole 112 to ensure the oil flow function of the oil outlet 111 and the oil supply hole 112. The sealing part 37 can reciprocate along the valve cup 5 to ensure the switching speed regulation function of the cartridge valve.

[0064] It should be noted that the inner diameter of the second through hole 52 can be smaller than the width of the sealing part 37, so as to limit the valve core 3; and the inner diameter of the oil supply hole 112 can be smaller than the outer diameter of the second through hole 52, so as to limit the valve cup 5.

[0065] In addition, combined Figure 1 and Figure 5 To improve the versatility of this disassembly valve structure, in one embodiment, the valve core 3 may also be provided with a sliding part 38. The sliding part 38 extends into the oil control chamber 21. The first oil guide channel 32 passes through both sides of the sliding part 38, and the first speed regulating hole 31 passes through the end of the sliding part 38. The oil guide groove 33 is located at the connection between the first oil guide channel 32 and the side wall of the sliding part 38, so that the switching speed adjustment function of the cartridge valve is realized by the sliding part 38. The sliding part 38 and the sealing part 37 are detachably connected. Thus, by using the existing disassembly valve core 3 as the sealing part 37, and by installing the sliding part 38 on the existing disassembly valve core 3, and then replacing the corresponding sealing cap 2, the switching speed adjustment function of the cartridge valve can be realized, improving the response speed of the valve core 3, and without replacing the entire cartridge valve, saving costs.

[0066] It should be noted that the sealing part 37 can be hollowed out to reduce the weight and inertia of the valve core 3, thereby further improving the response speed of the valve core 3.

[0067] Preferably, the width of the sliding part 38 is less than or equal to the width of the sealing part 37, so that the sealing part 37 can play a sealing role and prevent the oil control cavity 21 from leaking without cause.

[0068] More preferably, the cartridge valve with speed regulation function further includes a valve sleeve 6, the cover 2 is connected to the valve cup 5 through the valve sleeve 6, and the sliding part 38 and the sealing part 37 are both partially located inside the valve sleeve 6, so that the valve sleeve 6 plays a transition role.

[0069] More preferably, to achieve the functions of oil supply and drainage to the oil control chamber 21, the cartridge valve with speed regulation function further includes a control valve 7, combined with... Figure 1 As one embodiment, the first oil control channel 22 inside the cover 2 is interconnected with the oil control chamber 21. The control valve 7 is connected to the first oil control channel 22. When closed, the oil in the control valve 7 passes through the first oil guide channel 32 and the oil control chamber 21 in sequence to realize the oil flow function. When open, the oil in the oil control chamber 21 passes through the first oil guide channel 32 and the control valve 7 in sequence to realize the oil discharge function.

[0070] Combination Figure 5 In another embodiment, the valve sleeve 6 is provided with a second oil control channel 61 that is connected to the first oil guide channel 32. The control valve 7 is connected to the second oil control channel 61. When closed, the oil in the control valve 7 passes through the second oil control channel 61, the first oil guide channel 32 and the oil control chamber 21 in sequence to achieve the oil flow function. When open, the oil in the oil control chamber 21 passes through the first oil guide channel 32, the second oil control channel 61 and the control valve 7 in sequence to achieve the oil discharge function.

[0071] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A cartridge valve with speed control function, comprising a body, a cap connected to the body, and a valve core located within the body, the valve core being capable of reciprocating along the body, characterized in that, The cover has an oil control chamber, and the end of the valve core extends into the oil control chamber; The valve core is provided with a first speed regulating hole, a first oil guiding channel and an oil guiding groove. The first oil guiding channel passes through both sides of the valve core, the first speed regulating hole passes through the end of the valve core, and the first oil guiding channel and the oil control chamber are connected through the first speed regulating hole. The oil guide groove is located at the upper part of the first oil guide channel, and the oil guide groove is located at the connection between the first oil guide channel and the valve core sidewall; The oil control chamber is provided with a protruding section that abuts against the side wall of the valve core. As the valve core moves, the protruding section approaches the oil guide groove and gradually avoids the groove opening of the oil guide groove, so that the oil guide groove can gradually connect with the oil control chamber, thereby allowing the first oil guide channel to gradually connect with the oil control chamber through the oil guide groove. The valve core is also provided with a second speed regulating hole and a second oil guiding channel. The second oil guiding channel runs through both sides of the valve core and is located below the first oil guiding channel. The second oil guiding channel and the first oil guiding channel are connected through the second speed regulating hole. Another oil guiding groove is located at the upper part of the second oil guiding channel, and the other oil guiding groove is located at the connection between the second oil guiding channel and the valve core sidewall; The body is provided with a valve groove, an oil outlet hole penetrating the side wall of the valve groove, and an oil supply hole penetrating the bottom of the valve groove. The valve core is provided with a sealing part located in the valve groove. The sealing part is located below the first oil guide channel, and the sealing part can move along the valve groove to block or avoid the oil outlet hole and the oil supply hole.

2. The cartridge valve with speed regulation function as described in claim 1, characterized in that, Both the oil guide groove and the protruding section are arranged along the circumference of the valve core, and the protruding section includes an abutting surface and a relief inclined surface arranged opposite to each other on both sides of the abutting surface. The abutting surface is connected to the inner side of the oil control cavity through the relief inclined surface. The contact surface abuts against the side wall of the valve core, and the avoidance slope gradually avoids the groove of the oil guide groove as the valve core moves.

3. The cartridge valve with speed regulation function as described in claim 1, characterized in that, The diameter of the first speed regulating hole is smaller than the diameter of the first oil guide channel and the diameter of the second oil guide channel, and the diameter of the second speed regulating hole is smaller than the diameter of the first oil guide channel and the diameter of the second oil guide channel.

4. The cartridge valve with speed regulation function as described in claim 1, characterized in that, The cartridge valve with speed regulation function also includes an elastic element. The end of the valve core is provided with a first mounting groove, and one end of the elastic element is connected to the first mounting groove. The oil control chamber is provided with a second mounting groove opposite to the first mounting groove, and the other end of the elastic element is connected to the second mounting groove. The first speed regulating hole penetrates the bottom of the first mounting groove.

5. The cartridge valve with speed regulation function as described in claim 1, characterized in that, The cartridge valve with speed regulation function also includes a valve cup, which is located in the valve groove and is sleeved on the sealing part. The valve cup is provided with a first through hole communicating with the oil outlet and a second through hole communicating with the oil supply hole. The sealing part can reciprocate along the valve cup.

6. The cartridge valve with speed regulation function as described in claim 5, characterized in that, The valve core is also provided with a sliding part, which extends into the oil control chamber, and the sliding part and the sealing part are detachably connected. The width of the sliding part is less than or equal to the width of the sealing part. The first oil guide channel extends through both sides of the sliding part, the first speed regulating hole extends through the end of the sliding part, and the oil guide groove is located at the connection between the first oil guide channel and the side wall of the sliding part.

7. The cartridge valve with speed regulation function as described in claim 6, characterized in that, The cartridge valve with speed regulation function also includes a valve sleeve, the cover is connected to the valve cup through the valve sleeve, and both the sliding part and the sealing part are partially located inside the valve sleeve.

8. The cartridge valve with speed regulation function as described in claim 7, characterized in that, The cartridge valve with speed regulation function also includes a control valve, a first oil control channel that communicates with the oil control chamber inside the cover, and the control valve is connected to the first oil control channel; Alternatively, the valve sleeve may have a second oil control channel that is connected to the first oil guide channel, and the control valve may be connected to the second oil control channel.

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