Balance valve, hydraulic control system and working machine
By designing annular protrusions and guide grooves in the balance valve to form an S-shaped flow path, the problems of cavitation bubbles and high noise in cranes and other operating machinery are solved, and more stable hydraulic control is achieved.
Patent Information
- Application Number
- CN202520436863.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Existing balancing valves are prone to generating cavitation bubbles and producing significant noise in cranes and other operating machinery, which affects the normal operation of the equipment.
A novel balancing valve was designed. By setting annular protrusions and guide grooves on the valve core and valve body, an S-shaped flow path is formed. During the flow process, the oil passes through the throttling and guide grooves, which reduces the flow rate and reduces the generation of cavitation bubbles and noise.
It effectively reduces the generation of cavitation bubbles and noise, and improves the operational stability and smoothness of the equipment.
Smart Images
Figure CN223579079U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of working machines, in particular to a balance valve, a hydraulic control system and a working machine. BACKGROUND
[0002] For working machines, especially cranes, it is often necessary to perform the action of winding and dropping hooks, and a balance valve needs to be provided in the related hydraulic control system in order to balance the load. The balance valve can achieve flow balance through the relative balance of the pressure on both sides or through the method of flow splitting. Its working principle is mainly based on the basic principles of fluid mechanics, and by changing the flow area (i.e. opening) between the valve core and the valve seat, the resistance of the fluid is adjusted, thereby controlling the flow and pressure of the fluid, and then providing back pressure for the load.
[0003] In the balance valve provided in the existing working machines such as cranes, the oil enters the flow groove on the valve core through the throttling channel between the valve core and the valve seat, and then flows to the oil outlet with a straight flow trajectory, that is, the oil entering the flow groove will flow out quickly. This makes it difficult to fill the flow groove when the throttling channel is small, and air cavity bubbles are easily generated, which brings about a large noise.
[0004] Therefore, how to solve or improve the problem of the balance valve easily generating air cavity bubbles and making a large noise in the related art has become an important technical problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL
[0005] Therefore, the present application provides a balance valve, a hydraulic control system and a working machine to solve or improve the problem of the balance valve easily generating air cavity bubbles and making a large noise in the related art.
[0006] In a first aspect, the present application provides a balance valve, comprising:
[0007] A valve body is provided with a valve cavity, an oil inlet, an oil outlet, a first annular protrusion and a second annular protrusion are arranged on the side wall of the valve cavity, the first annular protrusion and the second annular protrusion are located between the oil inlet and the oil outlet, and the first annular protrusion and the second annular protrusion are arranged at intervals to form a first flow guide groove;
[0008] A valve core is arranged in the valve cavity, a third annular protrusion and a fourth annular protrusion are arranged on the side wall of the valve core, the third annular protrusion and the fourth annular protrusion are arranged at intervals to form a second flow guide groove, the first flow guide groove and the second flow guide groove are communicated, a throttling groove is arranged on the third annular protrusion, the throttling groove is communicated with the oil inlet, a fluid passage is formed between the fourth annular protrusion and the second annular protrusion, and the fluid passage is communicated with the oil outlet;
[0009] The valve core can be switched between a first position and a second position. When the valve core is in the first position, a throttling channel is formed between the first annular protrusion and the notch of the throttling groove, so that the throttling groove and the first flow channel are in communication. When the valve core is in the second position, the first annular protrusion closes the notch of the throttling groove, so that the throttling groove and the first flow channel are disconnected.
[0010] Optionally, an annular groove is formed on the inner wall of the valve cavity, the annular groove is located between the third annular protrusion and the fourth annular protrusion, and the notch of the annular groove is smoothly connected with the inner wall of the valve cavity and the side wall of the fourth annular protrusion, respectively.
[0011] Optionally, when the valve core is in the first position, the second annular protrusion at least partially overlaps with the annular groove in the radial direction of the valve core.
[0012] Optionally, a fifth annular protrusion is arranged on the valve core, the fifth annular protrusion is arranged in a spaced manner with the third annular protrusion to form an annular groove, the throttling groove is in communication with the annular groove, and the annular groove is in communication with the oil inlet.
[0013] Optionally, the throttling groove is provided with at least two throttling grooves, and each throttling groove is uniformly arranged along the circumferential direction of the third annular protrusion.
[0014] Optionally, a piston and an elastic member are further included, the piston is slidably arranged in a piston cavity formed in the valve body, the piston is connected with the inner wall of the piston cavity through the elastic member, a first oil port and a second oil port are arranged on the cavity wall of the piston cavity, the first oil port is in communication with the oil inlet, the second oil port is in communication with the oil outlet and is located on the side of the piston away from the elastic member.
[0015] The piston can slide between a third position and a fourth position. When the piston slides to the third position, the first oil port and the second oil port are disconnected. When the piston slides to the fourth position, the first oil port and the second oil port are in communication. Under the elastic force of the elastic member, the piston is located in the fourth position.
[0016] Optionally, when the piston slides to the third position, the first oil port and the second oil port are located on the two sides of the piston, respectively. When the piston slides to the fourth position, the first oil port and the second oil port are located on the same side of the piston.
[0017] Optionally, the valve body is provided with an oil inlet channel, and the oil inlet channel is in communication with the oil inlet.
[0018] And / or, the valve body is provided with an oil outlet channel, which is in communication with the oil outlet.
[0019] In a second aspect, the application also provides a hydraulic control system comprising any of the above-mentioned balance valves.
[0020] In a third aspect, the application also provides a working machine comprising any of the above-mentioned balance valves or hydraulic control systems.
[0021] The balance valve provided by the application comprises a valve body and a valve core. The valve body is provided with a valve cavity. The side wall of the valve cavity is provided with an oil inlet, an oil outlet, a first annular protrusion and a second annular protrusion. The first annular protrusion and the second annular protrusion are both located between the oil inlet and the oil outlet, and the first annular protrusion and the second annular protrusion are spaced apart to form a first flow guide groove. The side wall of the valve core is provided with a third annular protrusion and a fourth annular protrusion, and the third annular protrusion and the fourth annular protrusion are spaced apart to form a second flow guide groove. A throttling groove is arranged on the third annular protrusion. The valve core can be switched between a first position and a second position after being arranged in the valve cavity. The throttling groove is in communication with the oil inlet, the first flow guide groove is in communication with the second flow guide groove, and a fluid channel is formed between the fourth annular protrusion and the second annular protrusion. When the valve core is switched to the first position, a throttling channel is formed between the first annular protrusion and the slot opening of the throttling groove. When the valve core is switched to the second position, the first annular protrusion closes the slot opening of the throttling groove, so that the throttling groove and the first flow guide groove are disconnected.
[0022] In use of the balance valve, the valve core is switched to the second position, and oil is introduced from the oil inlet. Then the valve core is switched to the first position, so that a throttling channel is formed between the first annular protrusion and the slot opening of the throttling groove. After the throttling channel is formed, the oil flows from the throttling groove on the valve core to the first flow guide groove on the valve body through the throttling channel, and then needs to pass through the first flow guide groove and the second flow guide groove in sequence to flow to the fluid channel and then flow out through the oil outlet slot. The oil is blocked by the second annular protrusion and the fourth annular protrusion during the flow process, which reduces the speed of the oil flowing to the oil outlet. Even if the oil flow through the throttling channel is small, the first flow guide groove and the second flow guide groove can be filled as soon as possible, thereby reducing the generation of cavitation bubbles and noise. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the specific embodiments or the related art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the related art description. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.
[0024] Figure 1A cross-sectional view of a balanced valve according to an embodiment of the present application;
[0025] Figure 2 A cross-sectional view of a balanced valve according to an embodiment of the present application; Figure 1 A partial enlarged view of A in the cross-sectional view of the balanced valve according to an embodiment of the present application;
[0026] Figure 3 A cross-sectional view of a balanced valve according to an embodiment of the present application; Figure 1 A partial enlarged view of B in the cross-sectional view of the balanced valve according to an embodiment of the present application;
[0027] Figure 4 A cross-sectional view of a balanced valve according to an embodiment of the present application;
[0028] Figure 5 A cross-sectional view of a balanced valve according to an embodiment of the present application;
[0029] Explanation of reference numerals:
[0030] 1, valve body; 11, valve cavity; 12, oil inlet; 13, oil outlet; 14, first annular protrusion; 15, second annular protrusion; 16, first flow guide groove; 17, fluid passage; 18, piston cavity; 181, first oil port; 182, second oil port; 19, first oil passage; 110, second oil passage; 111, oil inlet passage; 2, valve core; 21, third annular protrusion; 22, fourth annular protrusion; 23, second flow guide groove; 24, throttling groove; 25, throttling passage; 26, annular groove; 27, fifth annular protrusion; 28, annular groove; 3, piston; 4, elastic member. DETAILED DESCRIPTION
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0032] The embodiments of the present application will be described below in combination with Figures 1 to 5 .
[0033] According to the embodiments of the present application, in one aspect, as shown in Figure 5 , a balanced valve is provided, comprising a valve body 1 and a valve core 2.
[0034] As shown in Figure 1 and Figure 2As shown, the valve body 1 is provided with a valve cavity 11, and an oil inlet 12, a first annular protrusion 14, a second annular protrusion 15 and an oil outlet 13 are sequentially arranged on the side wall of the valve cavity 11. The first annular protrusion 14 and the second annular protrusion 15 are both located between the oil inlet 12 and the oil outlet 13, and the first annular protrusion 14 and the second annular protrusion 15 are arranged at intervals to form a first flow guide groove 16.
[0035] The side wall of the valve core 2 is sequentially provided with a third annular protrusion 21 and a fourth annular protrusion 22, wherein the third annular protrusion 21 and the fourth annular protrusion 22 are arranged at intervals to form a second flow guide groove 23, and a throttling groove 24 is arranged on the third annular protrusion 21.
[0036] The valve core 2 is arranged in the valve cavity 11, so that the valve core 2 can be switched between the first position and the second position in the valve cavity 11. After the valve core 2 is arranged in the valve cavity 11, the throttling groove 24 is in communication with the oil inlet 12, the first flow guide groove 16 is in communication with the second flow guide groove 23, the fourth annular protrusion 22 and the second annular protrusion 15 form a fluid passage 17, and the fluid passage 17 is in communication with the oil outlet 13.
[0037] When the valve core 2 is switched to the first position, the first annular protrusion 14 and the notch of the throttling groove 24 form a throttling passage 25, so that the throttling passage 25 communicates the throttling groove 24 with the first flow guide groove 16, and the oil can flow from the throttling groove 24 to the first flow guide groove 16 through the throttling passage 25.
[0038] When the valve core 2 is switched to the second position, the first annular protrusion 14 closes the notch of the throttling groove 24, so that the throttling groove 24 and the first flow guide groove 16 are disconnected.
[0039] Specifically, when the balance valve is used, the balance valve is connected to the hydraulic control system in the working machine, the valve core 2 is switched to the second position, and the oil is introduced from the oil inlet 12. Then the valve core 2 is switched to the first position, so that the first annular protrusion 14 and the notch of the throttling groove 24 form a throttling passage 25. After the throttling passage 25 is formed, the oil flows from the throttling groove 24 on the valve core 2 to the first flow guide groove 16 on the valve body 1 through the throttling passage 25, then from the first flow guide groove 16 on the valve body 1 to the second flow guide groove 23 on the valve core 2, and then from the second flow guide groove 23 to the oil outlet 13 through the fluid passage 17, and then flows out, and the overall flow path is S-shaped.
[0040] In this way, the oil liquid flows out of the throttling channel 25, and then flows through the first flow guide groove 16 and the second flow guide groove 23 in sequence before flowing to the oil outlet through the fluid channel 17. The oil liquid is blocked by the second annular protrusion 15 and the fourth annular protrusion 22 during the flow process, thereby reducing the speed of the oil liquid flowing to the oil outlet 13. Even if the oil liquid flow through the throttling channel 25 is small, the first flow guide groove 16 and the second flow guide groove 23 can be filled as soon as possible, thereby reducing the generation of cavitation bubbles and noise.
[0041] In some embodiments, the valve core 2 is slidably arranged in the valve cavity 11, so as to be capable of sliding between the first position and the second position. The throttling groove 24 is arranged on the side of the first annular protrusion 14 away from the valve core 2. When the valve core 2 slides to the second position, the side of the first annular protrusion 14 away from the valve core 2 abuts against the side of the second annular protrusion 15 away from the inner wall of the valve cavity 11, thereby closing the throttling groove 24. When the valve core 2 slides to the first position, when the throttling groove 24 starts to coincide with the first flow guide groove 16 in the radial direction of the valve core 2, the first annular protrusion 14 starts to form the throttling channel 25 with the opening gradually increasing between the throttling groove 24 and the slot, until the valve core 2 slides to the first position.
[0042] The width of the throttling groove 24 gradually decreases in the direction in which the valve core 2 slides from the second position to the first position, so that when the valve core 2 slides from the second position to the first position, the area in which the throttling groove 24 coincides with the first flow guide groove 16 in the radial direction of the valve core 2 gradually increases at an increasing speed, thereby achieving the throttling effect in a conventional balanced valve.
[0043] In some embodiments, the throttling groove 24 comprises a plurality of throttling sub-grooves arranged in sequence. Each throttling sub-groove is arranged in sequence in the sliding direction of the valve core 2, and the width of each throttling sub-groove gradually decreases in the direction in which the valve core 2 slides from the second position to the first position.
[0044] As an optional embodiment, an annular groove 26 is arranged on the inner wall of the valve cavity 11, wherein the annular groove 26 is located between the third annular protrusion 21 and the fourth annular protrusion 22. The slot of the annular groove 26 is smoothly connected to the inner wall of the valve cavity 11 on one side, and is smoothly connected to the side wall of the fourth annular protrusion 22 on the side close to the third annular protrusion 21 on the other side.
[0045] In this way, the oil liquid flows out of the throttling channel 25, and then flows through the first flow guide groove 16 and the second flow guide groove 23 in sequence before flowing to the oil outlet through the fluid channel 17. The oil liquid is blocked by the second annular protrusion 15 and the fourth annular protrusion 22 during the flow process, thereby reducing the speed of the oil liquid flowing to the oil outlet 13. Even if the oil liquid flow through the throttling channel 25 is small, the first flow guide groove 16 and the second flow guide groove 23 can be filled as soon as possible, thereby reducing the generation of cavitation bubbles and noise.
[0046] The notch of the annular groove 26 is smoothly connected with the inner wall of the valve cavity 11 and the side wall of the fourth annular protrusion 22 respectively, so that the flow of the oil is not blocked.
[0047] In a further embodiment, the second annular protrusion 15 is at least partially aligned with the annular groove 26 in the radial direction of the spool 2 when the spool 2 is switched to the first position.
[0048] When the oil flows in the second flow channel 23, the flow area of the oil is suddenly reduced when the oil flows between the third annular protrusion 21 and the side wall of the valve cavity 11, which affects the flow efficiency of the oil. However, due to the presence of the annular groove 26, part of the oil flows into the annular groove 26 when the oil flows between the third annular protrusion 21 and the side wall of the valve cavity 11, which reduces the impact on the flow efficiency.
[0049] It is worth mentioning that the second annular protrusion 15 can be fully aligned with the annular groove 26 in the radial direction of the spool 2 when the spool 2 is switched to the first position.
[0050] As an optional embodiment, the spool 2 is provided with a fifth annular protrusion 27, the fifth annular protrusion 27 is located on the side of the third annular protrusion 21 away from the fourth annular protrusion 22, and the fifth annular protrusion 27 is spaced apart from the third annular protrusion 21 to form an annular groove 28. The throttle groove 24 is opened on the side of the third annular protrusion 21 away from the side wall of the spool 2, and simultaneously penetrates the side wall of the third annular protrusion 21 away from the fourth annular protrusion 22 to communicate with the annular groove 28. After the spool 2 is arranged in the valve cavity 11, the annular groove 28 communicates with the oil inlet 12.
[0051] In this way, after the oil enters from the oil inlet 12, it first flows into the annular groove 28, and then flows from the annular groove 28 into the throttle groove 24. When the spool 2 is switched to the first position, the throttle passage 25 is formed between the first annular protrusion 14 and the notch of the throttle groove 24, and the oil flows from the annular groove 28 to the first flow channel 16 through the throttle passage 25. Before the oil passes through the throttle passage 25, it first flows through the annular groove 28, which plays a buffering role, avoiding the oil entering from the oil inlet 12 directly impacting the throttle passage 25 to generate cavitation bubbles.
[0052] The spool 2 is provided with an annular groove 28, the spool 2 is provided with a fifth annular protrusion 27, the fifth annular protrusion 27 is spaced apart from the third annular protrusion 21 to form an annular groove 28, the throttle groove 24 communicates with the annular groove 28, and the annular groove 28 communicates with the oil inlet 12.
[0053] As an optional embodiment, the spool 2 is provided with a fifth annular protrusion 27, the fifth annular protrusion 27 is located on the side of the third annular protrusion 21 away from the fourth annular protrusion 22, and the fifth annular protrusion 27 is spaced apart from the third annular protrusion 21 to form an annular groove 28. The throttle groove 24 is opened on the side of the third annular protrusion 21 away from the side wall of the spool 2, and simultaneously penetrates the side wall of the third annular protrusion 21 away from the fourth annular protrusion 22 to communicate with the annular groove 28. After the spool 2 is arranged in the valve cavity 11, the annular groove 28 communicates with the oil inlet 12. Figure 4As shown, the throttle grooves 24 are provided in at least two, and each of the throttle grooves 24 is uniformly arranged along the circumference of the third annular protrusion 21.
[0054] As shown, the throttle grooves 24 are provided in at least two, and each of the throttle grooves 24 is uniformly arranged along the circumference of the third annular protrusion 21. Figure 4 As shown, the throttle grooves 24 are provided in three, and the three throttle grooves 24 are uniformly arranged along the circumference of the third annular protrusion 21. The three throttle grooves 24 are all in communication with the oil inlet 12, and when the valve core 2 is switched to the first position, the first annular protrusion 14 and the openings of the three throttle grooves 24 form throttle passages 25 respectively. The oil can flow to the first flow guide groove 16 through the three throttle passages 25 respectively, thereby increasing the flow efficiency of the oil.
[0055] As an optional embodiment, as shown in Figure 1 and Figure 3 The balance valve further comprises a piston 3 and an elastic member 4. A piston cavity 18 is formed in the valve body 1, and the piston 3 is slidably arranged in the piston cavity 18 and connected to the inner wall of the piston cavity 18 by the elastic member 4. The elastic member 4 can be a spring.
[0056] A first oil port 181 and a second oil port 182 are formed on the cavity wall of the piston cavity 18. The first oil port 181 is in communication with the oil inlet 12, and the second oil port 182 is in communication with the oil outlet 13. The second oil port 182 is located on the side of the piston 3 away from the elastic member 4.
[0057] The piston 3 can slide between a third position and a fourth position. When the piston 3 is in the third position, the first oil port 181 and the second oil port 182 are disconnected. When the piston 3 is in the fourth position, the first oil port 181 and the second oil port 182 are in communication. Under the action of the elastic force of the elastic member 4, the piston 3 is pushed to slide to the fourth position.
[0058] In this way, if oil is fed to the oil outlet 13, since the oil outlet 13 is in communication with the second oil port 182, the oil can enter the piston cavity 18 from the second oil port 182. Since the second oil port 182 is located on the side of the piston 3 away from the elastic member 4, the oil entering the piston cavity 18 pushes the piston 3 to slide from the fourth position to the third position, and the elastic member 4 is compressed. At this time, the first oil port 181 and the second oil port 182 are in communication. The oil can flow to the second oil port 182. Since the first oil port 181 is in communication with the oil inlet 12, the oil can flow from the first oil port 181 to the oil inlet 12.
[0059] However, if oil is fed to the oil inlet 12, the oil can flow to the first oil port 181, but under the action of the elastic force of the elastic member 4, the piston 3 is in the fourth position, and at this time the first oil port 181 and the second oil port 182 are disconnected, so the oil cannot continue to flow to the second oil port 182.
[0060] In this way, the one-way flow of oil from the oil outlet 13 to the oil inlet 12 can be achieved, and the use is more convenient.
[0061] In some embodiments, when the piston 3 slides to the third position, the first oil port 181 and the second oil port 182 are located on both sides of the piston 3, so that the first oil port 181 and the second oil port 182 are located in the chambers on both sides of the piston 3, and the piston 3 cuts off the connection between the first oil port 181 and the second oil port 182.
[0062] When the piston 3 slides to the fourth position, the first oil port 181 and the second oil port 182 are located on the same side of the piston 3, so that the first oil port 181 and the second oil port 182 are located in the same chamber, making the first oil port 181 and the second oil port 182 connected.
[0063] The valve body 1 is provided with a first oil passage 19 and a second oil passage 110. The first end of the first oil passage 19 is connected to the oil inlet 12, and the second end of the first oil passage 19 is connected to the first oil port 181, so that the oil inlet 12 is connected to the first oil port 181 through the first oil passage 19.
[0064] The first end of the second oil passage 110 is connected to the oil outlet 13, and the second end of the second oil passage 110 is connected to the second oil port 182, so that the oil outlet 13 is connected to the second oil port 182 through the second oil passage 110.
[0065] In some embodiments, such as Figure 1 As shown, the valve body 1 is provided with an oil inlet channel 111, which is connected to the oil inlet 12. After the oil inlet channel 111 is connected to the oil inlet pipeline, the oil in the oil inlet pipeline can flow to the oil inlet 12 through the oil inlet channel 111, making the connection more convenient.
[0066] In other embodiments, such as Figure 1 As shown, an oil outlet channel is provided inside the valve body 1, which is connected to the oil outlet 13. After connecting the oil outlet channel to the oil outlet pipeline, the oil in the oil outlet pipeline can flow to the oil outlet 13 through the oil outlet channel, making the connection more convenient.
[0067] It is worth noting that, such as Figure 1 As shown, the oil inlet channel 111 and the oil outlet channel can be set in the valve body 1 at the same time.
[0068] According to an embodiment of this application, another aspect provides a hydraulic control system including any of the aforementioned balance valves. The technical effects of this hydraulic control system are the same as those of the balance valve, and therefore will not be described further.
[0069] According to an embodiment of this application, in another aspect, a working machine is also provided, including the above-mentioned hydraulic control system or any of the above-mentioned balance valves. The technical effects brought by this working machine are the same as those brought by the hydraulic control system or balance valve, and therefore will not be described in detail.
[0070] Although the embodiments of the present application have been described with reference to the accompanying drawings, it will be understood that various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the present application.
Claims
1. A balancing valve, characterized in that, include: The valve body (1) is provided with a valve cavity (11). The side wall of the valve cavity (11) is provided with an oil inlet (12), an oil outlet (13), a first annular protrusion (14) and a second annular protrusion (15). The first annular protrusion (14) and the second annular protrusion (15) are both located between the oil inlet (12) and the oil outlet (13). The first annular protrusion (14) and the second annular protrusion (15) are spaced apart to form a first guide groove (16). A valve core (2) is disposed in the valve cavity (11). A third annular protrusion (21) and a fourth annular protrusion (22) are provided on the side wall of the valve core (2). The third annular protrusion (21) and the fourth annular protrusion (22) are spaced apart to form a second guide groove (23). The first guide groove (16) and the second guide groove (23) are connected. A throttling groove (24) is provided on the third annular protrusion (21). The throttling groove (24) is connected to the oil inlet (12). A fluid channel (17) is formed between the fourth annular protrusion (22) and the second annular protrusion (15). The fluid channel (17) is connected to the oil outlet (13). The valve core (2) can switch between a first position and a second position. When the valve core (2) is in the first position, a throttling channel (25) is formed between the first annular protrusion (14) and the opening of the throttling groove (24) so that the throttling groove (24) and the first guide groove (16) are connected. When the valve core (2) is in the second position, the first annular protrusion (14) closes the opening of the throttling groove (24) so that the throttling groove (24) and the first guide groove (16) are disconnected.
2. The balancing valve according to claim 1, characterized in that, An annular groove (26) is provided on the inner wall of the valve cavity (11). The annular groove (26) is located between the third annular protrusion (21) and the fourth annular protrusion (22). The opening of the annular groove (26) smoothly transitions with the inner wall of the valve cavity (11) and the side wall of the fourth annular protrusion (22).
3. The balancing valve according to claim 2, characterized in that, When the valve core (2) is in the first position, the second annular protrusion (15) at least partially coincides with the annular groove (26) along the radial direction of the valve core (2).
4. The balancing valve according to claim 1, characterized in that, The valve core (2) is provided with a fifth annular protrusion (27), and the fifth annular protrusion (27) and the third annular protrusion (21) are spaced apart to form an annular groove (28). The throttling groove (24) is connected to the annular groove (28), and the annular groove (28) is connected to the oil inlet (12).
5. The balancing valve according to claim 1, characterized in that, At least two throttling grooves (24) are provided, and each throttling groove (24) is uniformly arranged along the circumference of the third annular protrusion (21).
6. The balancing valve according to claim 1, characterized in that, It also includes a piston (3) and an elastic element (4). The piston (3) is slidably disposed in a piston chamber (18) opened in the valve body (1), and the piston (3) is connected to the inner wall of the piston chamber (18) through the elastic element (4). A first oil port (181) and a second oil port (182) are provided on the cavity wall of the piston chamber (18). The first oil port (181) is connected to the oil inlet (12), and the second oil port (182) is connected to the oil outlet (13) and is located on the side of the piston (3) away from the elastic element (4). The piston (3) can slide between the third position and the fourth position. When the piston (3) slides to the third position, the first oil port (181) and the second oil port (182) are disconnected. When the piston (3) slides to the fourth position, the first oil port (181) and the second oil port (182) are connected. Under the elastic force of the elastic member (4), the piston (3) is located in the fourth position.
7. The balancing valve according to claim 6, characterized in that, When the piston (3) is slid to the third position, the first oil port (181) and the second oil port (182) are located on both sides of the piston (3). When the piston (3) is slid to the fourth position, the first oil port (181) and the second oil port (182) are located on the same side of the piston (3).
8. The balancing valve according to claim 1, characterized in that, The valve body (1) is provided with an oil inlet channel (111), which is connected to the oil inlet (12); And / or, the valve body (1) is provided with an oil outlet channel, which is connected to the oil outlet (13).
9. A hydraulic control system, characterized in that, Includes the balance valve as described in any one of claims 1-8.
10. A type of operating machinery, characterized in that, Includes the balance valve as described in any one of claims 1-8 or the hydraulic control system as described in claim 9.