Pressure adjusting device and diesel engine

Abstract

The invention 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 containing cavity, an oil inlet hole and an oil drainage hole which communicate with one another, and the plunger is arranged in the first containing cavity; the plunger can move in the axial direction of the valve body so that the oil inlet hole and the oil drainage hole can be communicated or disconnected. The elastic assembly is arranged in the first containing cavity and comprises a first spring and a second spring, the first spring is connected with the valve body and the plunger in the axial direction, and the first spring can be stretched or compressed in the axial direction; the second spring is arranged on the peripheral side of the first spring in a surrounding mode and abuts against the valve body and the plunger in the axial direction. The second spring can be compressed in the axial direction. Through the combination of the first spring capable of being stretched or compressed in the axial direction and the second spring capable of being compressed in the axial direction, the first spring is inserted into the second spring, so that the overall structure is compact, the pressure adjusting range is enlarged, response can be fast, and work is stable.

Description

Technical Field

[0001] The present application belongs to the technical field of pressure regulation, and in particular relates to a pressure regulating device and a diesel engine. Background Art

[0002] The lubricating oil system is one of the main guarantees for the operation of diesel engines, and is responsible for reducing the friction and cooling of the main moving parts of diesel engines. During the design of the lubricating oil system, affected by the performance characteristics of the lubricating oil pump, a pressure regulating valve or pressure regulating device needs to be arranged to bypass the lubricating oil at high speeds to prevent wear, leakage and other faults caused by excessive lubricating oil pressure. However, in order to ensure that the pressure regulating valve has a faster response speed, the spring of the pressure regulating valve needs to have a larger mean diameter and number of turns. At this time, the spring size is large, and the corresponding outer dimensions of the pressure regulating valve are also large, which cannot be applied to the compact diesel engine lubricating oil system. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a pressure regulating device, aiming to solve the problem that the existing pressure regulating devices have a large overall structural size when having a faster response speed and cannot be applied to the compact diesel engine lubricating oil system; another purpose of the embodiment of the present application is to provide a diesel engine.

[0004] Technical solution: A pressure regulating device described in an embodiment of the present application includes:

[0005] The valve body comprises a first accommodating cavity, an oil inlet hole and an oil drain hole which are interconnected;

[0006] A plunger is disposed in the first accommodating chamber; the plunger can move along the axial direction of the valve body to connect or disconnect the oil inlet hole and the oil drain hole;

[0007] The elastic component is disposed in the first accommodating cavity and comprises:

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

[0009] The second spring is arranged around the outer peripheral side of the first spring and abuts against the valve body and the plunger respectively along the axial direction; the second spring can be compressed along the axial direction.

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

[0011] Spring body;

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

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

[0014] In some embodiments,

[0015] The first connecting portion comprises:

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

[0017] A first guide rod, connected to a side of the first connecting plate facing the spring body, the first guide rod being inserted into the spring body;

[0018] The second connection portion comprises:

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

[0020] A second guide rod is connected to a side of the second connecting plate facing the spring body, and the second guide rod is penetrated in the spring body.

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

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

[0023] The second connecting member is connected to the second connecting portion and the plunger.

[0024] In some embodiments,

[0025] The valve body is provided with a first limiting portion on one side thereof along the axial direction facing the first connecting plate, the first connecting plate is provided with a first limiting groove, and the first limiting portion is inserted into the first limiting groove;

[0026] The plunger is provided with a second limiting portion on one side thereof along the axial direction facing the second connecting plate, the second connecting plate is provided with a second limiting groove, and the second limiting portion is inserted into the second limiting groove.

[0027] In some embodiments,

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

[0029] The plunger is provided with a plurality of the second limiting parts, which are arranged around the spring body; the second connecting plate is provided with a plurality of the second limiting grooves, which are arranged around the second guide rod, and each of the second limiting parts is inserted into a second limiting groove.

[0030] In some embodiments,

[0031] The first connecting portion further includes a plurality of first limiting rings, each of which is connected to the first connecting plate, and the plurality of first limiting rings are arranged at intervals on the outer peripheral side of the first guide rod; one end of the spring body connected to the first connecting portion is respectively inserted into the plurality of first limiting rings;

[0032] The second connecting part also includes a plurality of second limiting rings, which are all connected to the second connecting plate and are arranged at intervals on the outer peripheral side of the second guide rod; one end of the spring body connected to the second connecting part is respectively passed through the plurality of second limiting rings.

[0033] In some embodiments, the first guide rod is coaxial with the second guide rod.

[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 spaced apart, and the second spring is spaced apart from the side wall of the valve body.

[0036] In some embodiments,

[0037] The plunger has a second accommodating cavity, the second accommodating cavity runs through a side of the plunger away from the oil inlet hole, and the second accommodating cavity is communicated 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 to the plunger; the second spring is spaced apart from the inner side wall of the plunger.

[0039] In some embodiments, the second accommodating chamber includes a first sub-chamber and a second sub-chamber that are connected, and the second sub-chamber is arranged on a side of the first sub-chamber away from the oil inlet hole; the maximum inner diameter of the first sub-chamber is smaller than the minimum inner diameter of the second sub-chamber.

[0040] In some embodiments, the plunger has a pressure balance hole, and the pressure balance hole is connected to the second accommodating chamber and the oil drain hole respectively.

[0041] In some embodiments, the oil drain hole includes a first area and a second area that are connected, and the first area is arranged on a side of the second area close to the oil inlet hole; along the circumference 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 also includes a plunger seat, which is arranged on a side of the oil drain hole close to the oil inlet hole and connected to the valve body; at least a portion of the plunger seat is arranged on a side of the plunger away from the elastic component, and the plunger seat can be sealingly abutted against the plunger; the plunger seat has a through hole, which can be connected to the oil inlet hole and the oil drain hole.

[0043] In some embodiments, the plunger includes a first section and a second section, the second section is connected to a side of the first section away from the oil inlet hole; when the plunger seat abuts the plunger, at least a portion of the oil drain hole is arranged opposite to the first section; the outer diameter of the second section is greater than the outer diameter of the first section, and an oil drain gap is provided between the outer side wall of the first section and the inner side wall of the valve body, and the oil drain gap is connected to the oil drain hole.

[0044] In some embodiments, a first transition surface is provided on the side of the plunger close to the plunger seat, and a second transition surface is provided on the side of the plunger seat facing the plunger, and the first transition surface can be sealed and fitted with the second transition surface; the second transition surface is used to enclose the through hole, and part of the plunger is passed through 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 the oil leakage holes, and the plurality of the oil leakage holes are arranged at intervals along the circumference of the valve body.

[0047] Accordingly, a diesel engine described in an embodiment of the present application includes a lubricating oil system and a pressure regulating device as described in any one of the aforementioned embodiments, wherein the pressure regulating device is arranged in the lubricating oil system to regulate the pressure in the lubricating oil system.

[0048] Beneficial effect: Compared with the prior art, a pressure regulating device in an embodiment of the present application includes a valve body, a plunger and an elastic component, the valve body has a first accommodating chamber, an oil inlet hole and an oil drain hole that are interconnected, and the plunger is arranged in the first accommodating chamber; the plunger can move along the axial direction of the valve body to connect or disconnect the oil inlet hole and the oil drain hole; the elastic component is arranged in the first accommodating chamber and includes a first spring and a second spring, the first spring is connected to the valve body and the plunger in the axial direction respectively, and the first spring can be stretched or compressed in the axial direction; the second spring is arranged around the outer peripheral side of the first spring and abuts against the valve body and the plunger in the axial direction respectively; the second spring can be compressed in the axial direction. The present application arranges the elastic component into a combination of the first spring and the second spring, and the first spring can be stretched or compressed in the axial direction, the second spring can be compressed in the axial direction, and the first spring is inserted in the second spring. In this way, through the joint action of the combination of the first spring and the second spring, not only the size of the elastic component can be reduced, but also the overall size of the pressure regulating device can be reduced accordingly, so as to achieve a compact structure, and at the same time, compared with the pressure regulating device with only the second spring, the pressure regulating range is effectively increased. Through the negative feedback of the first spring on the plunger, the axial displacement of the plunger caused by the instantaneous fluctuation of the main oil channel pressure during operation can be reduced, the influence of the pressure regulating device on the main oil channel lubricating oil pressure can be reduced, and the main oil channel pressure can be stabilized.

[0049] Compared with the prior art, a diesel engine in an embodiment of the present application includes a lubricating oil system and a pressure regulating device as described in any one of the above embodiments, wherein the pressure regulating device is arranged in the lubricating oil system and is used to regulate the pressure in the lubricating oil system. It is understandable that the diesel engine in the embodiment of the present application includes all the technical features and technical effects of the above pressure regulating device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 It is a schematic diagram of the overall structure of a pressure regulating device according to an embodiment of the present application;

[0052] Figure 2 is an exploded diagram of a pressure regulating device according to an embodiment of the present application;

[0053] Figure 3 is a side view of a pressure regulating device according to an embodiment of the present application;

[0054] Figure 4 yes Figure 3Section view of the AA section line;

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

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

[0057] Figure 7 is a schematic diagram of the overall structure of a first spring in an embodiment of the present application;

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

[0059] Fig. 9 yes Figure 4 A magnified view of part D in the middle;

[0060] Fig.10 It is a schematic diagram of the working state of a pressure regulating device according to an embodiment of the present application.

[0061] Figure numerals: 1, valve body; 11, first accommodating chamber; 12, oil inlet hole; 13, oil drain hole; 131, first area; 132, second area; 14, first limiting portion; 2, plunger; 21, second limiting portion; 22, second accommodating chamber; 221, first sub-chamber; 222, second sub-chamber; 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 Connecting part; 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 member; 5, second connecting member; 6, plunger seat; 61, through hole; 62, second transition surface; 7, oil leakage gap; X, axial direction. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0063] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0064] In diesel engine related technologies, the lubricating oil system is one of the main guarantees for the operation of diesel engines, and is responsible for reducing the friction and cooling of the main moving parts of diesel engines. In the design process of the lubricating oil system, affected by 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 faults caused by excessive lubricating oil pressure. However, the pressure regulating valve is affected by the spring selection and its structure is not compact enough. In the design process of the pressure regulating valve, if a compact spring is required, the spring center diameter, number of turns, etc. need to be reduced, and the spring stiffness will increase accordingly, resulting in a slow pressure regulation response; if the spring stiffness needs to be reduced and the pressure regulation response speed needs to be accelerated, a larger center diameter and number of turns need to be selected, which will inevitably lead to an increase in the size of the spring, and the outer dimensions of the pressure regulating valve need to be increased accordingly, which cannot be applied to a compact lubricating oil system.

[0065] In view of this, an embodiment of the present application provides a pressure regulating device to solve the above-mentioned problem.

[0066] Please refer to Figure 1-Figure 8The embodiment of the present application provides a pressure regulating device, including a valve body 1, a plunger 2 and an elastic component 3. The valve body 1 has a first accommodating chamber 11, an oil inlet hole 12 and an oil drain hole 13 that are interconnected. The plunger 2 is arranged in the first accommodating chamber 11; the plunger 2 can move along the axial direction X of the valve body 1 to connect or disconnect the oil inlet hole 12 and the oil drain hole 13; the elastic component 3 is arranged in the first accommodating chamber 11 and includes a first spring 31 and a second spring 32. The first spring 31 is respectively connected to the valve body 1 and the plunger 2 along the axial direction X, and the first spring 31 can be stretched or compressed along the axial direction X; the second spring 32 is arranged around the outer peripheral side of the first spring 31, and abuts against the valve body 1 and the plunger 2 along the axial direction X; the second spring 32 can be compressed along the axial direction X.

[0067] In the embodiment of the present application, the elastic component 3 is set as a combination of a first spring 31 and a second spring 32, and the first spring 31 can be stretched or compressed along the axial direction X, the second spring 32 can be compressed along the axial direction X, and the first spring 31 is inserted in the second spring 32. In this way, through the combined effect of the first spring 31 and the second spring 32, not only the size of the elastic component can be reduced, but also the overall size of the pressure regulating device can be reduced accordingly, so as to achieve a compact structure. At the same time, compared with the pressure regulating device with only the second spring 32, the pressure regulating range is effectively increased. In addition, through the negative feedback of the first spring 31 on the plunger 2, the axial displacement of the plunger 2 during operation can be reduced, the influence of the pressure regulating device on the lubricating oil pressure of the main oil gallery can be reduced, and the pressure of the main oil gallery can be stabilized.

[0068] Specifically, in the embodiment of the present application, by setting a spring combination mode in which the first spring 31 is nested in the second spring 32, the volume of the elastic component 3 along the axial direction X can be reduced, and when the main oil channel of the lubricating oil system is pressure-regulated, the first spring 31 and the second spring 32 are combined and act at the same time, so that the pressure regulating device has a larger pressure regulating range. Among them, in some embodiments, when the first spring 31 is in a stretched state and the second spring 32 is in a compressed state, the first spring 31 and the second spring 32 have opposite forces on the plunger 2, and the tension of the first spring 31 is used to offset part of the thrust of the second spring 32, which is equivalent to reducing the thrust of the second spring 32. At the same time, the overall stiffness of the elastic component 3 is smaller than that when there is only the second spring 32. At this time, the pressure regulating device can achieve rapid response when the pressure in the main oil channel increases, which is conducive to stabilizing the main oil channel pressure of the diesel engine at high speed. Furthermore, when the first spring 31 is in a compressed state and the second spring 32 is in a compressed state, the first spring 31 and the second spring 32 simultaneously apply thrust to the plunger 2, and the overall stiffness of the elastic component 3 increases, making it difficult for the plunger 2 to move toward the inside of the valve body 1, thereby enabling the pressure regulating device to have a larger pressure regulating range.

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

[0070] Please refer to Figure 7 and Figure 8 In the embodiment of the present application, the first connecting portion 312 is provided to realize the fixed connection between the spring body 311 and the valve body 1, and the second connecting portion 313 is provided to realize the connection between the spring body 311 and the plunger 2. The spring body 311 can be stretched or compressed along the axial direction X in the first accommodating chamber 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, so that the first spring 31 can play a pressure regulating role.

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

[0072] In the embodiment of the present application, the first connecting plate 3121 is provided to realize that the first connecting portion 312 has a larger contact connection area with the valve body 1, thereby ensuring the stability of the first connecting portion 312 and the valve body 1; the second connecting plate 3131 is provided to realize that the second connecting portion 313 has a larger contact area with the plunger 2, thereby ensuring the stability of the second connecting portion 313 and the plunger 2; in this way, the stability of the connection and fixation of the first spring 31 with the valve body 1 and the plunger 2 can be ensured during the movement of the plunger 2. The first guide rod 3122 and the second guide rod 3132 are provided to guide the spring body 311 during the stretching or compression of the spring body 311, thereby preventing the spring body 311 from deforming and bending during the compression process due to the small middle diameter and relatively long size of the spring body 311, thereby reducing or even losing the force on the plunger 2, thereby avoiding affecting the pressure regulating ability and pressure regulating stability of the plunger 2, and can help to evenly force the spring body 311, effectively protecting the service life of the spring body 311.

[0073] Please refer to Figure 1-Figure 6In some embodiments, the pressure regulating device further includes a first connecting member 4 and a second connecting member 5 , wherein the first connecting member 4 is connected to the first connecting portion 312 and the valve body 1 , and the second connecting member 5 is connected to the second connecting portion 313 and the plunger 2 .

[0074] In the embodiment of the present application, by providing the first connecting member 4 and the second connecting member 5, the first spring 31 can be effectively connected to the valve body 1 and the plunger 2. The first connecting member 4 and the second connecting member 5 can both be bolts, and correspondingly, a through hole 61 can be opened on the valve body 1 and the plunger 2, and threaded holes can be opened on the first connecting portion 312 and the second connecting portion 313, wherein the first connecting member 4 is penetrated through the through hole on the valve body 1 and the threaded hole on the first connecting portion 312 and tightened to achieve an effective fixed connection between the first spring 31 and the valve body 1, and the second connecting member 5 is penetrated through the through hole on the plunger 2 and the threaded hole on the second connecting portion 313 and tightened to achieve an effective fixed connection between the first spring 31 and the plunger 2.

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

[0076] Please refer to Figure 5-Figure 8 In some embodiments, a first limiting portion 14 is provided on one side of the valve body 1 along the axial direction X toward 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; a second limiting portion 21 is provided on one side of the plunger 2 along the axial direction X toward 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.

[0077] In the embodiment of the present application, by setting the first limiting portion 14 and the first limiting groove 31211 to cooperate, and the second limiting portion 21 and the second limiting groove 31311 to cooperate, the first connection portion 312 and the second connection portion 313 can be limited and positioned preferentially when the first spring 31 is assembled. At this time, when the first connecting member 4 and the second connecting member 5 are screwed together, the first connection portion 312 and the second connection portion 313 can be prevented from rotating, thereby preventing the spring body 311 from twisting, facilitating the installation of the first spring 31, and ensuring that the first spring 31 is not subjected to twisting force when working, thereby achieving the expected pressure adjustment range of the elastic component 3 as a whole.

[0078] Please continue to refer to Figure 5-Figure 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 a 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 a second limiting groove 31311.

[0079] In the embodiment of the present application, by providing a plurality of first limiting portions 14 and a plurality of first limiting grooves 31211, and a plurality of second limiting portions 21 and a plurality of second limiting grooves 31311, the flexibility of the installation and positioning of the first spring 31 can be improved, and the positioning and limiting of the first connecting portion 312 and the valve body 1 can be facilitated.

[0080] Specifically, in the embodiment of the present application, there may be two first limiting portions 14 and two second limiting portions 21, and the number of first limiting grooves 31211 and second limiting grooves 31311 may be multiples of two. In this case, one group of two first limiting grooves 31211 is used to cooperate with the two first limiting portions 14 for positioning and limiting, and one group of two second limiting grooves 31311 is used to cooperate with the two second limiting portions 21 for positioning and limiting. There may be multiple groups of first limiting grooves 31211 and multiple groups of second limiting grooves 31311. The embodiment of the present application and the accompanying drawings are shown by taking two groups, that is, four first limiting grooves 31211 and second limiting grooves 31311 as an example.

[0081] Please refer to Figure 5-Figure 8 In some embodiments, the first connection part 312 also includes a plurality of first limiting rings 3123, which are all connected to the first connection plate 3121 and are spaced apart on the outer peripheral side of the first guide rod 3122; one end of the spring body 311 connected to the first connection part 312 is respectively passed through the plurality of first limiting rings 3123; the second connection part 313 also includes a plurality of second limiting rings 3133, which are all connected to the second connection plate 3131 and are spaced apart on the outer peripheral side of the second guide rod 3132; one end of the spring body 311 connected to the second connection part 313 is respectively passed through the plurality of second limiting rings 3133.

[0082] In the embodiment of the present application, by providing a plurality of first limiting rings 3123 and a plurality of second limiting rings 3133, the spring body 311 can be fixed to the first connection portion 312 and the second connection portion 313 by directly rotating and inserting the end of the spring body 311 into the plurality of limiting rings. At this time, it is not only convenient for the fixed connection of the spring body 311, but also can realize the flexible disassembly of the spring body 311. At this time, the two ends of the spring body 311 can be removed from the plurality of first limiting rings 3123 and the plurality of second limiting rings 3133 respectively, so as to facilitate the replacement of the spring body 311. At this time, the spring body 311 can be replaced according to demand, such as when the service life of the spring body 311 ends, or when the spring body 311 of different stiffness is replaced according to the voltage regulation demand.

[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 arranging the first guide rod 3122 and the second guide rod 3132 to be coaxial, the spring body 311 can be correctly guided, and the spring body 311 can be prevented from bending during the compression process, thereby effectively ensuring the service life of the spring body 311.

[0085] like Figure 4 As shown, 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 to be greater than the distance between the plunger 2 and the bottom wall of the valve body 1, it is possible to ensure that the plunger 2 has a maximum range of movement, thereby avoiding interference between the first guide rod 3122 and the second guide rod 3132 on the movement distance of the plunger 2.

[0087] It is understandable that, in the embodiment of the present application, when the plunger 2 moves to abut against the bottom wall of the valve body 1 , there is still a gap between the first guide rod 3122 and the second guide rod 3132 on the side opposite to each other.

[0088] See also 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 and the side wall of the valve body 1 are spaced apart.

[0089] In the embodiment of the present application, the first spring 31 and the second spring 32 are arranged at intervals. At this time, during the compression process of the first spring 31, although the first spring 31 will expand outward due to deformation, since there is a distance between the first spring 31 and the second spring 32, the distance can provide deformation space for the first spring 31, thereby preventing the compression deformation of the first spring 31 from being affected. In addition, the second spring 32 is arranged at intervals from the side wall of the valve body 1, which can also provide space for the deformation of the second spring 32. This structural setting 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 chamber 22, which passes through a side of the plunger 2 away from the oil inlet hole 12, and the second accommodating chamber 22 is connected to the first accommodating chamber 11; a portion of the first spring 31 and a portion of the second spring 32 are arranged in the second accommodating chamber 22 and connected to the plunger 2; the second spring 32 is spaced apart from the inner side wall of the plunger 2.

[0091] In the embodiment of the present application, a second accommodating cavity 22 with a second opening is provided in the plunger 2. At this time, on the basis of ensuring the guiding ability of the plunger 2 itself, the elastic component 3 is partially provided in the second accommodating cavity 22 to absorb part of the dimension of the elastic component 3 along the axial direction X. In this way, the dimension of the pressure regulating device along the axial direction X can be further reduced, and the structural compactness of the pressure regulating device can be improved.

[0092] like Figure 4 As shown, in some embodiments, the second accommodating chamber 22 includes a first sub-chamber 221 and a second sub-chamber 222 that are connected to each other, and the second sub-chamber 222 is arranged on a side of the first sub-chamber 221 away from the oil inlet hole 12; the maximum inner diameter of the first sub-chamber 221 is smaller than the minimum inner diameter of the second sub-chamber 222.

[0093] In the embodiment of the present application, by configuring the second accommodating chamber 22 to be a combination of a first sub-chamber 221 and a second sub-chamber 222, and controlling the maximum inner diameter of the first sub-chamber 221 to be smaller than the minimum inner diameter of the second sub-chamber 222, it is possible to further ensure that the pressure regulating device has a compact and stable structure while having a stable pressure regulating capability.

[0094] Specifically, in the pressure regulating device of the embodiment of the present application, when the pressure on the plunger 2 is relatively small, the relative deformation of the elastic component 3 is relatively small. 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 limit and guide the second spring 32 to prevent the second spring 32 from bending, deforming and being damaged. Further, when the pressure on the plunger 2 is relatively large, the compression of the elastic component 3 along the axial direction X increases, and the relative deformation also increases. At this time, the second sub-cavity 222 with a relatively large inner diameter can accommodate the larger deformation of the second spring 32, and guide and limit the second spring 32 accordingly to avoid the spring from bending, deforming and being damaged, thereby ensuring effective pressure regulation of the pressure regulating device.

[0095] Please refer to Figure 1-Figure 2 In some embodiments, the plunger 2 has a pressure balance hole 23, and the pressure balance hole 23 is connected to the second accommodating chamber 22 and the oil drain hole 13 respectively.

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

[0097] Please refer to Figure 3-Figure 4 In some embodiments, the oil drain hole 13 includes a first area 131 and a second area 132 that are connected, and the first area 131 is arranged on a side of the second area 132 close to the oil inlet hole 12; along the circumference of the valve body 1, the size of the first area 131 is smaller than the size of the second area 132.

[0098] In the embodiment of the present application, by setting the oil drain hole 13 into the first area 131 and the second area 132, and the width of the second area 132 is greater than the width of the first area 131, it is possible to use the first area 131 to achieve smooth and effective pressure regulation of the pressure regulating device; using the second area 132, it is possible to open a larger pressure relief area when the pressure in the main oil channel is too high, so that faster pressure relief can be achieved, thereby effectively protecting the main oil channel, which is equivalent to a safety valve. Therefore, the present application sets the oil drain hole 13 formed by the combination of the first area 131 and the second area 132, so that the pressure regulating device can take into account the opening pressure requirements of the pressure regulating valve and the safety valve at the same time, and can realize the integration of the pressure regulating valve and the safety valve, further improve the structural compactness of the lubricating oil system, and reduce the cost of the lubricating oil system.

[0099] Please refer to Figure 2 and Figure 4In some embodiments, the pressure regulating device also includes a plunger seat 6, which is arranged on the side of the oil drain hole 13 close to the oil inlet hole 12 and connected to the valve body 1; at least a part of the plunger seat 6 is arranged on the side of the plunger 2 away from the elastic component 3, and the plunger seat 6 can be sealed and abutted against the plunger 2; the plunger seat 6 has a through hole 61, and the through hole 61 can be connected to the oil inlet hole 12 and the oil drain hole 13.

[0100] In the embodiment of the present application, by setting the plunger seat 6, the plunger 2 can be limited, and through the mutual cooperation between the plunger seat 6 and the plunger 2, the pressure regulating device can be closed when the pressure in the main oil channel is normal, thereby realizing the shutoff between the oil drain hole 13 and the oil inlet hole 12 to avoid the exposure of the lubricating oil.

[0101] It should be noted that in the embodiment of the present application, the plunger seat 6, on the one hand, limits and seals the plunger 2, and on the other hand, when there is a gap between the plunger 2 and the plunger seat 6, the oil inlet hole 12 and the oil drain hole 13 can be connected through the through hole 61 to achieve smooth oil drainage and pressure regulation of the main oil channel.

[0102] like Figure 4 As shown, in some embodiments, the plunger 2 includes a first section 24 and a second section 25, and 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 abuts against the plunger 2, at least a portion 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 the outer diameter of the first section 24, and an oil drain gap 7 is provided between the outer wall of the first section 24 and the inner wall of the valve body 1, and the oil drain gap 7 is connected to the oil drain hole 13.

[0103] In the embodiment of the present application, the plunger 2 is divided into a first section 24 and a second section 25, and the outer diameter of the second section 25 is larger than the outer diameter of the first section 24. At this time, the distance between the second section 25 and the inner wall of the valve body 1 will be smaller than the distance between the first section 24 and the inner wall of the valve body 1. The second section 25 cooperates with the clearance of the inner wall of the valve body 1 to enable the plunger 2 to move in the first accommodating chamber 11. The clearance between the first section 24 and the inner wall of the valve body 1 is the oil leakage clearance 7. When the plunger 2 moves into the first accommodating chamber 11 along the axial direction X, a clearance appears between the plunger 2 and the plunger seat 6. At this time, the clearance can be connected with the oil leakage clearance 7, and the oil leakage clearance 7 is connected with the oil leakage hole 13. In this way, the oil leakage hole 13 can have a large oil leakage area when the range of the main oil channel pressure increase is small, so as to achieve smooth oil leakage and pressure regulation of the main oil channel.

[0104] It should be noted that, by setting the outer diameter of the first section 24 to be smaller than the outer diameter of the second section 25, the distance between the first section 24 and the inner 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 wall of the valve body 1. At this time, the possibility of the plunger 2 getting stuck in the first accommodating chamber 11 during movement can be reduced.

[0105] It should also be noted that, in the embodiment of the present application, at least part of the oil drain hole 13 is arranged relative to the first section 24. In this case, only the first area 131 can be arranged relative to the first section 24, and the second area 132 can be arranged relative to the second section 25. Alternatively, both the first area 131 and the second area 132 can be arranged relative to the first section 24. The lengths 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 only arranged relative to the first section 24, the oil drain gap 7 is connected to the entire oil drain hole 13, which is more conducive to the rapid leakage of lubricating oil in the initial stage; at the same time, in this case, the length of the second section 25 will be compressed, and the possibility of obstruction when the second section 25 cooperates with the valve body 1 for guidance is further reduced.

[0106] like Fig. 9 As shown, in some embodiments, a first transition surface 26 is provided on the side of the plunger 2 close to the plunger seat 6, and a second transition surface 62 is provided on the side of the plunger seat 6 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 a through hole 61, and part of the plunger 2 is passed through the through hole 61.

[0107] In the embodiment of the present application, by setting 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 achieved, and the sealing area is relatively large. At the same time, part of the plunger 2 is penetrated into 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 embodiment of the present application, when the plunger 2 abuts against the plunger seat 6, 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 thrust of the second spring 32 on the plunger 2 is greater than the pulling force of the first spring 31 on the plunger 2, so the elastic component 3 as a whole can have a pre-tightening force on the plunger 2, so that the plunger 2 can be sealed against the plunger seat 6. At the same time, the force of the elastic component 3 on the plunger 2 is relatively small at this time, so that a rapid response pressure regulation can be achieved when the pressure in the main oil channel increases.

[0110] Please refer to Figure 1-Figure 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 embodiment of the present application, by providing a plurality of oil drain holes 13, it is possible to achieve simultaneous oil drain and pressure reduction in multiple directions, thereby improving the pressure regulating capacity of the pressure regulating device.

[0112] Accordingly, a diesel engine according to an embodiment of the present application includes a lubricating oil system and a pressure regulating device as described in any one of the aforementioned embodiments, wherein the pressure regulating device is arranged in the lubricating oil system to regulate the pressure in the lubricating oil system.

[0113] It can be understood that the diesel engine of the embodiment of the present application includes all the technical features and technical effects of the pressure regulating device of the aforementioned embodiment, which will not be repeated here.

[0114] By providing the pressure regulating device of the embodiment of the present application, the diesel engine can achieve rapid pressure regulation of the diesel engine lubricating oil system, and has a larger pressure regulation range, while making the structure of the lubricating oil system more compact.

[0115] The pressure regulating device in the embodiment of the present application can be divided into working states of the pressure regulating device according to the stroke X of the plunger 2 when performing pressure regulating work. For details, please refer to Fig.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; when the pressure regulating device is fully open, the moving position of the plunger 2 is X=X2. It is divided into the following four stages:

[0116] 1) When X=X0, the main oil channel pressure P is less than the opening pressure P0 of the pressure regulating device, the corresponding diesel engine is in a medium-low 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 lubricating oil does not leak.

[0117] 2) When X0<X<X1, the opening pressure of the pressure regulating device P0<main oil channel pressure P<rated working pressure of the pressure regulating device P1, corresponding to the diesel engine being in a high speed state. The second spring 32 (rigidity is K1) is in a compressed state, the first spring 31 (rigidity is K2) is in a stretched state, the rigidity of the elastic component 3 is K=K1-K2, and the overall rigidity of the elastic component 3 is relatively small. At this time, the response of the pressure regulating device is relatively fast, which is conducive to stabilizing the main oil channel pressure under high speed state.

[0118] 3) When X=X1, the main oil channel pressure P=rated working pressure P1 of the pressure regulating device, corresponding to the rated speed of the diesel engine. The second spring 32 (rigidity K1) is in a compressed state, and the first spring 31 (rigidity K2) is in a free state. In this state, when the main oil channel pressure fluctuates, the first spring 31 can provide negative feedback regulation to the plunger 2, reducing the axial X displacement of the plunger 2 when the pressure fluctuates. Specifically as follows: a) When the lubricating oil pressure fluctuates to P>P1, the second spring 32 and the first spring 31 are in a compressed state, and the stiffness of the elastic component 3 combined increases, increasing the thrust of the elastic component 3 on the plunger 2, making it difficult for the plunger 2 to move to the inside of the first accommodating chamber 11 of the valve body 1; when the lubricating oil pressure fluctuates to P<P1, the second spring 32 is in a compressed state, the first spring 31 is in a stretched state, the stiffness of the elastic component 3 is reduced, reducing the thrust of the elastic component 3 on the plunger 2, making it difficult for the plunger 2 to move to the oil inlet hole 12 of the valve body 1, thereby achieving stable operation of the plunger 2.

[0119] 4) X1<X≤X2. At this time, the rated working pressure P1 of the pressure regulating device is less than the main oil channel pressure P. The second spring 32 (stiffness K1) and the first spring 31 (stiffness K2) are both in a compressed state, the stiffness K of the elastic component 3 is K1+K2, and the overall stiffness of the elastic component 3 is relatively large. At this time, the pressure regulating device has a relatively large range of pressure regulating capabilities. If when X=X2, the corresponding maximum working pressure P2 of the pressure regulating device is greater than the safety valve opening pressure, then the pressure regulating device can integrate the safety valve function, and the diesel engine does not need to be separately arranged with a safety valve.

[0120] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0121] The above is a detailed introduction to a pressure regulating device and a diesel engine provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A pressure regulating device, characterized in that: include: A valve body (1) having a first accommodating chamber (11), an oil inlet hole (12) and an oil drain hole (13) which are interconnected; A plunger (2) is arranged in the first accommodating chamber (11); the plunger (2) is capable of moving along the axial direction (X) of the valve body (1) to connect or disconnect the oil inlet hole (12) and the oil drain hole (13); The elastic component (3) is arranged in the first accommodating cavity (11) and comprises: A first spring (31) is connected to the valve body (1) and the plunger (2) respectively along the axial direction (X), and the first spring (31) can be stretched or compressed along the axial direction (X); The second spring (32) is arranged around the outer peripheral side of the first spring (31) and abuts against the valve body (1) and the plunger (2) respectively along the axial direction (X); the second spring (32) can be compressed along the axial direction (X).

2. The pressure regulating device according to claim 1, characterized in that: The first spring (31) comprises: Spring body (311); A first connecting portion (312) connected to the spring body (311) and the valve body (1) respectively; The second connecting portion (313) is arranged at one end of the spring body (311) away from the first connecting portion (312), and is respectively connected to the spring body (311) and the plunger (2).

3. The pressure regulating device according to claim 2, characterized in that: The first connecting portion (312) comprises: A first connecting plate (3121) connected to the spring body (311) and the valve body (1) respectively; A first guide rod (3122), connected to a side of the first connecting plate (3121) facing the spring body (311), and the first guide rod (3122) is inserted into the spring body (311); The second connecting portion (313) comprises: A second connecting plate (3131) connected to the spring body (311) and the plunger (2) respectively; The second guide rod (3132) is connected to the side of the second connecting plate (3131) facing the spring body (311), and the second guide rod (3132) is inserted into the spring body (311).

4. The pressure regulating device according to claim 3, characterized in that: The pressure regulating device also includes: A first connecting member (4) connected to the first connecting portion (312) and the valve body (1); A second connecting member (5) is connected to the second connecting portion (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 facing the first connecting plate (3121) along the axial direction (X), 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 along the axial direction (X) facing 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 the first limiting portions (14), and the plurality of the first limiting portions (14) are arranged around the spring body (311); the first connecting plate (3121) is provided with a plurality of the first limiting grooves (31211), and the plurality of the first limiting grooves (31211) are arranged around the first guide rod (3122), and each of the first limiting portions (14) is inserted into one of the first limiting grooves (31211); The plunger (2) is provided with a plurality of second limiting portions (21), and 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), and 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 of the second limiting grooves (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), the plurality of first limiting rings (3123) are all connected to the first connecting plate (3121), and the plurality of first limiting rings (3123) are arranged at intervals on the outer peripheral side of the first guide rod (3122); one end of the spring body (311) connected to the first connecting portion (312) is respectively inserted into the plurality of first limiting rings (3123); The second connecting portion (313) further comprises a plurality of second limiting rings (3133), the plurality of second limiting rings (3133) are all connected to the second connecting plate (3131), and the plurality of second limiting rings (3133) are arranged at intervals on the outer peripheral side of the second guide rod (3132); one end of the spring body (311) connected to the second connecting portion (313) is respectively passed through the plurality of second limiting rings (3133).

8. The pressure regulating device according to claim 3, characterized in that: The first guide rod (3122) and the second guide rod (3132) are coaxial.

9. The pressure regulating device according to claim 3, characterized in that: 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 according to claim 1, characterized in that: Along the radial direction of the valve body (1), the first spring (31) and the second spring (32) are arranged at intervals, and the second spring (32) and the side wall of the valve body (1) are arranged at intervals.

11. The pressure regulating device according to claim 10, characterized in that: The plunger (2) has a second accommodating cavity (22), the second accommodating cavity (22) passes through a side of the plunger (2) away from the oil inlet hole (12), and the second accommodating cavity (22) is communicated 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 to the plunger (2); the second spring (32) is spaced apart from the inner side wall of the plunger (2).

12. The pressure regulating device according to claim 11, characterized in that: The second accommodating chamber (22) comprises a first sub-chamber (221) and a second sub-chamber (222) which are connected to each other; the second sub-chamber (222) is arranged on a side of the first sub-chamber (221) away from the oil inlet hole (12); and the maximum inner diameter of the first sub-chamber (221) is smaller than the minimum inner diameter of the second sub-chamber (222).

13. The pressure regulating device according to claim 11, characterized in that: The plunger (2) has a pressure balance hole (23), and the pressure balance hole (23) is respectively connected to the second accommodating chamber (22) and the oil drain hole (13).

14. The pressure regulating device according to claim 1, characterized in that: The oil drain hole (13) comprises a first area (131) and a second area (132) which are connected to each other. The first area (131) is arranged on a side of the second area (132) close to the oil inlet hole (12). Along the circumference of the valve body (1), the size of the first area (131) is smaller than the size of the second area (132).

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

16. The pressure regulating device according to claim 15, characterized in that: The plunger (2) comprises a first section (24) and a second section (25), wherein 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 portion 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 the outer diameter of the first section (24), an oil drain gap (7) is provided between the outer side wall of the first section (24) and the inner side wall of the valve body (1), and the oil drain gap (7) is connected to the oil drain hole (13).

17. The pressure regulating device according to claim 15, characterized in that: A first transition surface (26) is provided on a side of the plunger (2) close to the plunger seat (6), and a second transition surface (62) is provided on a side of the plunger seat (6) facing the plunger (2); the first transition surface (26) is capable of sealingly fitting with the second transition surface (62); the second transition surface (62) is used to enclose the through hole (61), and a portion of the plunger (2) is passed through the through hole (61).

18. The pressure regulating device according to claim 15, characterized in that: 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 according to claim 1, characterized in that: 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).

20. A diesel engine, characterized in that: It comprises a lubricating oil system and a pressure regulating device as described in any one of claims 1 to 19, wherein the pressure regulating device is arranged in the lubricating oil system and is used to regulate the pressure in the lubricating oil system.

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