A direct acting relief valve

Abstract

The present invention belongs to the technical field of hydraulic oil distribution, and in particular to a direct-acting overflow valve. The following scheme is proposed, including a valve body and a valve core, a spring 1 is connected to the top of the valve core, and a sealing ring is also provided; a valve cavity is provided in the valve body, and an inlet and an outlet are provided on both sides of the valve cavity respectively; the valve core is provided with an upper core, a middle core and a lower core distributed from top to bottom, the outer walls of the upper core and the lower core are in sliding contact with the inner wall of the valve cavity, and the outer diameter of the middle core is smaller than the outer diameter of the upper core; the inner diameter of the sealing ring is larger than the outer diameter of the middle core, and the sealing ring is located between the upper core and the lower core. Under low pressure, the present invention improves the sealing effect of the valve core on the outlet by keeping the sealing ring in close contact with the upper core position at all times, and avoids the inlet pressure being unstable, causing the valve core to deviate, resulting in the liquid flowing out of the outer wall of the valve core, and affecting the use effect of the overflow valve.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic oil distribution, and in particular to a direct-acting overflow valve. Background Art

[0002] The direct-acting relief valve is an important component of the hydraulic system. Its main function is to maintain the stability of the oil pressure in the system and prevent the oil pressure from being too high and causing damage to the system.

[0003] With reference to a Chinese patent with patent announcement number CN222296597U, an externally controlled direct-acting relief valve is disclosed, comprising a relief valve body, the relief valve body comprising a valve body, a main valve core, a valve sleeve, a spring seat, a main spring, a nut, an adjusting screw and a locking nut; one end of the valve sleeve is threadedly connected to the valve body, and the other end is threadedly connected to the nut and the locking nut; the main valve core is placed in the valve body, and an oil inlet and an oil return port are provided at the end and side of the valve body; the adjusting screw is placed inside the nut and extends outwardly; a main spring chamber is formed between the valve body and the adjusting screw; one end of the main spring is pressed on the main valve core through the spring seat, and the other end is pressed on the adjusting screw; an external control port is provided at the connection between the valve sleeve and the valve body, connecting the outside of the relief valve body with the main spring chamber.

[0004] However, when the hydraulic pressure at the liquid inlet of a conventional direct-acting relief valve is small, the seal is achieved only by the close contact between the outer wall of the valve core and the inner wall of the valve body. During long-term use, the hydraulic pressure at the liquid inlet is unstable, and some liquid may easily flow out along the outer wall of the valve core, which will affect the use effect of the relief valve. Summary of the invention

[0005] Based on the technical problems of the background technology, the present invention proposes a direct-acting overflow valve.

[0006] A direct-acting overflow valve proposed in the present invention comprises a valve body and a valve core, a spring is connected to the top of the valve core, and also comprises a sealing ring; a valve cavity is opened in the valve body, and an inlet and an outlet are respectively arranged on both sides of the valve cavity; the valve core is provided with an upper core, a middle core and a lower core distributed from top to bottom, the outer walls of the upper core and the lower core are in sliding contact with the inner wall of the valve cavity, and the outer diameter of the middle core is smaller than the outer diameter of the upper core; the inner diameter of the sealing ring is larger than the outer diameter of the middle core, and the sealing ring is located between the upper core and the lower core.

[0007] Preferably, the outer wall of the sealing ring is in sliding contact with the inner wall of the valve cavity, and an installation groove is provided at a position of the inner wall of the valve cavity corresponding to the sealing ring. A vertically extending slide rail is fixed to the inner wall of the installation groove, and a slider is installed on the outer wall of the sealing ring and is limitedly slidably connected to the inner wall of the slide rail, and a spring 2 is connected between the slider and the inner wall of the slide rail.

[0008] Preferably, a limit plate slidably connected to the inner wall of the valve cavity is fixed at the top of the spring, an adjusting rod is rotatably connected to the middle position of the limit plate, a threaded hole is provided at the top of the valve body, the outer wall of the adjusting rod is threadedly connected to the threaded hole, a plurality of limit grooves are provided on the outer wall of the limit plate, a limit strip is fixed at a position corresponding to the limit groove on the inner wall of the valve cavity, and the outer wall of the limit strip is slidably connected to the inner wall of the limit groove.

[0009] Preferably, a through opening is provided at the top of the outlet, and an end of the through opening away from the outlet is communicated with the valve cavity.

[0010] Preferably, a connecting body 1 and a connecting body 2 are connected between the upper core and the middle core, the connecting body 1 is located close to the upper core, and the connecting body 2 is located close to the middle core, the outer diameter of the connecting body 1 gradually decreases from the upper core position toward the connecting body 2 position, and the outer diameter of the connecting body 2 gradually increases from the connecting body 1 position toward the middle core position.

[0011] Preferably, a through hole is provided at the center of the bottom end of the valve core, the through hole vertically extends upward to the top of the center core, and a plurality of horizontally penetrating circular holes are provided at positions corresponding to the center core on the inner side of the through hole.

[0012] Preferably, a plurality of horizontally penetrating circular holes 2 are provided at positions on the inner side of the through hole corresponding to the lower core.

[0013] Preferably, a plurality of pressure grooves connected to the through hole are formed at the bottom end of the valve core, the plurality of pressure grooves are distributed at equal distances at the bottom end of the valve core, and the inner diameters of the pressure grooves gradually increase downward.

[0014] Preferably, a plurality of annular grooves are formed on the outer wall of the central core, the ends of the circular holes 1 away from the through holes are connected to the annular grooves, and the circular holes 1 corresponding to two adjacent annular grooves are distributed in staggered intervals.

[0015] Preferably, a ring body is provided at the annular groove position, a plurality of grooves are opened on the outer wall of the ring body, the inner diameter of the ring body is larger than the inner diameter of the annular groove, the inner diameter of the ring body is smaller than the outer diameter of the core, and the vertical thickness of the ring body is smaller than the vertical width of the annular groove.

[0016] The beneficial effects of the present invention are:

[0017] 1. In the present invention, under low pressure, the sealing ring is always in close contact with the upper core position, thereby improving the sealing effect of the valve core on the outlet, avoiding the inlet pressure being unstable, causing the valve core to deviate, causing the liquid to flow out of the outer wall of the valve core, and affecting the use effect of the overflow valve.

[0018] 2. In the present invention, the incoming liquid is dispersed by the inclined surface structure of the first and second joint bodies, so that the upward thrust of the hydraulic pressure is evenly dispersed, thereby avoiding uneven pressure affecting the use effect.

[0019] 3. In the present invention, the oil is dispersed by means of distributed circular holes to improve the stability of the oil, and the upward thrust of the oil on the valve core is evenly dispersed through the pressure grooves distributed at equal distances below, so as to avoid deviation caused by uneven force on the valve core, thereby improving the use effect and working stability of the direct-acting relief valve during long-term use.

[0020] 4. In the present invention, the ring body can move horizontally during the liquid inlet process without completely blocking the circular hole in the ring groove. Therefore, the impact force of the liquid inlet is offset by the movement of the ring body, thereby effectively dispersing the liquid flow to ensure the stability of the force applied to the valve core and the anti-deviating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a direct-acting relief valve proposed by the present invention;

[0022] Figure 2 A schematic diagram of the internal structure of a valve body of a direct-acting relief valve proposed by the present invention;

[0023] Figure 3 A schematic diagram of the valve core state and structure of a direct-acting relief valve proposed by the present invention;

[0024] Figure 4 It is a structural schematic diagram of the valve core state 2 of a direct-acting relief valve proposed by the present invention;

[0025] Figure 5 A schematic diagram of the valve chamber structure of a direct-acting relief valve proposed by the present invention;

[0026] Figure 6 A schematic diagram of a slide rail structure of a direct-acting relief valve proposed by the present invention;

[0027] Figure 7 A schematic diagram of the structure of a limit plate of a direct-acting overflow valve proposed by the present invention;

[0028] Figure 8 A schematic diagram of the valve core structure of a direct-acting relief valve proposed by the present invention;

[0029] Fig. 9 This is a schematic diagram of the distribution structure of the circular hole 1 and the circular hole 2 of a direct-acting relief valve proposed by the present invention;

[0030] Fig.10 The present invention is a schematic diagram of a cross-sectional structure of a valve core of a direct-acting relief valve.

[0031] In the figure: 1 valve body, 101 valve cavity, 102 inlet, 103 outlet, 104 port;

[0032] 2 valve core, 21 upper core, 22 middle core, 221 ring groove, 222 round hole 1, 23 lower core, 231 pressure groove, 232 round hole 2, 24 joint body 1, 25 joint body 2, 26 through hole;

[0033] 3 sealing ring, 301 slider, 4 slide rail, 5 slide rod, 6 spring two;

[0034] 7 limiting plate, 701 limiting groove, 8 spring 1, 9 adjusting rod, 10 limiting strip;

[0035] 11 ring bodies, 111 grooves. DETAILED DESCRIPTION

[0036] Example 1: Reference Figure 1-Figure 8 , a direct-acting relief valve, comprising a valve body 1 and a valve core 2, a spring 8 is connected to the top of the valve core 2, and also comprises a sealing ring 3; a valve cavity 101 is opened in the valve body 1, and an inlet 102 and an outlet 103 are respectively arranged on both sides of the valve cavity 101, that is, an inlet 102 is arranged on one side of the valve cavity 101, and an outlet 103 is arranged on the other side of the valve cavity 101, and the outlet 103 is located above the inlet 102; the valve core 2 is provided with an upper core 21, a middle core 22 and a lower core 23 distributed from top to bottom, the outer walls of the upper core 21 and the lower core 23 are in sliding contact with the inner wall of the valve cavity 101, and the outer diameter of the middle core 22 is smaller than the outer diameter of the upper core 21; the outer wall of the sealing ring 3 is in contact with the inner wall of the valve cavity 101, the inner diameter of the sealing ring 3 is larger than the outer diameter of the middle core 22, and the sealing ring 3 is located between the upper core 21 and the lower core 23; it should be noted that: Figure 3 The valve core 2 state 1 is shown as the inlet 102 is in a low pressure state, the bottom of the upper core 21 is in close contact with the top of the sealing ring 3 under the force of the spring 18, and the outer side of the upper core 21 blocks the outlet 103, and the inlet 102 and the outlet 103 are disconnected when the inlet 102 is in a low pressure state;

[0037] like Figure 4 The second state of the valve core 2 shown is that the inlet 102 is in a high pressure state, and the valve core 2 moves upward, so that the inlet 102 and the outlet 103 are connected with the valve cavity 101, so that the liquid oil can flow;

[0038] Therefore, under low pressure conditions, the sealing ring 3 and the upper core 21 are in close contact with each other, thereby improving the sealing effect of the valve core 2 on the outlet 103, avoiding the inlet 102 pressure instability causing the valve core 2 to deviate, resulting in liquid flowing out of the outer wall of the valve core 2 and affecting the use effect of the overflow valve.

[0039] In the present invention, the outer wall of the sealing ring 3 is in sliding contact with the inner wall of the valve cavity 101, and an installation groove is provided at a position corresponding to the inner wall of the valve cavity 101 and the sealing ring 3, and a vertically extending slide rail 4 is fixed on the inner wall of the installation groove, and a slider 301 is installed on the outer wall of the sealing ring 3 and is limitedly slidably connected with the inner wall of the slide rail 4, and a spring 26 is connected between the slider 301 and the inner wall of the slide rail 4. It should be noted that: a vertically extending slide rod 5 is fixed in the slide rail 4, and a perforation is provided on the slider 301, and the inner wall of the perforation is slidably connected with the outer wall of the slide rod 5, so that the sealing ring 3 can slide along the slide rail 4 through the slider 301; when there is no water in the inlet 102: the valve core 2 is lowered to the bottom end of the valve cavity 101 by the spring 18, at this time, the inlet 102 corresponds to the outer side of the middle core 22, the outlet 103 is completely blocked by the upper core 21 and the bottom end of the upper core 21 is below the outlet 103, and at the same time, the outer wall of the bottom of the upper core 21 is tightly connected with the top outer wall of the sealing ring 3, and the spring 26 is in a compressed state;

[0040] When the inlet 102 is under low pressure, the valve core 2 may be in a completely immobile state, which is the same as the case where there is no water in the inlet 102; or the valve core 2 presses the spring 1 8 upward by a short distance, and the valve core 2 moves upward by a short distance, and its outer wall always blocks the outlet 103, and under the action of the spring 2 6, the sealing ring 3 can move upward with it, so that the top of the sealing ring 3 is always in close contact with the bottom outer wall of the upper core 21, so that the movable setting of the sealing ring 3 can always improve the blocking effect of the valve core 2 on the position of the outlet 103 under the low pressure state of the inlet 102, so as to ensure the effectiveness of the long-term use of the overflow valve;

[0041] When the liquid inlet 102 is under high pressure, the maximum rising distance of the sealing ring 3 is when the top outer wall of the sealing ring 3 is close to the bottom of the outlet 103. At this time, the bottom outer wall of the upper core 21 will be separated from the top outer wall of the sealing ring 3, so that the outlet 103 is connected with the valve cavity 101.

[0042] In the present invention, a limit plate 7 which is slidably connected to the inner wall of the valve cavity 101 is fixed at the top of the spring 8, a rotating hole is provided in the middle position of the limit plate 7, and an adjusting rod 9 is rotatably connected to the inner wall of the rotating hole, a threaded hole is provided at the top of the valve body 1, and the outer wall of the adjusting rod 9 is threadedly connected to the threaded hole, a plurality of limit grooves 701 are provided on the outer wall of the limit plate 7, and the limit grooves 701 are vertically penetrated, and a limit strip 10 is fixed at a position corresponding to the inner wall of the valve cavity 101 and the limit groove 701, and the outer wall of the limit strip 10 is slidably connected to the inner wall of the limit groove 701, and the position of the limit plate 7 is pre-adjusted by threading the adjusting rod 9 with the top of the valve body 1, thereby adjusting the extrusion force of the spring 8 on the valve core 2.

[0043] In the present invention, a through hole 104 is opened at the top of the outlet 103, and the end of the through hole 104 away from the outlet 103 is connected to the valve cavity 101. When the inlet 102 is in a low pressure state, the top of the through hole 104 is located above the top outer wall of the valve core 2. When the inlet 102 is in a high pressure state, the through hole 104 can be used to lead the liquid flowing into the top of the valve core 2 or the liquid flow on the outer wall of the upper core 21 to the outlet 103.

[0044] In the present invention, a connecting body 1 24 and a connecting body 25 are connected between the upper core 21 and the middle core 22. The connecting body 1 24 is located near the upper core 21, and the connecting body 25 is located near the middle core 22. The two ends of the connecting body 1 24 are respectively connected to the upper core 21 and the middle core 22, and the two ends of the connecting body 25 are respectively connected to the connecting body 1 24 and the middle core 22. The outer diameter of the connecting body 1 24 gradually decreases from the position of the upper core 21 toward the position of the connecting body 25, and the outer diameter of the connecting body 25 gradually decreases from the position of the upper core 21 to the position of the connecting body 25. The position of the body 1 24 gradually increases toward the position of the center core 22. It should be noted that the outer diameter of the end of the body 1 24 close to the upper core 21 is smaller than the outer diameter of the upper core 21 to ensure the fitting effect of the sealing ring 3 and the bottom of the upper core 21, and the inclined surface structure of the body 1 24 and the body 2 25 is used to disperse the incoming liquid, so that the upward thrust of the hydraulic pressure is evenly dispersed to avoid uneven pressure affecting the use effect, and the outer diameter of the body 2 25 close to the end of the center core 22 is equal to the outer diameter of the center core 22.

[0045] Example 2: Reference Figure 1-Figure 10A direct-acting relief valve is provided. On the basis of Example 1, a through hole 26 is provided at the center of the bottom end of the valve core 2. The through hole 26 extends vertically upward to the top of the center core 22. A plurality of horizontally penetrating circular holes 222 are provided at the position corresponding to the center core 22 on the inner side of the through hole 26. A plurality of horizontally penetrating circular holes 232 are provided at the position corresponding to the lower core 23 on the inner side of the through hole 26. A plurality of pressure grooves 231 connected to the through hole 26 are provided at the bottom end of the valve core 2. The plurality of pressure grooves 231 are distributed at equal distances at the bottom end of the valve core 2. It should be noted that the pressure groove 231 located at the center of the bottom end of the valve core 2 is connected to the bottom end of the through hole 26, while the pressure grooves 231 distributed at other positions are directly connected to the circular hole 232 to achieve the connection operation with the through hole 26. The pressure groove The inner diameter of 231 gradually increases downward. During use, the oil entering from the inlet 102 can flow around the periphery of the central core 22, and the oil can enter the circular hole 232 and the pressure groove 231 along the circular hole 1 222 and the through hole 26. The oil pushes the position of the joint 1 24 and the pressure groove 231 to apply force to the valve core 2 upward. On the one hand, the normal operation of the direct-acting relief valve is guaranteed. On the other hand, the oil is dispersed by the distributed circular hole 232 to improve the stability of the oil. The upward thrust of the oil on the valve core 2 is evenly dispersed through the pressure grooves 231 equidistantly distributed below, so as to avoid uneven force on the valve core 2 and cause deviation, thereby improving the use effect and working stability of the direct-acting relief valve during long-term use.

[0046] In the present invention, a plurality of annular grooves 221 are formed on the outer wall of the center core 22, and the end of the circular hole 222 away from the through hole 26 is connected to the annular groove 221, and the circular holes 222 corresponding to two adjacent annular grooves 221 are arranged at staggered intervals, so that the oil entering from the inlet 102 is dispersed along the plurality of annular grooves 221 and gathered in the through hole 26, so as to offset the impact force of the incoming liquid and ensure the uniformity and stability of the force applied by the oil to push the valve core 2 upward.

[0047] In the present invention, a ring body 11 is arranged at the position of the annular groove 221, and a plurality of grooves 111 are provided on the outer wall of the ring body 11. The inner diameter of the ring body 11 is larger than the inner diameter of the annular groove 221, and the inner diameter of the ring body 11 is smaller than the outer diameter of the center core 22. The vertical thickness of the ring body 11 is smaller than the vertical width of the annular groove 221, so that the ring body 11 can rotate in the annular groove 221 or shift in the horizontal direction, but the ring body 11 will not detach from the annular groove 221, so that the ring body 11 can move horizontally during the liquid inlet process, and will not cause complete blockage to the circular hole 222 in the annular groove 221, so that the impact force of the liquid inlet is offset by the movement of the ring body 11, thereby effectively dispersing the liquid flow to ensure the stability and anti-deviating effect of the force applied to the valve core 2.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A direct-acting relief valve, comprising a valve body (1) and a valve core (2), wherein a spring (8) is connected above the valve core (2), and characterized in that: Also includes a sealing ring (3); The valve body (1) has a valve cavity (101) formed therein, and an inlet (102) and an outlet (103) are respectively provided on two sides of the valve cavity (101); The valve core (2) is provided with an upper core (21), a middle core (22) and a lower core (23) which are distributed from top to bottom, the outer walls of the upper core (21) and the lower core (23) are in sliding contact with the inner wall of the valve cavity (101), and the outer diameter of the middle core (22) is smaller than the outer diameter of the upper core (21); The inner diameter of the sealing ring (3) is greater than the outer diameter of the middle core (22); the sealing ring (3) is located between the upper core (21) and the lower core (23); the outer wall of the middle core (22) is provided with a plurality of annular grooves (221); a ring body (11) is arranged at the position of the annular grooves (221); the outer wall of the ring body (11) is provided with a plurality of grooves (111); the inner diameter of the ring body (11) is greater than the inner diameter of the annular grooves (221); the inner diameter of the ring body (11) is smaller than the outer diameter of the middle core (22); and the vertical thickness of the ring body (11) is smaller than the thickness of the annular grooves (221). 221), the outer wall of the sealing ring (3) is in sliding contact with the inner wall of the valve cavity (101), a mounting groove is provided at a position corresponding to the inner wall of the valve cavity (101) and the sealing ring (3), a vertically extending slide rail (4) is fixed to the inner wall of the mounting groove, a slider (301) is installed on the outer wall of the sealing ring (3) and is limitedly slidably connected to the inner wall of the slide rail (4), a spring 2 (6) is connected between the slider (301) and the inner wall of the slide rail (4), and the sealing ring (3) is always in close contact with the upper core (21) under low pressure.

2. A direct-acting relief valve according to claim 1, characterized in that: A limit plate (7) is fixed at the top end of the spring 1 (8) and is slidably connected to the inner wall of the valve cavity (101); an adjusting rod (9) is rotatably connected to the middle position of the limit plate (7); a threaded hole is provided at the top end of the valve body (1); an outer wall of the adjusting rod (9) is threadedly connected to the threaded hole; a plurality of limit grooves (701) are provided on the outer wall of the limit plate (7); a limit strip (10) is fixed at a position corresponding to the inner wall of the valve cavity (101) and the limit grooves (701); and the outer wall of the limit strip (10) is slidably connected to the inner wall of the limit groove (701).

3. A direct-acting relief valve according to claim 1, characterized in that: A through opening (104) is provided at the top of the outlet (103), and an end of the through opening (104) away from the outlet (103) is in communication with the inside of the valve cavity (101).

4. A direct-acting relief valve according to any one of claims 1 to 3, characterized in that: A connecting body 1 (24) and a connecting body 2 (25) are connected between the upper core (21) and the middle core (22); the connecting body 1 (24) is located near the upper core (21), and the connecting body 2 (25) is located near the middle core (22); the outer diameter of the connecting body 1 (24) gradually decreases from the position of the upper core (21) toward the position of the connecting body 2 (25), and the outer diameter of the connecting body 2 (25) gradually increases from the position of the connecting body 1 (24) toward the position of the middle core (22).

5. A direct-acting relief valve according to any one of claims 1 to 3, characterized in that: A through hole (26) is provided at the center of the bottom end of the valve core (2), and the through hole (26) extends vertically upward to the top of the center core (22). A plurality of horizontally penetrating circular holes (222) are provided at positions inside the through hole (26) corresponding to the center core (22).

6. A direct-acting relief valve according to claim 5, characterized in that: A plurality of horizontally penetrating circular holes (232) are provided at positions inside the through hole (26) corresponding to the lower core (23).

7. A direct-acting relief valve according to claim 6, characterized in that: The bottom end of the valve core (2) is provided with a plurality of pressure grooves (231) connected to the through hole (26); the plurality of pressure grooves (231) are distributed at equal distances at the bottom end of the valve core (2); and the inner diameter of the pressure grooves (231) gradually increases downwards.

8. A direct-acting relief valve according to claim 7, characterized in that: The end of the circular hole 1 (222) away from the through hole (26) is connected to the annular groove (221), and the circular holes 1 (222) corresponding to two adjacent annular grooves (221) are arranged in a staggered manner.

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