Electromagnetic relief valve

Abstract

The invention discloses an electromagnetic relief valve, and relates to the technical field of hydraulic pressure. The electromagnetic relief valve comprises a main valve sleeve, a main valve element, a pilot assembly, a pushing assembly and an electromagnetic assembly. The main valve sleeve is provided with a main valve cavity, an oil inlet, an oil outlet and a pressure relief hole, the main valve element is in sliding guide fit in the main valve sleeve, and the main valve element can enable the oil inlet and the oil outlet to be communicated or disconnected; the pushing assembly comprises a first elastic piece and a push rod, and the first elastic piece is configured to drive the push rod to push the first pilot valve element to block a passage between the first pilot valve seat and the pressure relief hole; the electromagnetic assembly can drive the second pilot valve element to block a passage between the second pilot valve seat and the pressure relief hole. According to the electromagnetic overflow valve, the overflow function failure caused by the failure of the electromagnetic coil can be avoided, the safety is improved, the threshold value is adjusted through a mechanical structure, and the precision and stability of flow control are improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to an electromagnetic overflow valve. Background Art

[0002] At present, the commonly used electromagnetic relief valves are generally pilot-controlled, mainly including a pilot valve core and an electromagnet. The pilot valve core is controlled by the electromagnet, and the flow through the main valve core is controlled by adjusting the opening between the pilot valve core and the main valve core, thereby adjusting the threshold of the electromagnetic relief valve.

[0003] However, when the electromagnetic coil fails, the pilot valve core of the electromagnetic overflow valve cannot move actively, causing the electromagnetic overflow valve to lose its active threshold function, turning the electromagnetic overflow valve into an ordinary overflow valve, affecting the normal operation of the hydraulic system and even causing serious safety risks to the hydraulic system. Summary of the invention

[0004] The purpose of the present invention is to provide an electromagnetic overflow valve, which can avoid the failure of the overflow function due to the failure of the electromagnetic coil, improve the safety, and use the mechanical structure to adjust the threshold value to improve the accuracy and stability of flow control.

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

[0006] An electromagnetic overflow valve, comprising:

[0007] A main valve sleeve, wherein the main valve sleeve is provided with a main valve cavity and an oil inlet, an oil outlet and a pressure relief hole connected to the main valve cavity;

[0008] A main valve core is movably disposed in the main valve sleeve, the main valve core can connect or disconnect the oil inlet and the oil outlet, the main valve core has a first damping hole, and the first damping hole connects the oil inlet and the main valve chamber;

[0009] A pilot assembly, comprising a first pilot valve core, a first pilot valve seat, a second pilot valve core and a second pilot valve seat, wherein the first pilot valve seat and the second pilot valve seat are both capable of communicating with the main valve cavity and the pressure relief hole;

[0010] A push-up assembly, comprising a first elastic member and a push rod, wherein the first elastic member is configured to drive the push rod to push up the first pilot valve core to block a passage between the first pilot valve seat and the pressure relief hole;

[0011] The electromagnetic assembly includes an electromagnetic coil and a moving iron, wherein the moving iron is movably arranged in the main valve chamber, and when the electromagnetic coil is energized, the moving iron drives the second pilot valve core to block the passage between the second pilot valve seat and the pressure relief hole.

[0012] As an optional solution for the above-mentioned electromagnetic overflow valve, the first pilot valve seat is provided with a first connecting hole connecting the main valve chamber and the pressure relief hole, and the second pilot valve seat is provided with a second connecting hole connecting the main valve chamber and the pressure relief hole, and the diameter of the first connecting hole is larger than the diameter of the second connecting hole.

[0013] As an optional solution of the electromagnetic overflow valve, a second damping hole is provided in the first connecting hole, and the inner diameter of the second damping hole is smaller than the inner diameter of the first connecting hole.

[0014] As an optional solution of the electromagnetic overflow valve, a second elastic member is arranged in the main valve sleeve, and the second elastic member is configured to drive the moving iron away from the second pilot valve seat.

[0015] As an optional solution for the above-mentioned electromagnetic overflow valve, a stop iron and a third elastic member are arranged in the main valve sleeve, and the two ends of the third elastic member respectively abut the stop iron and the main valve core to drive the main valve core to disconnect the oil inlet and the oil outlet, and the first pilot valve seat and the second pilot valve seat are both fixedly arranged on the stop iron.

[0016] As an optional solution for the above-mentioned electromagnetic overflow valve, the outer wall of the stop iron is provided with a connecting platform extending axially to both ends of the stop iron, the connecting platform is spaced apart from the inner wall of the main valve sleeve, and the main valve chamber is connected with the pressure relief hole through the connecting platform.

[0017] As an optional solution for the above-mentioned electromagnetic overflow valve, the stop iron is provided with a third connecting hole and a first mounting hole, the first pilot valve seat is arranged in the first mounting hole, the third connecting hole is arranged at the end of the first pilot valve seat away from the main valve core, and the two ends of the third connecting hole are respectively opened on the inner wall of the first mounting hole and the connecting platform.

[0018] As an optional solution of the electromagnetic overflow valve, the electromagnetic overflow valve further includes a pressure regulating assembly, which is axially movably disposed on the main valve sleeve, and one end of the first elastic member away from the push rod abuts against the pressure regulating assembly.

[0019] As an optional scheme for the above-mentioned electromagnetic overflow valve, the main valve core includes a valve core body and a damping member, the valve core body is provided with a fixing hole, the damping member includes a fixing section and a connecting section, the damping member is fixed in the fixing hole through the fixing section, the connecting section is spaced apart from the inner wall of the fixing hole, the damping member is provided with the first damping hole and an oil hole, both ends of the oil hole are opened on the side wall of the connecting section, and the first damping hole connects the oil hole and the main valve chamber.

[0020] As an optional solution of the electromagnetic overflow valve, the connecting section is provided with an annular groove, and the oil hole is provided in the annular groove.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides an electromagnetic overflow valve. In the electromagnetic overflow valve, the pilot assembly has two pilot valve cores, namely, a first pilot valve core and a second pilot valve core. When the electromagnetic assembly is energized, the second pilot valve core blocks the passage between the second pilot valve seat and the pressure relief hole. At this time, the hydraulic oil at the oil inlet enters the main valve cavity through the damping hole of the main valve core and is blocked by the first pilot valve core. As the oil pressure of the hydraulic oil at the oil inlet increases, the first pilot valve core is pushed and compresses the first elastic member. At this time, the hydraulic oil flows through the first pilot valve seat to the pressure relief hole. The pressure is released, so that a pressure difference is generated at both ends of the main valve core. The main valve core moves to connect the oil inlet with the oil outlet, realizing the overflow function; when the electromagnetic component is powered off, the second pilot valve core has no pressure on the second pilot valve seat, and the hydraulic oil at the oil inlet enters the main valve cavity through the damping hole of the main valve core, and flows to the pressure relief hole through the second pilot valve seat to complete the pressure relief, so that a pressure difference is generated at both ends of the main valve core. The main valve core moves to connect the oil inlet with the oil outlet, avoiding excessive oil pressure due to power failure of the electromagnetic coil, reducing safety risks. Moreover, since the threshold adjustment of the electromagnetic overflow valve is completely dependent on the mechanical mechanism of the first pilot valve core, the first pilot valve seat and the first elastic member, the accuracy and stability of flow control are greatly improved.

[0023] The electromagnetic overflow valve can avoid the failure of the overflow function due to the failure of the electromagnetic coil, thereby improving safety, and utilizes the mechanical structure to adjust the threshold value, thereby improving the accuracy and stability of flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the electromagnetic overflow valve provided by the present invention;

[0025] Figure 2 is a first cross-sectional view of the electromagnetic overflow valve provided by the present invention;

[0026] Figure 3 is a second cross-sectional view of the electromagnetic overflow valve provided by the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the iron stop provided by the present invention;

[0028] Figure 5 It is a structural schematic diagram of the damping element provided by the present invention.

[0029] In the figure:

[0030] 1. Main valve sleeve; 11. Main valve chamber; 12. Oil inlet; 13. Oil outlet; 14. Pressure relief hole; 15. Stop iron; 151. Communication platform; 152. Third communication hole; 153. First mounting hole; 154. Second mounting hole; 16. Third elastic member;

[0031] 2. Main valve core; 21. Valve core body; 211. Small diameter section; 212. Transition section; 213. Large diameter section; 22. Damping element; 221. First damping hole; 222. Fixed section; 223. Communication section; 224. Oil hole; 225. Ring groove;

[0032] 3. Pilot assembly; 31. First pilot valve core; 32. First pilot valve seat; 321. First communication hole; 322. Second damping hole; 33. Second pilot valve core; 34. Second pilot valve seat; 341. Second communication hole;

[0033] 4. Pushing assembly; 41. First elastic member; 42. Push rod;

[0034] 5. Electromagnetic assembly; 51. Moving iron; 52. Second elastic member;

[0035] 6. Pressure regulating assembly; 61. Adjusting rod; 62. Locking nut. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0038] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0041] This embodiment provides an electromagnetic relief valve, such as Figure 1 to Figure 3 As shown, the electromagnetic overflow valve includes a main valve sleeve 1, a main valve core 2 and a pilot structure. The main valve sleeve 1 is provided with a main valve chamber 11 and an oil inlet 12, an oil outlet 13 and a pressure relief hole 14 which are connected to the main valve chamber 11. The main valve core 2 is slidingly guided in the main valve sleeve 1. The main valve core 2 can connect or disconnect the oil inlet 12 and the oil outlet 13. The main valve core 2 has a first damping hole 221, which connects the oil inlet 12 and the main valve chamber 11. The pilot structure can connect or disconnect the pressure relief hole 14 and the main valve chamber 11.

[0042] The sliding guide fit means that there is a certain gap between the main valve core 2 and the main valve sleeve 1, and the main valve core 2 and the main valve sleeve 1 are relatively sealed, and the main valve core 2 is guided and slidably fitted along the inner wall of the main valve core 2. When the pilot structure disconnects the pressure relief hole 14 and the main valve chamber 11, the hydraulic oil at the oil inlet 12 enters the main valve chamber 11 through the first damping hole 221 of the main valve core 2. When the main valve chamber 11 is filled, the oil pressures at both ends of the main valve core 2 are equal and the pressure difference is zero. At this time, the main valve core 2 does not move, and the electromagnetic overflow valve is in a closed state. When the pilot structure connects the pressure relief hole 14 and the main valve chamber 11, the hydraulic oil in the main valve chamber 11 flows out through the pressure relief hole 14. Due to the damping hole, the flow rate of the hydraulic oil entering the main valve chamber 11 from the oil inlet 12 is reduced. Therefore, the oil pressures at both ends of the main valve core 2 are unequal at this time, resulting in a pressure difference. The main valve core 2 moves under the drive of the pressure difference to connect the oil inlet 12 with the oil outlet 13, thereby realizing the overflow function.

[0043] It is worth noting that the pilot structure can adjust the threshold value of the electromagnetic overflow valve by adjusting the flow rate of the hydraulic oil flowing through the pressure relief hole 14 .

[0044] Generally speaking, the pilot structure includes a pilot valve core and an electromagnetic assembly 5. The electromagnetic assembly 5 includes an electromagnetic coil and a moving iron 51. The moving iron 51 is connected to the pilot valve core. The pilot valve core is driven to move by energizing the electromagnetic coil, and the opening of the pilot valve core is adjusted by adjusting the current of the electromagnetic coil, thereby adjusting the flow rate of the hydraulic oil flowing through the pressure relief hole 14.

[0045] However, when the electromagnetic coil fails, the pilot valve core of the battery overflow valve cannot move, which may easily lead to the inability to adjust the threshold of the electromagnetic overflow valve, causing the electromagnetic overflow valve to lose its overflow function, affecting the normal operation of the hydraulic system, and in serious cases causing safety risks to the hydraulic system.

[0046] like Figure 2 and Figure 3 As shown, in order to solve the above problems, in the present embodiment, the pilot structure includes a pilot component 3 and a push-up component 4, the pilot component 3 includes a first pilot valve core 31, a first pilot valve seat 32, a second pilot valve core 33 and a second pilot valve seat 34, the first pilot valve seat 32 and the second pilot valve seat 34 can both connect the main valve chamber 11 and the pressure relief hole 14; the push-up component 4 includes a first elastic member 41 and a push rod 42, the first elastic member 41 is configured to drive the push rod 42 to push the first pilot valve core 31 to block the passage between the first pilot valve seat 32 and the pressure relief hole 14, the moving iron 51 is slidably guided to cooperate with the main valve chamber 11, and when the electromagnetic coil is energized, the moving iron 51 drives the second pilot valve core 33 to block the passage between the second pilot valve seat 34 and the pressure relief hole 14.

[0047] In the electromagnetic overflow valve, the pilot assembly 3 has two pilot valve cores, namely the first pilot valve core 31 and the second pilot valve core 33. When the electromagnetic assembly 5 is energized, the second pilot valve core 33 blocks the passage between the second pilot valve seat 34 and the pressure relief hole 14. At this time, the hydraulic oil at the oil inlet 12 enters the main valve chamber 11 through the damping hole of the main valve core 2 and is blocked by the first pilot valve core 31. As the oil pressure of the hydraulic oil at the oil inlet 12 increases, the first pilot valve core 31 is pushed and compresses the first elastic member 41. At this time, the hydraulic oil flows to the pressure relief hole 14 through the first pilot valve seat 32. 4 completes the pressure relief, so that a pressure difference is generated at both ends of the main valve core 2, and the main valve core 2 moves to connect the oil inlet 12 with the oil outlet 13 to achieve the overflow function; when the electromagnetic component 5 is powered off, the second pilot valve core 33 has no pressure on the second pilot valve seat 34, and the hydraulic oil at the oil inlet 12 enters the main valve chamber 11 through the damping hole of the main valve core 2, and flows to the pressure relief hole 14 through the second pilot valve seat 34 to complete the pressure relief, so that a pressure difference is generated at both ends of the main valve core 2, and the main valve core 2 moves to connect the oil inlet 12 with the oil outlet 13, avoiding excessive oil pressure due to power failure of the electromagnetic coil, reducing safety risks. Moreover, since the adjustment of the threshold of the electromagnetic overflow valve is completely dependent on the mechanical mechanism of the first pilot valve core 31, the first pilot valve seat 32 and the first elastic member 41, the accuracy and stability of flow control are greatly improved.

[0048] The electromagnetic overflow valve can avoid the failure of the overflow function due to the failure of the electromagnetic coil, thereby improving safety, and utilizes the mechanical structure to adjust the threshold value, thereby improving the accuracy and stability of flow control.

[0049] like Figure 2 to Figure 4 As shown, a stop iron 15 is arranged in the main valve sleeve 1, and the stop iron 15 has a first mounting hole 153 and a second mounting hole 154. The first pilot valve seat 32 is arranged in the first mounting hole 153, and the second pilot valve seat 34 is arranged in the second mounting hole 154 to ensure the stability of the first pilot valve seat 32 and the second pilot valve seat 34.

[0050] It is worth noting that the first mounting hole 153 and the second mounting hole 154 are both stepped holes. The first pilot valve seat 32 is installed from one end of the first mounting hole 153 and abuts against the stepped position, and the second pilot valve seat 34 is installed from one end of the second mounting hole 154 and abuts against the stepped position, which simplifies the assembly difficulty.

[0051] In this embodiment, the first mounting hole 153 and the second mounting hole 154 both penetrate the stop iron 15, the first pilot valve seat 32 is provided with a first connecting hole 321 connecting the main valve chamber 11 and the pressure relief hole 14, and the second pilot valve seat 34 is provided with a second connecting hole 341 connecting the main valve chamber 11 and the pressure relief hole 14, so that the hydraulic oil in the main valve chamber 11 can flow to the end of the stop iron 15 away from the main valve core 2. In order to make the main valve chamber 11 communicate with the pressure relief hole 14, the outer wall of the stop iron 15 is provided with a connecting platform 151 extending axially to both ends of the stop iron 15, and the connecting platform 151 is spaced apart from the inner wall of the main valve sleeve 1, and the main valve chamber 11 is connected with the pressure relief hole 14 through the connecting platform 151. The processing of the connecting platform 151 is simple, and only the surface of the stop iron 15 needs to be machined, and there is no need to set a separate connecting channel, which reduces the cost and simplifies the structure.

[0052] In this embodiment, the first pilot valve core 31 and the second pilot valve core 33 are both spherical valve cores, which can be well matched with the cylindrical first connecting hole 321 or the second connecting hole 341, thereby ensuring the reliability of blocking the first connecting hole 321 or the second connecting hole 341. In some embodiments, the first pilot valve core 31 and the second pilot valve core 33 can also be conical.

[0053] It is worth noting that when the electromagnetic coil is powered off, the moving iron 51 no longer generates driving force on the second pilot valve core 33. At this time, the hydraulic oil in the main valve chamber 11 can push the second pilot valve core 33 to disengage the second pilot valve core 33 from the second pilot valve seat 34. In order to prevent the moving iron 51 from blocking the movement of the second pilot valve core 33, a second elastic member 52 is provided in the main valve sleeve 1. The second elastic member 52 is configured to drive the moving iron 51 away from the second pilot valve seat 34. In other words, the second elastic member 52 abuts against the stopper iron 15 and the moving iron 51, thereby ensuring that the second pilot valve core 33 can be disengaged from the second pilot valve seat 34.

[0054] In this embodiment, in order to ensure a compact structure, the strokes of the first pilot valve core 31 and the second pilot valve core 33 are relatively short, the first pilot valve core 31 slides in the first communication hole 321, and the second pilot valve core 33 slides in the second communication hole 341. However, when the first pilot valve core 31 slides in the first communication hole 321, except when it is disengaged from the first pilot valve seat 32, other positions do not involve changes in flow, so the threshold of the electromagnetic overflow valve is adjusted.

[0055] like Figure 4As shown, in order to solve the above problem, the stopper 15 is provided with a third connecting hole 152, and the third connecting hole 152 is arranged at one end of the first pilot valve seat 32 away from the main valve core 2, and the two ends of the third connecting hole 152 are respectively opened at the inner wall of the first mounting hole 153 and the connecting platform 151. When the first pilot valve core 31 is disengaged from the first pilot valve seat 32, the hydraulic oil can flow to the third connecting hole 152 through the gap between the first pilot valve core 31 and the first connecting hole 321, and flow out of the stopper 15 through the third connecting hole 152. As the first pilot valve core 31 moves to the position of the third connecting hole 152, the flow area of ​​the third connecting hole 152 gradually increases, and the flow path of the hydraulic oil flowing through the third connecting hole 152 also gradually increases, thereby realizing the adjustment of the threshold value.

[0056] The threshold of the electromagnetic overflow valve depends on the driving force of the first elastic member 41 on the first pilot valve core 31. Figure 1 to Figure 3 As shown, in order to improve the applicability of the electromagnetic overflow valve, the electromagnetic overflow valve also includes a pressure regulating assembly 6, which is axially movably arranged on the main valve sleeve 1, and one end of the first elastic member 41 away from the push rod 42 abuts against the pressure regulating assembly 6.

[0057] That is to say, the operator can change the driving force of the first elastic member 41 on the first pilot valve core 31 by moving the pressure regulating assembly 6. When the pressure regulating assembly 6 moves toward the first pilot valve core 31, the threshold of the electromagnetic overflow valve increases. When the pressure regulating assembly 6 moves away from the first pilot valve core 31, the threshold of the electromagnetic overflow valve decreases.

[0058] Specifically, the pressure regulating assembly 6 includes an adjusting rod 61 and a locking nut 62. The adjusting rod 61 is inserted into the main valve sleeve 1 and is threadedly connected to the main valve sleeve 1. The locking nut 62 is sleeved on the adjusting rod 61 and can abut against the main valve sleeve 1. The adjusting rod 61 is rotated to move the adjusting rod 61 along the axial direction of the electromagnetic relief valve, thereby adjusting the driving force of the first elastic member 41 on the first pilot valve core 31. When the adjusting rod 61 is adjusted to a certain position, the locking nut 62 is rotated to abut against the main valve sleeve 1, so that the adjusting rod 61 can be locked, thereby ensuring that the threshold value of the electromagnetic relief valve does not change during use.

[0059] In this embodiment, a third elastic member 16 is further provided in the main valve sleeve 1, and the two ends of the third elastic member 16 abut against the stopper 15 and the main valve core 2 respectively, so as to drive the main valve core 2 to disconnect the oil inlet 12 and the oil outlet 13. The third elastic member 16 can provide a resisting force for the main valve core 2, so that the main valve core 2 can close the passage between the oil inlet 12 and the oil outlet 13, and define a threshold for opening the electromagnetic overflow valve, and at the same time can ensure the stability of the main valve core 2 during the movement.

[0060] like Figure 2 , Figure 3 and Figure 5As shown, the main valve core 2 includes a valve core body 21 and a damping member 22. The valve core body 21 is provided with a fixing hole. The damping member 22 includes a fixing section 222 and a connecting section 223. The damping member 22 is fixed in the fixing hole through the fixing section 222. The connecting section 223 is spaced apart from the inner wall of the fixing hole. The damping member 22 is provided with a first damping hole 221 and an oil hole 224. Both ends of the oil hole 224 are opened on the side wall of the connecting section 223. The first damping hole 221 is connected to the oil hole 224 and the main valve chamber 11.

[0061] The fixed section 222 is interference fit with the inner wall of the fixed hole to fix the damping element 22 in the fixed hole, and the gap between the connecting section 223 and the fixed hole can be used for the hydraulic oil to pass through, and enter the main valve chamber 11 through the oil hole 224 and the first damping hole 221 in turn, wherein the gap between the fixed section 222 and the inner wall of the fixed hole is smaller, and can play the role of increasing the flow resistance of the hydraulic oil like the first damping hole 221.

[0062] Specifically, the fixed hole includes a small diameter section 211, a transition section 212 and a large diameter section 213 connected in sequence, wherein the fixed section 222 is interference fit with the small diameter section 211 and abuts against the transition section 212 to form a seal, and the connecting section 223 and the large diameter section 213 are spaced apart to form a channel with a constant gap, thereby ensuring that the resistance of the main valve core 2 to the hydraulic oil remains stable.

[0063] Furthermore, the connecting section 223 is provided with an annular groove 225, and the oil hole 224 is provided in the annular groove 225. The setting of the annular groove 225 enables the hydraulic oil passing through the connecting section 223 and the large diameter section 213 to flow smoothly to the oil hole 224, and even if part of the gap is blocked, it does not affect the normal use of the electromagnetic overflow valve.

[0064] In this embodiment, when the electromagnetic coil is energized, the electromagnet exerts electromagnetic force on the second pilot valve core 33, and the first elastic member 41 exerts elastic force on the first pilot valve core 31. When the oil pressure of the hydraulic oil in the main valve chamber 11 is relatively low, the first pilot valve core 31 blocks the first connecting hole 321, and the second pilot valve core 33 blocks the second connecting hole 341. As the oil pressure of the hydraulic oil in the main valve chamber 11 gradually increases, it is necessary to ensure that the hydraulic oil first pushes the first pilot valve core 31 open and releases pressure through the first connecting hole 321, thereby ensuring the normal operation of the electromagnetic relief valve.

[0065] To achieve the above purpose, it is necessary to define some parameters of the electromagnetic overflow valve. In this embodiment, the cross-sectional area of ​​the first connecting hole 321 is S1, the cross-sectional area of ​​the second connecting hole 341 is S2, and the oil pressure of the hydraulic oil in the main valve chamber 11 is P. Then the pressure of the hydraulic oil on the first pilot valve core 31 is F1=P*S1, and the pressure of the hydraulic oil on the second pilot valve core 33 is F2=P*S2.

[0066] In this embodiment, the diameter of the first connecting hole 321 is greater than the diameter of the second connecting hole 341, that is, S1 is greater than S2, thereby ensuring that the driving force of the hydraulic oil on the first pilot valve core 31 is greater than the driving force of the hydraulic oil on the second pilot valve core 33, making it easier for the first pilot valve core 31 to be pushed by the hydraulic oil to relieve the pressure in the main valve chamber 11, thereby moving the main valve core 2, and connecting the oil inlet 12 and the oil outlet 13 to overflow.

[0067] Furthermore, a second damping hole 322 is provided in the first connecting hole 321, and the inner diameter of the second damping hole 322 is smaller than the inner diameter of the first connecting hole 321. The second damping hole 322 is provided so that when the hydraulic oil is released through the gap between the first pilot valve core 31 and the first pilot valve seat 32, the pressure of the hydraulic oil on the first pilot valve core 31 can be kept stable, and the first pilot valve core 31 will not vibrate due to rapid pressure release, thereby ensuring the stability of the threshold of the electromagnetic overflow valve.

[0068] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. An electromagnetic overflow valve, characterized in that: include: A main valve sleeve (1), the main valve sleeve (1) being provided with a main valve chamber (11) and an oil inlet (12), an oil outlet (13) and a pressure relief hole (14) which are connected to the main valve chamber (11); A main valve core (2) is slidably guided in the main valve sleeve (1), the main valve core (2) can connect or disconnect the oil inlet (12) and the oil outlet (13), the main valve core (2) has a first damping hole (221), and the first damping hole (221) connects the oil inlet (12) and the main valve chamber (11); A pilot assembly (3), comprising a first pilot valve core (31), a first pilot valve seat (32), a second pilot valve core (3) and a second pilot valve seat (34), wherein the first pilot valve seat (32) and the second pilot valve seat (34) are both capable of communicating with the main valve chamber (11) and the pressure relief hole (14); A push-up assembly (4), comprising a first elastic member (41) and a push rod (42), wherein the first elastic member (41) is configured to drive the push rod (42) to push up the first pilot valve core (31) to block a passage between the first pilot valve seat (32) and the pressure relief hole (14); The electromagnetic assembly (5) comprises an electromagnetic coil and a moving iron (51), wherein the moving iron (51) is slidably guided to fit in the main valve chamber (11), and when the electromagnetic coil is energized, the moving iron (51) drives the second pilot valve core (3) to block the passage between the second pilot valve seat (34) and the pressure relief hole (14).

2. The electromagnetic overflow valve according to claim 1, characterized in that: The first pilot valve seat (32) is provided with a first connecting hole (321) connecting the main valve chamber (11) and the pressure relief hole (14); the second pilot valve seat (34) is provided with a second connecting hole (341) connecting the main valve chamber (11) and the pressure relief hole (14); the diameter of the first connecting hole (321) is greater than the diameter of the second connecting hole (341).

3. The electromagnetic overflow valve according to claim 2, characterized in that: A second damping hole (322) is provided in the first connecting hole (321), and the inner diameter of the second damping hole (322) is smaller than the inner diameter of the first connecting hole (321).

4. The electromagnetic overflow valve according to claim 1, characterized in that: A second elastic member (52) is arranged in the main valve sleeve (1), and the second elastic member (52) is configured to drive the moving iron (51) away from the second pilot valve seat (34).

5. The electromagnetic overflow valve according to claim 1, characterized in that: The main valve sleeve (1) is provided with a stop iron (15) and a third elastic member (16), and the two ends of the third elastic member (16) respectively abut against the stop iron (15) and the main valve core (2) to drive the main valve core (2) to disconnect the oil inlet (12) and the oil outlet (13), and the first pilot valve seat (32) and the second pilot valve seat (34) are both fixedly arranged on the stop iron (15).

6. The electromagnetic overflow valve according to claim 5, characterized in that: The outer wall of the stop iron (15) is provided with a connecting platform (151) extending axially to both ends of the stop iron (15); the connecting platform (151) is spaced apart from the inner wall of the main valve sleeve (1); and the main valve chamber (11) is connected to the pressure relief hole (14) via the connecting platform (151).

7. The electromagnetic overflow valve according to claim 6, characterized in that: The stop iron (15) is provided with a third connecting hole (152) and a first mounting hole (153); the first pilot valve seat (32) is arranged in the first mounting hole (153); the third connecting hole (152) is arranged at an end of the first pilot valve seat (32) away from the main valve core (2); and the two ends of the third connecting hole (152) are respectively opened on the inner wall of the first mounting hole (153) and the connecting platform (151).

8. The electromagnetic overflow valve according to claim 1, characterized in that: The electromagnetic overflow valve further comprises a pressure regulating assembly (6), wherein the pressure regulating assembly (6) is axially movably arranged on the main valve sleeve (1), and one end of the first elastic member (41) away from the push rod (42) abuts against the pressure regulating assembly (6).

9. The electromagnetic overflow valve according to claim 1, characterized in that: The main valve core (2) comprises a valve core body (21) and a damping member (22), wherein the valve core body (21) is provided with a fixing hole, and the damping member (22) comprises a fixing section (222) and a connecting section (223), wherein the damping member (22) is fixedly arranged in the fixing hole through the fixing section (222), and the connecting section (223) is spaced apart from the inner wall of the fixing hole, and the damping member (22) is provided with the first damping hole (221) and an oil-passing hole (224), wherein both ends of the oil-passing hole (224) are arranged on the side wall of the connecting section (223), and the first damping hole (221) connects the oil-passing hole (224) and the main valve chamber (11).

10. The electromagnetic overflow valve according to claim 9, characterized in that: The connecting section (223) is provided with an annular groove (225), and the oil hole (224) is provided in the annular groove (225).

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