Rotary transmission joint

Abstract

The invention discloses a rotary transmission connector, and belongs to the technical field of mechanical elements. The rotary transmission connector comprises a valve element, an outer shell and a bearing assembly, a plurality of annular channels are formed between the valve element and the outer shell, the valve element is provided with element channels communicated with the annular channels, the outer shell is provided with outer shell channels communicated with the annular channels, and the number of the element channels, the number of the outer shell channels and the number of the annular channels are matched. The outer wall of the valve element is provided with a plurality of element step portions, the inner wall of the outer shell is provided with a plurality of outer shell step portions, one element step portion and one outer shell step portion are arranged between every two adjacent annular channels, the axial faces of the element step portions abut against the axial faces of the outer shell step portions, and the bearing assemblies are arranged at the two ends of the valve element. The axial size of the rotary transmission connector is greatly reduced while the sealing requirement during high-pressure working of the annular channel is met, and the problem that a rotary transmission connector in the prior art is not easy to install and use due to the fact that the axial size is too large is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical elements, in particular to a rotary transmission joint. Background Art

[0002] Although the technical solution disclosed in the existing patent application number: 201010555803.5 and name: Rotary three-channel independent transmission joint can realize the transmission of fluids such as water, gas, oil, etc. in a relative rotational motion mechanism without the problem of pipeline entanglement, its structure is that the outer shell is sleeved on the valve core. In order to ensure smooth assembly, it is necessary to make the inner diameter of the outer shell larger than the outer diameter of the valve core during processing, that is, there must be a gap between the outer shell and the valve core, which leads to the fact that at least two axially parallel sealing rings must be arranged between adjacent annular grooves between the outer shell and the valve core to form two seals in order to meet the sealing requirements of the annular channels when working under high pressure. However, if at least two sealing rings are arranged between two adjacent annular channels, there is a problem that the axial size of the rotary transmission joint is too large and it is not easy to install and use. Summary of the invention

[0003] Purpose of the invention: To provide a rotary transmission joint which can reduce the axial dimension and meet the high-pressure working requirements.

[0004] The technical solution of the present invention is as follows: the rotary transmission joint comprises: a valve core, an outer shell sleeved outside the valve core, and a bearing assembly arranged between the valve core and the outer shell.

[0005] A plurality of annular channels are provided between the valve core and the outer shell. The valve core is provided with a core channel communicating with the annular channels. The outer shell is provided with a shell channel communicating with the annular channels. The number of the core channels, shell channels and annular channels matches each other.

[0006] The outer wall of the valve core is provided with a plurality of core step portions, the inner wall of the outer shell is provided with a plurality of shell step portions, a core step portion and a shell step portion are provided between every two adjacent annular channels, the axial surfaces of the core step portion and the shell step portion are abutted against each other, and the annular channel is a channel surrounded by the core step portion and the shell step portion.

[0007] The bearing components are arranged at both ends of the valve core.

[0008] The bearing assembly includes a first ball bearing disposed at one end of the valve core, a second ball bearing disposed at the other end of the valve core, and a stopper disposed at the other end of the valve core; One end of the valve core is provided with a mounting step, the first ball bearing is arranged between the mounting step and the outer shell, and the second ball bearing is arranged between the outer shell and the stopper; The stopper comprises a stopper arranged at the other end of the valve core, and a screw passing through the stopper and connected to the valve core. The resistance between the core step portion and the shell step portion is adjusted by adjusting the distance that the screw is screwed into the valve core.

[0009] In a further embodiment, the outer diameter of the core step portion at one end of the valve core is smaller than the outer diameter of the core step portion at the other end.

[0010] The inner diameter of the outer shell step portion at one end of the outer shell is larger than the inner diameter of the outer shell step portion at the other end, so that the outer shell can be sleeved on the outer side of the valve core.

[0011] In a further embodiment, the bearing assembly further includes a first thrust bearing disposed at one end of the valve core, and a second thrust bearing disposed at the other end of the valve core.

[0012] The first thrust bearing is arranged between the installation step and the first ball bearing, and the second thrust bearing is arranged between the second ball bearing and the stopper, which can ensure the connection strength between the valve core and the outer shell, and ensure the sealing effect of the core step part and the outer shell step part.

[0013] In a further embodiment, a cavity is provided in the valve core, which can further reduce the weight of the rotary transmission joint, increase the installation space, and reduce the difficulty of installing the rotary transmission joint.

[0014] The beneficial effects of the present invention are as follows: the present application does not need to reserve a gap size on the abutting surfaces through the rigid offset of the axial surfaces of the core step portion and the shell step portion. Compared with the prior art which requires a reserved gap size, resulting in a gap between the outer shell and the valve core, and requiring at least two axially parallel matching sealing rings to be arranged in two adjacent annular grooves to form two seals to meet the sealing requirements of the annular grooves when working under high pressure, only a set of step sealing structures needs to be arranged between two adjacent annular channels to meet the sealing requirements of the annular channels when working under high pressure, thereby greatly reducing the axial size of the rotary transmission joint and solving the problem that the axial size of the rotary transmission joint in the prior art is too large and difficult to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall cross-sectional schematic diagram of the present invention.

[0016] Figure 2 yes Figure 1 A partial enlarged schematic diagram in the middle.

[0017] The reference numerals shown in the figure are: valve core 1, outer shell 2, annular channel 3, bearing assembly 4, stopper 5, sealing ring 6, core channel 11, outer shell channel 21, first ball bearing 41, second ball bearing 42, first thrust bearing 43, second thrust bearing 44, baffle 51, screw 52. DETAILED DESCRIPTION

[0018] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0019] The application discloses a rotary transmission joint which can reduce the axial dimension and meet the high-pressure working requirements.

[0020] The rotary transmission joint comprises: a valve core 1 , an outer shell 2 and a bearing assembly 4 .

[0021] The outer shell 2 is sleeved outside the valve core 1 , a plurality of annular channels 3 are opened between the valve core 1 and the outer shell 2 , and a bearing assembly 4 is arranged between the valve core 1 and the outer shell 2 .

[0022] Both ends of the valve core 1 can be processed into a predetermined shape or a mounting hole according to the matching mechanical element. The valve core 1 is provided with a core channel 11 connected with the annular channel 3. The number of the core channel 11 and the annular channel 3 is matched. The outer wall of the valve core 1 is provided with a plurality of core steps. In a further embodiment of the valve core 1, a cavity is provided in the valve core 1, such as Figure 1 The cavity shown is a cross-sectional view of an embodiment of a cylindrical cavity. The cavity may also be a rectangular cavity or a cavity with a polygonal prism structure such as a triangular prism. The shape of the cavity may also be processed into a predetermined shape according to an adaptable mechanical element. By providing a cavity, the weight of the rotary transmission joint can be further reduced, the installable space is increased, and the difficulty of installing the rotary transmission joint is reduced.

[0023] The outer shell 2 is a cylindrical structure with an inner wall, and the outer wall can be processed into a predetermined shape or a mounting hole according to the matching mechanical element, such as Figure 1 The outer wall shown is cylindrical as a whole. The outer shell 2 is provided with an outer shell channel 21 communicating with the annular channel 3. The number of the outer shell channels 21 matches that of the annular channel 3. The inner wall of the outer shell 2 is provided with a plurality of outer shell step portions.

[0024] like Figure 1 The bearing assemblies 4 are arranged at both ends of the valve core 1 .

[0025] The number of the annular channel 3, the core channel 11 and the shell channel 21 can be a one-to-one relationship or a one-to-many relationship, including at least one annular channel 3, and at least two core step portions and shell step portions, such as Figure 1As shown, six annular channels 3 , seven core steps, and seven shell steps are provided, wherein the number of annular channels 3 , core steps, and shell steps can be adjusted as required.

[0026] Working principle: The axial surfaces of the core step and the shell step are rigidly offset, so there is no need to reserve a gap size on the offset surface. Figure 1 As shown, the dimensions of the two annular channels 3 in the axial direction can be connected, and the axial dimension of the rotary transmission joint is fully utilized. Only a set of step sealing structures needs to be arranged between two adjacent annular channels 3 to meet the sealing requirements of the annular channels 3 when working under high pressure, which greatly reduces the axial dimension of the rotary transmission joint.

[0027] exist Figure 1 In a further embodiment in which the core step portion cooperates with the housing step portion, the outer diameter of the core step portion at one end of the valve core 1 is smaller than the outer diameter of the core step portion at the other end.

[0028] The inner diameter of the outer shell step portion at one end of the outer shell body 2 is larger than the inner diameter of the outer shell step portion at the other end.

[0029] By decreasing the outer diameter of the core step from one end to the other end and increasing the inner diameter of the shell step from one end to the other end, it is possible to avoid the core step at the other end of the valve core 1 blocking the shell step at one end of the shell 2 when the shell 2 is sleeved on the outside of the valve core 1, so that the shell 2 can be sleeved on the outside of the valve core 1.

[0030] exist Figure 2 In a further embodiment in which the core step portion cooperates with the shell step portion, the rotary transmission joint further comprises: a sealing ring 6 disposed between the core step portion and the shell step portion.

[0031] A mounting groove is provided between the core step portion and the shell step portion, and a sealing ring 6 is arranged in the mounting groove. Figure 2 The mounting groove shown is arranged at the end of the core step portion. In other embodiments, the mounting groove may be arranged at the end of the shell step portion.

[0032] The sealing ring 6 can ensure the sealing effect when the surface accuracy of the core step portion and the shell step portion is low, thereby achieving the function of compensating the processing accuracy, so that the core step portion and the shell step portion can be processed with lower accuracy, and the certain existing gaps in the prior art are changed into probabilistic gaps after low-precision processing. The sealing ring 6 is used to compensate for the defects of low processing accuracy, thereby reducing the processing costs of the core step portion and the shell step portion while ensuring the sealing effect.

[0033] Furthermore, by arranging the sealing ring 6 in the installation groove, the sealing ring 6 does not occupy the axial dimension of the rotary transmission joint.

[0034] In this embodiment, the sealing ring is a graphite sealing ring.

[0035] By utilizing the advantages of good self-lubricity of the graphite sealing ring, small friction between the sealing ring and the moving parts, and the wear resistance and high temperature resistance of the graphite sealing ring, the service life of the sealing ring can be increased and the use and maintenance cost of the device can be reduced.

[0036] exist Figure 1 In a further embodiment of the bearing assembly 4 shown, the bearing assembly 4 includes a first ball bearing 41 arranged at one end of the valve core 1, a second ball bearing 42 arranged at the other end of the valve core 1, and a stopper 5 arranged at the other end of the valve core 1.

[0037] An installation step is provided at one end of the valve core 1 . The first ball bearing 41 is provided between the installation step and the outer shell 2 . The second ball bearing 42 is provided between the outer shell 2 and the stopper 5 .

[0038] In this embodiment, the stopper 5 can be a shaft retaining ring clamped on the other end of the valve core 1 or a circular ring-shaped stopper 51 connected to the other end of the valve core 1 through a screw 52 .

[0039] The first ball bearing 41 and the second ball bearing 42 can ensure the coaxiality of the valve core 1 and the outer shell 2, thereby ensuring that the two can rotate relative to each other.

[0040] exist Figure 1 In a further embodiment of the bearing assembly 4 shown, the bearing assembly 4 further includes a first thrust bearing 43 disposed at one end of the valve core 1 , and a second thrust bearing 44 disposed at the other end of the valve core 1 .

[0041] The stopper 5 includes a stopper 51 disposed at the other end of the valve core 1 , and a screw 52 passing through the stopper 51 and connected to the valve core 1 .

[0042] The first thrust bearing 43 is arranged between the mounting step and the first ball bearing 41, and the second thrust bearing 44 is arranged between the second ball bearing 42 and the stopper 5. The thrust bearing can improve the axial precision of the valve core 1 and the outer shell 2, and can ensure the connection strength of the valve core 1 and the outer shell 2 when the high-pressure fluid is passed into the annular channel 3, and ensure the sealing effect of the core step portion and the outer shell step portion.

[0043] In this embodiment, the rotary transmission joint includes: S1. The first thrust bearing 43, the first ball bearing 41, the outer shell 2, the second ball bearing 42 and the second thrust bearing 44 are sequentially sleeved on the valve core 1. When combined with the sealing ring 6 embodiment, the sealing ring 6 needs to be sleeved on the valve core 1 before the outer shell 2.

[0044] S2. The screw 52 passes through the baffle 51 and is connected to the valve core 1 , and the baffle 51 is abutted against the second thrust bearing 44 .

[0045] S3. Fluid is introduced into the annular channel 3 to test the sealing performance between the valve body and the outer shell 2. Meanwhile, the valve core 1 and the outer shell 2 are rotated relative to each other to test whether the rotation resistance meets the working requirements.

[0046] When the sealing performance of the valve body and the outer shell 2 meets the requirements and the rotation resistance is less than the resistance threshold, it is determined that the rotary transmission joint is assembled qualified and the valve body and the outer shell 2 are qualified parts.

[0047] When the sealing performance of the valve body and the outer shell 2 meets the requirements and the rotation resistance is greater than or equal to the resistance threshold, the screw 52 is moved away from the valve core 1, so that the sealing performance of the valve body and the outer shell 2 meets the requirements and the rotation resistance is less than the resistance threshold. At this time, it is determined that the rotary transmission joint is assembled properly and the valve body and the outer shell 2 are qualified parts; When the rotational resistance is less than the resistance threshold, and the sealing performance of the valve body and the outer shell 2 does not meet the requirements, the screw 52 is moved toward the valve core 1, so that the sealing performance of the valve body and the outer shell 2 meets the requirements and the rotational resistance is less than the resistance threshold. At this time, it is determined that the rotary transmission joint is assembled properly, and the valve body and the outer shell 2 are qualified parts. When the rotation resistance after adjusting the screw 52 is less than, equal to or greater than the resistance threshold, and the sealing performance of the valve body and the outer shell 2 does not meet the requirements, it is determined that the rotary transmission joint is unqualified in assembly, and the valve body and the outer shell 2 are unqualified parts.

[0048] By adjusting the distance that the screw 52 is screwed into the valve core 1, the resistance force between the core step portion and the outer shell step portion can also be adjusted. While ensuring the sealing effect of the core step portion and the outer shell step portion, it is ensured that the valve core 1 and the outer shell 2 can rotate relative to each other, and it is also convenient to check whether the processing of the valve body and the outer shell 2 is qualified.

[0049] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A rotary transmission joint, characterized in that: The rotary transmission joint comprises: a valve core, an outer shell sleeved outside the valve core, and a bearing assembly arranged between the valve core and the outer shell; A plurality of annular channels are provided between the valve core and the outer shell, the valve core is provided with a core channel communicating with the annular channels, the outer shell is provided with a shell channel communicating with the annular channels, and the number of the core channels, shell channels and annular channels is matched; The outer wall of the valve core is provided with a plurality of core steps, the inner wall of the outer shell is provided with a plurality of outer shell steps, a core step and an outer shell step are provided between every two adjacent annular channels, the axial surfaces of the core step and the outer shell step are against each other, and the annular channel is a channel surrounded by the core step and the outer shell step; The bearing assemblies are arranged at both ends of the valve core; The bearing assembly includes a first ball bearing disposed at one end of the valve core, a second ball bearing disposed at the other end of the valve core, and a stopper disposed at the other end of the valve core; One end of the valve core is provided with a mounting step, the first ball bearing is arranged between the mounting step and the outer shell, and the second ball bearing is arranged between the outer shell and the stopper; The stopper comprises a stopper arranged at the other end of the valve core, and a screw passing through the stopper and connected to the valve core. The resistance between the core step portion and the shell step portion is adjusted by adjusting the distance that the screw is screwed into the valve core.

2. The rotary transmission joint according to claim 1, characterized in that: The outer diameter of the core step portion at one end of the valve core is smaller than the outer diameter of the core step portion at the other end; The inner diameter of the outer shell step portion at one end of the outer shell is larger than the inner diameter of the outer shell step portion at the other end.

3. The rotary transmission joint according to claim 1, characterized in that: The bearing assembly further comprises a first thrust bearing arranged at one end of the valve core, and a second thrust bearing arranged at the other end of the valve core; The first thrust bearing is arranged between the mounting step and the first ball bearing, and the second thrust bearing is arranged between the second ball bearing and the stopper.

4. The rotary transmission joint according to claim 1, characterized in that: A cavity is provided in the valve core.

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