Multi-way valve structure and engineering machine

Abstract

The utility model discloses a multiway valve structure and engineering machinery, the main valve body of this multiway valve structure is equipped with input flow channel, first output flow channel, second output flow channel, third output flow channel and pilot flow channel, the priority valve is integrated in the main valve body, the P mouth of priority valve is directly linked with input flow channel, the CF mouth of priority valve is directly linked with first output flow channel, and first output flow channel is used for with the input end communication of steering system, the EF mouth of priority valve is directly linked with second output flow channel, the pilot check valve and switch valve are all integrated in the main valve body, the P mouth of pilot check valve is directly linked with second output flow channel, the T mouth of pilot check valve is directly linked with third output flow channel, the A mouth of pilot check valve is linked with the P mouth of pilot check valve and is directly linked with pilot flow channel, the switch valve can selectively on-off pilot flow channel's inlet and outlet, second output flow channel is also used for with working system communication. The multiway valve structure has less parts, high assembling efficiency and high integration.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to multi-way valve structure and engineering machinery. Background Technology

[0002] Currently, multi-way valves in agricultural machinery hydraulic systems are mainly used to control the flow and pressure of hydraulic oil in order to control multiple actuators (such as steering mechanisms, lifting mechanisms, etc.).

[0003] For multi-way valve structures applied to steering mechanisms, existing technologies typically use pipelines to connect the inlet of the priority valve to the oil tank, and one outlet of the priority valve to the inlet of the steering system via a pipeline, while the other outlet of the priority valve is connected to other working systems and / or valve components via a pipeline. This allows for priority oil supply to the steering system while also ensuring sufficient oil supply to other working systems and / or valve components. However, using pipelines results in a large number of components in the multi-way valve structure, low assembly efficiency, and poor integration. Utility Model Content

[0004] The purpose of this invention is to provide a multi-way valve structure and engineering machinery to solve the aforementioned problems existing in the multi-way valve structure in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The multi-way valve structure includes:

[0007] The main valve body is provided with an input flow channel, a first output flow channel, a second output flow channel, a third output flow channel, and a pilot flow channel;

[0008] A priority valve is integrated into the main valve body; the P port of the priority valve is directly connected to the input flow channel, the CF port of the priority valve is directly connected to the first output flow channel, the first output flow channel is used to connect to the input end of the steering system, and the EF port of the priority valve is directly connected to the second output flow channel.

[0009] Both the pilot check valve and the on / off valve are integrated into the main valve body; the P port of the pilot check valve is directly connected to the second output flow channel, the T port of the pilot check valve is directly connected to the third output flow channel, and the A port of the pilot check valve is connected to the P port of the pilot check valve and is directly connected to the pilot flow channel; the on / off valve can selectively open and close the inlet and outlet of the pilot flow channel; the second output flow channel is also used to connect to the working system; the input flow channel, the pilot flow channel, and the third output flow channel are all used to connect to the oil tank.

[0010] As an alternative to the above-mentioned multi-way valve structure, the priority valve includes:

[0011] The first sub-valve body is sealed and fixed to the main valve body; the first sub-valve body is provided with a first chamber, the first chamber including a first sub-chamber, and a second sub-chamber and a third sub-chamber located on both sides of the first sub-chamber respectively, the first sub-chamber being directly connected to the input flow channel, the second sub-chamber being directly connected to the first output flow channel, and the third sub-chamber being directly connected to the second output flow channel;

[0012] The first valve core assembly includes a first valve core and a first elastic element. The first valve core is slidably disposed in the first chamber along its own axial direction. A first end of the first elastic element abuts against the first valve core, and a second end abuts against the first sub-valve body. An axial force applied to the first valve core enables the first valve core to connect the first sub-chamber and the third sub-chamber, and an elastic force of the first elastic element enables the first valve core to connect the first sub-chamber and the second sub-chamber.

[0013] As an alternative to the above-mentioned multi-way valve structure, the first sub-valve body includes a first valve body body and a first sealing plug. The first valve body body is integrally formed on the main valve body. The first valve body body is also provided with a first process opening communicating with the first chamber. The first sealing plug seals the first process opening.

[0014] As an alternative to the above-mentioned multi-way valve structure, the priority valve further includes a displacement adjusting component and a fastener. The displacement adjusting component is threadedly connected to the first sealing plug and abuts against the second end of the first elastic element or the end of the first valve core away from the first elastic element. The fastener is used to lock the relative position of the displacement adjusting component and the first sealing plug.

[0015] As an alternative to the above-mentioned multi-way valve structure, the pilot-operated check valve includes:

[0016] The second sub-valve body is sealed and fixed to the main valve body; the second sub-valve body is provided with a second chamber, and the second output flow channel, the third output flow channel and the pilot flow channel are all connected to the second chamber;

[0017] The second valve core assembly includes a second valve core and a second elastic element. The second valve core is slidably disposed in the second chamber along its own axial direction. The second valve core has a through hole that extends along the axial direction. The two ends of the through hole are connected to the second output flow channel and the pilot flow channel respectively. The first end of the second elastic element abuts against the second valve core, and the second end abuts against the second sub-valve body. The axial force applied to the second valve core can cause the second valve core to connect the second output flow channel and the third output flow channel, and the elastic force of the second elastic element can disconnect the second output flow channel and the third output flow channel.

[0018] As an alternative to the above-mentioned multi-way valve structure, the second sub-valve body includes a second valve body and a second sealing plug. The second valve body is integrally formed on the main valve body. The second valve body also has a second process opening that communicates with the second chamber. The second sealing plug seals the second process opening.

[0019] As an alternative to the above-mentioned multi-way valve structure, the multi-way valve structure further includes a throttling tube, which is disposed in the third output channel and is used to regulate the flow rate of the third output channel.

[0020] As an alternative to the above-mentioned multi-way valve structure, the outer periphery of the throttling tube is provided with an external thread, and the inner peripheral wall of the third output flow channel is provided with an internal thread, wherein the external thread and the internal thread are thread-matched; and / or, the throttling tube is located upstream of the third output flow channel.

[0021] As an alternative to the above-mentioned multi-way valve structure, the multi-way valve structure also includes an overflow valve, which is integrated into the main valve body, and the P port of the overflow valve is directly connected to the input flow channel.

[0022] Construction machinery, including the aforementioned multi-way valve structure.

[0023] The beneficial effects of this utility model are:

[0024] This utility model provides a multi-way valve structure, which includes a main valve body, a priority valve, a pilot check valve, and a switching valve. The main valve body has an input flow channel, a first output flow channel, a second output flow channel, a third output flow channel, and a pilot flow channel. The priority valve is integrated into the main valve body; the P port of the priority valve is directly connected to the input flow channel, and the CF port of the priority valve is directly connected to the first output flow channel, which is used to connect to the input end of the steering system. The EF port of the priority valve is directly connected to the second output flow channel. The pilot check valve and the switching valve are both integrated into the main valve body. The P port of the pilot check valve is directly connected to the second output flow channel, the T port of the pilot check valve is directly connected to the third output flow channel, and the A port of the pilot check valve is connected to the P port of the pilot check valve and is also directly connected to the pilot flow channel. The switching valve can selectively open and close the inlet and outlet of the pilot flow channel. The second output flow channel is also used to connect to the working system. The input flow channel, the pilot flow channel, and the third output flow channel are all used to connect to the oil tank.

[0025] After hydraulic oil is introduced into the input channel, it flows preferentially from the P port to the CF port of the priority valve. The CF port of the priority valve is directly connected to the first output channel, which is connected to the input end of the steering system, thus enabling priority delivery of hydraulic oil to the steering system. When the steering system no longer requires additional hydraulic oil, the P port of the priority valve connects to the EF port, delivering hydraulic oil to the second output channel.

[0026] During the process of supplying hydraulic oil to the second output channel, the on / off state of the switching valve is adaptively adjusted according to the working requirements of the working system. When the switching valve is in the connected state, the pilot oil in the pilot channel returns to the oil tank, and the P port and T port of the pilot check valve are connected, so that the hydraulic oil is transported back to the oil tank from the third output channel. When the switching valve is in the disconnected state, the oil pressure at the P port and A port of the pilot check valve remains the same, so that the hydraulic oil in the second output channel flows to the working system, thereby enabling the supply of oil to the working system.

[0027] Specifically, by setting an input flow channel, a first output flow channel, a second output flow channel, a third output flow channel, and a pilot flow channel on the main valve body, it eliminates the need for piping compared to existing technologies, effectively reducing the number of components in the multi-way valve structure, improving assembly efficiency, and enhancing the integration of the multi-way valve structure. Secondly, by integrating the priority valve, pilot check valve, and on / off valve into the main valve body, the integration of the multi-way valve structure can be further enhanced.

[0028] Therefore, this multi-way valve structure can prioritize the delivery of hydraulic oil to the steering system, and can also selectively deliver hydraulic oil to the working system according to actual working conditions. Secondly, this multi-way valve structure has fewer parts, higher assembly efficiency, and higher integration.

[0029] This utility model also provides engineering machinery, including the aforementioned multi-way valve structure. By adopting the above-mentioned multi-way valve structure, the structure of the engineering machinery can be effectively simplified, and the assembly efficiency of the engineering machinery can be improved. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the multi-way valve structure provided in a specific embodiment of this utility model;

[0031] Figure 2 This is a partial cross-sectional view of the multi-way valve structure provided in a specific embodiment of this utility model. Figure 1 ;

[0032] Figure 3 This is a partial cross-sectional view of the multi-way valve structure provided in a specific embodiment of this utility model. Figure 2 ;

[0033] Figure 4 This is a partial cross-sectional view of the multi-way valve structure provided in a specific embodiment of this utility model. Figure 3 .

[0034] In the picture:

[0035] 1. Main valve body; 11. Inlet flow channel; 12. First outlet flow channel; 13. Second outlet flow channel; 14. Third outlet flow channel; 15. Pilot flow channel; 17. First sub-chamber; 18. Second sub-chamber; 19. Third sub-chamber; 20. Second chamber;

[0036] 2. Priority valve; 21. First valve core; 22. First elastic element; 23. First sealing plug; 24. Displacement regulating element; 241. Screw; 242. Spring seat; 243. Third sealing ring; 25. Fastener;

[0037] 3. Pilot check valve; 31. Second valve core; 311. Through hole; 32. Second elastic element; 33. Second sealing plug;

[0038] 4. Switch valve;

[0039] 5. Throttling tube;

[0040] 6. Overflow valve. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] This utility model provides a multi-way valve structure, such as Figure 1-4 As shown, the multi-way valve structure includes a main valve body 1, a priority valve 2, a pilot check valve 3, and a switching valve 4. The main valve body 1 has an input flow channel 11, a first output flow channel 12, a second output flow channel 13, a third output flow channel 14, and a pilot flow channel 15. The priority valve 2 is integrated into the main valve body 1. The P port of the priority valve 2 is directly connected to the input flow channel 11, and the CF port of the priority valve 2 is directly connected to the first output flow channel 12, which is used to connect to the input end of the steering system. The EF port of the priority valve 2 is directly connected to the second output flow channel 13. The pilot check valve 3 and the switching valve 4 are both integrated into the main valve body 1. The main valve body 1 is formed; the P port of the pilot check valve 3 is directly connected to the second output channel 13, the T port of the pilot check valve 3 is directly connected to the third output channel 14, the A port of the pilot check valve 3 is connected to the P port of the pilot check valve 3 and is directly connected to the pilot channel 15; the switching valve 4 can selectively open and close the inlet and outlet of the pilot channel 15; the second output channel 13 is also used to connect with the working system; the input channel 11, the pilot channel 15 and the third output channel 14 are all used to connect with the oil tank.

[0046] After hydraulic oil is introduced into the input channel 11, when the hydraulic oil flows to the priority valve 2, it preferentially flows from the P port of the priority valve 2 to the CF port of the priority valve 2. The CF port of the priority valve 2 is directly connected to the first output channel 12, which is connected to the input end of the steering system, so that hydraulic oil can be preferentially supplied to the steering system. When the steering system no longer needs additional hydraulic oil, the P port of the priority valve 2 is connected to the EF port of the priority valve 2, supplying hydraulic oil to the second output channel 13.

[0047] During the process of supplying hydraulic oil to the second output channel 13, the on / off state of the switch valve 4 is adaptively adjusted according to the working requirements of the working system. When the switch valve 4 is in the connected state, the pilot oil in the pilot channel 15 returns to the oil tank, and the P port and T port of the pilot check valve 3 are connected, so that the hydraulic oil is supplied back to the oil tank from the third output channel 14. When the switch valve 4 is in the disconnected state, the oil pressure at the P port and A port of the pilot check valve 3 remains the same, so that the hydraulic oil in the second output channel 13 flows to the working system, thereby enabling the supply of oil to the working system.

[0048] Specifically, by setting an input flow channel 11, a first output flow channel 12, a second output flow channel 13, a third output flow channel 14, and a pilot flow channel 15 on the main valve body 1, the need for piping is eliminated compared to existing technologies, effectively reducing the number of components in the multi-way valve structure, improving assembly efficiency, and enhancing the integration of the multi-way valve structure. Secondly, by integrating the priority valve 2, the pilot check valve 3, and the switching valve 4 into the main valve body 1, the integration of the multi-way valve structure can be further enhanced.

[0049] Therefore, this multi-way valve structure can prioritize the delivery of hydraulic oil to the steering system, and can also selectively deliver hydraulic oil to the working system according to actual working conditions. Secondly, this multi-way valve structure has fewer parts, higher assembly efficiency, and higher integration.

[0050] Specifically, in this embodiment, the multi-way valve structure is applied to construction machinery. The working system is the lifting hydraulic system of the construction machinery, etc. The working system does not include the steering system. The specific structures of the steering system and the lifting hydraulic system are both prior art, so they will not be described in detail here.

[0051] The priority valve 2 includes a first sub-valve body and a first valve core assembly.

[0052] Specifically, such as Figure 1 and Figure 3 As shown, the first sub-valve body is sealed and fixed to the main valve body 1. The first sub-valve body has a first chamber, which includes a first sub-chamber 17, and a second sub-chamber 18 and a third sub-chamber 19 located on both sides of the first sub-chamber 17. The first sub-chamber 17 is directly connected to the input flow channel 11, the second sub-chamber 18 is directly connected to the first output flow channel 12, and the third sub-chamber 19 is directly connected to the second output flow channel 13. The first valve core assembly includes a first valve core 21 and a first elastic element 22. The first valve core 21 is slidably disposed in the first chamber along its own axial direction. The first end of the first elastic element 22 abuts against the first valve core 21, and the second end abuts against the first sub-valve body. The axial force applied to the first valve core 21 enables the first valve core 21 to connect the first chamber and the third sub-chamber 19, and the elastic force of the first elastic element 22 enables the first valve core 21 to connect the first sub-chamber 17 and the second sub-chamber 18.

[0053] Understandably, the P port of priority valve 2 is formed in the first sub-chamber 17 and is directly connected to the input flow channel 11. The CF port of priority valve 2 is formed in the second sub-chamber 18 and is directly connected to the first output flow channel 12. The EF port of priority valve 2 is formed in the third sub-chamber 19 and is directly connected to the second output flow channel 13.

[0054] When hydraulic oil is not flowing through the input channel 11 of the multi-way valve structure, the priority valve 2 remains connected to the first sub-chamber 17 and the second sub-chamber 18. This means the multi-way valve structure maintains a connection between the input channel 11 and the first output channel 12, allowing hydraulic oil to be preferentially delivered directly to the first output channel 12 and flow to the steering system when hydraulic oil is supplied to the input channel 11. When the steering system no longer requires additional hydraulic oil, the hydraulic oil flowing into the first sub-chamber 17 applies an axial force to the first valve core 21. The first valve core 21 moves axially and compresses the first elastic element 22, connecting the first sub-chamber 17 and the third sub-chamber 19, enabling the delivery of hydraulic oil to the second output channel 13. When the supply of hydraulic oil to the input channel 11 of the multi-way valve structure stops, the elastic restoring force of the first elastic element 22 drives the first valve core 21 to move, connecting the first sub-chamber 17 and the second sub-chamber 18, allowing the priority valve 2 to re-establish a connection between the first sub-chamber 17 and the second sub-chamber 18.

[0055] Optionally, the first sub-valve body includes a first valve body body and a first sealing plug 23. The first valve body body is integrally formed on the main valve body 1. The first valve body body is also provided with a first process opening communicating with the first chamber. The first sealing plug 23 seals and blocks the first process opening.

[0056] By integrally molding the first valve body onto the main valve body 1, the priority valve 2 can be integrated into the main valve body 1. This eliminates the need for connecting parts and seals to seal and fix the first valve body onto the main valve body 1, thereby further reducing the number of components in the multi-way valve structure and improving its integration.

[0057] By providing a first process opening that communicates with the first chamber on the first valve body, i.e., providing a first process opening that communicates with the first chamber on the main valve body 1, it is convenient to install the first valve core assembly in the first chamber and to facilitate subsequent maintenance of the first valve core assembly.

[0058] In this embodiment, as Figure 1 and Figure 3 As shown, an exemplary configuration is provided in which the first chamber penetrates the top and bottom of the main valve body 1 to form two first process openings; the number of first sealing plugs 23 is two; the two first sealing plugs 23 and the two first process openings are configured in a one-to-one correspondence, and the two first sealing plugs 23 are respectively located at both ends of the first valve core assembly. It can be understood that the penetration direction of the first chamber is parallel to the axial direction of the first valve core 21. In other embodiments, the first chamber may also be configured to penetrate one end face of the main valve body 1 to form a first process opening, and the number of first sealing plugs 23 may be one.

[0059] In this embodiment, the outer peripheral wall of the first sealing plug 23 is provided with external threads, and the inner peripheral wall of the first chamber is provided with internal threads, with the external and internal threads engaging. Further, a first sealing ring is embedded in the outer peripheral wall of the first sealing plug 23 and / or the inner peripheral wall of the first chamber, the first sealing ring being used to seal the gap between the outer peripheral wall of the first sealing plug 23 and the inner peripheral wall of the first chamber. In other embodiments, the first sealing plug 23 may also be interference-fitted into a first process opening, etc.

[0060] In other embodiments, the main valve body 1 is provided with a first mounting groove communicating with the input flow channel 11, the first output flow channel 12, and the second output flow channel 13. The first valve body is fixedly inserted into the first mounting groove. A second sealing ring is embedded in the inner peripheral wall of the first mounting groove and / or the outer peripheral wall of the first valve body. The second sealing ring is used to seal the gap between the inner peripheral wall of the first mounting groove and the outer peripheral wall of the first valve body. This also allows the priority valve 2 to be integrated into the main valve body 1.

[0061] In this embodiment, as Figure 1 and Figure 3 As shown, the first elastic element 22 is a spring.

[0062] Optionally, such as Figure 1 and Figure 3 As shown, the priority valve 2 also includes a displacement adjusting member 24 and a fastener 25. The displacement adjusting member 24 is threadedly connected to the first sealing plug 23 and abuts against the second end of the first elastic member 22 or the end of the first valve core 21 away from the first elastic member 22. The fastener 25 is used to lock the relative position of the displacement adjusting member 24 and the first sealing plug 23.

[0063] By adjusting the compression of the first elastic element 22 by turning the displacement adjustment component 24, the ease with which the hydraulic oil supplied to the first sub-chamber 17 applies axial force to the first valve core 21 to connect the input flow channel 11 and the second output flow channel 13 can be adjusted, as can the pressure and flow rate of the hydraulic oil flowing out of the second output flow channel 13.

[0064] In this embodiment, as Figure 1 and Figure 3 As shown, one of the first sealing plugs 23 is equipped with a displacement adjusting member 24 and a fastener 25. The displacement adjusting member 24 is threadedly connected to the first sealing plug 23 and abuts against the second end of the first elastic member 22. The fastener 25 is a nut. In other embodiments, both first sealing plugs 23 may also be equipped with displacement adjusting members 24 and fasteners 25.

[0065] In this embodiment, as Figure 1 and Figure 3As shown, the displacement adjusting component 24 includes a screw 241 and a spring seat 242. The screw 241 is threadedly connected to the first sealing plug 23, and the spring seat 242 slides axially within the first chamber, allowing the first valve core 21 to slide freely. Along the axial direction of the first valve core 21, one end of the spring seat 242 abuts against the screw 241, and the other end abuts against the first elastic element 22. Further, a third sealing ring 243 is embedded in the outer peripheral wall of the spring seat 242 and / or the inner peripheral wall of the first sealing plug 23. The third sealing ring 243 is used to seal the gap between the outer peripheral wall of the spring seat 242 and the inner peripheral wall of the first sealing plug 23.

[0066] In this embodiment, as Figure 1 As shown, the main valve body 1 is rectangular. Preferably, the first output end of the first output channel 12, which communicates with the working system, extends through the bottom of the main valve body 1, and the first output end of the first output channel 12 is at least partially parallel to the height direction of the main valve body 1. This further improves the stability and efficiency of the first output channel 12 in delivering hydraulic oil to the input end of the steering system. Specifically, the output end of the first output channel 12 that communicates with the P port of the pilot check valve 3 is the second output end of the first output channel 12.

[0067] Among them, such as Figure 2 and Figure 4 As shown, the pilot check valve 3 includes a second sub-valve body and a second valve core assembly.

[0068] Specifically, such as Figure 2 and Figure 4 As shown, the second sub-valve body is sealed and fixed to the main valve body 1; the second sub-valve body is provided with a second chamber 20, and the second output flow channel 13, the third output flow channel 14 and the pilot flow channel 15 are all connected to the second chamber 20; the second valve core assembly includes a second valve core 31 and a second elastic element 32. The second valve core 31 is slidably disposed in the second chamber 20 along its own axial direction. The second valve core 31 is provided with a through hole 311 that runs through the axis. The two ends of the through hole 311 are connected to the second output flow channel 13 and the pilot flow channel 15 respectively; the first end of the second elastic element 32 abuts against the second valve core 31, and the second end abuts against the second sub-valve body; the axial force applied to the second valve core 31 can make the second valve core 31 connect the second output flow channel 13 and the third output flow channel 14, and the elastic force of the second elastic element 32 can disconnect the second output flow channel 13 and the third output flow channel 14.

[0069] Understandably, the second output flow channel 13 is always connected to the pilot flow channel 15 through the through hole 311. The P port of the pilot check valve 3 is formed in the second chamber 20 and is directly connected to the second output flow channel 13. The T port of the pilot check valve 3 is formed in the second chamber 20 and is directly connected to the third output flow channel 14. The A port of the pilot check valve 3 is formed in the second chamber 20 and is directly connected to the pilot flow channel 15.

[0070] When the switching valve 4 is in the connected state, the hydraulic oil in the pilot flow channel 15 returns to the oil tank, and the hydraulic oil in the second output flow channel 13 applies an axial force to the second valve core 31 and compresses the second elastic element 32, so that the second output flow channel 13 and the third output flow channel 14 are connected through the second chamber 20, thereby allowing the hydraulic oil to return to the oil tank through the third output flow channel 14.

[0071] When the switching valve 4 is in the open state, part of the hydraulic oil in the second output channel 13 flows to the pilot channel 15, so that the oil pressure in the second output channel 13 and the oil pressure in the pilot channel 15 are the same, thereby making the hydraulic oil in the second output channel 13 flow to the working system.

[0072] Optionally, such as Figure 1 , Figure 2 and Figure 4 As shown, the second sub-valve body includes a second valve body body and a second sealing plug 33. The second valve body body is integrally formed on the main valve body 1. The second valve body body is also provided with a second process opening that communicates with the second chamber 20. The second sealing plug 33 seals and blocks the second process opening.

[0073] By integrally molding the second valve body onto the main valve body 1, the pilot check valve 3 can be integrated into the main valve body 1. This eliminates the need for connecting parts and seals to seal and fix the second valve body onto the main valve body 1, thereby further reducing the number of components in the multi-way valve structure and improving its integration.

[0074] By providing a second process opening on the second valve body that communicates with the second chamber 20, i.e., providing a second process opening on the main valve body 1 that communicates with the second chamber 20, it is convenient to install the second valve core assembly into the second chamber 20 and to facilitate subsequent maintenance of the second valve core assembly.

[0075] In this embodiment, as Figure 2 and Figure 4 As shown, an exemplary configuration is provided in which the second chamber 20 extends through the top of the main valve body 1 to form a second process opening. The second elastic element 32 is a spring.

[0076] In this embodiment, the outer peripheral wall of the second sealing plug 33 is provided with external threads, and the inner peripheral wall of the second chamber 20 is provided with internal threads, with the external and internal threads engaging. Further, a fourth sealing ring is embedded in the outer peripheral wall of the second sealing plug 33 and / or the inner peripheral wall of the second chamber 20, the fourth sealing ring being used to seal the gap between the outer peripheral wall of the second sealing plug 33 and the inner peripheral wall of the second chamber 20. In other embodiments, the second sealing plug 33 may also be interference-fitted into a second process opening, etc.

[0077] In other embodiments, the main valve body 1 is provided with a second mounting groove communicating with the second output channel 13, the third output channel 14, and the pilot channel 15. The second valve body is fixedly inserted into the second mounting groove. A fifth sealing ring is embedded in the inner peripheral wall of the second mounting groove and / or the outer peripheral wall of the second valve body. The fifth sealing ring is used to seal the gap between the inner peripheral wall of the second mounting groove and the outer peripheral wall of the second valve body. This also allows the pilot check valve 3 to be integrated into the main valve body 1.

[0078] Optionally, the valve body of the switching valve 4 is integrally formed into the main valve body 1. This further reduces the number of components in the multi-way valve structure and improves the integration of the multi-way valve structure. In other embodiments, the main valve body 1 is provided with a third mounting groove communicating with the pilot flow channel 15, and the valve body of the switching valve 4 is fixedly inserted into the third mounting groove; a sixth sealing ring is embedded in the inner peripheral wall of the third mounting groove and / or the outer peripheral wall of the valve body of the switching valve 4, and the sixth sealing ring is used to seal the gap between the inner peripheral wall of the third mounting groove and the outer peripheral wall of the valve body of the switching valve 4. This also allows the switching valve 4 to be integrated into the main valve body 1.

[0079] In this embodiment, the switching valve 4 is exemplarily configured as an electromagnetic switching valve. The specific structure of the electromagnetic switching valve is prior art and will not be described in detail here.

[0080] Optionally, such as Figure 2 and Figure 4 As shown, the multi-way valve structure also includes a throttle pipe 5, which is disposed within the third output flow channel 14. The throttle pipe 5 is used to regulate the flow rate of the third output flow channel 14. By setting the throttle pipe 5, the flow rate of hydraulic oil flowing from the third output flow channel 14 to the oil tank can be effectively regulated.

[0081] In this embodiment, a multi-way valve structure is applied to construction machinery, and at least a portion of the main valve body 1 is in contact with the heat-generating components of the construction machinery. This arrangement, especially for cold starts of construction machinery, increases the residence time of the hydraulic oil in the third output channel 14, thereby increasing the time for the hydraulic oil in the third output channel 14 to be heated by the main valve body 1. This achieves the purpose of raising the temperature of the hydraulic oil in the tank, effectively reducing the difficulty of cold starts of construction machinery. Furthermore, the heating effect of the hydraulic oil can be further improved by increasing the extension length of the third output channel 14 within the main valve body 1.

[0082] Alternatively, the outer circumference of the throttling pipe 5 is provided with external threads, and the inner circumferential wall of the third output channel 14 is provided with internal threads, with the external and internal threads matching. This arrangement allows the pipe diameter of the throttling pipe 5 to be adaptively adjusted according to actual operating conditions, thereby adjusting the throttling effect.

[0083] Further optional, such as Figure 2 and Figure 4As shown, the throttle pipe 5 is located upstream of the third output channel 14. For cold starts of construction machinery, this also further enhances the heating effect of the hydraulic oil.

[0084] Optionally, such as Figure 1 As shown, the multi-way valve structure also includes a relief valve 6, which is integrated into the main valve body 1. The P port of the relief valve 6 is directly connected to the input flow channel 11. By integrating the relief valve 6 into the multi-way valve structure, the working safety of the multi-way valve structure can be effectively improved, and the oil pressure delivered to the priority valve 2 can be stably delivered. Secondly, it can further reduce the number of parts and improve the integration of the multi-way valve structure.

[0085] Optionally, the body of the overflow valve 6 is integrally formed into the main valve body 1. This further reduces the number of components in the multi-way valve structure and improves its integration. In other embodiments, the main valve body 1 is provided with a fourth mounting groove communicating with the input flow channel 11, and the body of the overflow valve 6 is fixedly inserted into the fourth mounting groove; a seventh sealing ring is embedded in the inner peripheral wall of the fourth mounting groove and / or the outer peripheral wall of the overflow valve 6 body, the seventh sealing ring being used to seal the gap between the inner peripheral wall of the fourth mounting groove and the outer peripheral wall of the overflow valve 6 body. This also allows the overflow valve 6 to be integrated into the main valve body 1.

[0086] The specific structure of the overflow valve 6 is existing technology, so it will not be described in detail here.

[0087] This utility model also provides engineering machinery, including the aforementioned multi-way valve structure. By adopting the above-mentioned multi-way valve structure, the structure of the engineering machinery can be effectively simplified, and the assembly efficiency of the engineering machinery can be improved.

[0088] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A multi-way valve structure, characterized in that, include: The main valve body (1) is provided with an input flow channel (11), a first output flow channel (12), a second output flow channel (13), a third output flow channel (14) and a pilot flow channel (15); Priority valve (2) is integrated into the main valve body (1); the P port of the priority valve (2) is directly connected to the input flow channel (11), the CF port of the priority valve (2) is directly connected to the first output flow channel (12), the first output flow channel (12) is used to connect to the input end of the steering system, and the EF port of the priority valve (2) is directly connected to the second output flow channel (13). The pilot check valve (3) and the switching valve (4) are both integrated into the main valve body (1); the P port of the pilot check valve (3) is directly connected to the second output flow channel (13), the T port of the pilot check valve (3) is directly connected to the third output flow channel (14), the A port of the pilot check valve (3) is connected to the P port of the pilot check valve (3) and is directly connected to the pilot flow channel (15); the switching valve (4) can selectively open and close the inlet and outlet of the pilot flow channel (15); the second output flow channel (13) is also used to connect with the working system; the input flow channel (11), the pilot flow channel (15) and the third output flow channel (14) are all used to connect with the oil tank.

2. The multi-way valve structure according to claim 1, characterized in that, The priority valve (2) includes: The first sub-valve body is sealed and fixed to the main valve body (1); the first sub-valve body is provided with a first chamber, the first chamber including a first sub-chamber (17), and a second sub-chamber (18) and a third sub-chamber (19) located on both sides of the first sub-chamber (17), the first sub-chamber (17) is directly connected to the input flow channel (11), the second sub-chamber (18) is directly connected to the first output flow channel (12), and the third sub-chamber (19) is directly connected to the second output flow channel (13); The first valve core assembly includes a first valve core (21) and a first elastic element (22). The first valve core (21) is slidably disposed in the first chamber along its own axial direction. The first end of the first elastic element (22) abuts against the first valve core (21) and the second end abuts against the first sub-valve body. The axial force applied to the first valve core (21) enables the first valve core (21) to connect the first sub-chamber (17) and the third sub-chamber (19). The elastic force of the first elastic element (22) enables the first valve core (21) to connect the first sub-chamber (17) and the second sub-chamber (18).

3. The multi-way valve structure according to claim 2, characterized in that, The first sub-valve body includes a first valve body body and a first sealing plug (23). The first valve body body is integrally formed on the main valve body (1). The first valve body body is also provided with a first process opening that communicates with the first chamber. The first sealing plug (23) seals and blocks the first process opening.

4. The multi-way valve structure according to claim 3, characterized in that, The priority valve (2) further includes a displacement adjusting member (24) and a fastener (25). The displacement adjusting member (24) is threaded to the first sealing plug (23) and abuts against the second end of the first elastic member (22) or the end of the first valve core (21) away from the first elastic member (22). The fastener (25) is used to lock the relative position of the displacement adjusting member (24) and the first sealing plug (23).

5. The multi-way valve structure according to any one of claims 1-4, characterized in that, The pilot check valve (3) includes: The second sub-valve body is sealed and fixed to the main valve body (1); the second sub-valve body is provided with a second chamber (20), and the second output flow channel (13), the third output flow channel (14) and the pilot flow channel (15) are all connected to the second chamber (20); The second valve core assembly includes a second valve core (31) and a second elastic element (32). The second valve core (31) is slidably disposed in the second chamber (20) along its own axial direction. The second valve core (31) is provided with a through hole (311) that extends along the axial direction. The two ends of the through hole (311) are connected to the second output flow channel (13) and the pilot flow channel (15) respectively. The first end of the second elastic element (32) abuts against the second valve core (31), and the second end abuts against the second sub-valve body. The axial force applied to the second valve core (31) can make the second valve core (31) connect the second output flow channel (13) and the third output flow channel (14). The elastic force of the second elastic element (32) can disconnect the second output flow channel (13) and the third output flow channel (14).

6. The multi-way valve structure according to claim 5, characterized in that, The second sub-valve body includes a second valve body body and a second sealing plug (33). The second valve body body is integrally formed on the main valve body (1). The second valve body body is also provided with a second process opening that communicates with the second chamber (20). The second sealing plug (33) seals the second process opening.

7. The multi-way valve structure according to any one of claims 1-4, characterized in that, The multi-way valve structure also includes a throttling pipe (5), which is disposed in the third output channel (14) and is used to regulate the flow rate of the third output channel (14).

8. The multi-way valve structure according to claim 7, characterized in that, The throttling tube (5) has an external thread on its outer periphery, and the inner peripheral wall of the third output channel (14) has an internal thread, wherein the external thread and the internal thread are thread-matched; and / or, the throttling tube (5) is located upstream of the third output channel (14).

9. The multi-way valve structure according to any one of claims 1-4, characterized in that, The multi-way valve structure also includes an overflow valve (6), which is integrated into the main valve body (1). The P port of the overflow valve (6) is directly connected to the input flow channel (11).

10. Construction machinery, characterized in that, Includes the multi-way valve structure as described in any one of claims 1-9.

Images