One-way valve structure in oil cylinder

Abstract

The utility model discloses a one-way valve structure in an oil cylinder, and relates to the related technical field of oil cylinders, the oil cylinder and a one-way valve body, the oil cylinder comprises a cylinder barrel and a cylinder bottom installed at one end of the cylinder barrel, and a vertical oil inlet hole is formed in the cylinder bottom; the one-way valve body is installed on the inner side of the cylinder bottom, a medium channel penetrating through the one-way valve body is formed in the one-way valve body, the two ends of the medium channel are communicated with the oil inlet hole and the cylinder barrel respectively, and the head and the tail of the medium channel are respectively provided with two sets of one-way valve elements. According to the one-way valve, the sealing plug is tightly matched with the valve seat under the action of oil pressure and elastic force of the elastic element, so that a good sealing effect is achieved, oil is effectively prevented from flowing into the oil inlet hole from the one-way valve body, normal work of other integrated modules is guaranteed, and system faults caused by oil backflow are avoided; the mode that a steel ball is matched with a stepped hole in the prior art is replaced, and the problem that a steel ball one-way valve is prone to oil leakage is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a one-way valve structure inside an oil cylinder. Background Art

[0002] At present, hydraulic cylinders are gradually tending towards integration. Many hydraulic cylinders are integrated with mechanisms such as buffering, explosion prevention, and speed limiting. With the increase in integrated modules, there will be some throttling in the oil circuit of the oil cylinder, increasing the starting resistance of the oil cylinder. Therefore, a one-way valve needs to be added to the oil circuit of the oil cylinder to reduce the throttling of the integrated module when the oil cylinder rises, so as to increase the oil passing volume when the oil cylinder starts. At the same time, it is also necessary to ensure that the one-way valve can be closed when the oil cylinder retracts to ensure the normal operation of the integrated module.

[0003] After retrieval, the existing document with the publication number CN217842190U discloses a one-way valve structure for a hydraulic cylinder, including a hydraulic cylinder. The hydraulic cylinder includes a cylinder barrel and a cylinder bottom installed at one end of the cylinder barrel. A vertical oil inlet hole and a horizontal oil outlet hole are provided in the cylinder bottom. A stepped hole is opened at the lower end of the side wall of the cylinder bottom. The thin section of the stepped hole is communicated with the oil inlet hole, and the thick section of the stepped hole is communicated with the inner cavity of the cylinder barrel. A positioning hole communicated with the thick section of the stepped hole is opened at the bottom of the cylinder bottom. A limit pin with the upper end extending into the thick section of the stepped hole is inserted in the positioning hole. A steel ball for blocking the thin section of the stepped hole when the hydraulic oil flows back is provided between the thick section of the stepped hole located between the limit pin and the thin section of the stepped hole. For this one-way valve structure of the hydraulic cylinder, the stepped hole is convenient to machine and the precision requirement is reduced. Only a steel ball and a limit pin are added on the basis of the original oil cylinder. The structure is simple. Both the steel ball and the limit pin are standard parts, with low manufacturing cost, short production cycle, and simple and fast installation.

[0004] In the above-mentioned prior art, the steel ball structure is used in cooperation with the stepped hole. The matching degree between the spherical surface of the steel ball and the stepped hole is not good, resulting in oil leakage, thus affecting the function of the one-way valve, losing its overload protection function in the rotary oil cylinder, and unable to ensure the normal operation of other integrated modules. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the prior art, and a one-way valve structure inside an oil cylinder is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A one-way valve structure inside an oil cylinder, comprising:

[0008] An oil cylinder, the oil cylinder includes a cylinder barrel and a cylinder bottom installed at one end of the cylinder barrel, and a vertical oil inlet hole is provided in the cylinder bottom;

[0009] One-way valve body, the one-way valve body is installed inside the bottom of the cylinder, a medium channel penetrating the one-way valve body is provided inside the one-way valve body, both ends of the medium channel are communicated with an oil inlet hole and a cylinder barrel respectively, and two groups of one-way valve cores are installed at the head and tail of the medium channel respectively.

[0010] Preferably, both groups of the one-way valve cores include a valve seat and a valve frame fixedly arranged in the medium channel, guide rods distributed in a circumferential array are fixedly connected between the valve seat and the valve frame, a sealing plug which moves along the guide rods and can block the valve seat is arranged between the valve seat and the valve frame, and an elastic element is fixedly arranged on one side of the sealing plug.

[0011] Preferably, a nut is embedded and installed on the valve frame, an adjusting screw rod is in threaded connection with the nut, one end of the adjusting screw rod is rotatably connected with an adjusting plate, and one end of the elastic element far away from the sealing plug is connected with the adjusting plate.

[0012] Preferably, the inner ring of the valve seat is arranged in a three-level step shape, and the sealing plug is successively cylindrical, conical and stepped from the side in contact with the elastic element.

[0013] Preferably, notches are formed in the outer ring of the sealing plug and the adjusting plate, and the guide rods are clamped in the notches.

[0014] Preferably, the sealing plug is a component made of polytetrafluoroethylene material.

[0015] Preferably, a cylinder head is installed at one end of the cylinder barrel far away from the bottom of the cylinder, a piston body is arranged inside the cylinder barrel, a piston rod is connected to one end of the piston body far away from the bottom of the cylinder, the other end of the piston rod penetrates through the cylinder head to reach the outside of the cylinder barrel, and the bottom of the cylinder is connected with the cylinder barrel through bolts.

[0016] Preferably, a sealing cavity is formed at one end of the cylinder barrel close to the bottom of the cylinder, a sealing ring is fixedly connected to the one-way valve body, the sealing ring is clamped in the sealing cavity, the sealing ring is an integrally formed structure of a cone and a circle, and the shape of the sealing cavity is adapted to the shape of the sealing ring.

[0017] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0018] 1. In the present utility model, through the cooperation of the adjusting screw rod and the nut, the distance between the adjusting plate and the valve seat is adjusted, the pre-tightening force of the elastic element is changed, and thus the opening pressure of the one-way valve body is adjusted, which can meet the use requirements under different working conditions.

[0019] 2. In the present utility model, when the oil cylinder retracts, the sealing plug closely cooperates with the valve seat under the action of the oil pressure and the elastic force of the elastic element, achieving a good sealing effect, effectively preventing the oil from flowing from the one-way valve body into the oil inlet hole, ensuring the normal operation of other integrated modules, avoiding system failures caused by oil backflow, replacing the existing method of the steel ball cooperating with the stepped hole, and solving the problem of oil leakage in the steel ball one-way valve.

[0020] 3. In the present utility model, two groups of one-way valve cores are adopted. Even if one of the valve cores is damaged, the other valve core can still continue to work, ensuring the continuity and stability of the oil cylinder system and improving the service life.

[0021] 4. In the present utility model, the cylinder bottom and the cylinder barrel are connected by bolts, and together with the sealing ring and the sealing cavity, a sealing effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional structure schematic diagram of a one-way valve structure in an oil cylinder proposed by the present utility model;

[0023] Figure 2 is a partial sectional three-dimensional structure schematic diagram of a one-way valve structure in an oil cylinder proposed by the present utility model;

[0024] Figure 3 is a one-way valve structure in an oil cylinder proposed by the present utility model Figure 2 magnified structure schematic diagram at A;

[0025] Figure 4 is an exploded structure schematic diagram of the one-way valve core of a one-way valve structure in an oil cylinder proposed by the present utility model;

[0026] Figure 5 is another perspective schematic diagram of the exploded structure of the one-way valve core of a one-way valve structure in an oil cylinder proposed by the present utility model.

[0027] LEGEND DESCRIPTION: 100, oil cylinder; 101, cylinder barrel; 102, cylinder bottom; 103, oil inlet hole; 104, cylinder head; 105, piston body; 106, piston rod; 107, sealing cavity; 200, one-way valve body; 201, medium channel; 202, one-way valve core; 2021, valve seat; 2022, valve frame; 2023, guide rod; 2024, sealing plug; 2025, elastic element; 2026, nut; 2027, adjusting screw; 2028, adjusting plate; 2029, notch; 203, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To better understand the above-mentioned objects, features, and advantages of the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0029] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0030] As Figures 1-5 shown, the present utility model provides a one-way valve structure inside an oil cylinder, including:

[0031] An oil cylinder 100, the oil cylinder 100 includes a cylinder barrel 101 and a cylinder bottom 102 installed at one end of the cylinder barrel 101, and a vertical oil inlet hole 103 is provided in the cylinder bottom 102;

[0032] A one-way valve body 200, the one-way valve body 200 is installed inside the cylinder bottom 102, a medium channel 201 penetrating the one-way valve body 200 is provided in the one-way valve body 200, both ends of the medium channel 201 are respectively communicated with the oil inlet hole 103 and the cylinder barrel 101, and two groups of one-way valve cores 202 are respectively installed at the head and tail of the medium channel 201.

[0033] In this embodiment, both groups of one-way valve cores 202 include a valve seat 2021 and a valve frame 2022 fixedly arranged in the medium channel 201. Guide rods 2023 distributed in a circumferential array are fixedly connected between the valve seat 2021 and the valve frame 2022. A sealing plug 2024 that moves along the guide rods 2023 and can block the valve seat 2021 is arranged between the valve seat 2021 and the valve frame 2022, and an elastic element 2025 is fixedly arranged on one side of the sealing plug 2024.

[0034] In this embodiment, a nut 2026 is embedded and installed on the valve frame 2022, an adjusting screw 2027 is threadedly connected inside the nut 2026, one end of the adjusting screw 2027 is rotatably connected with an adjusting plate 2028, and the end of the elastic element 2025 away from the sealing plug 2024 is connected to the adjusting plate 2028; in the early stage of installation, by rotating the adjusting screw 2027 and moving with the cooperation of the nut 2026, the adjusting plate 2028 is pushed, the distance between the adjusting plate 2028 and the valve seat 2021 changes, the pre-tightening force of the elastic element 2025 is adjusted, and thus the opening pressure of the one-way valve body is adjusted.

[0035] In this embodiment, the inner ring of the valve seat 2021 is arranged in a three-level stepped shape, and the sealing plug 2024 is cylindrical, conical and stepped in sequence from the side in contact with the elastic element 2025; through the shape settings of the valve seat 2021 and the sealing plug 2024, the sealing plug 2024 and the valve seat 2021 are in multi-point contact, forming multiple contact surfaces, and each contact surface plays a sealing role, making the overall sealing effect better.

[0036] In this embodiment, notches 2029 are provided on both the outer ring of the sealing plug 2024 and the adjusting plate 2028, and the guide rod 2023 is engaged in the notch 2029; both the sealing plug 2024 and the adjusting plate 2028 can move along the guide rod 2023 through the notch 2029, making the movement of the sealing plug 2024 more stable, so that the overall force on the sealing plug 2024 during operation is also stable and will not vibrate, and thus the wear of the sealing body is small and the service life is long.

[0037] In this embodiment, the sealing plug 2024 is a component made of polytetrafluoroethylene material; it has excellent chemical stability, corrosion resistance, sealing performance, high lubricity and non-stickiness, electrical insulation and good anti-aging endurance, and is resistant to high temperatures.

[0038] In this embodiment, a cylinder head 104 is installed at one end of the cylinder barrel 101 away from the cylinder bottom 102. A piston body 105 is arranged in the cylinder barrel 101. One end of the piston body 105 away from the cylinder bottom 102 is connected to a piston rod 106. The other end of the piston rod 106 passes through the cylinder head 104 to the outside of the cylinder barrel 101, and the cylinder bottom 102 is connected to the cylinder barrel 101 by bolts.

[0039] In this embodiment, a sealing cavity 107 is provided at one end of the cylinder barrel 101 close to the cylinder bottom 102. A sealing ring 203 is fixedly connected to the one-way valve body 200, and the sealing ring 203 is engaged in the sealing cavity 107. The sealing ring 203 is an integrally formed structure of a cone and a circle, and the shape of the sealing cavity 107 is adapted to the shape of the sealing ring 203; when the cylinder bottom 102 is installed, the sealing ring 203 on the cylinder bottom 102 will be stuck into the sealing cavity 107, and due to the special shape settings of the two, the sealing effect is better.

[0040] Usage method and working principle of this device:

[0041] When the device is in use, first, in the early stage of installation, the adjusting screw 2027 is rotated and moves in cooperation with the nut 2026, thereby pushing the adjusting plate 2028. The distance between the adjusting plate 2028 and the valve seat 2021 changes, adjusting the pre-tightening force of the elastic element 2025, and then adjusting the opening pressure of the one-way valve body.

[0042] Secondly, connect the cylinder bottom 102 to the cylinder barrel 101 through bolts. The sealing ring 203 on the cylinder bottom 102 will be stuck into the sealing cavity 107. Due to the special shape settings of the two, the sealing effect is better.

[0043] After installation, when the oil cylinder 100 starts, the oil fluid flows from the oil inlet hole 103 to the medium passage 201 on the one-way valve body 200. The oil fluid pressure acts on the sealing plug 2024, causing the sealing plug 2024 to move along the fluid flow direction. The elastic element 2025 is compressed, and the mating relationship between the sealing plug 2024 and the valve seat 2021 is separated. The oil fluid enters the space where the elastic element 2025 is located, and the oil fluid enters the inner cavity of the cylinder barrel 101 through the valve frame 2022. Here, two groups of one-way valve cores 202 are provided. When one of the one-way valve cores 202 is damaged, it can still be used continuously through the other one-way valve core 202, improving the service life.

[0044] When the oil cylinder 100 retracts, the oil fluid enters the medium passage 201 on the one-way valve body 200 from the inner cavity of the cylinder barrel 101. The oil fluid pressure and the elastic force of the elastic element 2025 act on the sealing plug 2024, causing the sealing plug 2024 to cooperate with the valve seat 2021 to achieve a sealing effect and prevent the oil fluid from flowing from the one-way valve body 200 into the oil inlet hole 103, ensuring the normal operation of other integrated modules. It replaces the method of the steel ball cooperating with the stepped hole in the prior art and solves the problem of oil leakage in the steel ball one-way valve. The two groups of one-way valve cores 202 also make the sealing performance better.

[0045] The above are only the preferred embodiments of the present invention, and are not limitations on the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A one-way valve structure in an oil cylinder, characterized in that: include: An oil cylinder (100), the oil cylinder (100) comprising a cylinder barrel (101) and a cylinder bottom (102) mounted at one end of the cylinder barrel (101), wherein a vertical oil inlet hole (103) is arranged in the cylinder bottom (102); A one-way valve body (200) is installed on the inner side of the cylinder bottom (102), a medium channel (201) penetrating the one-way valve body (200) is provided in the one-way valve body (200), two ends of the medium channel (201) are respectively connected to the oil inlet hole (103) and the cylinder barrel (101), and two groups of one-way valve cores (202) are respectively installed at the head and the tail of the medium channel (201).

2. The one-way valve structure in the oil cylinder according to claim 1, characterized in that: The two groups of one-way valve cores (202) each include a valve seat (2021) and a valve frame (2022) fixedly arranged in a medium channel (201); a guide rod (2023) distributed in a circumferential array is fixedly connected between the valve seat (2021) and the valve frame (2022); a sealing plug (2024) is arranged between the valve seat (2021) and the valve frame (2022) and is movable along the guide rod (2023) and is capable of sealing the valve seat (2021); an elastic element (2025) is fixedly arranged on one side of the sealing plug (2024).

3. The one-way valve structure in the oil cylinder according to claim 2, characterized in that: A nut (2026) is embedded and installed on the valve frame (2022), and the nut (2026) is internally threadedly connected to an adjusting screw (2027), one end of the adjusting screw (2027) is rotatably connected to an adjusting plate (2028), and one end of the elastic element (2025) away from the sealing plug (2024) is connected to the adjusting plate (2028).

4. The one-way valve structure in the oil cylinder according to claim 2, characterized in that: The inner ring of the valve seat (2021) is configured to have three steps, and the sealing plug (2024) is configured to have a cylindrical shape, a conical shape, and a step shape, from the side in contact with the elastic element (2025).

5. The one-way valve structure in the oil cylinder according to claim 3, characterized in that: The outer ring of the sealing plug (2024) and the adjustment plate (2028) are both provided with notches (2029), and the guide rod (2023) is engaged in the notches (2029).

6. The one-way valve structure in the oil cylinder according to claim 2, characterized in that: The sealing plug (2024) is a component made of polytetrafluoroethylene material.

7. The one-way valve structure in the oil cylinder according to claim 1, characterized in that: A cylinder cover (104) is installed at one end of the cylinder barrel (101) away from the cylinder bottom (102); a piston body (105) is arranged inside the cylinder barrel (101); one end of the piston body (105) away from the cylinder bottom (102) is connected to a piston rod (106); the other end of the piston rod (106) passes through the cylinder cover (104) to reach the outside of the cylinder barrel (101); and the cylinder bottom (102) is connected to the cylinder barrel (101) by bolts.

8. The one-way valve structure in the oil cylinder according to claim 1, characterized in that: A sealing cavity (107) is provided at one end of the cylinder barrel (101) close to the cylinder bottom (102); a sealing ring (203) is fixedly connected to the one-way valve body (200); the sealing ring (203) is engaged in the sealing cavity (107); the sealing ring (203) is a conical and circular integrally formed structure; the shape of the sealing cavity (107) is adapted to the shape of the sealing ring (203).

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