Hot oil flushing valve group

Abstract

The utility model discloses a hot oil flushing valve group, and relates to a hot oil valve group, in particular to a hot oil flushing valve group. Comprising a valve block, a low-pressure end hot oil shuttle valve and a direct-acting overflow valve. A communicating oil way is arranged in the valve block, and the valve block is further provided with a working cavity C1, a working cavity C2 and an oil port T; the low-pressure end hot oil shuttle valve is mounted in the valve block, the C1 working cavity is communicated with a fourth port of the low-pressure end hot oil shuttle valve, and the C2 working cavity is communicated with a second port of the low-pressure end hot oil shuttle valve; the direct-acting overflow valve is installed in the valve block, a fifth oil inlet of the direct-acting overflow valve is communicated with a third port of the low-end and low-pressure-end hot oil shuttle valve, and a damper is arranged above a sixth oil outlet of the direct-acting overflow valve. Automatic switching of high-temperature oil liquid, pressure stabilization and system protection are achieved; the modular and integrated design is adopted, the structure is compact, maintenance is convenient, and the device is suitable for engineering vehicles and other harsh working conditions.

Description

Technical Field

[0001] This application relates to hot oil valve assemblies, and more particularly to a hot oil flushing valve assembly. Background Technology

[0002] Hot oil flushing valve assemblies are widely used in engineering vehicles, such as in the hydraulic systems of cleaning trucks, tow trucks, and slag removal machines. However, in related technologies, the valve body structure is fragmented, making disassembly difficult. Furthermore, most hot oil shuttle valves in these technologies discharge oil from the high-pressure end via pressure differential. Therefore, these related technologies have significant limitations and shortcomings. This application provides an integrated design for a simple structure where the oil at the low-pressure end of the hot oil shuttle valve is connected to a common port. The high internal pressure signal at the port discharges the oil from the low-pressure end for cooling or filtration purposes. This design ensures stable and reliable operation for extended periods and simple maintenance, requiring only periodic inspection and replacement of components. Utility Model Content

[0003] To overcome the shortcomings of related technologies, this application provides a hot oil flushing valve assembly, including a valve block, a low-pressure end hot oil shuttle valve, and a direct-acting relief valve; the hot oil flushing valve assembly is internally provided with a connecting oil circuit.

[0004] The valve block is equipped with a C1 working chamber, a C2 working chamber, and a T oil port;

[0005] The low-pressure end hot oil shuttle valve is installed inside the valve block. The C1 working chamber is connected to the shuttle valve port 4, and the C2 working chamber is connected to the shuttle valve port 2. The low-pressure end hot oil shuttle valve includes a first valve cap and a first valve sleeve, which are fixedly connected. A first valve core is provided inside the first valve sleeve, and a first limiting ring and a second limiting ring are respectively provided on the side wall of the first valve core. An annular first oil chamber and a second oil chamber are provided inside the first valve sleeve. The first limiting ring and the second limiting ring cooperate to block or open the first oil chamber and the second oil chamber, respectively. An annular first limiting plate is provided above the second limiting ring, and a first spring is fixedly connected above the first limiting plate. The first oil chamber or the second oil chamber is connected to the shuttle valve port 4 and the shuttle valve port 2, respectively. When the first oil chamber or the second oil chamber is open, it is connected to the shuttle valve port 3. The shuttle valve port 3 is connected to the direct-acting relief valve inlet port 5.

[0006] A direct-acting relief valve is installed inside a valve block. The valve body of the direct-acting relief valve includes a second valve cap and a second valve sleeve, which are fixedly connected. A second valve core and a second limiting plate are provided inside the second valve sleeve. A second spring is provided on the side of the second limiting plate away from the shuttle valve port 3, and the second limiting plate can push the second spring to move. The shuttle valve port 3 is the oil inlet of the direct-acting relief valve, and the direct-acting relief valve is also provided with an oil outlet. When the flowing oil pushes the second valve core, the second limiting plate and the second spring to move, the second limiting plate opens the oil outlet of the relief valve.

[0007] A damper is installed below the direct-acting relief valve;

[0008] The damper is provided with a No. 6 oil outlet; the oil flowing out of the overflow valve outlet (36) passes through the damper and then flows out from the No. 6 oil outlet, which is connected to the T oil port.

[0009] Furthermore, the first valve sleeve is also provided with a first oil chamber, a second oil chamber, and two first oil passages. One end of the two first oil passages on the same side is connected to the first oil chamber and the second oil chamber respectively, and the other end of the two first oil passages is connected to the first oil cavity and the second oil cavity respectively. The oil entering the C1 working chamber and the C2 working chamber is connected to the first oil chamber and the second oil chamber from the shuttle valve port 4 and the shuttle valve port 5 respectively, and is connected to the two first oil passages respectively, and is connected to the first oil cavity and the second oil cavity respectively.

[0010] Furthermore, the second valve core is provided with a first slot, which, in conjunction with the limiting protrusion of the second limiting plate, enables the second valve core to push the second limiting plate to move.

[0011] Furthermore, two oblique second oil passages are provided on the right side of the shuttle valve No. 3 port, and an annular arc groove is provided on the side wall of the second valve core to form a third oil chamber.

[0012] Furthermore, the direct-acting relief valve is set to a pressure of 16 bar.

[0013] Furthermore, the oil circuit layout of the hot oil flushing valve assembly is in parallel.

[0014] Furthermore, the valve block is provided with two insertion holes, which allow for quick replacement.

[0015] Furthermore, the first valve core of the low-pressure end hot oil shuttle valve is made of tungsten carbide, and the seal is a metal bellows structure. The first valve core of the low-pressure end hot oil shuttle valve adopts hydraulic braking and integrates a metal hard seal structure.

[0016] Furthermore, the damping is configured as an adjustable throttling structure to suppress oil pressure fluctuations.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. In related technologies, hot oil shuttle valves mostly discharge oil from the high-pressure end through pressure difference. Low-pressure hot oil shuttle valves are suitable for high-temperature oil environments, utilizing the strong internal pressure signal at the oil port to discharge oil from the low-pressure end for cooling or filtration purposes. Low-pressure hot oil shuttle valves also have a delayed switching function to prevent sudden changes in flow rate in the lower section of the hot oil circuit. The first valve core of the low-pressure hot oil shuttle valve uses hydraulic braking to eliminate mechanical shock and prevent internal damage.

[0019] 2. The integrated design of the hot oil valve assembly in this application results in a simple and compact structure, high reliability, stable and reliable operation, and long-term use.

[0020] 3. The hot oil valve assembly of this application is simple and convenient to maintain, requiring only periodic inspection and replacement of inserts. The modular valve block structure and plug-in valve components support quick replacement.

[0021] 4. The low-pressure end hot oil shuttle valve adopts a metal hard seal, and the valve body is made of 316L stainless steel, which can withstand high-temperature oil of 400℃.

[0022] 5. The hot oil valve assembly of this application is shock resistant: the hydraulic brake valve core + damping design eliminates mechanical vibration caused by transient flow changes. Attached Figure Description

[0023] Figure 1 This is a front view schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a top view of the overall structure of an embodiment of this application.

[0025] Figure 3 yes Figure 2 A schematic cross-sectional view of the overall structure of the embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the oil flow principle of the hot oil flushing valve assembly according to an embodiment of this application.

[0027] Figure 5 This is an enlarged schematic diagram of the low-pressure end hot oil shuttle valve part of an embodiment of this application.

[0028] Figure 6 This is an enlarged schematic diagram of the direct-acting relief valve structure according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached diagram: 1. Valve block; 2. Low-pressure end hot oil shuttle valve; 3. Direct-acting relief valve; 4. Shuttle valve port 4; 5. Shuttle valve port 2; 6. Shuttle valve port 3; 7. First valve core; 8. First spring; 11. Oil inlet port 5; 12. Oil outlet port 6; 13. Damping; 14. Screw plug; 17. Second valve core; 18. Second spring; 19. Insertion hole; 20. First oil passage; 21. First valve cap; 22. First valve sleeve; 23. First oil chamber; 24. Second oil chamber; 25. First limiting ring; 26. Second limiting ring; 27. First limiting plate; 28. First oil chamber; 29. ​​Second oil chamber; 31. Second valve cap; 32. Second valve sleeve; 33. Second oil passage; 34. Second limiting plate; 35. Third oil chamber; 36. Relief valve outlet; 37. First slot. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6This application will be described in further detail.

[0031] Reference Figure 1 and Figure 2 This application discloses a hot oil flushing valve assembly, including a steel valve block 1, a direct-acting relief valve 3, and a low-pressure hot oil shuttle valve 2. The valve block 1 is provided with a C1 working chamber, a C2 working chamber, and a T-port. The hot oil flushing valve assembly has interconnected oil passages inside. The oil passages of the valve block 1 are arranged in parallel for easy maintenance.

[0032] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 The low-pressure end hot oil shuttle valve 2 is installed inside the valve block 1. The C1 working chamber is connected to the shuttle valve's port 4 (④), and the C2 working chamber is connected to the shuttle valve's port 5 (②). The valve block 1 has two insertion holes. These holes are used to insert plug-in valve components, allowing for quick replacement. The insertion holes also facilitate maintenance and repair: component replacement or system maintenance can be performed easily without completely disassembling the entire valve structure.

[0033] The low-pressure end hot oil shuttle valve 2 includes a first valve cap 21 and a first valve sleeve 22, which are fixedly connected by a threaded connection. A first valve core 7 is disposed inside the first valve sleeve 22. The main body of the first valve core 7 is cylindrical to ensure linear movement within the first valve sleeve 22. A first limiting ring 25 and a second limiting ring 26 are respectively disposed on the side wall of the first valve core 7. A first oil chamber 28 is disposed at the upper part of the first valve sleeve 22, and a second oil chamber 29 is disposed at the lower part. An annular first oil cavity 23 and a second oil cavity 24 are also disposed inside the first valve sleeve 22. The first oil cavity 23 is close to the shuttle valve's fourth port 4, i.e., close to the C1 working chamber. The second oil cavity 24 is close to the shuttle valve's second port 5, i.e., close to the C2 working chamber. The first valve sleeve 22 is also provided with two first oil passages 20. One end of each first oil passage 20 is connected to the first oil chamber 28 and the second oil chamber 29, respectively. The other end of each first oil passage 20 is connected to the first oil chamber 23 and the second oil chamber 24, respectively. The oil entering the C1 working chamber and the C2 working chamber is connected to the first oil chamber 28 and the second oil chamber 29 through the shuttle valve port 4 and the shuttle valve port 25, respectively. It is connected to the two first oil passages 20 and the first oil chamber 23 and the second oil chamber 24. An annular first limiting plate 27 is provided above the second limiting ring 26. The first spring 8 is fixedly connected above the first limiting plate 27. The first limiting ring 25 and the second limiting ring 26 cooperate to block or open the first oil chamber 23 and the second oil chamber 24, respectively. When the first oil chamber 23 or the second oil chamber 24 is opened, it is connected to the shuttle valve port 3, which is connected to the direct-acting relief valve 3 inlet port 5 11.

[0034] Reference Figure 3Low-pressure end hot oil shuttle valve pressure balance state: When the pressure of the two working chambers C1 and C2 is equal, that is, when the pressure of port 4 of the low-pressure end hot oil shuttle valve and port 5 of the shuttle valve are equal, the first valve core 7 of the shuttle valve is in the neutral position under the action of the first spring 8, the width of the first limiting ring 25 is greater than the width of the first oil chamber 23, the first limiting ring 25 blocks the first oil chamber 23, the width of the second limiting ring 26 is greater than the width of the second oil chamber 24, the second limiting ring 26 blocks the second oil chamber 24, and all oil ports are closed.

[0035] When the pressures of the two working chambers of the low-pressure hot oil shuttle valve are unequal, the pressure difference drives the low-pressure end of the low-pressure hot oil shuttle valve to connect with the common port shuttle valve port 3 (6), i.e., ③. When the pressure in working chamber C1 is higher than that in working chamber C2, the first valve core 7 moves towards working chamber C2, i.e., moves downward. The first limiting ring 25 blocks the first oil chamber 23, and the second limiting ring 26 no longer blocks the second oil chamber 24, creating a gap that allows oil to pass through. The second oil chamber 24 connects to shuttle valve port 3 (6), and the low-pressure end of the low-pressure hot oil shuttle valve connects with the common port shuttle valve port 3 (6), i.e., ③, that is, shuttle valve port 2 (5) and shuttle valve port 3 (6) are connected. Conversely, refer to... Figure 5 When the pressure in working chamber C2 is higher than that in working chamber C1, the first valve core 7 moves upward in the opposite direction, causing the first limiting plate 27 to move upward and compressing the first spring 8. The second limiting ring 26 still blocks the second oil chamber 24, but the first limiting ring 25 no longer blocks the first oil chamber 23, creating a gap that allows oil to pass through. The first oil chamber 23 connects to the shuttle valve's third port 6, meaning that oil flows from the gap along the outer wall of the first valve core 7 to the shuttle valve's third port 6. The shuttle valve's fourth port 4 is connected to the shuttle valve's third port 6. After being compressed to a certain extent, the first spring 8 deforms and returns to its original shape, pushing the first limiting plate 27 downward to reset.

[0036] The low-pressure end hot oil shuttle valve is suitable for high-temperature oil environments. It utilizes the strong internal pressure signal at the oil port to discharge oil from the low-pressure end for cooling or filtration purposes. The low-pressure end hot oil shuttle valve also features a delayed switching function to prevent sudden changes in flow rate in the lower section of the hot oil circuit.

[0037] The first valve core 7 of the low-pressure end hot oil shuttle valve 2 employs hydraulic braking to eliminate mechanical shock and prevent internal damage. The first valve core 7 of the low-pressure end hot oil shuttle valve is made of tungsten carbide, and the seal is a metal bellows structure. The low-pressure end hot oil shuttle valve 2 uses a metal hard seal, and the valve body is made of 316L stainless steel, capable of withstanding oil temperatures up to 400℃.

[0038] Reference Figure 1 , Figure 3 , Figure 4 and Figure 6A direct-acting relief valve 3 is installed inside the valve block 1, and the set pressure of the direct-acting relief valve 3 is 16 bar. The direct-acting relief valve 3 has an overflow protection mechanism, thereby ensuring that the oil at the low-pressure end of the low-pressure end hot oil shuttle valve 2 has a certain back pressure, preventing the oil at the low-pressure end from running dry, thus protecting the safety and stability of the entire system. The No. 5 oil inlet 11 of the direct-acting relief valve 3 is connected to the No. 3 port 6 of the shuttle valve.

[0039] According to the valve core structure of the direct-acting relief valve 3 in this embodiment, the direct-acting relief valve 3 is configured as a cone valve type relief valve. The valve body of the direct-acting relief valve 3 includes a second valve cap 31 and a second valve sleeve 32. The second valve cap 31 and the second valve sleeve 32 can be fixedly connected by threaded engagement or by protrusion and groove engagement. The second limiting plate 34 can push the second spring 18 to move. The second valve sleeve 32 is provided with a second valve core 17 and a second limiting plate 34. The valve body is provided with a first slot 37 for the second valve core 17, which, in conjunction with the limiting protrusion of the second limiting plate 34, enables the second valve core 17 to push the second limiting plate 34 to move to the right. The second spring 18 is provided on the side of the second limiting plate 34 away from the shuttle valve port 3. Two oblique second oil passages 33 are provided on the right side of the shuttle valve port 3. The side wall of the second valve core 17 is provided with an annular arc groove, forming a third oil chamber 35.

[0040] Oil inlet 11 (No. 5) is the oil inlet of direct-acting relief valve 3, see reference. Figure 4 That is, ⑤, the direct-acting relief valve 3 is also provided with a relief valve outlet 36; when the oil flows in from the shuttle valve No. 3 port 6, passes through the second oil passage 33, and gathers in the third oil chamber 35, it pushes the second valve core 17 to move to the right, and drives the second limit plate 34 and the second spring 18 to move to the right, the second limit plate 34 opens the relief valve outlet 36.

[0041] The overflow valve is normally closed, with the preload of the second spring 18 keeping it closed. When the system pressure exceeds the set value of the second spring 18, the fluid pressure in the third oil chamber 35, which pushes the second valve core 17 of the overflow valve to the right, drives the second limit plate 34 to the right, opening the overflow channel. The third port 6 of the shuttle valve then connects to the oil outlet 36 of the overflow valve, allowing excess fluid to be discharged. After the pressure decreases, the second spring 18, compressed to a certain extent, deforms and returns to its original shape, resetting the second valve core 17 and closing the channel.

[0042] A damper 13 is installed below the oil outlet 36 of the overflow valve for hydraulic braking and delay switching: During the movement of the second valve core 17, the oil generates hydraulic resistance through the damping orifice or throttling structure, slowing down the movement speed of the second valve core 17 and avoiding transient flow changes and mechanical shocks during oil circuit switching. When the pressure increases, the cone core is lifted by hydraulic thrust, and the oil overflows along the annular gap of the cone surface.

[0043] When the pressure does not exceed the set value, the system pressure acts on the side wall of the second valve core 17 through the No. 5 oil inlet 11 and the second oil passage 33. When the pressure is less than the preload of the second spring 18, the second valve core 17 is pressed tightly against the second valve sleeve 32 under the action of the spring force, and the oil cannot pass through, and the overflow valve is closed.

[0044] When the pressure exceeds the set value, when the system pressure rises to exceed the preload of the second spring 18, the hydraulic thrust overcomes the spring force and pushes the second valve core 17 to the right, and the oil flows out from the overflow valve outlet 36, and the system pressure drops.

[0045] When the system pressure decreases, the second spring 18 pushes the second valve core 17 back to reset, closing the oil circuit and restoring the system pressure to the set value.

[0046] The cone valve type relief valve has good sealing performance, low leakage, and high pressure resistance. Applications: Used in the hydraulic systems of cleaning trucks, tow trucks, and slag removal machines.

[0047] A damper 13 is located below the direct-acting relief valve 3; an oil outlet 12 (number 6) is located below the damper 13, as shown in the reference. Figure 4 That is, ⑥; the oil flowing out of the overflow valve outlet 36 passes through the damper 13 and then flows out from the sixth outlet 12, which is connected to the T-port. The damper 13 is set as an adjustable throttling structure to suppress oil pressure fluctuations.

[0048] The working principle of this application embodiment:

[0049] During installation, connect the hot oil valve assembly to the hydraulic pump and actuator via a flange; ensure that the C1 working chamber and C2 working chamber correspond to the high and low pressure oil circuits; high-temperature oil enters from the C1 and C2 working chambers, and the low-pressure end hot oil shuttle valve 2 automatically selects the path according to the pressure difference; the direct-acting relief valve 3 limits the system pressure, and the damper 13 smooths the oil fluctuations; this facilitates regular checks on the shuttle valve sealing and replacement of the relief valve insert or damper 13.

[0050] In summary, hot oil flushing valve assemblies are widely used in engineering vehicles, such as in the hydraulic systems of cleaning trucks, tow trucks, and slag removal machines. This application features a compact structure, achieving efficient oil filtration, pressure stabilization, and system protection. Furthermore, the embodiments of this application avoid the shortcomings of insufficient high-temperature resistance, preventing leakage caused by the aging of traditional shuttle valve seals due to high temperatures; they also prevent mechanical shocks caused by pressure fluctuations and sudden changes in flow rate during oil circuit switching, enhancing system stability; and they facilitate maintenance, significantly improving equipment reliability and service life.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hot oil flushing valve assembly, characterized in that, It includes a valve block (1), a low-pressure end hot oil shuttle valve (2), and a direct-acting relief valve (3); the hot oil flushing valve assembly is internally provided with a connecting oil circuit; The valve block (1) is provided with a C1 working chamber, a C2 working chamber, and a T oil port; The low-pressure end hot oil shuttle valve (2) is installed inside the valve block (1). The C1 working chamber is connected to the shuttle valve port 4 (4), and the C2 working chamber is connected to the shuttle valve port 2 (5). The low-pressure end hot oil shuttle valve (2) includes a first valve cap (21) and a first valve sleeve (22). The first valve cap (21) and the first valve sleeve (22) are fixedly connected. A first valve core (7) is provided inside the first valve sleeve (22). A first limiting ring (25) and a second limiting ring (26) are respectively provided on the side wall of the first valve core (7). An annular first oil chamber (23) and a second oil chamber (24) are provided inside the first valve sleeve (22). A limiting ring (25) and a second limiting ring (26) are respectively used to block or open the first oil chamber (23) and the second oil chamber (24); an annular first limiting plate (27) is provided above the second limiting ring (26), and a first spring (8) is fixedly connected above the first limiting plate (27); the first oil chamber (23) or the second oil chamber (24) is respectively connected to the shuttle valve port 4 (4) and the shuttle valve port 2 (5), and when the first oil chamber (23) or the second oil chamber (24) is opened, it is connected to the shuttle valve port 3 (6), and the shuttle valve port 3 (6) is connected to the direct-acting overflow valve (3) port 5 (11); A direct-acting relief valve (3) is installed inside the valve block (1). The valve body of the direct-acting relief valve (3) includes a second valve cap (31) and a second valve sleeve (32), which are fixedly connected. The second valve sleeve (32) is provided with a second valve core (17) and a second limiting plate (34). A second spring (18) is provided on the side of the second limiting plate (34) away from the shuttle valve port 3 (6). The second limiting plate (34) can push the second spring (18) to move. The shuttle valve port 3 (6) is the oil inlet of the direct-acting relief valve (3). The direct-acting relief valve (3) is also provided with an relief valve outlet (36). When the flowing oil pushes the second valve core (17), the second limiting plate (34) and the second spring (18) to move, the second limiting plate (34) opens the relief valve outlet (36). A damper (13) is provided below the direct-acting relief valve (3); The damper (13) has a No. 6 oil outlet (12) below it; the oil flowing out of the overflow valve outlet (36) passes through the damper (13) and then flows out from the No. 6 oil outlet (12), which is connected to the T oil port.

2. The hot oil flushing valve assembly according to claim 1, characterized in that, The first valve sleeve (22) is also provided with a first oil chamber (28), a second oil chamber (29) and two first oil passages (20). One end of the two first oil passages (20) on the same side is connected to the first oil chamber (28) and the second oil chamber (29) respectively, and the other end of the two first oil passages (20) is connected to the first oil cavity (23) and the second oil cavity (24) respectively. The oil entering the C1 working cavity and the C2 working cavity is connected to the first oil chamber (28) and the second oil chamber (29) respectively from the shuttle valve port 4 (4) and the shuttle valve port 2 (5), respectively, and is connected to the two first oil passages (20) respectively, and is connected to the first oil cavity (23) and the second oil cavity (24) respectively.

3. The hot oil flushing valve assembly according to claim 1, characterized in that, The second valve core (17) is provided with a first slot (37), which, together with the limiting protrusion of the second limiting plate (34), enables the second valve core (17) to push the second limiting plate (34) to move.

4. The hot oil flushing valve assembly according to claim 1, characterized in that: Two oblique second oil passages (33) are provided on the right side of the shuttle valve No. 3 port (6), and an annular arc groove is provided on the side wall of the second valve core (17) to form a third oil chamber (35).

5. The hot oil flushing valve assembly according to claim 1, characterized in that: The direct-acting relief valve (3) is set to a pressure of 16 bar.

6. The hot oil flushing valve assembly according to claim 1, characterized in that: The oil circuit layout of the hot oil flushing valve group is in parallel.

7. The hot oil flushing valve assembly according to claim 1, characterized in that, The valve block (1) is provided with two insertion holes (19), which can be quickly replaced.

8. The hot oil flushing valve assembly according to claim 1, characterized in that: The first valve core (7) of the low-pressure end hot oil shuttle valve is made of tungsten carbide and is sealed with a metal bellows structure. The first valve core (7) of the low-pressure end hot oil shuttle valve is hydraulically braked and integrated with a metal hard seal structure.

9. The hot oil flushing valve assembly according to claim 1, characterized in that: The damping (13) is configured as an adjustable throttling structure to suppress oil pressure fluctuations.

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