Pressure stop valve structure of A11V plunger pump

Abstract

The utility model relates to a pressure stop valve structure of an A11V plunger pump. The technical problem that an existing plunger pump is short in service life is solved. Comprising a valve body provided with an axially-arranged valve element installation cavity, a valve element is movably arranged in the valve element installation cavity and is of an integrated structure, the circumferential outer side of the valve element is connected with the valve element installation cavity in a sealed and sliding mode through a sealing assembly, and a pressure adjusting assembly which is coaxial with the valve element and acts on one end of the valve element is arranged in the valve body. An oil inlet structure vertically extending into the valve element mounting cavity is arranged in the valve body and communicates with one end of an oil inlet channel axially arranged in the valve element, and the other end of the oil inlet channel is connected with a pushing cavity which is located between the other end of the valve element and the valve element mounting cavity and can push the valve element to move in the direction of the pressure adjusting assembly. The pressure stop valve has the advantages that the matching quality of a friction pair of the valve element and the valve element mounting cavity is improved, the reaction sensitivity of the pressure stop valve is improved, and the service life of the whole pump is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic valve equipment, and in particular relates to an A11V plunger pump pressure cut-off valve structure. Background Art

[0002] like Figure 1 As shown in the figure, the pressure cut-off valve used in the existing A11V series uses the principle of area difference for constant pressure control, so its structure is a two-section type. Due to its high requirements for coaxiality and cylindricity, when machining the valve core and valve core hole, the machining tools and processes are required to be high, and it is difficult to meet the requirements at the same time. The basic function can only be achieved by increasing the gap and reducing the performance. However, as the gap increases, the leakage increases, resulting in slow pressure cut-off response and inability to completely cut off; at the same time, the increase in the gap leads to uneven distribution of the oil film of the friction pair, accelerating the wear of the friction pair, thereby affecting the service life of the plunger pump. Summary of the invention

[0003] The utility model aims to solve the above problems and provides an A11V plunger pump pressure cut-off valve structure.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: the A11V plunger pump pressure cut-off valve structure comprises a valve body with an axially arranged valve core installation cavity, a valve core is movably arranged in the valve core installation cavity, the valve core is an integrated structure and the circumferential outer side of the valve core is sealingly and slidingly connected with the valve core installation cavity through a sealing component, and a pressure regulating component is provided in the valve body coaxially arranged with the valve core and acting on one end of the valve core, an oil inlet structure is provided in the valve body vertically extending into the valve core installation cavity, the oil inlet structure is connected to one end of the oil inlet channel axially arranged in the valve core, and the other end of the oil inlet channel is connected to a push cavity located between the other end of the valve core and the valve core installation cavity and capable of pushing the valve core to move toward the direction of the pressure regulating component, the pressure in the valve body can be adjusted by the pressure regulating component, and the hydraulic oil flows into the push cavity through the oil inlet structure to push the valve core to move.

[0005] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the pressure regulating assembly includes a pressure regulating chamber coaxially arranged with the valve core mounting chamber, an adjusting mounting seat is provided on one side of the valve body, the adjusting mounting seat abuts against the valve body on the circumferential outer side, and one end of the adjusting mounting seat is extended and arranged in the pressure regulating chamber, and an elastic reset assembly connected to the pressure regulating chamber is provided in the adjusting mounting seat, an adjusting screw penetrating through the adjusting mounting seat and abutting against the elastic reset assembly is provided at one end of the adjusting mounting seat away from the valve body, and a sealing nut abutting against the adjusting mounting seat is provided on the other end of the adjusting screw, and the sealing nut can be used to fix the adjusting screw in the adjustment state.

[0006] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the elastic reset assembly includes an elastic mounting cavity arranged in the adjusting mounting seat, the elastic mounting cavity has relatively arranged spring mounting seats, and the relatively arranged spring mounting seats are connected by a reset spring. The elastic mounting cavity can facilitate the placement of the spring mounting seat, and the spring mounting seat can facilitate the installation of the reset spring, thereby improving the installation efficiency.

[0007] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the ends of the relatively arranged spring mounting seats that are away from each other are provided with conical grooves, and the end of the spring mounting seat close to the adjusting screw abuts against the adjusting screw through the conical groove, and the end of the spring mounting seat close to the valve core abuts against the valve core through another conical groove. One end of the valve core abuts against the conical groove, which can further improve the connection stability between the valve core and the spring mounting seat.

[0008] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the sealing assembly includes a plurality of sealing rings arranged on the circumferential outer side of the valve core, the sealing rings are respectively arranged on both sides of the middle of the valve core, and there is an oil chamber arranged in the valve core installation chamber between the sealing rings, and the oil chamber is connected to the oil inlet structure 5.

[0009] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the oil inlet structure 5 includes an oil inlet pipeline vertically arranged on one side of the valve body and connected to the oil chamber, the valve core is provided with an oil inlet hole connected to the oil inlet channel, and the oil inlet pipeline is connected to the oil inlet hole through the oil chamber.

[0010] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the oil inlet hole is radially arranged on the outside of the valve core and the push chamber and the oil inlet pipeline are connected through the oil inlet hole and the oil inlet channel, and the hydraulic oil flows into the push chamber through the oil inlet hole and the oil inlet channel, and the hydraulic oil pushes the valve core to move in the push chamber.

[0011] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the oil inlet hole is arranged in the middle of the valve core, and the length of the oil inlet channel is not less than half of the total length of the valve core.

[0012] In the above-mentioned A11V plunger pump pressure cut-off valve structure, the valve core is cylindrical, and a conical pushing portion is provided at one end of the valve core, the conical pushing portion abuts against a conical groove at one end of the spring mounting seat, and the conical pushing portion can drive the spring mounting seat to be compressed, and the spring mounting seat can drive the valve core to reset through a reset spring.

[0013] In the above-mentioned A11V plunger pump pressure cut-off valve structure, an oil unloading pipeline is provided on one side of the valve body. The oil unloading pipeline is vertically extended and one end is connected to the pressure regulating chamber, and the other end of the oil unloading pipeline is connected to the constant power valve spring chamber arranged in the valve body. The oil unloading pipeline can solve the oil return problem of the pressure regulating chamber after changing the valve core.

[0014] Compared with the existing technology, the advantages of the utility model are:

[0015] 1. It can facilitate the processing of the valve core and the valve core installation cavity, improve the processing efficiency, and ensure the cylindricity of the valve core.

[0016] 2. The matching quality of the friction pair between the valve core and the valve core installation cavity is improved, thereby improving the response sensitivity of the pressure cut-off valve and the service life of the entire pump.

[0017] 3. The sealing component can ensure the sealing effect of the oil chamber and the pressure cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the prior art.

[0019] Figure 2 It is a structural schematic diagram of the utility model.

[0020] Figure 3 It is a structural schematic diagram of the valve core in the utility model.

[0021] In the figure: valve body 1, valve core installation cavity 11, oil unloading pipeline 12, valve core 2, oil inlet channel 21, push cavity 22, conical push part 23, sealing assembly 3, sealing ring 31, oil cavity 32, pressure regulating assembly 4, pressure regulating cavity 41, adjusting mounting seat 42, adjusting screw 43, sealing nut 44, oil inlet structure 5, oil inlet pipeline 51, oil inlet hole 52, elastic reset assembly 6, elastic mounting cavity 61, spring mounting seat 62, conical groove 621, reset spring 63. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 2 , Figure 3As shown, the A11V plunger pump pressure cut-off valve structure comprises a valve body 1 having an axially arranged valve core installation cavity 11, a valve core 2 is movably arranged in the valve core installation cavity 11, the valve core 2 is axially arranged in the valve core installation cavity 11, the valve core 2 is an integrated structure and the outer side of the valve core 2 is sealed and slidably connected to the valve core installation cavity 11 through a sealing component 3, the integrated structure can ensure the overall strength of the valve core 2 and improve the service life of the valve core 2, and a pressure regulating member coaxially arranged with the valve core 2 and acting on one end of the valve core 2 is provided in the valve body 1. Component 4, an oil inlet structure 5 is provided in the valve body 1 and extends vertically to the valve core installation cavity 11, the oil inlet structure 5 is connected to one end of an oil inlet channel 21 axially arranged in the valve core 2, and the other end of the oil inlet channel 21 is connected to a push cavity 22 located between the other end of the valve core 2 and the valve core installation cavity 11 and capable of pushing the valve core 2 to move toward the direction of the pressure regulating component 4, the pressure in the valve body 1 can be adjusted by the pressure regulating component 4, and the hydraulic oil flowing into the push cavity 22 through the oil inlet structure 5 can push the valve core 2 to move.

[0024] Specifically, the pressure regulating assembly 4 includes a pressure regulating chamber 41 which is coaxially arranged with the valve core mounting chamber 11. The size of the pressure regulating chamber 41 is larger than that of the valve core mounting chamber 11. An adjusting mounting seat 42 is provided on one side of the valve body 1. The adjusting mounting seat 42 abuts against the valve body 1 on the circumferential outer side, and one end of the adjusting mounting seat 42 extends in the pressure regulating chamber 41. The adjusting mounting seat 42 is fixedly arranged on the valve body 1, and an elastic reset assembly 6 which is connected to the pressure regulating chamber 41 is provided in the adjusting mounting seat 42. The valve core 2 can be driven to reset by the elastic reset assembly 6. An adjusting screw 43 which passes through the adjusting mounting seat 42 and abuts against the elastic reset assembly 6 is provided at one end of the adjusting mounting seat 42 away from the valve body 1. The pressure in the valve body 1 can be adjusted by the adjusting screw 43. A sealing nut 44 is sleeved on the other end of the adjusting screw 43 and abuts against the adjusting mounting seat 42. The sealing nut 44 can fix the adjusting screw 43 in the adjustment.

[0025] Among them, the elastic reset component 6 includes an elastic mounting cavity 61 arranged in the adjusting mounting seat 42, the size of the elastic mounting cavity 61 is smaller than the size of the pressure regulating cavity 41, and there is a relatively arranged spring mounting seat 62 in the elastic mounting cavity 61, and the relatively arranged spring mounting seats 62 are connected by a reset spring 63. The spring mounting seat 62 can be easily placed through the elastic mounting cavity 62, and the reset spring 63 can be easily installed through the spring mounting seat 62, thereby improving the installation efficiency.

[0026] like Figure 2 , Figure 3As shown, the ends of the relatively arranged spring mounting seats 62 that are away from each other are both provided with tapered grooves 621, and the structures of the tapered grooves 621 at both ends are consistent in size, and can facilitate the processing of the tapered grooves 621, thereby improving the processing efficiency of the tapered grooves 621. The end of the spring mounting seat 62 close to the adjusting screw 43 abuts against the adjusting screw 43 through the tapered groove 621, and the connection stability between the adjusting screw 43 and the spring mounting seat 62 can be improved through the tapered groove 621. The end of the spring mounting seat 62 close to the valve core 2 abuts against the valve core 2 through another tapered groove 621, and one end of the valve core 2 abuts against the valve core 2 in the tapered groove 621, which can further improve the connection stability between the valve core 2 and the spring mounting seat 62.

[0027] Furthermore, the sealing assembly 3 includes a plurality of sealing rings 31 arranged on the circumferential outer side of the valve core 2. The circumferential outer side of the sealing ring 31 abuts against the valve core installation cavity 11 to ensure the sealing effect, and the sealing rings 31 are respectively arranged on both sides of the middle part of the valve core 2, and there is an oil cavity 32 arranged in the valve core installation cavity 11 between the sealing rings 31. The oil cavity 32 is closed by the sealing ring 31 to ensure the pressure cutting effect and the sealing effect in the oil cavity 32. The oil cavity 32 is connected to the oil inlet structure 5, and the hydraulic oil can be set in the oil cavity 32 through the oil inlet structure 5.

[0028] Among them, the oil inlet structure 5 includes an oil inlet pipeline 51 vertically arranged on one side of the valve body 1 and connected to the oil chamber 32, hydraulic oil is arranged in the oil inlet pipeline 51, and an oil inlet hole 52 connected to the oil inlet channel 21 is arranged on the valve core 2. The oil inlet pipeline 51 is connected to the oil inlet hole 52 through the oil chamber 32, and the hydraulic oil is connected to the oil inlet hole 52 through the oil chamber 32.

[0029] Combination Figure 2 , Figure 3 As shown, the oil inlet hole 52 is radially arranged on the outside of the valve core 2, and the push chamber 22 and the oil inlet pipeline 51 are connected through the oil inlet hole 52 and the oil inlet channel 21, and the hydraulic oil flows into the push chamber 22 through the oil inlet hole 52 and the oil inlet channel 21, and the hydraulic oil pushes the valve core 2 to move in the push chamber 22.

[0030] The oil inlet hole 52 is arranged in the middle of the valve core 2 , and the length of the oil inlet channel 21 is not less than half of the total length of the valve core 2 .

[0031] Specifically, the valve core 2 is cylindrical, which can facilitate the processing of the valve core installation cavity 11 and improve the processing efficiency, and a conical pushing portion 23 is provided at one end of the valve core 2, and the conical pushing portion 23 is arranged corresponding to the conical groove 621. The conical pushing portion 23 is abutted against the conical groove 621 at one end of the spring mounting seat 62, and the conical pushing portion 23 can drive the spring mounting seat 62 to be compressed, and the spring mounting seat 62 can drive the valve core 2 to be reset through the reset spring 63.

[0032] Combination Figure 2 As shown, an oil unloading pipeline 12 is provided on one side of the valve body 1. The oil unloading pipeline 12 is vertically extended and one end is connected to the pressure regulating chamber 41, and the other end of the oil unloading pipeline 12 is connected to the constant power valve spring chamber arranged in the valve body 1. The oil unloading pipeline 12 can solve the oil return problem of the pressure regulating chamber 41 after the valve core 2 is changed.

[0033] The principle of this embodiment is that the oil inlet structure 5 is connected with the push chamber 22 through the oil inlet channel 21 of the valve core 2, and the hydraulic oil flows to the push chamber 22 through the oil inlet structure 5 and pushes the valve core 2 to move toward one end of the pressure regulating component 4, and the pressure regulating chamber 41 is connected to the oil unloading pipeline 12, and the other end of the oil unloading pipeline 12 is connected to the constant power valve spring chamber in the valve body 1, which enables the pressure regulating component 4 to drive the valve core 2 to reset, and the valve core 2 is an integrated structure and is cylindrical, which can facilitate the processing of the valve core 2 and the valve core installation chamber 11, thereby improving the processing efficiency.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although the terms valve body 1, valve core installation cavity 11, oil unloading pipeline 12, valve core 2, oil inlet passage 21, push cavity 22, conical push part 23, sealing assembly 3, sealing ring 31, oil cavity 32, pressure regulating assembly 4, pressure regulating cavity 41, adjusting mounting seat 42, adjusting screw 43, sealing nut 44, oil inlet structure 5, oil inlet pipeline 51, oil inlet hole 52, elastic reset assembly 6, elastic installation cavity 61, spring mounting seat 62, conical groove 621, reset spring 63 and the like are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An A11V plunger pump pressure cut-off valve structure, comprising a valve body (1) having an axially arranged valve core installation cavity (11), wherein a valve core (2) is movably arranged in the valve core installation cavity (11), characterized in that: The valve core (2) is an integrated structure and the outer side of the valve core (2) is sealingly and slidably connected to the valve core installation cavity (11) through a sealing component (3), and a pressure regulating component (4) is provided in the valve body (1) and is coaxially arranged with the valve core (2) and acts on one end of the valve core (2). The valve body (1) is provided with an oil inlet structure (5) extending vertically into the valve core installation cavity (11), and the oil inlet structure (5) is connected to one end of an oil inlet channel (21) axially arranged in the valve core (2), and the other end of the oil inlet channel (21) is connected to a pushing cavity (22) located between the other end of the valve core (2) and the valve core installation cavity (11) and capable of pushing the valve core (2) to move toward the pressure regulating component (4).

2. The A11V plunger pump pressure cut-off valve structure according to claim 1, characterized in that: The pressure regulating assembly (4) comprises a pressure regulating chamber (41) coaxially arranged with the valve core mounting chamber (11); an adjusting mounting seat (42) is arranged on one side of the valve body (1); the adjusting mounting seat (42) abuts against the valve body (1) on the circumferential outer side; one end of the adjusting mounting seat (42) extends into the pressure regulating chamber (41); an elastic reset assembly (6) connected to the pressure regulating chamber (41) is arranged in the adjusting mounting seat (42); an adjusting screw (43) penetrating through the adjusting mounting seat (42) and abutting against the elastic reset assembly (6) is arranged at one end of the adjusting mounting seat (42) away from the valve body (1); and a sealing nut (44) abuts against the adjusting mounting seat (42) is sleeved on the other end of the adjusting screw (43).

3. The A11V plunger pump pressure cut-off valve structure according to claim 2, characterized in that: The elastic reset assembly (6) comprises an elastic mounting cavity (61) arranged in the adjustment mounting seat (42), wherein the elastic mounting cavity (61) has oppositely arranged spring mounting seats (62), and the oppositely arranged spring mounting seats (62) are connected via a reset spring (63).

4. The A11V plunger pump pressure cut-off valve structure according to claim 3, characterized in that: The oppositely arranged spring mounting seats (62) have their ends that are away from each other provided with a tapered groove (621), and the end of the spring mounting seat (62) that is close to the adjusting screw (43) abuts against the adjusting screw (43) through the tapered groove (621), and the end of the spring mounting seat (62) that is close to the valve core (2) abuts against the valve core (2) through another tapered groove (621).

5. The A11V plunger pump pressure cut-off valve structure according to claim 1, characterized in that: The sealing assembly (3) comprises a plurality of sealing rings (31) arranged on the circumferential outer side of the valve core (2), the sealing rings (31) being arranged on both sides of the middle of the valve core (2), and an oil cavity (32) arranged in the valve core installation cavity (11) is provided between the sealing rings (31), and the oil cavity (32) is connected to the oil inlet structure (5).

6. The A11V plunger pump pressure cut-off valve structure according to claim 5, characterized in that: The oil inlet structure (5) comprises an oil inlet pipeline (51) vertically arranged on one side of the valve body (1) and connected to the oil chamber (32); an oil inlet hole (52) connected to the oil inlet channel (21) is provided on the valve core (2); and the oil inlet pipeline (51) is connected to the oil inlet hole (52) via the oil chamber (32).

7. The A11V plunger pump pressure cut-off valve structure according to claim 6, characterized in that: The oil inlet hole (52) is radially arranged outside the valve core (2), and the pushing chamber (22) and the oil inlet pipeline (51) are connected through the oil inlet hole (52) and the oil inlet channel (21).

8. The A11V plunger pump pressure cut-off valve structure according to claim 6, characterized in that: The oil inlet hole (52) is arranged in the middle of the valve core (2), and the length of the oil inlet channel (21) is not less than half of the total length of the valve core (2).

9. The A11V plunger pump pressure cut-off valve structure according to claim 4, characterized in that: The valve core (2) is cylindrical, and a conical pushing portion (23) is provided at one end of the valve core (2). The conical pushing portion (23) abuts against a conical groove (621) at one end of the spring mounting seat (62).

10. The A11V plunger pump pressure cut-off valve structure according to claim 2, characterized in that: An oil unloading pipeline (12) is provided on one side of the valve body (1); the oil unloading pipeline (12) extends vertically and one end of the oil unloading pipeline (12) is connected to the pressure regulating chamber (41); and the other end of the oil unloading pipeline (12) is connected to a constant power valve spring chamber provided in the valve body (1).

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