Pressure regulating valve with double regulation function and diesel engine hydraulic system

Abstract

The application provides a pressure regulating valve with double regulating function and a diesel engine hydraulic system, and relates to the technical field of pressure regulating valve structure. The valve body of the pressure regulating valve is provided with a flow hole and a liquid inlet, and a valve core is slidably arranged in the valve body, so that the flow hole and the liquid inlet are connected or disconnected. The pressure regulating valve further comprises an elastic member, an abutting seat and an end cover. The two ends of the elastic member are respectively abutted against the valve core and the abutting seat, and the end cover is movably connected to the valve body. The movement of the end cover relative to the valve body drives the abutting seat to move close to or away from the valve core, so that the pre-tightening force of the elastic member is adjusted, and the oil pressure required for driving the valve core to move to connect the flow hole and the liquid inlet is adjusted. The flow area of the flow hole is adjustable. During operation, the oil amount entering the bypass cavity of the diesel engine hydraulic system from the flow hole can be changed by adjusting the flow area, the oil pressure is adjusted, the adjusting accuracy is improved, and the pressure regulating demand in the operation process of the hydraulic system is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure regulating valve structure, in particular to a pressure regulating valve with double regulating function and a diesel engine hydraulic system. BACKGROUND

[0002] The pressure regulating valve is a common pressure regulating control device in the diesel engine hydraulic system, which controls the opening and closing of the bypass flow according to the system pressure to realize the stable regulation of the system pressure and flow. In order to meet the reliability and compactness requirements of the diesel engine, the pressure regulating valve is usually selected to have a fast response and a small volume, and is installed in an embedded manner. Under the running state of the diesel engine, the actual flow state of the hydraulic system is complex, and the system pressure after pressure regulation may have a large deviation and fluctuation from the design value. Therefore, the pressure regulating valve usually needs to be manually adjusted according to the actual running condition when it is matched with the engine, so that the system pressure after pressure regulation meets the design requirements. Due to the structure and installation method of the pressure regulating valve, the direct-acting embedded pressure regulating valve cannot be directly manually adjusted in the matching state, and often needs to be disassembled and assembled several times, which is difficult and tedious to operate.

[0003] In the patent CN206802413U, the adjusting nut is manually rotated to drive the adjusting rod to move up and down, the spring pre-tightening force and the opening pressure of the pressure regulating valve are changed, and the oil and gas pressure in the oil depot is adjusted. However, this kind of adjustment has low precision and cannot meet the pressure regulating requirements in the running process of the hydraulic system. SUMMARY

[0004] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0005] The present application aims to provide a pressure regulating valve with double regulating function, which can effectively improve the pressure regulating precision of the hydraulic system and meet the pressure regulating requirements in the running process of the hydraulic system.

[0006] The present application also aims to provide a diesel engine hydraulic system, which can improve the pressure regulating precision of the hydraulic system and meet the pressure regulating requirements in the running process of the hydraulic system.

[0007] The embodiments of the present application can be implemented in the following ways:

[0008] The application discloses a pressure regulating valve with double regulating functions, which comprises a valve core and a valve body, a drain hole and a liquid inlet are arranged on the valve body, the valve core is slidably arranged in the valve body to make the drain hole communicate with or cut off the liquid inlet, the pressure regulating valve further comprises an elastic member, an abutting seat and an end cover, two ends of the elastic member are respectively abutted against the valve core and the abutting seat, the end cover is movably connected to the valve body, and the movement of the end cover relative to the valve body is used to make the abutting seat approach or move away from the valve core to regulate the pre-tightening force of the elastic member, and the flow area of the drain hole is adjustable.

[0009] Optionally, the pressure regulating valve further comprises a regulating baffle and a regulating rod, the regulating baffle is movably arranged between the valve core and the valve body, one end of the regulating rod is fixedly connected to the regulating baffle, the other end of the regulating rod penetrates through the end cover, and the regulating rod is used to drive the regulating baffle to move relative to the valve body to regulate the flow area of the drain hole.

[0010] Optionally, an arc-shaped hole is arranged on the end cover, the regulating rod is arranged in the arc-shaped hole, the regulating baffle is provided with an opening matched with the drain hole, the regulating rod is used to drive the regulating baffle to rotate relative to the valve body to regulate the flow area of the drain hole by changing the relative position of the opening and the drain hole.

[0011] A first scale is further arranged on the end cover and extends along the circumference of the end cover to indicate the size of the flow area of the drain hole.

[0012] Optionally, the regulating baffle is provided with a shielding part, the regulating rod is used to drive the regulating baffle to move along the axial direction of the pressure regulating valve relative to the valve body to change the area of the shielding part shielding the drain hole.

[0013] A second scale is arranged on the regulating rod and is distributed along the axial direction of the regulating rod to indicate the size of the flow area of the drain hole.

[0014] Optionally, the outer circumferential surface of the valve core is sealingly matched with the valve body to regulate the flow area of the drain hole by the sliding movement of the valve core relative to the valve body, and the size of the drain hole in the cross section of the pressure regulating valve is reduced along the movement direction of the valve core to make the drain hole communicate with the liquid inlet.

[0015] Optionally, the pressure regulating valve further comprises a rotating indicating mechanism and a screw rod, one end of the screw rod is fixedly connected to the valve core, the elastic member is sleeved outside the screw rod, the other end of the screw rod is connected to the rotating part of the rotating indicating mechanism, and the screw rod drives the rotating part to rotate along with the axial movement of the valve core to indicate the stroke of the valve core by the rotation angle of the rotating part.

[0016] Optionally, the rotation indicating mechanism further comprises a pointer, the pointer is located on the side of the rotating member away from the screw rod, and the pointer rotates with the rotating member; the pressure regulating valve further comprises a transparent cover plate installed on the end cover, the transparent cover plate is adjustable in the circumferential position relative to the end cover; the transparent cover plate is provided with a stroke indicating scale, and the stroke of the valve core is displayed through the indicating position of the pointer on the stroke indicating scale.

[0017] Optionally, the rotation indicating mechanism further comprises an outer engaging sleeve and a positioning member, the outer engaging sleeve is sleeved on the rotating member, and the outer engaging sleeve is circumferentially engaged with the rotating member, the positioning member is installed on the outer engaging sleeve to limit the axial position of the rotating member relative to the outer engaging sleeve; the pointer is arranged on the end of the outer engaging sleeve away from the screw rod.

[0018] Optionally, an outer periphery of the outer engaging sleeve is provided with a limiting step, the abutting seat is sleeved on the outer engaging sleeve, and the abutting seat is abutted on the limiting step on the side of the pressure regulating valve away from the end cover in the axial direction, and the end of the outer engaging sleeve away from the screw rod in the axial direction of the pressure regulating valve abuts against the end cover to limit the position of the outer engaging sleeve in the axial direction of the pressure regulating valve.

[0019] A diesel engine hydraulic system comprises the pressure regulating valve with double regulating function, and the diesel engine hydraulic system further comprises a main oil passage and a bypass cavity, the oil inlet of the pressure regulating valve is communicated with the main oil passage, and the drain hole of the pressure regulating valve is communicated with the bypass cavity, so that the opening and closing control of the main oil passage and the bypass cavity is realized through the opening and closing of the drain hole and the oil inlet.

[0020] The beneficial effects of the pressure regulating valve with double regulating function and the diesel engine hydraulic system provided by the embodiments of the present application include:

[0021] The embodiment of the present application provides a pressure regulating valve with double regulation function, which comprises a valve core and a valve body. The valve body is provided with a flow hole and a liquid inlet, and the valve core is slidably arranged in the valve body, so as to realize the opening and closing of the flow hole and the liquid inlet. Meanwhile, the pressure regulating valve further comprises an elastic member, an abutting seat and an end cover, the two ends of the elastic member are respectively abutted against the valve core and the abutting seat, and the end cover is movably connected to the valve body. The abutting seat is driven to be close to or away from the valve core by the movement of the end cover relative to the valve body, so that the oil pressure required for driving the valve core to move to make the flow hole and the liquid inlet communicate is realized. Moreover, the flow area of the flow hole is adjustable. Therefore, in the running process, the oil amount entering the bypass cavity of the diesel engine hydraulic system from the flow hole can be changed by adjusting the flow area, and the regulation of the oil pressure is further improved, the regulation accuracy is improved, and the pressure regulating demand in the running process of the hydraulic system is met.

[0022] The embodiment of the present application also provides a diesel engine hydraulic system, which comprises the pressure regulating valve with double regulation function described above, and therefore has the beneficial effects of high regulation accuracy and the ability to meet the pressure regulating demand in the running process. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above features and advantages of the present application can be better understood by reading the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings. In the drawings, various components are not necessarily drawn to scale and components of similar or identical function or features can have the same or similar reference label.

[0024] Figure 1 A structure schematic diagram of a pressure regulating valve with double regulation function is shown according to an aspect of the present application;

[0025] Figure 2 A right view structure schematic diagram of a pressure regulating valve with double regulation function is shown according to an aspect of the present application;

[0026] Figure 3 An exploded structure schematic diagram of a pressure regulating valve with double regulation function is shown according to an aspect of the present application;

[0027] Figure 4 A cross-sectional structure schematic diagram of a pressure regulating valve with double regulation function is shown according to an aspect of the present application;

[0028] Figure 5 A cross-sectional structure schematic diagram of a pressure regulating valve with double regulation function when the pre-tightening force is the maximum is shown according to an aspect of the present application;

[0029] Figure 6 A structure schematic diagram of a pressure regulating valve with double regulation function when the flow hole is partially blocked is shown according to an aspect of the present application;

[0030] Figure 7 a pressure regulating valve in the case of Figure 6 a pressure regulating valve in the case of

[0031] Figure 8 a pressure regulating valve in the case of Figure 6 a pressure regulating valve in the case of

[0032] Figure 9 a pressure regulating valve in the case of

[0033] Figure 10 a pressure regulating valve in the case of

[0034] Figure 11 a pressure regulating valve in the case of

[0035] Reference signs:

[0036] 10 - pressure regulating valve; 110 - valve body; 111 - discharge hole; 112 - inlet; 113 - mounting inlet and outlet; 114 - first sealing groove; 115 - limiting boss; 120 - end cover; 121 - inner ring; 122 - outer ring; 123 - arc-shaped hole; 124 - first scale; 130 - locking nut; 140 - transparent cover plate; 141 - stroke indicating scale; 150 - retaining ring; 151 - circlip; 210 - valve core; 220 - screw rod; 230 - elastic member; 240 - abutting seat; 241 - second sealing groove; 250 - rotating indicating mechanism; 251 - rotating member; 252 - outer engaging sleeve; 253 - limiting step; 254 - positioning member; 255 - pointer cover plate; 256 - pointer; 310 - adjusting baffle; 311 - opening; 312 - threaded hole; 320 - adjusting rod; 330 - locking nut; 411 - first sealing ring; 412 - second sealing ring. DETAILED DESCRIPTION

[0037] The present application will be described in detail below with reference to the drawings and specific embodiments. Note that the aspects described below in conjunction with the drawings and specific embodiments are merely exemplary and should not be understood as limiting the scope of protection of the present application in any way.

[0038] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", "vertical", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is usually placed, and not indicate or imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it should not be understood as limiting the present application.

[0039] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Figure 1 This is a schematic diagram of the structure of the pressure regulating valve 10 with dual regulation function provided in this embodiment. Figure 2 for Figure 1 A schematic diagram of the right-side structure. Figure 3 This is an exploded structural diagram of the pressure regulating valve 10 with dual regulation function provided in this embodiment. Please refer to the attached diagram. Figures 1-3 This embodiment provides a pressure regulating valve 10 (hereinafter referred to as pressure regulating valve 10) with dual adjustment function, and correspondingly, a diesel engine hydraulic system is also provided.

[0042] The diesel engine hydraulic system includes a pressure regulating valve 10. It also has a main oil passage (not shown) and a bypass chamber (not shown). The inlet 112 of the pressure regulating valve 10 is connected to the main oil passage, and the drain hole 111 of the pressure regulating valve 10 is connected to the bypass chamber. When the oil pressure in the main oil passage is sufficient to push the valve core 210 relative to the valve body 110, causing the elastic element 230 to compress, the movement of the valve core 210 connects the inlet 112 and the drain hole 111. At this time, the hydraulic oil in the main oil passage enters the bypass chamber through the pressure regulating valve 10, thus regulating the oil pressure. It is understood that both the main oil passage and the bypass chamber can be located within the diesel engine body, in which case the pressure regulating valve 10 can be installed on the diesel engine body.

[0043] Please refer to the reference again. Figures 1-3In the present embodiment, the pressure regulating valve 10 comprises a valve body 110 and a valve core 210. The valve body 110 is used to realize the installation and sealing of the pressure regulating valve 10, for example, it can be fixed on the diesel engine body by screwing or the like. At the same time, the valve body 110 has a liquid inlet 112 and a leakage hole 111. Specifically, the valve body 110 is a circular tubular structure, which is hollow and has openings 311 at both axial ends, and the valve core 210 is installed in the hollow chamber of the valve body 110. The opening 311 at one axial end of the valve body 110 serves as the liquid inlet 112, and the opening 311 at the other axial end of the valve body 110 serves as a mounting inlet and outlet 113, through which the valve core 210 can enter and exit the valve body 110. The leakage hole 111 is arranged on the circumference of the valve body 110, and the leakage hole 111 is arranged closer to the liquid inlet 112 than the mounting inlet and outlet 113.

[0044] Further, the pressure regulating valve 10 further comprises a check ring 150 installed at the liquid inlet 112 of the valve body 110, which limits the axial position of the valve core 210 by abutting against the end of the valve core 210, and when the valve core 210 abuts against the check ring 150, the passage between the leakage hole 111 and the liquid inlet 112 is blocked by the cooperation of the check ring 150 and the valve core 210, that is, at this time the hydraulic oil at the liquid inlet 112 cannot flow to the leakage hole 111, and the liquid inlet 112 and the leakage hole 111 are in a disconnected state. The check ring 150 is also provided with a circlip 151 for limiting the check ring 150.

[0045] The valve core 210 is a tubular member with one end sealed, the axial sealed end of the valve core 210 is arranged towards the liquid inlet 112, and the axial opening 311 end of the valve core 210 is arranged towards the mounting inlet and outlet 113. The valve core 210 is coaxially arranged with the valve body 110, so in the description of the present embodiment, the "axial direction of the valve core 210", "axial direction of the valve body 110" and "axial direction of the pressure regulating valve 10" can be regarded as the same axial direction, in addition, unless otherwise stated, in the description of the present embodiment, if the radial direction, axial direction and circumferential direction are mentioned, they refer to the radial direction, axial direction and circumferential direction of the pressure regulating valve 10 respectively.

[0046] The pressure regulating valve 10 further comprises an elastic member 230, an abutting seat 240 and an end cover 120, one end of the elastic member 230 is inserted into the hollow chamber of the valve core 210 and abuts against the inner end face of the valve core 210, and the other end abuts against the abutting seat 240, that is, the abutting seat 240 is located outside the axial opening 311 end of the valve core 210. The end cover 120 is installed at the end of the mounting inlet and outlet 113 of the valve body 110, and the end cover 120 is movable relative to the valve body 110 to move the abutting seat 240 closer to or away from the valve core 210, thereby changing the compression amount of the elastic member 230, so as to realize the adjustment of the pre-tightening force of the elastic member 230, and thus change the opening oil pressure of the pressure regulating valve 10. The elastic member 230 includes but is not limited to a spring.

[0047] Specifically, the end cover 120 comprises an end wall and two annular protrusions arranged on one side of the end wall, the two annular protrusions are coaxially arranged and are respectively an outer ring 122 and an inner ring 121, the outer ring 122 is screwed (hereinafter referred to as “screwed”) with the valve body 110, so as to adjust the axial position of the end cover 120 by screwing the end cover 120. The inner ring 121 abuts against the abutting seat 240, so that when the axial position of the end cover 120 changes, the position of the abutting seat 240 changes accordingly, thereby adjusting the compression amount of the elastic member 230.

[0048] Further, the pressure regulating valve 10 further comprises a locking nut 130, which is screwed on the valve body 110 and used to lock the end cover 120, so as to avoid displacement of the end cover 120 relative to the valve body 110 during operation. As shown in Figure 4 , a limiting boss 115 is arranged on the outer periphery of the valve body 110, and the distance L between the locking nut 130 and the limiting boss 115 is the range in which the compression amount of the elastic member 230 can be increased. As shown in Figure 5 , at this time, the locking nut 130 abuts against the limiting boss 115, and the distance L = 0, that is, the pre-tightening force of the elastic member 230 is adjusted to the maximum, at this time, only the end cover 120 can move along the arrow in the middle, and the compression amount of the elastic member 230 is reduced, so that the opening pressure of the pressure regulating valve 10 is reduced. Figure 5

[0049] In the embodiment, the pressure regulating valve 10 further comprises a rotation indicating mechanism 250 and a screw rod 220. One end of the screw rod 220 is fixedly connected with the valve core 210, the elastic member 230 is sleeved on the outer periphery of the screw rod 220, and the other end of the screw rod 220 is connected with a rotating piece 251 of the rotation indicating mechanism 250, so that the rotating piece 251 is rotated by the axial movement of the valve core 210 through the screw rod 220, and thus the stroke of the valve core 210 can be indicated by the rotation angle of the rotating piece 251, so as to realize the visualization of the operation state of the pressure regulating valve 10.

[0050] Specifically, one end of the screw rod 220 is fixedly connected with the inner end face of the valve core 210 by welding, and the other end of the screw rod 220 extends out of the valve core 210 and is connected with the rotating piece 251. The screw rod 220 and the rotating piece 251 form a structure similar to a lead screw mechanism, so that in the working process, the axial linear motion of the valve core 210 is converted into rotation through the cooperation of the rotating piece 251 and the screw rod 220, so that the axial space can be saved, and the installation requirement of the pressure regulating valve 10 in the case of small axial space. In order to ensure the indication effect, the pitch of the screw rod 220 should be designed and calculated to ensure that the rotation angle of the rotating piece 251 is less than or equal to 360° in one movement stroke of the valve core 210. According to the engagement formula of the screw rod 220, the pitch can be matched and designed:

[0051] ① The pitch and lead of the screw rod 220: S = n·P (Formula 1)​

[0052] Where S is the lead of screw 220, n is the number of threads of screw 220, and P is the pitch of screw 220.

[0053] ② Valve core 210 stroke and pitch:

[0054] but

[0055] Where L is the stroke of valve core 210, and θ is the maximum rotation angle of the designed rotating component 251.

[0056] As can be seen from Formula 3, based on the designed valve core 210 stroke and maximum rotation angle, the screw pitch can be reasonably matched by adjusting the number of threads on the screw 220.

[0057] Furthermore, the rotary indicating mechanism 250 also includes a pointer 256, which is located on the side of the rotating member 251 away from the screw 220, and the pointer 256 rotates with the rotating member 251. The pressure regulating valve 10 also includes a transparent cover plate 140 mounted on the end cover 120. The transparent cover plate 140 is provided with a stroke indication scale 141, and the circumferential position of the transparent cover plate 140 relative to the end cover 120 is adjustable to ensure that after tightening the end cover 120 to adjust the preload of the elastic member 230, the stroke indication scale 141 on the transparent cover plate 140 remains as shown. Figure 2 The position is shown. Optionally, in this embodiment, the transparent cover 140 is detachably fastened to the end cover 120, so that the circumferential position of the transparent cover 140 relative to the end cover 120 can be changed by removing and attaching the transparent cover 140.

[0058] During operation, the oil pressure in the main oil passage acts on the bottom surface of the valve core 210 at the end away from the end cover 120, overcoming the preload force of the elastic element 230, thereby pushing the valve core 210 to move axially relative to the valve body 110. At the same time, the pointer 256 rotates accordingly. Therefore, the angle of the pointer 256 can be calculated and converted to the corresponding oil pressure value, and marked on the stroke indication scale 141 for easy reading.

[0059] ① The force F on valve core 210: F=F0+K×L(Formula 4);

[0060] ② Valve core 210 corresponds to oil pressure P A :

[0061] ③ The relationship between oil pressure and pointer angle at 256 degrees:

[0062] Where F0 is the spring preload of the pressure regulating valve 10; K is the spring stiffness; D is the bottom diameter of the valve core 210; and L is the stroke of the valve core 210.

[0063] F0= K * D

[0064] Optionally, the rotation indicating mechanism 250 further comprises an outer engaging sleeve 252 and a positioning member 254, the outer engaging sleeve 252 is sleeved on the rotating member 251 and is in circumferential engagement with the rotating member 251 so as to drive the outer engaging sleeve 252 to rotate with the rotating member 251. The positioning member 254 is installed in the outer engaging sleeve 252 and is used to limit the axial position of the rotating member 251 relative to the outer engaging sleeve 252, so as to ensure that the rotating member 251 does not axially displace relative to the outer engaging sleeve 252 during operation. The pointer 256 is arranged at the end of the outer engaging sleeve 252 away from the screw 220.

[0065] Specifically, the outer engaging sleeve 252 is a tubular member with both ends open, and a protrusion is arranged on the inner wall of one end of the outer engaging sleeve 252 to abut against the end of the rotating member 251 and limit the position of the rotating member 251. The positioning member 254 is installed on the side of the rotating member 251 away from the protrusion, and the axial position of the rotating member 251 is positioned by the cooperation of the protrusion and the positioning member 254. The positioning member 254 is a clamp, and the hollow channel in the outer engaging sleeve 252 provides space for the linear motion of the screw 220. The rotation indicating mechanism 250 further comprises a pointer cover plate 255, which covers the end of the outer engaging sleeve 252 away from the screw 220, so as to close the opening of the outer engaging sleeve 252 at this end. The pointer 256 is an arrow mark arranged on the end face of the pointer cover plate 255, which can be formed by engraving, pasting, etc. It can be understood that in other embodiments, the pointer 256 can also be formed by other means, or the pointer cover plate 255 and the outer engaging sleeve 252 can be arranged as an integral structure, i.e. the outer engaging sleeve 252 is arranged as a structure with one end closed.

[0066] Further, a limiting step 253 is arranged on the outer periphery of the outer engaging sleeve 252. The abutting seat 240 is sleeved on the outer engaging sleeve 252, and the abutting seat 240 abuts against the limiting step 253 on the side of the pressure regulating valve 10 axially away from the end cover 120. Meanwhile, the end of the outer engaging sleeve 252 axially away from the screw 220 passes through the pointer cover plate 255 and abuts against the end cover 120. Since the distance between the end cover 120 and the abutting seat 240 does not change under the elastic force of the elastic member 230, the abutting seat 240 and the end cover 120 can limit the axial position of the outer engaging sleeve 252 in the pressure regulating valve 10.

[0067] Please refer to Figures 1-5In the embodiment, the pressure regulating valve 10 further comprises a regulating baffle 310 and a regulating rod 320. The regulating rod 320 is movably arranged between the valve core 210 and the valve body 110, one end of the regulating rod 320 is fixedly connected with the regulating baffle 310, the other end of the regulating rod 320 penetrates through the end cover 120, and the regulating rod 320 is used to drive the regulating baffle 310 to move relative to the valve body 110, so that the flow area of the discharge hole 111 is regulated by the movement of the regulating baffle 310 relative to the valve body 110.

[0068] Specifically, the regulating baffle 310 is generally tubular, which is located between the valve core 210 and the valve body 110, that is, the regulating baffle 310 is sleeved outside the valve core 210 and located in the hollow chamber of the valve body 110. The end cover 120 is provided with a through hole for the regulating rod 320 to penetrate, so that one end of the regulating rod 320 away from the regulating baffle 310 can extend out of the end cover 120 and be located outside the valve body 110, at this time, the staff can drive the regulating rod 320 to move, so that the regulating baffle 310 moves relative to the valve body 110.

[0069] Optionally, the end cover 120 is provided with an arc-shaped hole 123, and the regulating rod 320 penetrates through the arc-shaped hole 123. The regulating baffle 310 is provided with an opening 311 matched with the discharge hole 111. By rotating the regulating rod 320 relative to the end cover 120, the regulating baffle 310 is driven to rotate relative to the valve body 110, the relative position relationship between the opening 311 and the discharge hole 111 changes, that is, the opening 311 is offset by a certain angle from the discharge hole 111, at this time, the peripheral wall of the regulating baffle 310 blocks at least part of the discharge hole 111, so as to change the flow area of the discharge hole 111. In the description of the embodiment, "matched with the discharge hole 111" means that when the opening 311 and the discharge hole 111 are equal in size in the circumferential direction, the size of the opening 311 in the axial direction is greater than that of the discharge hole 111, and when the opening 311 and the discharge hole 111 are located at the same circumferential position, the discharge hole 111 is not blocked as a whole, that is, the flow area of the discharge hole 111 is the opening area of the discharge hole 111 at this time, when the opening 311 is offset by a certain angle from the discharge hole 111 in the circumferential direction, at least part of the discharge hole 111 is blocked by the regulating baffle 310, at this time, the flow area of the discharge hole 111 is the opening area of the discharge hole 111 minus the blocked area. As shown in Figure 6 、 Figure 7 and Figure 8 shown in Figure 6 、 Figure 7 and Figure 8 shown in the state, part of the discharge hole 111 is blocked by the regulating baffle 310, at this time, the flow width of the discharge hole 111 is d, Figure 9 The thickened part of the first scale 124 in the middle is the rotation angle of the regulating rod 320.

[0070] It should be noted that the movement of the adjusting baffle 310 is not limited here, and it can be understood that other structures can also be used in other embodiments.

[0071] As an example, Figure 9 The structure for adjusting the flow area of the drain hole 111 by adjusting the axial sliding of the adjusting baffle 310 relative to the valve body 110 is shown, and Figure 9 The flow width of the drain hole 111 is M. Specifically, the adjusting baffle 310 has a shielding part at the same position as the drain hole 111 in the circumferential direction of the pressure regulating valve 10. The shape of the through hole for the adjusting rod 320 to slide in the end cover 120 is the same as the cross-sectional shape of the adjusting rod 320, so that the position of the adjusting rod 320 in the circumferential direction of the pressure regulating valve 10 is limited by the through hole, and the adjusting rod 320 can slide in the through hole along its own axial direction. In use, the adjusting baffle 310 can be driven to slide axially relative to the valve body 110 by pushing and pulling the adjusting rod 320, so as to change the shielding area of the shielding part to the drain hole 111, and then adjust the flow area of the drain hole 111. Alternatively, the adjusting baffle 310 can use a circumferentially closed ring end as a shielding part, or as shown in the structure of the adjusting baffle 310, the part between the two adjacent openings 311 can be used as a shielding part. Figure 3

[0072] It should also be noted that in other embodiments, other ways can also be used to adjust the flow area of the drain hole 111.

[0073] As an example, Figure 10 And Figure 11 The structure for adjusting the flow area of the drain hole 111 by adjusting the axial sliding of the adjusting baffle 310 relative to the valve body 110 is shown, and Figure 10 As shown, the drain hole 111 is set to have a similar trapezoidal shape with the size of the opening 311 near the liquid inlet 112 larger than the size of the opening 311 near the installation inlet and outlet 113, that is, the size of the drain hole 111 in the cross section of the pressure regulating valve 10 gradually decreases. At the same time, the outer circumferential surface of the valve core 210 is in sealing cooperation with the inner circumferential surface of the valve body 110, so that in the case that the end of the valve core 210 is located between the positions of the two ends of the drain hole 111 along the axial direction of the valve body 110, part of the drain hole 111 is shielded by the valve core 210, so that the movement of the valve core 210 caused by the change of oil pressure realizes the adjustment of the flow area of the drain hole 111. As shown, Figure 11 The drain hole 111 is formed by a plurality of independent small holes, and the distribution of the small holes is relatively dense at the end of the valve body 110 near the liquid inlet 112, and along the direction from the valve body 110 near the liquid inlet 112 to the valve body 110 near the installation inlet and outlet 113 (i.e. the axial direction of the valve body 110), the distribution of the small holes gradually decreases. As shown, Figure 10 ​As the distribution density of the small holes decreases (in the left-right direction), the size of the vent hole 111 on the cross-section of the pressure regulating valve 10 tends to decrease. During the movement of the valve core 210 away from the inlet 112 under oil pressure, the flow area of ​​the vent hole 111 increases, and the rate of increase decreases. Optionally, a sealing ring can be provided on the outer circumferential surface of the valve core 210 near the inlet 112 to achieve a sealing fit between the outer circumferential surface of the valve core 210 and the valve body 110. This structure, which adjusts the flow area of ​​the vent hole 111 through the relative sliding of the valve core 210 and the valve body 110, is simple and suitable for applications with relatively low pressure regulation accuracy requirements.

[0074] In the description of this embodiment, "the cross section of the pressure regulating valve 10" refers to the surface intercepted by a plane perpendicular to the axis of the pressure regulating valve 10.

[0075] Please refer to the reference again. Figures 1-7 In this embodiment, a first scale 124 extending circumferentially along the end cap 120 is provided on the end cap 120. Thus, by adjusting the position of the adjusting rod 320 on the first scale 124, the flow area of ​​the drain hole 111 can be determined. Correspondingly, in such... Figure 8 In the structure shown, the flow area of ​​the drain hole 111 is adjusted by pushing and pulling the adjusting rod 320. Correspondingly, a second scale extending along the axial direction of the adjusting rod 320 can be provided on the adjusting rod 320. The flow area of ​​the drain hole 111 is determined by the position of the end cap 120 on the second scale. This achieves the purpose of making the flow area of ​​the drain hole 111 visible.

[0076] Furthermore, the adjusting rod 320 is detachably connected to the adjusting baffle 310. This allows the adjusting rod 320 to be pre-removed when adjusting the preload of the elastic element 230 by rotating the end cover 120 relative to the valve body 110, thus avoiding any impact on the rotation of the end cover 120. The adjusting rod 320 can then be reinstalled after the preload is adjusted. Optionally, the adjusting rod 320 is screwed to the adjusting baffle 310, and the end of the adjusting baffle 310 is provided with a threaded hole 312.

[0077] Furthermore, the end of the adjusting baffle 310 is provided with multiple threaded holes 312 distributed circumferentially along the adjusting baffle 310. After the preload adjustment is completed, a suitable threaded hole 312 can be selected to install the adjusting rod 320. Furthermore, the central angle corresponding to the arc-shaped hole 123 is designed according to the angle α required for adjusting the flow area of ​​the drain hole 111 by the adjusted baffle 310. Specifically, the central angle corresponding to the arc-shaped hole 123 should be greater than or equal to twice the angle α.

[0078] Further, the adjusting rod 320 is further provided with a locking nut 330, which is screwed on the adjusting rod 320 and located outside the end cover 120, so as to avoid the sliding of the adjusting rod 320 relative to the end cover 120 during operation.

[0079] In the embodiment, the pressure regulating valve 10 further comprises a first sealing ring, which is arranged between the adjusting baffle 310 and the valve body 110, so as to seal the gap between the adjusting baffle 310 and the valve body 110. Correspondingly, the valve body 110 is provided with a first sealing groove 114 for mounting the first sealing ring. The pressure regulating valve 10 further comprises a second sealing ring, which is arranged between the adjusting baffle 310 and the abutting seat 240, so as to seal the gap between the adjusting baffle 310 and the abutting seat. Correspondingly, the abutting seat 240 is provided with a second sealing groove 241 for mounting the second sealing ring.

[0080] The embodiment of the present application provides a pressure regulating valve 10 with double regulation function and a diesel engine hydraulic system. After installation of the pressure regulating valve 10 with double regulation function, when the system pressure is stable and the value is lower than the design pressure during operation of the diesel engine, the pre-compression amount of the elastic member 230 is first increased by rotating the end cover 120, so as to increase the opening pressure of the pressure regulating valve 10, so as to realize coarse regulation of the pressure. After regulation, the end cover 120 is locked by the locking nut 130. Moreover, before rotating the end cover 120, the position of the adjusting rod 320 is recorded, and the adjusting rod 320 and the transparent cover plate 140 are removed, and then the end cover 120 is rotated according to the pressure. After coarse regulation, the adjusting rod 320 and the transparent cover plate 140 are installed to the original position. Then, according to the regulated oil pressure value, the flow area of the leakage hole 111 is adjusted by operating the adjusting rod 320, so as to realize fine regulation, until the system pressure value reaches the design range. After regulation, the current flow area regulation ratio can be confirmed according to the angle between the position of the adjusting rod 320 on the first scale 124 and the initial position. At the same time, since the flow area of the leakage hole 111 of the pressure regulating valve 10 with double regulation function can be artificially adjusted according to the demand, when the elastic member 230 fails or is stuck, etc., resulting in abnormal reduction of the diesel engine hydraulic system pressure during operation of the diesel engine, the leakage hole 111 can be completely closed by the adjusting rod 320 manually, so as to ensure the operation safety of the whole machine.

[0081] The above merely provides a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any change or replacement within the technical range disclosed by the present application can be easily thought by any person skilled in the art, which shall be covered within the protection scope of the present application.

Claims

1. A pressure regulating valve with dual adjustment function, the pressure regulating valve comprising a valve core and a valve body, the valve body being provided with a drain hole and a liquid inlet, the valve core being slidably disposed within the valve body to allow the drain hole to communicate with or be disconnected from the liquid inlet, characterized in that, The pressure regulating valve further includes an elastic element, a stop seat, and an end cap. The two ends of the elastic element abut against the valve core and the stop seat, respectively. The end cap is movably connected to the valve body, and the movement of the end cap relative to the valve body is used to move the stop seat closer to or further away from the valve core to adjust the preload of the elastic element. The flow area of ​​the vent hole is adjustable. The pressure regulating valve also includes a rotary indicator mechanism and a screw. One end of the screw is fixedly connected to the valve core, and the elastic element is sleeved on the outside of the screw. The other end of the screw is connected to the rotating part of the rotary indicator mechanism. The screw moves axially with the valve core, causing the rotating part to rotate, so as to indicate the stroke of the valve core by the rotation angle of the rotating part. The rotary indicator mechanism further includes a pointer located on the side of the rotating component away from the screw, and the pointer rotates with the rotating component; the pressure regulating valve further includes a transparent cover plate mounted on the end cover, the circumferential position of the transparent cover plate relative to the end cover is adjustable; the transparent cover plate is provided with a stroke indication scale, so as to display the stroke of the valve core by the indication position of the pointer on the stroke indication scale; The rotation indicator mechanism further includes an outer engagement sleeve and a positioning element. The outer engagement sleeve is fitted onto the rotating element and engages circumferentially with the rotating element. The positioning element is installed on the outer engagement sleeve to limit the axial position of the rotating element relative to the outer engagement sleeve. The pointer is located at the end of the outer engagement sleeve opposite to the screw.

2. The pressure regulating valve with dual regulation function according to claim 1, characterized in that, The pressure regulating valve also includes an adjusting baffle and an adjusting rod. The adjusting baffle is movably disposed between the valve core and the valve body. One end of the adjusting rod is fixedly connected to the adjusting baffle, and the other end of the adjusting rod extends through the end cover. The adjusting rod is used to drive the adjusting baffle to move relative to the valve body to adjust the flow area of ​​the vent hole.

3. The pressure regulating valve with dual regulation function according to claim 2, characterized in that, The end cap is provided with an arc-shaped hole, and the adjusting rod passes through the arc-shaped hole; the adjusting baffle has an opening adapted to the drain hole, and the adjusting rod is used to drive the adjusting baffle to rotate relative to the valve body, so as to adjust the flow area of ​​the drain hole by changing the relative position of the opening and the drain hole; The end cap is also provided with a first scale extending circumferentially along the end cap, so as to indicate the size of the flow area of ​​the drain hole through the first scale.

4. The pressure regulating valve with dual adjustment function according to claim 2, characterized in that, The adjusting baffle has a blocking part, and the adjusting rod is used to drive the adjusting baffle to move relative to the valve body along the axial direction of the pressure regulating valve, so as to change the area of ​​the blocking part blocking the vent hole; The adjusting rod is provided with a second scale distributed along the axial direction of the adjusting rod, so as to indicate the size of the flow area of ​​the drain hole.

5. The pressure regulating valve with dual regulation function according to claim 1, characterized in that, The outer peripheral surface of the valve core is sealed to the valve body so that the flow area of ​​the drain hole can be adjusted by sliding the valve core relative to the valve body; along the direction of movement of the valve core connecting the drain hole to the liquid inlet, the size of the drain hole on the cross-section of the pressure regulating valve decreases.

6. The pressure regulating valve with dual regulation function according to claim 1, characterized in that, The outer periphery of the external engagement sleeve is provided with a limiting step. The abutment is sleeved on the external engagement sleeve, and the abutment abuts against the limiting step on the side away from the end cover along the axial direction of the pressure regulating valve. The end of the external engagement sleeve away from the screw along the axial direction of the pressure regulating valve abuts against the end cover to limit the position of the external engagement sleeve in the axial direction of the pressure regulating valve.

7. A diesel engine hydraulic system, characterized in that, The diesel engine hydraulic system includes a pressure regulating valve with dual adjustment function as described in any one of claims 1-6, and the diesel engine hydraulic system further includes a main oil passage and a bypass cavity. The oil inlet of the pressure regulating valve is connected to the main oil passage, and the drain hole of the pressure regulating valve is connected to the bypass cavity, so as to realize the on / off control of the main oil passage and the bypass cavity by the on / off connection between the drain hole and the oil inlet.

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