Pressure regulating device and diesel engine

Abstract

The application discloses a pressure regulating device and a diesel engine, and belongs to the technical field of pressure regulation. The pressure regulating device comprises a valve body, a plunger and an elastic assembly. The valve body is provided with a first accommodating cavity, an oil inlet hole and an oil outlet hole which are in communication with each other, and the plunger is arranged in the first accommodating cavity. The plunger can move along the axial direction of the valve body to make the oil inlet hole and the oil outlet hole communicate or disconnect. The elastic assembly is arranged in the first accommodating cavity and comprises a first spring and a second spring. The first spring is connected with the valve body and the plunger along the axial direction respectively, and the first spring can be stretched or compressed along the axial direction. The second spring is arranged around the outer circumferential side of the first spring and abuts against the valve body and the plunger along the axial direction respectively. The second spring can be compressed along the axial direction. The first spring inserted in the second spring is combined with the first spring capable of being stretched or compressed along the axial direction and the second spring capable of being compressed along the axial direction, so that the overall structure is compact, the pressure regulating range is increased, the pressure regulating device can quickly respond, and the working stability is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure regulation, and particularly relates to a pressure regulating device and a diesel engine. BACKGROUND

[0002] The oil system is one of the main guarantees for the operation of the diesel engine, and is responsible for the wear reduction and cooling of the main moving parts of the diesel engine. In the design process of the oil system, due to the influence of the performance characteristics of the oil pump, a pressure regulating valve or a pressure regulating device needs to be arranged to bypass and discharge the oil at high speed, so as to prevent the wear and leakage caused by the high oil pressure. However, in order to ensure that the pressure regulating valve has a fast response speed, the spring of the pressure regulating valve needs to have a larger diameter and a larger number of turns at this time, and at this time, the size of the spring is larger, and the size of the corresponding pressure regulating valve is also larger, which cannot be applied to the compact diesel engine oil system. SUMMARY

[0003] The application provides a pressure regulating device, which aims to solve the problem that the existing pressure regulating device has a large overall structure size when having a fast response speed, and cannot be applied to the compact diesel engine oil system. Another object of the application is to provide a diesel engine.

[0004] TECHNICAL SOLUTION The pressure regulating device provided by the application comprises:

[0005] A valve body having a first accommodating cavity, an oil inlet hole and an oil discharge hole which are in communication with each other;

[0006] A plunger arranged in the first accommodating cavity; the plunger can move along the axial direction of the valve body to make the oil inlet hole and the oil discharge hole communicate or disconnect;

[0007] An elastic assembly arranged in the first accommodating cavity and comprising:

[0008] A first spring connected with the valve body and the plunger along the axial direction respectively, and the first spring can be stretched or compressed along the axial direction;

[0009] A second spring arranged around the outer periphery of the first spring and abutting against the valve body and the plunger along the axial direction; the second spring can be compressed along the axial direction.

[0010] In some embodiments, the first spring comprises:

[0011] A spring body;

[0012] A first connecting portion connected with the spring body and the valve body respectively;

[0013] A second connecting portion arranged at one end of the spring body away from the first connecting portion and connected with the spring body and the plunger respectively.

[0014] In some embodiments,

[0015] The first connecting part comprises:

[0016] a first connecting plate connected to the spring body and the valve body, respectively;

[0017] a first guide rod connected to one side of the first connecting plate facing the spring body, the first guide rod being arranged in the spring body;

[0018] The second connecting part comprises:

[0019] a second connecting plate connected to the spring body and the plunger, respectively;

[0020] a second guide rod connected to one side of the second connecting plate facing the spring body, the second guide rod being arranged in the spring body.

[0021] In some embodiments, the pressure regulating device further comprises:

[0022] a first connecting member connected to the first connecting part and the valve body;

[0023] a second connecting member connected to the second connecting part and the plunger.

[0024] In some embodiments,

[0025] The valve body is provided with a first limiting part on one side facing the first connecting plate along the axial direction, the first connecting plate is provided with a first limiting groove, and the first limiting part is arranged in the first limiting groove;

[0026] The plunger is provided with a second limiting part on one side facing the second connecting plate along the axial direction, the second connecting plate is provided with a second limiting groove, and the second limiting part is arranged in the second limiting groove.

[0027] In some embodiments,

[0028] The valve body is provided with a plurality of first limiting parts arranged around the spring body, the first connecting plate is provided with a plurality of first limiting grooves arranged around the first guide rod, and each first limiting part is arranged in one first limiting groove;

[0029] The plunger is provided with a plurality of second limiting parts arranged around the spring body, the second connecting plate is provided with a plurality of second limiting grooves arranged around the second guide rod, and each second limiting part is arranged in one second limiting groove.

[0030] In some embodiments,

[0031] The first connecting part further comprises a plurality of first limiting rings, each of the plurality of first limiting rings is connected with the first connecting plate, and the plurality of first limiting rings are arranged at the outer circumferential side of the first guide rod in a spaced manner; one end of the spring body connected with the first connecting part is respectively arranged in the plurality of first limiting rings;

[0032] The second connecting part further comprises a plurality of second limiting rings, each of the plurality of second limiting rings is connected with the second connecting plate, and the plurality of second limiting rings are arranged at the outer circumferential side of the second guide rod in a spaced manner; one end of the spring body connected with the second connecting part is respectively arranged in the plurality of second limiting rings.

[0033] In some embodiments, the first guide rod and the second guide rod are coaxial.

[0034] In some embodiments, along the axial direction, the distance between the first guide rod and the second guide rod is greater than the distance between the plunger and the bottom wall of the valve body.

[0035] In some embodiments, along the radial direction of the valve body, the first spring and the second spring are arranged in a spaced manner, and the second spring is arranged in a spaced manner with the side wall of the valve body.

[0036] In some embodiments,

[0037] The plunger has a second accommodating cavity, the second accommodating cavity penetrates through one side of the plunger away from the oil inlet hole, and the second accommodating cavity is in communication with the first accommodating cavity;

[0038] Part of the first spring and part of the second spring are arranged in the second accommodating cavity and connected with the plunger; the second spring is arranged in a spaced manner with the inner side wall of the plunger.

[0039] In some embodiments, the second accommodating cavity comprises a first sub-cavity and a second sub-cavity in communication, the second sub-cavity is arranged on one side of the first sub-cavity away from the oil inlet hole; the maximum inner diameter of the first sub-cavity is smaller than the minimum inner diameter of the second sub-cavity.

[0040] In some embodiments, the plunger has a pressure balance hole in communication with the second accommodating cavity and the oil outlet hole respectively.

[0041] In some embodiments, the oil outlet hole comprises a first area and a second area in communication, the first area is arranged on one side of the second area close to the oil inlet hole; along the circumferential direction of the valve body, the size of the first area is smaller than the size of the second area.

[0042] In some embodiments, the pressure regulating device further comprises a plunger seat arranged on the valve body at a side close to the oil inlet hole and connected with the valve body; at least a part of the plunger seat is arranged at a side of the plunger away from the elastic assembly, and the plunger seat is capable of sealingly abutting against the plunger; the plunger seat has a through hole capable of communicating with the oil inlet hole and the oil discharge hole.

[0043] In some embodiments, the plunger comprises a first segment and a second segment connected to a side of the first segment away from the oil inlet hole; when the plunger seat abuts against the plunger, at least a part of the oil discharge hole is arranged opposite to the first segment; the second segment has an outer diameter greater than that of the first segment, and an oil discharge gap is formed between an outer side wall of the first segment and an inner side wall of the valve body, the oil discharge gap communicating with the oil discharge hole.

[0044] In some embodiments, a first transition surface is arranged on a side of the plunger close to the plunger seat, a second transition surface is arranged on a side of the plunger seat facing the plunger, and the first transition surface is capable of sealingly abutting against the second transition surface; the second transition surface is used to enclose the through hole, and a part of the plunger is arranged in the through hole.

[0045] In some embodiments, when the plunger seat abuts against the plunger, the first spring is in a stretched state, and the second spring is in a compressed state.

[0046] In some embodiments, the valve body has a plurality of oil discharge holes arranged at intervals along a circumference of the valve body.

[0047] Correspondingly, the diesel engine comprises an oil system and the pressure regulating device according to any one of the preceding embodiments, the pressure regulating device is arranged in the oil system and used to regulate the pressure in the oil system.

[0048] Beneficial effects: compared with the prior art, the pressure regulating device of the embodiment of the application comprises a valve body, a plunger and an elastic assembly, the valve body has a first accommodating cavity, an oil inlet hole and an oil outlet hole which are in communication with each other, and the plunger is arranged in the first accommodating cavity; the plunger can move along the axial direction of the valve body to make the oil inlet hole and the oil outlet hole communicate or disconnect; the elastic assembly is arranged in the first accommodating cavity and comprises a first spring and a second spring, the first spring is connected with the valve body and the plunger along the axial direction respectively, and the first spring can be stretched or compressed along the axial direction; the second spring is arranged around the outer circumferential side of the first spring and abuts against the valve body and the plunger along the axial direction respectively; and the second spring can be compressed along the axial direction. In the application, the elastic assembly is arranged in the combination of the first spring and the second spring, the first spring can be stretched or compressed along the axial direction, the second spring can be compressed along the axial direction, and the first spring is inserted into the second spring; through the combined action of the first spring and the second spring, the size of the elastic assembly can be reduced, and the overall size of the pressure regulating device can be correspondingly reduced, the structure is compact, and the pressure regulating range is effectively increased compared with the pressure regulating device with only the second spring. Through the negative feedback of the first spring to the plunger, the axial displacement of the plunger caused by the instantaneous fluctuation of the main oil passage pressure in the working process can be reduced, the influence of the pressure regulating device on the lubricating oil pressure of the main oil passage is reduced, and the main oil passage pressure is stabilized.

[0049] Compared with the prior art, the diesel engine of the embodiment of the application comprises a lubricating oil system and the pressure regulating device according to any one of the preceding embodiments, the pressure regulating device is arranged in the lubricating oil system and is used for regulating the pressure in the lubricating oil system. It can be understood that the diesel engine of the embodiment of the application comprises all the technical features and technical effects of the preceding pressure regulating device, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0051] Figure 1 is the overall structure schematic diagram of the pressure regulating device of the embodiment of the application;

[0052] Figure 2 is the exploded view of the pressure regulating device of the embodiment of the application;

[0053] Figure 3 is the side view of the pressure regulating device of the embodiment of the application;

[0054] Figure 4 is Figure 3Sectional view of section line AA in the middle;

[0055] Figure 5 yes Figure 3 Sectional view of the BB section line;

[0056] Figure 6 yes Figure 3 A sectional view of the CC section line;

[0057] Figure 7 This is a schematic diagram of the overall structure of a first spring according to an embodiment of this application;

[0058] Figure 8 This is a side view of a first spring according to an embodiment of this application;

[0059] Figure 9 yes Figure 4 Enlarged view of section D;

[0060] Figure 10 This is a schematic diagram of the working state of a pressure regulating device according to an embodiment of this application.

[0061] Reference numerals: 1. Valve body; 11. First receiving cavity; 12. Oil inlet; 13. Oil drain; 131. First region; 132. Second region; 14. First limiting part; 2. Plunger; 21. Second limiting part; 22. Second receiving cavity; 221. First sub-cavity; 222. Second sub-cavity; 23. Pressure balance hole; 24. First section; 25. Second section; 26. First transition surface; 3. Elastic component; 31. First spring; 311. Spring body; 312. First 3121, First connecting plate; 31211, First limiting groove; 3122, First guide rod; 3123, First limiting ring; 313, Second connecting part; 3131, Second connecting plate; 31311, Second limiting groove; 3132, Second guide rod; 3133, Second limiting ring; 32, Second spring; 4, First connecting piece; 5, Second connecting piece; 6, Piston seat; 61, Through hole; 62, Second transition surface; 7, Oil drain gap; X, Axial direction. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0063] In the description of the present application, it needs to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical, for example, within the range of 80°-100°, it is considered as vertical, similarly, "parallel" means completely parallel or almost completely parallel, for example, within the range of 10° of complete parallel, it is considered as parallel.

[0064] In the diesel engine related technology, the lubricating oil system is one of the main guarantees for the operation of the diesel engine, responsible for the wear reduction and cooling of the main moving parts of the diesel engine. In the design process of the lubricating oil system, due to the influence of the performance characteristics of the lubricating oil pump, a pressure regulating device (pressure regulating valve) needs to be arranged to bypass the lubricating oil at high speed to prevent wear, leakage and other failures caused by excessive lubricating oil pressure. However, the pressure regulating valve is affected by the spring selection, and the structure is not compact enough. In the design process of the pressure regulating valve, if a compact spring structure is selected, the spring diameter and the number of turns need to be reduced, and the spring stiffness will increase accordingly, resulting in slow pressure regulating response; if the spring stiffness needs to be reduced to speed up the pressure regulating response speed, a larger diameter and a larger number of turns need to be selected, which inevitably leads to an increase in the size of the spring, and the size of the pressure regulating valve needs to be increased accordingly, which cannot be applied to the compact lubricating oil system.

[0065] Therefore, the embodiments of the present application provide a pressure regulating device to solve the above problems.

[0066] Please refer to Figures 1-8The embodiment of the present application provides a pressure regulating device, which comprises a valve body 1, a plunger 2 and an elastic assembly 3, the valve body 1 has a first accommodating cavity 11, an oil inlet hole 12 and an oil outlet hole 13 which are communicated with each other, and the plunger 2 is arranged in the first accommodating cavity 11; the plunger 2 can move along the axial direction X of the valve body 1, so as to make the oil inlet hole 12 and the oil outlet hole 13 communicate or disconnect; the elastic assembly 3 is arranged in the first accommodating cavity 11 and comprises a first spring 31 and a second spring 32, the first spring 31 is connected with the valve body 1 and the plunger 2 along the axial direction X respectively, and the first spring 31 can be stretched or compressed along the axial direction X; the second spring 32 is arranged around the outer circumferential side of the first spring 31 and abuts against the valve body 1 and the plunger 2 along the axial direction X respectively; and the second spring 32 can be compressed along the axial direction X.

[0067] In the embodiment of the present application, by arranging the elastic assembly 3 as the combination of the first spring 31 and the second spring 32, and by arranging the first spring 31 to be capable of being stretched or compressed along the axial direction X, the second spring 32 to be capable of being compressed along the axial direction X, and the first spring 31 to be inserted in the second spring 32, the common action of the combination of the first spring 31 and the second spring 32 can not only reduce the size of the elastic assembly, but also reduce the overall size of the pressure regulating device, so that the structure is compact, and the pressure regulating range is effectively increased compared with the pressure regulating device with only the second spring 32. In addition, by the negative feedback of the first spring 31 to the plunger 2, the axial displacement of the plunger 2 in the working process can be reduced, the influence of the pressure regulating device on the oil pressure of the main oil passage of the oil system is reduced, and the pressure of the main oil passage is stabilized.

[0068] Specifically, in the embodiment of the present application, by arranging the spring combination mode that the first spring 31 is nested in the second spring 32, the volume of the elastic assembly 3 along the axial direction X can be reduced, and when the pressure of the main oil passage of the oil system is regulated, the first spring 31 and the second spring 32 are combined and simultaneously work, so that the pressure regulating device has a large pressure regulating range. In some embodiments, when the first spring 31 is in the stretched state and the second spring 32 is in the compressed state, the first spring 31 and the second spring 32 have opposite forces on the plunger 2, the part of the thrust of the second spring 32 is offset by the tension of the first spring 31, which is equivalent to that the thrust of the second spring 32 is reduced, and the overall rigidity of the elastic assembly 3 is smaller than that when there is only the second spring 32, so that the pressure regulating device can quickly respond when the pressure of the main oil passage increases, which is beneficial to stabilize the pressure of the main oil passage of the diesel engine under high speed. Further, when the first spring 31 is in the compressed state and the second spring 32 is in the compressed state, the first spring 31 and the second spring 32 simultaneously exert thrust on the plunger 2, the rigidity of the elastic assembly 3 as a whole is increased, so that the plunger 2 is not easy to displace to the inside of the valve body 1, thereby the pressure regulating device has a large pressure regulating range.

[0069] Please refer toFigure 7 and Figure 8 In some embodiments, the first spring 31 comprises a spring body 311, a first connecting portion 312 and a second connecting portion 313, the first connecting portion 312 is connected with the spring body 311 and the valve body 1 respectively, and the second connecting portion 313 is arranged at one end of the spring body 311 away from the first connecting portion 312 and is connected with the spring body 311 and the plunger 2 respectively.

[0070] Please refer again to Figure 7 and Figure 8 In the embodiments of the present application, the first connecting portion 312 is arranged to achieve the fixed connection between the spring body 311 and the valve body 1, and the second connecting portion 313 is arranged to achieve the connection between the spring body 311 and the plunger 2, so that the spring body 311 can be stretched or compressed in the axial direction X in the first accommodating cavity 11; the first connecting portion 312 and the second connecting portion 313 are arranged at intervals, which can provide a compression space for the spring body 311 and facilitate the pressure regulating function of the first spring 31.

[0071] In some embodiments, the first connecting portion 312 comprises a first connecting plate 3121 and a first guide rod 3122, the first connecting plate 3121 is connected with the spring body 311 and the valve body 1 respectively, and the first guide rod 3122 is connected to one side of the first connecting plate 3121 facing the spring body 311 and is arranged in the spring body 311; the second connecting portion 313 comprises a second connecting plate 3131 and a second guide rod 3132, the second connecting plate 3131 is connected with the spring body 311 and the plunger 2 respectively, and the second guide rod 3132 is connected to one side of the second connecting plate 3131 facing the spring body 311 and is arranged in the spring body 311.

[0072] In the embodiments of the present application, the first connecting plate 3121 is arranged to achieve a larger contact area between the first connecting portion 312 and the valve body 1, thereby ensuring the stability of the connection between the first connecting portion 312 and the valve body 1; the second connecting plate 3131 is arranged to achieve a larger contact area between the second connecting portion 313 and the plunger 2, thereby ensuring the stability of the connection between the second connecting portion 313 and the plunger 2; in this way, the stability of the connection between the first spring 31 and the valve body 1 and the plunger 2 can be ensured during the movement of the plunger 2. By arranging the first guide rod 3122 and the second guide rod 3132, the spring body 311 can be guided during the stretching or compression of the spring body 311, which can avoid the deformation and bending of the spring body 311 during the compression due to the small diameter and relatively long size of the spring body 311, thereby reducing or even losing the force on the plunger 2, so as to avoid affecting the pressure regulating capacity and stability of the plunger 2, and can help the uniform stress of the spring body 311 and effectively protect the service life of the spring body 311.

[0073] Please refer again to Figures 1-6In some embodiments, the pressure regulating device further comprises a first connecting member 4 and a second connecting member 5, the first connecting member 4 is connected with the first connecting part 312 and the valve body 1, and the second connecting member 5 is connected with the second connecting part 313 and the plunger 2.

[0074] In the embodiments of the present application, by arranging the first connecting member 4 and the second connecting member 5, the effective connection of the first spring 31 with the valve body 1 and the plunger 2 can be achieved. The first connecting member 4 and the second connecting member 5 can be bolts, and corresponding through holes 61 can be formed in the valve body 1 and the plunger 2, and threaded holes can be formed in the first connecting part 312 and the second connecting part 313. The first connecting member 4 is screwed into the through hole in the valve body 1 and the threaded hole in the first connecting part 312, thereby achieving the effective fixed connection of the first spring 31 with the valve body 1. The second connecting member 5 is screwed into the through hole in the plunger 2 and the threaded hole in the second connecting part 313, thereby achieving the effective fixed connection of the first spring 31 with the plunger 2.

[0075] It should be noted that the first connecting member 4 and the second connecting member 5 can achieve the detachable connection of the first spring 31 with the valve body 1 and the plunger 2, so that different stiffness of the first spring 31 can be replaced flexibly according to the pressure regulating requirement, and the pressure regulating assembly has different pressure regulating ranges.

[0076] Please refer to Figures 5-8 In some embodiments, the valve body 1 is provided with a first limiting part 14 on one side thereof along the axial direction X towards the first connecting plate 3121, the first connecting plate 3121 is provided with a first limiting groove 31211, and the first limiting part 14 is inserted into the first limiting groove 31211. The plunger 2 is provided with a second limiting part 21 on one side thereof along the axial direction X towards the second connecting plate 3131, and the second connecting plate 3131 is provided with a second limiting groove 31311, and the second limiting part 21 is inserted into the second limiting groove 31311.

[0077] In the embodiments of the present application, by arranging the first limiting part 14 and the first limiting groove 31211 in cooperation, and the second limiting part 21 and the second limiting groove 31311 in cooperation, the first connecting part 312 and the second connecting part 313 can be positioned and limited preferentially when the first spring 31 is assembled. When the first connecting member 4 and the second connecting member 5 are screwed, the first connecting part 312 and the second connecting part 313 can be prevented from rotating, thereby preventing the spring body 311 from being twisted, facilitating the installation of the first spring 31, and ensuring that the first spring 31 is not subjected to torsional force when working, thereby achieving the expected pressure regulating range of the elastic assembly 3 as a whole.

[0078] Please refer to Figures 5-8In some embodiments, the valve body 1 is provided with a plurality of first limiting portions 14, which are arranged around the spring body 311; the first connecting plate 3121 is provided with a plurality of first limiting grooves 31211, which are arranged around the first guide rod 3122, and each first limiting portion 14 is inserted into one first limiting groove 31211; the plunger 2 is provided with a plurality of second limiting portions 21, which are arranged around the spring body 311; the second connecting plate 3131 is provided with a plurality of second limiting grooves 31311, which are arranged around the second guide rod 3132, and each second limiting portion 21 is inserted into one second limiting groove 31311.

[0079] In the embodiments of the present application, the cooperation of the plurality of first limiting portions 14 and the plurality of first limiting grooves 31211 and the cooperation of the plurality of second limiting portions 21 and the plurality of second limiting grooves 31311 can improve the flexibility of the installation and positioning of the first spring 31, and facilitate the positioning and limiting of the first connecting portion 312 and the valve body 1.

[0080] Specifically, in the embodiments of the present application, the first limiting portion 14 and the second limiting portion 21 can each have two, and the first limiting groove 31211 and the second limiting groove 31311 can each have a multiple of two, at this time, two first limiting grooves 31211 are used as a group to cooperate with two first limiting portions 14 for positioning and limiting, and two second limiting grooves 31311 are used as a group to cooperate with two second limiting portions 21 for positioning and limiting, and there can be multiple groups of first limiting grooves 31211 and multiple groups of second limiting grooves 31311. The embodiments of the present application and the drawings take two groups, that is, four first limiting grooves 31211 and second limiting grooves 31311 as an example to demonstrate.

[0081] Please refer to Figures 5-8 In some embodiments, the first connecting portion 312 further includes a plurality of first limiting rings 3123, each of which is connected with the first connecting plate 3121, and the plurality of first limiting rings 3123 are arranged at intervals on the outer circumferential side of the first guide rod 3122; one end of the spring body 311 connected with the first connecting portion 312 is respectively arranged in the plurality of first limiting rings 3123; the second connecting portion 313 further includes a plurality of second limiting rings 3133, each of which is connected with the second connecting plate 3131, and the plurality of second limiting rings 3133 are arranged at intervals on the outer circumferential side of the second guide rod 3132; one end of the spring body 311 connected with the second connecting portion 313 is respectively arranged in the plurality of second limiting rings 3133.

[0082] In the embodiment of the present application, by setting the plurality of first limiting rings 3123 and the plurality of second limiting rings 3133, the end of the spring body 311 can be directly inserted into the plurality of limiting rings by rotation, thereby achieving the fixation of the spring body 311 with the first connecting part 312 and the second connecting part 313. At this time, not only is the fixed connection of the spring body 311 facilitated, but also flexible disassembly of the spring body 311 can be achieved. At this time, the spring body 311 can be easily replaced by removing the two ends of the spring body 311 from the plurality of first limiting rings 3123 and the plurality of second limiting rings 3133, respectively. At this time, the spring body 311 can be replaced according to the needs, such as the end of the service life of the corpus luteum, or the replacement of the spring body 311 with different stiffness according to the pressure regulating needs.

[0083] Please refer to Figure 7 and Figure 8 In some embodiments, the first guide rod 3122 is coaxial with the second guide rod 3132.

[0084] In the embodiment of the present application, by setting the first guide rod 3122 and the second guide rod 3132 coaxial, the correct guidance of the spring body 311 can be achieved, and the bending of the spring body 311 during compression can be avoided, thereby effectively ensuring the service life of the spring body 311.

[0085] As shown in Figure 4 In some embodiments, along the axial direction X, the distance between the first guide rod 3122 and the second guide rod 3132 is greater than the distance between the plunger 2 and the bottom wall of the valve body 1.

[0086] In the embodiment of the present application, by setting the distance between the first guide rod 3122 and the second guide rod 3132 greater than the distance between the plunger 2 and the bottom wall of the valve body 1, the maximum movement range of the plunger 2 can be ensured, and the movement distance of the plunger 2 can be avoided from being interfered by the first guide rod 3122 and the second guide rod 3132.

[0087] It can be understood that in the embodiment of the present application, when the plunger 2 moves to abut against the bottom wall of the valve body 1, the side opposite to the first guide rod 3122 and the second guide rod 3132 still has a spacing.

[0088] Please refer to Figure 4 In some embodiments, along the radial direction of the valve body 1, the first spring 31 and the second spring 32 are spaced apart, and the second spring 32 is spaced apart from the side wall of the valve body 1.

[0089] In the embodiment of the present application, the first spring 31 and the second spring 32 are arranged at intervals, and in the compression process of the first spring 31, the first spring 31 expands outward due to deformation, but the distance between the first spring 31 and the second spring 32 provides a deformation space for the first spring 31, thereby avoiding the compression deformation of the first spring 31 from being affected. In addition, the second spring 32 is arranged at intervals with the side wall of the valve body 1, which can also provide a space for the deformation of the second spring 32. The structure can achieve the expected pressure regulation of the pressure regulating device.

[0090] Please refer to Figure 2 and Figure 4 In some embodiments, the plunger 2 has a second accommodating cavity 22, the second accommodating cavity 22 is arranged through the side of the plunger 2 away from the oil inlet hole 12, and the second accommodating cavity 22 is in communication with the first accommodating cavity 11; part of the first spring 31 and part of the second spring 32 are arranged in the second accommodating cavity 22 and connected with the plunger 2; the second spring 32 is arranged at intervals with the inner side wall of the plunger 2.

[0091] In the embodiment of the present application, the second accommodating cavity 22 with the second opening is arranged in the plunger 2, which can absorb part of the size of the elastic assembly 3 along the axial direction X on the basis of ensuring the guiding ability of the plunger 2, so as to further reduce the size of the pressure regulating device along the axial direction X and improve the compactness of the structure of the pressure regulating device.

[0092] As shown in Figure 4 In some embodiments, the second accommodating cavity 22 includes a first sub-cavity 221 and a second sub-cavity 222 in communication, and the second sub-cavity 222 is arranged on the side of the first sub-cavity 221 away from the oil inlet hole 12; the maximum inner diameter of the first sub-cavity 221 is smaller than the minimum inner diameter of the second sub-cavity 222.

[0093] In the embodiment of the present application, the second accommodating cavity 22 is arranged as a combination of the first sub-cavity 221 and the second sub-cavity 222, and the maximum inner diameter of the first sub-cavity 221 is controlled to be smaller than the minimum inner diameter of the second sub-cavity 222, which can further ensure that the pressure regulating device is compact and stable, and has stable pressure regulating capacity.

[0094] Specifically, when the pressure on the plunger 2 is relatively small, the elastic assembly 3 has a relatively small deformation, and at this time, the first sub-cavity 221 with a relatively small inner diameter can fully accommodate the deformation of the second spring 32 and guide and limit the second spring 32, so as to prevent the second spring 32 from being damaged due to bending deformation. Further, when the pressure on the plunger 2 is relatively large, the compression amount of the elastic assembly 3 along the axial direction X increases, and the relative deformation amount also increases, and at this time, the second sub-cavity 222 with a relatively large inner diameter can accommodate the large deformation of the second spring 32 and guide and limit the second spring 32 accordingly, so as to prevent the spring from being damaged due to bending deformation and ensure the effective pressure regulation of the pressure regulating device.

[0095] Please refer to Figures 1-2 In some embodiments, the plunger 2 has a pressure balance hole 23 in communication with the second accommodating cavity 22 and the oil drain hole 13, respectively.

[0096] In the embodiments of the present application, by arranging the pressure balance hole 23, the pressure change caused by the change in the distance between the plunger 2 and the bottom wall of the valve body 1 when the plunger 2 moves along the axial direction X in the first accommodating cavity 11 is balanced, so that the plunger 2 can move smoothly in the first accommodating cavity 11 to perform corresponding pressure regulation.

[0097] Please refer to Figures 3-4 In some embodiments, the oil drain hole 13 includes a first region 131 and a second region 132 in communication, and the first region 131 is arranged on the side of the second region 132 close to the oil inlet hole 12; along the circumferential direction of the valve body 1, the size of the first region 131 is smaller than that of the second region 132.

[0098] In the embodiments of the present application, by arranging the oil drain hole 13 into the first region 131 and the second region 132, and the width of the second region 132 being greater than that of the first region 131, the smooth and effective pressure regulation of the pressure regulating device can be realized by using the first region 131; and by using the second region 132, a larger pressure relief area can be opened when the pressure in the main oil passage is too large, so that faster pressure relief can be realized, thereby effectively protecting the main oil passage, which is equivalent to a safety valve. Therefore, by arranging the oil drain hole 13 formed by the combination of the first region 131 and the second region 132, the pressure regulating device can simultaneously meet the opening pressure requirements of the pressure regulating valve and the safety valve, the combination and integration of the pressure regulating valve and the safety valve can be realized, the structural compactness of the oil system is further improved, and the cost of the oil system is reduced.

[0099] Please refer to Figure 2 and Figure 4In some embodiments, the pressure regulating device further comprises a plunger seat 6 arranged on the valve body 1 at a side of the oil drain hole 13 close to the oil inlet hole 12; at least a part of the plunger seat 6 is arranged at a side of the plunger 2 away from the elastic assembly 3, and the plunger seat 6 is capable of sealingly abutting against the plunger 2; the plunger seat 6 has a through hole 61 capable of communicating with the oil inlet hole 12 and the oil drain hole 13.

[0100] In the embodiments of the present application, the plunger seat 6 can limit the plunger 2, and the plunger seat 6 and the plunger 2 can cooperate to close the pressure regulating device when the pressure in the main oil passage is normal, so as to close the oil drain hole 13 and the oil inlet hole 12, and prevent the oil from flowing out.

[0101] It should be noted that in the embodiments of the present application, the plunger seat 6 can limit and seal the plunger 2, and when there is a gap between the plunger 2 and the plunger seat 6, the through hole 61 can communicate the oil inlet hole 12 and the oil drain hole 13, so as to smoothly drain the oil in the main oil passage.

[0102] As shown in FIG. 1, Figure 4 In some embodiments, the plunger 2 comprises a first section 24 and a second section 25, the second section 25 is connected to a side of the first section 24 away from the oil inlet hole 12; when the plunger seat 6 abuts against the plunger 2, at least a part of the oil drain hole 13 is arranged opposite to the first section 24; the outer diameter of the second section 25 is greater than that of the first section 24, and there is an oil drain gap 7 between the outer side wall of the first section 24 and the inner side wall of the valve body 1, the oil drain gap 7 communicates with the oil drain hole 13.

[0103] In the embodiments of the present application, the plunger 2 is divided into the first section 24 and the second section 25, and the outer diameter of the second section 25 is greater than that of the first section 24, so that the distance between the second section 25 and the inner side wall of the valve body 1 is smaller than the distance between the first section 24 and the inner side wall of the valve body 1. The gap between the second section 25 and the inner side wall of the valve body 1 can guide the movement of the plunger 2 in the first accommodating cavity 11. The gap between the first section 24 and the inner side wall of the valve body 1 is the oil drain gap 7. When the plunger 2 moves in the axial direction X into the first accommodating cavity 11, a gap appears between the plunger 2 and the plunger seat 6, which can communicate with the oil drain gap 7, and the oil drain gap 7 communicates with the oil drain hole 13. In this way, the oil drain hole 13 can have a larger oil drain area when the pressure in the main oil passage increases slightly, so as to smoothly drain the oil in the main oil passage.

[0104] It should be noted that the outer diameter of the first section 24 is smaller than that of the second section 25, so that the distance between the first section 24 and the inner side wall of the valve body 1 is larger, and the movement of the plunger 2 is guided only by the cooperation between the second section 25 and the inner side wall of the valve body 1, which can reduce the possibility of the plunger 2 being stuck in the first accommodating cavity 11 during movement.

[0105] It should be further noted that in the embodiments of the present application, at least part of the oil drain hole 13 is arranged opposite to the first section 24, at this time, only the first area 131 can be arranged opposite to the first section 24, and the second area 132 is arranged opposite to the second section 25, or the first area 131 and the second area 132 are both arranged opposite to the first section 24, and the length of the first section 24 and the second section 25 can be adjusted according to actual needs. Among them, when the first area 131 and the second area 132 are both arranged opposite to the first section 24, at this time, the oil drain gap 7 is in communication with the entire oil drain hole 13, which is more conducive to the rapid drainage of oil in the initial stage; at the same time, in this case, the length of the second section 25 is compressed, and the possibility of jamming when the second section 25 is guided by the valve body 1 is further reduced.

[0106] As shown in Figure 9 In some embodiments, the side of the plunger 2 close to the plunger seat 6 is provided with a first transition surface 26, and the side of the plunger seat 6 facing the plunger 2 is provided with a second transition surface 62, the first transition surface 26 can be sealed and fitted with the second transition surface 62; the second transition surface 62 is used to surround the through hole 61, and part of the plunger 2 is arranged in the through hole 61.

[0107] In the embodiments of the present application, by arranging the first transition surface 26 and the second transition surface 62, the mutual cooperation and sealing between the plunger seat 6 and the plunger 2 can be realized, and the sealing area is relatively large, and part of the plunger 2 is arranged in the through hole 61, which can further absorb the dimension of the plunger 2 along the axial direction X, thereby further improving the overall structural compactness of the pressure regulating device.

[0108] In some embodiments, when the plunger seat 6 abuts against the plunger 2, the first spring 31 is in a stretched state, and the second spring 32 is in a compressed state.

[0109] In the embodiments of the present application, when the plunger 2 abuts against the plunger seat 6, at this time, the first spring 31 is limited to be in a stretched state, and the second spring 32 is in a compressed state, and the two cooperate with each other, at this time, the pushing force of the second spring 32 on the plunger 2 is greater than the pulling force of the first spring 31 on the plunger 2, therefore, the elastic assembly 3 as a whole can have a pre-tightening force on the plunger 2, thereby realizing the sealed abutment of the plunger 2 and the plunger seat 6. At the same time, the force of the elastic assembly 3 on the plunger 2 at this time is relatively small, thereby realizing rapid response pressure regulation when the main oil passage pressure increases.

[0110] Please refer to Figures 1-4 In some embodiments, the valve body 1 has a plurality of oil drain holes 13, and the plurality of oil drain holes 13 are arranged at intervals along the circumference of the valve body 1.

[0111] In the embodiments of the present application, by arranging a plurality of oil drain holes 13, simultaneous oil drainage and pressure reduction in multiple directions can be realized, thereby improving the pressure regulating capacity of the pressure regulating device.

[0112] Correspondingly, the diesel engine of the embodiment of the application comprises an oil system and the pressure regulating device of any one of the preceding embodiments, and the pressure regulating device is arranged in the oil system and is used for regulating the pressure in the oil system.

[0113] It can be understood that the diesel engine of the embodiment of the application comprises all the technical features and technical effects of the pressure regulating device of the preceding embodiments, which will not be described herein.

[0114] The diesel engine can realize rapid pressure regulation of the oil system of the diesel engine, has a large pressure regulation range, and can make the structure of the oil system more compact by arranging the pressure regulating device of the embodiment of the application.

[0115] The pressure regulating device in the embodiment of the application can divide the working state of the pressure regulating device according to the stroke X of the plunger 2 when regulating pressure, and details can be referred to Figure 10 . When the pressure regulating device is closed, the moving position of the plunger 2 is X=X0; when the pressure regulating device is half open, the moving position of the plunger 2 is X=X1; and when the pressure regulating device is fully open, the moving position of the plunger 2 is X=X2. The following four stages are divided:

[0116] 1) When X=X0, the main oil passage pressure P is less than the pressure regulating device opening pressure P0, the diesel engine is in a low-medium speed state, the first spring 31 is in a stretched state, the second spring 32 is in a compressed state, the pressure regulating device is in a closed state, and the oil is not discharged.

[0117] 2) When X0X1, the pressure regulating device opening pressure P0 is less than the main oil passage pressure P, which is less than the pressure regulating device rated working pressure P1, the diesel engine is in a high speed state. The second spring 32 (with a stiffness K1) is in a compressed state, the first spring 31 (with a stiffness K2) is in a stretched state, the overall stiffness of the elastic assembly 3 is K=K1-K2, and the overall stiffness of the elastic assembly 3 is small. At this time, the pressure regulating device responds quickly, which is conducive to stabilizing the main oil passage pressure in the high speed state.

[0118] 3) X=X1, the main oil passage pressure P=P1, corresponding to the rated speed of the diesel engine. The second spring 32 (stiffness K1) is in compression, and the first spring 31 (stiffness K2) is in free state. In this state, when the main oil passage pressure fluctuates, the first spring 31 can provide negative feedback adjustment to the plunger 2, reducing the axial X displacement of the plunger 2 when the pressure fluctuates. Specifically: a) when the oil pressure fluctuates to P>P1, the second spring 32 and the first spring 31 are in compression, the stiffness of the elastic assembly 3 combined increases, increasing the thrust of the elastic assembly 3 to the plunger 2, so that the plunger 2 is not easy to displace to the inside of the first accommodating cavity 11 of the valve body 1; when the oil pressure fluctuates to P<P1, the second spring 32 is in compression and the first spring 31 is in tension, the stiffness of the elastic assembly 3 decreases, reducing the thrust of the elastic assembly 3 to the plunger 2, so that the plunger 2 is not easy to displace to the oil inlet hole 12 of the valve body 1, thereby realizing stable operation of the plunger 2.

[0119] 4) X1X≤X2. At this time, the rated working pressure P1 of the pressure regulating device is less than the main oil passage pressure P. The second spring 32 (stiffness K1) and the first spring 31 (stiffness K2) are both in compression, the stiffness K of the elastic assembly 3 is K1+K2, and the overall stiffness of the elastic assembly 3 is relatively large. At this time, the pressure regulating device has a large range of pressure regulating capability. If when X=X2, the maximum working pressure P2 of the pressure regulating device is greater than the opening pressure of the safety valve, the pressure regulating device can integrate the safety valve function, and the diesel engine does not need to be arranged with a separate safety valve.

[0120] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0121] The pressure regulating device and the diesel engine provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressure regulating device, characterized by, The pressure regulating device comprises: a valve body (1) having a first accommodating cavity (11), an oil inlet hole (12) and an oil outlet hole (13) in communication with each other; a plunger (2) arranged in the first accommodating cavity (11); the plunger (2) is movable along an axial direction (X) of the valve body (1) to connect or disconnect the oil inlet hole (12) and the oil outlet hole (13); an elastic assembly (3) arranged in the first accommodating cavity (11) and comprising: a first spring (31) connected with the valve body (1) and the plunger (2) along the axial direction (X) respectively; the first spring (31) is stretchable or compressible along the axial direction (X); a second spring (32) arranged around an outer circumferential side of the first spring (31) and abutting against the valve body (1) and the plunger (2) along the axial direction (X); the second spring (32) is compressible along the axial direction (X); wherein, when the pressure regulating device is in a closed state, the first spring (31) is in a stretched state and the second spring (32) is in a compressed state; when the pressure regulating device is in a half-open state, the second spring (32) is in a compressed state and the first spring (31) is in a free state; in this state, when there is fluctuation in a main oil passage pressure, the first spring (31) can provide negative feedback regulation to the plunger (2) to reduce the displacement of the plunger (2) along the axial direction (X) when the pressure fluctuates; when the pressure regulating device is in a fully open state, the first spring (31) and the second spring (32) are both in a compressed state.

2. The pressure regulating device of claim 1, wherein, The first spring (31) comprises: a spring body (311); a first connecting part (312) connected with the spring body (311) and the valve body (1) respectively; a second connecting part (313) arranged at an end of the spring body (311) away from the first connecting part (312) and connected with the spring body (311) and the plunger (2) respectively.

3. The pressure regulating device according to claim 2, wherein: the first connecting part (312) comprises: a first connecting plate (3121) connected with the spring body (311) and the valve body (1) respectively; a first guide rod (3122) connected to one side of the first connecting plate (3121) facing the spring body (311), the first guide rod (3122) being arranged in the spring body (311); the second connecting part (313) comprises: a second connecting plate (3131) connected with the spring body (311) and the plunger (2) respectively; a second guide rod (3132) connected to one side of the second connecting plate (3131) facing the spring body (311), the second guide rod (3132) being arranged in the spring body (311).

4. The pressure regulating device of claim 3, wherein, The pressure regulating device further comprises: a first connecting member (4) connected with the first connecting part (312) and the valve body (1); a second connecting member (5) connected with the second connecting part (313) and the plunger (2).

5. The pressure regulating device according to claim 3, characterized in that, the valve body (1) is provided with a first limiting portion (14) on one side thereof along the axial direction (X) towards the first connecting plate (3121), the first connecting plate (3121) is provided with a first limiting groove (31211), and the first limiting portion (14) is inserted into the first limiting groove (31211); the plunger (2) is provided with a second limiting portion (21) on one side thereof along the axial direction (X) towards the second connecting plate (3131), the second connecting plate (3131) is provided with a second limiting groove (31311), and the second limiting portion (21) is inserted into the second limiting groove (31311).

6. The pressure regulating device according to claim 5, characterized in that, the valve body (1) is provided with a plurality of first limiting portions (14), the plurality of first limiting portions (14) are arranged around the spring body (311); the first connecting plate (3121) is provided with a plurality of first limiting grooves (31211), the plurality of first limiting grooves (31211) are arranged around the first guide rod (3122), and each first limiting portion (14) is inserted into one first limiting groove (31211); the plunger (2) is provided with a plurality of second limiting portions (21), the plurality of second limiting portions (21) are arranged around the spring body (311); the second connecting plate (3131) is provided with a plurality of second limiting grooves (31311), the plurality of second limiting grooves (31311) are arranged around the second guide rod (3132), and each second limiting portion (21) is inserted into one second limiting groove (31311).

7. The pressure regulating device according to claim 3, characterized in that, the first connecting portion (312) further comprises a plurality of first limiting rings (3123), each of the plurality of first limiting rings (3123) is connected with the first connecting plate (3121), the plurality of first limiting rings (3123) are arranged at intervals on the outer circumferential side of the first guide rod (3122), and the end of the spring body (311) connected with the first connecting portion (312) is respectively arranged in the plurality of first limiting rings (3123); the second connecting portion (313) further comprises a plurality of second limiting rings (3133), each of the plurality of second limiting rings (3133) is connected with the second connecting plate (3131), the plurality of second limiting rings (3133) are arranged at intervals on the outer circumferential side of the second guide rod (3132), and the end of the spring body (311) connected with the second connecting portion (313) is respectively arranged in the plurality of second limiting rings (3133).

8. The pressure regulating device of claim 3, wherein, the first guide rod (3122) and the second guide rod (3132) are coaxial.

9. The pressure regulating device of claim 3, wherein, along the axial direction (X), the distance between the first guide rod (3122) and the second guide rod (3132) is greater than the distance between the plunger (2) and the bottom wall of the valve body (1).

10. The pressure regulating device of claim 1, wherein, The first spring (31) and the second spring (32) are arranged in the radial direction of the valve body (1), and the second spring (32) is arranged in the radial direction of the valve body (1) and is spaced from the side wall of the valve body (1).

11. The pressure regulating device according to claim 10, characterized in that, The plunger (2) has a second accommodating cavity (22) which is arranged on the side of the plunger (2) away from the oil inlet hole (12) and is in communication with the first accommodating cavity (11). Part of the first spring (31) and part of the second spring (32) are arranged in the second accommodating cavity (22) and are connected with the plunger (2); the second spring (32) is arranged in the radial direction of the plunger (2) and is spaced from the inner side wall of the plunger (2).

12. The pressure regulating device of claim 11, wherein, The second accommodating cavity (22) comprises a first sub-cavity (221) and a second sub-cavity (222) which are in communication, and the second sub-cavity (222) is arranged on the side of the first sub-cavity (221) away from the oil inlet hole (12); the maximum inner diameter of the first sub-cavity (221) is smaller than the minimum inner diameter of the second sub-cavity (222).

13. The pressure regulating device of claim 11, wherein, The plunger (2) has a pressure balance hole (23) which is in communication with the second accommodating cavity (22) and the oil outlet hole (13) respectively.

14. The pressure regulating device of claim 1, wherein, The oil outlet hole (13) comprises a first region (131) and a second region (132) which are in communication, the first region (131) is arranged on the side of the second region (132) close to the oil inlet hole (12); along the circumferential direction of the valve body (1), the size of the first region (131) is smaller than the size of the second region (132).

15. The pressure regulating device of claim 1, wherein, The pressure regulating device further comprises a plunger seat (6) which is arranged on the side of the oil outlet hole (13) close to the oil inlet hole (12) and is connected with the valve body (1); at least part of the plunger seat (6) is arranged on the side of the plunger (2) away from the elastic assembly (3), the plunger seat (6) can be in sealing abutment with the plunger (2); the plunger seat (6) has a through hole (61) which can be in communication with the oil inlet hole (12) and the oil outlet hole (13).

16. The pressure regulating device of claim 15, wherein, The plunger (2) comprises a first section (24) and a second section (25), the second section (25) is connected to the side of the first section (24) away from the oil inlet hole (12); when the plunger seat (6) is in abutment with the plunger (2), at least part of the oil outlet hole (13) is arranged opposite to the first section (24); the outer diameter of the second section (25) is greater than the outer diameter of the first section (24), and the outer side wall of the first section (24) and the inner side wall of the valve body (1) have an oil leakage gap (7) therebetween, and the oil leakage gap (7) is in communication with the oil outlet hole (13).

17. The pressure regulating device of claim 15, wherein, The plunger (2) is provided with a first transition surface (26) on one side close to the plunger seat (6), the plunger seat (6) is provided with a second transition surface (62) on one side facing the plunger (2), the first transition surface (26) can be sealed and fitted with the second transition surface (62); the second transition surface (62) is used to enclose the through hole (61), and part of the plunger (2) is arranged in the through hole (61).

18. The pressure regulating device of claim 15, wherein, When the plunger seat (6) abuts against the plunger (2), the first spring (31) is in a stretched state, and the second spring (32) is in a compressed state.

19. The pressure regulating device of claim 1, wherein, The valve body (1) has a plurality of oil leakage holes (13), and the plurality of oil leakage holes (13) are arranged at intervals along the circumference of the valve body (1).

20. A diesel engine characterized by comprising: The pressure regulating device as claimed in any one of claims 1-19 is arranged in the lubricating oil system and used for regulating the pressure in the lubricating oil system.

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