Flow collecting valve, load-sensitive hydraulic system and vehicle

Abstract

The utility model provides a flow collecting valve, a load-sensitive hydraulic system and a vehicle. According to the flow collecting valve, a pilot oil cavity is used for introducing pilot oil shunted by a first oil pump, a load oil cavity is used for introducing load sensitive oil for feeding back load pressure, and an elastic piece is arranged in the load oil cavity; the regulation and control oil cavity is used for introducing oil supplied by the second oil pump and is communicated with the oil return passage and the confluence passage respectively; the confluence path is blocked by a one-way valve core; the main body section of the flow collecting valve element is located in the regulation and control oil cavity, the first end is located in the pilot oil cavity, and the second end is located in the load oil cavity and abuts against the elastic piece so that the flow collecting valve element can move under the thrust action of pilot oil, load sensitive oil and the elastic piece to block or open the oil return channel. The confluence valve is simple in structure, oil supply can be adjusted along with load change according to working conditions, oil loss is reduced, oil quantity regulation and control are achieved through a simple valve set structure, and later maintenance can be facilitated on the basis that the oil quantity regulation and control requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generators, in particular to a confluence valve, a load-sensitive hydraulic system and a vehicle. BACKGROUND

[0002] In the load-sensitive hydraulic system (hereinafter referred to as the hydraulic system), a double pump is commonly used for oil supply, and a valve group is used for regulating and controlling two oil flows. However, in order to meet the oil flow regulation functions such as confluence and overflow, to better adapt to the load demand under different working conditions, and to reduce energy loss, the hydraulic system uses a valve group with complex structure and complicated composition, and usually uses multiple valve cores to jointly regulate and control the confluence of two oil flows, resulting in a complicated hydraulic pipeline composition, which is not conducive to cost reduction and post-maintenance. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a confluence valve with a simplified structure, which can adjust the oil supply according to the load change under different working conditions, reduce oil loss, and achieve oil flow regulation through a simplified valve group structure, so as to facilitate post-maintenance while meeting the oil flow regulation requirements. In addition, the present application also provides a load-sensitive hydraulic system comprising the above-mentioned confluence valve, and a vehicle comprising the above-mentioned load-sensitive hydraulic system.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] A confluence valve suitable for a load-sensitive hydraulic system, comprising a valve body, wherein a pilot oil cavity, a regulation oil cavity, a load oil cavity, a confluence valve core, a one-way valve core, a return oil passage and a confluence passage are arranged on the valve body.

[0006] The pilot oil cavity is used for introducing the pilot oil divided out when the first oil pump supplies oil to the working oil passage, the load oil cavity is used for connecting with the load-sensitive pump in the hydraulic system to introduce the load-sensitive oil for feedback load pressure, and an elastic member is arranged in the load oil cavity.

[0007] The regulation oil cavity is used for introducing the oil supplied by the second oil pump, and is connected with the return oil passage and the confluence passage respectively; and the confluence passage is blocked by the one-way valve core.

[0008] The main section of the confluence valve core is located in the regulation oil cavity, the first end is located in the pilot oil cavity, and the second end is located in the load oil cavity and abuts against the elastic member, so that the return oil passage can be blocked or opened by the confluence valve core under the thrust of the pilot oil, the load-sensitive oil and the elastic member.

[0009] In a possible implementation, the valve body is further provided with a transfer oil cavity, which is connected to the first oil pump and supplies oil to the pilot oil cavity and the working oil passage respectively.

[0010] The confluence passage is connected to the transfer oil cavity.

[0011] In a possible implementation, the pilot oil cavity, the control oil cavity and the load oil cavity are arranged along the axial direction of the confluence spool in sequence, and the confluence passage and the return passage are distributed on one side or both sides of the confluence spool in the radial direction.

[0012] In a possible implementation, the confluence spool comprises a head section, a narrow-diameter section, a wide-diameter section and a tail section in sequence along the axial direction, and the diameter of the narrow-diameter section is smaller than the diameters of the head section and the wide-diameter section.

[0013] In a possible implementation, the valve body comprises a main valve block and a spring seat, the main valve block is provided with a first recess cavity, and the first recess cavity is provided with a first through hole for the confluence spool to pass into other oil cavities; the spring seat is provided with a second recess cavity, the spring seat is connected to the main valve block by buckling and covers the tail section of the confluence spool, and the first recess cavity and the second recess cavity form the load oil cavity.

[0014] In a possible implementation, the main valve block is provided with a first positioning step surface, and the spring seat is provided with a second positioning step surface that abuts against the first positioning step surface.

[0015] In a possible implementation, the diameter of the tail section of the confluence spool gradually decreases in the direction away from the pilot oil cavity.

[0016] In a possible implementation, the one-way spool comprises a base and a plug spool slidingly arranged on the base, the plug spool is provided with a first abutting step surface, and the confluence passage is provided with a second abutting step surface that abuts against the first abutting step surface.

[0017] The application further provides a load-sensitive hydraulic system comprising a first oil pump, a second oil pump and the confluence valve according to any one of the above.

[0018] The application further provides a vehicle comprising the confluence valve according to any one of the above or comprising the load-sensitive hydraulic system according to the above.

[0019] The combined flow valve provided by the application is directly acted on both ends of the combined flow valve core by the load sensitive oil and the pilot oil provided by the first oil pump according to the oil amount change of the load pressure through the structure of the oil path, so that the combined flow valve core moves according to the load change, and the movement of the combined flow valve core adjusts the opening degree of the oil return port on the second oil pump oil path, so that the oil return port is completely blocked or proportionally opened or completely opened, and whether the oil provided by the second oil pump is combined with the oil provided by the first oil pump and the size of the combined flow are adjusted; thus, the combined flow valve provided by the application realizes the purpose of variable adjustment of the oil supply amount of the hydraulic system according to the load condition with a simplified valve structure; and in addition, the combined flow valve has a simple structure, is beneficial to simplifying the composition of the entire valve group and the composition of the hydraulic system, is beneficial to reducing the cost, and is beneficial to later maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0021] Figure 1 Fig. 1 shows the internal structure schematic diagram of the combined flow valve provided by the embodiment of the present application;

[0022] Figure 2 Fig. 2 shows the first state schematic diagram of the combined flow valve core provided by the embodiment of the present application;

[0023] Figure 3 Fig. 3 shows the second state schematic diagram of the combined flow valve core provided by the embodiment of the present application;

[0024] Figure 4 Fig. 4 shows the oil path connection schematic diagram of the combined flow valve provided by the embodiment of the present application.

[0025] Figures 1-4 In the figure:

[0026] 1, valve body; 2, regulation and control oil cavity; 3, transfer oil cavity; 4, pilot oil cavity; 5, combined flow valve core; 6, one-way valve core; 7, oil return passage; 701, oil return port; 8, combined flow passage; 9, load oil cavity; 10, spring seat; 11, elastic member. DETAILED DESCRIPTION

[0027] The combined flow valve provided by the embodiment of the present application has a simplified structure and can realize the purpose of variable regulation of the oil supply amount according to the load change to reduce the oil consumption, so as to meet the demand of regulating the oil amount in the hydraulic system while simplifying the composition structure of the valve and simplifying the complexity of the hydraulic system, thereby being beneficial to reducing the cost and facilitating later maintenance.

[0028] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0029] In a load-sensitive hydraulic system (hereinafter referred to as a hydraulic system), a double pump is commonly used to supply oil and a valve group is used to regulate the two oil flows. For example, the hydraulic system uses a double fixed displacement pump or a variable displacement pump and a fixed displacement pump to provide two oil flows. In a small load condition, the valve group is used to reduce the oil supply to the hydraulic cylinder to avoid unnecessary oil consumption. In a large load condition, the valve group is used to increase the oil supply to the hydraulic cylinder to meet the working requirements. In order to better adapt to the load requirements in different conditions and reduce energy loss, the hydraulic system uses a valve group with complex structure and complicated composition, and usually uses multiple valve cores to jointly regulate the merging of the two oil flows. For example, in a small load condition, one oil flow is cut off or the amount of one oil flow is reduced, and in a large load condition, the two oil flows are merged or the amount of the two oil flows is increased, resulting in a complicated hydraulic pipeline composition, which is not conducive to cost reduction and post-maintenance.

[0030] Therefore, the present application provides a merging valve to at least partially solve the above problems. The merging valve has a simple structure and can regulate the oil supply according to the load change, reduce oil consumption and unnecessary oil loss, and simplify the composition of the valve to meet the oil regulation requirements in the hydraulic system, thereby reducing the complexity of the hydraulic system, reducing costs and facilitating post-maintenance.

[0031] Please refer to the accompanying drawings Figures 1-4 The merging valve provided by the embodiments of the present application can conduct the single pump oil path when the load of the hydraulic system is small, and can conduct the paths of the two oil pumps when the load is large, so that the two oil flows are merged. The merging valve includes a valve body 1, a merging valve core 5 and a one-way valve core 6 provided on the valve body 1, and a plurality of oil paths including a regulating oil chamber 2, a merging path 8, a return oil path 7, a pilot oil chamber 4 and a load oil chamber 9.

[0032] The pilot oil cavity 4 is connected with the first oil pump through a pipeline, and is used to divert the oil when the first oil pump supplies oil to the working oil circuit (the oil circuit connected with the hydraulic cylinder). The oil flowing into the pilot oil cavity 4 is called pilot oil, that is, when the first oil pump supplies oil to the working oil circuit, part of the oil is diverted as pilot oil into the pilot oil cavity 4. The load oil cavity 9 is connected with the load sensing pump in the hydraulic system to introduce the load sensing oil for feedback of the load pressure. In the hydraulic system (the hydraulic system with load feedback is called load sensing hydraulic system, and is simply referred to as hydraulic system), a feedback port (LS port) for detecting and feeding back the load pressure is arranged on the valve group such as a multi-way valve. The feedback port is connected to the pressure port of the load sensing pump, and the load sensing pump adjusts the output displacement according to the pressure of the feedback port (the oil supplied by the load sensing pump is called load sensing oil). That is, the load sensing oil is adjusted according to the load to output. Therefore, the amount of the load sensing oil changes in direct proportion to the load of the hydraulic system to provide positive feedback. In the present application, the load oil cavity 9 of the merging valve is connected with the load sensing pump to introduce the load sensing oil. In actual use, the load sensing oil flowing into the load oil cavity 9 feeds back the load change and adjusts the oil amount according to the load pressure, that is, when the load is small, the amount of the load sensing oil in the load oil cavity 9 is small, and when the load is large, the amount of the load sensing oil in the load oil cavity 9 is large.

[0033] Meanwhile, the elastic member 11 for pushing the merging valve spool 5 is arranged in the load oil cavity 9. Specifically, the elastic member 11 can be a spring.

[0034] The regulating oil cavity 2 is connected with the second oil pump to introduce the oil supplied by the second oil pump, and is provided with a return port 701 and a merging port. The return port 701 is connected with the return passage 7, and the merging port is connected with the merging passage 8. In other words, the regulating oil cavity 2 is connected with the return passage 7 and the merging passage 8 respectively. The passage port connected with the regulating oil cavity 2 is called the return port 701, and the passage port connected with the regulating oil cavity 2 is called the merging port. The return passage 7 is connected with the oil tank to overflow and return oil. Meanwhile, the merging passage 8 is blocked by the one-way valve spool 6, and the other end is connected with the working oil circuit, that is, the merging passage 8 is connected with the regulating oil cavity 2 and the working oil circuit, and is blocked by the one-way valve spool 6. Therefore, the oil supplied by the second oil pump flows into the regulating oil cavity 2, or flows into the return passage 7 to overflow into the oil tank, or pushes away the one-way valve spool 6 to flow into the working oil circuit to merge with the oil supplied by the first oil pump, and then flows into the hydraulic cylinder to meet the large load demand. In the present application, the flow direction of the oil supplied by the second oil pump is regulated by the merging valve spool 5.

[0035] In the present application, the main section of the combined valve core 5 is in the control oil chamber 2 and is used to block the oil return port 701; the first end of the combined valve core 5 is located in the pilot oil chamber 4 and bears the thrust (or pressure) of the pilot oil provided by the first oil pump, and the second end is located in the load-sensitive oil chamber 9 and is used to bear the thrust of the load-sensitive oil and the elastic element 11; the two ends of the combined valve core 5 can move to block or open the oil return port 701 under the thrust of the pilot oil and the thrust of the load-sensitive oil and the elastic element 11. In this way, the combined valve core 5 can change position under the feedback force of the oil supplied by the first oil pump and the feedback force of the load-sensitive oil, can open or block the oil return port 701, for example, can have a first position of opening the oil return port 701 and a second position of blocking the oil return port 701.

[0036] Specifically, the first oil pump can be a variable pump, which automatically adjusts the displacement according to the load feedback to save oil consumption. When the load is small, for example, a loader provided with a hydraulic system only moves the working arm, the load is small, and the required oil amount is small, so the amount of load-sensitive oil is small at this time. At the same time, in the combined valve, the pressure provided by the pilot oil provided by the first oil pump is greater than the pressure provided by the load-sensitive oil, and the pressure difference between the pilot oil and the load-sensitive oil is greater than the thrust of the elastic element 11, that is, the force applied to the first end of the combined valve core 5 is greater than the force applied to the second end of the combined valve core 5, and the combined valve core 5 is in the first position, as shown in Figure 2 the oil return port 701 and the oil return passage 7 are in a conductive state of communication with the control oil chamber 2, and the oil supplied by the second oil pump flows into the control oil chamber 2 and then flows into the oil return passage 7 and then flows back to the oil tank; and the oil pressure in the control oil chamber 2 is small and cannot push away the one-way valve core 6. In this way, when the load is small, the hydraulic system can be supplied with oil only by the first oil pump, and the oil supplied by the second oil pump is overflowed back to the oil tank, avoiding unnecessary loss.

[0037] When the load becomes large, for example, the loader not only moves the working arm but also performs the lifting operation of the loading bucket, in the combined valve, the amount of load-sensitive oil becomes large, and the force applied to the second end of the combined valve core 5 by the load-sensitive oil and the elastic element 11 is greater than the force applied to the first end of the combined valve core 5 by the pilot oil, and the combined valve core 5 moves to the second position, as shown in Figure 3 the oil return port 701 and the oil return passage 7 are blocked, and when the pressure of the oil supplied by the second oil pump into the control oil chamber 2 is greater than the self-thrust of the one-way valve core 6, the one-way valve core 6 is pushed away, the combined passage 8 is conducted, and the oil flows into the working oil circuit and merges with the oil supplied by the first oil pump to flow into the hydraulic cylinder.

[0038] Meanwhile, since the confluence spool 5 is opened or the return oil passage 7 is opened according to the pressure difference between the two ends, and the pressure difference between the two ends changes according to the load change, the confluence spool 5 can adjust the position in time according to the load change, and the oil supply amount is adjusted in time, not only the position of completely blocking the return port 701 and completely opening the return port 701, but also the position of making the return port 701 have different openings, such as half blocking and half opening the return port 701, small proportion opening the return port 701, etc.; in the multiple states of different openings of the return port 701, the oil supplied by the second oil pump is partially overflowed to the oil tank through the return port 701, but since the return port 701 is not completely opened, the pressure in the oil chamber 2 gradually increases until the one-way valve core 6 is opened, and part of the oil flows to the working oil circuit through the confluence passage 8. It can be seen that the confluence valve provided by the present application can directly act on the confluence spool 5 according to the load pressure feedback, so as to variably adjust the opening of the return port 701 of the second oil pump, variably adjust the oil amount of the second oil pump confluence to the working oil circuit, make the energy utilization of the system more reasonable, and the working efficiency is higher, and meet the oil demand of different working conditions of the equipment.

[0039] Figure 4 As shown is the oil circuit connection schematic diagram of the confluence valve in the hydraulic system, P point is connected with the working oil circuit, PV indicates connection with the first oil pump, Pf indicates connection with the second oil pump, T represents the return port 701, connection with the oil tank, LS indicates feedback connection, and N1 and N2 represent the connection of the oil chambers (the pilot oil chamber 4 and the load oil chamber 9) at both ends of the confluence spool 5.

[0040] Obviously, the confluence valve provided by the present application directly acts on the two ends of the confluence spool 5 through the structure of the oil circuit, so that the confluence spool 5 moves according to the load change, and the movement of the confluence spool 5 adjusts the opening of the return port 701 on the second oil pump oil circuit, completely blocks or proportionally opens or completely opens, so as to control whether the oil supplied by the second oil pump is confluenced with the oil supplied by the first oil pump, and the size of the confluence amount, so as to realize the purpose of adjusting the oil supply amount of the hydraulic system according to the load condition to reduce oil loss with a simplified structure; and in addition, the confluence valve has simple structure, which is beneficial to simplify the composition of the entire valve group and the composition of the hydraulic system, reduce the cost, and facilitate the maintenance in the later period.

[0041] Since the confluence valve core 5 adjusts the opening of the second oil pump return port 701 to timely and variably regulate the oil supply, it is very suitable for a hydraulic system with a variable pump and a fixed pump: for example, the variable pump always supplies oil as the first oil pump and automatically adjusts the displacement according to the load to avoid oil loss; when the load is small, the displacement of the variable pump can meet the working condition demand, the confluence valve core 5 is in the first position, and the oil of the fixed pump as the second oil pump flows back to the tank directly through the action of the confluence valve to avoid oil loss; when the load demand is large and the displacement of the variable pump cannot meet the working condition demand, the confluence valve core 5 is in the second position, and the confluence valve makes the oil of the fixed pump and the variable pump flow together into the hydraulic cylinder for work oil supply. In other words, the confluence valve provided by the application can simply and accurately regulate the oil supply according to the load change, has better performance when applied in a hydraulic system with a variable pump and a fixed pump, can effectively reduce oil loss, and improve the energy efficiency of the hydraulic system.

[0042] As shown in Figure 1 In some embodiments, the valve body 1 is further provided with a transfer oil chamber 3; the transfer oil chamber 3 is in communication with the pilot oil chamber 4 and is provided with an oil supply port connected with the working oil circuit, the transfer oil chamber 3 is used to be connected with the first oil pump to supply oil to the pilot oil chamber 4 and the working oil circuit respectively; and the confluence passage 8 is in communication with the transfer oil chamber 3. In this way, the transfer oil chamber 3 connected with the first oil pump on the valve body 1 can more stably supply the pilot oil to the pilot oil chamber 4, and when the confluence passage 8 is opened, it is also convenient for the oil supplied by the second oil pump to mix with the oil supplied by the first oil pump.

[0043] Specifically, the valve body 1 is provided with a regulation oil chamber 2, a transfer oil chamber 3, a pilot oil chamber 4, a load oil chamber 9, a return passage 7, a confluence passage 8, and a confluence valve core 5; the regulation oil chamber 2 is used to connect the first oil pump and is in communication with the pilot oil chamber 4 and the working oil circuit respectively to supply oil to the pilot oil chamber 4 and the working oil circuit respectively; the transfer oil chamber 3 is used to connect the second oil pump and is in communication with the return passage 7 and the confluence passage 8 respectively, the confluence passage 8 is provided with a one-way valve core 6 and the other end is in communication with the transfer oil chamber 3; the confluence valve core 5 penetrates through the transfer oil chamber 3 and one end is arranged in the load oil chamber 9 and the other end is arranged in the pilot oil chamber 4; the load oil chamber 9 is provided with an elastic member 11 for pushing the confluence valve core 5 to move under the oil pressure of the pilot oil chamber 4 and the load oil chamber 9 and the pushing force of the elastic member 11, and to block or open the return port 701 of the return passage 7 connected with the transfer oil chamber 3.

[0044] The pilot oil chamber 4, the control oil chamber 2 and the load oil chamber 9 are arranged in sequence along the axial direction of the confluence spool 5, and the confluence passage 8 and the return oil passage 7 are distributed on one side or both sides of the control oil chamber 2 in the radial direction of the confluence spool 5. Preferably, the confluence passage 8 and the return oil passage 7 are distributed on both sides of the confluence spool 5, i.e. on both sides of the control oil chamber 2, so as to facilitate the arrangement of the two passages and the communication between the confluence passage 8 and the intermediate oil chamber 3.

[0045] The confluence spool 5 includes a head section, a narrow-diameter section, a large-diameter section and a tail section in sequence along the axial direction. The diameter of the narrow-diameter section is smaller than that of the head section and the large-diameter section. The head section at least has a part located in the pilot oil chamber 4 to bear the thrust of the pilot oil. The tail section at least has a part located in the load oil chamber 9 to bear the thrust of the load-sensitive oil and the elastic member 11. As shown in the drawings, the narrow-diameter section not only facilitates the direct opening of the return oil port 701 when the confluence spool 5 moves, but also provides more space for the control oil chamber 2, avoiding unnecessary occupation of more space in the chamber by the spool and facilitating the flow of oil. Figure 1

[0046] For easy installation, the confluence spool 5 can be axially inserted into each oil chamber, and the valve body 1 is provided with an opening on the pilot oil chamber 4 or the load oil chamber 9 for the confluence spool 5 to enter, and the opening is sealed by other components such as a valve cover after the confluence spool 5 is installed. In this way, the confluence spool 5 can be of an integrated structure without the need for multiple sections, facilitating processing and achieving a sliding sealing connection between the confluence spool 5 and the pilot oil chamber 4 and the load oil chamber 9.

[0047] Exemplarily, the valve body 1 includes a main valve block and a spring seat 10. The main valve block is provided with a first recess for the confluence spool 5 to enter. The control oil chamber 2 and the pilot oil chamber 4 are located on one side of the first recess. The chamber opening of the first recess forms the opening. The first recess is provided with a first through hole communicating with the control oil chamber 2. The control oil chamber 2 is provided with a second through hole communicating with the pilot oil chamber 4. The confluence spool 5 enters the first through hole and the second through hole in sequence from the first recess.

[0048] The spring seat 10 is connected to the main valve block by buckling and covers the tail section of the confluence spool 5. The first recess and the second recess form the load oil chamber 9. The connection between the spring seat 10 and the main valve block is preferentially detachable and sealed. This facilitates assembly and later detection and maintenance of components.

[0049] The spring seat 10 provided with the second recess instead of a flat valve cover to cover the main valve block can more stably and conveniently fix the elastic member 11 used to push the confluence spool 5. The provision of the second recess also reduces the depth of the first recess, facilitating the machining of the first recess on the main valve block. During later maintenance, the spring seat 10 can be easily removed, facilitating the inspection and maintenance of the spring seat 10, the confluence spool 5 and the elastic member 11.​

[0050] Specifically, the connection between the spring seat 10 and the main valve block can be a threaded connection. Meanwhile, a positioning butt joint structure can be provided between the spring seat 10 and the main valve block, for example, a first positioning step surface is provided on the main valve block, and the spring seat 10 has a threaded end and is provided with a second positioning step surface that abuts against the first positioning step surface. During installation, the threaded end of the spring seat 10 extends into the first recess and is threadedly connected with the cavity wall of the first recess, and the second positioning step surface directly or indirectly abuts against the first positioning step surface. The provision of the two butt joint positioning step surfaces not only enhances the assembly accuracy, reduces the matching error of the spool and the spring seat 10, and reduces the wear of the spool and the spring seat 10, but also facilitates the provision of a sealing gasket or other sealing element between the two positioning step surfaces to improve the sealing performance.

[0051] The elastic member 11 can be a spring, for example, a spring sleeve that is sleeved on the tail section of the confluence spool 5, one end of the spring sleeve being connected with the confluence spool 5 and the other end abutting against the bottom wall of the second recess. In this way, when the confluence spool 5 moves in the direction of extending into the second recess, i.e., moves from the first position to the second position, the travel limit or end limit is provided by the elastic member 11 and the bottom wall of the second recess, thereby avoiding excessive movement.

[0052] The tail section of the confluence spool 5 gradually decreases in diameter in the direction gradually away from the control oil cavity 2, as shown in Figure 1 In this way, after the spring is sleeved on the tail section, one end of the spring is directly connected with the spring and the other end has a gap with the spring, so that the confluence spool 5 can avoid friction with the spring sleeve during movement.

[0053] The one-way spool 6 includes a base connected to the valve body 1, a sliding slot provided on the base, a spring provided in the sliding slot, and a plug spool slidingly connected in the sliding slot and abutting against the spring. The plug spool blocks the confluence passage 8 under the pushing action of the spring.

[0054] Exemplarily, as shown in Figure 1 The confluence passage 8 can be T-shaped, including a first section connected with the control oil cavity 2 and a second section connecting the first section and the transfer oil cavity 3. The base of the one-way spool 6 is provided on the side of the second section away from the first section and opposite to the first section, and the plug spool is provided in the axial direction of the first section and blocks the passage opening for connecting the first section and the second section.

[0055] To improve the sealing performance and prevent the plug spool from being skewed after long-term movement, in some embodiments, the blocking end of the plug spool is provided with a first butt joint step surface, and a second butt joint step surface that abuts against the first butt joint step surface is correspondingly provided on the confluence passage 8. For example, the plug spool is provided in the axial direction of the first section and blocks the passage opening for connecting the first section and the second section; the end of the plug spool is provided with the first butt joint step surface, and the passage opening of the first section is provided with the second butt joint step surface, as shown inFigure 1 as shown.

[0056] The embodiment of the present application also provides a load-sensitive hydraulic system, comprising a first oil pump, a second oil pump, and the merging valve in any of the above embodiments; and the first oil pump is a variable pump, and the second oil pump is a fixed displacement pump. The embodiment of the present application also provides a vehicle comprising the merging valve or the load-sensitive hydraulic system. Thus, the load-sensitive hydraulic system and the vehicle have the beneficial effects of the above embodiments, which are not described herein again.

[0057] Specifically, the vehicle can be a loader, a road roller, a winch, etc., which are not limited in the embodiment.

[0058] The above describes the basic principles of the present application in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects, etc. cannot be considered as the must-haves of the various embodiments of the present application. In addition, the above specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the present application, which must use the above specific details to realize.

[0059] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any way. Words such as "include", "contain", "have", etc. are open-ended words, which mean "include but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0060] It should also be pointed out that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application.

[0061] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0062] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the forms disclosed herein. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations, which fall within the scope of the application.

Claims

1. A confluence valve, characterized in that, Suitable for load-sensitive hydraulic systems, the confluence valve includes a valve body (1), on which a pilot oil chamber (4), a regulating oil chamber (2), a load oil chamber (9), a confluence valve core (5), a check valve core (6), a return oil passage (7), and a confluence passage (8) are provided; The pilot oil chamber (4) is used to introduce the pilot oil that flows out when the first oil pump supplies oil to the working oil circuit. The load oil chamber (9) is used to connect to the load-sensitive pump in the hydraulic system to introduce the load-sensitive oil that provides feedback load pressure. An elastic element (11) is provided in the load oil chamber (9). The regulating oil chamber (2) is used to introduce oil supplied by the second oil pump, and is connected to the return oil passage (7) and the combined flow passage (8) respectively; the combined flow passage (8) is blocked by the one-way valve core (6); The main body section of the confluence valve core (5) is located in the regulating oil chamber (2), with the first end located in the pilot oil chamber (4) and the second end located in the load oil chamber (9) and abutting against the elastic element (11), so that it can move under the thrust of the pilot oil, the load sensitive oil and the elastic element (11) to block or open the return oil passage (7).

2. The confluence valve according to claim 1, characterized in that, The valve body (1) is also provided with a transfer oil chamber (3), which is used to connect to the first oil pump and supply oil to the pilot oil chamber (4) and the working oil circuit respectively; The combined flow path (8) is connected to the transfer oil chamber (3).

3. The confluence valve according to claim 1, characterized in that, The pilot oil chamber (4), the regulating oil chamber (2) and the load oil chamber (9) are arranged sequentially along the axial direction of the confluence valve core (5), and the confluence flow path (8) and the return oil passage (7) are distributed on one or both sides of the confluence valve core (5) in the radial direction.

4. The confluence valve according to claim 1, characterized in that, The confluence valve core (5) includes, in sequence along the axial direction, a head section, a narrow diameter section, a large diameter section and a tail section, wherein the diameter of the narrow diameter section is smaller than the diameters of the head section and the large diameter section.

5. The confluence valve according to any one of claims 1-4, characterized in that, The valve body (1) includes a main valve block and a spring seat (10). The main valve block is provided with a first cavity, and the first cavity is provided with a first through hole for the confluence valve core (5) to pass into other oil chambers. The spring seat (10) is provided with a second cavity. The spring seat (10) is fastened to the main valve block and covers the tail section of the confluence valve core (5). The first cavity and the second cavity form the load oil chamber (9).

6. The confluence valve according to claim 5, characterized in that, The main valve block is provided with a first positioning step surface, and the spring seat (10) is provided with a second positioning step surface that abuts against the first positioning step surface.

7. The confluence valve according to claim 4, characterized in that, Along the direction away from the pilot oil chamber (4), the diameter of the tail section of the confluence valve core (5) gradually decreases.

8. The confluence valve according to claim 1, characterized in that, The one-way valve core (6) includes a base and a plug core slidably disposed on the base. The plug core is provided with a first mating step surface, and the merging passage (8) is provided with a second mating step surface for abutting against the first mating step surface.

9. A load-sensitive hydraulic system, characterized in that, It includes a first oil pump, a second oil pump, and a confluence valve as described in any one of claims 1-8, wherein the first oil pump is a variable pump and the second oil pump is a fixed displacement pump.

10. A vehicle, characterized in that, Includes the confluence valve as described in any one of claims 1-8 or the load-sensitive hydraulic system as described in claim 9.

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