Speed limiting valve

Abstract

The speed limiting valve comprises a valve shell and a connector which are connected in a matched mode, a valve body is arranged in the valve shell, a limiting valve element is assembled in the valve body, an adjusting rod is arranged on the limiting valve element, a spring seat is arranged at the far end of the adjusting rod, a spring is arranged between the spring seat and the valve body, and the adjusting rod is sleeved with a throttling valve element. The adjusting rod is in threaded connection with a locking piece on the outer side of the spring seat, a protruding ring is arranged on the end face, facing the spring seat, of the locking piece, and the spring seat movably sleeves the protruding ring. The spring seat and the adjusting rod are collinear, so that the compression linearity and stability of the spring are improved, and the action stability of the speed limiting valve is ensured; and meanwhile, the convex ring separates the spring seat from the external thread of the adjusting rod, so that the spring seat is prevented from moving to rub the external thread of the adjusting rod, the tooth integrity of the external thread of the adjusting rod is ensured, the locking piece can be smoothly screwed on the adjusting rod, and the reverse speed limiting flow of the speed limiting valve is conveniently adjusted.

Description

Technical Field

[0001] This utility model belongs to the field of speed limiting valve manufacturing technology, and in particular relates to a speed limiting valve. Background Technology

[0002] As a type of one-way hydraulic control valve, the speed limiter valve works by adjusting the relative position of the valve core and the valve body to limit the flow of oil through the valve port, thereby achieving effective control of the speed and position of the hydraulic cylinder.

[0003] Conventional speed limit valves have a conventional structure, such as Figure 1 As shown, the valve includes a valve housing 1, with a connector 2 at one end of the valve housing 1. The connector 2 has an oil port F, and the other end of the valve housing 1 has an oil port B. A valve body 3 is housed inside the valve housing 1, and a flow-limiting valve core 4 is disposed within the valve body 3. An adjusting rod 7 is mounted on the end face of the flow-limiting valve core 4 facing the oil port B. The distal end of the adjusting rod 7 has an external thread and a threaded nut 10. A spring seat 8 is fitted onto the external threaded portion of the adjusting rod 7. A spring 6 is positioned between the adjusting rod 7 and the spring seat 8 and the valve body 3. A throttling valve core 5 is axially mounted on the proximal end of the adjusting rod. By tightening the nut 10, the axial position of the spring seat 8 on the adjusting rod 7 is adjusted, thereby adjusting the reverse flow rate of this speed-limiting valve to meet product usage requirements.

[0004] During use, it was found that because the spring seat 8 is movably mounted on the adjusting rod 7, a large gap is left between the center hole of the spring seat 8 and the adjusting rod 7 to prevent friction between the spring seat 8 and the external thread of the adjusting rod 7 during axial movement, thus avoiding wear on the external thread teeth. However, in this conventional speed limiter valve structure, no guide movement structure is provided between the spring seat 8 and the adjusting rod 7, which cannot ensure that the spring seat 8 and the adjusting rod 7 are collinear. The spring seat 8 positions and supports the spring 6, causing the spring 6 to be slightly deflected. When the spring is compressed and the medium flows in the reverse direction through the speed limiter valve (the oil in the valve body flows from port B to port F), the linearity of the compression deformation of the spring 6 is affected, which ultimately affects the axial movement stability of the flow limiter valve core 4 and the stability of the medium flow within the speed limiter valve. In addition, in this conventional speed limiter valve structure, when the spring seat 8 moves axially, it will wear the external thread of the adjusting rod, causing deformation of the external thread teeth, affecting the smoothness of tightening the nut 10, and making it inconvenient to adjust the position of the spring seat 8. Utility Model Content

[0005] In view of this, the present invention aims to provide a speed limiting valve to improve the stability of the speed limiting valve operation and facilitate the adjustment of the reverse speed limiting flow of the speed limiting valve.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A speed limiting valve, comprising a valve housing and a joint connected to each other, the valve housing is provided with an oil port B, the joint is provided with an oil port F, a valve body is arranged in the valve housing, a limiting valve core is arranged in the valve body, an adjusting rod is arranged on the end face of the limiting valve core facing the oil port B, a spring seat is arranged on the distal end of the adjusting rod, a spring is arranged between the spring seat and the valve body, a throttling valve core is axially sleeved on the proximal end of the adjusting rod, a locking piece is threadedly connected to the adjusting rod outside the spring seat, a convex ring is arranged on the end face of the locking piece facing the spring seat, the spring seat is movably sleeved on the convex ring, and the end faces of the spring seat and the locking piece are attached to each other.

[0008] Further, the inner diameter of the convex ring is larger than the diameter of the threaded hole for connecting the locking piece and the adjusting rod.

[0009] Further, the locking piece is a hexagonal nut structure.

[0010] Further, a locking nut is arranged outside the locking piece on the adjusting rod, and the locking nut and the locking piece are locked and fixed.

[0011] Compared with the prior art, the speed limiting valve has the following advantages:

[0012] In the structure of the speed limiting valve, the convex ring of the locking piece positions and supports the spring seat, so that the spring seat and the adjusting rod are collinear, the straightness and stability of spring compression are improved, and the stability of the speed limiting valve is ensured; meanwhile, the convex ring separates the external threads of the spring seat and the adjusting rod, when the locking piece is screwed to axially adjust the position of the spring seat on the adjusting rod, the movement of the spring seat rubbing the external threads of the adjusting rod is effectively prevented, the integrity of the external thread teeth of the adjusting rod is ensured, the locking piece can be smoothly screwed on the adjusting rod, and the reverse speed limiting flow of the speed limiting valve is conveniently adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings that form a part of the present application serve to provide a further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0014] Figure 1 It is a structural schematic diagram of the existing speed limiting valve;

[0015] Figure 2 It is a structural schematic diagram of the speed limiting valve according to the embodiment of the present application;

[0016] Figure 3 It is Figure 1 It is an enlarged view of A in the middle;

[0017] Figure 4 It is a structural schematic diagram of the locking piece in the embodiment;

[0018] Figure 5This is a schematic diagram of the spring seat structure in this embodiment.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1-Valve housing; 2-Connector; 3-Valve body; 4-Limit valve core; 5-Throttle valve core; 6-Spring; 7-Adjusting rod; 8-Spring seat; 9-Locking element; 91-Protruding ring; 10-Locking nut. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 2 As shown, a speed limiting valve includes a valve housing 1 and a connector 2 that are adapted for connection. The connector 2 is installed at one end of the valve housing 1 and has an oil port F. The other end of the valve housing 1 has an oil port B. The valve housing 1 is internally threaded to a valve body 3. A limiting valve core 4 is installed inside the valve body 3. An adjusting rod 7 is installed at the center of the end face of the limiting valve core 4 facing the oil port B. The center line of the adjusting rod 7 and the center line of the valve body 3 are collinear. The distal end of the adjusting rod 7, i.e., the end furthest from the limiting valve core 4, has an external thread. This external thread is matched with a threaded locking member 9. A spring seat 8 is sleeved on the adjusting rod 7 at the external threaded end. The adjusting rod 7 also has a spring 6 sleeved on it. The spring 6 is compressed and arranged between the spring seat 8 and the valve body 3. A throttling valve core 5 is axially slidably sleeved on the proximal end of the adjusting rod 7.

[0023] Locking element 9 structure Figure 4 As shown, a convex ring 91 is provided on the end face of the locking member 9 facing the spring seat 8. The outer circumference of the convex ring 91 is cylindrical, and the inner diameter of the convex ring 91 is larger than the diameter of the threaded hole used to connect the locking member 9 and the adjusting rod 7. The structure of the spring seat 8 is as follows. Figure 5 As shown, a through hole 81 is formed at its center, corresponding to the convex ring 91, and after assembly, it will have a clearance fit with the convex ring 91. The assembly structure is as follows. Figure 3 As shown, the spring seat 8 is movably fitted onto the convex ring 91, which passes through the through hole 81 of the spring seat 8. The opposite end faces of the spring seat 8 and the locking member 9 are in contact. At this time, the spring seat 8 is positioned and supported by the convex ring 91, ensuring that the spring seat 8 and the adjusting rod 7 are collinear, thus making the spring 6 and the adjusting rod 7 collinear, improving the straightness and stability of the spring compression, and ensuring the stability of the valve core's movement. In addition, the convex ring 91 isolates the external threads of the spring seat 9 and the adjusting rod 7, effectively preventing the spring seat from moving and rubbing against the external threads of the adjusting rod, ensuring the integrity of the teeth of the adjusting rod's external threads, allowing the locking member to be smoothly turned on the adjusting rod, and facilitating the adjustment of the reverse speed limiting flow of the speed limiting valve.

[0024] In this utility model, the locking component 9 is a hexagonal nut structure.

[0025] The utility model discloses, adjust the lock nut 10 of lock piece 9 outside setting of lever 7, lock the lock nut 10 and press lock piece 9, lock the lock nut 10 and press lock piece 9 form double nut lock result, prevent lock piece 9 loose.

[0026] The above merely describes the preferred embodiments of the present utility model, and is not intended to limit the present utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A speed limiting valve comprising a valve housing (1) and a joint (2) connected together, the valve housing (1) is provided with an oil port B, the joint (2) is provided with an oil port F, a valve body (3) is arranged in the valve housing (1), a limiting valve core (4) is assembled in the valve body (3), an adjusting rod (7) is arranged on the end face of the limiting valve core (4) facing the oil port B, a spring seat (8) is arranged on the distal end of the adjusting rod (7), a spring (6) is arranged between the spring seat (8) and the valve body (3), and a throttle valve core (5) is axially slidably sleeved on the proximal end of the adjusting rod (7), characterized in that: The adjusting rod (7) is threadedly connected with a locking member (9) outside the spring seat (8), the locking member (9) is provided with a convex ring (91) towards the end face of the spring seat (8), the spring seat (8) is movably sleeved on the convex ring (91), and the end faces of the spring seat (8) and the locking member (9) are attached to each other.

2. A speed limiting valve according to claim 1, characterised in that: The inner diameter of the convex ring (91) is greater than the hole diameter of the thread hole for connecting the locking member (9) and the adjusting rod (7).

3. A speed limiting valve according to claim 1, wherein: The locking member (9) is a hexagonal nut structure.

4. A speed limiting valve according to claim 1, wherein: The adjusting rod (7) is provided with a locking nut (10) outside the locking member (9), and the locking nut (10) and the locking member (9) are locked and fixed.

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