A cartridge-type oil replenishing valve, a multi-way valve, and engineering machinery

Abstract

This invention provides a cartridge-type oil replenishing valve, a multi-way valve, and engineering machinery, relating to the field of valve equipment technology. The cartridge-type oil replenishing valve includes a valve body, a valve core, an end cap, a resilient reset element, and a pressure stabilizing channel. The valve body has a first channel and a second channel; the first channel is located at the first end of the valve body; the valve core is slidably disposed within the valve body; the end cap is located at the second end of the valve body; the resilient reset element is located between the end cap and the valve core; the pressure stabilizing channel is located at the first end of the valve core and extends into the first channel; the valve core has a reset chamber, which communicates with the first channel through the pressure stabilizing channel. This invention solves the problems of valve core vibration and system pressure instability caused by large pressure changes when the oil replenishing valve is opened in the prior art, effectively stabilizing the oil replenishing pressure during valve core opening, preventing valve core vibration, and stabilizing the system pressure.

Description

Technical Field

[0001] This invention relates to the field of valve equipment technology, specifically to a cartridge-type oil replenishing valve, a multi-way valve, and engineering machinery. Background Technology

[0002] In the hydraulic systems of construction machinery, multi-way directional valves are typically used to control various working devices, requiring the integration of various cartridge valves to achieve different functions.

[0003] In construction machinery, when the hydraulic cylinder of the working device descends rapidly, the descent speed is too fast due to the influence of gravity. The pump's oil supply capacity is insufficient, and negative pressure is formed in the oil inlet chamber, which seriously affects the operating performance of the equipment. The hydraulic cylinder is prone to cavitation due to air intake, which leads to noise, vibration, corrosion of the hydraulic cylinder surface, and a decrease in the elastic modulus of the oil, which can damage the system.

[0004] Therefore, a replenishing valve is needed that can ensure that the hydraulic oil in the working oil chamber cannot leak into the return oil line during normal operation, and can replenish the working oil chamber through the return oil line when negative pressure is generated in the working oil chamber.

[0005] Existing oil replenishment valves suffer from problems such as large opening volume, large pressure changes, valve core vibration, and easy instability of system pressure. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of valve core vibration and system pressure instability caused by large pressure changes when the replenishing valve is opened in the prior art, thereby providing a cartridge-type replenishing valve, a multi-way valve and engineering machinery.

[0007] To address the aforementioned problems, a first aspect of the present invention provides a cartridge-type oil replenishing valve, comprising a valve body, a valve core, an end cap, a resilient reset member, and a pressure stabilizing channel. The valve body has a first channel communicating with a working chamber and a second channel communicating with an oil replenishing chamber; the first channel is located at a first end of the valve body; the second channel is located on a side wall of the valve body; the valve core is slidably disposed within the valve body, and has a closed state that disconnects the first and second channels and an open state that connects the first and second channels; the end cap is located at a second end of the valve body; one end of the resilient reset member is connected to the end cap, and the other end is connected to the valve core; the pressure stabilizing channel is located at the first end of the valve core and extends towards the first channel; a reset chamber is provided within the valve core, and the reset chamber communicates with the first channel through the pressure stabilizing channel.

[0008] Optionally, the first end of the valve core is provided with a pressure stabilizing head, which extends toward the first channel and the pressure stabilizing channel passes through the pressure stabilizing head.

[0009] Optionally, the inner wall of the first channel is provided with a first sealing part; the outer wall near the first end of the valve core is provided with a second sealing part suitable for abutting and cooperating with the first sealing part; the second sealing part is in a closed state when it abuts with the first sealing part; the second sealing part is in an open state when it separates from the first sealing part.

[0010] Optionally, the first sealing part includes an annular protrusion on the inner wall of the first channel, and the second sealing part forms an annular sealing surface when it abuts against the first sealing part.

[0011] Optionally, the second end of the second sealing part gradually narrows towards the first end to form a first conical structure, the pressure stabilizing head is a cylindrical structure, the protrusion has a second conical structure that matches the taper of the second sealing part, and the sealing surface is a conical surface.

[0012] Optionally, the pressure stabilizing head is a cylindrical structure, and the diameter of the pressure stabilizing head is smaller than the diameter of any part of the second sealing part.

[0013] Optionally, the first channel is arranged along the axis of the valve body, and the first channel gradually expands in diameter on the side away from the first sealing part to form a flared mouth; the valve body has at least one through hole on the outer side wall near the first end, and the through hole constitutes the second channel.

[0014] Optionally, the outer wall of the valve core is provided with an annular first sealing groove along its circumference, and a first sealing ring is provided in the first sealing groove, or a retaining ring is also provided, which is suitable for sealing the gap between the inner wall of the valve body and the outer wall of the valve core.

[0015] Optionally, at least one annular second sealing groove is provided on the outer wall of the valve body along its circumference, and a second sealing ring is provided in the second sealing groove.

[0016] Optionally, the valve core is provided with a stepped hole, the inner cavity of which forms a reset cavity, and the diameter of the stepped hole gradually decreases from the second end of the valve core toward the first end of the valve core; a mounting seat suitable for installing the elastic reset element is provided between the end cover and the shoulder of the stepped hole.

[0017] Optionally, the second end of the valve body is provided with an internal thread, the end cap is provided with an external thread, and the end cap and the valve body are threadedly connected; at least part of the outer wall of the valve body is provided with a plug-in structure, which is suitable for insertion into the valve block.

[0018] A second aspect of the present invention provides a multi-way valve, including the cartridge-type replenishing valve described in any of the above technical solutions.

[0019] A third aspect of the present invention provides an engineering machine comprising the aforementioned multi-way valve.

[0020] The present invention has the following advantages:

[0021] 1. Utilizing the technical solution of this invention, under normal operating conditions, the valve core is in a closed state, preventing hydraulic oil leakage from the working chamber to the replenishing chamber. When the pressure in the working chamber drops rapidly, the valve core is in an open state, connecting the second channel and the first channel, enabling the replenishing chamber to replenish oil to the working chamber, preventing cavitation or even negative pressure in the working chamber, and ensuring normal system operation. Since the reset chamber and the first channel are connected via a pressure-stabilizing channel that extends into the first channel, the hydraulic oil pressure flowing from the pressure-stabilizing channel to the reset chamber remains stable during valve core opening, ensuring that the valve core does not experience significant pressure changes due to large opening amounts, preventing vibration during opening, and thus stabilizing the system pressure.

[0022] 2. The pressure stabilizing head can guide the hydraulic oil flowing from the second channel to the first channel when the valve core is opened, thereby further enhancing the pressure stabilizing effect and improving the stability of the valve core opening.

[0023] 3. A sealing surface is formed between the second sealing part and the first sealing part, especially a conical sealing surface, which can increase the sealing area between the first sealing part and the second sealing part, improve the sealing effect, and effectively prevent hydraulic oil from leaking from the working chamber to the replenishing chamber.

[0024] 4. The valve core is provided with a first sealing groove and a first sealing ring is provided in the first sealing groove, which can seal the gap between the inner wall of the valve body and the outer wall of the valve core, prevent the hydraulic oil in the reset chamber from leaking into the oil replenishment chamber, and at the same time guide the movement of the valve core to ensure the coaxiality between the valve core and the valve body.

[0025] 5. By setting a cartridge structure and using a threaded cartridge connection to the valve block, the cartridge-type oil replenishment valve is simple, compact, and has a small installation volume. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This diagram illustrates a structure of a cartridge-type oil replenishing valve in a closed state according to an embodiment of the present invention.

[0028] Figure 2 This diagram illustrates a cartridge-type oil replenishing valve in an open state, according to an embodiment of the present invention.

[0029] Figure 3A schematic diagram of an assembly structure for a cartridge-type oil replenishing valve provided in an embodiment of the present invention is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Valve body; 11. First channel; 12. Second channel; 121. Through hole; 13. First sealing part; 14. Second sealing groove; 15. Second sealing ring; 16. Cartridge structure; 2. Valve core; 21. Second sealing part; 22. Pressure stabilizing channel; 23. First sealing groove; 24. First sealing ring; 25. Retaining ring; 3. End cap; 4. Elastic reset element; 5. Pressure stabilizing head; 6. Valve block; A. Working chamber; B. Oil replenishing chamber; C. Reset chamber. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] To facilitate the introduction of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be regarded as limitations on the present invention.

[0037] Example 1

[0038] A cartridge-type oil replenishing valve, as described in the following figure Figures 1-3 It includes a valve body 1, a valve core 2, an end cap 3, an elastic reset element 4, and a pressure regulating channel 22. The valve body 1 has a first channel 11 communicating with the working chamber A and a second channel 12 communicating with the oil replenishment chamber B; the first channel 11 is located at the first end of the valve body 1, so as to... Figure 1 or Figure 2 From the perspective of orientation, the first end of the valve body 1 is the end located on the right side in the figure; the second channel 12 is disposed on the side wall of the valve body 1; the valve core 2 is slidably disposed inside the valve body 1, and in this embodiment, the valve core 2 is coaxially disposed with the valve body 1; the valve core 2 has a closed state that disconnects the first channel 11 and the second channel 12 and an open state that connects the first channel 11 and the second channel 12; the end cap 3 is disposed at the second end of the valve body 1, so as to... Figure 1 or Figure 2 From the perspective of its orientation, the second end of the valve body 1 is the end located on the left side in the figure; one end of the elastic reset member 4 is connected to the end cap 3, and the other end is connected to the valve core 2, which is suitable for applying a force to the valve core 2 to move the second sealing part 21 closer to the first sealing part 13, so as to Figure 1 or Figure 2 From the perspective of the position, the elastic reset member 4 can apply an elastic force to the valve core 2 to move the valve core 2 to the right; the pressure stabilizing channel 22 is located at the first end of the valve core 2 and extends to the first channel 11; the valve core 2 is provided with a reset cavity C, and the reset cavity C is connected to the first channel 11 through the pressure stabilizing channel 22.

[0039] Furthermore, the inner wall of the first channel 11 is provided with a first sealing part 13; the outer wall near the first end of the valve core 2 is provided with a second sealing part 21 suitable for abutting and cooperating with the first sealing part 13; the second sealing part 21 is in a closed state when it abuts with the first sealing part 13; the second sealing part 21 is in an open state when it separates from the first sealing part 13.

[0040] Specifically, during normal operation, the working chamber A is connected to the reset chamber C through the pressure stabilizing channel 22. Therefore, the internal and external pressures of the valve core 2 are the same. The valve core 2 remains closed under the action of the elastic force of the elastic reset member 4 and the pressure towards the working chamber A generated by the area difference between the first and second ends of the valve core 2. At this time, the second sealing part 21 of the valve core 2 abuts against the first sealing part 13 of the valve body 1, blocking the first channel 11 and the second channel 12. The working chamber A and the oil replenishment chamber B are blocked, and the working chamber A does not need to be replenished with oil. When the oil pressure in the working chamber A drops rapidly, the pressure in the reset chamber C drops accordingly. The pressure in the second channel 12 is greater than the pressure in the first channel 11 and the reset chamber C. Therefore, the pressure of the hydraulic oil overcomes the elastic force of the elastic reset member 4, pushing the valve core 2 towards the second end of the valve body 1. Figure 1 or Figure 2This is manifested as valve core 2 shifting to the left, the second sealing part 21 disengaging from the first sealing part 13, valve core 2 opening, and hydraulic oil flowing from the second channel 12 into the first channel 11, replenishing the working chamber A through the first channel 11. During this period, because at the first end of valve core 2, that is... Figure 1 or Figure 2 A pressure-stabilizing channel 22 is provided at the right end of the valve body 1, extending towards the first channel 11. This avoids the pressure instability area near the valve core 2 in the working chamber A, thus stabilizing the hydraulic oil pressure entering the reset chamber C. This ensures that the valve core 2 does not experience significant pressure changes due to large opening, preventing vibration during opening and ensuring system stability. Once the pressures of the working chamber A and the reset chamber C reach equilibrium again, the elastic reset element 4 pushes the valve core 2 towards the first end of the valve body 1. Figure 1 or Figure 2 In this process, the valve core 2 moves to the right until the second sealing part 21 abuts against the first sealing part 13, and the valve core 2 is completely closed, blocking the first channel 11 and the second channel 12. The oil replenishing chamber B no longer replenishes oil to the working chamber A, and can prevent the hydraulic oil in the working chamber A from leaking towards the oil replenishing chamber B.

[0041] Using the technical solution of this invention, under normal operating conditions, valve core 2 is closed, and the first sealing part 13 and the second sealing part 21 cooperate to prevent hydraulic oil from leaking from working chamber A to replenishing chamber B. When the pressure in working chamber A drops rapidly, valve core 2 opens, and the second channel 12 and the first channel 11 connect, enabling replenishing oil from replenishing chamber B to working chamber A, preventing working chamber A from sucking in air or even generating negative pressure, and ensuring normal system operation. Since the reset chamber C and the first channel 11 are connected through a pressure stabilizing channel 22, and the pressure stabilizing channel 22 extends into the first channel 11, the hydraulic oil pressure flowing from the pressure stabilizing channel 22 to the reset chamber C is stable during the opening process of valve core 2, ensuring that valve core 2 does not experience large pressure changes due to large opening amounts, avoiding valve core 2 vibration during opening, thereby stabilizing system pressure.

[0042] Furthermore, refer to Figure 1 or Figure 2 The first end of the valve core 2 is provided with a pressure stabilizing head 5, which extends toward the first channel 11. The pressure stabilizing channel 22 passes through the pressure stabilizing head 5, so the pressure stabilizing channel 22 extends toward the first channel 11. During the opening process of the valve core 2, the second sealing part 21 disengages from the first sealing part 13, and the hydraulic oil flows from the second channel 12 to the first channel 11. It will pass through the second sealing part 21. The closer to the second sealing part 21, the greater the change in hydraulic oil pressure and the less stable the hydraulic oil flow. The pressure stabilizing channel 22 is provided, and the pressure stabilizing channel 22 extends toward the first channel 11, that is, toward the direction of oil replenishment when the valve core 2 opens. On the one hand, the oil inlet of the pressure stabilizing channel 22 is the port where the hydraulic oil in the first channel 11 enters the reset chamber C during oil replenishment. Figure 1 or Figure 2 The right port of the pressure stabilizing channel 22 is far from the second sealing part 21. The pressure change at the oil inlet of the pressure stabilizing channel 22 is small, and the pressure is stable. On the other hand, referring to... Figure 1 or Figure 2 The pressure stabilizing channel 22 is narrower and longer than the first channel 11 or the second channel 12, which makes the hydraulic oil pressure entering the reset chamber C through the pressure stabilizing channel 22 more stable, thereby avoiding the valve core 2 from shaking due to large pressure changes during the opening process.

[0043] Furthermore, the second end of the second sealing part 21 gradually narrows towards the first end to form a first conical structure, and the pressure stabilizing head 5 is a cylindrical structure, with a diameter smaller than the diameter of any part of the second sealing part 21. Specifically, the diameter of the second end of the second sealing part 21 is larger than the diameter of the first end of the second sealing part 21, and the diameter of the pressure stabilizing head 5 is smaller than the diameter of the first end of the second sealing part 21. (Refer to...) Figure 2 The pressure stabilizing head 5 has a cylindrical structure. During the oil replenishment process, the hydraulic oil flows from the second channel 12 to the first channel 11, such as... Figure 2 The pressure stabilizing head 5, which extends towards the first channel 11 as indicated by the middle arrow, has a cylindrical outer wall that can guide the hydraulic oil, further reducing the pressure change of the hydraulic oil replenished during the opening of the valve core 2, further enhancing the effect of stabilizing the hydraulic oil pressure, and improving the stability of the valve core 2 opening.

[0044] Furthermore, refer to Figure 1 or Figure 2 The first sealing part 13 includes an annular protrusion on the inner wall of the first channel 11, and the second sealing part 21 forms an annular sealing surface when it abuts against the first sealing part 13. At least, the first sealing part 13 and the second sealing part 21 are in line contact when they abut, forming an annular sealing line between them. Of course, in order to improve the sealing effect and control the leakage from the working chamber A to the oil replenishment chamber B, it is preferable to increase the contact area when the first sealing part 13 and the second sealing part 21 abut, that is, to optimize the annular sealing line into an annular sealing surface.

[0045] Furthermore, the protrusion of the first sealing part 13 has a second conical structure that matches the taper of the second sealing part 21, and the sealing surface is a conical surface.

[0046] A sealing surface is formed between the second sealing part 21 and the first sealing part 13, especially a conical sealing surface, which can increase the sealing area between the first sealing part 13 and the second sealing part 21, improve the sealing effect, and effectively prevent hydraulic oil from leaking from the working chamber A to the replenishing chamber B.

[0047] Furthermore, the first channel 11 is arranged along the axis of the valve body 1, that is, the first channel 11 is coaxial with the valve body 1, and the first channel 11 gradually widens on the side away from the first sealing part 13 to form a flared opening; the valve body 1 has at least one through hole 121 on the outer side wall near the first end, and the through hole 121 constitutes the second channel 12. In this embodiment, referring to... Figure 1 or Figure 2 There are two through holes 121 arranged symmetrically. Because the pressure fluctuation is greatest near the first sealing part 13, the first channel 11 is gradually enlarged in diameter in the direction away from the first sealing part 13, and set as a flared mouth. This can increase the flow area of ​​the first channel 11, disperse the flow of hydraulic oil flowing from the second channel 12, avoid pressure concentration at the first sealing part 13, and further reduce the amount of pressure fluctuation. Together with the cylindrical outer wall of the pressure stabilizing head 5 and the pressure stabilizing channel 22, it can more effectively ensure that the valve core 2 opens stably without shaking.

[0048] Furthermore, refer to Figure 1 or Figure 2 The outer wall of the valve core 2 has an annular first sealing groove 23 along its circumference, and a first sealing ring 24 is provided in the first sealing groove 23, which is suitable for sealing the gap between the inner wall of the valve body 1 and the outer wall of the valve core 2. Of course, in some other embodiments, a retaining ring 25 is also provided in the first sealing groove 23.

[0049] The valve core 2 is provided with a first sealing groove 23 and a first sealing ring 24 is provided in the first sealing groove 23. This can seal the gap between the inner wall of the valve body 1 and the outer wall of the valve core 2, preventing the hydraulic oil in the oil replenishment chamber B and the reset chamber C from leaking into each other. At the same time, because the inner ring of the first sealing ring 24 or the retaining ring 25 can guide the movement of the valve core 2, the coaxiality between the valve core 2 and the valve body 1 is guaranteed.

[0050] Furthermore, at least one annular second sealing groove 14 is provided on the outer wall of the valve body 1, which is arranged circumferentially therearound, and a second sealing ring 15 is provided within the second sealing groove 14. (Refer to...) Figure 1 or Figure 2 In this embodiment, two second sealing grooves 14 are provided on the outer side wall of the valve body 1, one near the first end of the valve body 1 and the other near the end cap 3. (Refer to...) Figure 3 When the valve body 1 is inserted into the valve block 6, the second sealing ring 15 can be used to seal the gap between the valve body 1 and the valve block 6 to prevent hydraulic oil in the valve block 6 from leaking into the valve body 1.

[0051] Furthermore, refer to Figure 1 or Figure 2The valve core 2 has a stepped hole, the inner cavity of which forms a reset cavity C. The diameter of the stepped hole decreases sequentially from the second end of the valve core 2 toward the first end. In this embodiment, the stepped hole includes a first segment near the first end of the valve core 2, a middle segment in the middle, and a second segment near the second end of the valve core 2. The diameter of the second segment is smaller than the diameter of the first segment. One side of the first segment communicates with the middle segment, and the other side communicates with the pressure stabilizing channel 22. A mounting seat suitable for installing the elastic reset member 4 is provided between the end cap 3 and the shoulder of the stepped hole. Specifically, in this embodiment, a first shoulder is formed between the middle segment and the second segment of the stepped hole, and a mounting seat is provided between the first shoulder and the end cap 3. The elastic reset member 4 is mounted on the mounting seat.

[0052] Furthermore, the second end of the valve body 1 is provided with an internal thread, and the end cap 3 is provided with an external thread, and the end cap 3 and the valve body 1 are threadedly connected; at least part of the outer side wall of the valve body 1 is provided with an insertion structure 16, suitable for insertion into the valve block 6. In this embodiment, the insertion structure 16 is a connecting thread, as shown in the figure. Figure 3 The connecting thread is located on the outer side wall of the middle part of the valve body 1, allowing it to be inserted into the valve block 6, for example, into the insertion hole of the secondary relief valve, and connected to it by threads. The use of a connecting thread in the insertion structure 16 reduces machining tool costs. In this embodiment, refer to... Figure 3 The valve body 1 has a raised second shoulder in the middle. When the cartridge-type oil replenishment valve is connected to the valve block 6, the end face of the second shoulder abuts against the end face of the connection port of the valve block 6. The aforementioned second sealing groove 14 is set adjacent to the second shoulder. The second sealing ring 15 is located between the second shoulder, the second sealing groove 14 and the side wall of the valve block 6.

[0053] Example 2

[0054] A multi-way valve, including the cartridge-type replenishing valve described in Example 1.

[0055] Example 3

[0056] An engineering machine includes the multi-way valve described in Example 2.

[0057] Based on the above description, this patent application has the following advantages:

[0058] 1. The pressure stabilizing channel 22 can avoid the pressure instability area near the valve core 2 in the working chamber A, ensuring that the valve core 2 will not experience large pressure changes due to large opening, and preventing it from shaking during the opening process, thereby stabilizing the system pressure.

[0059] 2. A sealing surface is formed between the second sealing part 21 and the first sealing part 13, especially a conical sealing surface, which can increase the sealing area between the first sealing part 13 and the second sealing part 21, improve the sealing effect, and effectively prevent hydraulic oil from leaking from the working chamber A to the replenishing chamber B.

[0060] 3. The first sealing ring 24 can seal the gap between the inner and outer walls of the valve body 1 to prevent hydraulic oil in the reset chamber C from leaking into the replenishment chamber B.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A cartridge-type oil replenishing valve, characterized in that, include: The valve body (1) has a first channel (11) communicating with the working chamber (A) and a second channel (12) communicating with the oil replenishment chamber (B); the first channel (11) is located at the first end of the valve body (1); the second channel (12) is located on the side wall of the valve body (1); The valve core (2) is slidably disposed in the valve body (1). The valve core (2) has a closed state that disconnects the first channel (11) and the second channel (12) and an open state that connects the first channel (11) and the second channel (12). End cap (3) is provided at the second end of the valve body (1); The elastic reset member (4) is connected to the end cap (3) at one end and to the valve core (2) at the other end. A pressure regulating channel (22) is provided at the first end of the valve core (2) and extends toward the first channel (11); a reset cavity (C) is provided inside the valve core (2), and the reset cavity (C) is connected to the first channel (11) through the pressure regulating channel (22); The first end of the valve core (2) is provided with a pressure stabilizing head (5), the pressure stabilizing head (5) extends toward the first channel (11), the pressure stabilizing channel (22) passes through the pressure stabilizing head (5), and the pressure stabilizing head (5) is a cylindrical structure; The inner wall of the first channel (11) is provided with a first sealing part (13); the outer wall near the first end of the valve core (2) is provided with a second sealing part (21) suitable for abutting and cooperating with the first sealing part (13); the second end of the second sealing part (21) gradually narrows towards the first end to form a first conical structure, and the diameter of the pressure stabilizing head (5) is smaller than the diameter of any part of the second sealing part (21).

2. The cartridge-type oil replenishing valve according to claim 1, characterized in that, When the second sealing part (21) abuts against the first sealing part (13), it is in the closed state; when the second sealing part (21) and the first sealing part (13) separate, it is in the open state.

3. The cartridge-type oil replenishing valve according to claim 2, characterized in that, The first sealing part (13) includes an annular protrusion on the inner wall of the first channel (11), and the second sealing part (21) forms an annular sealing surface when it abuts against the first sealing part (13).

4. The cartridge-type oil replenishing valve according to claim 3, characterized in that, The protrusion has a second conical structure that matches the taper of the second sealing part (21), and the sealing surface is a conical surface.

5. The cartridge-type oil replenishing valve according to claim 2, characterized in that, The first channel (11) is arranged along the axis of the valve body (1), and the first channel (11) gradually expands in diameter on the side away from the first sealing part (13) to form a flared mouth; the valve body (1) has at least one through hole (121) on the outer side wall near the first end, and the through hole (121) constitutes the second channel (12).

6. The cartridge-type oil replenishing valve according to claim 1, characterized in that, The outer side wall of the valve core (2) is provided with an annular first sealing groove (23) along its circumference. The first sealing groove (23) is provided with a first sealing ring (24) or a retaining ring (25), which is suitable for sealing the gap between the inner side wall of the valve body (1) and the outer side wall of the valve core (2).

7. The cartridge-type oil replenishing valve according to claim 1, characterized in that, The valve core (2) is provided with a stepped hole, and the inner cavity of the stepped hole constitutes the reset cavity (C). The diameter of the stepped hole decreases sequentially from the second end of the valve core (2) toward the first end of the valve core (2). A mounting seat suitable for installing the elastic reset member (4) is provided between the end cap (3) and the shoulder of the stepped hole.

8. The cartridge-type oil replenishing valve according to claim 1, characterized in that, The valve body (1) has an internal thread at its second end and an external thread at its end cap (3). The end cap (3) and the valve body (1) are connected by a thread. At least part of the outer wall of the valve body (1) is provided with an insert structure (16) suitable for insertion into the valve block (6).

9. A multi-way valve, characterized in that, Includes the cartridge-type replenishing valve as described in any one of claims 1 to 8.

10. An engineering machinery, characterized in that, Includes the multi-way valve as described in claim 9.

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