Pilot-operated type proportional pressure reducing valve

Abstract

The utility model relates to the technical field of hydraulic valves, in particular to a pilot-operated type proportional pressure reducing valve which comprises a valve body, and a first circulation hole and a second circulation hole are formed in the valve body. The valve sleeve is arranged in the valve body, the valve element is arranged in the valve body, and the valve element and the valve sleeve are coaxially arranged; the spring seat is arranged at the end part of the valve core; the sleeve is arranged between the valve sleeve and the spring seat, the two ends of the sleeve are arranged at the end of the valve sleeve and the end of the spring seat in a sleeving mode respectively, the sleeve is in clearance fit with the valve body, a through groove is formed in the side wall, facing the valve body, of the sleeve, and the through groove is communicated with the first circulation hole. The sleeve is used as a connecting piece between the valve sleeve and the spring seat, the through groove is formed in the outer side wall of the sleeve, and the through groove replaces a thin and long hole formed in the wall thickness to be communicated with the first circulation hole, so that the machining difficulty of the valve body is reduced; the sleeve serves as a connecting piece of the valve sleeve and the spring seat, flexibility is higher, interchangeability of parts is improved, and limitation of the space structure of the valve body is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic valve technical field especially relates to a pilot proportional pressure reducing valve. BACKGROUND

[0002] The pilot pressure reducing valve adopts the opening of the opening and closing member in the valve body cylinder to adjust the flow of the medium, reduces the pressure of the medium, adjusts the opening of the opening and closing member by the action of the pressure behind the valve, keeps the pressure behind the valve in a certain range, and achieves the purpose of stable output pressure.

[0003] In the pilot proportional pressure reducing valve, the proportional overflow valve part and the pressure reducing valve part are connected together through threads, wherein the valve sleeve of the proportional overflow valve is inserted in the valve body, a bevel hole is opened on the valve body, and an elongated hole is opened in the wall thickness of the valve body, the elongated hole and the bevel hole are communicated with each other, wherein the elongated hole is opened along the axial direction of the valve body, and since the space of the wall thickness of the valve body is limited, the processing difficulty of the elongated hole is high. And since the valve sleeve directly contacts with the valve body, the processing requirement of the matching part is high, if other specifications of valve sleeves need to be assembled, the valve body matched with them needs to be processed, and the assembly adaptability of this structure is low and not flexible. SUMMARY

[0004] The utility model aims at solving the problem that the valve body hole processing difficulty is high, and the assembly relationship between the valve sleeve and the valve body is low in flexibility.

[0005] Therefore, the utility model provides a pilot proportional pressure reducing valve.

[0006] The utility model solves the technical problems by adopting the technical scheme of:

[0007] A pilot proportional pressure reducing valve, comprising,

[0008] A valve body, the valve body is provided with a first flow-through hole and a second flow-through hole;

[0009] A valve sleeve, the valve sleeve is arranged in the valve body,

[0010] A valve core, the valve core is arranged in the valve body and coaxially arranged with the valve sleeve;

[0011] A spring seat, the spring seat is arranged at the end of the valve core;

[0012] A sleeve pipe, the sleeve pipe is arranged between the valve sleeve and the spring seat, both ends of the sleeve pipe are sleeved with the end of the valve sleeve and the end of the spring seat respectively, the sleeve pipe is gap-fitted with the valve body, a through groove is arranged on the side wall of the sleeve pipe towards the valve body, and the through groove is communicated with the first flow-through hole.

[0013] Further, the valve body is provided with a convex ring, the sleeve includes a first sleeve part and a second sleeve part, the first sleeve part is sleeved on the valve sleeve, the second sleeve part is sleeved on the spring seat, the outer diameter of the second sleeve part is smaller than that of the first sleeve part, and the second sleeve part is located at the convex ring.

[0014] Further, the spring seat is provided with an abutting surface, and the abutting surface abuts against the side wall of the convex ring away from the valve sleeve.

[0015] Further, the spring seat is inserted into the second sleeve part, and the spring seat is provided with a second embedding groove on the side wall close to the second sleeve part, and the second sealing ring is arranged in the second embedding groove.

[0016] Further, the valve sleeve is inserted into the first sleeve part, and the valve sleeve is provided with a first embedding groove on the side wall close to the first sleeve part, and the first sealing ring is arranged in the first embedding groove.

[0017] Further, the axial direction of the first flow-through hole and the axial direction of the second flow-through hole are inclined to the axial direction of the valve body.

[0018] Further, the axial direction of the first flow-through hole and the axial direction of the second flow-through hole are inclined to the axial direction of the valve body.

[0019] Further, the sleeve and the valve body are provided with an anti-rotation structure.

[0020] The utility model discloses a valve sleeve and spring seat are connected by the sleeve, and the sleeve is provided with a through groove on the outer side wall, and the through groove is communicated with the first flow-through hole and the elongated hole arranged in the wall thickness, on the one hand, the machining process of the valve body is avoided, and the machining difficulty of the valve body is reduced, on the other hand, the sleeve is used as the connecting piece of the valve sleeve and the spring seat, and the sleeve is more flexible, can be adapted by simple adjustment according to different specifications of the valve sleeve, the interchangeability of the part is improved, and the space structure of the valve body is limited. ACCURACY OF DRAWINGS

[0021] The utility model is further described below in combination with the drawings and examples.

[0022] Figure 1 It is the schematic diagram of the pilot proportional pressure reducing valve in the utility model.

[0023] Figure 2 It is Figure 1 The B part enlarged view of the through groove position in the utility model.

[0024] Figure 3 It is the structure schematic diagram of the sleeve in the utility model.

[0025] Figure 4It is the structural schematic view of the spring seat in the utility model.

[0026] In the drawing: 1, valve body; 10, elongated hole; 11, convex ring; 12, first flow-through hole; 13, second flow-through hole; 2, valve sleeve; 3, valve core; 31, damping hole; 4, sleeve; 41, first sleeve joint; 42, second sleeve joint; 43, through slot; 44, oil cavity; 5, spring seat; 51, abutment surface; 52, spring damping; 53, spring cavity; 61, first sealing ring; 62, second sealing ring. DETAILED DESCRIPTION

[0027] The utility model will be explained in further detail by combining with the drawings. These drawings are all simplified schematic views, just with the schematic way to show the basic structure of the utility model, therefore it just shows the structure related to the utility model.

[0028] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or position relation shown in the drawings, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the utility model. In addition, the features defined as "first", "second" can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0029] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, or detachable connection, or integrally connected, can be mechanical connection, or electrical connection, can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] Reference Figures 1-4 A pilot proportional pressure reducing valve, including valve body 1, valve sleeve 2, valve core 3, spring seat 5 and sleeve 4, valve sleeve 2, valve core 3 coaxial arrangement in valve body 1, valve core 3 is the pressure reducing valve part, and valve sleeve 2 is the proportional overflow valve part.

[0031] The spring seat 5 is arranged at one end of the valve core 3 towards the valve sleeve 2, and the other end of the valve core 3 is provided with a damping hole 31. The spring seat 5 is provided with a spring cavity 53, and the spring cavity 53 is provided with a spring damping 52. The spring damping 52 abuts against the spring seat 5. Specifically, the spring seat 5 is provided with a boss which is inserted into the valve core 3. The boss is provided with a sealing ring between the boss and the valve core 3.

[0032] The sleeve 4 is connected between the valve sleeve 2 and the spring seat 5. The outer diameter of the sleeve 4 is matched with the inner diameter of the valve body 1. The sleeve 4 includes a first sleeve part 41 and a second sleeve part 42. The first sleeve part 41 is sleeved at the end of the valve sleeve 2. The second sleeve part 42 is sleeved at the end of the spring seat 5.

[0033] It should be noted that, referring to Figure 2 , the valve body 1 is provided with a convex ring 11. The outer diameter of the second sleeve part 42 is smaller than the outer diameter of the second sleeve part 42. The second sleeve part 42 is located at the convex ring 11. The outer diameter of the second sleeve part 42 is smaller than the inner diameter of the convex ring 11. The outer diameter of the first sleeve part 41 is matched with the inner diameter of the valve body 1, so as to be closely matched with the valve body 1. The spring seat 5 is provided with an abutting surface 51 which abuts against the side wall of the convex ring 11 away from the valve sleeve 2, so as to limit the axial movement of the sleeve 4 and the spring seat 5 along the valve body 1.

[0034] The valve sleeve 2 and the first sleeve part 41 are provided with a first sealing ring 61. The spring seat 5 and the second sleeve part 42 are provided with a second sealing ring 62. The valve sleeve 2 and the spring seat 5 are provided with a first embedding groove for installing the first sealing ring 61 and a second embedding groove for installing the second sealing ring 62. The first embedding groove and the second embedding groove are both annular to prevent oil leakage. In the embodiment, the first sealing ring 61 and the second sealing ring 62 are both O-rings. The sealing effect between the sleeve 4 and the valve sleeve 2 is improved. The pressure in the oil cavity 44 in the valve sleeve 2 is stable. The performance of the pressure reducing valve is improved.

[0035] The valve body 1 is provided with a first flow-through hole 12 and a second flow-through hole 13 which penetrate the wall thickness of the valve body 1. The axial direction of the first flow-through hole 12 and the axial direction of the second flow-through hole 13 are obliquely arranged towards each other, so that there is an included angle between the axial direction of the first flow-through hole 12 and the axial direction of the second flow-through hole 13 and the axial direction of the valve body 1. The medium can flow better in the valve body. The liquid power can be reduced by different directions. The internal space of the valve body can be better utilized to avoid other components on the valve body. Figure 3 The outer side wall of the sleeve 4 is provided with a through groove 43 which communicates with the first flow-through hole 12. Anti-rotation structures such as anti-rotation bars can be arranged between the sleeve 4 and the valve body 1 to prevent the sleeve 4 from rotating relative to the valve body 1.

[0036] The valve core 3 is provided with an oil inlet P, the second flow hole 13 is an oil return port T, pressure oil enters from the oil inlet P, is decompressed through the valve port to the oil return port T, part of the pressure oil enters the spring cavity 53 in the spring sleeve of the valve core 3 and the spring sleeve through the damping hole 31, and then enters the oil cavity 44 in the valve sleeve 2 through the damping arranged in the spring seat 5, the pressure in the oil cavity 44 acts on the proportional overflow; the proportional overflow valve controls the force at the oil cavity 44 through electric current, under the combined action of hydraulic pressure and spring force, the valve core 3 reaches the unbalanced position, so that the valve output pressure is changed.

[0037] The utility model discloses the sleeve 4 is used as the connecting piece between valve sleeve 2 and valve core 3, and the through slot 43 on the outside wall of sleeve 4 is used to form the oil passing hole and the first flow hole 12 to communicate with the inner wall of valve body 1, so as to replace the scheme of processing the elongated hole 10 in the wall thickness of valve body 1 in the prior art, thereby reducing the machining difficulty of valve body 1. And sleeve 4 can be replaced according to the size of valve sleeve 2 and the inner diameter of valve body 1, thereby reducing the machining difficulty of related parts, improving the flexibility and interchangeability of parts.

[0038] With the above ideal embodiment of the utility model as the inspiration, through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined by the scope of claims.

Claims

1. A pilot-operated proportional pressure reducing valve, characterized in that, include, Valve body (1), wherein a first flow hole (12) and a second flow hole (13) are provided on the valve body (1); Valve sleeve (2), the valve sleeve (2) is disposed inside the valve body (1), Valve core (3), which is disposed inside the valve body (1) and coaxially disposed with the valve sleeve (2); A spring seat (5) is disposed at the end of the valve core (3); A sleeve (4) is provided between the valve sleeve (2) and the spring seat (5). The two ends of the sleeve (4) are respectively sleeved on the end of the valve sleeve (2) and the end of the spring seat (5). The sleeve (4) is clearance-fitted with the valve body (1). A through groove (43) is provided on the side wall of the sleeve (4) facing the valve body (1). The through groove (43) communicates with the first flow hole (12).

2. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that, The valve body (1) is provided with a convex ring (11), and the sleeve (4) includes a first sleeve part (41) and a second sleeve part (42). The first sleeve part (41) is sleeved on the valve sleeve (2), and the second sleeve part (42) is sleeved on the spring seat (5). The outer diameter of the second sleeve part (42) is smaller than the outer diameter of the first sleeve part (41), and the second sleeve part (42) is located at the convex ring (11).

3. The pilot-operated proportional pressure reducing valve according to claim 2, characterized in that, The spring seat (5) is provided with an abutment surface (51), which abuts against the side wall of the convex ring (11) away from the valve sleeve (2).

4. The pilot-operated proportional pressure reducing valve according to claim 2, characterized in that, The spring seat (5) is inserted into the second sleeve (42), and a second groove is provided on the side wall of the spring seat (5) close to the second sleeve (42), and a second sealing ring (62) is provided in the second groove.

5. The pilot-operated proportional pressure reducing valve according to claim 2, characterized in that, The valve sleeve (2) is inserted into the first sleeve portion (41), and the valve sleeve (2) is provided with a first groove on the side wall of the first sleeve portion (41) close to the first groove, and a first sealing ring (61) is provided in the first groove.

6. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that, The axial direction of the first flow hole (12) and the axial direction of the second flow hole (13) are both at an angle to the axial direction of the valve body (1).

7. The pilot-operated proportional pressure reducing valve according to claim 6, characterized in that, The axial direction of the first flow hole (12) and the axial direction of the second flow hole (13) are inclined toward each other.

8. The pilot-operated proportional pressure reducing valve according to claim 1, characterized in that, An anti-rotation structure is provided between the sleeve (4) and the valve body (1).

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