A pressure relief valve

Abstract

The utility model relates to a kind of pressure relief valves, wherein pressure relief valve includes body, the body includes flange part and stem part, the flange part and the stem part are connected and set, the diameter of the flange part is greater than the diameter of the stem part, the stem part is provided with outer thread;The body has the valve hole being set through the flange part and the stem part;The stem part is used for being screwed in the outer oil cylinder, and the flange part is used for abutting on the outer wall surface of the outer oil cylinder;Elastic component, the initial size of the elastic component is greater than the inner diameter of the valve hole, the elastic component is installed in the valve hole, the elastic component is fixed with the valve hole by the friction force generated by elastic deformation, so that the valve hole is sealed.The utility model can be installed by extruding elastic component to the valve hole of body, convenient to install, and body itself is easy to process.

Description

Technical Field

[0001] This utility model relates to a hydraulic damper, and more particularly to a pressure relief valve. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] In automated equipment, linear motion machinery is generally equipped with hydraulic dampers. Taking elevators as an example, hydraulic dampers are used to protect the elevator from direct impacts from external components when it reaches a preset point during operation. Specifically, they buffer the elevator at one end, allowing it to smoothly reach the preset point.

[0004] During the installation of existing hydraulic shock absorbers, operators need to fill them with the appropriate amount of hydraulic oil according to the actual site requirements. However, in some cases, due to improper operation or changes in the equipment, the amount of hydraulic oil in the shock absorber may not meet the needs. Especially in cases of excessive hydraulic oil filling, the piston stroke of the shock absorber becomes shorter, leading to a sudden increase in internal pressure under impact and causing structural damage. Therefore, some existing hydraulic shock absorbers, to address these situations and for safety reasons, require an additional cavity to hold the hydraulic oil. However, this results in an excessively large shock absorber, increasing costs.

[0005] In some existing technologies, a pressure relief valve is installed on the outer cylinder of the hydraulic buffer to allow the high-pressure oil to be ejected, which indirectly reduces the size of the cylinder. However, the existing pressure relief valves are difficult to install and not easy to process.

[0006] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0007] The purpose of this invention is to provide a pressure relief valve that can be installed by squeezing an elastic component into the valve hole of the main body, which is convenient to install and the main body itself is easy to process.

[0008] To achieve the above objectives, this utility model discloses a pressure relief valve, wherein the hydraulic damper includes an outer cylinder, an inner cylinder, and a piston assembly. The outer cylinder is sleeved outside the inner cylinder, and the inner cylinder is provided with a throttling orifice. The end of the piston assembly passes through the outer cylinder and is installed in the inner cylinder, and the end of the piston assembly is used to move within the inner cylinder. The pressure relief valve includes:

[0009] The body includes a flange and a rod, which are connected together. The diameter of the flange is larger than the diameter of the rod, and the rod is provided with external threads. The body has a valve hole that passes through the flange and the rod. The rod is threaded into the outer cylinder, and the flange is used to abut against the outer wall of the outer cylinder.

[0010] An elastic component, the initial size of which is larger than the inner diameter of the valve orifice, is installed in the valve orifice. The elastic component is fixed to the valve orifice by means of the friction generated by elastic deformation, so that the valve orifice is sealed.

[0011] As a further description of the above technical solution, the body has a mounting hole at one end of the valve hole facing the flange, the inner diameter of the mounting hole is larger than the inner diameter of the valve hole, and the mounting hole is connected to the valve hole.

[0012] As a further description of the above technical solution, the mounting hole is configured as an internal hexagonal structure.

[0013] As a further description of the above technical solution, an annular inclined surface is provided between the mounting hole and the valve hole, and the inner diameter of the annular inclined surface gradually increases from the valve hole to the mounting hole.

[0014] As a further description of the above technical solution, the initial shape of the elastic component is set as a sphere, and the elastic component installed in the valve hole is in contact with the inner wall surface of the valve hole.

[0015] As a further description of the above technical solution, the elastic component is made of rubber.

[0016] As a further description of the above technical solution, the diameter of the elastic component is smaller than the length of the valve hole, so that the elastic component has a gap at the front and back in the valve hole.

[0017] This utility model also provides a hydraulic damper, which includes a hydraulic cylinder, an inner hydraulic cylinder, and a piston assembly. The outer hydraulic cylinder is sleeved outside the inner hydraulic cylinder. The inner hydraulic cylinder is provided with a throttling orifice. The end of the piston assembly passes through the outer hydraulic cylinder and is installed in the inner hydraulic cylinder. The end of the piston assembly is used to move in the inner hydraulic cylinder. The outer hydraulic cylinder of the hydraulic damper is equipped with a pressure relief valve as described above, and there are multiple pressure relief valves.

[0018] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0019] The pressure relief valve of this invention can be easily installed by pressing an elastic component into the valve hole of the main body, and the main body itself is easy to manufacture. Specifically, during installation, the main body of the pressure relief valve can be pre-installed as a fastener on the outer cylinder, and then the elastic component can be directly inserted into the valve hole of the main body. Since the size of the elastic component is larger than the inner diameter of the valve hole, the pressed elastic component can be firmly fixed in the valve hole by friction, thus achieving closure of the valve hole. After releasing the oil pressure and ejecting the elastic component, the elastic component of the pressure relief valve can still be quickly reinstalled from the outside of the valve, significantly reducing maintenance costs. In this embodiment, the main body itself can be manufactured by a mature process using ordinary bolt fasteners through perforation, reducing costs.

[0020] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings provided are for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of a pressure relief valve provided in the embodiments of this specification;

[0023] Figure 2 This is a schematic diagram illustrating a usage scenario of a pressure relief valve provided in the embodiments of this specification;

[0024] In the picture:

[0025] 1. External hydraulic cylinder;

[0026] 2. Internal hydraulic cylinder; 21. Throttling orifice;

[0027] 3. Piston assembly;

[0028] 4. Body; 41. Flange; 42. Stem; 43. External thread; 44. Valve hole; 45. Mounting hole; 46. Annular bevel;

[0029] 5. Elastic components. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustration only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0032] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0033] Please see Figure 1-2 This embodiment provides a pressure relief valve for installation on a hydraulic buffer. The hydraulic buffer includes an outer cylinder 1, an inner cylinder 2, and a piston assembly 3. The outer cylinder 1 is sleeved outside the inner cylinder 2. The inner cylinder has a throttling orifice 21. The end of the piston assembly 3 passes through the outer cylinder 1 and is installed in the inner cylinder 2. The end of the piston assembly 3 is used to move within the inner cylinder 2. The pressure relief valve includes:

[0034] The body 4 includes a flange 41 and a rod 42, which are connected together. The diameter of the flange 41 is larger than the diameter of the rod 42, and the rod 42 is provided with an external thread 43. The body 4 has a valve hole 44 that passes through the flange 41 and the rod 42. The rod 42 is threaded 43 and installed in the outer cylinder 1, and the flange 41 is used to abut against the outer wall of the outer cylinder 1.

[0035] The elastic component 5 has an initial size larger than the inner diameter of the valve hole 44. The elastic component 5 is installed in the valve hole 44 and is fixed to the valve hole 44 by means of the friction generated by the elastic deformation, so that the valve hole 44 is sealed.

[0036] by Figure 2 For example, the hydraulic buffer contains hydraulic oil. Before use, the operator only needs to fill the inner cylinder 2 with a preset amount of hydraulic oil and then tightly fit the end of the piston assembly 3 into the inner cylinder 2, preventing the hydraulic oil from flowing out of the inner cylinder 2 towards the piston assembly 3. During use, the other end of the piston assembly 3 is subjected to force and flows towards... Figure 2 As the piston moves downward, the end piston structure at the bottom of the piston assembly 3 exerts downward pressure on the hydraulic oil in the inner cylinder 2. The hydraulic oil provides stable resistance to the piston assembly 2. At the same time, some of the hydraulic oil flows from the throttle hole 21 of the inner cylinder 2 to the outer cylinder 1. The piston assembly 3 continues to move downward until the force at the top of the piston assembly 3 weakens or disappears. The piston assembly 3 is then reset by means of the return spring in the piston assembly 3. One end of the return spring abuts against the top of the outer cylinder, and the other end abuts against the bottom side of the top of the piston assembly 3.

[0037] In extreme cases, when the piston assembly 3 is subjected to a large force at its top, the hydraulic oil level in the outer cylinder 1 becomes too high, even filling it completely. In this situation, some of the hydraulic oil may flow to... Figure 1 The pressure relief valve rod 42 is inserted into the valve hole 44, and outward pressure is applied to the elastic member 5 in the valve hole 44. At this time, the friction between the elastic member 5 and the inner wall of the valve hole 44 is insufficient to cope with the pressure of the hydraulic oil. The elastic member 5 and the valve hole 44 are in motion and friction. The elastic member 5 is pushed towards the flange 41 until the elastic member 5 is finally ejected. The hydraulic oil can also be ejected from the body 4, and the oil pressure is released, avoiding damage to the structure caused by excessive oil pressure.

[0038] After resetting, the valve hole 44 in the body 4 can be cleaned, and then the elastic component 5 can be reinstalled into the valve hole 44 to reset the sealing function of the pressure relief valve.

[0039] The method described above for pressing the elastic component 5 into the valve hole 44 of the main body 4 is convenient to install, and the main body 4 itself is easy to process. Specifically, in the installation of the pressure relief valve of this utility model, the main body 4 of the main body can be directly installed on the outer oil cylinder 1 as a fastener in advance, and then the elastic component 5 can be directly inserted into the valve hole 44 of the main body 4. Since the size of the elastic component 5 is larger than the inner diameter of the valve hole 44, the pressed elastic component 5 can be firmly fixed in the valve hole 44 by friction, thus achieving the closure of the valve hole 44 before and after. After releasing the oil pressure and ejecting the elastic component 5, the elastic component 5 of the pressure relief valve can still be quickly reinstalled from the outside of the pressure relief valve, significantly reducing maintenance costs. In this embodiment, the main body 1 itself can be manufactured by a mature process using ordinary bolt fasteners through perforation, reducing costs.

[0040] In the above structure, the rod portion 42 of the body 4 is slightly longer than the flange portion 41, thus allowing the valve hole 44 to have a certain travel space for the elastic component 5 to slide. This prevents the elastic component 5 from being directly ejected by accidental, brief, non-destructive impacts, which would affect maintenance efficiency and increase maintenance burden. In this embodiment, the length of the rod portion 42 is approximately 1-2 times that of the flange portion 41.

[0041] The body 4 has a mounting hole 45 at the end of the valve hole 44 facing the flange 41. The inner diameter of the mounting hole 45 is larger than the inner diameter of the valve hole 44, and the mounting hole 45 communicates with the valve hole 44. The mounting hole 45 is located on the outer side, while the valve hole 44 is located on the inner side. Therefore, the mounting hole 45 can serve as a guide hole for installing the elastic member 5 into the valve hole. It has a larger diameter, making it easier for the operator to insert the elastic member 5 into the mounting hole 45. Since the mounting hole 45 communicates with the valve hole 44, which is ultimately used to position the elastic member 5, only a certain amount of additional pressure is needed to squeeze the elastic member 5 from the mounting hole 45 into the valve hole 44. Compared to a structure with only the valve hole 44, it is easier to install the elastic member 5.

[0042] In another embodiment, based on the above-mentioned mounting hole 45 structure, the mounting hole 45 is set as an internal hexagon structure. Therefore, the pressure relief valve can also function as a fixing fastener, which can assist in the stability of the external cylinder 1 structure and directly assist in the installation of the internal hexagon fastener.

[0043] Please see Figure 1An annular inclined surface 46 is provided between the mounting hole 45 and the valve hole 44. The inner diameter of the annular inclined surface 46 gradually increases from the valve hole 44 to the mounting hole 45. The annular inclined surface 46 actually serves as a transition guide surface between the mounting hole 45 and the valve hole 44. Its purpose is to facilitate the installation of the elastic component 5 in the embodiment described above, where "applying additional pressure allows the elastic component 5 to be squeezed from the mounting hole 45 into the valve hole 44, making the installation of the elastic component 5 easier compared to a structure with only the valve hole 44." By utilizing the annular inclined surface 46, the installation process experiences less resistance and is easier to install stably and evenly in the valve hole 44 compared to a right-angle connection.

[0044] Furthermore, the initial shape of the elastic component 5 is set as a sphere, and the elastic component 5 installed in the valve hole 44 contacts the inner wall surface of the valve hole 44. Specifically, in this embodiment, the elastic component 5 is set as an elastic rubber ball with a diameter of approximately 1.5 of the valve hole 44, which can produce the following after compression: Figure 1 The surface that is in annular contact with the valve hole 44, as shown, has greater frictional resistance and is therefore more stable.

[0045] In another embodiment, the diameter of the elastic member 5 is smaller than the length of the valve hole 44, so that there is a gap between the elastic member 5 and the valve hole 44. That is, in this embodiment, the elastic member 5 can move at least a certain distance in the valve hole 44 when subjected to external force, so as to avoid the elastic member 5 detaching from the valve hole 44 due to a short but ineffective hydraulic shock, which would increase the maintenance workload.

[0046] This utility model also protects a hydraulic damper, which includes a hydraulic cylinder 1, an inner hydraulic cylinder 2, and a piston assembly 3. The outer hydraulic cylinder 1 is sleeved outside the inner hydraulic cylinder 2. The inner hydraulic cylinder 2 is provided with a throttling orifice 21. The end of the piston assembly 3 passes through the outer hydraulic cylinder 1 and is installed in the inner hydraulic cylinder 2. The end of the piston assembly 3 is used to move in the inner hydraulic cylinder 2. The outer hydraulic cylinder 1 of the hydraulic damper is equipped with a pressure relief valve as described in the above embodiment. There are multiple pressure relief valves, so the release of hydraulic oil in the outer hydraulic cylinder 1 can be more uniform and stable.

[0047] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

[0048] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0049] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A pressure relief valve for mounting on a hydraulic damper, wherein, The hydraulic damper includes an outer cylinder, an inner cylinder, and a piston assembly. The outer cylinder is sleeved outside the inner cylinder. The inner cylinder has a throttling orifice. The end of the piston assembly passes through the outer cylinder and is installed in the inner cylinder. The end of the piston assembly is used to move within the inner cylinder. The pressure relief valve includes: The body includes a flange and a rod, which are connected together. The diameter of the flange is larger than the diameter of the rod, and the rod is provided with external threads. The body has a valve hole that passes through the flange and the rod. The rod is threaded into the outer cylinder, and the flange is used to abut against the outer wall of the outer cylinder. An elastic component, the initial size of which is larger than the inner diameter of the valve orifice, is installed in the valve orifice. The elastic component is fixed to the valve orifice by means of the friction generated by elastic deformation, so that the valve orifice is sealed.

2. The pressure relief valve according to claim 1, characterized in that: The body has a mounting hole at one end of the valve hole facing the flange, the inner diameter of the mounting hole is larger than the inner diameter of the valve hole, and the mounting hole is connected to the valve hole.

3. The pressure relief valve according to claim 2, characterized in that: The mounting holes are configured with an internal hexagonal structure.

4. The pressure relief valve according to claim 2, characterized in that: An annular inclined surface is provided between the mounting hole and the valve hole, and the inner diameter of the annular inclined surface gradually increases from the valve hole to the mounting hole.

5. The pressure relief valve according to claim 1, characterized in that: The elastic component is initially shaped as a sphere, and the elastic component installed in the valve hole is in contact with the inner wall surface of the valve hole.

6. The pressure relief valve according to claim 1, characterized in that: The elastic component is made of rubber.

7. The pressure relief valve according to claim 1, characterized in that: The diameter of the elastic component is smaller than the length of the valve hole, so that there is a gap between the front and back of the elastic component in the valve hole.

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