Hydraulic control valve
By designing a multi-layer sealing structure for the hydraulic control valve, the problem of poor sealing performance in high-pressure environments was solved, improving sealing performance and the stability of the control process.
Patent Information
- Application Number
- CN202520130749.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Hydraulic control valves often suffer from poor axial sealing in high-pressure environments, leading to an increased risk of leakage and consequently affecting the stability of the control process.
A hydraulic control valve was designed, including a valve body, a slide shaft, a piston, and a valve cover. Through the combination of a large and small piston section sealing structure, combined with the design of a top block and a sealing ring, a multi-layer sealing effect is achieved, enhancing axial sealing performance.
This improves the sealing performance of the hydraulic control valve, reduces the risk of leakage, and ensures the stability and reliability of the control process.
Smart Images
Figure CN223578357U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of hydraulic valve, especially a kind of hydraulic control valve. BACKGROUND
[0002] Hydraulic control valve is a kind of device for controlling the flow direction, pressure or flow of liquid in hydraulic system. It adjusts the working state of hydraulic system by changing the size of the passage through which liquid flows or completely closing the passage, to ensure that mechanical equipment operates in the predetermined manner. Hydraulic control valve is widely used in various industrial machinery, automobile, aircraft and other fields.
[0003] Common hydraulic control valve has a type similar to two-position three-way valve in air pressure control, and the switching of oil passage is realized by the movement of piston rod. The sealing effect of piston plate on piston rod is realized, and the oil passage is separated. The sealing effect of piston plate is realized in the circumferential direction, so that the risk of leakage is increased in the high-pressure use environment of hydraulic oil, and the control process is unbalanced. SUMMARY
[0004] The main purpose of the utility model is to provide a kind of hydraulic control valve, to solve the problem of poor axial sealing effect of hydraulic control valve.
[0005] In order to achieve the above purpose, the utility model provides a kind of hydraulic control valve, comprising:
[0006] Valve body, one end of length direction is provided with working cavity as blind hole, the working cavity is sequentially connected from outside to inside as first oil section, first shaft section, second oil section, second shaft section, third oil section and third shaft section, the diameter of the first shaft section, second shaft section and the third shaft section decreases, the diameter of the first oil section, the second oil section and the third oil section is greater than the first shaft section, the second shaft section and the third shaft section respectively, the side wall of the valve body is provided with first oil port, second oil port and third oil port respectively in correspondence with the first oil section, second oil section and third oil section;
[0007] Sliding shaft, the outer diameter is consistent with the inner diameter of the third shaft section;
[0008] Piston, set in the middle of the length direction of the sliding shaft, the piston includes large column section and small column section connected with each other from outer end to inner end, the outer diameter of the small column section is consistent with the inner diameter of the second shaft section, the outer diameter of the large column section is consistent with the inner diameter of the first shaft section, the thickness of the piston is less than the thickness of the second oil section;
[0009] Valve cover, connected to one end of the length direction of the valve body, the sliding shaft passes through the valve cover, the inner side of the valve cover is provided with top block, the first shaft section is closed by the top block, the end of the top block close to the first shaft section is provided with oil guide hole communicated to the first oil section.
[0010] Further, the length of the large column section is one third to two thirds of the length of the small column section.
[0011] Further, a first sealing ring is arranged on the inner wall of the second oil section near one end of the third shaft section or on the large column section corresponding to the position of the inner wall of the second oil section near one end of the third shaft section.
[0012] Further, a second sealing ring is arranged on the end face of the large column section or the end face of the top block.
[0013] Further, the slide shaft and the piston are integrally formed.
[0014] Further, a pressure relief channel leading to the third oil section or the first oil port is arranged on the inner end of the third shaft section.
[0015] Further, the thickness of the piston is one third to two thirds of the thickness of the second oil section.
[0016] Further, the number of the oil guide holes is multiple and uniformly arranged on the top block.
[0017] Further, the oil guide hole is a straight hole.
[0018] Further, a ring table is arranged on the outer end of the slide shaft, and a third sealing ring is arranged on the outer side of the valve cover corresponding to the position of the ring table, wherein the ring table is in contact with the valve cover when the large column section of the piston is in contact with the second shaft section.
[0019] The hydraulic control valve provided by the utility model has the advantages that the valve cover is connected to one end of the valve body in the length direction, and the slide shaft is arranged through the valve cover. The inner side of the valve cover is provided with a top block, the first shaft section is closed by the top block, and the oil guide hole leading to the first oil section is arranged on the end of the top block near the first shaft section. When the piston is combined with the second shaft section, the large column section of the piston closes the second shaft section in the thickness direction, thereby providing the sealing effect. When the piston is combined with the top block, the large column section of the piston closes the oil guide hole on the top block in the thickness direction, thereby providing the sealing effect. The sealing effects at the above two positions are improved along with the improvement of the driving force of the slide shaft. BRIEF DESCRIPTION OF DRAWINGS
[0020] Fig. 1 is a schematic view of the valve body in the hydraulic control valve of one embodiment of the utility model;
[0021] Fig. 2 is a schematic view of the hydraulic control valve of one embodiment of the utility model (first conduction state);
[0022] Fig. 3is a schematic diagram of a hydraulic control valve (second conduction state) of one embodiment of the utility model;
[0023] Fig. 4 is a schematic diagram of a sliding shaft and a piston in a hydraulic control valve of one embodiment of the utility model.
[0024] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment, with the drawings. DETAILED DESCRIPTION
[0025] It should be understood that the specific embodiments described herein are merely exemplary of the utility model and are not intended to limit the utility model.
[0026] Those skilled in the art can understand that, unless specifically stated otherwise, the singular form "a", "an", "said" "the above" and "the" used herein also include the plural form. It should be further understood that the phrase "comprising" used in the specification of the utility model means that the features, integers, steps, operations, elements, units, modules and / or assemblies exist, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, units, modules, assemblies and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there can be intermediate elements. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.
[0027] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those skilled in the art to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood as having meanings consistent with those in the prior art, and unless specifically defined as here, should not be interpreted as idealized or overly formal.
[0028] Referring to Figs. 1 to 4 , in one embodiment of the utility model, a hydraulic control valve comprises:
[0029] Valve body 100, length direction one end is provided with the working cavity 110 which is blind hole, the working cavity 110 is sequentially connected from outside to inside respectively first oil section 111, first shaft section 112, second oil section 113, second shaft section 114, third oil section 115 and third shaft section 116, the first shaft section 112, second shaft section 114 and the third shaft section 116 decrease in diameter, the diameter of the first oil section 111, the second oil section 113 and the third oil section 115 is greater than the first shaft section 112, the second shaft section 114 and the third shaft section 116 respectively, the side wall of the valve body 100 is provided with first oil port 120, second oil port 130 and third oil port 140 respectively corresponding to the first oil section 111, second oil section 113 and third oil section 115;
[0030] Slide shaft 200, the outer diameter is consistent with the inner diameter of the third shaft section 116;
[0031] Piston 300, set in the length direction of the middle part of the slide shaft 200, the piston 300 includes large column section 310 and small column section 320 connected with each other from the outer end to the inner end, the outer diameter of the small column section 320 is consistent with the inner diameter of the second shaft section 114, the outer diameter of the large column section 310 is consistent with the inner diameter of the first shaft section 112, the thickness of the piston 300 is less than the thickness of the second oil section 113;
[0032] Valve cover 400, connected to one end of the length direction of the valve body 100, the slide shaft 200 passes through the valve cover 400, the inner side of the valve cover 400 is provided with a top block 410, the top block 410 closes the first shaft section 112, the end of the top block 410 close to the first shaft section 112 is provided with an oil guide hole 411 which is communicated to the first oil section 111.
[0033] In the prior art, the hydraulic control valve realizes sealing effect through the piston plate on the piston rod, and separates the oil way, the sealing effect of the piston plate is realized in the circumferential direction, so that the risk of leakage is increased in the high pressure use environment of hydraulic oil, and the control process is unbalanced.
[0034] The hydraulic control valve provided by the utility model, which comprises a valve body 100, a sliding shaft 200, a piston 300 and a valve cover 400. The valve body 100 is provided with a working cavity 110 in the form of a blind hole at one end in the length direction. The working cavity 110 comprises, from the outside to the inside, sequentially connected first oil section 111, first shaft section 112, second oil section 113, second shaft section 114, third oil section 115 and third shaft section 116, and the diameters of the first shaft section 112, the second shaft section 114 and the third shaft section 116 decrease in sequence. The diameters of the first oil section 111, the second oil section 113 and the third oil section 115 are greater than those of the first shaft section 112, the second shaft section 114 and the third shaft section 116 respectively, so that the first oil section 111, the second oil section 113 and the third oil section 115 can realize oil guiding effect respectively. The valve body 100 is provided with a first oil port 120, a second oil port 130 and a third oil port 140 which are in communication with the first oil section 111, the second oil section 113 and the third oil section 115 respectively. The second oil port 130 is the position for the hydraulic oil to enter, and the first oil port 120 and the third oil port 140 are the positions for the hydraulic oil to flow out.
[0035] The outer diameter of the sliding shaft 200 is consistent with the inner diameter of the third shaft section 116, and the inner end of the sliding shaft 200 is fixed on the third shaft section 116.
[0036] The piston 300 is arranged at the middle part of the sliding shaft 200 in the length direction. The piston 300 comprises a large column section 310 and a small column section 320 which are connected to each other from the outer end to the inner end. The outer diameter of the small column section 320 is consistent with the inner diameter of the second shaft section 114. The outer diameter of the large column section 310 is consistent with the inner diameter of the first shaft section 112, and the thickness of the piston 300 is less than the thickness of the second oil section 113.
[0037] The valve cover 400 is connected to one end of the valve body 100 in the length direction, and the sliding shaft 200 passes through the valve cover 400. The valve cover 400 is provided with a top block 410 on the inner side, and the top block 410 seals the first shaft section 112. The end of the top block 410 close to the first shaft section 112 is provided with an oil guiding hole 411 which is in communication with the first oil section 111.
[0038] In operation, when the small column section 320 of the piston 300 is combined with the second shaft section 114, the first oil port 120 and the second oil port 130 are in communication (through the oil guiding hole 411), and the third oil port 140 and the second oil port 130 are sealed. When the large column section 310 of the piston 300 is combined with the valve cover 400 (the oil guiding hole 411 is sealed), the first oil port 120 and the second oil port 130 are sealed, and the third oil port 140 and the second oil port 130 are in communication.
[0039] When the piston 300 is combined with the second shaft segment 114, the large column segment 310 of the piston 300 closes the second shaft segment 114 in the thickness direction, thus improving the sealing effect, and in some embodiments, a sealing ring can be arranged at the corresponding position, thus further improving the sealing effect at the position. When the piston 300 is combined with the top block 410, the large column segment 310 of the piston 300 closes the oil guide hole 411 on the top block 410 in the thickness direction, thus improving the sealing effect, and in some embodiments, a sealing ring can be arranged at the corresponding position, thus further improving the sealing effect at the position. The sealing effect at the above two positions is improved as the driving force of the slide shaft 200 is improved.
[0040] In summary, the valve cover 400 is connected to one end of the valve body 100 in the length direction, and the slide shaft 200 passes through the valve cover 400. The inside of the valve cover 400 is provided with the top block 410, which closes the first shaft segment 112. The end of the top block 410 close to the first shaft segment 112 is provided with the oil guide hole 411 that guides to the first oil segment 111. When the piston 300 is combined with the second shaft segment 114, the large column segment 310 of the piston 300 closes the second shaft segment 114 in the thickness direction, thus improving the sealing effect. When the piston 300 is combined with the top block 410, the large column segment 310 of the piston 300 closes the oil guide hole 411 on the top block 410 in the thickness direction, thus improving the sealing effect, and in some embodiments, a sealing ring can be arranged at the corresponding position, thus further improving the sealing effect at the position. The sealing effect at the above two positions is improved as the driving force of the slide shaft 200 is improved.
[0041] In one embodiment, the length of the large column segment 310 is one third to two thirds of the length of the small column segment 320.
[0042] In this embodiment, the length of the small column segment 320 is increased so that the sealing effect between the piston 300 and the second shaft segment 114 is guaranteed, and the sealing effect of the corresponding large column segment 310 is realized on the end face (closes the oil guide hole 411), so the length of the large column segment 310 can be reduced.
[0043] Referring to Figs. 2 to 3 In one embodiment, a first sealing ring is arranged on the inner wall of the second oil segment 113 close to one end of the third shaft segment 116 at a position corresponding to the large column segment 310 or on the large column segment 310 at a position corresponding to the inner wall of the second oil segment 113 close to one end of the third shaft segment 116.
[0044] In this embodiment, the first sealing ring is arranged to improve the sealing effect when the piston 300 is combined with the second shaft segment 114. The first sealing ring can be arranged on the piston 300 or the valve body 100, and the selection is designed according to the actual application scenario.
[0045] Referring to Figs. 2 to 3In an embodiment, a second sealing ring is arranged on the end face of the large column segment 310 or the end face of the top block 410.
[0046] In the embodiment, the sealing effect between the piston 300 and the top block 410 is improved by arranging the second sealing ring. The second sealing ring can be arranged on the piston 300 or the valve cover 400, and the selection is designed according to the actual application scene.
[0047] In an embodiment, the slide shaft 200 and the piston 300 are integrally formed.
[0048] In the embodiment, the slide shaft 200 and the piston 300 are integrally arranged, which improves the structural strength and reduces the difficulty of installation and disassembly. For example, the two can be integrally formed in a lathe.
[0049] In an embodiment, a pressure relief channel is arranged on the inner end of the third shaft segment 116 and is communicated to the third oil segment 115 or the first oil port 120.
[0050] In the embodiment, the pressure relief channel is arranged to avoid abnormal driving of the slide shaft 200 caused by pressure change during the sliding process of the slide shaft 200 in the third shaft segment 116.
[0051] In an embodiment, the thickness of the piston 300 is one third to two thirds of the thickness of the second oil segment 113.
[0052] In the embodiment, the thickness characteristics of the piston 300 are given. Within the thickness range, the sealing effect can be provided (when combined with the second shaft segment 114), and the normal flow of hydraulic oil can be ensured (when combined with the valve cover 400).
[0053] In an embodiment, the number of oil guiding holes 411 is multiple and is uniformly arranged on the top block 410.
[0054] In the embodiment, the number of oil guiding holes 411 is increased to achieve a more superior oil guiding effect. For example, the number of oil guiding holes 411 is four or eight, and the diameter of the oil guiding hole 411 is designed and selected.
[0055] Referring to Figs. 2 to 3 In an embodiment, the oil guiding hole 411 is a straight hole.
[0056] In the embodiment, the length direction of the oil guiding hole 411 is limited, specifically in a straight line shape, so that the oil guiding hole 411 can achieve a more smooth guiding effect.
[0057] Referring to Figs. 2 to 3In one embodiment, a ring table 210 is arranged at the outer end of the sliding shaft 200 in the circumferential direction, and a third sealing ring is arranged at the position corresponding to the ring table 210 outside the valve cover 400, wherein the ring table 210 is in contact with the valve cover 400 when the large column section 310 of the piston 300 is in contact with the second shaft section 114.
[0058] In the embodiment, the sealing effect at the position of the valve cover 400 is improved by arranging the third sealing ring, and the above sealing effect is realized in the circumferential direction and the radial direction.
[0059] In one embodiment, the material of the piston 300 is copper or aluminum.
[0060] In the embodiment, the material of the piston 300 is selected to have plasticity, which provides conditions for improving the sealing effect.
[0061] In summary, the hydraulic control valve provided by the utility model has the valve cover 400 connected to one end of the valve body 100 in the length direction, and the sliding shaft 200 is arranged through the valve cover 400. The inner side of the valve cover 400 is provided with the top block 410, the first shaft section 112 is closed by the top block 410, and the end of the top block 410 close to the first shaft section 112 is provided with the oil guide hole 411 guiding to the first oil section 111. When the piston 300 is combined with the second shaft section 114, the large column section 310 of the piston 300 closes the second shaft section 114 in the thickness direction, so that the sealing effect is provided. When the piston 300 is combined with the top block 410, the large column section 310 of the piston 300 closes the oil guide hole 411 on the top block 410 in the thickness direction, so that the sealing effect is improved, and the sealing effect at the above two positions is improved with the driving force of the sliding shaft 200.
[0062] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent flow conversion according to the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.
Claims
1. A hydraulic control valve characterized by comprising: The utility model relates to a valve body (100) length direction one end is provided with the working chamber (110) of blind hole, the working chamber (110) is from outside to inside respectively first oil section (111), first axle section (112), second oil section (113), second axle section (114), third oil section (115) and third axle section (116) are sequentially connected, first axle section (112), second axle section (114) and third axle section (116) diameter decreases gradually, first oil section (111), second oil section (113) and third oil section (115) diameter is greater than first axle section (112), second axle section (114) and third axle section (116) respectively, the side wall of valve body (100) is provided with first oil port (120), second oil port (130) and third oil port (140) respectively in correspondence with first oil section (111), second oil section (113) and third oil section (115) and is led through, Sliding shaft (200) outer diameter is consistent with the inner diameter of third axle section (116), Piston (300) is arranged in the middle of the length direction of sliding shaft (200), and the piston (300) comprises a large column section (310) and a small column section (320) connected to each other from the outer end to the inner end, the outer diameter of the small column section (320) is consistent with the inner diameter of the second axle section (114), the outer diameter of the large column section (310) is consistent with the inner diameter of the first axle section (112), and the thickness of the piston (300) is less than the thickness of the second oil section (113), Valve cover (400) is connected to one end of the length direction of valve body (100), sliding shaft (200) passes through valve cover (400) and is arranged, and the inner side of valve cover (400) is provided with a top block (410), the first axle section (112) is closed by the top block (410), and the end of the top block (410) near the first axle section (112) is provided with an oil guide hole (411) communicated to the first oil section (111). The length of the large column section (310) is one third to two thirds of the length of the small column section (320).
2. The hydraulic control valve according to claim 1, characterized in that, A first sealing ring is arranged on the inner wall of the second oil section (113) near the end of the third axle section (116) or on the position of the large column section (310) corresponding to the inner wall of the second oil section (113) near the end of the third axle section (116).
3. The hydraulic control valve according to claim 1, wherein A second sealing ring is arranged on the end face of the large column section (310) or the end face of the top block (410).
4. The hydraulic control valve according to claim 3, characterized in that The sliding shaft (200) and the piston (300) are integrally formed.
5. The hydraulic control valve according to any one of claims 1 to 4, characterized in that, A pressure relief channel is arranged on the inner end of the third axle section (116) and communicated to the third oil section (115) or the first oil port (120).
6. The hydraulic control valve according to any one of claims 1 to 4, characterized by The thickness of the piston (300) is one third to two thirds of the thickness of the second oil section (113).
7. The hydraulic control valve according to any one of claims 1 to 4, characterized by The number of the oil guide holes (411) is multiple and uniformly arranged on the top block (410).
8. The hydraulic control valve according to any one of claims 1 to 4, characterized by The oil guide holes (411) are straight holes.
9. The hydraulic control valve of claim 8, wherein, 10. The hydraulic control valve according to any one of claims 1 to 4, characterized by The outer end of the sliding shaft (200) is provided with a ring table (210) in the circumference, and the valve cover (400) is provided with a third sealing ring corresponding to the position of the ring table (210) outside, wherein when the large column section (310) of the piston (300) is in contact with the second shaft section (114), the ring table (210) is in contact with the valve cover (400).