An adjustable pressure valve for lubricating oil system

Abstract

The utility model relates to an adjustable pressure valve for a lubricating oil system, which belongs to the technical field of lubricating oil systems and solves the problem of easy jamming and tilting in the prior art. It includes a seat body, a plunger and a pressure regulating device; the seat body is a cross-shaped structure, including an oil inlet end, an oil outlet end, an adjusting end and an oil drain end; the first end of the plunger is located in the central through hole of the adjusting end, and the second end is located in the central through hole of the oil drain end. The first end of the plunger has a first end face facing the second end, and the second end of the plunger has a second end face facing the first end. The area of ​​the first end face is larger than the area of ​​the second end face, and the plunger can reciprocate between the closed position and the open position of the adjustable pressure valve; the pressure regulating device is arranged in the central through hole of the regulating end, and the plunger applies a biasing force so that the plunger is biased toward the closed position of the adjustable pressure valve. The utility model adopts a plunger with forces on both ends and being guided, so that the adjustable pressure valve is not easy to jam or tilt.

Description

Technical Field

[0001] The utility model relates to the technical field of lubricating oil systems, in particular to an adjustable pressure valve used in lubricating oil systems. Background Art

[0002] Various types of pressure regulating valves are required in the lubricating oil system. These pressure regulating valves are generally integrated on the lubricating oil pump or the system seat. They use spring-loaded pressure regulating valves. When the pressure exceeds the design value, it allows the lubricating oil to return directly from the boosting pump outlet to the boosting pump inlet or the lubricating oil tank. In this type of pressure regulating valve, the valve core is usually subjected to spring force on one end face and oil pressure on the other end face. The valve core has no guide structure or only has a very short guide structure. Its movement direction is uncontrolled and it is easy to get stuck or tilted. In addition, the pressure regulating valves in the prior art are often complex in structure, which makes installation and maintenance difficult and the cost of use high. Utility Model Content

[0003] In view of the above analysis, the embodiment of the utility model aims to provide a valve with simple structure, low cost and easy pressure adjustment, which can be widely used in lubricating oil systems to solve the problems of valve core easy to get stuck and difficult installation and maintenance.

[0004] On the one hand, the utility model provides an adjustable pressure valve for a lubricating oil system, comprising a seat body, a plunger and a pressure regulating device; the seat body is a cross-shaped structure, comprising an oil inlet end, an oil outlet end, an regulating end and an oil drain end; the first end of the plunger is located in the central through hole of the regulating end, and the second end is located in the central through hole of the oil drain end, the first end has a first end face facing the second end, the second end has a second end face facing the first end, the area of ​​the first end face is larger than the area of ​​the second end face, and the plunger can reciprocate between a closed position and an open position of the adjustable pressure valve; the pressure regulating device is arranged in the central through hole of the regulating end, one end abuts the first end, and the other end extends out of the central through hole of the regulating end; the pressure regulating device applies a biasing force to the plunger, so that the plunger is biased toward the closed position of the adjustable pressure valve.

[0005] Furthermore, the pressure regulating device comprises a pressure regulating spring, a guide sleeve, a pressure regulating screw and a screw plug.

[0006] Furthermore, one end of the pressure-adjusting spring abuts against the first end, and the other end abuts against the guide sleeve; the screw plug sleeve is arranged outside the guide sleeve and the pressure-adjusting spring, and the bottom of the screw plug is fixedly connected to the end of the adjusting end; the pressure-adjusting screw passes through the screw hole at the top of the screw plug and abuts against the top surface of the guide sleeve.

[0007] Furthermore, the plug includes a plug body and an external threaded section and a plug nut respectively located on both sides of the plug body, a second opening extending along the axis of the plug is provided in the external threaded section and the plug body, a screw hole is provided in the plug nut, and the second opening is connected to the screw hole.

[0008] Furthermore, the diameter of the screw hole is smaller than the diameter of the second opening, and a first step surface is formed at the connection between the screw hole and the second opening.

[0009] Further, the guide sleeve includes a guide column and a guide sleeve cap, the diameter of the guide sleeve cap is larger than the diameter of the guide column, and the diameter of the guide sleeve cap is equal to the diameter of the second opening.

[0010] Furthermore, the plunger further includes a middle section, the outer diameter of the first end is greater than the outer diameter of the second end, and the outer diameter of the second end is greater than the outer diameter of the middle section.

[0011] Furthermore, the first end includes a first sleeve portion, an annular groove and a plunger core portion; the annular groove is arranged between the first sleeve portion and the plunger core portion; one end of the pressure regulating spring is arranged in the annular groove, and the pressure regulating spring is sleeved outside the plunger core portion.

[0012] Further, the second end includes a second sleeve portion, a first opening is arranged in the middle of the second sleeve portion, and an oil drain hole is arranged on the circumferential wall of the first opening; when the plunger is located in the closed position of the adjustable pressure valve, the oil drain hole is blocked by the hole wall of the central through hole of the oil drain end; when the plunger is located in the open position of the adjustable pressure valve, the oil drain hole communicates with the oil inlet end, the oil outlet end and the oil drain end.

[0013] Furthermore, a plunger central through hole is provided at the central axis of the plunger.

[0014] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0015] (1) The plunger of the utility model is a three-stage type, which receives oil pressure through two surfaces, the first end face and the second end face. By making the areas of the first end face and the second end face unequal, a pressure difference is generated, and the elastic force of the spring is offset by the pressure difference, thereby realizing automatic control of the oil circuit pressure. Since the pressure is received through the two end faces, the pressure is uniform and stable, and the plunger displacement will not be stuck or tilted.

[0016] (2) The first end of the plunger of the utility model is located in the central through hole of the adjustment end, and the second end is located in the central through hole of the oil leakage end. During the movement of the plunger, the first end and the second end can be guided by the hole wall of the central through hole, thereby ensuring the stability of the movement direction and further avoiding jamming and tilting.

[0017] (3) The utility model has a simple and compact structure, low cost, and is very convenient to install and maintain, and the pressure can be adjusted according to actual needs.

[0018] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the adjustable pressure valve of the utility model;

[0021] Figure 2 It is a side view of the adjustable pressure valve of the utility model;

[0022] Figure 3 yes Figure 2 A cross-sectional view of the adjustable pressure valve along line AA;

[0023] Figure 4 It is an exploded view of the adjustable pressure valve of the utility model;

[0024] Figure 5 The utility model is an adjustable pressure valve. Figure 4 Sectional view along the midline BB;

[0025] Figure 6 It is a cross-sectional view of the plunger of the adjustable pressure valve of the utility model;

[0026] Figure 7 It is a cross-sectional view of the seat body of the adjustable pressure valve of the utility model;

[0027] Figure 8 It is a cross-sectional view of the guide sleeve of the adjustable pressure valve of the utility model;

[0028] Fig. 9 It is a cross-sectional view of the screw plug of the adjustable pressure valve of the utility model;

[0029] Fig.10 The utility model is a cross-sectional view of the adjustable pressure valve in the closed state (a) and the open state (b).

[0030] Reference numerals:

[0031] 1- plunger; 11- first end; 111- first sleeve portion; 112- annular groove; plunger core 113; first groove 1131; 12- second end; 121- second sleeve portion; 122- oil drain hole; 123- first opening; 13- middle section; 14- plunger center through hole; 2- pressure regulating spring; 3- first sealing ring; 4- second sealing ring; 5- guide sleeve; 51- guide column; 52- guide sleeve cap; 53 -second sealing groove; 6-pressure-adjusting screw; 7-screw plug; 71-external threaded section; 72-screw plug body; 73-screw plug nut; 74-second opening; 75-screw hole; 76-first step surface; 77-second step surface; 8-seat body; 80-oil inlet end; 81-adjusting end; 811-first sealing groove; 82-oil drain end; 821-first section; 822-second section; 823-third section; 83-oil outlet end. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] A specific embodiment of the utility model is as follows Figure 1 As shown, a pressure-adjustable valve for a lubricating oil system is disclosed. The pressure-adjustable valve is installed on the lubricating oil pump or the oil channel of the lubricating oil system and is used to return the lubricating oil to the oil guide tank when the oil pressure is too high, so as to maintain the pressure in the oil channel of the lubricating oil system not exceeding a preset value.

[0034] The adjustable pressure valve comprises a seat body 8. Figure 1-Figure 5 as well as Figure 7 The seat body 8 is a cross-shaped structure, consisting of two mutually perpendicular pipes, and the internal oil paths of the two pipes are interconnected. Figure 7 The seat body 8 includes an oil inlet end 80 and an oil outlet end 83 arranged in a straight line, and an adjusting end 81 and an oil drain end 82 perpendicular to the oil inlet end 80 and the oil outlet end 83, wherein the oil inlet end 80 is connected to the lubricating oil supply end, the oil outlet end 83 is connected to the lubricating oil outlet, the adjusting end 81 is used to set a pressure regulating device, and the oil drain end 82 is connected to the oil tank. A plunger 1 is arranged in the cavity between the adjusting end 81 and the oil drain end 82.

[0035] Among them, see Figure 7The internal oil paths of the oil inlet end 80 and the oil outlet end 83 have the same diameter and are located on the same straight line. The opening end of the central through hole of the adjustment end 81 is provided with a first sealing groove 811, and the diameter of the first sealing groove 811 is larger than the diameter of the central through hole of the adjustment end 81. Figure 3 , the first sealing groove 811 is used to set the first sealing ring 3. The central through hole of the oil drain end 82 is divided into a first section 821, a second section 822, and a third section 823 from the inside to the outside. Among them, the first section 821 is connected to the internal oil circuits of the oil inlet end 80 and the oil outlet end 83, and the diameter of the first section 821 is equal to the diameter of the central through hole of the adjustment end 81. The diameter of the second section 822 is smaller than the diameter of the first section 821, and is equal to the outer diameter of the second end 12 of the plunger 1. The diameter of the third section 823 is smaller than the diameter of the second section 822, and the third section 823 is connected to the outside of the seat body 8.

[0036] The adjustable pressure valve also includes a plunger 1, see Figure 4-Figure 6 The plunger 1 is roughly barbell-shaped, and includes a first end 11, a second end 12, and a middle section 13, all of which are cylindrical structures. The outer diameter of the first end 11 is greater than the outer diameter of the second end 12, and the outer diameter of the second end 12 is greater than the outer diameter of the middle section 13.

[0037] During assembly, the second end 12 of the plunger 1 enters the seat body 8 from the adjustment end 81, the end of the second end 12 abuts against the step surface in the oil drain end 82, and the first end 11 abuts against the pressure regulating spring 2. The first end 11 of the plunger 1 is located in the central through hole of the adjustment end 81, and the outer diameter of the first end 11 is equal to the diameter of the central through hole of the adjustment end 81. The second end 12 is located in the central through hole of the oil drain end 82, and the outer diameter of the second end 12 is equal to the diameter of the second section 822 of the central through hole of the oil drain end 82.

[0038] See also Fig.10 , under the combined action of the force of the pressure regulating spring 2 and the lubricating oil pressure, the plunger 1 can reciprocate between the closed position and the open position of the adjustable pressure valve along the axial direction of the regulating end 81 and the oil drain end 82 in the seat body 8. Since the outer diameter of the first end 11 is greater than the outer diameter of the second end 12, the pressure of the lubricating oil on the end surface of the first end 11 is greater than the pressure on the end surface of the second end 12, that is, the lubricating oil applies a force to the plunger 1 in the direction of the regulating end 81. If the pressure of the lubricating oil in the oil channel is too large, the force applied by the lubricating oil to the plunger 1 is greater than the force of the pressure regulating spring 2. At this time, the plunger 1 will move toward the regulating end 81, so that the oil channel is connected to the oil tank, and the lubricating oil flows out from the oil drain end 82 and returns to the oil tank. When the lubricating oil pressure in the oil channel returns to the normal range, the plunger 1 moves toward the oil drain end 82 under the action of the pressure regulating spring 2, so that the oil channel is disconnected from the oil tank to keep the oil pressure in the oil channel stable.

[0039] Further, see Figure 6 The first end 11 of the plunger 1 includes a first sleeve portion 111, an annular groove 112 and a plunger core portion 113. The first sleeve portion 111 includes a first end face and a first barrel portion. The first end face extends radially outward from the circumferential surface of one end of the middle section 13, and the first barrel portion extends axially from the outer circumference of the first end face in a direction away from the second end 12. The plunger core portion 113 extends axially along the middle section 13 and is located inside the first sleeve portion 111. The end face of the plunger core portion 113 is flush with the end face of the first sleeve portion 111. An annular groove 112 is provided between the first sleeve portion 111 and the plunger core portion 113. See FIG. Figure 3 One end of the pressure regulating spring 2 can be arranged in the annular groove 112 and sleeved outside the plunger core 113 .

[0040] Furthermore, an annular first groove 1131 is provided on the outer peripheral surface of the plunger core 113 near the top end, which can facilitate clamping when removing the valve core.

[0041] The second end 12 of the plunger 1 includes a second sleeve portion 121, which includes a second end face and a second barrel portion, wherein the second end face extends radially outward from the circumferential surface of the other end of the middle section, and the second barrel portion extends axially from the outer circumference of the second end face in a direction away from the first end 11. A first opening 123 is provided in the middle of the second sleeve portion 121, and the second barrel portion constitutes a circumferential wall of the first opening 123. An oil drain hole 122 is provided in the second barrel portion, preferably four oil drain holes 122 arranged symmetrically with respect to the center. The oil drain hole 122 is a through hole.

[0042] A plunger center through hole 14 is provided at the central axis of the plunger 1. The plunger center through hole 14 extends from the end face of the plunger core 113 to the first opening 123, and can connect the cavity inside the adjusting end 81 with the oil drain end 82, so as to avoid the pressure change inside the adjusting end 81 when the plunger 1 moves, thereby preventing the pressure difference between the adjusting end 81 and the oil drain end 82 from affecting the movement of the plunger 1.

[0043] See also Figure 3-Figure 5 The pressure regulating device of the adjustable pressure valve includes a pressure regulating spring 2, a guide sleeve 5, a pressure regulating screw 6 and a screw plug 7. Among them, one end of the pressure regulating spring 2 abuts against the top of the plunger 1, and the other end abuts against the guide sleeve 5. The screw plug 7 is sleeved on the outer circumference and top of the guide sleeve 5, and the pressure regulating screw 6 passes through the screw hole 75 on the top of the screw plug 7 and abuts on the top surface of the guide sleeve 5, limiting the position of the guide sleeve 5 relative to the screw plug 7. By adjusting the pressure regulating screw 6, the guide sleeve 5 can be controlled to move in the vertical direction relative to the screw plug 7, thereby changing the compression amount of the pressure regulating spring 2 and adjusting the preload force of the pressure regulating spring 2.

[0044] See also Figure 8The guide sleeve 5 includes a guide post 51 and a guide sleeve cap 52. The diameter of the guide sleeve cap 52 is larger than the diameter of the guide post 51, and the diameter of the guide sleeve cap 52 is equal to the diameter of the second opening 74 of the screw plug 7. A second sealing groove 53 is provided on the outer circumferential surface of the guide sleeve cap 52. Figure 3 During assembly, the guide sleeve cap 52 of the guide sleeve 5 is placed into the second opening 74 of the screw plug 7, the pressure regulating spring 2 is sleeved on the outer circumferential surface of the guide post 51, and the top of the pressure regulating spring 2 abuts against the step surface between the guide sleeve cap 52 and the guide post 51. Under the joint action of the pressure regulating spring 2 and the pressure regulating screw 6, the guide sleeve 5 can reciprocate axially in the second opening 74 of the screw plug 7. In addition, a second sealing ring 4 is arranged in the second sealing groove 53.

[0045] See also Fig. 9 The screw plug 7 includes a screw plug body 72 and an external thread section 71 and a screw plug nut 73 respectively located on both sides of the screw plug body 72. The diameter of the screw plug body 72 is larger than the diameter of the circumscribed circle of the external thread section 71 and the screw plug nut 73. A second opening 74 is provided along the axis in the external thread section 71 and the screw plug body 72, and a screw hole 75 is provided in the screw plug nut 73. The second opening 74 is connected to the screw hole 75, and the diameter of the screw hole 75 is smaller than the diameter of the second opening 74. A first step surface 76 is formed at the connection between the screw hole 75 and the second opening 74, and a second step surface 77 is formed at the connection between the screw plug body 72 and the external thread section 71.

[0046] See also Figure 3 During assembly, the external thread section 71 of the screw plug 7 is screwed into the adjusting end 81 of the seat body 8, the pressure regulating spring 2 and the guide sleeve 5 are both placed in the second opening 74 of the screw plug 7, the first step surface 76 abuts against the top surface of the guide sleeve 5, and the second step surface 77 abuts against the end surface of the adjusting end 81. The pressure regulating screw 6 is screwed into the screw hole 75 of the screw plug 7 and abuts against the top surface of the guide sleeve 5.

[0047] A screw center through hole is arranged along the axis line in the pressure regulating screw 6 . When the pressure regulating screw 6 drives the guide sleeve 5 downward, the outside is connected with the cavity between the guide sleeve 5 and the screw plug 7 to avoid the influence of vacuum negative pressure on the guide sleeve 5 .

[0048] Compared with the prior art, the adjustable pressure valve provided in this embodiment has the first end 11 of the plunger 1 supporting and limiting the pressure regulating spring 2, and is convenient for removing the plunger 1 during maintenance. The second end 12 is provided with an oil drain hole 122, and the oil drain holes 122 are symmetrically arranged, which is conducive to ensuring that the force generated on the plunger 1 during the oil drain process remains balanced. The first end 11 and the second end 12 of the plunger 1 slide in the central through holes of the adjustment end 81 and the oil drain end 82 of the seat body 8 respectively, and the two central through holes respectively guide the plunger 1, which can ensure that the movement direction of the plunger 1 does not deviate and avoid jamming. The diameters of the first end face and the second end face of the plunger 1 are different, and the oil pressure generates a pressure difference on the plunger 1 through the middle oil channel. When the pressure difference reaches the set opening pressure value, the oil pressure pushes the plunger 1 to move upward, and the oil flows out from the four oil drain holes 122 of the second end 12 of the plunger 1 to control the function of the lubrication system.

[0049] 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 changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-adjustable valve for a lubricating oil system, characterized in that: The invention comprises a seat body (8), a plunger (1) and a pressure regulating device; the seat body (8) is a cross-shaped structure, comprising an oil inlet end (80), an oil outlet end (83), an adjusting end (81) and an oil drain end (82); a first end (11) of the plunger (1) is located in a central through hole of the adjusting end (81), and a second end (12) is located in a central through hole of the oil drain end (82); the first end (11) has a first end face facing the second end (12), and the second end (12) has a first end face facing the first end ( The second end face of the regulating end (81) is provided with a first end face (11), the area of ​​the first end face is larger than the area of ​​the second end face, and the plunger (1) is capable of reciprocating between a closed position and an open position of the adjustable pressure valve; the pressure regulating device is arranged in a central through hole of the regulating end (81), one end of the pressure regulating device abuts against the first end (11), and the other end extends out of the central through hole of the regulating end (81); the pressure regulating device applies a biasing force to the plunger (1), so that the plunger (1) is biased toward the closed position of the adjustable pressure valve.

2. The adjustable pressure valve for lubricating oil system according to claim 1, characterized in that: The pressure regulating device comprises a pressure regulating spring (2), a guide sleeve (5), a pressure regulating screw (6) and a screw plug (7).

3. The adjustable pressure valve for lubricating oil system according to claim 2, characterized in that: One end of the pressure-adjusting spring (2) abuts against the first end (11), and the other end abuts against the guide sleeve (5); the screw plug (7) is sleeved outside the guide sleeve (5) and the pressure-adjusting spring (2), and the bottom of the screw plug (7) is fixedly connected to the end of the adjusting end (81); the pressure-adjusting screw (6) passes through the screw hole (75) at the top of the screw plug (7) and abuts against the top surface of the guide sleeve (5).

4. The adjustable pressure valve for a lubricating oil system according to claim 3, characterized in that: The screw plug (7) comprises a screw plug body (72) and an external thread section (71) and a screw plug nut (73) respectively located on both sides of the screw plug body (72); a second opening (74) extending along the axis of the screw plug (7) is provided in the external thread section (71) and the screw plug body (72); a screw hole (75) is provided in the screw plug nut (73); and the second opening (74) is communicated with the screw hole (75).

5. The adjustable pressure valve for lubricating oil system according to claim 4, characterized in that: The diameter of the screw hole (75) is smaller than the diameter of the second opening (74), and a first step surface (76) is formed at the connection between the screw hole (75) and the second opening (74).

6. The adjustable pressure valve for a lubricating oil system according to claim 5, characterized in that: The guide sleeve (5) comprises a guide column (51) and a guide sleeve cap (52); the diameter of the guide sleeve cap (52) is greater than the diameter of the guide column (51), and the diameter of the guide sleeve cap (52) is equal to the diameter of the second opening (74).

7. An adjustable pressure valve for a lubricating oil system according to any one of claims 1 to 6, characterized in that: The plunger (1) further comprises a middle section (13), the outer diameter of the first end (11) is greater than the outer diameter of the second end (12), and the outer diameter of the second end (12) is greater than the outer diameter of the middle section (13).

8. The adjustable pressure valve for a lubricating oil system according to claim 7, characterized in that: The first end (11) comprises a first sleeve portion (111), an annular groove (112) and a plunger core portion (113); the annular groove (112) is arranged between the first sleeve portion (111) and the plunger core portion (113); one end of the pressure regulating spring (2) is arranged in the annular groove (112), and the pressure regulating spring (2) is sleeved outside the plunger core portion (113).

9. The adjustable pressure valve for a lubricating oil system according to claim 8, characterized in that: The second end (12) comprises a second sleeve portion (121), a first opening (123) is arranged in the middle of the second sleeve portion (121), and an oil drain hole (122) is arranged on the circumferential wall of the first opening (123); when the plunger (1) is located in the closed position of the adjustable pressure valve, the oil drain hole (122) is blocked by the hole wall of the central through hole of the oil drain end (82); when the plunger (1) is located in the open position of the adjustable pressure valve, the oil drain hole (122) is connected to the oil inlet end (80), the oil outlet end (83) and the oil drain end (82).

10. The adjustable pressure valve for a lubricating oil system according to claim 7, characterized in that: A plunger central through hole (14) is provided at the central axis of the plunger (1).

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