Flexible connecting pipe assembly and hydraulic system

Abstract

The invention provides a flexible connecting pipe assembly and a hydraulic system. The flexible connecting pipe assembly is used for being connected with two oil ports in a hydraulic system and comprises two connectors, each connector is provided with a first end and a second end which are opposite to each other, the first ends of the two connectors are connected with the two oil ports in a sealed mode respectively, and a first medium channel is formed in each connector; the two ends of the connecting pipe are connected with the second ends of the two connectors respectively, and a second medium channel is formed in the connecting pipe and communicates with the first medium channel; the two ends of the connecting pipe are connected with the second end of the connector in the mode that an end hole is matched with a spherical end, and the sealing mode of the end hole and the spherical end is radial sealing. The invention is used for overcoming the defects of large installation space, high manufacturing process, poor shock resistance and the like of buckling hoses, hard pipes and metal corrugated pipes.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic pipes, and in particular to a flexible connecting pipe assembly and a hydraulic system. Background Art

[0002] In recent years, with the rapid development of the physical industry, the role of hydraulic systems in the development of the physical industry has become increasingly important. As an important component of the hydraulic system, the lubrication and cooling system plays a role in maintaining the normal operation of the mechanical transmission system for a long time. At present, most lubrication and cooling systems use crimped hoses, hard pipes, and metal bellows to transmit working media. The crimped hose requires sufficient space to be installed, has strict requirements on the bending radius of the hose, and has disadvantages such as high price and short life. The hard pipe has high requirements on the manufacturing process, and cannot be installed if there is a slight error, and has poor vibration resistance. The metal bellows has low pressure resistance, poor vibration resistance, high price, weak correction ability in a small space, and under conditions of large vibration, micro-wear is easily generated between the bellows body and the outer mesh sleeve, causing the pipe wall to penetrate and leak and fail. Summary of the invention

[0003] The purpose of the present invention is to provide a flexible connecting pipe assembly and a hydraulic system, which are used to overcome the defects of crimping hoses, hard pipes and metal bellows, such as large installation space, high manufacturing process and poor shock resistance.

[0004] In order to achieve the above objectives, the present invention is implemented by the following technical solutions:

[0005] A flexible connecting pipe assembly, used for connecting two oil ports in a hydraulic system, comprises:

[0006] Two joints, each having a first end and a second end opposite to the other, the first ends of the two joints being sealedly connected to the two oil ports respectively, and a first medium channel being provided inside the joint;

[0007] A connecting pipe, two ends of which are respectively connected to the second ends of the two connectors, and a second medium channel is provided in the connecting pipe, which is communicated with the first medium channel;

[0008] The two ends of the connecting pipe and the second end of the joint are connected in the form of matching end holes with spherical end heads, and the sealing method of the end holes and the spherical end heads is radial sealing.

[0009] Optionally, the second end of the joint is provided with an end hole, the two ends of the connecting pipe are spherical surfaces matching the end hole, and the two ends of the connecting pipe are respectively inserted into the end holes of the second ends of the two joints.

[0010] Optionally, end holes are provided at both ends of the connecting pipe, the second end of the joint is a spherical surface matching the end holes, and the second ends of the two joints are respectively inserted into the end holes at both ends of the connecting pipe.

[0011] Optionally, there is a certain gap between the spherical end head and the bottom of the end hole, and the spherical surface of the spherical end head is tangent to the hole wall of the end hole.

[0012] Optionally, a first sealing ring groove is provided at the spherical end head, and a first sealing ring is installed in the first sealing ring groove.

[0013] Optionally, a mid-plane of the first sealing ring groove along the groove width direction passes through the center of the spherical end head.

[0014] Optionally, a second sealing ring groove is provided at the first end of the joint, and a second sealing ring is installed in the second sealing ring groove.

[0015] Optionally, the first end of the connector is connected to the oil port via a fastener, or the first end of the connector is inserted into the oil port and threadedly connected.

[0016] Optionally, the joint and the connecting pipe are made of carbon steel, stainless steel or aluminum alloy.

[0017] A hydraulic system uses the flexible connecting pipe assembly as described above to connect two oil ports.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The flexible connecting pipe assembly provided by the present invention has a simple structure and only needs to develop and manufacture two parts. The seals and fasteners all use standard parts commonly used in the market, and the cost is low. It is easy to manufacture and install, and does not require special equipment, such as a hose assembly crimping machine, a bellows roll forming machine, and a special seam welding machine. Common medium-precision lathes or CNC lathes can meet the processing needs. The process is simple, the processing efficiency is high, and the processing cost is low. It can be used in a variety of working conditions, and the size of the joint, the connecting pipe, and the sealing ring can be changed according to requirements. The oil ports at both ends of the equipment can be different flange forms, threaded forms, or a combination of the two, and oil ports of different sizes and distances can be connected, which is highly practical. Especially in a small space, when conventional hose assemblies, hard pipe assemblies, or metal bellows assemblies are difficult to manufacture and install, the flexible connecting pipe assembly of the present invention has obvious advantages.

[0020] The flexible connecting pipe assembly provided by the present invention has a certain adjustment range in both the axial direction and the radial direction, and is reliable in sealing when using a standard sealing ring. By selecting different materials, the requirements of different working pressure ranges can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are an embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0022] Figure 1 A structural diagram of a flexible connecting pipe provided in the first embodiment of the present invention, wherein a flange joint is used and two oil ports are coaxial;

[0023] Figure 2 A structural diagram of a flexible connecting pipe provided in the second embodiment of the present invention, wherein a flange joint is used and the two oil ports are not coaxial;

[0024] Figure 3 A schematic diagram of a flexible connecting pipe structure provided in the third embodiment of the present invention, wherein a flange joint is used and two oil ports have a spatial angle;

[0025] Figure 4 A structural diagram of a flexible connecting pipe provided in a fourth embodiment of the present invention, wherein a flange joint is adopted and the joint has a spherical surface;

[0026] Figure 5 A structural diagram of a flexible connecting pipe provided for the fifth embodiment of the present invention, wherein a flange joint is adopted and the joint has a spherical surface and two oil ports have a spatial angle;

[0027] Figure 6 A structural diagram of a flexible connecting pipe provided in a sixth embodiment of the present invention, wherein a threaded joint is used and the connecting pipe has a spherical surface;

[0028] Figure 7 A structural diagram of a flexible connecting pipe provided in the seventh embodiment of the present invention, wherein a threaded joint is used and the joint has a spherical surface;

[0029] Figure 8 A structural diagram of a flexible connecting pipe provided for the eighth embodiment of the present invention, wherein a threaded joint is used and the connecting pipe has a spherical surface and two oil ports have a spatial angle;

[0030] Fig. 9 A structural diagram of a flexible connecting pipe provided for the ninth embodiment of the present invention, wherein a threaded joint is adopted and the joint has a spherical surface and two oil ports have a spatial angle.

[0031] The reference numerals in the figure are as follows: 1-joint, 2-second sealing ring, 3-first sealing ring, 4-connecting pipe, 5-fastener, 11-hexagonal nut. DETAILED DESCRIPTION

[0032] The scheme proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the present invention. In order to make the purposes, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the accompanying drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0033] Combination Figures 1 to 9 As shown, an embodiment of the present invention provides a flexible connecting pipe assembly for connecting two oil ports in a hydraulic system (the two oil ports are respectively a medium inlet and a medium outlet). Specifically, the flexible connecting pipe assembly comprises: two connectors 1, the connectors having opposite first and second ends (according to Figure 1 The end of the joint 1 shown in the figure that is connected to the oil port of the equipment is defined as the first end, and the end that is connected to the connecting pipe 4 is defined as the second end). The first ends of the two joints 1 are respectively sealed and connected to the two oil ports, and the joint 1 has a first medium channel; the connecting pipe 4, whose two ends are respectively connected to the second ends of the two joints 1, has a second medium channel in the connecting pipe 4, which is connected to the first medium channel; the two ends of the connecting pipe 4 are connected to the second end of the joint 1 in the form of matching end holes and spherical end heads, and the sealing method of the end holes and the spherical end heads is radial sealing.

[0034] In this embodiment, the first ends of the two joints 1 are respectively sealed and connected to the two oil ports, and a connecting pipe 4 is arranged between the two joints 1. The medium can flow into the first medium channel of one of the joints 1 from one oil port, and then flow out from the first medium channel of the other joint 1 to the other oil port after passing through the second medium channel of the connecting pipe 4.

[0035] In one embodiment, if Figure 1 , 2 As shown in , 3, 6, and 8, the second ends of the two joints 1 are provided with end holes, and the two ends of the connecting tube 4 are spherical end caps matching the end holes, and the two ends of the connecting tube 4 are respectively inserted into the end holes of the second ends of the two joints 1. In another embodiment, as Figure 4 , 5As shown in , 7 and 9, end holes are provided at both ends of the connecting tube 4, the second ends of the two joints 1 are spherical ends matching the end holes, and the second ends of the two joints 1 are respectively inserted into the end holes at both ends of the connecting tube 4.

[0036] In order to prevent the medium from leaking from the connection between the connecting pipe 4 and the joint 1, the spherical end is provided with a first sealing ring groove at the connection, and the first sealing ring 3 is installed in the first sealing ring groove. Furthermore, the mid-plane of the first sealing ring groove along the groove width direction passes through the center of the spherical end to ensure the sealing effect. Figure 1 , 2 As shown in , 3, 6, and 8, the two ends of the connecting pipe 4 are spherical ends, and the first sealing ring grooves are provided at the two ends of the connecting pipe 4. Figure 4 , 5 As shown in , 7 and 9 , the second ends of the two joints 1 are spherical ends, and the first sealing ring groove is arranged at the second ends of the two joints 1 .

[0037] In this embodiment, there is a certain gap between the spherical end head and the bottom of the end hole, which can be used to compensate for the axial distance error between the oil ports at both ends. The spherical surface of the spherical end head is tangent to the hole wall of the end hole, which can be used to adjust the radial error of the eccentricity of the oil ports at both ends.

[0038] The axial distance error of the oil ports at both ends can be adjusted by moving the connecting pipe 4 between the two end joints 1, and the radial error of the oil ports at both ends can be adaptively adjusted by adjusting the relative angle between the connecting pipe 4 and the two end joints 1. Figure 1 As shown, the flexible connecting pipe assembly can meet the application scenarios where the oil ports at both ends are coaxial, such as Figure 2 , 4 As shown in , 6, and 7, the flexible connecting pipe assembly can meet the application scenarios where the oil ports at both ends are not in the same axis, such as Figure 3 , 5 As shown in , 8 and 9, the flexible connecting pipe assembly can meet the application scenarios where there is a spatial angle between the oil ports at both ends.

[0039] like Figure 1 , 2 As shown in , 4, the joint 1 is a flange joint (i.e., the first end of the joint 1 has a flange structure), and the first end of the joint 1 is connected to the oil port through a fastener 5. In one embodiment, the fastener 5 may include a flange clamp, a gasket, and a bolt, etc., to fix the joint 1 at the oil port. In other embodiments, the fastener may also adopt other structures, which is not limited by the present invention. Or, Figure 6 , 7As shown in , 8 and 9, the connector 1 is a threaded connector, the outer wall of the first end of the connector 1 and the inner wall of the oil port are provided with matching threads, the first end of the connector 1 is inserted into the oil port, and the two are connected by threads.

[0040] like Figure 1 , 2 As shown in , 3, 4, and 5, the connector 1 is a T-shaped structure, the first end is a cylindrical surface, the end surface is provided with a second sealing ring groove, and the second sealing ring 2 is installed in the second sealing ring groove for sealing between the connector 1 and the oil port. Figure 6 , 7 As shown, the first end of the connector 1 has a shoulder, and the thread extends from the end face of the first end to the shoulder. A second sealing ring groove is provided at the bottom of the thread. The second sealing ring 2 is installed in the second sealing ring groove for sealing between the connector 1 and the oil port. The connector 1 is rotated into the oil port until the shoulder presses the second sealing ring 2 to achieve sealing between the connector 1 and the oil port. Figure 8 , 9 As shown, the first end of the connector 1 also includes a hexagonal nut 11 (in conventional connectors, the connector 1 and the hexagonal nut 11 are regarded as a whole), and the first end of the connector 1 is provided with a second sealing ring groove in the middle of the thread, and the second sealing ring 2 is installed in the second sealing ring groove for sealing between the connector 1 and the oil port. In actual application, after the connector 1 is rotated to a suitable depth and angle of the oil port, the hexagonal nut 11 is rotated to compress the second sealing ring 2, thereby fixing the connector 1, compressing the second sealing ring 2 and achieving the purpose of sealing between the connector 1 and the oil port.

[0041] In this embodiment, the joint 1 and the connecting pipe 4 are made of the same material. Carbon steel, stainless steel or aluminum alloy and other materials can be selected according to the working environment, working medium and anti-corrosion requirements. It has the advantages of high pressure resistance, small deformation, oil resistance, strong corrosion resistance, simple manufacturing, low cost and long service life.

[0042] Based on the same inventive concept, the present invention also provides a hydraulic system, which uses the above-mentioned flexible connecting pipe assembly to connect two oil ports. The two oil ports can be coaxial or non-coaxial, and can also have a spatial angle.

[0043] In summary, the flexible connecting pipe assembly provided by the present invention has a simple structure, and only two parts need to be developed and manufactured. The seals and fasteners use standard parts commonly used in the market, and the cost is low. It is easy to manufacture and install, and no special equipment is required, such as a hose assembly crimping machine, a bellows roll forming machine, and a special seam welding machine. Common medium-precision lathes or CNC lathes can meet the processing needs. The process is simple, the processing efficiency is high, and the processing cost is low. It can be used in a variety of working conditions, and the size of the joint, the connecting pipe and the sealing ring can be changed according to the requirements. The oil ports at both ends of the equipment can be different flange forms, threaded forms, or a combination of the two, and the oil ports of different sizes and distances can be connected, which is highly practical. Especially in the case where the space is small and the conventional hose assembly, hard pipe assembly or metal bellows assembly is difficult to manufacture and install, the flexible connecting pipe of the present invention has obvious advantages. The flexible connecting pipe assembly provided by the present invention has a certain adjustment range in both the axial and radial directions, and the standard sealing ring is used for reliable sealing. Different materials can be selected to meet the needs of different working pressure ranges.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A flexible connecting pipe assembly, characterized in that: For connecting two ports in the hydraulic system, including: Two joints, each having a first end and a second end opposite to the other, the first ends of the two joints being sealedly connected to the two oil ports respectively, and a first medium channel being provided inside the joint; A connecting pipe, two ends of which are respectively connected to the second ends of the two connectors, and a second medium channel is provided in the connecting pipe, which is communicated with the first medium channel; The two ends of the connecting pipe and the second end of the joint are connected in the form of matching end holes with spherical end heads, and the sealing method of the end holes and the spherical end heads is radial sealing.

2. The flexible connecting pipe assembly according to claim 1, characterized in that: The second end of the joint is provided with an end hole, and the two ends of the connecting pipe are spherical surfaces matching the end hole. The two ends of the connecting pipe are respectively inserted into the end holes of the second ends of the two joints.

3. The flexible connecting pipe assembly according to claim 1, characterized in that: End holes are arranged at both ends of the connecting pipe, the second end of the joint is a spherical surface matching the end holes, and the second ends of the two joints are respectively inserted into the end holes at both ends of the connecting pipe.

4. The flexible connecting pipe assembly according to claim 1, characterized in that: There is a certain gap between the spherical end head and the bottom of the end hole, and the spherical surface of the spherical end head is tangent to the hole wall of the end hole.

5. The flexible connecting pipe assembly according to claim 1, characterized in that: A first sealing ring groove is provided at the spherical end, and a first sealing ring is installed in the first sealing ring groove.

6. The flexible connecting pipe assembly according to claim 5, characterized in that: The mid-plane of the first sealing ring groove along the groove width direction passes through the center of the spherical end head.

7. The flexible connecting pipe assembly according to claim 1, characterized in that: A second sealing ring groove is provided at the first end of the joint, and a second sealing ring is installed in the second sealing ring groove.

8. The flexible connecting pipe assembly according to claim 1, characterized in that: The first end of the connector is connected to the oil port via a fastener, or the first end of the connector is inserted into the oil port and threadedly connected.

9. The flexible connecting pipe assembly according to claim 1, characterized in that: The joint and the connecting pipe are made of carbon steel, stainless steel or aluminum alloy.

10. A hydraulic system, characterized in that: The two oil ports are connected by using the flexible connecting pipe assembly as described in any one of claims 1 to 9.

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