Overflow valve

Abstract

The utility model relates to the technical field of overflow valves, in particular to an overflow valve. The overflow valve comprises a valve seat and a valve element, the valve seat comprises a main body seat and a split seat, the split seat is installed in the main body seat, and an oil inlet hole and an overflow hole are formed in the main body seat. The valve element is installed in the main body seat, the split body seat is provided with a valve port, the valve port is located between the oil inlet and the overflow hole, and the valve element can act in the axial direction of the main body seat valve so as to open or close the valve port. According to the overflow valve, the valve seat is arranged to be of a split structure of the main body seat and the split seat, and meanwhile, the split seat is provided with the valve port, so that the machining difficulty of the valve seat and the valve port and the detection difficulty of the valve port are reduced, the machining quality of the valve port is improved, quality defects such as burrs of the valve port are avoided, damage of the valve port to the valve element is avoided, and the service life of the valve element is prolonged. And the durability of the overflow valve and the sealing performance at the valve port are improved.

Description

Technical Field

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

[0002] The valve seat of the existing overflow valve is mostly an integrally formed structure, with a valve cavity for accommodating the valve core in the valve seat, and the valve cavity is a blind hole structure. The valve core moves back and forth along the axial direction of the valve seat in the valve cavity to make the cone valve part of the valve core (sealing K angle) open or close the valve port. When the valve core opens the valve port, the oil inlet hole on the valve seat is connected to the overflow hole of the valve seat through the valve port.

[0003] Due to the long length of the valve cavity and the blind hole structure of the valve cavity, the difficulty of processing the valve seat is increased. At the same time, the valve port is located at a deeper position in the valve cavity, which makes the valve port difficult to process and prone to quality defects such as burrs. As a result, the processing quality of the valve port surface is low and the inspection is difficult, which can easily cause damage to the cone valve part of the valve core, reducing the durability of the relief valve and the sealing performance at the valve port. Utility Model Content

[0004] The purpose of the utility model is to provide a relief valve to reduce the difficulty of machining the valve seat and detecting the valve port, improve the machining quality of the valve port in the valve seat, avoid damage to the valve core, and improve the durability and sealing performance of the relief valve.

[0005] To achieve this purpose, the technical solution adopted in this utility model is:

[0006] Relief valve, including:

[0007] The valve seat comprises a main body seat and a split seat, the split seat is installed in the main body seat, and the main body seat is provided with an oil inlet hole and an overflow hole;

[0008] A valve core is installed in the main body seat, the split seat has a valve port, the valve port is located between the oil inlet hole and the overflow hole, and the valve core can move along the axial direction of the main body seat to open or close the valve port.

[0009] As an optional solution for the overflow valve, the surface hardness of the material of the split seat is greater than the hardness of the material of the main body seat, and the split seat is press-fitted with the main body seat.

[0010] As an optional solution for the overflow valve, the surface of the split seat has a hard layer.

[0011] As an optional solution for the overflow valve, the main body seat is provided with a first cavity, an installation cavity and a second cavity which are connected in sequence in a stepped structure. The overflow hole is connected to the first cavity. The split seat is installed in the installation cavity and rests on the stepped surface between the installation cavity and the second cavity. The oil inlet hole is connected to the second cavity.

[0012] As an optional solution for the overflow valve, the valve core includes a connected conical valve portion and a damping head, and a portion of the conical valve portion is inserted through the split seat to open or close the valve port; the damping head extends into the second cavity and forms a damping cavity with the closed end of the second cavity; the damping cavity can be connected to the oil inlet hole through the gap between the damping head and the cavity wall of the second cavity.

[0013] As an optional solution for the overflow valve, the split seat has a guide slope, the guide slope is arranged in a flared shape, and the wall forming the valve port includes the guide slope;

[0014] The outer peripheral surface of the cone valve portion is a cone surface capable of abutting against the guide slope, and the cone surface and the guide slope have the same inclination direction but different inclination angles.

[0015] As an optional solution of the overflow valve, the overflow valve further includes:

[0016] A valve sleeve, the valve sleeve is connected to the main body seat and the valve sleeve is adjustable in axial direction;

[0017] An elastic member, wherein one end of the cone valve portion away from the damping head is integrally provided with a support seat, and both ends of the elastic member are respectively pressed against the valve sleeve and the support seat.

[0018] As an optional solution for the overflow valve, a protrusion is provided on an end of the cone valve portion away from the damping head, and the protrusion protrudes from the surface of the support seat away from the cone valve portion;

[0019] An accommodating groove is provided in the valve sleeve, one end of the elastic member is sleeved on the convex column, and the other end of the elastic member is installed in the accommodating groove.

[0020] As an optional solution for the overflow valve, a portion of the first chamber close to the first end of the main body seat is circumferentially provided with an adjustment groove, and the valve sleeve is provided with a flange portion, which is threadedly connected to the adjustment groove.

[0021] As an optional solution of the overflow valve, the overflow valve further includes a locking ring, which is pressed against the first end of the main body seat and locks the valve sleeve and the main body seat.

[0022] The beneficial effects of the utility model are:

[0023] The overflow valve proposed in the utility model sets the valve seat into a split structure of a main seat and a split seat, and at the same time provides a valve port on the split seat, thereby reducing the difficulty of processing the valve seat and the valve port and the difficulty of detecting the valve port, improving the processing quality of the valve port, avoiding quality defects such as burrs on the valve port, thereby avoiding damage to the valve core by the valve port, and improving the durability of the overflow valve and the sealing performance at the valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a relief valve provided by an embodiment of the present utility model;

[0025] Figure 2 It is a cross-sectional view of the relief valve provided by an embodiment of the present utility model;

[0026] Figure 3 This is a cross-sectional view of the main body seat provided by an embodiment of the present utility model;

[0027] Figure 4 It is a structural schematic diagram of the split seat provided by an embodiment of the utility model.

[0028] The names and numbers of the components in the figure are as follows:

[0029] 1. Main seat; 11. Oil inlet hole; 12. Overflow hole; 13. Mounting cavity; 14. First cavity; 141. Adjusting groove; 15. Second cavity; 151. Damping cavity; 16. Stop groove; 2. Split seat; 21. Valve port; 22. Guide slope; 3. Valve core; 31. Conical valve part; 311. Conical surface; 32. Damping head; 33. Support seat; 34. Boss; 4. Valve sleeve; 41. Accommodating groove; 42. Flange part; 5. Elastic member; 6. Stop part; 7. Locking ring. DETAILED DESCRIPTION

[0030] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain 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 it.

[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, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] This embodiment proposes a relief valve, which is widely used in hydraulic systems in industrial fields such as aerial work vehicles, construction machinery, warehousing and logistics, and agricultural machinery to play the role of pressure stabilization, pressure limiting overflow, system unloading, and system back pressure.

[0036] In the existing relief valve, the valve cavity is long and has a blind hole structure, which increases the difficulty of processing the valve seat. At the same time, the valve port is located at a deeper position in the valve cavity, making the valve port difficult to process and prone to quality defects such as burrs. As a result, the processing quality of the valve port surface is low and the inspection is difficult, which easily causes damage to the cone valve part of the valve core, reducing the durability of the relief valve and the sealing performance at the valve port.

[0037] To solve the above problems, Figure 1 and Figure 2As shown, the relief valve of this embodiment includes a valve seat and a valve core 3. The valve seat includes a main body seat 1 and a split seat 2. The split seat 2 is installed in the main body seat 1. The main body seat 1 is provided with an oil inlet hole 11 and an overflow hole 12. The split seat 2 is located between the oil inlet hole 11 and the overflow hole 12. The split seat 2 has a valve port 21, which is located between the oil inlet hole 11 and the overflow hole 12. The valve port 21 extends through both ends of the split seat 2 along the axial direction (left and right in the figure). The valve core 3 is installed in the main body seat 1 and can move along the axial direction of the main body seat 1 to open or close the valve port 21. By setting the valve seat as a split structure of a main seat 1 and a split seat 2, and at the same time providing a valve port 21 on the split seat 2, the processing difficulty of the valve seat and the valve port 21 and the detection difficulty of the valve port 21 are reduced, the processing quality of the valve port 21 is improved, and quality defects such as burrs on the valve port 21 are avoided, thereby avoiding damage to the valve core 3 by the valve port 21, and improving the durability of the overflow valve and the sealing performance at the valve port 21.

[0038] like Figure 1 and Figure 2 As shown, when the relief valve is in use, the oil inlet 11 is connected to an external oil pipe to allow high-pressure oil to flow into the oil inlet 11. The overflow hole 12 is connected to an external oil tank through an oil return pipe to return the high-pressure oil at the oil inlet 11 to the oil tank through the valve port 21 and the overflow hole 12.

[0039] like Figure 1 and Figure 2 As shown, the relief valve also includes a valve sleeve 4 and an elastic member 5. The first end of the main seat 1 (the middle left end in the figure) has an opening, and the second end of the main seat 1 (the right end in the figure) is closed. The valve sleeve 4 is sealed and installed on the first end of the main seat 1, and the elastic member 5 is installed between the valve sleeve 4 and the valve core 3. Specifically, the elastic member 5 is a spring, and the spring structure is simple, which is easy to use and install. Of course, the elastic member 5 can also be other elastic components such as shrapnel, elastic rubber, etc. The spring is installed between the valve sleeve 4 and the valve core 3, and the working pressure of the relief valve (that is, the preload force of the elastic member 5 under different compression degrees) is adjusted by controlling the compression amount of the elastic member 5. When high-pressure oil is introduced into the oil inlet 11, the pressure of the oil is less than the preload force of the spring. Under the action of the spring preload force, the valve core 3 blocks the valve port 21 of the split seat 2 to separate the oil inlet 11 and the overflow hole 12, and the relief valve is in a closed state. As the oil pressure increases and exceeds the preload of the spring, the valve core 3 moves from right to left under the action of the oil pressure and compresses the elastic member 5. A gap appears between the valve core 3 and the valve port 21, the oil inlet hole 11 and the overflow hole 12 are connected, and the overflow valve is in the open state.

[0040] In this embodiment, the split seat 2 has a valve port 21, and the split seat 2 is press-fitted with the main seat 1 to separate the valve port 21 from the main seat 1, so as to facilitate the processing of the valve port 21 and the measurement operation after processing, and avoid the occurrence of quality defects such as burrs at the valve port 21 due to poor processing, thereby avoiding scratching the surface of the valve core 3, so as to ensure the sealing effect between the valve core 3 and the valve port 21. At the same time, the surface hardness of the material of the split seat 2 is greater than the hardness of the material of the main seat 1. Specifically, the split seat 2 is hardened so that the surface of the split seat 2 has a hard layer, so as to increase the structural strength and durability of the split seat 2 and improve the service life of the relief valve. Figure 2 and Figure 3 As shown, the main body 1 is provided with a first cavity 14, a mounting cavity 13, and a second cavity 15, which are sequentially connected in a stepped structure. The overflow hole 12 is connected to the first cavity 14. The split seat 2 is installed in the mounting cavity 13 and abuts against the stepped surface between the mounting cavity 13 and the second cavity 15. The oil inlet hole 11 is connected to the second cavity 15. By installing the split seat 2 in the mounting cavity 13, the stability of the installation of the split seat 2 is improved.

[0041] Specifically, the valve core 3 includes a connected cone valve portion 31 and a damping head 32. Part of the cone valve portion 31 is inserted into the split seat 2 to open or close the valve port 21. The damping head 32 extends into the second chamber 15 and forms a damping chamber 151 with the closed end of the second chamber 15. The damping chamber 151 can be connected to the oil inlet 11 through the gap between the damping head 32 and the cavity wall of the second chamber 15. The cone valve portion 31 is the sealing K angle of the valve core 3, and the outer peripheral surface of the cone valve portion 31 is a cone surface 311, so that the cone valve portion 31 is in linear contact with the valve port 21, thereby improving the sealing effect of the cone valve portion 31 on the valve port 21. There is a gap channel between the damping head 32 and the inner wall of the second chamber 15, so that the oil inlet 11 is connected to the damping chamber 151 through the gap channel.

[0042] When high-pressure oil is introduced into the oil inlet 11 of the relief valve, it enters the second chamber 15. The left and right sides of the annular groove between the cone valve portion 31 and the damping head 32 are evenly pressurized, and the valve core 3 does not move due to the preload force of the elastic member 5. As the oil pressure in the annular groove increases, the high-pressure oil enters the damping chamber 151 through the gap channel, so that the oil pressure of the high-pressure oil is applied to the right end of the valve core 3 (damping head 32), and the valve core 3 is subjected to pressure to the left. When the oil pressure in the damping chamber 151 is greater than the preload force of the elastic member 5, the valve core 3 moves from right to left, and the cone valve core 3 opens the valve port 21, allowing the high-pressure oil to overflow into the overflow hole 12 through the open gap between the valve port 21 and the cone valve core 3. When the relief valve switches from an open state to a closed state, the oil in the damping chamber 151 needs to be squeezed out through the gap channel. Since the gap channel is small, the process of the valve core 3 returning to the closed state has a good buffering and damping effect, which reduces the pressure shock when the overflow valve is closed and enhances the stability of the overflow valve.

[0043] Furthermore, if Figure 4 As shown, the split seat 2 has a guide bevel 22, which is set in an expanded shape, and the wall forming the valve port 21 includes the guide bevel 22. The outer peripheral surface of the cone valve portion 31 is a conical surface 311 that can abut against the guide bevel 22. The conical surface 311 and the guide bevel 22 have the same inclination direction and different inclination angles. By providing the guide bevel 22, not only is the guiding effect on the valve core 3 when closing the valve port 21 achieved, but the burrs on the contact position of the valve port 21 with the cone valve portion 31 can also be eliminated, thereby avoiding damage to the conical surface 311 of the cone valve portion 31 and improving the protection of the valve core 3. Since the conical surface 311 and the guide bevel 22 have the same inclination direction and different inclination angles, the conical surface 311 is prevented from abutting against the guide bevel 22, thereby ensuring that there is line contact between the cone valve portion 31 and the valve port 21.

[0044] like Figure 2 and Figure 3 As shown, the valve sleeve 4 is connected to the main seat 1, and the valve sleeve 4 is adjustable in axial position. A support seat 33 is integrally provided at one end of the cone valve portion 31 away from the damping head 32, and the two ends of the elastic member 5 are respectively pressed against the valve sleeve 4 and the support seat 33. By adjusting the axial position of the valve sleeve 4 in the main seat 1, the axial distance between the valve sleeve 4 and the valve core 3 is adjusted, thereby adjusting the preload force of the elastic member 5 to achieve the adjustment of the working pressure of the relief valve. In addition, the support seat 33 is integrally provided on the valve core 3, so that the valve core 3 is integrated with the function of supporting the elastic member 5. There is no need to add additional supporting components when installing the elastic member 5, which reduces the number of components of the relief valve and reduces the cost.

[0045] Furthermore, a protrusion 34 extends from one end of the cone valve portion 31 away from the damping head 32. The protrusion 34 protrudes from the surface of the support seat 33 away from the cone valve portion 31. A receiving groove 41 is defined within the valve sleeve 4. One end of the elastic member 5 is sleeved onto the protrusion 34, while the other end of the elastic member 5 is mounted within the receiving groove 41. In this embodiment, the right end of the spring sleeves onto the protrusion 34 of the valve core 3, while the left end of the spring extends into the receiving groove 41 of the valve seat, ensuring a secure installation of the spring and preventing displacement during expansion and contraction.

[0046] like Figure 2 As shown, the first chamber 14 is provided with an adjustment groove 141 along the circumferential direction at a portion of the first end of the main body seat 1, and the valve sleeve 4 is provided with a flange portion 42, which is threadedly connected to the adjustment groove 141, so that the valve sleeve 4 is threadedly connected to the main body seat 1. By screwing the valve sleeve 4, the axial position of the valve sleeve 4 relative to the main body seat 1 can be adjusted, thereby quickly adjusting the preload force of the spring, making the adjustment process simple and easy, and improving the adjustment efficiency.

[0047] Specifically, when the valve sleeve 4 is rotated to the rightmost end of the adjustment slot 141, the distance between the valve sleeve 4 and the valve core 3 is minimized, and the spring has maximum preload. When the valve sleeve 4 is rotated to the leftmost end of the adjustment slot 141, the distance between the valve sleeve 4 and the valve core 3 is maximized, and the spring has minimum preload. When the relief valve is installed in a hydraulic system, the axial position of the valve sleeve 4 within the main body 1 can be flexibly adjusted according to actual needs to adapt to different relief operating conditions, thereby improving the versatility of the relief valve.

[0048] Further, if Figure 2 and Figure 3 As shown, the inner wall of the first chamber 14 is provided with a stop groove 16, which communicates with the side of the adjustment groove 141 near the first end of the main body 1. A stop portion 6 is mounted within the stop groove 16, which is used to stop the flange portion 42. In this embodiment, the stop portion 6 is a wire retaining ring to enhance the structural strength of the stop portion 6 and its ability to stop the valve sleeve 4. When the valve sleeve 4 moves to the leftmost end of the adjustment groove 141, the flange portion 42 abuts against the stop portion 6, restricting the valve sleeve 4 from further leftward movement. This provides a one-way limit on the valve sleeve 4 from right to left, preventing the valve sleeve 4 from slipping out of the adjustment groove 141.

[0049] In this embodiment, the relief valve further includes a locking ring 7, which abuts against the first end of the main body seat 1 and securely locks the valve sleeve 4 to the main body seat 1. In this embodiment, the locking ring 7 is a locking nut, and the outer peripheral surface of the valve sleeve 4 extending beyond the main body seat 1 has external threads that mate with the locking nut. After the valve sleeve 4 is adjusted to its proper axial position along the main body seat 1, the locking nut is screwed onto the valve sleeve 4, and then the locking nut is tightened until one end of the locking nut abuts against the first end of the main body seat 1. This lock nut secures the valve sleeve 4 to the main body seat 1, preventing the valve sleeve 4 from becoming loose and improving the stability of the relief valve assembly.

[0050] It should be noted that in the cone valve portion 31 of the valve core 3 of this embodiment, by increasing the area of ​​the conical surface 311 of the cone valve portion 31, the opening areas of the oil inlet hole 11 and the overflow hole 12 can be increased. This optimizes the number of oil inlet holes 11 in the relief valve to eight and the number of overflow holes 12 to six, effectively increasing the flow rate of the relief valve by approximately 26%. While the flow area of ​​the relief valve is increased, the effective area of ​​the cone valve portion 31 increases by approximately 46%, further improving the steady-state characteristics of the relief valve.

[0051] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Overflow valve, characterized in that, include: A valve seat, the valve seat comprising a main body seat (1) and a split seat (2), the split seat (2) being installed in the main body seat (1), and the main body seat (1) being provided with an oil inlet hole (11) and an overflow hole (12); A valve core (3) is installed in the main body seat (1), the split seat (2) has a valve port (21), and the valve port (21) is located between the oil inlet hole (11) and the overflow hole (12). The valve core (3) can move along the axial direction of the main body seat (1) to open or close the valve port (21).

2. The relief valve according to claim 1, characterized in that The surface hardness of the material of the split seat (2) is greater than the hardness of the material of the main seat (1), and the split seat (2) and the main seat (1) are press-fitted.

3. The relief valve according to claim 2, characterized in that: The surface of the split seat (2) is provided with a hard layer.

4. The relief valve according to claim 1, characterized in that The main body seat (1) is provided with a first cavity (14), a mounting cavity (13) and a second cavity (15) which are sequentially connected in a stepped structure; the overflow hole (12) is connected to the first cavity (14); the split seat (2) is installed in the mounting cavity (13) and abuts against the stepped surface between the mounting cavity (13) and the second cavity (15); and the oil inlet hole (11) is connected to the second cavity (15).

5. The relief valve according to claim 4, characterized in that: The valve core (3) comprises a connected cone valve portion (31) and a damping head (32); a portion of the cone valve portion (31) is inserted into the split seat (2) to open or close the valve port (21); the damping head (32) extends into the second chamber (15) and forms a damping chamber (151) with the closed end of the second chamber (15); the damping chamber (151) can be communicated with the oil inlet hole (11) through a gap between the damping head (32) and the chamber wall of the second chamber (15).

6. The relief valve according to claim 5, characterized in that The split seat (2) has a guide slope (22), the guide slope (22) is arranged in a flared manner, and the wall forming the valve port (21) includes the guide slope (22); The outer peripheral surface of the cone valve portion (31) is a cone surface (311) capable of abutting against the guide inclined surface (22); the cone surface (311) and the guide inclined surface (22) have the same inclination direction but different inclination angles.

7. The relief valve according to claim 5, characterized in that The relief valve further comprises: A valve sleeve (4), the valve sleeve (4) is connected to the main body seat (1), and the valve sleeve (4) is adjustable in axial position; An elastic member (5) is provided with a support seat (33) integrally at one end of the cone valve portion (31) away from the damping head (32), and two ends of the elastic member (5) are pressed against the valve sleeve (4) and the support seat (33) respectively.

8. The relief valve according to claim 7, characterized in that: A convex column (34) is provided on one end of the cone valve portion (31) away from the damping head (32), and the convex column (34) protrudes from the surface of the support seat (33) away from the cone valve portion (31); A receiving groove (41) is provided in the valve sleeve (4), one end of the elastic member (5) is sleeved on the boss (34), and the other end of the elastic member (5) is installed in the receiving groove (41).

9. The relief valve according to claim 7, characterized in that: The first chamber (14) is provided with an adjustment groove (141) along the circumferential direction at a portion close to the first end of the main body seat (1); the valve sleeve (4) is provided with a flange portion (42); and the flange portion (42) is threadedly connected to the adjustment groove (141).

10. The relief valve according to claim 7, characterized in that The overflow valve further comprises a locking ring (7), wherein the locking ring (7) is pressed against the first end of the main body seat (1) and locks the valve sleeve (4) and the main body seat (1).

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