Speed limiting valve with pressure buffering structure

Abstract

The utility model discloses a speed limiting valve with a pressure buffering structure, which comprises a valve body, one end of the valve body is provided with a liquid outlet, the other end of the valve body is in threaded connection with a liquid inlet end cover, a valve core is mounted in the valve body, and the valve core is tightly propped against the interior of the valve body through the liquid inlet end cover in threaded connection, so that the stable mounting of the valve core is ensured. By arranging the pressure buffering structure, when fluid pressure changes suddenly, the buffering movable frame moves in the valve element, the buffering spring is compressed or stretched, pressure fluctuation is absorbed and buffered, impact force borne by the valve element is reduced, vibration and noise of the valve element are reduced, the stability of the speed limiting valve is improved, and the service life of the speed limiting valve is prolonged. And meanwhile, a second-stage flow slowing structure is arranged in the valve element, so that the fluid is subjected to second-stage flow slowing after passing through the buffering structure, the speed limiting effect on the fluid is improved, and the flowing speed of the fluid can be controlled through an internal throttling plate.

Description

Technical Field

[0001] This utility model relates to the field of forklift hydraulic system application technology, and in particular to a speed limiting valve with a pressure buffer structure. Background Technology

[0002] In the hydraulic control system of a forklift, the speed limiter valve is a key component ensuring its safe and stable operation. During operations such as loading and unloading goods and raising and lowering the forks, the hydraulic system needs to precisely control the fluid flow rate. The speed limiter valve regulates the flow of hydraulic oil to ensure smooth raising and lowering of the forks, preventing safety accidents such as goods falling or equipment damage caused by excessive speed. It plays a vital role in improving the efficiency and safety of forklift operations.

[0003] However, existing forklift speed limiters have many problems in actual operation. When the forklift performs frequent lifting and lowering operations or sudden stops and starts, the fluid pressure in the hydraulic system changes drastically. The instantaneous high or negative pressure will cause a strong impact on the valve core of the speed limiter. This not only causes the valve core to vibrate violently and emit a harsh noise, affecting the working environment, but also accelerates the wear of the valve core, reduces the sealing performance of the valve core, causes hydraulic oil leakage, and shortens the service life of the speed limiter. In addition, the existing buffer structure is difficult to effectively cope with such high-frequency and high-intensity pressure fluctuations during forklift operation, and cannot provide reliable protection for the valve core, thus affecting the overall working performance and stability of the forklift. Therefore, this utility model proposes a speed limiter with a pressure buffer structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a speed limiting valve with a pressure buffer structure. By setting a pressure buffer structure, when the fluid pressure changes suddenly, the buffer movable frame moves in the valve core, the buffer spring is compressed or stretched, absorbs and buffers pressure fluctuations, reduces the impact force on the valve core, thereby reducing the vibration and noise of the valve core, and improving the stability and service life of the speed limiting valve. At the same time, a two-stage slow flow structure is set inside the valve core, so that the fluid undergoes two-stage slow flow after passing through the buffer structure, thereby improving the speed limiting effect of the fluid, and the flow rate of the fluid can be controlled by the internal throttling plate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a speed limiting valve with a pressure buffer structure is provided, including a valve body, one end of which is provided with a liquid outlet, and the other end of which is threadedly connected with a liquid inlet cap;

[0006] The valve core is installed inside the valve body, and the valve core is pressed against the inside of the valve body by the inlet cap connected by threads to ensure stable installation of the valve core.

[0007] The valve core is internally connected to a buffer structure, with one end of the buffer structure abutting against a baffle provided on the inner wall of the valve core, and the other end abutting against the inner step of the liquid inlet end cap, so as to ensure that the buffer structure is limited in its movement between the valve core and the liquid inlet end cap.

[0008] The present invention is further configured such that: the bottom of the liquid inlet cap is provided with a liquid inlet, and the liquid inlet serves as the liquid inlet of the entire speed limiting valve.

[0009] The above technical solution facilitates easy connection to external pipelines using the inlet cap, and allows the liquid to quickly enter the speed limiting valve through the inlet port.

[0010] The present invention is further configured such that: the end face of the liquid inlet cap extends into the interior of the valve body, and a first sealing ring is provided at the connection; and a second sealing ring is provided by pressing the end face of the liquid inlet cap against the end face of the valve body.

[0011] The above technical solution utilizes the first and second sealing rings to seal the connection between the liquid inlet cap and the valve body, preventing fluid leakage during operation.

[0012] The present invention is further configured such that: a throttling plate is fixedly connected to the inner wall of the valve core near the outlet, and the throttling plate has multiple throttling holes inside; the outer wall of the valve core near the throttling plate has multiple first slow flow chamber inlet holes and first slow flow chamber outlet holes on its circumference, and the first slow flow chamber inlet holes and first slow flow chamber outlet holes are connected to the interior of the valve core through the first slow flow chamber inlet holes and first slow flow chamber outlet holes.

[0013] The above technical solution utilizes the inlet and outlet holes of the first slow-flow chamber to facilitate the flow of the internally buffered fluid between the first slow-flow chamber and the valve core, thereby increasing the flow path and improving the effect of slowing down the fluid flow rate.

[0014] The present invention is further configured such that: the baffle is installed inside the valve core near the middle position, and the top of the baffle is tapered; the outer wall of the valve core near the baffle is provided with a plurality of second slow flow chamber inlet holes and second slow flow chamber outlet holes on the circumference of the two sides, and the second slow flow chamber inlet holes and the second slow flow chamber outlet holes are connected to the interior of the valve core.

[0015] The above technical solution utilizes the inlet and outlet holes of the second slow-flow chamber to facilitate the flow of internally buffered fluid between the second slow-flow chamber and the valve core, thereby increasing the flow path and improving the effect of slowing down the fluid flow rate.

[0016] The present invention is further configured such that: the buffer structure includes a movable frame located inside the valve core, a buffer spring is provided at the bottom of the movable frame and is pressed against the liquid inlet cap at the bottom by the buffer spring, and a flow guide plate is installed near the bottom of the inner wall of the movable frame by a snap-fit ​​ring, and a plurality of flow guide holes are evenly opened inside the flow guide plate.

[0017] The above technical solution utilizes a buffer spring to cushion the movable frame subjected to strong fluid impacts, preventing damage to the valve core during prolonged impacts. Simultaneously, the snap-fit ​​guide plate reduces the amount of fluid entering, thereby slowing down the fluid flow rate and achieving a speed-limiting effect on the external structure.

[0018] The present invention is further configured such that: a steel ball is provided inside the movable frame near the top position by a return spring; the outer wall of the movable frame is inclined at the bottom position of the steel ball and has multiple overflow holes in the circumferential direction; the outer wall of the movable frame is inclined near the top position of the guide plate and has multiple connecting holes in the circumferential direction.

[0019] The above technical solution utilizes multiple overflow holes and connecting holes to facilitate the flow of fluid from the interior to the exterior, and achieves fluid slowdown through the reciprocating flow between the valve core and the valve body.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. The speed limiting valve with a pressure buffer structure proposed in this utility model, by setting a pressure buffer structure, when the fluid pressure changes suddenly, the buffer movable frame moves in the valve core, the buffer spring is compressed or stretched, absorbs and buffers the pressure fluctuation, reduces the impact force on the valve core, thereby reducing the vibration and noise of the valve core, and improving the stability and service life of the speed limiting valve.

[0022] 2. The speed limiting valve with pressure buffer structure proposed in this utility model has a two-stage slow flow structure inside the valve core, so that the fluid undergoes a two-stage slow flow after passing through the buffer structure, thereby improving the speed limiting effect of the fluid, and the flow rate of the fluid can be controlled by the internal throttling plate. Attached Figure Description

[0023] Figure 1 This is a structural diagram of a speed limiting valve with a pressure buffer structure according to the present invention;

[0024] Figure 2 This is a cross-sectional view of a speed limiting valve with a pressure buffer structure according to the present invention.

[0025] Figure 3 This is a structural diagram of the valve core in a speed limiting valve with a pressure buffer structure according to this utility model;

[0026] Figure 4 This is a cross-sectional view of the valve core in a speed limiting valve with a pressure buffer structure according to this utility model.

[0027] Figure 5 This is a structural diagram of the buffer structure in a speed limiting valve with a pressure buffer structure according to the present invention;

[0028] Figure 6 This is a cross-sectional view of the buffer structure in a speed limiting valve with a pressure buffer structure according to the present invention.

[0029] In the diagram: 1. Valve body; 11. Outlet; 12. First slow-flow chamber; 13. Second slow-flow chamber; 2. Inlet cap; 21. Inlet; 22. First sealing ring; 23. Second sealing ring; 3. Valve core; 31. Throttling plate; 311. Throttling orifice; 32. Baffle; 33. Inlet hole of the first slow-flow chamber; 34. Outlet hole of the first slow-flow chamber; 35. Inlet hole of the second slow-flow chamber; 36. Outlet hole of the second slow-flow chamber; 4. Buffer structure; 41. Movable frame; 411. Steel ball; 412. Overflow hole; 413. Connecting hole; 42. Spring; 43. Guide plate; 431. Guide hole; 44. Snap ring. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0031] like Figures 1-4 As shown, a speed limiting valve with a pressure buffer structure includes a valve body 1. One end of the valve body 1 is provided with a liquid outlet 11, and the other end is threadedly connected to a liquid inlet cap 2. The bottom of the liquid inlet cap 2 is provided with a liquid inlet 21, which serves as the liquid inlet of the entire speed limiting valve. This facilitates easy connection to an external pipeline via the liquid inlet cap 2, allowing the liquid to quickly enter the interior of the speed limiting valve. The end face of the liquid inlet cap 2 extends into the interior of the valve body 1, and a first sealing ring 22 is provided at the connection. A second sealing ring 23 is formed by pressing the end faces of the liquid inlet cap 2 and the valve body 1 together. The first sealing ring 22 and the second sealing ring 23 can seal the connection between the liquid inlet cap 2 and the valve body 1, preventing fluid leakage during operation.

[0032] A valve core 3 is installed inside the valve body 1, and the valve core 3 is pressed against the inside of the valve body 1 by a threaded inlet cap 2 to ensure stable installation of the valve core 3. A throttling plate 31 is fixedly connected to the inner wall of the valve core 3 near the outlet 11. The throttling plate 31 has multiple throttling holes 311 inside. Multiple first slow-flow chamber inlet holes 33 and first slow-flow chamber outlet holes 34 are respectively circumferentially formed on both sides of the outer wall of the valve core 3 near the throttling plate 31. The first slow-flow chamber inlet holes 33 and first slow-flow chamber outlet holes 34 connect the first slow-flow chamber 12 and the inside of the valve core 3 through the first slow-flow chamber inlet holes 33 and first slow-flow chamber outlet holes 34, which facilitate the flow of the buffered fluid inside the first slow-flow chamber 12. Between the slow-flow chamber 12 and the valve core 3, the flow path is increased, thereby improving the effect of slowing down the fluid flow rate. The baffle 32 is installed inside the valve core 3 near the middle position, and the top of the baffle 32 is tapered. The outer wall of the valve core 3 is provided with multiple second slow-flow chamber inlet holes 35 and second slow-flow chamber outlet holes 36 on both sides near the baffle 32. The second slow-flow chamber inlet holes 35 and the second slow-flow chamber outlet holes 36 connect the interior of the second slow-flow chamber 13 and the valve core 3. The second slow-flow chamber inlet holes 35 and the second slow-flow chamber outlet holes 36 facilitate the flow of the buffered fluid between the second slow-flow chamber 13 and the valve core 3, thereby increasing the flow path and improving the effect of slowing down the fluid flow rate.

[0033] A buffer structure 4 is movably connected inside the valve core 3. One end of the buffer structure 4 abuts against a baffle 32 provided on the inner wall of the valve core 3, and the other end abuts against the inner step of the inlet end cap 2, to ensure that the buffer structure 4 is limited in its movement between the valve core 3 and the inlet end cap 2. The buffer structure 4 includes a movable frame 41 located inside the valve core 3. A steel ball 411 is abutted against the inside of the movable frame 41 near the top by a return spring. The outer wall of the movable frame 41 is sloped at the bottom of the steel ball 411 and has multiple overflow holes 412 in the circumferential direction. The outer wall of the movable frame 41 is sloped near the top of the guide plate 43 and has multiple connecting holes 413 in the circumferential direction, which facilitates the entry of the liquid into the valve core 3. The internal fluid flows to the outside, and the reciprocating flow between the valve core 3 and the valve body 1 achieves the slowing operation of the fluid. The bottom of the movable frame 41 is fitted with a buffer spring 42, and the buffer spring 42 is fitted to the bottom liquid inlet cap 2. The inner wall of the movable frame 41 near the bottom is fitted with a retaining ring 44 to limit the installation of the guide plate 43. The guide plate 43 has multiple guide holes 431 evenly opened inside. The buffer spring 42 can buffer the movable frame 41 under strong impact from the fluid, so as to avoid damage to the valve core 3 during long-term impact. At the same time, the retaining guide plate 43 can reduce the large amount of fluid entering, thereby slowing down the fluid flow rate, thus achieving the speed limiting effect on the external structure.

[0034] In use, the fluid quickly enters the valve body after passing through the inlet cap 2, impacting the guide plate 43. When the guide plate 43 is impacted, it applies the impact force to the movable frame 41. The buffer spring 42 buffers the movable frame 41, which is subjected to strong fluid impact, preventing damage to the valve core 3 during prolonged impact. At the same time, the locked guide plate 43 reduces the amount of fluid entering, thus slowing down the fluid flow rate and achieving a speed limiting effect on the external structure. Finally, the valve core 3 alternately passes through the second slow-flow chamber 13 and the first slow-flow chamber 12 to further slow down the fluid, thereby completing the speed limiting operation of the forklift hydraulic control system and ensuring stability during external lifting.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A speed limiting valve with a pressure buffer structure, comprising a valve body (1), characterized in that: One end of the valve body (1) is provided with a liquid outlet (11), and the other end is threadedly connected to a liquid inlet cap (2). The valve body (1) is equipped with a valve core (3), and the valve core (3) is pressed against the inside of the valve body (1) by the threaded liquid inlet cap (2) to ensure the stable installation of the valve core (3); The valve core (3) is internally connected to a buffer structure (4), and one end of the buffer structure (4) is pressed against a baffle (32) provided on the inner wall of the valve core (3), and the other end is pressed against the inner step of the liquid inlet cap (2) to ensure that the buffer structure (4) is limited in its movement between the valve core (3) and the liquid inlet cap (2).

2. The speed limiting valve with a pressure buffer structure according to claim 1, characterized in that: The bottom of the liquid inlet cap (2) is provided with a liquid inlet (21), and the liquid inlet (21) serves as the liquid inlet of the entire speed limiting valve.

3. A speed limiting valve with a pressure buffer structure according to claim 2, characterized in that: The end face of the liquid inlet cap (2) extends into the interior of the valve body (1), and a first sealing ring (22) is provided at the connection. A second sealing ring (23) is provided between the end face of the liquid inlet cap (2) and the end face of the valve body (1).

4. A speed limiting valve with a pressure buffer structure according to claim 1, characterized in that: A throttling plate (31) is fixedly connected to the inner wall of the valve core (3) near the outlet (11). The throttling plate (31) has multiple throttling holes (311) inside. The outer wall of the valve core (3) has multiple first slow flow chamber inlet holes (33) and first slow flow chamber outlet holes (34) on both sides near the throttling plate (31). The first slow flow chamber (12) and the interior of the valve core (3) are connected through the first slow flow chamber inlet holes (33) and the first slow flow chamber outlet holes (34).

5. A speed limiting valve with a pressure buffer structure according to claim 4, characterized in that: The baffle (32) is installed inside the valve core (3) near the middle position, and the top of the baffle (32) is conical. The outer wall of the valve core (3) near the baffle (32) has multiple second slow flow chamber inlet holes (35) and second slow flow chamber outlet holes (36) respectively. The second slow flow chamber (13) and the interior of the valve core (3) are connected through the second slow flow chamber inlet holes (35) and the second slow flow chamber outlet holes (36).

6. A speed limiting valve with a pressure buffer structure according to claim 1, characterized in that: The buffer structure (4) includes a movable frame (41) located inside the valve core (3). A buffer spring (42) is provided at the bottom of the movable frame (41), and the buffer spring (42) is pressed against the liquid inlet cap (2) at the bottom. A guide plate (43) is installed near the bottom of the inner wall of the movable frame (41) by a snap-fit ​​ring (44). A plurality of guide holes (431) are evenly opened inside the guide plate (43).

7. A speed limiting valve with a pressure buffer structure according to claim 6, characterized in that: The movable frame (41) has a steel ball (411) placed against the top of the interior by a return spring. The outer wall of the movable frame (41) is sloped at the bottom of the steel ball (411) and has multiple overflow holes (412) in the circumferential direction. The outer wall of the movable frame (41) is sloped at the top of the guide plate (43) and has multiple connecting holes (413) in the circumferential direction.

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