Overflow valve

Abstract

The utility model belongs to the technical field of hydraulic valves, and discloses an overflow valve. The overflow valve comprises a valve seat, an adjusting rod and a valve element assembly, a limiting piece is arranged on the valve seat in a penetrating mode through a mounting hole, the limiting piece partially protrudes out of the inner wall of the valve seat, the valve element assembly is contained in the valve seat, at least part of the adjusting rod is located in the valve seat and abuts against the valve element assembly, and the adjusting rod can move in the axial direction of the valve seat. The limiting piece abuts against the adjusting rod and is used for limiting the limiting position where the adjusting rod moves towards the outside of the valve seat. The limiting piece is arranged on the valve seat in a penetrating mode through the installation hole to limit the limiting position of the adjusting rod, a complex split valve seat or a high-precision machining installation groove in a traditional design is avoided, and therefore the number of parts is reduced, and manufacturing cost is reduced. The limiting piece is easy and convenient to install, and the assembling efficiency is improved. The set pressure of the overflow valve is adjusted by adjusting the adjusting rod, so that the overflow valve can stably maintain the hydraulic system within a preset range, and the stability and reliability of the whole hydraulic system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a relief valve. Background Art

[0002] The relief valve is a type of pressure control valve that can divert excess hydraulic oil back to the tank to avoid system damage caused by excessive pressure. It is widely used in various hydraulic systems. The relief valve includes an adjusting rod and a valve core assembly. The set pressure of the relief valve can be changed by adjusting the position of the adjusting rod. At present, in order to prevent the adjusting rod from being over-adjusted and causing dangerous situations such as oil leakage, common relief valves usually use mechanical limiters to limit the position. The first method is to design a split valve seat to limit the adjusting rod. This type of relief valve has many parts and high cost, which is not suitable for current cost management. The second method is to machine a mounting groove in the valve seat and install a wire retaining ring in the mounting groove to limit the adjusting rod. This type of relief valve requires high processing precision and low assembly efficiency.

[0003] Therefore, it is necessary to provide a relief valve to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a relief valve with a small number of parts, reduced manufacturing cost, simple installation and improved assembly efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A relief valve, comprising:

[0007] A valve seat, wherein a limiting member is provided on the valve seat through a mounting hole, and the limiting member partially protrudes from an inner wall of the valve seat;

[0008] An adjusting rod and a valve core assembly, wherein the valve core assembly is accommodated in the valve seat, the adjusting rod is at least partially located in the valve seat and abuts against the valve core assembly, the adjusting rod can move axially along the valve seat, and the limit member abuts against the adjusting rod and is used to limit the adjusting rod to an extreme position of movement outside the valve seat.

[0009] Preferably, the limiting member is interference fit with the mounting hole.

[0010] Preferably, the limiting member is threadedly engaged with the mounting hole.

[0011] Preferably, the outer side wall of the adjusting rod is provided with a shoulder, and the shoulder can abut against the limiting member.

[0012] Preferably, the number of the limiting member is one, or the number of the limiting members is multiple, and the multiple limiting members are distributed around the circumference of the valve seat.

[0013] Preferably, the regulating rod is threadedly connected to the valve seat.

[0014] Preferably, the overflow valve further comprises:

[0015] A locking nut is threadedly connected to a portion of the regulating rod located outside the valve seat, and the locking nut abuts against the valve seat.

[0016] Preferably, a valve port and an oil inlet are provided on the valve seat, the oil inlet is connected to the valve port via an oil passage, the valve core assembly is at least partially slidably disposed in the oil passage, an oil gap exists between the periphery of the valve core assembly and the oil passage, hydraulic oil can flow from the oil inlet into the oil gap, and the valve core assembly is used to open or close the valve port.

[0017] Preferably, the valve core assembly includes:

[0018] A valve core and an elastic member, wherein the elastic member is arranged between the valve core and the regulating rod, and the valve core is used to open or close the valve port.

[0019] Preferably, the overflow valve further includes a sealing member, which is sleeved on the regulating rod to seal the regulating rod and the valve seat in a radial direction.

[0020] Beneficial effects of the utility model:

[0021] This relief valve includes a valve seat, an adjusting rod, and a valve core assembly. A stopper is provided through a mounting hole in the valve seat, partially protruding from the inner wall of the valve seat. The valve core assembly is housed within the valve seat. The adjusting rod is at least partially located within the valve seat and abuts against the valve core assembly, allowing the adjusting rod to move axially along the valve seat. The stopper abuts against the adjusting rod and serves to limit the maximum position at which the adjusting rod can move outward from the valve seat. By adjusting the position of the adjusting rod, the set pressure of the relief valve can be adjusted, enabling the relief valve to stably maintain the hydraulic system within a preset range, thereby improving the stability and reliability of the entire hydraulic system. The stopper is provided through the mounting hole in the valve seat to limit the maximum position at which the adjusting rod can move outward from the valve seat. This avoids the complex split valve seat or high-precision machined mounting grooves required in traditional designs, thereby reducing the number of parts and lowering manufacturing costs. Because the stopper is a separate component and is provided through the mounting hole in the valve seat, installation of the stopper is simplified, improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the relief valve provided by the utility model.

[0023] In the picture:

[0024] 1. Valve seat; 11. Inner cavity; 12. Valve port; 13. Oil inlet; 14. Oil passage; 15. Oil return port;

[0025] 2. Limiting parts;

[0026] 3. Adjustment rod; 31. Shaft shoulder;

[0027] 4. Valve core assembly; 41. Valve core; 42. Elastic member;

[0028] 5. Lock nut;

[0029] 6. Seals. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] The relief valve is a type of pressure control valve that can divert excess hydraulic oil back to the tank to avoid system damage caused by excessive pressure. It is widely used in various hydraulic systems. The relief valve includes an adjusting rod and a valve core assembly. The set pressure of the relief valve can be changed by adjusting the position of the adjusting rod. At present, in order to prevent the adjusting rod from being over-adjusted and causing dangerous situations such as oil leakage, common relief valves usually use mechanical limiters to limit the position. The first method is to design a split valve seat to limit the adjusting rod. This type of relief valve has many parts and high cost, which is not suitable for current cost management. The second method is to machine a mounting groove in the valve seat and install a wire retaining ring in the mounting groove to limit the adjusting rod. This type of relief valve requires high processing precision and low assembly efficiency.

[0035] In order to solve the above problems, Figure 1 As shown, this embodiment provides a relief valve, which includes a valve seat 1, an adjusting rod 3 and a valve core assembly 4. A limit member 2 is passed through the valve seat 1 through a mounting hole. The limit member 2 partially protrudes from the inner wall of the valve seat 1. The valve core assembly 4 is accommodated in the valve seat 1. The adjusting rod 3 is at least partially located in the valve seat 1 and is against the valve core assembly 4. The adjusting rod 3 can move axially along the valve seat 1. The limit member 2 is against the adjusting rod and is used to limit the limit position of the adjusting rod 3 moving out of the valve seat 1.

[0036] By adjusting the position of the regulating rod 3, the set pressure of the relief valve can be adjusted, allowing the relief valve to stably maintain the hydraulic system within a preset range, thereby improving the stability and reliability of the entire hydraulic system. A limiter 2 is provided through the mounting hole of the valve seat 1 to limit the extreme position of the regulating rod 3's movement outward from the valve seat 1. This avoids the complex split valve seat or high-precision machined mounting grooves in traditional designs, thereby reducing the number of parts and lowering manufacturing costs. Because the limiter 2 is an independent component and is installed through the mounting hole on the valve seat 1, the limiter 2 is easy to install, improving assembly efficiency.

[0037] In an optional embodiment, the stopper 2 is interference-fitted with the mounting hole, which ensures a tight connection between the stopper 2 and the valve seat 1, making it difficult for the stopper 2 to loosen, and effectively limiting the limit position of the adjustment rod 3 moving outward from the valve seat 1, thereby improving reliability.

[0038] During implementation, the size of the stopper 2 is slightly larger than that of the mounting hole. The stopper 2 is tightly inserted into the mounting hole by press-fitting or thermal expansion and contraction, thereby achieving interference fit on the valve seat 1. Specifically, the stopper 2 is a cylindrical pin, which typically has high strength and hardness, capable of withstanding significant pressure and impact. As a standardized component, the cylindrical pin has relatively low production costs and is easy to procure and stock. Using a cylindrical pin as the stopper 2 not only reduces production costs but also improves production efficiency and quality stability.

[0039] In another optional embodiment, the stopper 2 is threadedly engaged with the mounting hole. By rotating the stopper 2, the stopper 2 can be tightly fixed to the valve seat 1, forming a strong mechanical connection and improving stability and reliability. When the stopper 2 needs to be replaced, it can be completed by simply rotating the stopper 2 in the opposite direction, eliminating the need for complex disassembly and reinstallation. This not only saves time and cost, but also reduces operational difficulty and risk.

[0040] During the specific implementation, the wall of the mounting hole is provided with a thread matching the stopper 2, so that the stopper 2 engages with the mounting hole thread. Specifically, the stopper 2 is a screw. As a common fastener, screws have relatively low production costs and are easy to purchase and stock. This can reduce the production cost of the relief valve. At the same time, due to the versatility and ease of operation of screws, installation and maintenance costs can also be reduced, thereby improving overall economic benefits.

[0041] In some embodiments, the number of the limiting member 2 is one, which makes the structure of the relief valve more concise, reduces the number of parts and the time required for assembly, reduces production costs, and improves production speed.

[0042] In other embodiments, there are multiple stoppers 2, and the multiple stoppers 2 are distributed circumferentially around the valve seat 1. Multiple stoppers 2 can disperse the impact force of the regulating rod 3 on the valve seat 1, reducing the load borne by a single stopper 2, thereby enhancing the structural strength of the relief valve, improving its pressure resistance and service life. The distribution of multiple stoppers 2 can provide more contact points for the regulating rod 3, thereby improving the stability and reliability of the limiting operation.

[0043] Specifically, the outer wall of the adjusting rod 3 is provided with a shoulder 31, which can abut against the stopper 2. When the adjusting rod 3 moves axially to adjust the set pressure, the shoulder 31 thereon moves with it and abuts against the stopper 2 when it reaches the limit position, thereby stopping the adjusting rod 3 from moving further and preventing the adjusting rod 3 from being screwed out of the valve seat 1, which could lead to dangerous situations such as oil leakage.

[0044] Specifically, the adjusting rod 3 is threadedly connected to the valve seat 1. That is, by screwing the adjusting rod 3, the adjusting rod 3 and the valve seat 1 can be fixed, and by changing the screwing depth, the depth of the adjusting rod 3 inserted into the valve seat 1 can be changed, thereby changing the set pressure of the relief valve. This is convenient, fast and easy to operate.

[0045] Furthermore, if Figure 1 As shown, this relief valve also includes a locking nut 5, which is threadedly connected to the portion of the adjusting rod 3 located outside the valve seat 1, and the locking nut 5 abuts the valve seat 1. By being threadedly connected to the portion of the adjusting rod 3 located outside the valve seat 1, the locking nut 5 can tightly fix the adjusting rod 3, preventing it from loosening due to vibration or pressure fluctuations during operation, thereby improving the stability of the adjusting rod 3 and ensuring that the pressure value set by the relief valve will not change due to loosening of the adjusting rod 3, thereby ensuring the stable operation of the hydraulic system. When the set pressure needs to be adjusted, the locking nut 5 is loosened and the adjusting rod 3 is screwed to the desired position, and then the locking nut 5 is screwed until it abuts the valve seat 1, thereby locking the adjusting rod 3 and preventing it from loosening.

[0046] Specifically, if Figure 1 As shown, the valve seat 1 is provided with a valve port 12 and an oil inlet 13. The oil inlet 13 communicates with the valve port 12 via an oil passage 14. The valve core assembly 4 is at least partially slidably disposed within the oil passage 14. An oil gap exists between the outer periphery of the valve core assembly 4 and the oil passage 14. Hydraulic oil can flow from the oil inlet 13 into the oil gap. The valve core assembly 4 is used to open or close the valve port 12. When the pressure within the hydraulic system exceeds the set pressure, the hydraulic oil enters the oil passage 14 through the oil inlet 13 and flows into the oil gap, generating pressure on the valve core assembly 4. This pressure is the hydraulic system pressure. Because the hydraulic system pressure is greater than the set pressure, i.e., greater than the preload force of the elastic member 42, the hydraulic oil pushes the valve core assembly 4 to the left, opening the valve port 12. After flowing into the inner cavity 11, the hydraulic oil flows through the oil return port 15 to the oil tank, reducing the pressure in the hydraulic system. The valve core assembly 4 then moves rightward under the action of the elastic force to reset, closing the valve port 12 and preventing the hydraulic oil from flowing out.

[0047] In this embodiment, if Figure 1 As shown, the valve core assembly 4 includes a valve core 41 and an elastic member 42. The elastic member 42 is disposed between the valve core 41 and the regulating rod 3. The valve core 41 is used to open or close the valve port 12. By adjusting the position of the regulating rod 3, the preload force of the elastic member 42 is changed. This preload force is the set pressure of the relief valve.

[0048] Specifically, the elastic member 42 is a spring.

[0049] Specifically, if Figure 1As shown, the relief valve further includes a sealing member 6, which is sleeved on the regulating rod 3 to radially seal the regulating rod 3 and the valve seat 1. The sealing member 6 is provided to prevent the hydraulic oil flowing into the valve seat 1 from leaking out.

[0050] In this embodiment, the adjusting rod 3 is provided with a mounting groove, into which the seal 6 is mounted. The mounting groove provides a fixed mounting position for the seal 6, ensuring that the seal 6 is accurately aligned with the area to be sealed. This helps reduce the risk of leakage caused by improper positioning of the seal 6. The design of the mounting groove ensures that the seal 6 is firmly fixed to the adjusting rod 3, and is not easily dislodged or shifted even under high pressure or vibration conditions.

[0051] Specifically, the sealing member 6 is an O-ring.

[0052] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A relief valve, characterized in that: include: A valve seat (1), wherein a limiting member (2) is provided on the valve seat (1) through a mounting hole, and a portion of the limiting member (2) protrudes from an inner wall of the valve seat (1); An adjusting rod (3) and a valve core assembly (4), wherein the valve core assembly (4) is accommodated in the valve seat (1), the adjusting rod (3) is at least partially located in the valve seat (1) and abuts against the valve core assembly (4), the adjusting rod (3) is capable of axial movement along the valve seat (1), and the limiting member (2) abuts against the adjusting rod (3) and is used to limit the adjusting rod (3) to an extreme position of movement outside the valve seat (1).

2. The relief valve according to claim 1, characterized in that The limiting member (2) is interference-fitted with the mounting hole.

3. The relief valve according to claim 1, characterized in that The limiting member (2) is threadedly engaged with the mounting hole.

4. The relief valve according to claim 1, characterized in that The outer side wall of the regulating rod (3) is provided with a shaft shoulder (31), and the shaft shoulder (31) can abut against the limiting member (2).

5. The relief valve according to claim 1, characterized in that The number of the limiting member (2) is one, or the number of the limiting member (2) is multiple, and the multiple limiting members (2) are distributed around the circumference of the valve seat (1).

6. The relief valve according to claim 1, characterized in that The regulating rod (3) is threadedly connected to the valve seat (1).

7. The relief valve according to claim 4, characterized in that: The relief valve further comprises: A locking nut (5), wherein the locking nut (5) is threadedly connected to a portion of the regulating rod (3) located outside the valve seat (1), and the locking nut (5) abuts against the valve seat (1).

8. The relief valve according to any one of claims 1 to 7, characterized in that: The valve seat (1) is provided with a valve port (12) and an oil inlet (13), the oil inlet (13) and the valve port (12) are connected via an oil passage (14), the valve core assembly (4) is at least partially slidably disposed in the oil passage (14), an oil gap exists between the outer periphery of the valve core assembly (4) and the oil passage (14), hydraulic oil can flow from the oil inlet (13) into the oil gap, and the valve core assembly (4) is used to open or close the valve port (12).

9. The relief valve according to claim 8, characterized in that The valve core assembly (4) comprises: A valve core (41) and an elastic member (42), wherein the elastic member (42) is arranged between the valve core (41) and the regulating rod (3), and the valve core (41) is used to open or close the valve port (12).

10. The relief valve according to any one of claims 1 to 7, characterized in that: The overflow valve further comprises a sealing member (6), wherein the sealing member (6) is sleeved on the regulating rod (3) to seal the regulating rod (3) and the valve seat (1) in a radial direction.

Images