Pressure limiting valve with optimized structure
By designing the oil drain port in the pressure limiting valve away from the oil inlet and setting the oil drain groove on the plunger hole wall, the problems of plunger skew and wear are solved, and the plunger is stable and wear-reducing effect is achieved.
Patent Information
- Application Number
- CN202420333187.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-22
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-22
AI Technical Summary
In traditional pressure limiting valve structures, the plunger may deflect due to unbalanced stress, and may be easily scratched by the edge of the oil drain port during movement, resulting in wear.
A pressure limiting valve with an optimized structure is designed, with the oil drain opening radially on the valve body and away from the oil inlet. At least three axial oil drain grooves are arranged on the hole walls of the plunger hole.
With this design, the plunger will not deflect when the valve is opened, nor will it be scratched by the edge of the oil drain port, avoiding wear.
Smart Images
Figure CN222458496U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil pumps, in particular to a pressure limiting valve. Background Art
[0002] The traditional pressure limiting valve structure is as follows Figure 1 As shown, it includes a valve body 1, a plunger 2, a spring 3, and a plug 4. The oil inlet 5 is connected to the inner end of the valve hole, and a step surface is formed at the inner end of the valve hole. The oil drain port 6 is radially arranged at the position of the valve body 1 close to the oil inlet 5. The plunger 2 is a cylindrical structure as a whole. Under the preload force of the spring 3, the closed end face of the plunger 2 is sealed with the step surface. When the high-pressure oil pressure from the oil inlet 5 is greater than the preload force of the spring 3, the plunger 2 will be pushed to move outward, so that the valve is opened, and the high-pressure oil leaks outward through the oil drain port 6. The disadvantage of this structure is that since the oil drain port 6 is radially opened on one side of the valve hole and close to the oil inlet, when the high-pressure oil pushes the plunger 2 to move, the plunger 2 will be deflected due to unbalanced force, which may cause jamming. In addition, during the movement of the plunger 2, the edge of the oil drain port 6 will also scrape the outer peripheral surface of the plunger 2, causing wear on the outer peripheral surface of the plunger 2. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a pressure-limiting valve with optimized structure which can avoid plunger deflection and eccentric wear.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a structurally optimized pressure limiting valve, comprising a valve body, a plunger, a spring, a plug, an oil inlet and an oil drain port, the valve body being provided with a valve hole, the valve hole comprising a plunger hole and a plug hole, the oil inlet being connected to the inner end of the plunger hole and forming a step surface at the inner end of the plunger hole, the plunger being a cylindrical structure as a whole, the end thereof facing the oil inlet being a closed end, the end surface of the closed end being matched with the step surface, the oil drain port being radially opened on the valve body and away from the oil inlet, and at least three axial oil drain grooves being evenly distributed on the hole wall of the plunger hole.
[0005] Preferably, the length of the oil drain groove is smaller than the length of the plunger hole.
[0006] Preferably, the length of the plunger is smaller than the distance between the oil inlet and the oil drain.
[0007] In one embodiment, the spring is mounted between the plunger and the plug, with the inner end of the spring extending into the barrel of the plunger.
[0008] In one embodiment, the diameter of the plugging hole is larger than the diameter of the plunger hole.
[0009] In one embodiment, an annular groove is provided on the outer circumferential surface of the plunger.
[0010] The beneficial effect of the utility model is that since the oil drain port is radially opened on the valve body and far away from the oil inlet, at least three axial oil drain grooves are evenly distributed on the hole wall of the plunger hole, so that the plunger can be set at a position between the oil inlet and the oil drain port, and when the valve is opened, the high-pressure oil from the oil inlet is sequentially discharged outward through the gap between the closed end and the step surface, the oil drain groove, and the oil drain port, and the plunger will not be deflected when moving, and will not be scratched by the edge of the oil drain port. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the structure of a traditional pressure limiting valve;
[0012] Figure 2 This is a structural schematic diagram of the pressure limiting valve in the embodiment of the utility model in a closed state;
[0013] Figure 3 This is a structural schematic diagram of the pressure limiting valve in the embodiment of the utility model in an open state;
[0014] Figure 4 This is a schematic diagram of the external structure of the valve body in the embodiment of the utility model;
[0015] Figure 5 for Figure 4 AA line cross-sectional structural state schematic diagram;
[0016] The accompanying drawings are marked as follows:
[0017] 1——Valve body 2——Plunger 3——Spring
[0018] 4 - Blockage 5 - Oil inlet 6 - Oil drain
[0019] 7——Plunger hole 8——Blocking hole 9——Oil drain groove. DETAILED DESCRIPTION
[0020] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.
[0021] It should be noted in advance that, in the present utility model, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0022] like Figures 2 to 5As shown, a structurally optimized pressure-limiting valve comprises a valve body 1, a plunger 2, a spring 3, a plug 4, an oil inlet 5 and an oil drain port 6. A valve hole is provided on the valve body 1, and the valve hole comprises a plunger hole 7 and a plug hole 8. The aperture of the plug hole 8 is larger than the aperture of the plunger hole 7, and at least three axial oil drain grooves 9 are evenly distributed on the hole wall of the plunger hole 7; the plunger 2 is a cylindrical structure as a whole, and its end facing the oil inlet 5 is a closed end, and the end face of the closed end cooperates with the step surface, the spring 3 is installed between the plunger 2 and the plug 4, and the inner end of the spring 3 extends into the cylinder of the plunger 2, and the outer peripheral surface of the plunger 2 is provided with an annular groove; the oil inlet 5 is connected with the inner end of the plunger hole and forms a step surface on the inner end of the plunger hole; the oil drain port 6 is radially opened on the valve body 1 and away from the oil inlet 5.
[0023] In this embodiment, the length of the oil drain groove 9 is smaller than the length of the plunger hole 7 ; the length of the plunger 2 is smaller than the distance between the oil inlet 5 and the oil drain port 6 .
[0024] Since the oil drain port 6 is radially opened on the valve body 1 and away from the oil inlet 5, at least three axial oil drain grooves 9 are evenly distributed on the hole wall of the plunger hole 7, so that the plunger 2 can be set at a position between the oil inlet 5 and the oil drain port 6. When the valve is opened, the high-pressure oil from the oil inlet 5 is leaked outward through the gap between the closed end and the step surface, the oil drain groove 9, and the oil drain port 6 in sequence. The plunger 2 will not be deflected when moving, and will not be scratched by the edge of the oil drain port 6.
[0025] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are better implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.
Claims
1. A pressure-limiting valve with an optimized structure, comprising a valve body (1), a plunger (2), a spring (3), a plug (4), an oil inlet (5) and an oil drain (6), wherein the valve body (1) is provided with a valve hole, wherein the valve hole comprises a plunger hole (7) and a plug hole (8), wherein the oil inlet (5) is communicated with an inner side end of the plunger hole and forms a step surface on the inner side end of the plunger hole, and wherein: The plunger (2) is of cylindrical structure as a whole, and the end thereof facing the oil inlet (5) is a closed end, the end surface of the closed end being matched with the step surface, the oil drain port (6) is radially opened on the valve body (1) and away from the oil inlet (5), and at least three axial oil drain grooves (9) are evenly distributed on the hole wall of the plunger hole (7).
2. The structure-optimized pressure-limiting valve according to claim 1, characterized in that: The length of the oil drain groove (9) is smaller than the length of the plunger hole (7).
3. The structure-optimized pressure-limiting valve according to claim 1, characterized in that: The length of the plunger (2) is smaller than the distance between the oil inlet (5) and the oil drain port (6).
4. The structure-optimized pressure-limiting valve according to claim 1 or 2, characterized in that: The spring (3) is installed between the plunger (2) and the plug (4), and the inner end of the spring (3) extends into the cylinder of the plunger (2).
5. The structure-optimized pressure-limiting valve according to claim 1 or 2, characterized in that: The diameter of the blocking hole (8) is larger than the diameter of the plunger hole (7).
6. The structure-optimized pressure-limiting valve according to claim 1 or 2, characterized in that: The outer peripheral surface of the plunger (2) is provided with an annular groove.